diff --git a/utils/yangutils/plugin/pom.xml b/utils/yangutils/plugin/pom.xml
new file mode 100644
index 0000000..4a6ade8
--- /dev/null
+++ b/utils/yangutils/plugin/pom.xml
@@ -0,0 +1,224 @@
+<!--
+  ~ Copyright 2016-present Open Networking Laboratory
+  ~
+  ~ Licensed under the Apache License, Version 2.0 (the "License");
+  ~ you may not use this file except in compliance with the License.
+  ~ You may obtain a copy of the License at
+  ~
+  ~     http://www.apache.org/licenses/LICENSE-2.0
+  ~
+  ~ Unless required by applicable law or agreed to in writing, software
+  ~ distributed under the License is distributed on an "AS IS" BASIS,
+  ~ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+  ~ See the License for the specific language governing permissions and
+  ~ limitations under the License.
+  -->
+<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
+    xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
+    <modelVersion>4.0.0</modelVersion>
+
+    <parent>
+        <groupId>org.onosproject</groupId>
+        <artifactId>onos-yangutils</artifactId>
+        <version>1.7.0-SNAPSHOT</version>
+        <relativePath>../pom.xml</relativePath>
+    </parent>
+
+    <artifactId>yangutils-maven-plugin</artifactId>
+    <version>1.0.0-SNAPSHOT</version>
+    <name>onos-yang-utils-plugin</name>
+    <packaging>maven-plugin</packaging>
+
+    <properties>
+        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
+    </properties>
+
+    <dependencies>
+         <dependency>
+            <groupId>org.onosproject</groupId>
+            <artifactId>yangutils-datamodel</artifactId>
+            <version>1.7.0-SNAPSHOT</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-core</artifactId>
+            <version>3.3.9</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-plugin-api</artifactId>
+            <version>3.3.9</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven.plugin-tools</groupId>
+            <artifactId>maven-plugin-annotations</artifactId>
+            <version>3.4</version>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.felix</groupId>
+            <artifactId>maven-scr-plugin</artifactId>
+            <version>1.21.0</version>
+            <scope>compile</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-artifact</artifactId>
+            <version>3.3.9</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-project</artifactId>
+            <version>3.0-alpha-2</version>
+        </dependency>
+        <dependency>
+            <groupId>org.apache.maven</groupId>
+            <artifactId>maven-model</artifactId>
+            <version>3.3.9</version>
+        </dependency>
+        <dependency>
+            <groupId>junit</groupId>
+            <artifactId>junit</artifactId>
+            <version>4.12</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.sonatype.plexus</groupId>
+            <artifactId>plexus-build-api</artifactId>
+            <version>0.0.7</version>
+            <scope>provided</scope>
+        </dependency>
+        <dependency>
+            <groupId>commons-io</groupId>
+            <artifactId>commons-io</artifactId>
+            <version>2.4</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.hamcrest</groupId>
+            <artifactId>hamcrest-all</artifactId>
+            <version>1.3</version>
+        </dependency>
+
+        <dependency>
+            <groupId>org.onosproject</groupId>
+            <artifactId>onlab-junit</artifactId>
+            <version>1.7.0-SNAPSHOT</version>
+            <scope>test</scope>
+        </dependency>
+        <dependency>
+            <groupId>org.antlr</groupId>
+            <artifactId>antlr4-runtime</artifactId>
+            <version>4.5.3</version>
+        </dependency>
+        <dependency>
+            <groupId>org.codehaus.mojo</groupId>
+            <artifactId>build-helper-maven-plugin</artifactId>
+            <version>1.10</version>
+        </dependency>
+    </dependencies>
+
+    <build>
+        <plugins>
+            <plugin>
+                <groupId>org.antlr</groupId>
+                <artifactId>antlr4-maven-plugin</artifactId>
+                <version>4.5</version>
+                <executions>
+                    <execution>
+                        <phase>generate-sources</phase>
+                        <goals>
+                            <goal>antlr4</goal>
+                        </goals>
+                    </execution>
+                </executions>
+                <configuration>
+                    <sourceDirectory>src/main/resources</sourceDirectory>
+                    <outputDirectory>target/generated-sources/org/onosproject/yangutils/parser/antlrgencode</outputDirectory>
+                    <visitor>false</visitor>
+                    <listener>true</listener>
+                </configuration>
+            </plugin>
+            <plugin>
+                <artifactId>maven-clean-plugin</artifactId>
+                <version>3.0.0</version>
+                <executions>
+                    <execution>
+                        <id>Deleting auto-generated listener interfaces</id>
+                        <phase>generate-sources</phase>
+                        <goals>
+                            <goal>clean</goal>
+                        </goals>
+                    </execution>
+                </executions>
+                <configuration>
+                    <excludeDefaultDirectories>true</excludeDefaultDirectories>
+                    <filesets>
+                        <fileset>
+                            <directory>target</directory>
+                            <followSymlinks>false</followSymlinks>
+                            <useDefaultExcludes>true</useDefaultExcludes>
+                            <excludes>
+                                <exclude>**/generated-sources/org/onosproject/yangutils/parser/antlrgencode/GeneratedYangLexer.java</exclude>
+                                <exclude>**/generated-sources/org/onosproject/yangutils/parser/antlrgencode/GeneratedYang.tokens</exclude>
+                                <exclude>**/generated-sources/org/onosproject/yangutils/parser/antlrgencode/GeneratedYangParser.java</exclude>
+                                <exclude>**/generated-sources/org/onosproject/yangutils/parser/antlrgencode/GeneratedYangLexer.tokens</exclude>
+                                <exclude>**/generated-sources/org/onosproject/yangutils/parser/antlrgencode/YangLexer.java</exclude>
+                                <exclude>**/generated-sources/org/onosproject/yangutils/parser/antlrgencode/YangLexer.tokens</exclude>
+                            </excludes>
+                        </fileset>
+                    </filesets>
+                    <verbose>true</verbose>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.codehaus.mojo</groupId>
+                <artifactId>build-helper-maven-plugin</artifactId>
+                <version>1.10</version>
+                <executions>
+                    <execution>
+                        <id>add-source</id>
+                        <phase>generate-sources</phase>
+                        <goals>
+                            <goal>add-source</goal>
+                        </goals>
+                        <configuration>
+                            <sources>
+                                <source>target/generated-sources/org/onosproject/yangutils/parser/antlrgencode</source>
+                            </sources>
+                        </configuration>
+                    </execution>
+                </executions>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.felix</groupId>
+                <artifactId>maven-bundle-plugin</artifactId>
+                <extensions>true</extensions>
+                <configuration>
+                    <instructions>
+                        <Export-Package>
+                            org.onosproject.yangutils.parser.*
+                        </Export-Package>
+                    </instructions>
+                </configuration>
+            </plugin>
+            <plugin>
+                <groupId>org.apache.maven.plugins</groupId>
+                <artifactId>maven-plugin-plugin</artifactId>
+                <version>3.4</version>
+                <configuration>
+                    <skipErrorNoDescriptorsFound>true</skipErrorNoDescriptorsFound>
+                </configuration>
+                <executions>
+                    <execution>
+                        <phase>generate-sources</phase>
+                        <goals>
+                            <goal>descriptor</goal>
+                        </goals>
+                    </execution>
+                </executions>
+            </plugin>
+        </plugins>
+    </build>
+
+</project>
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/linker/YangLinker.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/linker/YangLinker.java
new file mode 100644
index 0000000..bbb673a
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/linker/YangLinker.java
@@ -0,0 +1,34 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+package org.onosproject.yangutils.linker;
+
+import java.util.Set;
+import org.onosproject.yangutils.plugin.manager.YangFileInfo;
+
+/**
+ * Abstraction of entity which provides linking service of YANG files.
+ */
+public interface YangLinker {
+
+    /**
+     * Resolve the import and include dependencies for a given resolution
+     * information.
+     *
+     * @param yangFileInfoSet set of all dependent YANG files
+     */
+    void resolveDependencies(Set<YangFileInfo> yangFileInfoSet);
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/linker/YangLinkingPhase.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/linker/YangLinkingPhase.java
new file mode 100644
index 0000000..23020df
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/linker/YangLinkingPhase.java
@@ -0,0 +1,34 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.linker;
+
+/**
+ * Represents the phase of YANG file reference linking.
+ */
+public enum YangLinkingPhase {
+
+    /**
+     * Linking the reference within the files.
+     */
+    INTRA_FILE,
+
+    /**
+     * Linking the reference across the files.
+     */
+    INTER_FILE
+
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/linker/exceptions/LinkerException.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/linker/exceptions/LinkerException.java
new file mode 100644
index 0000000..755b5b4
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/linker/exceptions/LinkerException.java
@@ -0,0 +1,117 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.linker.exceptions;
+
+/**
+ * Represents base class for exceptions in linker operations.
+ */
+public class LinkerException extends RuntimeException {
+
+    private static final long serialVersionUID = 20160211L;
+    private int lineNumber;
+    private int charPositionInLine;
+    private String fileName;
+
+    /**
+     * Creates a new linker exception.
+     */
+    public LinkerException() {
+        super();
+    }
+
+    /**
+     * Creates a new linker exception with given message.
+     *
+     * @param message the detail of exception in string
+     */
+    public LinkerException(String message) {
+        super(message);
+    }
+
+    /**
+     * Creates a new linker exception from given message and cause.
+     *
+     * @param message the detail of exception in string
+     * @param cause   underlying cause of the error
+     */
+    public LinkerException(final String message, final Throwable cause) {
+        super(message, cause);
+    }
+
+    /**
+     * Creates a new linker exception from cause.
+     *
+     * @param cause underlying cause of the error
+     */
+    public LinkerException(final Throwable cause) {
+        super(cause);
+    }
+
+    /**
+     * Returns line number of the exception.
+     *
+     * @return line number of the exception
+     */
+    public int getLineNumber() {
+        return this.lineNumber;
+    }
+
+    /**
+     * Returns YANG file name of the exception.
+     *
+     * @return YANG file name of the exception
+     */
+    public String getFileName() {
+        return this.fileName;
+    }
+
+    /**
+     * Returns position of the exception.
+     *
+     * @return position of the exception
+     */
+    public int getCharPositionInLine() {
+        return this.charPositionInLine;
+    }
+
+    /**
+     * Sets line number of YANG file.
+     *
+     * @param line line number of YANG file
+     */
+    public void setLine(int line) {
+        this.lineNumber = line;
+    }
+
+    /**
+     * Sets position of exception.
+     *
+     * @param charPosition position of exception
+     */
+    public void setCharPosition(int charPosition) {
+        this.charPositionInLine = charPosition;
+    }
+
+    /**
+     * Sets file name in parser exception.
+     *
+     * @param fileName YANG file name
+     */
+    public void setFileName(String fileName) {
+        this.fileName = fileName;
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/linker/exceptions/package-info.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/linker/exceptions/package-info.java
new file mode 100644
index 0000000..42cf3a2
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/linker/exceptions/package-info.java
@@ -0,0 +1,20 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+/**
+ * Custom linker exceptions.
+ */
+package org.onosproject.yangutils.linker.exceptions;
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/linker/impl/YangEntityToResolveInfoImpl.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/linker/impl/YangEntityToResolveInfoImpl.java
new file mode 100644
index 0000000..6b6be58
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/linker/impl/YangEntityToResolveInfoImpl.java
@@ -0,0 +1,84 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.yangutils.linker.impl;
+
+import java.io.Serializable;
+
+import org.onosproject.yangutils.datamodel.YangEntityToResolveInfo;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangType;
+import org.onosproject.yangutils.datamodel.YangUses;
+import org.onosproject.yangutils.linker.exceptions.LinkerException;
+
+/**
+ * Represents implementation of information about entity being resolved.
+ *
+ * @param <T> type of entity being resolved, uses / grouping
+ */
+public class YangEntityToResolveInfoImpl<T> implements YangEntityToResolveInfo<T>, Serializable {
+
+    private static final long serialVersionUID = 806201659L;
+
+    // Parsable node for which resolution is to be performed.
+    private T entityToResolve;
+
+    // Holder of the YANG construct for which resolution has to be carried out.
+    private YangNode holderOfEntityToResolve;
+
+    @Override
+    public T getEntityToResolve() {
+        return entityToResolve;
+    }
+
+    @Override
+    public void setEntityToResolve(T entityToResolve) {
+        this.entityToResolve = entityToResolve;
+    }
+
+    @Override
+    public YangNode getHolderOfEntityToResolve() {
+        return holderOfEntityToResolve;
+    }
+
+    @Override
+    public void setHolderOfEntityToResolve(YangNode holderOfEntityToResolve) {
+        this.holderOfEntityToResolve = holderOfEntityToResolve;
+    }
+
+    /**
+     * Retrieves the prefix of the entity.
+     *
+     * @return entities prefix
+     * @throws LinkerException linker error
+     */
+    public String getEntityPrefix()
+            throws LinkerException {
+        if (getEntityToResolve() == null) {
+            return null;
+        }
+
+        String prefix;
+        T entityToBeResolved = getEntityToResolve();
+        if (entityToBeResolved instanceof YangType) {
+            prefix = ((YangType<?>) entityToBeResolved).getPrefix();
+        } else if (entityToBeResolved instanceof YangUses) {
+            prefix = ((YangUses) entityToBeResolved).getPrefix();
+        } else {
+            throw new LinkerException("Linker Exception: Entity to resolved is other than type/uses");
+        }
+        return prefix;
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/linker/impl/YangLinkerManager.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/linker/impl/YangLinkerManager.java
new file mode 100644
index 0000000..4e8a60a
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/linker/impl/YangLinkerManager.java
@@ -0,0 +1,172 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+package org.onosproject.yangutils.linker.impl;
+
+import java.util.HashSet;
+import java.util.Set;
+import org.onosproject.yangutils.datamodel.ResolvableType;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangReferenceResolver;
+import org.onosproject.yangutils.datamodel.YangSubModule;
+import org.onosproject.yangutils.datamodel.exceptions.DataModelException;
+import org.onosproject.yangutils.linker.YangLinker;
+import org.onosproject.yangutils.linker.exceptions.LinkerException;
+import org.onosproject.yangutils.plugin.manager.YangFileInfo;
+
+import static org.onosproject.yangutils.utils.UtilConstants.NEW_LINE;
+
+/**
+ * Representation of entity which provides linking service of YANG files.
+ */
+public class YangLinkerManager
+        implements YangLinker {
+
+    /*
+     * Set of all the YANG nodes, corresponding to the YANG files parsed by
+     * parser.
+     */
+    Set<YangNode> yangNodeSet = new HashSet<>();
+
+    /**
+     * Returns set of YANG node.
+     *
+     * @return set of YANG node
+     */
+    public Set<YangNode> getYangNodeSet() {
+        return yangNodeSet;
+    }
+
+    /**
+     * Creates YANG nodes set.
+     *
+     * @param yangFileInfoSet YANG file information set
+     */
+    public void createYangNodeSet(Set<YangFileInfo> yangFileInfoSet) {
+        for (YangFileInfo yangFileInfo : yangFileInfoSet) {
+            getYangNodeSet().add(yangFileInfo.getRootNode());
+        }
+    }
+
+    @Override
+    public void resolveDependencies(Set<YangFileInfo> yangFileInfoSet) {
+
+        // Create YANG node set.
+        createYangNodeSet(yangFileInfoSet);
+
+        // Carry out linking of sub module with module.
+        linkSubModulesToParentModule(yangFileInfoSet);
+
+        // Add references to import list.
+        addRefToYangFilesImportList(yangFileInfoSet);
+
+        // Add reference to include list.
+        addRefToYangFilesIncludeList(yangFileInfoSet);
+
+        // TODO check for circular import/include.
+
+        // Carry out inter-file linking.
+        processInterFileLinking(yangFileInfoSet);
+    }
+
+    /**
+     * Resolves sub-module linking by linking sub module with parent module.
+     *
+     * @param yangFileInfoSet set of YANG files info
+     * @throws LinkerException fails to link sub-module to parent module
+     */
+    public void linkSubModulesToParentModule(Set<YangFileInfo> yangFileInfoSet)
+            throws LinkerException {
+        for (YangFileInfo yangFileInfo : yangFileInfoSet) {
+            YangNode yangNode = yangFileInfo.getRootNode();
+            if (yangNode instanceof YangSubModule) {
+                try {
+                    ((YangSubModule) yangNode).linkWithModule(getYangNodeSet());
+                } catch (DataModelException e) {
+                    String errorInfo = "YANG file error: " + yangFileInfo.getYangFileName() + " at line: "
+                            + e.getLineNumber() + " at position: " + e.getCharPositionInLine() + NEW_LINE
+                            + e.getMessage();
+                    throw new LinkerException(errorInfo);
+                }
+            }
+        }
+    }
+
+    /**
+     * Adds imported node information to the import list.
+     *
+     * @param yangFileInfoSet set of YANG files info
+     * @throws LinkerException fails to find imported module
+     */
+    public void addRefToYangFilesImportList(Set<YangFileInfo> yangFileInfoSet) throws LinkerException {
+        for (YangFileInfo yangFileInfo : yangFileInfoSet) {
+            YangNode yangNode = yangFileInfo.getRootNode();
+            if (yangNode instanceof YangReferenceResolver) {
+                try {
+                    ((YangReferenceResolver) yangNode).addReferencesToImportList(getYangNodeSet());
+                } catch (DataModelException e) {
+                    String errorInfo = "Error in file: " + yangFileInfo.getYangFileName() + " at line: "
+                            + e.getLineNumber() + " at position: " + e.getCharPositionInLine() + NEW_LINE
+                            + e.getMessage();
+                    throw new LinkerException(errorInfo);
+                }
+            }
+        }
+    }
+
+    /**
+     * Adds included node information to the include list.
+     *
+     * @param yangFileInfoSet set of YANG files info
+     * @throws LinkerException fails to find included sub-module
+     */
+    public void addRefToYangFilesIncludeList(Set<YangFileInfo> yangFileInfoSet) throws LinkerException {
+        for (YangFileInfo yangFileInfo : yangFileInfoSet) {
+            YangNode yangNode = yangFileInfo.getRootNode();
+            if (yangNode instanceof YangReferenceResolver) {
+                try {
+                    ((YangReferenceResolver) yangNode).addReferencesToIncludeList(getYangNodeSet());
+                } catch (DataModelException e) {
+                    String errorInfo = "Error in file: " + yangFileInfo.getYangFileName() + " at line: "
+                            + e.getLineNumber() + " at position: " + e.getCharPositionInLine() + NEW_LINE
+                            + e.getMessage();
+                    throw new LinkerException(errorInfo);
+                }
+            }
+        }
+    }
+
+    /**
+     * Processes inter file linking for type and uses.
+     *
+     * @param yangFileInfoSet set of YANG files info
+     * @throws LinkerException a violation in linker execution
+     */
+    public void processInterFileLinking(Set<YangFileInfo> yangFileInfoSet)
+            throws LinkerException {
+        for (YangFileInfo yangFileInfo : yangFileInfoSet) {
+            try {
+                ((YangReferenceResolver) yangFileInfo.getRootNode()).resolveInterFileLinking(ResolvableType.YANG_USES);
+                ((YangReferenceResolver) yangFileInfo.getRootNode())
+                        .resolveInterFileLinking(ResolvableType.YANG_DERIVED_DATA_TYPE);
+            } catch (DataModelException e) {
+                String errorInfo = "Error in file: " + yangFileInfo.getYangFileName() + " at line: "
+                        + e.getLineNumber() + " at position: " + e.getCharPositionInLine() + NEW_LINE + e.getMessage();
+                throw new LinkerException(errorInfo);
+            }
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/linker/impl/YangResolutionInfoImpl.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/linker/impl/YangResolutionInfoImpl.java
new file mode 100644
index 0000000..2a710dc
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/linker/impl/YangResolutionInfoImpl.java
@@ -0,0 +1,863 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.linker.impl;
+
+import java.io.Serializable;
+import java.util.Stack;
+
+import org.onosproject.yangutils.datamodel.Resolvable;
+import org.onosproject.yangutils.datamodel.YangDataTypes;
+import org.onosproject.yangutils.datamodel.YangDerivedInfo;
+import org.onosproject.yangutils.datamodel.YangGrouping;
+import org.onosproject.yangutils.datamodel.YangImport;
+import org.onosproject.yangutils.datamodel.YangInclude;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangReferenceResolver;
+import org.onosproject.yangutils.datamodel.YangResolutionInfo;
+import org.onosproject.yangutils.datamodel.YangType;
+import org.onosproject.yangutils.datamodel.YangTypeDef;
+import org.onosproject.yangutils.datamodel.YangUses;
+import org.onosproject.yangutils.datamodel.exceptions.DataModelException;
+import org.onosproject.yangutils.datamodel.utils.ResolvableStatus;
+import org.onosproject.yangutils.linker.YangLinkingPhase;
+
+import static org.onosproject.yangutils.datamodel.utils.ResolvableStatus.INTER_FILE_LINKED;
+import static org.onosproject.yangutils.datamodel.utils.ResolvableStatus.INTRA_FILE_RESOLVED;
+import static org.onosproject.yangutils.datamodel.utils.ResolvableStatus.LINKED;
+import static org.onosproject.yangutils.datamodel.utils.ResolvableStatus.RESOLVED;
+import static org.onosproject.yangutils.datamodel.utils.ResolvableStatus.UNRESOLVED;
+import static org.onosproject.yangutils.linker.YangLinkingPhase.INTER_FILE;
+import static org.onosproject.yangutils.linker.YangLinkingPhase.INTRA_FILE;
+import static org.onosproject.yangutils.utils.UtilConstants.GROUPING_LINKER_ERROR;
+import static org.onosproject.yangutils.utils.UtilConstants.TYPEDEF_LINKER_ERROR;
+
+/**
+ * Represents implementation of resolution object which will be resolved by
+ * linker.
+ *
+ * @param <T> type of resolution entity uses / type
+ */
+public class YangResolutionInfoImpl<T>
+        implements YangResolutionInfo<T>, Serializable {
+
+    private static final long serialVersionUID = 806201658L;
+
+    /**
+     * Information about the entity that needs to be resolved.
+     */
+    private YangEntityToResolveInfoImpl<T> entityToResolveInfo;
+
+    /**
+     * Error line number.
+     */
+    private  transient int lineNumber;
+
+    /**
+     * Error character position in number.
+     */
+    private transient int charPosition;
+
+    /**
+     * Current module/sub-module reference, will be used in inter-file/
+     * inter-jar scenario to get the import/include list.
+     */
+    private transient YangReferenceResolver curReferenceResolver;
+
+    /**
+     * Stack for type/uses is maintained for hierarchical references, this is
+     * used during resolution.
+     */
+    private Stack<YangEntityToResolveInfoImpl<T>> partialResolvedStack;
+
+    /**
+     * It is private to ensure the overloaded method be invoked to create an
+     * object.
+     */
+    @SuppressWarnings("unused")
+    private YangResolutionInfoImpl() {
+
+    }
+
+    /**
+     * Creates a resolution information object with all the inputs.
+     *
+     * @param dataNode           current parsable data node
+     * @param holderNode         parent YANG node
+     * @param lineNumber         error line number
+     * @param charPositionInLine error character position in line
+     */
+    public YangResolutionInfoImpl(T dataNode, YangNode holderNode, int lineNumber, int charPositionInLine) {
+        setEntityToResolveInfo(new YangEntityToResolveInfoImpl<>());
+        getEntityToResolveInfo().setEntityToResolve(dataNode);
+        getEntityToResolveInfo().setHolderOfEntityToResolve(holderNode);
+        this.setLineNumber(lineNumber);
+        this.setCharPosition(charPositionInLine);
+        setPartialResolvedStack(new Stack<>());
+    }
+
+    @Override
+    public void resolveLinkingForResolutionInfo(YangReferenceResolver dataModelRootNode)
+            throws DataModelException {
+
+        setCurReferenceResolver(dataModelRootNode);
+
+        // Current node to resolve, it can be a YANG type or YANG uses.
+        T entityToResolve = getEntityToResolveInfo().getEntityToResolve();
+
+        // Check if linking is already done
+        if (entityToResolve instanceof Resolvable) {
+            Resolvable resolvable = (Resolvable) entityToResolve;
+            if (resolvable.getResolvableStatus() == RESOLVED) {
+                /**
+                 * entity is already resolved, so nothing to do
+                 */
+                return;
+            }
+        } else {
+            throw new DataModelException("Data Model Exception: Entity to resolved is other than type/uses");
+        }
+
+        // Push the initial entity to resolve in stack.
+        addInPartialResolvedStack(getEntityToResolveInfo());
+
+        linkAndResolvePartialResolvedStack();
+    }
+
+    /**
+     * Resolves linking with ancestors.
+     *
+     * @throws DataModelException a violation of data model rules
+     */
+    private void linkAndResolvePartialResolvedStack()
+            throws DataModelException {
+
+        while (getPartialResolvedStack().size() != 0) {
+
+            // Current node to resolve, it can be a YANG type or YANG uses.
+            T entityToResolve = getCurrentEntityToResolveFromStack();
+            // Check if linking is already done
+            if (entityToResolve instanceof Resolvable) {
+
+                Resolvable resolvable = (Resolvable) entityToResolve;
+                switch (resolvable.getResolvableStatus()) {
+                case RESOLVED: {
+                    /*
+                     * If the entity is already resolved in the stack, then pop
+                     * it and continue with the remaining stack elements to
+                     * resolve
+                     */
+                    getPartialResolvedStack().pop();
+                    break;
+                }
+
+                case LINKED: {
+                    /*
+                     * If the top of the stack is already linked then resolve
+                     * the references and pop the entity and continue with
+                     * remaining stack elements to resolve.
+                     */
+                    resolveTopOfStack(INTRA_FILE);
+                    getPartialResolvedStack().pop();
+                    break;
+                }
+
+                case INTRA_FILE_RESOLVED: {
+                    /*
+                     * Pop the top of the stack.
+                     */
+                    getPartialResolvedStack().pop();
+                    break;
+                }
+
+                case UNRESOLVED: {
+                    linkTopOfStackReferenceUpdateStack();
+
+                    if (resolvable.getResolvableStatus() == UNRESOLVED) {
+                        // If current entity is still not resolved, then
+                        // linking/resolution has failed.
+                        String errorInfo;
+                        if (resolvable instanceof YangType) {
+                            errorInfo = TYPEDEF_LINKER_ERROR;
+                        } else {
+                            errorInfo = GROUPING_LINKER_ERROR;
+                        }
+                        DataModelException dataModelException = new DataModelException(errorInfo);
+                        dataModelException.setLine(getLineNumber());
+                        dataModelException.setCharPosition(getCharPosition());
+                        throw dataModelException;
+                    }
+                    break;
+                }
+                default: {
+                    throw new DataModelException("Data Model Exception: Unsupported, linker state");
+                }
+
+                }
+
+            } else {
+                throw new DataModelException("Data Model Exception: Entity to resolved is other than type/uses");
+            }
+
+        }
+
+    }
+
+    /**
+     * Resolves the current entity in the stack.
+     */
+    private void resolveTopOfStack(YangLinkingPhase linkingPhase)
+            throws DataModelException {
+        ((Resolvable) getCurrentEntityToResolveFromStack()).resolve();
+        if (((Resolvable) getCurrentEntityToResolveFromStack()).getResolvableStatus() != INTRA_FILE_RESOLVED) {
+            // Sets the resolution status in inside the type/uses.
+            ((Resolvable) getCurrentEntityToResolveFromStack()).setResolvableStatus(RESOLVED);
+        }
+    }
+
+    /**
+     * Resolves linking for a node child and siblings.
+     *
+     * @throws DataModelException data model error
+     */
+    private void linkTopOfStackReferenceUpdateStack()
+            throws DataModelException {
+
+        /*
+         * Check if self file reference is there, this will not check for the
+         * scenario when prefix is not present and type/uses is present in
+         * sub-module from include list.
+         */
+        if (!isCandidateForSelfFileReference()) {
+            ((Resolvable) getCurrentEntityToResolveFromStack()).setResolvableStatus(INTRA_FILE_RESOLVED);
+            return;
+        }
+
+        /**
+         * Try to resolve the top of the stack and update partial resolved stack
+         * if there is recursive references
+         */
+        YangNode potentialAncestorWithReferredNode = getPartialResolvedStack().peek()
+                .getHolderOfEntityToResolve();
+
+        /**
+         * Traverse up in the ancestor tree to check if the referred node is
+         * defined
+         */
+        while (potentialAncestorWithReferredNode != null) {
+
+            /**
+             * Check for the referred node defined in a ancestor scope
+             */
+            YangNode potentialReferredNode = potentialAncestorWithReferredNode.getChild();
+            if (isReferredNodeInSiblingListProcessed(potentialReferredNode)) {
+                return;
+            }
+
+            potentialAncestorWithReferredNode = potentialAncestorWithReferredNode.getParent();
+        }
+
+        /*
+         * In case prefix is not present it's a candidate for inter-file
+         * resolution via include list.
+         */
+        if (getRefPrefix() == null) {
+            ((Resolvable) getCurrentEntityToResolveFromStack()).setResolvableStatus(INTRA_FILE_RESOLVED);
+        }
+    }
+
+    /**
+     * Checks if the reference in self file or in external file.
+     *
+     * @return true if self file reference, false otherwise
+     * @throws DataModelException a violation of data model rules
+     */
+    private boolean isCandidateForSelfFileReference()
+            throws DataModelException {
+        String prefix = getRefPrefix();
+        return prefix == null || prefix.contentEquals(getCurReferenceResolver().getPrefix());
+    }
+
+    /**
+     * Checks for the referred node defined in a ancestor scope.
+     *
+     * @param potentialReferredNode potential referred node
+     * @return status of resolution and updating the partial resolved stack with
+     * the any recursive references
+     * @throws DataModelException data model errors
+     */
+    private boolean isReferredNodeInSiblingListProcessed(YangNode potentialReferredNode)
+            throws DataModelException {
+        while (potentialReferredNode != null) {
+
+            // Check if the potential referred node is the actual referred node
+            if (isReferredNode(potentialReferredNode)) {
+
+                // Adds reference link of entity to the node under resolution.
+                addReferredEntityLink(potentialReferredNode, LINKED);
+
+                /**
+                 * resolve the reference and update the partial resolution stack
+                 * with any further recursive references
+                 */
+                addUnresolvedRecursiveReferenceToStack(potentialReferredNode);
+
+                /*
+                 * return true, since the reference is linked and any recursive
+                 * unresolved references is added to the stack
+                 */
+                return true;
+            }
+
+            potentialReferredNode = potentialReferredNode.getNextSibling();
+        }
+        return false;
+    }
+
+    /**
+     * Checks if the potential referred node is the actual referred node.
+     *
+     * @param potentialReferredNode typedef/grouping node
+     * @return true if node is of resolve type otherwise false
+     * @throws DataModelException a violation of data model rules
+     */
+    private boolean isReferredNode(YangNode potentialReferredNode)
+            throws DataModelException {
+        if (getCurrentEntityToResolveFromStack() instanceof YangType) {
+            if (potentialReferredNode instanceof YangTypeDef) {
+                /*
+                 * Check if name of node name matches with the entity being
+                 * resolved
+                 */
+                return isNodeNameSameAsResolutionInfoName(potentialReferredNode);
+            }
+        } else if (getCurrentEntityToResolveFromStack() instanceof YangUses) {
+            if (potentialReferredNode instanceof YangGrouping) {
+                /*
+                 * Check if name of node name matches with the entity being
+                 * resolved
+                 */
+                return isNodeNameSameAsResolutionInfoName(potentialReferredNode);
+            }
+        } else {
+            throw new DataModelException("Data Model Exception: Entity to resolved is other than type/uses");
+        }
+        return false;
+    }
+
+    /**
+     * Checks if node name is same as name in resolution info, i.e. name of
+     * typedef/grouping is same as name of type/uses.
+     *
+     * @param node typedef/grouping node
+     * @return true if node name is same as name in resolution info, otherwise
+     * false
+     * @throws DataModelException a violation of data model rules
+     */
+
+    private boolean isNodeNameSameAsResolutionInfoName(YangNode node)
+            throws DataModelException {
+        if (getCurrentEntityToResolveFromStack() instanceof YangType) {
+            if (node.getName().contentEquals(
+                    ((YangType<?>) getCurrentEntityToResolveFromStack())
+                            .getDataTypeName())) {
+                return true;
+            }
+        } else if (getCurrentEntityToResolveFromStack() instanceof YangUses) {
+            if (node.getName().contentEquals(
+                    ((YangUses) getCurrentEntityToResolveFromStack()).getName())) {
+                return true;
+            }
+        } else {
+            throw new DataModelException("Data Model Exception: Entity to resolved is other than type/uses");
+        }
+        return false;
+    }
+
+    /**
+     * Adds reference of grouping/typedef in uses/type.
+     *
+     * @param referredNode grouping/typedef node being referred
+     * @param linkedStatus linked status if success.
+     * @throws DataModelException a violation of data model rules
+     */
+    private void addReferredEntityLink(YangNode referredNode, ResolvableStatus linkedStatus)
+            throws DataModelException {
+        if (getCurrentEntityToResolveFromStack() instanceof YangType) {
+            YangDerivedInfo<?> derivedInfo = (YangDerivedInfo<?>) ((YangType<?>) getCurrentEntityToResolveFromStack())
+                    .getDataTypeExtendedInfo();
+            derivedInfo.setReferredTypeDef((YangTypeDef) referredNode);
+        } else if (getCurrentEntityToResolveFromStack() instanceof YangUses) {
+            ((YangUses) getCurrentEntityToResolveFromStack())
+                    .setRefGroup((YangGrouping) referredNode);
+        } else {
+            throw new DataModelException("Data Model Exception: Entity to resolved is other than type/uses");
+        }
+
+        // Sets the resolution status in inside the type/uses.
+        ((Resolvable) getCurrentEntityToResolveFromStack()).setResolvableStatus(linkedStatus);
+    }
+
+    /**
+     * Checks if type/grouping has further reference to typedef/ unresolved
+     * uses. Add it to the partial resolve stack and return the status of
+     * addition to stack.
+     *
+     * @param referredNode grouping/typedef node
+     * @throws DataModelException a violation of data model rules
+     */
+    private void addUnresolvedRecursiveReferenceToStack(YangNode referredNode)
+            throws DataModelException {
+        if (getCurrentEntityToResolveFromStack() instanceof YangType) {
+            /*
+             * Checks if typedef type is derived
+             */
+            if (((YangTypeDef) referredNode).getTypeDefBaseType().getDataType() == YangDataTypes.DERIVED) {
+
+                YangEntityToResolveInfoImpl<YangType<?>> unResolvedEntityInfo = new YangEntityToResolveInfoImpl<>();
+                unResolvedEntityInfo.setEntityToResolve(((YangTypeDef) referredNode)
+                        .getTypeDefBaseType());
+                unResolvedEntityInfo.setHolderOfEntityToResolve(referredNode);
+                addInPartialResolvedStack((YangEntityToResolveInfoImpl<T>) unResolvedEntityInfo);
+            }
+
+        } else if (getCurrentEntityToResolveFromStack() instanceof YangUses) {
+            /*
+             * Search if the grouping has any un resolved uses child, if so
+             * return true, else return false.
+             */
+            addUnResolvedUsesToStack(referredNode);
+        } else {
+            throw new DataModelException("Data Model Exception: Entity to resolved is other than type/uses");
+        }
+    }
+
+    /**
+     * Returns if there is any unresolved uses in grouping.
+     *
+     * @param node grouping/typedef node
+     */
+    private void addUnResolvedUsesToStack(YangNode node) {
+
+        /**
+         * Search the grouping node's children for presence of uses node.
+         */
+        YangNode curNode = node.getChild();
+        while (curNode != null) {
+            if (curNode instanceof YangUses) {
+                YangEntityToResolveInfoImpl<YangUses> unResolvedEntityInfo = new YangEntityToResolveInfoImpl<>();
+                unResolvedEntityInfo.setEntityToResolve((YangUses) curNode);
+                unResolvedEntityInfo.setHolderOfEntityToResolve(node);
+                addInPartialResolvedStack((YangEntityToResolveInfoImpl<T>) unResolvedEntityInfo);
+
+            }
+            curNode = curNode.getNextSibling();
+        }
+    }
+
+    /**
+     * Returns stack of YANG type with partially resolved YANG construct
+     * hierarchy.
+     *
+     * @return partial resolved YANG construct stack
+     */
+    private Stack<YangEntityToResolveInfoImpl<T>> getPartialResolvedStack() {
+        return partialResolvedStack;
+    }
+
+    /**
+     * Sets stack of YANG type with partially resolved YANG construct hierarchy.
+     *
+     * @param partialResolvedStack partial resolved YANG construct stack
+     */
+    private void setPartialResolvedStack(Stack<YangEntityToResolveInfoImpl<T>> partialResolvedStack) {
+        this.partialResolvedStack = partialResolvedStack;
+    }
+
+    /**
+     * Sets stack of YANG type with partially resolved YANG construct hierarchy.
+     *
+     * @param partialResolvedInfo partial resolved YANG construct stack
+     */
+    private void addInPartialResolvedStack(YangEntityToResolveInfoImpl<T> partialResolvedInfo) {
+        getPartialResolvedStack().push(partialResolvedInfo);
+    }
+
+    /**
+     * Retrieves the next entity in the stack that needs to be resolved. It is
+     * assumed that the caller ensures that the stack is not empty.
+     *
+     * @return next entity in the stack that needs to be resolved
+     */
+    private T getCurrentEntityToResolveFromStack() {
+        return getPartialResolvedStack().peek().getEntityToResolve();
+    }
+
+    @Override
+    public YangEntityToResolveInfoImpl<T> getEntityToResolveInfo() {
+        return entityToResolveInfo;
+    }
+
+    /**
+     * Sets information about the entity that needs to be resolved.
+     *
+     * @param entityToResolveInfo information about the entity that needs to be
+     *                            resolved
+     */
+    private void setEntityToResolveInfo(YangEntityToResolveInfoImpl<T> entityToResolveInfo) {
+        this.entityToResolveInfo = entityToResolveInfo;
+    }
+
+    @Override
+    public int getLineNumber() {
+        return lineNumber;
+    }
+
+    @Override
+    public int getCharPosition() {
+        return charPosition;
+    }
+
+    @Override
+    public void setLineNumber(int lineNumber) {
+        this.lineNumber = lineNumber;
+    }
+
+    @Override
+    public void setCharPosition(int charPositionInLine) {
+        this.charPosition = charPositionInLine;
+    }
+
+    /**
+     * Returns current module/sub-module reference, will be used in inter-file/
+     * inter-jar scenario to get the import/include list.
+     *
+     * @return current module/sub-module reference
+     */
+    private YangReferenceResolver getCurReferenceResolver() {
+        return curReferenceResolver;
+    }
+
+    /**
+     * Sets current module/sub-module reference, will be used in inter-file/
+     * inter-jar scenario to get the import/include list.
+     *
+     * @param curReferenceResolver current module/sub-module reference
+     */
+    private void setCurReferenceResolver(YangReferenceResolver curReferenceResolver) {
+        this.curReferenceResolver = curReferenceResolver;
+    }
+
+    @Override
+    public void linkInterFile(YangReferenceResolver dataModelRootNode)
+            throws DataModelException {
+
+        setCurReferenceResolver(dataModelRootNode);
+
+        // Current node to resolve, it can be a YANG type or YANG uses.
+        T entityToResolve = getEntityToResolveInfo().getEntityToResolve();
+
+        // Check if linking is already done
+        if (entityToResolve instanceof Resolvable) {
+            Resolvable resolvable = (Resolvable) entityToResolve;
+            if (resolvable.getResolvableStatus() == RESOLVED) {
+                return;
+            }
+        } else {
+            throw new DataModelException("Data Model Exception: Entity to resolved is not Resolvable");
+        }
+
+        // Push the initial entity to resolve in stack.
+        addInPartialResolvedStack(getEntityToResolveInfo());
+
+        // Inter file linking and resolution.
+        linkInterFileAndResolve();
+    }
+
+    /**
+     * Returns the referenced prefix of entity under resolution.
+     *
+     * @return referenced prefix of entity under resolution
+     * @throws DataModelException a violation in data model rule
+     */
+    private String getRefPrefix()
+            throws DataModelException {
+        String refPrefix;
+        if (getCurrentEntityToResolveFromStack() instanceof YangType) {
+            refPrefix = ((YangType<?>) getCurrentEntityToResolveFromStack()).getPrefix();
+        } else if (getCurrentEntityToResolveFromStack() instanceof YangUses) {
+            refPrefix = ((YangUses) getCurrentEntityToResolveFromStack()).getPrefix();
+        } else {
+            throw new DataModelException("Data Model Exception: Entity to resolved is other than type/uses");
+        }
+        return refPrefix;
+    }
+
+    /**
+     * Performs inter file linking and resolution.
+     *
+     * @throws DataModelException a violation in data model rule
+     */
+    private void linkInterFileAndResolve()
+            throws DataModelException {
+
+        while (getPartialResolvedStack().size() != 0) {
+
+            // Current node to resolve, it can be a YANG type or YANG uses.
+            T entityToResolve = getCurrentEntityToResolveFromStack();
+            // Check if linking is already done
+            if (entityToResolve instanceof Resolvable) {
+
+                Resolvable resolvable = (Resolvable) entityToResolve;
+                switch (resolvable.getResolvableStatus()) {
+                case RESOLVED: {
+                    /*
+                     * If the entity is already resolved in the stack, then pop
+                     * it and continue with the remaining stack elements to
+                     * resolve
+                     */
+                    getPartialResolvedStack().pop();
+                    break;
+                }
+
+                case INTER_FILE_LINKED: {
+                    /*
+                     * If the top of the stack is already linked then resolve
+                     * the references and pop the entity and continue with
+                     * remaining stack elements to resolve
+                     */
+                    resolveTopOfStack(INTER_FILE);
+                    getPartialResolvedStack().pop();
+                    break;
+                }
+
+                case INTRA_FILE_RESOLVED: {
+                    /*
+                     * If the top of the stack is intra file resolved then check
+                     * if top of stack is linked, if not link it using
+                     * import/include list and push the linked referred entity
+                     * to the stack, otherwise only push it to the stack.
+                     */
+                    linkInterFileTopOfStackRefUpdateStack();
+                    break;
+                }
+
+                default: {
+                    throw new DataModelException("Data Model Exception: Unsupported, linker state");
+                }
+
+                }
+
+            } else {
+                throw new DataModelException("Data Model Exception: Entity to resolved is other than type/uses");
+            }
+
+        }
+
+    }
+
+    /**
+     * Links the top of the stack if it's inter-file and update stack.
+     *
+     * @throws DataModelException data model error
+     */
+    private void linkInterFileTopOfStackRefUpdateStack()
+            throws DataModelException {
+
+        /*
+         * Obtain the referred node of top of stack entity under resolution
+         */
+        T referredNode = getRefNode();
+
+        /*
+         * Check for null for scenario when it's not linked and inter-file
+         * linking is required.
+         */
+        if (referredNode == null) {
+
+            /*
+             * Check if prefix is null or not, to identify whether to search in
+             * import list or include list.
+             */
+            if (getRefPrefix() != null && !getRefPrefix().contentEquals(getCurReferenceResolver().getPrefix())) {
+                if (resolveWithImport()) {
+                    return;
+                }
+            } else {
+                if (resolveWithInclude()) {
+                    return;
+                }
+            }
+            // Exception when referred typedef/grouping is not found.
+            DataModelException dataModelException = new DataModelException("YANG file error: Referred " +
+                    "typedef/grouping for a given type/uses can't be found.");
+            dataModelException.setLine(getLineNumber());
+            dataModelException.setCharPosition(getCharPosition());
+            throw dataModelException;
+        } else {
+            /*
+             * If referred node is already linked, then just change the status
+             * and push to the stack.
+             */
+            ((Resolvable) getCurrentEntityToResolveFromStack()).setResolvableStatus(INTER_FILE_LINKED);
+            addUnresolvedRecursiveReferenceToStack((YangNode) referredNode);
+        }
+    }
+
+    /**
+     * Finds and resolves with include list.
+     *
+     * @return true if resolved, false otherwise
+     * @throws DataModelException a violation in data model rule
+     */
+    private boolean resolveWithInclude()
+            throws DataModelException {
+        /*
+         * Run through all the nodes in include list and search for referred
+         * typedef/grouping at the root level.
+         */
+        for (YangInclude yangInclude : getCurReferenceResolver().getIncludeList()) {
+            YangNode linkedNode = null;
+            if (getCurrentEntityToResolveFromStack() instanceof YangType) {
+                linkedNode = findRefTypedef(yangInclude.getIncludedNode());
+            } else if (getCurrentEntityToResolveFromStack() instanceof YangUses) {
+                linkedNode = findRefGrouping(yangInclude.getIncludedNode());
+            }
+            if (linkedNode != null) {
+                // Add the link to external entity.
+                addReferredEntityLink(linkedNode, INTER_FILE_LINKED);
+                /*
+                 * Update the current reference resolver to external
+                 * module/sub-module containing the referred typedef/grouping.
+                 */
+                setCurReferenceResolver((YangReferenceResolver) yangInclude.getIncludedNode());
+                // Add the type/uses of referred typedef/grouping to the stack.
+                addUnresolvedRecursiveReferenceToStack(linkedNode);
+                return true;
+            }
+        }
+        // If referred node can't be found return false.
+        return false;
+    }
+
+    /**
+     * Finds and resolves with import list.
+     *
+     * @return true if resolved, false otherwise
+     * @throws DataModelException a violation in data model rule
+     */
+    private boolean resolveWithImport()
+            throws DataModelException {
+        /*
+         * Run through import list to find the referred typedef/grouping.
+         */
+        for (YangImport yangImport : getCurReferenceResolver().getImportList()) {
+            /*
+             * Match the prefix attached to entity under resolution with the
+             * imported/included module/sub-module's prefix. If found, search
+             * for the referred typedef/grouping at the root level.
+             */
+            if (yangImport.getPrefixId().contentEquals(getRefPrefix())) {
+                YangNode linkedNode = null;
+                if (getCurrentEntityToResolveFromStack() instanceof YangType) {
+                    linkedNode = findRefTypedef(yangImport.getImportedNode());
+                } else if (getCurrentEntityToResolveFromStack() instanceof YangUses) {
+                    linkedNode = findRefGrouping(yangImport.getImportedNode());
+                }
+                if (linkedNode != null) {
+                    // Add the link to external entity.
+                    addReferredEntityLink(linkedNode, INTER_FILE_LINKED);
+                    /*
+                     * Update the current reference resolver to external
+                     * module/sub-module containing the referred
+                     * typedef/grouping.
+                     */
+                    setCurReferenceResolver((YangReferenceResolver) yangImport.getImportedNode());
+                    // Add the type/uses of referred typedef/grouping to the
+                    // stack.
+                    addUnresolvedRecursiveReferenceToStack(linkedNode);
+                    return true;
+                }
+                /*
+                 * If referred node can't be found at root level break for loop,
+                 * and return false.
+                 */
+                break;
+            }
+        }
+        // If referred node can't be found return false.
+        return false;
+    }
+
+    /**
+     * Returns referred typedef/grouping node.
+     *
+     * @return referred typedef/grouping node
+     * @throws DataModelException a violation in data model rule
+     */
+    private T getRefNode()
+            throws DataModelException {
+        if (getCurrentEntityToResolveFromStack() instanceof YangType) {
+            YangDerivedInfo<?> derivedInfo = (YangDerivedInfo<?>) ((YangType<?>) getCurrentEntityToResolveFromStack())
+                    .getDataTypeExtendedInfo();
+            return (T) derivedInfo.getReferredTypeDef();
+        } else if (getCurrentEntityToResolveFromStack() instanceof YangUses) {
+            return (T) ((YangUses) getCurrentEntityToResolveFromStack()).getRefGroup();
+        } else {
+            throw new DataModelException("Data Model Exception: Entity to resolved is other than type/uses");
+        }
+    }
+
+    /**
+     * Finds the referred grouping node at the root level of imported/included node.
+     *
+     * @param refNode module/sub-module node
+     * @return referred grouping
+     */
+    private YangNode findRefGrouping(YangNode refNode) {
+        YangNode tmpNode = refNode.getChild();
+        while (tmpNode != null) {
+            if (tmpNode instanceof YangGrouping) {
+                if (tmpNode.getName()
+                        .equals(((YangUses) getCurrentEntityToResolveFromStack()).getName())) {
+                    return tmpNode;
+                }
+            }
+            tmpNode = tmpNode.getNextSibling();
+        }
+        return null;
+    }
+
+    /**
+     * Finds the referred typedef node at the root level of imported/included node.
+     *
+     * @param refNode module/sub-module node
+     * @return referred typedef
+     */
+    private YangNode findRefTypedef(YangNode refNode) {
+        YangNode tmpNode = refNode.getChild();
+        while (tmpNode != null) {
+            if (tmpNode instanceof YangTypeDef) {
+                if (tmpNode.getName()
+                        .equals(((YangType) getCurrentEntityToResolveFromStack()).getDataTypeName())) {
+                    return tmpNode;
+                }
+            }
+            tmpNode = tmpNode.getNextSibling();
+        }
+        return null;
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/linker/impl/package-info.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/linker/impl/package-info.java
new file mode 100644
index 0000000..1d38e5a
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/linker/impl/package-info.java
@@ -0,0 +1,20 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Provide intra/inter file and inter jar linking implementation.
+ */
+package org.onosproject.yangutils.linker.impl;
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/linker/package-info.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/linker/package-info.java
new file mode 100644
index 0000000..04ce9d6
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/linker/package-info.java
@@ -0,0 +1,20 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Provide inter jar and inter file linking abstract interface.
+ */
+package org.onosproject.yangutils.linker;
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/YangUtilsParser.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/YangUtilsParser.java
new file mode 100644
index 0000000..ba119f6
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/YangUtilsParser.java
@@ -0,0 +1,38 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser;
+
+import java.io.IOException;
+
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+
+/**
+ * Abstraction of entity which provides parser service of YANG files for yangutils-maven-plugin.
+ */
+public interface YangUtilsParser {
+
+    /**
+     * Returns the data model node. It is an entry function to initiate the YANG file parsing.
+     *
+     * @param file input YANG file
+     * @return YangNode root node of the data model tree
+     * @throws ParserException when fails to get the data model
+     * @throws IOException when there is an exception in IO operation
+     */
+    YangNode getDataModel(String file) throws IOException, ParserException;
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/antlrgencode/GeneratedYangListener.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/antlrgencode/GeneratedYangListener.java
new file mode 100644
index 0000000..c4c52f0
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/antlrgencode/GeneratedYangListener.java
@@ -0,0 +1,1968 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+// Generated from GeneratedYang.g4 by ANTLR 4.5
+
+
+package org.onosproject.yangutils.parser.antlrgencode;
+
+import org.antlr.v4.runtime.tree.ParseTreeListener;
+
+/**
+ * Represents ANTLR interfaces to be implemented by listener to traverse the parse tree.
+ */
+public interface GeneratedYangListener extends ParseTreeListener {
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * yangfile.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterYangfile(GeneratedYangParser.YangfileContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * yangfile.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitYangfile(GeneratedYangParser.YangfileContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * moduleStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterModuleStatement(GeneratedYangParser.ModuleStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * moduleStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitModuleStatement(GeneratedYangParser.ModuleStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * moduleBody.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterModuleBody(GeneratedYangParser.ModuleBodyContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * moduleBody.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitModuleBody(GeneratedYangParser.ModuleBodyContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * moduleHeaderStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterModuleHeaderStatement(GeneratedYangParser.ModuleHeaderStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * moduleHeaderStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitModuleHeaderStatement(GeneratedYangParser.ModuleHeaderStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * linkageStatements.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterLinkageStatements(GeneratedYangParser.LinkageStatementsContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * linkageStatements.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitLinkageStatements(GeneratedYangParser.LinkageStatementsContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * metaStatements.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterMetaStatements(GeneratedYangParser.MetaStatementsContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * metaStatements.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitMetaStatements(GeneratedYangParser.MetaStatementsContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * revisionStatements.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterRevisionStatements(GeneratedYangParser.RevisionStatementsContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * revisionStatements.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitRevisionStatements(GeneratedYangParser.RevisionStatementsContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * bodyStatements.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterBodyStatements(GeneratedYangParser.BodyStatementsContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * bodyStatements.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitBodyStatements(GeneratedYangParser.BodyStatementsContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * yangVersionStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterYangVersionStatement(GeneratedYangParser.YangVersionStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * yangVersionStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitYangVersionStatement(GeneratedYangParser.YangVersionStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * namespaceStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterNamespaceStatement(GeneratedYangParser.NamespaceStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * namespaceStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitNamespaceStatement(GeneratedYangParser.NamespaceStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * prefixStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterPrefixStatement(GeneratedYangParser.PrefixStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * prefixStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitPrefixStatement(GeneratedYangParser.PrefixStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * importStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterImportStatement(GeneratedYangParser.ImportStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * importStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitImportStatement(GeneratedYangParser.ImportStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * importStatementBody.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterImportStatementBody(GeneratedYangParser.ImportStatementBodyContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * importStatementBody.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitImportStatementBody(GeneratedYangParser.ImportStatementBodyContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * revisionDateStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterRevisionDateStatement(GeneratedYangParser.RevisionDateStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * revisionDateStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitRevisionDateStatement(GeneratedYangParser.RevisionDateStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * includeStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterIncludeStatement(GeneratedYangParser.IncludeStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * includeStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitIncludeStatement(GeneratedYangParser.IncludeStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * organizationStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterOrganizationStatement(GeneratedYangParser.OrganizationStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * organizationStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitOrganizationStatement(GeneratedYangParser.OrganizationStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * contactStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterContactStatement(GeneratedYangParser.ContactStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * contactStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitContactStatement(GeneratedYangParser.ContactStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * descriptionStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterDescriptionStatement(GeneratedYangParser.DescriptionStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * descriptionStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitDescriptionStatement(GeneratedYangParser.DescriptionStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * referenceStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterReferenceStatement(GeneratedYangParser.ReferenceStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * referenceStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitReferenceStatement(GeneratedYangParser.ReferenceStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * revisionStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterRevisionStatement(GeneratedYangParser.RevisionStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * revisionStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitRevisionStatement(GeneratedYangParser.RevisionStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * revisionStatementBody.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterRevisionStatementBody(GeneratedYangParser.RevisionStatementBodyContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * revisionStatementBody.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitRevisionStatementBody(GeneratedYangParser.RevisionStatementBodyContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * subModuleStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterSubModuleStatement(GeneratedYangParser.SubModuleStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * subModuleStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitSubModuleStatement(GeneratedYangParser.SubModuleStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * submoduleBody.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterSubmoduleBody(GeneratedYangParser.SubmoduleBodyContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * submoduleBody.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitSubmoduleBody(GeneratedYangParser.SubmoduleBodyContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * submoduleHeaderStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterSubmoduleHeaderStatement(GeneratedYangParser.SubmoduleHeaderStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * submoduleHeaderStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitSubmoduleHeaderStatement(GeneratedYangParser.SubmoduleHeaderStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * belongstoStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterBelongstoStatement(GeneratedYangParser.BelongstoStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * belongstoStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitBelongstoStatement(GeneratedYangParser.BelongstoStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * belongstoStatementBody.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterBelongstoStatementBody(GeneratedYangParser.BelongstoStatementBodyContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * belongstoStatementBody.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitBelongstoStatementBody(GeneratedYangParser.BelongstoStatementBodyContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * extensionStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterExtensionStatement(GeneratedYangParser.ExtensionStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * extensionStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitExtensionStatement(GeneratedYangParser.ExtensionStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * extensionBody.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterExtensionBody(GeneratedYangParser.ExtensionBodyContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * extensionBody.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitExtensionBody(GeneratedYangParser.ExtensionBodyContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * argumentStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterArgumentStatement(GeneratedYangParser.ArgumentStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * argumentStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitArgumentStatement(GeneratedYangParser.ArgumentStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * argumentBody.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterArgumentBody(GeneratedYangParser.ArgumentBodyContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * argumentBody.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitArgumentBody(GeneratedYangParser.ArgumentBodyContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * yinElementStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterYinElementStatement(GeneratedYangParser.YinElementStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * yinElementStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitYinElementStatement(GeneratedYangParser.YinElementStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * identityStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterIdentityStatement(GeneratedYangParser.IdentityStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * identityStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitIdentityStatement(GeneratedYangParser.IdentityStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * identityBody.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterIdentityBody(GeneratedYangParser.IdentityBodyContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * identityBody.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitIdentityBody(GeneratedYangParser.IdentityBodyContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * baseStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterBaseStatement(GeneratedYangParser.BaseStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * baseStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitBaseStatement(GeneratedYangParser.BaseStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * featureStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterFeatureStatement(GeneratedYangParser.FeatureStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * featureStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitFeatureStatement(GeneratedYangParser.FeatureStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * featureBody.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterFeatureBody(GeneratedYangParser.FeatureBodyContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * featureBody.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitFeatureBody(GeneratedYangParser.FeatureBodyContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * dataDefStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterDataDefStatement(GeneratedYangParser.DataDefStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * dataDefStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitDataDefStatement(GeneratedYangParser.DataDefStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * ifFeatureStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterIfFeatureStatement(GeneratedYangParser.IfFeatureStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * ifFeatureStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitIfFeatureStatement(GeneratedYangParser.IfFeatureStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * unitsStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterUnitsStatement(GeneratedYangParser.UnitsStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * unitsStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitUnitsStatement(GeneratedYangParser.UnitsStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * typedefStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterTypedefStatement(GeneratedYangParser.TypedefStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * typedefStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitTypedefStatement(GeneratedYangParser.TypedefStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * typeStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterTypeStatement(GeneratedYangParser.TypeStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * typeStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitTypeStatement(GeneratedYangParser.TypeStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * typeBodyStatements.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterTypeBodyStatements(GeneratedYangParser.TypeBodyStatementsContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * typeBodyStatements.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitTypeBodyStatements(GeneratedYangParser.TypeBodyStatementsContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * numericalRestrictions.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterDecimal64Specification(GeneratedYangParser.Decimal64SpecificationContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * numericalRestrictions.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitDecimal64Specification(GeneratedYangParser.Decimal64SpecificationContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * numericalRestrictions.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterNumericalRestrictions(GeneratedYangParser.NumericalRestrictionsContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * numericalRestrictions.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitNumericalRestrictions(GeneratedYangParser.NumericalRestrictionsContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * rangeStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterRangeStatement(GeneratedYangParser.RangeStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * rangeStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitRangeStatement(GeneratedYangParser.RangeStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * commonStatements.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterCommonStatements(GeneratedYangParser.CommonStatementsContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * commonStatements.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitCommonStatements(GeneratedYangParser.CommonStatementsContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * stringRestrictions.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterStringRestrictions(GeneratedYangParser.StringRestrictionsContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * stringRestrictions.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitStringRestrictions(GeneratedYangParser.StringRestrictionsContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * lengthStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterLengthStatement(GeneratedYangParser.LengthStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * lengthStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitLengthStatement(GeneratedYangParser.LengthStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * patternStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterPatternStatement(GeneratedYangParser.PatternStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * patternStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitPatternStatement(GeneratedYangParser.PatternStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * defaultStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterDefaultStatement(GeneratedYangParser.DefaultStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * defaultStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitDefaultStatement(GeneratedYangParser.DefaultStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * enumSpecification.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterEnumSpecification(GeneratedYangParser.EnumSpecificationContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * enumSpecification.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitEnumSpecification(GeneratedYangParser.EnumSpecificationContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * enumStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterEnumStatement(GeneratedYangParser.EnumStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * enumStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitEnumStatement(GeneratedYangParser.EnumStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * enumStatementBody.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterEnumStatementBody(GeneratedYangParser.EnumStatementBodyContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * enumStatementBody.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitEnumStatementBody(GeneratedYangParser.EnumStatementBodyContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * leafrefSpecification.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterLeafrefSpecification(GeneratedYangParser.LeafrefSpecificationContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * leafrefSpecification.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitLeafrefSpecification(GeneratedYangParser.LeafrefSpecificationContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * pathStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterPathStatement(GeneratedYangParser.PathStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * pathStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitPathStatement(GeneratedYangParser.PathStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * requireInstanceStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterRequireInstanceStatement(GeneratedYangParser.RequireInstanceStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * requireInstanceStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitRequireInstanceStatement(GeneratedYangParser.RequireInstanceStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * instanceIdentifierSpecification.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterInstanceIdentifierSpecification(
+            GeneratedYangParser.InstanceIdentifierSpecificationContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * instanceIdentifierSpecification.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitInstanceIdentifierSpecification(GeneratedYangParser.InstanceIdentifierSpecificationContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * identityrefSpecification.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterIdentityrefSpecification(GeneratedYangParser.IdentityrefSpecificationContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * identityrefSpecification.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitIdentityrefSpecification(GeneratedYangParser.IdentityrefSpecificationContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * unionSpecification.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterUnionSpecification(GeneratedYangParser.UnionSpecificationContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * unionSpecification.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitUnionSpecification(GeneratedYangParser.UnionSpecificationContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * bitsSpecification.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterBitsSpecification(GeneratedYangParser.BitsSpecificationContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * bitsSpecification.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitBitsSpecification(GeneratedYangParser.BitsSpecificationContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * bitStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterBitStatement(GeneratedYangParser.BitStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * bitStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitBitStatement(GeneratedYangParser.BitStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * bitBodyStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterBitBodyStatement(GeneratedYangParser.BitBodyStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * bitBodyStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitBitBodyStatement(GeneratedYangParser.BitBodyStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * positionStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterPositionStatement(GeneratedYangParser.PositionStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * positionStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitPositionStatement(GeneratedYangParser.PositionStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * statusStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterStatusStatement(GeneratedYangParser.StatusStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * statusStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitStatusStatement(GeneratedYangParser.StatusStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * configStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterConfigStatement(GeneratedYangParser.ConfigStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * configStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitConfigStatement(GeneratedYangParser.ConfigStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * mandatoryStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterMandatoryStatement(GeneratedYangParser.MandatoryStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * mandatoryStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitMandatoryStatement(GeneratedYangParser.MandatoryStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * presenceStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterPresenceStatement(GeneratedYangParser.PresenceStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * presenceStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitPresenceStatement(GeneratedYangParser.PresenceStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * orderedByStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterOrderedByStatement(GeneratedYangParser.OrderedByStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * orderedByStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitOrderedByStatement(GeneratedYangParser.OrderedByStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * mustStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterMustStatement(GeneratedYangParser.MustStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * mustStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitMustStatement(GeneratedYangParser.MustStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * errorMessageStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterErrorMessageStatement(GeneratedYangParser.ErrorMessageStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * errorMessageStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitErrorMessageStatement(GeneratedYangParser.ErrorMessageStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * errorAppTagStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterErrorAppTagStatement(GeneratedYangParser.ErrorAppTagStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * errorAppTagStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitErrorAppTagStatement(GeneratedYangParser.ErrorAppTagStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * minElementsStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterMinElementsStatement(GeneratedYangParser.MinElementsStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * minElementsStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitMinElementsStatement(GeneratedYangParser.MinElementsStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * maxElementsStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterMaxElementsStatement(GeneratedYangParser.MaxElementsStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * maxElementsStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitMaxElementsStatement(GeneratedYangParser.MaxElementsStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * valueStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterValueStatement(GeneratedYangParser.ValueStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * valueStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitValueStatement(GeneratedYangParser.ValueStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * groupingStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterGroupingStatement(GeneratedYangParser.GroupingStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * groupingStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitGroupingStatement(GeneratedYangParser.GroupingStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * containerStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterContainerStatement(GeneratedYangParser.ContainerStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * containerStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitContainerStatement(GeneratedYangParser.ContainerStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * leafStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterLeafStatement(GeneratedYangParser.LeafStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * leafStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitLeafStatement(GeneratedYangParser.LeafStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * leafListStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterLeafListStatement(GeneratedYangParser.LeafListStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * leafListStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitLeafListStatement(GeneratedYangParser.LeafListStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * listStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterListStatement(GeneratedYangParser.ListStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * listStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitListStatement(GeneratedYangParser.ListStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * keyStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterKeyStatement(GeneratedYangParser.KeyStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule
+     * keyStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitKeyStatement(GeneratedYangParser.KeyStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule
+     * uniqueStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterUniqueStatement(GeneratedYangParser.UniqueStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule uniqueStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitUniqueStatement(GeneratedYangParser.UniqueStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule choiceStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterChoiceStatement(GeneratedYangParser.ChoiceStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule choiceStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitChoiceStatement(GeneratedYangParser.ChoiceStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule shortCaseStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterShortCaseStatement(GeneratedYangParser.ShortCaseStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule shortCaseStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitShortCaseStatement(GeneratedYangParser.ShortCaseStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule caseStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterCaseStatement(GeneratedYangParser.CaseStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule caseStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitCaseStatement(GeneratedYangParser.CaseStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule anyxmlStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterAnyxmlStatement(GeneratedYangParser.AnyxmlStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule anyxmlStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitAnyxmlStatement(GeneratedYangParser.AnyxmlStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule usesStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterUsesStatement(GeneratedYangParser.UsesStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule usesStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitUsesStatement(GeneratedYangParser.UsesStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule refineStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterRefineStatement(GeneratedYangParser.RefineStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule refineStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitRefineStatement(GeneratedYangParser.RefineStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule refineContainerStatements.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterRefineContainerStatements(GeneratedYangParser.RefineContainerStatementsContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule refineContainerStatements.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitRefineContainerStatements(GeneratedYangParser.RefineContainerStatementsContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule refineLeafStatements.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterRefineLeafStatements(GeneratedYangParser.RefineLeafStatementsContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule refineLeafStatements.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitRefineLeafStatements(GeneratedYangParser.RefineLeafStatementsContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule refineLeafListStatements.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterRefineLeafListStatements(GeneratedYangParser.RefineLeafListStatementsContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule refineLeafListStatements.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitRefineLeafListStatements(GeneratedYangParser.RefineLeafListStatementsContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule refineListStatements.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterRefineListStatements(GeneratedYangParser.RefineListStatementsContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule refineListStatements.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitRefineListStatements(GeneratedYangParser.RefineListStatementsContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule refineChoiceStatements.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterRefineChoiceStatements(GeneratedYangParser.RefineChoiceStatementsContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule refineChoiceStatements.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitRefineChoiceStatements(GeneratedYangParser.RefineChoiceStatementsContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule refineCaseStatements.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterRefineCaseStatements(GeneratedYangParser.RefineCaseStatementsContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule refineCaseStatements.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitRefineCaseStatements(GeneratedYangParser.RefineCaseStatementsContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule refineAnyxmlStatements.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterRefineAnyxmlStatements(GeneratedYangParser.RefineAnyxmlStatementsContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule refineAnyxmlStatements.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitRefineAnyxmlStatements(GeneratedYangParser.RefineAnyxmlStatementsContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule augmentStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterAugmentStatement(GeneratedYangParser.AugmentStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule augmentStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitAugmentStatement(GeneratedYangParser.AugmentStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule whenStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterWhenStatement(GeneratedYangParser.WhenStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule whenStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitWhenStatement(GeneratedYangParser.WhenStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule rpcStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterRpcStatement(GeneratedYangParser.RpcStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule rpcStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitRpcStatement(GeneratedYangParser.RpcStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule inputStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterInputStatement(GeneratedYangParser.InputStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule inputStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitInputStatement(GeneratedYangParser.InputStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule outputStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterOutputStatement(GeneratedYangParser.OutputStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule outputStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitOutputStatement(GeneratedYangParser.OutputStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule notificationStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterNotificationStatement(GeneratedYangParser.NotificationStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule notificationStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitNotificationStatement(GeneratedYangParser.NotificationStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule deviationStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterDeviationStatement(GeneratedYangParser.DeviationStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule deviationStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitDeviationStatement(GeneratedYangParser.DeviationStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule deviateNotSupportedStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterDeviateNotSupportedStatement(GeneratedYangParser.DeviateNotSupportedStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule deviateNotSupportedStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitDeviateNotSupportedStatement(GeneratedYangParser.DeviateNotSupportedStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule deviateAddStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterDeviateAddStatement(GeneratedYangParser.DeviateAddStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule deviateAddStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitDeviateAddStatement(GeneratedYangParser.DeviateAddStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule deviateDeleteStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterDeviateDeleteStatement(GeneratedYangParser.DeviateDeleteStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule deviateDeleteStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitDeviateDeleteStatement(GeneratedYangParser.DeviateDeleteStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule deviateReplaceStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterDeviateReplaceStatement(GeneratedYangParser.DeviateReplaceStatementContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule deviateReplaceStatement.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitDeviateReplaceStatement(GeneratedYangParser.DeviateReplaceStatementContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule string.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterString(GeneratedYangParser.StringContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule string.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitString(GeneratedYangParser.StringContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule identifier.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterIdentifier(GeneratedYangParser.IdentifierContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule identifier.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitIdentifier(GeneratedYangParser.IdentifierContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule version.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterVersion(GeneratedYangParser.VersionContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule version.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitVersion(GeneratedYangParser.VersionContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule range.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterRange(GeneratedYangParser.RangeContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule range.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitRange(GeneratedYangParser.RangeContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule dateArgumentString.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterDateArgumentString(GeneratedYangParser.DateArgumentStringContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule dateArgumentString.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitDateArgumentString(GeneratedYangParser.DateArgumentStringContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule length.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterLength(GeneratedYangParser.LengthContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule length.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitLength(GeneratedYangParser.LengthContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule path.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterPath(GeneratedYangParser.PathContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule path.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitPath(GeneratedYangParser.PathContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule position.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterPosition(GeneratedYangParser.PositionContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule position.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitPosition(GeneratedYangParser.PositionContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule status.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterStatus(GeneratedYangParser.StatusContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule status.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitStatus(GeneratedYangParser.StatusContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule config.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterConfig(GeneratedYangParser.ConfigContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule config.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitConfig(GeneratedYangParser.ConfigContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule mandatory.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterMandatory(GeneratedYangParser.MandatoryContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule mandatory.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitMandatory(GeneratedYangParser.MandatoryContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule ordered-by.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterOrderedBy(GeneratedYangParser.OrderedByContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule ordered-by.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitOrderedBy(GeneratedYangParser.OrderedByContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule min elements value.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterMinValue(GeneratedYangParser.MinValueContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule min elements value.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitMinValue(GeneratedYangParser.MinValueContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule  max elements value.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterMaxValue(GeneratedYangParser.MaxValueContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule max elements value.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitMaxValue(GeneratedYangParser.MaxValueContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule key.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterKey(GeneratedYangParser.KeyContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule key.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitKey(GeneratedYangParser.KeyContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule unique.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterUnique(GeneratedYangParser.UniqueContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule unique.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitUnique(GeneratedYangParser.UniqueContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule refine.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterRefine(GeneratedYangParser.RefineContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule refine.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitRefine(GeneratedYangParser.RefineContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule augment.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterAugment(GeneratedYangParser.AugmentContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule augment.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitAugment(GeneratedYangParser.AugmentContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule augment.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterFraction(GeneratedYangParser.FractionContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule augment.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitFraction(GeneratedYangParser.FractionContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule deviation.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterDeviation(GeneratedYangParser.DeviationContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule deviation.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitDeviation(GeneratedYangParser.DeviationContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule deviation.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterValue(GeneratedYangParser.ValueContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule deviation.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitValue(GeneratedYangParser.ValueContext currentContext);
+
+    /**
+     * Enters a parse tree produced by GeneratedYangParser for grammar rule yang construct.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void enterYangConstruct(GeneratedYangParser.YangConstructContext currentContext);
+
+    /**
+     * Exits a parse tree produced by GeneratedYangParser for grammar rule yang construct.
+     *
+     * @param currentContext current context in the parsed tree
+     */
+    void exitYangConstruct(GeneratedYangParser.YangConstructContext currentContext);
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/antlrgencode/package-info.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/antlrgencode/package-info.java
new file mode 100644
index 0000000..747974e
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/antlrgencode/package-info.java
@@ -0,0 +1,20 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+/**
+ * ANTLR interfaces to be implemented by listener.
+ */
+package org.onosproject.yangutils.parser.antlrgencode;
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/exceptions/ParserException.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/exceptions/ParserException.java
new file mode 100644
index 0000000..6a18b54
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/exceptions/ParserException.java
@@ -0,0 +1,117 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.exceptions;
+
+/**
+ * Represents base class for exceptions in parser operations.
+ */
+public class ParserException extends RuntimeException {
+
+    private static final long serialVersionUID = 20160211L;
+    private int lineNumber;
+    private int charPositionInLine;
+    private String fileName;
+
+    /**
+     * Creates a new parser exception.
+     */
+    public ParserException() {
+        super();
+    }
+
+    /**
+     * Creates a new parser exception with given message.
+     *
+     * @param message the detail of exception in string
+     */
+    public ParserException(String message) {
+        super(message);
+    }
+
+    /**
+     * Creates a new parser exception from given message and cause.
+     *
+     * @param message the detail of exception in string
+     * @param cause underlying cause of the error
+     */
+    public ParserException(final String message, final Throwable cause) {
+        super(message, cause);
+    }
+
+    /**
+     * Creates a new parser exception from cause.
+     *
+     * @param cause underlying cause of the error
+     */
+    public ParserException(final Throwable cause) {
+        super(cause);
+    }
+
+    /**
+     * Returns line number of the exception.
+     *
+     * @return line number of the exception
+     */
+    public int getLineNumber() {
+        return this.lineNumber;
+    }
+
+    /**
+     * Returns YANG file name of the exception.
+     *
+     * @return YANG file name of the exception
+     */
+    public String getFileName() {
+        return this.fileName;
+    }
+
+    /**
+     * Returns position of the exception.
+     *
+     * @return position of the exception
+     */
+    public int getCharPositionInLine() {
+        return this.charPositionInLine;
+    }
+
+    /**
+     * Sets line number of YANG file.
+     *
+     * @param line line number of YANG file
+     */
+    public void setLine(int line) {
+        this.lineNumber = line;
+    }
+
+    /**
+     * Sets position of exception.
+     *
+     * @param charPosition position of exception
+     */
+    public void setCharPosition(int charPosition) {
+        this.charPositionInLine = charPosition;
+    }
+
+    /**
+     * Sets file name in parser exception.
+     *
+     * @param fileName YANG file name
+     */
+    public void setFileName(String fileName) {
+        this.fileName = fileName;
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/exceptions/package-info.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/exceptions/package-info.java
new file mode 100644
index 0000000..ec36b0d
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/exceptions/package-info.java
@@ -0,0 +1,20 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+/**
+ * Custom parser exceptions.
+ */
+package org.onosproject.yangutils.parser.exceptions;
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/TreeWalkListener.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/TreeWalkListener.java
new file mode 100644
index 0000000..194d32f
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/TreeWalkListener.java
@@ -0,0 +1,1423 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl;
+
+import java.util.Stack;
+
+import org.antlr.v4.runtime.ParserRuleContext;
+import org.antlr.v4.runtime.tree.ErrorNode;
+import org.antlr.v4.runtime.tree.TerminalNode;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.utils.Parsable;
+import org.onosproject.yangutils.datamodel.utils.YangConstructType;
+import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangListener;
+import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
+import org.onosproject.yangutils.parser.impl.listeners.AugmentListener;
+import org.onosproject.yangutils.parser.impl.listeners.BaseFileListener;
+import org.onosproject.yangutils.parser.impl.listeners.BelongsToListener;
+import org.onosproject.yangutils.parser.impl.listeners.BitListener;
+import org.onosproject.yangutils.parser.impl.listeners.BitsListener;
+import org.onosproject.yangutils.parser.impl.listeners.CaseListener;
+import org.onosproject.yangutils.parser.impl.listeners.ChoiceListener;
+import org.onosproject.yangutils.parser.impl.listeners.ConfigListener;
+import org.onosproject.yangutils.parser.impl.listeners.ContactListener;
+import org.onosproject.yangutils.parser.impl.listeners.ContainerListener;
+import org.onosproject.yangutils.parser.impl.listeners.DefaultListener;
+import org.onosproject.yangutils.parser.impl.listeners.DescriptionListener;
+import org.onosproject.yangutils.parser.impl.listeners.EnumListener;
+import org.onosproject.yangutils.parser.impl.listeners.EnumerationListener;
+import org.onosproject.yangutils.parser.impl.listeners.GroupingListener;
+import org.onosproject.yangutils.parser.impl.listeners.ImportListener;
+import org.onosproject.yangutils.parser.impl.listeners.IncludeListener;
+import org.onosproject.yangutils.parser.impl.listeners.InputListener;
+import org.onosproject.yangutils.parser.impl.listeners.KeyListener;
+import org.onosproject.yangutils.parser.impl.listeners.LeafListListener;
+import org.onosproject.yangutils.parser.impl.listeners.LeafListener;
+import org.onosproject.yangutils.parser.impl.listeners.LengthRestrictionListener;
+import org.onosproject.yangutils.parser.impl.listeners.ListListener;
+import org.onosproject.yangutils.parser.impl.listeners.MandatoryListener;
+import org.onosproject.yangutils.parser.impl.listeners.MaxElementsListener;
+import org.onosproject.yangutils.parser.impl.listeners.MinElementsListener;
+import org.onosproject.yangutils.parser.impl.listeners.ModuleListener;
+import org.onosproject.yangutils.parser.impl.listeners.NotificationListener;
+import org.onosproject.yangutils.parser.impl.listeners.NamespaceListener;
+import org.onosproject.yangutils.parser.impl.listeners.OrganizationListener;
+import org.onosproject.yangutils.parser.impl.listeners.OutputListener;
+import org.onosproject.yangutils.parser.impl.listeners.PatternRestrictionListener;
+import org.onosproject.yangutils.parser.impl.listeners.PositionListener;
+import org.onosproject.yangutils.parser.impl.listeners.PrefixListener;
+import org.onosproject.yangutils.parser.impl.listeners.PresenceListener;
+import org.onosproject.yangutils.parser.impl.listeners.RangeRestrictionListener;
+import org.onosproject.yangutils.parser.impl.listeners.ReferenceListener;
+import org.onosproject.yangutils.parser.impl.listeners.RevisionDateListener;
+import org.onosproject.yangutils.parser.impl.listeners.RevisionListener;
+import org.onosproject.yangutils.parser.impl.listeners.RpcListener;
+import org.onosproject.yangutils.parser.impl.listeners.ShortCaseListener;
+import org.onosproject.yangutils.parser.impl.listeners.StatusListener;
+import org.onosproject.yangutils.parser.impl.listeners.SubModuleListener;
+import org.onosproject.yangutils.parser.impl.listeners.TypeDefListener;
+import org.onosproject.yangutils.parser.impl.listeners.TypeListener;
+import org.onosproject.yangutils.parser.impl.listeners.UnionListener;
+import org.onosproject.yangutils.parser.impl.listeners.UnitsListener;
+import org.onosproject.yangutils.parser.impl.listeners.UsesListener;
+import org.onosproject.yangutils.parser.impl.listeners.ValueListener;
+import org.onosproject.yangutils.parser.impl.listeners.VersionListener;
+
+import static org.onosproject.yangutils.utils.UtilConstants.UNSUPPORTED_YANG_CONSTRUCT;
+import static org.onosproject.yangutils.utils.UtilConstants.CURRENTLY_UNSUPPORTED;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerUtil.handleUnsupportedYangConstruct;
+
+/**
+ * Represents ANTLR generates parse-tree. ANTLR generates a parse-tree listener interface that responds to events
+ * triggered by the built-in tree walker. The methods in listener are just
+ * callbacks. This class implements listener interface and generates the
+ * corresponding data model tree.
+ */
+public class TreeWalkListener implements GeneratedYangListener {
+
+    // List of parsable node entries maintained in stack
+    private Stack<Parsable> parsedDataStack = new Stack<>();
+
+    // Parse tree root node
+    private YangNode rootNode;
+
+    /**
+     * Returns stack of parsable data.
+     *
+     * @return stack of parsable data
+     */
+    public Stack<Parsable> getParsedDataStack() {
+        return parsedDataStack;
+    }
+
+    /**
+     * Returns root node.
+     *
+     * @return rootNode of data model tree
+     */
+    public YangNode getRootNode() {
+        return rootNode;
+    }
+
+    /**
+     * Set parsed data stack.
+     *
+     * @param parsedDataStack stack of parsable data objects
+     */
+    public void setParsedDataStack(Stack<Parsable> parsedDataStack) {
+        this.parsedDataStack = parsedDataStack;
+    }
+
+    /**
+     * Set root node.
+     *
+     * @param rootNode root node of data model tree
+     */
+    public void setRootNode(YangNode rootNode) {
+        this.rootNode = rootNode;
+    }
+
+    @Override
+    public void enterYangfile(GeneratedYangParser.YangfileContext ctx) {
+        BaseFileListener.processYangFileEntry(this, ctx);
+    }
+
+    @Override
+    public void exitYangfile(GeneratedYangParser.YangfileContext ctx) {
+        BaseFileListener.processYangFileExit(this, ctx);
+    }
+
+    @Override
+    public void enterModuleStatement(GeneratedYangParser.ModuleStatementContext ctx) {
+        ModuleListener.processModuleEntry(this, ctx);
+    }
+
+    @Override
+    public void exitModuleStatement(GeneratedYangParser.ModuleStatementContext ctx) {
+        ModuleListener.processModuleExit(this, ctx);
+    }
+
+    @Override
+    public void enterModuleBody(GeneratedYangParser.ModuleBodyContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void exitModuleBody(GeneratedYangParser.ModuleBodyContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterModuleHeaderStatement(GeneratedYangParser.ModuleHeaderStatementContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void exitModuleHeaderStatement(GeneratedYangParser.ModuleHeaderStatementContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterLinkageStatements(GeneratedYangParser.LinkageStatementsContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void exitLinkageStatements(GeneratedYangParser.LinkageStatementsContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterMetaStatements(GeneratedYangParser.MetaStatementsContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void exitMetaStatements(GeneratedYangParser.MetaStatementsContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterRevisionStatements(GeneratedYangParser.RevisionStatementsContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void exitRevisionStatements(GeneratedYangParser.RevisionStatementsContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterBodyStatements(GeneratedYangParser.BodyStatementsContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void exitBodyStatements(GeneratedYangParser.BodyStatementsContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterYangVersionStatement(GeneratedYangParser.YangVersionStatementContext ctx) {
+        VersionListener.processVersionEntry(this, ctx);
+    }
+
+    @Override
+    public void exitYangVersionStatement(GeneratedYangParser.YangVersionStatementContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterNamespaceStatement(GeneratedYangParser.NamespaceStatementContext ctx) {
+        NamespaceListener.processNamespaceEntry(this, ctx);
+    }
+
+    @Override
+    public void exitNamespaceStatement(GeneratedYangParser.NamespaceStatementContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterPrefixStatement(GeneratedYangParser.PrefixStatementContext ctx) {
+        PrefixListener.processPrefixEntry(this, ctx);
+    }
+
+    @Override
+    public void exitPrefixStatement(GeneratedYangParser.PrefixStatementContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterImportStatement(GeneratedYangParser.ImportStatementContext ctx) {
+        ImportListener.processImportEntry(this, ctx);
+    }
+
+    @Override
+    public void exitImportStatement(GeneratedYangParser.ImportStatementContext ctx) {
+        ImportListener.processImportExit(this, ctx);
+    }
+
+    @Override
+    public void enterImportStatementBody(GeneratedYangParser.ImportStatementBodyContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void exitImportStatementBody(GeneratedYangParser.ImportStatementBodyContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterRevisionDateStatement(GeneratedYangParser.RevisionDateStatementContext ctx) {
+        RevisionDateListener.processRevisionDateEntry(this, ctx);
+    }
+
+    @Override
+    public void exitRevisionDateStatement(GeneratedYangParser.RevisionDateStatementContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterIncludeStatement(GeneratedYangParser.IncludeStatementContext ctx) {
+        IncludeListener.processIncludeEntry(this, ctx);
+    }
+
+    @Override
+    public void exitIncludeStatement(GeneratedYangParser.IncludeStatementContext ctx) {
+        IncludeListener.processIncludeExit(this, ctx);
+    }
+
+    @Override
+    public void enterOrganizationStatement(GeneratedYangParser.OrganizationStatementContext ctx) {
+        OrganizationListener.processOrganizationEntry(this, ctx);
+    }
+
+    @Override
+    public void exitOrganizationStatement(GeneratedYangParser.OrganizationStatementContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterContactStatement(GeneratedYangParser.ContactStatementContext ctx) {
+        ContactListener.processContactEntry(this, ctx);
+    }
+
+    @Override
+    public void exitContactStatement(GeneratedYangParser.ContactStatementContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterDescriptionStatement(GeneratedYangParser.DescriptionStatementContext ctx) {
+        DescriptionListener.processDescriptionEntry(this, ctx);
+    }
+
+    @Override
+    public void exitDescriptionStatement(GeneratedYangParser.DescriptionStatementContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterReferenceStatement(GeneratedYangParser.ReferenceStatementContext ctx) {
+        ReferenceListener.processReferenceEntry(this, ctx);
+    }
+
+    @Override
+    public void exitReferenceStatement(GeneratedYangParser.ReferenceStatementContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterRevisionStatement(GeneratedYangParser.RevisionStatementContext ctx) {
+        RevisionListener.processRevisionEntry(this, ctx);
+    }
+
+    @Override
+    public void exitRevisionStatement(GeneratedYangParser.RevisionStatementContext ctx) {
+        RevisionListener.processRevisionExit(this, ctx);
+    }
+
+    @Override
+    public void enterRevisionStatementBody(GeneratedYangParser.RevisionStatementBodyContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void exitRevisionStatementBody(GeneratedYangParser.RevisionStatementBodyContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterSubModuleStatement(GeneratedYangParser.SubModuleStatementContext ctx) {
+        SubModuleListener.processSubModuleEntry(this, ctx);
+    }
+
+    @Override
+    public void exitSubModuleStatement(GeneratedYangParser.SubModuleStatementContext ctx) {
+        SubModuleListener.processSubModuleExit(this, ctx);
+    }
+
+    @Override
+    public void enterSubmoduleBody(GeneratedYangParser.SubmoduleBodyContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void exitSubmoduleBody(GeneratedYangParser.SubmoduleBodyContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterSubmoduleHeaderStatement(GeneratedYangParser.SubmoduleHeaderStatementContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void exitSubmoduleHeaderStatement(GeneratedYangParser.SubmoduleHeaderStatementContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterBelongstoStatement(GeneratedYangParser.BelongstoStatementContext ctx) {
+        BelongsToListener.processBelongsToEntry(this, ctx);
+    }
+
+    @Override
+    public void exitBelongstoStatement(GeneratedYangParser.BelongstoStatementContext ctx) {
+        BelongsToListener.processBelongsToExit(this, ctx);
+    }
+
+    @Override
+    public void enterBelongstoStatementBody(GeneratedYangParser.BelongstoStatementBodyContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void exitBelongstoStatementBody(GeneratedYangParser.BelongstoStatementBodyContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterExtensionStatement(GeneratedYangParser.ExtensionStatementContext ctx) {
+        handleUnsupportedYangConstruct(YangConstructType.EXTENSION_DATA, ctx, UNSUPPORTED_YANG_CONSTRUCT);
+    }
+
+    @Override
+    public void exitExtensionStatement(GeneratedYangParser.ExtensionStatementContext ctx) {
+        // do nothing
+    }
+
+    @Override
+    public void enterExtensionBody(GeneratedYangParser.ExtensionBodyContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void exitExtensionBody(GeneratedYangParser.ExtensionBodyContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterArgumentStatement(GeneratedYangParser.ArgumentStatementContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void exitArgumentStatement(GeneratedYangParser.ArgumentStatementContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterArgumentBody(GeneratedYangParser.ArgumentBodyContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void exitArgumentBody(GeneratedYangParser.ArgumentBodyContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterYinElementStatement(GeneratedYangParser.YinElementStatementContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void exitYinElementStatement(GeneratedYangParser.YinElementStatementContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterIdentityStatement(GeneratedYangParser.IdentityStatementContext ctx) {
+        handleUnsupportedYangConstruct(YangConstructType.IDENTITY_DATA, ctx, CURRENTLY_UNSUPPORTED);
+    }
+
+    @Override
+    public void exitIdentityStatement(GeneratedYangParser.IdentityStatementContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterIdentityBody(GeneratedYangParser.IdentityBodyContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void exitIdentityBody(GeneratedYangParser.IdentityBodyContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterBaseStatement(GeneratedYangParser.BaseStatementContext ctx) {
+        handleUnsupportedYangConstruct(YangConstructType.BASE_DATA, ctx, CURRENTLY_UNSUPPORTED);
+    }
+
+    @Override
+    public void exitBaseStatement(GeneratedYangParser.BaseStatementContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterFeatureStatement(GeneratedYangParser.FeatureStatementContext ctx) {
+        handleUnsupportedYangConstruct(YangConstructType.FEATURE_DATA, ctx, CURRENTLY_UNSUPPORTED);
+    }
+
+    @Override
+    public void exitFeatureStatement(GeneratedYangParser.FeatureStatementContext ctx) {
+        //TODO: to be implemented
+    }
+
+    @Override
+    public void enterFeatureBody(GeneratedYangParser.FeatureBodyContext ctx) {
+        //TODO : to be implemented
+    }
+
+    @Override
+    public void exitFeatureBody(GeneratedYangParser.FeatureBodyContext ctx) {
+        //TODO : to be implemented
+    }
+
+    @Override
+    public void enterDataDefStatement(GeneratedYangParser.DataDefStatementContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void exitDataDefStatement(GeneratedYangParser.DataDefStatementContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterIfFeatureStatement(GeneratedYangParser.IfFeatureStatementContext ctx) {
+        // TODO: to be implemented
+    }
+
+    @Override
+    public void exitIfFeatureStatement(GeneratedYangParser.IfFeatureStatementContext ctx) {
+        // TODO: to be implemented
+    }
+
+    @Override
+    public void enterUnitsStatement(GeneratedYangParser.UnitsStatementContext ctx) {
+        UnitsListener.processUnitsEntry(this, ctx);
+    }
+
+    @Override
+    public void exitUnitsStatement(GeneratedYangParser.UnitsStatementContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterTypedefStatement(GeneratedYangParser.TypedefStatementContext ctx) {
+        TypeDefListener.processTypeDefEntry(this, ctx);
+    }
+
+    @Override
+    public void exitTypedefStatement(GeneratedYangParser.TypedefStatementContext ctx) {
+        TypeDefListener.processTypeDefExit(this, ctx);
+    }
+
+    @Override
+    public void enterTypeStatement(GeneratedYangParser.TypeStatementContext ctx) {
+        TypeListener.processTypeEntry(this, ctx);
+    }
+
+    @Override
+    public void exitTypeStatement(GeneratedYangParser.TypeStatementContext ctx) {
+        TypeListener.processTypeExit(this, ctx);
+    }
+
+    @Override
+    public void enterTypeBodyStatements(GeneratedYangParser.TypeBodyStatementsContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void exitTypeBodyStatements(GeneratedYangParser.TypeBodyStatementsContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterDecimal64Specification(GeneratedYangParser.Decimal64SpecificationContext ctx) {
+        // TODO: implement the method.
+    }
+
+    @Override
+    public void exitDecimal64Specification(GeneratedYangParser.Decimal64SpecificationContext ctx) {
+        // TODO: implement the method.
+    }
+
+    @Override
+    public void enterNumericalRestrictions(GeneratedYangParser.NumericalRestrictionsContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void exitNumericalRestrictions(GeneratedYangParser.NumericalRestrictionsContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterRangeStatement(GeneratedYangParser.RangeStatementContext ctx) {
+        RangeRestrictionListener.processRangeRestrictionEntry(this, ctx);
+    }
+
+    @Override
+    public void exitRangeStatement(GeneratedYangParser.RangeStatementContext ctx) {
+        RangeRestrictionListener.processRangeRestrictionExit(this, ctx);
+    }
+
+    @Override
+    public void enterCommonStatements(GeneratedYangParser.CommonStatementsContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void exitCommonStatements(GeneratedYangParser.CommonStatementsContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterStringRestrictions(GeneratedYangParser.StringRestrictionsContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void exitStringRestrictions(GeneratedYangParser.StringRestrictionsContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterLengthStatement(GeneratedYangParser.LengthStatementContext ctx) {
+        LengthRestrictionListener.processLengthRestrictionEntry(this, ctx);
+    }
+
+    @Override
+    public void exitLengthStatement(GeneratedYangParser.LengthStatementContext ctx) {
+        LengthRestrictionListener.processLengthRestrictionExit(this, ctx);
+    }
+
+    @Override
+    public void enterPatternStatement(GeneratedYangParser.PatternStatementContext ctx) {
+        PatternRestrictionListener.processPatternRestrictionEntry(this, ctx);
+    }
+
+    @Override
+    public void exitPatternStatement(GeneratedYangParser.PatternStatementContext ctx) {
+        PatternRestrictionListener.processPatternRestrictionExit(this, ctx);
+    }
+
+    @Override
+    public void enterDefaultStatement(GeneratedYangParser.DefaultStatementContext ctx) {
+        DefaultListener.processDefaultEntry(this, ctx);
+    }
+
+    @Override
+    public void exitDefaultStatement(GeneratedYangParser.DefaultStatementContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterEnumSpecification(GeneratedYangParser.EnumSpecificationContext ctx) {
+        EnumerationListener.processEnumerationEntry(this, ctx);
+    }
+
+    @Override
+    public void exitEnumSpecification(GeneratedYangParser.EnumSpecificationContext ctx) {
+        EnumerationListener.processEnumerationExit(this, ctx);
+    }
+
+    @Override
+    public void enterEnumStatement(GeneratedYangParser.EnumStatementContext ctx) {
+        EnumListener.processEnumEntry(this, ctx);
+    }
+
+    @Override
+    public void exitEnumStatement(GeneratedYangParser.EnumStatementContext ctx) {
+        EnumListener.processEnumExit(this, ctx);
+    }
+
+    @Override
+    public void enterEnumStatementBody(GeneratedYangParser.EnumStatementBodyContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void exitEnumStatementBody(GeneratedYangParser.EnumStatementBodyContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterLeafrefSpecification(GeneratedYangParser.LeafrefSpecificationContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void exitLeafrefSpecification(GeneratedYangParser.LeafrefSpecificationContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterPathStatement(GeneratedYangParser.PathStatementContext ctx) {
+        handleUnsupportedYangConstruct(YangConstructType.PATH_DATA, ctx, CURRENTLY_UNSUPPORTED);
+    }
+
+    @Override
+    public void exitPathStatement(GeneratedYangParser.PathStatementContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterRequireInstanceStatement(GeneratedYangParser.RequireInstanceStatementContext ctx) {
+        handleUnsupportedYangConstruct(YangConstructType.REQUIRE_INSTANCE_DATA, ctx, UNSUPPORTED_YANG_CONSTRUCT);
+    }
+
+    @Override
+    public void exitRequireInstanceStatement(GeneratedYangParser.RequireInstanceStatementContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterInstanceIdentifierSpecification(GeneratedYangParser.InstanceIdentifierSpecificationContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void exitInstanceIdentifierSpecification(GeneratedYangParser.InstanceIdentifierSpecificationContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterIdentityrefSpecification(GeneratedYangParser.IdentityrefSpecificationContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void exitIdentityrefSpecification(GeneratedYangParser.IdentityrefSpecificationContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterUnionSpecification(GeneratedYangParser.UnionSpecificationContext ctx) {
+        UnionListener.processUnionEntry(this, ctx);
+    }
+
+    @Override
+    public void exitUnionSpecification(GeneratedYangParser.UnionSpecificationContext ctx) {
+        UnionListener.processUnionExit(this, ctx);
+    }
+
+    @Override
+    public void enterBitsSpecification(GeneratedYangParser.BitsSpecificationContext ctx) {
+        BitsListener.processBitsEntry(this, ctx);
+    }
+
+    @Override
+    public void exitBitsSpecification(GeneratedYangParser.BitsSpecificationContext ctx) {
+        BitsListener.processBitsExit(this, ctx);
+    }
+
+    @Override
+    public void enterBitStatement(GeneratedYangParser.BitStatementContext ctx) {
+        BitListener.processBitEntry(this, ctx);
+    }
+
+    @Override
+    public void exitBitStatement(GeneratedYangParser.BitStatementContext ctx) {
+        BitListener.processBitExit(this, ctx);
+    }
+
+    @Override
+    public void enterBitBodyStatement(GeneratedYangParser.BitBodyStatementContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void exitBitBodyStatement(GeneratedYangParser.BitBodyStatementContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterPositionStatement(GeneratedYangParser.PositionStatementContext ctx) {
+        PositionListener.processPositionEntry(this, ctx);
+    }
+
+    @Override
+    public void exitPositionStatement(GeneratedYangParser.PositionStatementContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterStatusStatement(GeneratedYangParser.StatusStatementContext ctx) {
+        StatusListener.processStatusEntry(this, ctx);
+    }
+
+    @Override
+    public void exitStatusStatement(GeneratedYangParser.StatusStatementContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterConfigStatement(GeneratedYangParser.ConfigStatementContext ctx) {
+        ConfigListener.processConfigEntry(this, ctx);
+    }
+
+    @Override
+    public void exitConfigStatement(GeneratedYangParser.ConfigStatementContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterMandatoryStatement(GeneratedYangParser.MandatoryStatementContext ctx) {
+        MandatoryListener.processMandatoryEntry(this, ctx);
+    }
+
+    @Override
+    public void exitMandatoryStatement(GeneratedYangParser.MandatoryStatementContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterPresenceStatement(GeneratedYangParser.PresenceStatementContext ctx) {
+        PresenceListener.processPresenceEntry(this, ctx);
+    }
+
+    @Override
+    public void exitPresenceStatement(GeneratedYangParser.PresenceStatementContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterOrderedByStatement(GeneratedYangParser.OrderedByStatementContext ctx) {
+        handleUnsupportedYangConstruct(YangConstructType.ORDERED_BY_DATA, ctx, CURRENTLY_UNSUPPORTED);
+    }
+
+    @Override
+    public void exitOrderedByStatement(GeneratedYangParser.OrderedByStatementContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterMustStatement(GeneratedYangParser.MustStatementContext ctx) {
+        // TODO: to be implemented
+    }
+
+    @Override
+    public void exitMustStatement(GeneratedYangParser.MustStatementContext ctx) {
+        // TODO: to be implemented
+    }
+
+    @Override
+    public void enterErrorMessageStatement(GeneratedYangParser.ErrorMessageStatementContext ctx) {
+        handleUnsupportedYangConstruct(YangConstructType.ERROR_MESSAGE_DATA, ctx, CURRENTLY_UNSUPPORTED);
+    }
+
+    @Override
+    public void exitErrorMessageStatement(GeneratedYangParser.ErrorMessageStatementContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterErrorAppTagStatement(GeneratedYangParser.ErrorAppTagStatementContext ctx) {
+        handleUnsupportedYangConstruct(YangConstructType.ERROR_APP_TAG_DATA, ctx, CURRENTLY_UNSUPPORTED);
+    }
+
+    @Override
+    public void exitErrorAppTagStatement(GeneratedYangParser.ErrorAppTagStatementContext ctx) {
+        //do nothing
+    }
+
+    @Override
+    public void enterMinElementsStatement(GeneratedYangParser.MinElementsStatementContext ctx) {
+        MinElementsListener.processMinElementsEntry(this, ctx);
+    }
+
+    @Override
+    public void exitMinElementsStatement(GeneratedYangParser.MinElementsStatementContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterMaxElementsStatement(GeneratedYangParser.MaxElementsStatementContext ctx) {
+        MaxElementsListener.processMaxElementsEntry(this, ctx);
+    }
+
+    @Override
+    public void exitMaxElementsStatement(GeneratedYangParser.MaxElementsStatementContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterValueStatement(GeneratedYangParser.ValueStatementContext ctx) {
+        ValueListener.processValueEntry(this, ctx);
+    }
+
+    @Override
+    public void exitValueStatement(GeneratedYangParser.ValueStatementContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterGroupingStatement(GeneratedYangParser.GroupingStatementContext ctx) {
+        GroupingListener.processGroupingEntry(this, ctx);
+    }
+
+    @Override
+    public void exitGroupingStatement(GeneratedYangParser.GroupingStatementContext ctx) {
+        GroupingListener.processGroupingExit(this, ctx);
+    }
+
+    @Override
+    public void enterContainerStatement(GeneratedYangParser.ContainerStatementContext ctx) {
+        ContainerListener.processContainerEntry(this, ctx);
+    }
+
+    @Override
+    public void exitContainerStatement(GeneratedYangParser.ContainerStatementContext ctx) {
+        ContainerListener.processContainerExit(this, ctx);
+    }
+
+    @Override
+    public void enterLeafStatement(GeneratedYangParser.LeafStatementContext ctx) {
+        LeafListener.processLeafEntry(this, ctx);
+    }
+
+    @Override
+    public void exitLeafStatement(GeneratedYangParser.LeafStatementContext ctx) {
+        LeafListener.processLeafExit(this, ctx);
+    }
+
+    @Override
+    public void enterLeafListStatement(GeneratedYangParser.LeafListStatementContext ctx) {
+        LeafListListener.processLeafListEntry(this, ctx);
+    }
+
+    @Override
+    public void exitLeafListStatement(GeneratedYangParser.LeafListStatementContext ctx) {
+        LeafListListener.processLeafListExit(this, ctx);
+    }
+
+    @Override
+    public void enterListStatement(GeneratedYangParser.ListStatementContext ctx) {
+        ListListener.processListEntry(this, ctx);
+    }
+
+    @Override
+    public void exitListStatement(GeneratedYangParser.ListStatementContext ctx) {
+        ListListener.processListExit(this, ctx);
+    }
+
+    @Override
+    public void enterKeyStatement(GeneratedYangParser.KeyStatementContext ctx) {
+        KeyListener.processKeyEntry(this, ctx);
+    }
+
+    @Override
+    public void exitKeyStatement(GeneratedYangParser.KeyStatementContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterUniqueStatement(GeneratedYangParser.UniqueStatementContext ctx) {
+        handleUnsupportedYangConstruct(YangConstructType.UNIQUE_DATA, ctx, CURRENTLY_UNSUPPORTED);
+    }
+
+    @Override
+    public void exitUniqueStatement(GeneratedYangParser.UniqueStatementContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterChoiceStatement(GeneratedYangParser.ChoiceStatementContext ctx) {
+        ChoiceListener.processChoiceEntry(this, ctx);
+    }
+
+    @Override
+    public void exitChoiceStatement(GeneratedYangParser.ChoiceStatementContext ctx) {
+        ChoiceListener.processChoiceExit(this, ctx);
+    }
+
+    @Override
+    public void enterShortCaseStatement(GeneratedYangParser.ShortCaseStatementContext ctx) {
+        ShortCaseListener.processShortCaseEntry(this, ctx);
+    }
+
+    @Override
+    public void exitShortCaseStatement(GeneratedYangParser.ShortCaseStatementContext ctx) {
+        ShortCaseListener.processShortCaseExit(this, ctx);
+    }
+
+    @Override
+    public void enterCaseStatement(GeneratedYangParser.CaseStatementContext ctx) {
+        CaseListener.processCaseEntry(this, ctx);
+    }
+
+    @Override
+    public void exitCaseStatement(GeneratedYangParser.CaseStatementContext ctx) {
+        CaseListener.processCaseExit(this, ctx);
+    }
+
+    @Override
+    public void enterAnyxmlStatement(GeneratedYangParser.AnyxmlStatementContext ctx) {
+        handleUnsupportedYangConstruct(YangConstructType.ANYXML_DATA, ctx, UNSUPPORTED_YANG_CONSTRUCT);
+    }
+
+    @Override
+    public void exitAnyxmlStatement(GeneratedYangParser.AnyxmlStatementContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterUsesStatement(GeneratedYangParser.UsesStatementContext ctx) {
+        UsesListener.processUsesEntry(this, ctx);
+    }
+
+    @Override
+    public void exitUsesStatement(GeneratedYangParser.UsesStatementContext ctx) {
+        UsesListener.processUsesExit(this, ctx);
+    }
+
+    @Override
+    public void enterRefineStatement(GeneratedYangParser.RefineStatementContext ctx) {
+        handleUnsupportedYangConstruct(YangConstructType.REFINE_DATA, ctx, UNSUPPORTED_YANG_CONSTRUCT);
+    }
+
+    @Override
+    public void exitRefineStatement(GeneratedYangParser.RefineStatementContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterRefineContainerStatements(GeneratedYangParser.RefineContainerStatementsContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void exitRefineContainerStatements(GeneratedYangParser.RefineContainerStatementsContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterRefineLeafStatements(GeneratedYangParser.RefineLeafStatementsContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void exitRefineLeafStatements(GeneratedYangParser.RefineLeafStatementsContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterRefineLeafListStatements(GeneratedYangParser.RefineLeafListStatementsContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void exitRefineLeafListStatements(GeneratedYangParser.RefineLeafListStatementsContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterRefineListStatements(GeneratedYangParser.RefineListStatementsContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void exitRefineListStatements(GeneratedYangParser.RefineListStatementsContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterRefineChoiceStatements(GeneratedYangParser.RefineChoiceStatementsContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void exitRefineChoiceStatements(GeneratedYangParser.RefineChoiceStatementsContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterRefineCaseStatements(GeneratedYangParser.RefineCaseStatementsContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void exitRefineCaseStatements(GeneratedYangParser.RefineCaseStatementsContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterRefineAnyxmlStatements(GeneratedYangParser.RefineAnyxmlStatementsContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void exitRefineAnyxmlStatements(GeneratedYangParser.RefineAnyxmlStatementsContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterAugmentStatement(GeneratedYangParser.AugmentStatementContext ctx) {
+        AugmentListener.processAugmentEntry(this, ctx);
+    }
+
+    @Override
+    public void exitAugmentStatement(GeneratedYangParser.AugmentStatementContext ctx) {
+        AugmentListener.processAugmentExit(this, ctx);
+    }
+
+    @Override
+    public void enterWhenStatement(GeneratedYangParser.WhenStatementContext ctx) {
+        // TODO: to be implemented
+    }
+
+    @Override
+    public void exitWhenStatement(GeneratedYangParser.WhenStatementContext ctx) {
+        // TODO: to be implemented
+    }
+
+    @Override
+    public void enterRpcStatement(GeneratedYangParser.RpcStatementContext ctx) {
+        RpcListener.processRpcEntry(this, ctx);
+    }
+
+    @Override
+    public void exitRpcStatement(GeneratedYangParser.RpcStatementContext ctx) {
+        RpcListener.processRpcExit(this, ctx);
+    }
+
+    @Override
+    public void enterInputStatement(GeneratedYangParser.InputStatementContext ctx) {
+        InputListener.processInputEntry(this, ctx);
+    }
+
+    @Override
+    public void exitInputStatement(GeneratedYangParser.InputStatementContext ctx) {
+        InputListener.processInputExit(this, ctx);
+    }
+
+    @Override
+    public void enterOutputStatement(GeneratedYangParser.OutputStatementContext ctx) {
+        OutputListener.processOutputEntry(this, ctx);
+    }
+
+    @Override
+    public void exitOutputStatement(GeneratedYangParser.OutputStatementContext ctx) {
+        OutputListener.processOutputExit(this, ctx);
+    }
+
+    @Override
+    public void enterNotificationStatement(GeneratedYangParser.NotificationStatementContext ctx) {
+        NotificationListener.processNotificationEntry(this, ctx);
+    }
+
+    @Override
+    public void exitNotificationStatement(GeneratedYangParser.NotificationStatementContext ctx) {
+        NotificationListener.processNotificationExit(this, ctx);
+    }
+
+    @Override
+    public void enterDeviationStatement(GeneratedYangParser.DeviationStatementContext ctx) {
+        handleUnsupportedYangConstruct(YangConstructType.DEVIATION_DATA, ctx, UNSUPPORTED_YANG_CONSTRUCT);
+    }
+
+    @Override
+    public void exitDeviationStatement(GeneratedYangParser.DeviationStatementContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterDeviateNotSupportedStatement(GeneratedYangParser.DeviateNotSupportedStatementContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void exitDeviateNotSupportedStatement(GeneratedYangParser.DeviateNotSupportedStatementContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterDeviateAddStatement(GeneratedYangParser.DeviateAddStatementContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void exitDeviateAddStatement(GeneratedYangParser.DeviateAddStatementContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterDeviateDeleteStatement(GeneratedYangParser.DeviateDeleteStatementContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void exitDeviateDeleteStatement(GeneratedYangParser.DeviateDeleteStatementContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterDeviateReplaceStatement(GeneratedYangParser.DeviateReplaceStatementContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void exitDeviateReplaceStatement(GeneratedYangParser.DeviateReplaceStatementContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterString(GeneratedYangParser.StringContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void exitString(GeneratedYangParser.StringContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterIdentifier(GeneratedYangParser.IdentifierContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void exitIdentifier(GeneratedYangParser.IdentifierContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterDateArgumentString(GeneratedYangParser.DateArgumentStringContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void exitDateArgumentString(GeneratedYangParser.DateArgumentStringContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterRange(GeneratedYangParser.RangeContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void exitRange(GeneratedYangParser.RangeContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterLength(GeneratedYangParser.LengthContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void exitLength(GeneratedYangParser.LengthContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterPath(GeneratedYangParser.PathContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void exitPath(GeneratedYangParser.PathContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterPosition(GeneratedYangParser.PositionContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void exitPosition(GeneratedYangParser.PositionContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterStatus(GeneratedYangParser.StatusContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void exitStatus(GeneratedYangParser.StatusContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterConfig(GeneratedYangParser.ConfigContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void exitConfig(GeneratedYangParser.ConfigContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterMandatory(GeneratedYangParser.MandatoryContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void exitMandatory(GeneratedYangParser.MandatoryContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterOrderedBy(GeneratedYangParser.OrderedByContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void exitOrderedBy(GeneratedYangParser.OrderedByContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterMinValue(GeneratedYangParser.MinValueContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void exitMinValue(GeneratedYangParser.MinValueContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterMaxValue(GeneratedYangParser.MaxValueContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void exitMaxValue(GeneratedYangParser.MaxValueContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterKey(GeneratedYangParser.KeyContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void exitKey(GeneratedYangParser.KeyContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterUnique(GeneratedYangParser.UniqueContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void exitUnique(GeneratedYangParser.UniqueContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterRefine(GeneratedYangParser.RefineContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void exitRefine(GeneratedYangParser.RefineContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterAugment(GeneratedYangParser.AugmentContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void exitAugment(GeneratedYangParser.AugmentContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterDeviation(GeneratedYangParser.DeviationContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void exitDeviation(GeneratedYangParser.DeviationContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterYangConstruct(GeneratedYangParser.YangConstructContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void exitYangConstruct(GeneratedYangParser.YangConstructContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterVersion(GeneratedYangParser.VersionContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void exitVersion(GeneratedYangParser.VersionContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterValue(GeneratedYangParser.ValueContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void exitValue(GeneratedYangParser.ValueContext ctx) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterFraction(GeneratedYangParser.FractionContext ctx) {
+        // TODO: implement the method.
+    }
+
+    @Override
+    public void exitFraction(GeneratedYangParser.FractionContext ctx) {
+        // TODO: implement the method.
+    }
+
+    @Override
+    public void visitTerminal(TerminalNode terminalNode) {
+        // do nothing.
+    }
+
+    @Override
+    public void visitErrorNode(ErrorNode errorNode) {
+        // do nothing.
+    }
+
+    @Override
+    public void enterEveryRule(ParserRuleContext parserRuleContext) {
+        // do nothing.
+    }
+
+    @Override
+    public void exitEveryRule(ParserRuleContext parserRuleContext) {
+        // do nothing.
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/YangUtilsParserManager.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/YangUtilsParserManager.java
new file mode 100644
index 0000000..6a5b1d2
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/YangUtilsParserManager.java
@@ -0,0 +1,104 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl;
+
+import java.io.IOException;
+
+import org.antlr.v4.runtime.ANTLRFileStream;
+import org.antlr.v4.runtime.ANTLRInputStream;
+import org.antlr.v4.runtime.CommonTokenStream;
+import org.antlr.v4.runtime.tree.ParseTree;
+import org.antlr.v4.runtime.tree.ParseTreeWalker;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.parser.YangUtilsParser;
+import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangLexer;
+import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.parserutils.ParseTreeErrorListener;
+
+/**
+ * Represents file parsing, parse tree creation and data model tree creation
+ * corresponding to an input YANG file.
+ */
+public class YangUtilsParserManager implements YangUtilsParser {
+
+    @Override
+    public YangNode getDataModel(String yangFile) throws IOException, ParserException {
+
+        /**
+         * Create a char stream that reads from YANG file. Throws an exception
+         * in case input YANG file is either null or non existent.
+         */
+        ANTLRInputStream input;
+        try {
+            input = new ANTLRFileStream(yangFile);
+        } catch (IOException e) {
+            throw new ParserException("YANG file error : YANG file does not exist.");
+        }
+
+        // Create a lexer that feeds off of input char stream.
+        GeneratedYangLexer lexer = new GeneratedYangLexer(input);
+
+        // Create a buffer of tokens pulled from the lexer.
+        CommonTokenStream tokens = new CommonTokenStream(lexer);
+
+        // Create a parser that feeds off the tokens buffer.
+        GeneratedYangParser parser = new GeneratedYangParser(tokens);
+
+        // Remove console error listener.
+        parser.removeErrorListeners();
+
+        // Create instance of customized error listener.
+        ParseTreeErrorListener parseTreeErrorListener = new ParseTreeErrorListener();
+
+        // Add customized error listener to catch errors during parsing.
+        parser.addErrorListener(parseTreeErrorListener);
+
+        ParseTree tree;
+
+        try {
+            // Begin parsing YANG file and generate parse tree.
+            tree = parser.yangfile();
+        } catch (ParserException parserException) {
+            parserException.setFileName(yangFile);
+            throw parserException;
+        }
+
+        // Create a walker to walk the parse tree.
+        ParseTreeWalker walker = new ParseTreeWalker();
+
+        // Create a listener implementation class object.
+        TreeWalkListener treeWalker = new TreeWalkListener();
+
+        /**
+         * Walk parse tree, provide call backs to methods in listener and build
+         * data model tree.
+         */
+        try {
+            walker.walk(treeWalker, tree);
+        } catch (ParserException listenerException) {
+            // TODO free incomplete data model tree.
+            listenerException.setFileName(yangFile);
+            throw listenerException;
+        } finally {
+            // TODO free parsable stack
+        }
+
+        // Returns the Root Node of the constructed data model tree.
+        return treeWalker.getRootNode();
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/AugmentListener.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/AugmentListener.java
new file mode 100644
index 0000000..b6172ed
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/AugmentListener.java
@@ -0,0 +1,211 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import java.util.List;
+
+import org.onosproject.yangutils.datamodel.YangAugment;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangNodeIdentifier;
+import org.onosproject.yangutils.datamodel.YangSubModule;
+import org.onosproject.yangutils.datamodel.YangUses;
+import org.onosproject.yangutils.datamodel.exceptions.DataModelException;
+import org.onosproject.yangutils.datamodel.utils.Parsable;
+import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.TreeWalkListener;
+
+import static org.onosproject.yangutils.datamodel.utils.GeneratedLanguage.JAVA_GENERATION;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.AUGMENT_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.CASE_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.DATA_DEF_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.DESCRIPTION_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.REFERENCE_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.STATUS_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.WHEN_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.AugmentListenerUtil.generateNameForAugmentNode;
+import static org.onosproject.yangutils.parser.impl.parserutils.AugmentListenerUtil.getParentsPrefix;
+import static org.onosproject.yangutils.parser.impl.parserutils.AugmentListenerUtil.parserException;
+import static org.onosproject.yangutils.parser.impl.parserutils.AugmentListenerUtil.validateNodeInTargetPath;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerCollisionDetector.detectCollidingChildUtil;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.ENTRY;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.EXIT;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction
+        .constructExtendedListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction
+        .constructListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_CURRENT_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.UNHANDLED_PARSED_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerUtil.getValidAbsoluteSchemaNodeId;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.validateCardinalityMaxOne;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.validateMutuallyExclusiveChilds;
+import static org.onosproject.yangutils.translator.tojava.YangDataModelFactory.getYangAugmentNode;
+
+/*
+ * Reference: RFC6020 and YANG ANTLR Grammar
+ *
+ * ABNF grammar as per RFC6020
+ *  augment-stmt        = augment-keyword sep augment-arg-str optsep
+ *                        "{" stmtsep
+ *                            ;; these stmts can appear in any order
+ *                            [when-stmt stmtsep]
+ *                            *(if-feature-stmt stmtsep)
+ *                            [status-stmt stmtsep]
+ *                            [description-stmt stmtsep]
+ *                            [reference-stmt stmtsep]
+ *                            1*((data-def-stmt stmtsep) /
+ *                               (case-stmt stmtsep))
+ *                         "}"
+ *
+ * ANTLR grammar rule
+ * augmentStatement : AUGMENT_KEYWORD augment LEFT_CURLY_BRACE (whenStatement | ifFeatureStatement | statusStatement
+ *      | descriptionStatement | referenceStatement | dataDefStatement  | caseStatement)* RIGHT_CURLY_BRACE;
+ */
+
+/**
+ * Represents listener based call back function corresponding to the "augment"
+ * rule defined in ANTLR grammar file for corresponding ABNF rule in RFC 6020.
+ */
+public final class AugmentListener {
+
+    /**
+     * Creates a new augment listener.
+     */
+    private AugmentListener() {
+    }
+
+    /**
+     * It is called when parser receives an input matching the grammar rule
+     * (augment), performs validation and updates the data model tree.
+     *
+     * @param listener listener's object
+     * @param ctx context object of the grammar rule
+     */
+    public static void processAugmentEntry(TreeWalkListener listener,
+            GeneratedYangParser.AugmentStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, AUGMENT_DATA, ctx.augment().getText(), ENTRY);
+
+        // Validate augment argument string
+        List<YangNodeIdentifier> targetNodes = getValidAbsoluteSchemaNodeId(ctx.augment().getText(),
+                AUGMENT_DATA, ctx);
+
+        // Validate sub statement cardinality.
+        validateSubStatementsCardinality(ctx);
+
+        // Check for identifier collision
+        int line = ctx.getStart().getLine();
+        int charPositionInLine = ctx.getStart().getCharPositionInLine();
+        detectCollidingChildUtil(listener, line, charPositionInLine, "", AUGMENT_DATA);
+
+        Parsable curData = listener.getParsedDataStack().peek();
+        if (curData instanceof YangModule || curData instanceof YangSubModule || curData instanceof YangUses) {
+            YangNode curNode = (YangNode) curData;
+            YangAugment yangAugment = getYangAugmentNode(JAVA_GENERATION);
+
+            //validateTargetNodePath(targetNodes, curNode, ctx);
+            // TODO: handle in linker.
+
+            yangAugment.setTargetNode(targetNodes);
+            yangAugment.setName(generateNameForAugmentNode(curData, targetNodes, listener));
+
+            try {
+                curNode.addChild(yangAugment);
+            } catch (DataModelException e) {
+                throw new ParserException(constructExtendedListenerErrorMessage(UNHANDLED_PARSED_DATA,
+                        AUGMENT_DATA, ctx.augment().getText(), ENTRY, e.getMessage()));
+            }
+            listener.getParsedDataStack().push(yangAugment);
+        } else {
+            throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, AUGMENT_DATA,
+                    ctx.augment().getText(), ENTRY));
+        }
+
+    }
+
+    /**
+     * It is called when parser exits from grammar rule (augment), it perform
+     * validations and updates the data model tree.
+     *
+     * @param listener listener's object
+     * @param ctx context object of the grammar rule
+     */
+    public static void processAugmentExit(TreeWalkListener listener,
+            GeneratedYangParser.AugmentStatementContext ctx) {
+
+        //Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, AUGMENT_DATA, ctx.augment().getText(), EXIT);
+
+        if (!(listener.getParsedDataStack().peek() instanceof YangAugment)) {
+            throw new ParserException(constructListenerErrorMessage(MISSING_CURRENT_HOLDER, AUGMENT_DATA,
+                    ctx.augment().getText(), EXIT));
+        }
+        listener.getParsedDataStack().pop();
+    }
+
+    /**
+     * Validates the cardinality of augment sub-statements as per grammar.
+     *
+     * @param ctx context object of the grammar rule
+     */
+    private static void validateSubStatementsCardinality(GeneratedYangParser.AugmentStatementContext ctx) {
+        validateCardinalityMaxOne(ctx.statusStatement(), STATUS_DATA, AUGMENT_DATA, ctx.augment().getText());
+        validateCardinalityMaxOne(ctx.descriptionStatement(), DESCRIPTION_DATA, AUGMENT_DATA, ctx.augment().getText());
+        validateCardinalityMaxOne(ctx.referenceStatement(), REFERENCE_DATA, AUGMENT_DATA, ctx.augment().getText());
+        validateCardinalityMaxOne(ctx.whenStatement(), WHEN_DATA, AUGMENT_DATA, ctx.augment().getText());
+        validateMutuallyExclusiveChilds(ctx.dataDefStatement(), DATA_DEF_DATA, ctx.caseStatement(),
+                CASE_DATA, AUGMENT_DATA, ctx.augment().getText());
+    }
+
+    /**
+     * Validates whether the current target node path is correct or not.
+     *
+     * @param targetNodes list of target nodes
+     * @param curNode current Node
+     * @param ctx augment context
+     * @param curNode current YANG node
+     */
+    private static void validateTargetNodePath(List<YangNodeIdentifier> targetNodes, YangNode curNode,
+            GeneratedYangParser.AugmentStatementContext ctx) {
+
+        YangNodeIdentifier moduleId = targetNodes.get(0);
+        if (moduleId.getPrefix() == null) {
+            if (!moduleId.getName().equals(curNode.getName())) {
+                throw parserException(ctx);
+            } else {
+                //validateNodeInTargetPath(curNode, targetNodes, ctx);
+                // TODO: handle in linker.
+            }
+        } else {
+            String parentPrefix = getParentsPrefix(curNode);
+            if (parentPrefix != null) {
+                if (!parentPrefix.equals(moduleId.getPrefix())) {
+                    // TODO: handle in linker.
+                } else {
+                    validateNodeInTargetPath(curNode, targetNodes, ctx);
+                }
+            } else {
+                // TODO: handle in linker.
+            }
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/BaseFileListener.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/BaseFileListener.java
new file mode 100644
index 0000000..8ba4d02
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/BaseFileListener.java
@@ -0,0 +1,93 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangSubModule;
+import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.TreeWalkListener;
+
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.YANGBASE_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.ENTRY;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.EXIT;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_CHILD;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsEmpty;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty;
+
+/*
+ * Reference: RFC6020 and YANG ANTLR Grammar
+ *
+ * ANTLR grammar rule
+ * yangfile : module_stmt
+ *          | submodule_stmt;
+ */
+
+/**
+ * Representation of call back function corresponding to the "base rule" defined in
+ * ANTLR grammar file.
+ */
+public final class BaseFileListener {
+
+    /**
+     * Creates a new base listener.
+     */
+    private BaseFileListener() {
+    }
+
+    /**
+     * It is called when parser receives an input matching the grammar rule
+     * (yangfile), perform validations and update the data model tree.
+     *
+     * @param listener Listener's object
+     * @param ctx context object of the grammar rule
+     */
+    public static void processYangFileEntry(TreeWalkListener listener, GeneratedYangParser.YangfileContext ctx) {
+
+        // Check if stack is empty.
+        checkStackIsEmpty(listener, INVALID_HOLDER, YANGBASE_DATA, "", ENTRY);
+
+    }
+
+    /**
+     * It is called when parser exits from grammar rule (yangfile), it perform
+     * validations and update the data model tree.
+     *
+     * @param listener Listener's object
+     * @param ctx context object of the grammar rule
+     */
+    public static void processYangFileExit(TreeWalkListener listener, GeneratedYangParser.YangfileContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, YANGBASE_DATA, "", EXIT);
+
+        // Data Model tree root node is set.
+        if (listener.getParsedDataStack().peek() instanceof YangModule
+                || listener.getParsedDataStack().peek() instanceof YangSubModule) {
+            listener.setRootNode((YangNode) listener.getParsedDataStack().pop());
+        } else {
+            throw new ParserException(constructListenerErrorMessage(INVALID_CHILD, YANGBASE_DATA, "", EXIT));
+        }
+
+        // Check if stack is empty.
+        checkStackIsEmpty(listener, INVALID_HOLDER, YANGBASE_DATA, "", EXIT);
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/BelongsToListener.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/BelongsToListener.java
new file mode 100644
index 0000000..ab12d46
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/BelongsToListener.java
@@ -0,0 +1,141 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import org.onosproject.yangutils.datamodel.YangBelongsTo;
+import org.onosproject.yangutils.datamodel.YangSubModule;
+import org.onosproject.yangutils.datamodel.utils.Parsable;
+import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.TreeWalkListener;
+
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.BELONGS_TO_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.ENTRY;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.EXIT;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_CURRENT_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerUtil.getValidIdentifier;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty;
+
+/*
+ * Reference: RFC6020 and YANG ANTLR Grammar
+ *
+ * ABNF grammar as per RFC6020
+ * submodule-header-stmts =
+ *                            ;; these stmts can appear in any order
+ *                            [yang-version-stmt stmtsep]
+ *                             belongs-to-stmt stmtsep
+ *
+ * belongs-to-stmt     = belongs-to-keyword sep identifier-arg-str
+ *                       optsep
+ *                       "{" stmtsep
+ *                           prefix-stmt stmtsep
+ *                       "}"
+ *
+ * ANTLR grammar rule
+ * submodule_header_statement : yang_version_stmt? belongs_to_stmt
+ *                            | belongs_to_stmt yang_version_stmt?
+ *                            ;
+ * belongs_to_stmt : BELONGS_TO_KEYWORD identifier LEFT_CURLY_BRACE belongs_to_stmt_body RIGHT_CURLY_BRACE;
+ * belongs_to_stmt_body : prefix_stmt;
+ */
+
+/**
+ * Represents listener based call back function corresponding to the
+ * "belongs to" rule defined in ANTLR grammar file for corresponding ABNF rule
+ * in RFC 6020.
+ */
+public final class BelongsToListener {
+
+    /**
+     * Creates a new belongto listener.
+     */
+    private BelongsToListener() {
+    }
+
+    /**
+     * It is called when parser receives an input matching the grammar rule
+     * (belongsto), perform validations and update the data model tree.
+     *
+     * @param listener Listener's object
+     * @param ctx      context object of the grammar rule
+     */
+    public static void processBelongsToEntry(TreeWalkListener listener,
+                                             GeneratedYangParser.BelongstoStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, BELONGS_TO_DATA, ctx.identifier().getText(),
+                ENTRY);
+
+        String identifier = getValidIdentifier(ctx.identifier().getText(), BELONGS_TO_DATA, ctx);
+
+        YangBelongsTo belongstoNode = new YangBelongsTo();
+        belongstoNode.setBelongsToModuleName(identifier);
+
+        // Set the line number and character position in line for the belongs to.
+        int errorLine = ctx.getStart().getLine();
+        int errorPosition = ctx.getStart().getCharPositionInLine();
+        belongstoNode.setLineNumber(errorLine);
+        belongstoNode.setCharPosition(errorPosition);
+
+        // Push belongsto into the stack.
+        listener.getParsedDataStack().push(belongstoNode);
+    }
+
+    /**
+     * It is called when parser exits from grammar rule (belongsto), it perform
+     * validations and update the data model tree.
+     *
+     * @param listener Listener's object
+     * @param ctx      context object of the grammar rule
+     */
+    public static void processBelongsToExit(TreeWalkListener listener,
+                                            GeneratedYangParser.BelongstoStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, BELONGS_TO_DATA, ctx.identifier().getText(),
+                EXIT);
+
+        Parsable tmpBelongstoNode = listener.getParsedDataStack().peek();
+        if (tmpBelongstoNode instanceof YangBelongsTo) {
+            listener.getParsedDataStack().pop();
+
+            // Check for stack to be empty.
+            checkStackIsNotEmpty(listener, MISSING_HOLDER, BELONGS_TO_DATA,
+                    ctx.identifier().getText(), EXIT);
+
+            Parsable tmpNode = listener.getParsedDataStack().peek();
+            switch (tmpNode.getYangConstructType()) {
+                case SUB_MODULE_DATA: {
+                    YangSubModule subModule = (YangSubModule) tmpNode;
+                    subModule.setBelongsTo((YangBelongsTo) tmpBelongstoNode);
+                    subModule.setPrefix(subModule.getBelongsTo().getPrefix());
+                    break;
+                }
+                default:
+                    throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, BELONGS_TO_DATA,
+                            ctx.identifier().getText(),
+                            EXIT));
+            }
+        } else {
+            throw new ParserException(constructListenerErrorMessage(MISSING_CURRENT_HOLDER, BELONGS_TO_DATA,
+                    ctx.identifier().getText(), EXIT));
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/BitListener.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/BitListener.java
new file mode 100644
index 0000000..39084e0
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/BitListener.java
@@ -0,0 +1,175 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+/*
+ * Reference: RFC6020 and YANG ANTLR Grammar
+ *
+ * ABNF grammar as per RFC6020
+ * bit-stmt            = bit-keyword sep identifier-arg-str optsep
+ *                       (";" /
+ *                        "{" stmtsep
+ *                            ;; these stmts can appear in any order
+ *                            [position-stmt stmtsep]
+ *                            [status-stmt stmtsep]
+ *                            [description-stmt stmtsep]
+ *                            [reference-stmt stmtsep]
+ *                          "}"
+ *                        "}")
+ *
+ * ANTLR grammar rule
+ * bitStatement : BIT_KEYWORD identifier (STMTEND | LEFT_CURLY_BRACE bitBodyStatement RIGHT_CURLY_BRACE);
+ *
+ * bitBodyStatement : positionStatement? statusStatement? descriptionStatement? referenceStatement?
+ *               | positionStatement? statusStatement? referenceStatement? descriptionStatement?
+ *               | positionStatement? descriptionStatement? statusStatement? referenceStatement?
+ *               | positionStatement? descriptionStatement? referenceStatement? statusStatement?
+ *               | positionStatement? referenceStatement? statusStatement? descriptionStatement?
+ *               | positionStatement? referenceStatement? descriptionStatement? statusStatement?
+ *               | statusStatement? positionStatement? descriptionStatement? referenceStatement?
+ *               | statusStatement? positionStatement? referenceStatement? descriptionStatement?
+ *               | statusStatement? descriptionStatement? descriptionStatement? positionStatement?
+ *               | statusStatement? descriptionStatement? positionStatement? descriptionStatement?
+ *               | statusStatement? referenceStatement? positionStatement? descriptionStatement?
+ *               | statusStatement? referenceStatement? descriptionStatement? positionStatement?
+ *               | descriptionStatement? positionStatement? statusStatement? referenceStatement?
+ *               | descriptionStatement? positionStatement? referenceStatement? statusStatement?
+ *               | descriptionStatement? statusStatement? positionStatement? referenceStatement?
+ *               | descriptionStatement? statusStatement? referenceStatement? positionStatement?
+ *               | descriptionStatement? referenceStatement? positionStatement? statusStatement?
+ *               | descriptionStatement? referenceStatement? statusStatement? positionStatement?
+ *               | referenceStatement? positionStatement? descriptionStatement? statusStatement?
+ *               | referenceStatement? positionStatement? statusStatement? descriptionStatement?
+ *               | referenceStatement? statusStatement? descriptionStatement? positionStatement?
+ *               | referenceStatement? statusStatement? positionStatement? descriptionStatement?
+ *               | referenceStatement? descriptionStatement? positionStatement? statusStatement?
+ *               | referenceStatement? descriptionStatement? statusStatement? positionStatement?
+ *               ;
+ */
+
+import org.onosproject.yangutils.datamodel.YangBit;
+import org.onosproject.yangutils.datamodel.YangBits;
+import org.onosproject.yangutils.datamodel.exceptions.DataModelException;
+import org.onosproject.yangutils.datamodel.utils.Parsable;
+import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.TreeWalkListener;
+
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerUtil.getValidIdentifier;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.BIT_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.ENTRY;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.EXIT;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructExtendedListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_CONTENT;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_CURRENT_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty;
+
+/**
+ * Represents listener based call back function corresponding to the "bit"
+ * rule defined in ANTLR grammar file for corresponding ABNF rule in RFC 6020.
+ */
+public final class BitListener {
+
+    /**
+     * Creates a new bit listener.
+     */
+    private BitListener() {
+    }
+
+    /**
+     * It is called when parser enters grammar rule (bit), it perform
+     * validations and updates the data model tree.
+     *
+     * @param listener listener's object
+     * @param ctx context object of the grammar rule
+     */
+    public static void processBitEntry(TreeWalkListener listener,
+                                        GeneratedYangParser.BitStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, BIT_DATA, ctx.identifier().getText(), ENTRY);
+
+        String identifier = getValidIdentifier(ctx.identifier().getText(), BIT_DATA, ctx);
+
+        YangBit bitNode = new YangBit();
+        bitNode.setBitName(identifier);
+        listener.getParsedDataStack().push(bitNode);
+    }
+
+    /**
+     * It is called when parser exits from grammar rule (bit), it perform
+     * validations and update the data model tree.
+     *
+     * @param listener Listener's object
+     * @param ctx context object of the grammar rule
+     */
+    public static void processBitExit(TreeWalkListener listener,
+                                       GeneratedYangParser.BitStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, BIT_DATA, ctx.identifier().getText(), EXIT);
+
+        Parsable tmpBitNode = listener.getParsedDataStack().peek();
+        if (tmpBitNode instanceof YangBit) {
+            listener.getParsedDataStack().pop();
+
+            // Check for stack to be non empty.
+            checkStackIsNotEmpty(listener, MISSING_HOLDER, BIT_DATA, ctx.identifier().getText(), EXIT);
+
+            Parsable tmpNode = listener.getParsedDataStack().peek();
+            switch (tmpNode.getYangConstructType()) {
+                case BITS_DATA: {
+                    YangBits yangBits = (YangBits) tmpNode;
+                    if (ctx.bitBodyStatement() == null || ctx.bitBodyStatement().positionStatement() == null) {
+                        int maxPosition = 0;
+                        boolean isPositionPresent = false;
+
+                        for (YangBit curBit : yangBits.getBitSet()) {
+                            if (maxPosition <= curBit.getPosition()) {
+                                maxPosition = curBit.getPosition();
+                                isPositionPresent = true;
+                            }
+                        }
+                        if (isPositionPresent) {
+                            maxPosition++;
+                        }
+                        ((YangBit) tmpBitNode).setPosition(maxPosition);
+                    }
+                    try {
+                        yangBits.addBitInfo((YangBit) tmpBitNode);
+                    } catch (DataModelException e) {
+                        ParserException parserException = new ParserException(constructExtendedListenerErrorMessage(
+                                INVALID_CONTENT, BIT_DATA, ctx.identifier().getText(), EXIT, e.getMessage()));
+                        parserException.setLine(ctx.getStart().getLine());
+                        parserException.setCharPosition(ctx.getStart().getCharPositionInLine());
+                        throw parserException;
+                    }
+                    break;
+                }
+                default:
+                    throw new ParserException(
+                            constructListenerErrorMessage(INVALID_HOLDER, BIT_DATA, ctx.identifier().getText(), EXIT));
+            }
+        } else {
+            throw new ParserException(
+                    constructListenerErrorMessage(MISSING_CURRENT_HOLDER, BIT_DATA, ctx.identifier().getText(), EXIT));
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/BitsListener.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/BitsListener.java
new file mode 100644
index 0000000..c53a516
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/BitsListener.java
@@ -0,0 +1,161 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+/*
+ * Reference: RFC6020 and YANG ANTLR Grammar
+ *
+ * ABNF grammar as per RFC6020
+ * type-body-stmts     = numerical-restrictions /
+ *                       decimal64-specification /
+ *                      string-restrictions /
+ *                       enum-specification /
+ *                       leafref-specification /
+ *                       identityref-specification /
+ *                       instance-identifier-specification /
+ *                       bits-specification /
+ *                       union-specification
+ *
+ * bits-specification  = 1*(bit-stmt stmtsep)
+ *
+ * ANTLR grammar rule
+ *
+ * typeBodyStatements : numericalRestrictions | stringRestrictions | enumSpecification
+ *                 | leafrefSpecification | identityrefSpecification | instanceIdentifierSpecification
+ *                 | bitsSpecification | unionSpecification;
+ *
+ * bitsSpecification : bitStatement+;
+ */
+
+import org.onosproject.yangutils.datamodel.YangBits;
+import org.onosproject.yangutils.datamodel.YangLeaf;
+import org.onosproject.yangutils.datamodel.YangLeafList;
+import org.onosproject.yangutils.datamodel.YangType;
+import org.onosproject.yangutils.datamodel.YangTypeDef;
+import org.onosproject.yangutils.datamodel.YangUnion;
+import org.onosproject.yangutils.datamodel.utils.Parsable;
+import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.TreeWalkListener;
+
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.BITS_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.TYPE_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.ENTRY;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.EXIT;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_CURRENT_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty;
+
+/**
+ * Represents listener based call back function corresponding to the "bits" rule
+ * defined in ANTLR grammar file for corresponding ABNF rule in RFC 6020.
+ */
+public final class BitsListener {
+
+    /**
+     * Creates a new bits listener.
+     */
+    private BitsListener() {
+    }
+
+    /**
+     * It is called when parser enters grammar rule (bits), it perform
+     * validations and updates the data model tree.
+     *
+     * @param listener listener's object
+     * @param ctx context object of the grammar rule
+     */
+    public static void processBitsEntry(TreeWalkListener listener,
+            GeneratedYangParser.BitsSpecificationContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, BITS_DATA, "", ENTRY);
+
+        if (listener.getParsedDataStack().peek() instanceof YangType) {
+            YangBits bitsNode = new YangBits();
+            Parsable typeData = listener.getParsedDataStack().pop();
+
+            // Check for stack to be non empty.
+            checkStackIsNotEmpty(listener, MISSING_HOLDER, BITS_DATA, "", ENTRY);
+
+            Parsable tmpData = listener.getParsedDataStack().peek();
+
+            switch (tmpData.getYangConstructType()) {
+                case LEAF_DATA:
+                    bitsNode.setBitsName(((YangLeaf) tmpData).getName());
+                    break;
+                case LEAF_LIST_DATA:
+                    bitsNode.setBitsName(((YangLeafList) tmpData).getName());
+                    break;
+                case TYPEDEF_DATA:
+                    bitsNode.setBitsName(((YangTypeDef) tmpData).getName());
+                    break;
+                case UNION_DATA:
+                    bitsNode.setBitsName(((YangUnion) tmpData).getName());
+                    break;
+                // TODO typedef, union, deviate.
+                default:
+                    throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, TYPE_DATA,
+                            ((YangType<?>) typeData).getDataTypeName(), ENTRY));
+            }
+            listener.getParsedDataStack().push(typeData);
+            listener.getParsedDataStack().push(bitsNode);
+        } else {
+            throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, BITS_DATA, "", ENTRY));
+        }
+    }
+
+    /**
+     * It is called when parser exits from grammar rule (bits), it perform
+     * validations and update the data model tree.
+     *
+     * @param listener Listener's object
+     * @param ctx context object of the grammar rule
+     */
+    public static void processBitsExit(TreeWalkListener listener,
+            GeneratedYangParser.BitsSpecificationContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, BITS_DATA, "", EXIT);
+
+        Parsable tmpBitsNode = listener.getParsedDataStack().peek();
+        if (tmpBitsNode instanceof YangBits) {
+            YangBits bitsNode = (YangBits) tmpBitsNode;
+            listener.getParsedDataStack().pop();
+
+            // Check for stack to be non empty.
+            checkStackIsNotEmpty(listener, MISSING_HOLDER, BITS_DATA, "", EXIT);
+
+            Parsable tmpNode = listener.getParsedDataStack().peek();
+            switch (tmpNode.getYangConstructType()) {
+                case TYPE_DATA: {
+                    YangType<YangBits> typeNode = (YangType<YangBits>) tmpNode;
+                    typeNode.setDataTypeExtendedInfo(bitsNode);
+                    break;
+                }
+                default:
+                    throw new ParserException(
+                            constructListenerErrorMessage(INVALID_HOLDER, BITS_DATA, "", EXIT));
+            }
+        } else {
+            throw new ParserException(
+                    constructListenerErrorMessage(MISSING_CURRENT_HOLDER, BITS_DATA, "", EXIT));
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/CaseListener.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/CaseListener.java
new file mode 100644
index 0000000..5aa1dcd
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/CaseListener.java
@@ -0,0 +1,157 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import org.onosproject.yangutils.datamodel.YangCase;
+import org.onosproject.yangutils.datamodel.YangChoice;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.exceptions.DataModelException;
+import org.onosproject.yangutils.datamodel.utils.Parsable;
+import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.TreeWalkListener;
+
+import static org.onosproject.yangutils.datamodel.utils.GeneratedLanguage.JAVA_GENERATION;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.CASE_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.DESCRIPTION_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.REFERENCE_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.STATUS_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.WHEN_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerCollisionDetector.detectCollidingChildUtil;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.ENTRY;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.EXIT;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructExtendedListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_CURRENT_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.UNHANDLED_PARSED_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerUtil.getValidIdentifier;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.validateCardinalityMaxOne;
+import static org.onosproject.yangutils.translator.tojava.YangDataModelFactory.getYangCaseNode;
+
+/*
+ * Reference: RFC6020 and YANG ANTLR Grammar
+ *
+ * ABNF grammar as per RFC6020
+ *  case-stmt           = case-keyword sep identifier-arg-str optsep
+ *                        (";" /
+ *                         "{" stmtsep
+ *                             ;; these stmts can appear in any order
+ *                             [when-stmt stmtsep]
+ *                             *(if-feature-stmt stmtsep)
+ *                             [status-stmt stmtsep]
+ *                             [description-stmt stmtsep]
+ *                             [reference-stmt stmtsep]
+ *                             *(data-def-stmt stmtsep)
+ *                         "}")
+ *
+ * ANTLR grammar rule
+ * caseStatement : CASE_KEYWORD identifier (STMTEND | LEFT_CURLY_BRACE (whenStatement | ifFeatureStatement
+ *               | statusStatement | descriptionStatement | referenceStatement | dataDefStatement)* RIGHT_CURLY_BRACE);
+ */
+
+/**
+ * Represents listener based call back function corresponding to the "case" rule
+ * defined in ANTLR grammar file for corresponding ABNF rule in RFC 6020.
+ */
+public final class CaseListener {
+
+    /**
+     * Create a new case listener.
+     */
+    private CaseListener() {
+    }
+
+    /**
+     * It is called when parser enters grammar rule (case), it perform
+     * validations and updates the data model tree.
+     *
+     * @param listener listener's object
+     * @param ctx context object of the grammar rule
+     */
+    public static void processCaseEntry(TreeWalkListener listener,
+            GeneratedYangParser.CaseStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, CASE_DATA, ctx.identifier().getText(), ENTRY);
+
+        // Check validity of identifier and remove double quotes.
+        String identifier = getValidIdentifier(ctx.identifier().getText(), CASE_DATA, ctx);
+
+        // Validate sub statement cardinality.
+        validateSubStatementsCardinality(ctx);
+
+        Parsable curData = listener.getParsedDataStack().peek();
+
+        // Check for identifier collision
+        int line = ctx.getStart().getLine();
+        int charPositionInLine = ctx.getStart().getCharPositionInLine();
+        detectCollidingChildUtil(listener, line, charPositionInLine, identifier, CASE_DATA);
+
+        if (curData instanceof YangChoice) {
+            YangCase caseNode = getYangCaseNode(JAVA_GENERATION);
+            caseNode.setName(identifier);
+            YangNode curNode = (YangNode) curData;
+            try {
+                curNode.addChild(caseNode);
+            } catch (DataModelException e) {
+                throw new ParserException(constructExtendedListenerErrorMessage(UNHANDLED_PARSED_DATA,
+                        CASE_DATA, ctx.identifier().getText(), ENTRY, e.getMessage()));
+            }
+            listener.getParsedDataStack().push(caseNode);
+        } else {
+            throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, CASE_DATA,
+                    ctx.identifier().getText(), ENTRY));
+        }
+    }
+
+    /**
+     * It is called when parser exits from grammar rule (case), it perform
+     * validations and update the data model tree.
+     *
+     * @param listener Listener's object
+     * @param ctx context object of the grammar rule
+     */
+    public static void processCaseExit(TreeWalkListener listener,
+            GeneratedYangParser.CaseStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, CASE_DATA, ctx.identifier().getText(), EXIT);
+
+        if (listener.getParsedDataStack().peek() instanceof YangCase) {
+            listener.getParsedDataStack().pop();
+        } else {
+            throw new ParserException(constructListenerErrorMessage(MISSING_CURRENT_HOLDER, CASE_DATA,
+                    ctx.identifier().getText(), EXIT));
+        }
+    }
+
+    /**
+     * Validates the cardinality of case sub-statements as per grammar.
+     *
+     * @param ctx context object of the grammar rule
+     */
+    private static void validateSubStatementsCardinality(GeneratedYangParser.CaseStatementContext ctx) {
+
+        validateCardinalityMaxOne(ctx.whenStatement(), WHEN_DATA, CASE_DATA, ctx.identifier().getText());
+        validateCardinalityMaxOne(ctx.statusStatement(), STATUS_DATA, CASE_DATA, ctx.identifier().getText());
+        validateCardinalityMaxOne(ctx.descriptionStatement(), DESCRIPTION_DATA, CASE_DATA, ctx.identifier().getText());
+        validateCardinalityMaxOne(ctx.referenceStatement(), REFERENCE_DATA, CASE_DATA, ctx.identifier().getText());
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/ChoiceListener.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/ChoiceListener.java
new file mode 100644
index 0000000..61c2df1
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/ChoiceListener.java
@@ -0,0 +1,187 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import org.onosproject.yangutils.datamodel.YangAugment;
+import org.onosproject.yangutils.datamodel.YangCase;
+import org.onosproject.yangutils.datamodel.YangChoice;
+import org.onosproject.yangutils.datamodel.YangContainer;
+import org.onosproject.yangutils.datamodel.YangGrouping;
+import org.onosproject.yangutils.datamodel.YangInput;
+import org.onosproject.yangutils.datamodel.YangList;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangNotification;
+import org.onosproject.yangutils.datamodel.YangOutput;
+import org.onosproject.yangutils.datamodel.YangSubModule;
+import org.onosproject.yangutils.datamodel.exceptions.DataModelException;
+import org.onosproject.yangutils.datamodel.utils.Parsable;
+import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.TreeWalkListener;
+
+import static org.onosproject.yangutils.datamodel.utils.GeneratedLanguage.JAVA_GENERATION;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.CASE_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.CHOICE_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.CONFIG_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.DEFAULT_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.DESCRIPTION_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.MANDATORY_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.REFERENCE_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.SHORT_CASE_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.STATUS_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.WHEN_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerCollisionDetector.detectCollidingChildUtil;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.ENTRY;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.EXIT;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructExtendedListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_CURRENT_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.UNHANDLED_PARSED_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerUtil.getValidIdentifier;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.validateCardinalityMaxOne;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.validateMutuallyExclusiveChilds;
+import static org.onosproject.yangutils.translator.tojava.YangDataModelFactory.getYangChoiceNode;
+
+/*
+ * Reference: RFC6020 and YANG ANTLR Grammar
+ *
+ * ABNF grammar as per RFC6020
+ *  choice-stmt         = choice-keyword sep identifier-arg-str optsep
+ *                        (";" /
+ *                         "{" stmtsep
+ *                             ;; these stmts can appear in any order
+ *                             [when-stmt stmtsep]
+ *                             *(if-feature-stmt stmtsep)
+ *                             [default-stmt stmtsep]
+ *                             [config-stmt stmtsep]
+ *                             [mandatory-stmt stmtsep]
+ *                             [status-stmt stmtsep]
+ *                             [description-stmt stmtsep]
+ *                             [reference-stmt stmtsep]
+ *                             *((short-case-stmt / case-stmt) stmtsep)
+ *                         "}")
+ *
+ * ANTLR grammar rule
+ * choiceStatement : CHOICE_KEYWORD identifier (STMTEND | LEFT_CURLY_BRACE (whenStatement | ifFeatureStatement
+ *                 | defaultStatement | configStatement | mandatoryStatement | statusStatement | descriptionStatement
+ *                 | referenceStatement | shortCaseStatement | caseStatement)* RIGHT_CURLY_BRACE);
+ */
+
+/**
+ * Represents listener based call back function corresponding to the "choice"
+ * rule defined in ANTLR grammar file for corresponding ABNF rule in RFC 6020.
+ */
+public final class ChoiceListener {
+
+    /**
+     * Create a new choice listener.
+     */
+    private ChoiceListener() {
+    }
+
+    /**
+     * It is called when parser receives an input matching the grammar rule
+     * (choice), perform validations and update the data model tree.
+     *
+     * @param listener Listener's object
+     * @param ctx context object of the grammar rule
+     */
+    public static void processChoiceEntry(TreeWalkListener listener,
+            GeneratedYangParser.ChoiceStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, CHOICE_DATA, ctx.identifier().getText(), ENTRY);
+
+        // Check validity of identifier and remove double quotes.
+        String identifier = getValidIdentifier(ctx.identifier().getText(), CHOICE_DATA, ctx);
+
+        // Validate sub statement cardinality.
+        validateSubStatementsCardinality(ctx);
+
+        Parsable curData = listener.getParsedDataStack().peek();
+
+        // Check for identifier collision
+        int line = ctx.getStart().getLine();
+        int charPositionInLine = ctx.getStart().getCharPositionInLine();
+        detectCollidingChildUtil(listener, line, charPositionInLine, identifier, CHOICE_DATA);
+
+        if (curData instanceof YangModule || curData instanceof YangSubModule || curData instanceof YangContainer
+                || curData instanceof YangList || curData instanceof YangCase || curData instanceof YangGrouping
+                || curData instanceof YangAugment  || curData instanceof YangInput || curData instanceof YangOutput
+                || curData instanceof YangNotification) {
+
+            YangChoice choiceNode = getYangChoiceNode(JAVA_GENERATION);
+            choiceNode.setName(identifier);
+
+            YangNode curNode = (YangNode) curData;
+            try {
+                curNode.addChild(choiceNode);
+            } catch (DataModelException e) {
+                throw new ParserException(constructExtendedListenerErrorMessage(UNHANDLED_PARSED_DATA,
+                        CHOICE_DATA, ctx.identifier().getText(), ENTRY, e.getMessage()));
+            }
+            listener.getParsedDataStack().push(choiceNode);
+        } else {
+            throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER,
+                    CHOICE_DATA, ctx.identifier().getText(), ENTRY));
+        }
+    }
+
+    /**
+     * It is called when parser exits from grammar rule (choice), it perform
+     * validations and update the data model tree.
+     *
+     * @param listener Listener's object
+     * @param ctx context object of the grammar rule
+     */
+    public static void processChoiceExit(TreeWalkListener listener,
+            GeneratedYangParser.ChoiceStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, CHOICE_DATA, ctx.identifier().getText(), EXIT);
+
+        if (listener.getParsedDataStack().peek() instanceof YangChoice) {
+            listener.getParsedDataStack().pop();
+        } else {
+            throw new ParserException(constructListenerErrorMessage(MISSING_CURRENT_HOLDER, CHOICE_DATA,
+                    ctx.identifier().getText(), EXIT));
+        }
+    }
+
+    /**
+     * Validates the cardinality of choice sub-statements as per grammar.
+     *
+     * @param ctx context object of the grammar rule.
+     */
+    private static void validateSubStatementsCardinality(GeneratedYangParser.ChoiceStatementContext ctx) {
+
+        validateCardinalityMaxOne(ctx.whenStatement(), WHEN_DATA, CHOICE_DATA, ctx.identifier().getText());
+        validateCardinalityMaxOne(ctx.defaultStatement(), DEFAULT_DATA, CHOICE_DATA, ctx.identifier().getText());
+        validateCardinalityMaxOne(ctx.configStatement(), CONFIG_DATA, CHOICE_DATA, ctx.identifier().getText());
+        validateCardinalityMaxOne(ctx.mandatoryStatement(), MANDATORY_DATA, CHOICE_DATA, ctx.identifier().getText());
+        validateCardinalityMaxOne(ctx.statusStatement(), STATUS_DATA, CHOICE_DATA, ctx.identifier().getText());
+        validateCardinalityMaxOne(ctx.descriptionStatement(), DESCRIPTION_DATA, CHOICE_DATA,
+                ctx.identifier().getText());
+        validateCardinalityMaxOne(ctx.referenceStatement(), REFERENCE_DATA, CHOICE_DATA, ctx.identifier().getText());
+        validateMutuallyExclusiveChilds(ctx.shortCaseStatement(), SHORT_CASE_DATA, ctx.caseStatement(), CASE_DATA,
+                CHOICE_DATA, ctx.identifier().getText());
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/ConfigListener.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/ConfigListener.java
new file mode 100644
index 0000000..d595cb0
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/ConfigListener.java
@@ -0,0 +1,102 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import org.onosproject.yangutils.datamodel.YangContainer;
+import org.onosproject.yangutils.datamodel.YangLeaf;
+import org.onosproject.yangutils.datamodel.YangLeafList;
+import org.onosproject.yangutils.datamodel.YangList;
+import org.onosproject.yangutils.datamodel.utils.Parsable;
+import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.TreeWalkListener;
+
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.CONFIG_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.ENTRY;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerUtil.getValidBooleanValue;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty;
+
+/*
+ * Reference: RFC6020 and YANG ANTLR Grammar
+ *
+ * ABNF grammar as per RFC6020
+ * config-stmt         = config-keyword sep
+ *                       config-arg-str stmtend
+ * config-arg-str      = < a string that matches the rule
+ *                         config-arg >
+ * config-arg          = true-keyword / false-keyword
+ *
+ * ANTLR grammar rule
+ * configStatement : CONFIG_KEYWORD config STMTEND;
+ * config          : string;
+ */
+
+/**
+ * Represents listener based call back function corresponding to the "config"
+ * rule defined in ANTLR grammar file for corresponding ABNF rule in RFC 6020.
+ */
+public final class ConfigListener {
+
+    /**
+     * Creates a new config listener.
+     */
+    private ConfigListener() {
+    }
+
+    /**
+     * It is called when parser receives an input matching the grammar rule
+     * (config), performs validation and updates the data model tree.
+     *
+     * @param listener listener's object
+     * @param ctx context object of the grammar rule
+     */
+    public static void processConfigEntry(TreeWalkListener listener,
+            GeneratedYangParser.ConfigStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, CONFIG_DATA, "", ENTRY);
+
+        boolean isConfig = getValidBooleanValue(ctx.config().getText(), CONFIG_DATA, ctx);
+
+        Parsable tmpData = listener.getParsedDataStack().peek();
+        switch (tmpData.getYangConstructType()) {
+            case LEAF_DATA:
+                YangLeaf leaf = (YangLeaf) tmpData;
+                leaf.setConfig(isConfig);
+                break;
+            case CONTAINER_DATA:
+                YangContainer container = (YangContainer) tmpData;
+                container.setConfig(isConfig);
+                break;
+            case LEAF_LIST_DATA:
+                YangLeafList leafList = (YangLeafList) tmpData;
+                leafList.setConfig(isConfig);
+                break;
+            case LIST_DATA:
+                YangList yangList = (YangList) tmpData;
+                yangList.setConfig(isConfig);
+                break;
+            case CHOICE_DATA: // TODO
+                break;
+            default:
+                throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, CONFIG_DATA, "", ENTRY));
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/ContactListener.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/ContactListener.java
new file mode 100644
index 0000000..4cab95d
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/ContactListener.java
@@ -0,0 +1,115 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangSubModule;
+import org.onosproject.yangutils.datamodel.utils.Parsable;
+import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.TreeWalkListener;
+
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.CONTACT_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.ENTRY;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty;
+
+/*
+ * Reference: RFC6020 and YANG ANTLR Grammar
+ *
+ * ABNF grammar as per RFC6020
+ * meta-stmts          = ;; these stmts can appear in any order
+ *                       [organization-stmt stmtsep]
+ *                       [contact-stmt stmtsep]
+ *                       [description-stmt stmtsep]
+ *                       [reference-stmt stmtsep]
+ * contact-stmt        = contact-keyword sep string optsep stmtend
+ *
+ * ANTLR grammar rule
+ * meta_stmts : organization_stmt? contact_stmt? description_stmt? reference_stmt?
+ *            | organization_stmt? contact_stmt? reference_stmt? description_stmt?
+ *            | organization_stmt? description_stmt? contact_stmt? reference_stmt?
+ *            | organization_stmt? description_stmt? reference_stmt? contact_stmt?
+ *            | organization_stmt? reference_stmt? contact_stmt? description_stmt?
+ *            | organization_stmt? reference_stmt? description_stmt? contact_stmt?
+ *            | contact_stmt? organization_stmt? description_stmt? reference_stmt?
+ *            | contact_stmt? organization_stmt? reference_stmt? description_stmt?
+ *            | contact_stmt? reference_stmt? organization_stmt? description_stmt?
+ *            | contact_stmt? reference_stmt? description_stmt? organization_stmt?
+ *            | contact_stmt? description_stmt? reference_stmt? organization_stmt?
+ *            | contact_stmt? description_stmt? organization_stmt? reference_stmt?
+ *            | reference_stmt? contact_stmt? organization_stmt? description_stmt?
+ *            | reference_stmt? contact_stmt? description_stmt? organization_stmt?
+ *            | reference_stmt? organization_stmt? contact_stmt? description_stmt?
+ *            | reference_stmt? organization_stmt? description_stmt? contact_stmt?
+ *            | reference_stmt? description_stmt? organization_stmt? contact_stmt?
+ *            | reference_stmt? description_stmt? contact_stmt? organization_stmt?
+ *            | description_stmt? reference_stmt? contact_stmt? organization_stmt?
+ *            | description_stmt? reference_stmt? organization_stmt? contact_stmt?
+ *            | description_stmt? contact_stmt? reference_stmt? organization_stmt?
+ *            | description_stmt? contact_stmt? organization_stmt? reference_stmt?
+ *            | description_stmt? organization_stmt? contact_stmt? reference_stmt?
+ *            | description_stmt? organization_stmt? reference_stmt? contact_stmt?
+ *            ;
+ * contact_stmt : CONTACT_KEYWORD string STMTEND;
+ */
+
+/**
+ * Represents listener based call back function corresponding to the "contact"
+ * rule defined in ANTLR grammar file for corresponding ABNF rule in RFC 6020.
+ */
+public final class ContactListener {
+
+    /**
+     * Creates a new contact listener.
+     */
+    private ContactListener() {
+    }
+
+    /**
+     * It is called when parser receives an input matching the grammar rule
+     * (contact), perform validations and update the data model tree.
+     *
+     * @param listener Listener's object
+     * @param ctx context object of the grammar rule
+     */
+    public static void processContactEntry(TreeWalkListener listener, GeneratedYangParser.ContactStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, CONTACT_DATA, ctx.string().getText(), ENTRY);
+
+        // Obtain the node of the stack.
+        Parsable tmpNode = listener.getParsedDataStack().peek();
+        switch (tmpNode.getYangConstructType()) {
+            case MODULE_DATA: {
+                YangModule module = (YangModule) tmpNode;
+                module.setContact(ctx.string().getText());
+                break;
+            }
+            case SUB_MODULE_DATA: {
+                YangSubModule subModule = (YangSubModule) tmpNode;
+                subModule.setContact(ctx.string().getText());
+                break;
+            }
+            default:
+                throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, CONTACT_DATA,
+                        ctx.string().getText(), ENTRY));
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/ContainerListener.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/ContainerListener.java
new file mode 100644
index 0000000..9ed3e76
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/ContainerListener.java
@@ -0,0 +1,199 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import org.onosproject.yangutils.datamodel.YangAugment;
+import org.onosproject.yangutils.datamodel.YangCase;
+import org.onosproject.yangutils.datamodel.YangContainer;
+import org.onosproject.yangutils.datamodel.YangGrouping;
+import org.onosproject.yangutils.datamodel.YangInput;
+import org.onosproject.yangutils.datamodel.YangList;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangNotification;
+import org.onosproject.yangutils.datamodel.YangOutput;
+import org.onosproject.yangutils.datamodel.YangSubModule;
+import org.onosproject.yangutils.datamodel.exceptions.DataModelException;
+import org.onosproject.yangutils.datamodel.utils.Parsable;
+import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.TreeWalkListener;
+import org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation;
+
+import static org.onosproject.yangutils.datamodel.utils.GeneratedLanguage.JAVA_GENERATION;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.CONFIG_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.CONTAINER_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.DESCRIPTION_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.PRESENCE_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.REFERENCE_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.STATUS_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerCollisionDetector.detectCollidingChildUtil;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.ENTRY;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.EXIT;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction
+        .constructExtendedListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction
+        .constructListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_CURRENT_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.UNHANDLED_PARSED_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerUtil.getValidIdentifier;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.validateCardinalityMaxOne;
+import static org.onosproject.yangutils.translator.tojava.YangDataModelFactory.getYangContainerNode;
+
+/*
+ * Reference: RFC6020 and YANG ANTLR Grammar
+ *
+ * ABNF grammar as per RFC6020
+ *  container-stmt      = container-keyword sep identifier-arg-str optsep
+ *                        (";" /
+ *                         "{" stmtsep
+ *                             ;; these stmts can appear in any order
+ *                             [when-stmt stmtsep]
+ *                             *(if-feature-stmt stmtsep)
+ *                             *(must-stmt stmtsep)
+ *                             [presence-stmt stmtsep]
+ *                             [config-stmt stmtsep]
+ *                             [status-stmt stmtsep]
+ *                             [description-stmt stmtsep]
+ *                             [reference-stmt stmtsep]
+ *                             *((typedef-stmt /
+ *                                grouping-stmt) stmtsep)
+ *                             *(data-def-stmt stmtsep)
+ *                         "}")
+ *
+ * ANTLR grammar rule
+ *  containerStatement : CONTAINER_KEYWORD identifier
+ *                   (STMTEND | LEFT_CURLY_BRACE (whenStatement | ifFeatureStatement | mustStatement |
+ *                   presenceStatement | configStatement | statusStatement | descriptionStatement |
+ *                   referenceStatement | typedefStatement | groupingStatement
+ *                    | dataDefStatement)* RIGHT_CURLY_BRACE);
+ */
+
+/**
+ * Represents listener based call back function corresponding to the "container"
+ * rule defined in ANTLR grammar file for corresponding ABNF rule in RFC 6020.
+ */
+public final class ContainerListener {
+
+    /**
+     * Creates a new container listener.
+     */
+    private ContainerListener() {
+    }
+
+    /**
+     * It is called when parser receives an input matching the grammar rule
+     * (container), performs validation and updates the data model tree.
+     *
+     * @param listener listener's object
+     * @param ctx context object of the grammar rule
+     */
+    public static void processContainerEntry(TreeWalkListener listener,
+            GeneratedYangParser.ContainerStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, CONTAINER_DATA, ctx.identifier().getText(), ENTRY);
+
+        String identifier = getValidIdentifier(ctx.identifier().getText(), CONTAINER_DATA, ctx);
+
+        // Validate sub statement cardinality.
+        validateSubStatementsCardinality(ctx);
+
+        // Check for identifier collision
+        int line = ctx.getStart().getLine();
+        int charPositionInLine = ctx.getStart().getCharPositionInLine();
+        detectCollidingChildUtil(listener, line, charPositionInLine, identifier, CONTAINER_DATA);
+
+        YangContainer container = getYangContainerNode(JAVA_GENERATION);
+        container.setName(identifier);
+
+        /*
+         * If "config" is not specified, the default is the same as the parent
+         * schema node's "config" value.
+         */
+        if (ctx.configStatement().isEmpty()) {
+            boolean parentConfig = ListenerValidation.getParentNodeConfig(listener);
+            container.setConfig(parentConfig);
+        }
+
+        Parsable curData = listener.getParsedDataStack().peek();
+        if (curData instanceof YangModule || curData instanceof YangSubModule
+                || curData instanceof YangContainer || curData instanceof YangList
+                || curData instanceof YangCase || curData instanceof YangNotification
+                || curData instanceof YangInput || curData instanceof YangOutput
+                || curData instanceof YangAugment || curData instanceof YangGrouping) {
+            YangNode curNode = (YangNode) curData;
+            try {
+                curNode.addChild(container);
+            } catch (DataModelException e) {
+                throw new ParserException(constructExtendedListenerErrorMessage(UNHANDLED_PARSED_DATA,
+                        CONTAINER_DATA, ctx.identifier().getText(), ENTRY, e.getMessage()));
+            }
+            listener.getParsedDataStack().push(container);
+        } else {
+            throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, CONTAINER_DATA,
+                    ctx.identifier().getText(), ENTRY));
+        }
+    }
+
+    /**
+     * It is called when parser exits from grammar rule (container), it perform
+     * validations and updates the data model tree.
+     *
+     * @param listener listener's object
+     * @param ctx context object of the grammar rule
+     */
+    public static void processContainerExit(TreeWalkListener listener,
+            GeneratedYangParser.ContainerStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, CONTAINER_DATA, ctx.identifier().getText(), EXIT);
+
+        if (listener.getParsedDataStack().peek() instanceof YangContainer) {
+            YangContainer yangContainer = (YangContainer) listener.getParsedDataStack().peek();
+            try {
+                yangContainer.validateDataOnExit();
+            } catch (DataModelException e) {
+                throw new ParserException(constructExtendedListenerErrorMessage(UNHANDLED_PARSED_DATA,
+                        CONTAINER_DATA, ctx.identifier().getText(), EXIT, e.getMessage()));
+            }
+            listener.getParsedDataStack().pop();
+        } else {
+            throw new ParserException(constructListenerErrorMessage(MISSING_CURRENT_HOLDER, CONTAINER_DATA,
+                    ctx.identifier().getText(), EXIT));
+        }
+    }
+
+    /**
+     * Validates the cardinality of container sub-statements as per grammar.
+     *
+     * @param ctx context object of the grammar rule
+     */
+    private static void validateSubStatementsCardinality(GeneratedYangParser.ContainerStatementContext ctx) {
+
+        validateCardinalityMaxOne(ctx.presenceStatement(), PRESENCE_DATA, CONTAINER_DATA, ctx.identifier().getText());
+        validateCardinalityMaxOne(ctx.configStatement(), CONFIG_DATA, CONTAINER_DATA, ctx.identifier().getText());
+        validateCardinalityMaxOne(ctx.descriptionStatement(), DESCRIPTION_DATA, CONTAINER_DATA,
+                ctx.identifier().getText());
+        validateCardinalityMaxOne(ctx.referenceStatement(), REFERENCE_DATA, CONTAINER_DATA, ctx.identifier().getText());
+        validateCardinalityMaxOne(ctx.statusStatement(), STATUS_DATA, CONTAINER_DATA, ctx.identifier().getText());
+        // TODO validate 'when' cardinality
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/DefaultListener.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/DefaultListener.java
new file mode 100644
index 0000000..e07895f
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/DefaultListener.java
@@ -0,0 +1,103 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+/*
+ * Reference: RFC6020 and YANG ANTLR Grammar
+ *
+ * typedef-stmt        = typedef-keyword sep identifier-arg-str optsep
+ *                       "{" stmtsep
+ *                           ;; these stmts can appear in any order
+ *                           type-stmt stmtsep
+ *                          [units-stmt stmtsep]
+ *                           [default-stmt stmtsep]
+ *                           [status-stmt stmtsep]
+ *                           [description-stmt stmtsep]
+ *                           [reference-stmt stmtsep]
+ *                         "}"
+ * default-stmt        = default-keyword sep string stmtend
+
+ *
+ * ANTLR grammar rule
+ * typedefStatement : TYPEDEF_KEYWORD IDENTIFIER LEFT_CURLY_BRACE
+ *                (typeStatement | unitsStatement | defaultStatement | statusStatement
+ *                | descriptionStatement | referenceStatement)* RIGHT_CURLY_BRACE;
+ * defaultStatement : DEFAULT_KEYWORD string STMTEND;
+ */
+
+import org.onosproject.yangutils.datamodel.YangChoice;
+import org.onosproject.yangutils.datamodel.YangLeaf;
+import org.onosproject.yangutils.datamodel.YangTypeDef;
+import org.onosproject.yangutils.datamodel.utils.Parsable;
+import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.TreeWalkListener;
+
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.DEFAULT_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.ENTRY;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty;
+
+/**
+ * Represents listener for default YANG statement.
+ */
+public final class DefaultListener {
+
+    /**
+     * Creates a new default listener.
+     */
+    private DefaultListener() {
+    }
+
+    /**
+     * It is called when parser enters grammar rule (default), it perform
+     * validations and updates the data model tree.
+     *
+     * @param listener listener's object
+     * @param ctx context object of the grammar rule
+     */
+    public static void processDefaultEntry(TreeWalkListener listener,
+            GeneratedYangParser.DefaultStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, DEFAULT_DATA, ctx.string().getText(), ENTRY);
+
+        Parsable tmpNode = listener.getParsedDataStack().peek();
+        switch (tmpNode.getYangConstructType()) {
+            case TYPEDEF_DATA: {
+                YangTypeDef typeDef = (YangTypeDef) tmpNode;
+                typeDef.setDefaultValueInString(ctx.string().getText());
+                break;
+            }
+            case LEAF_DATA: {
+                YangLeaf leaf = (YangLeaf) tmpNode;
+                leaf.setDefaultValueInString(ctx.string().getText());
+                break;
+            }
+            case CHOICE_DATA: {
+                YangChoice choice = (YangChoice) tmpNode;
+                choice.setDefaultValueInString(ctx.string().getText());
+                break;
+            }
+            default:
+                throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER,
+                        DEFAULT_DATA, ctx.string().getText(), ENTRY));
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/DescriptionListener.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/DescriptionListener.java
new file mode 100644
index 0000000..c7988a8
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/DescriptionListener.java
@@ -0,0 +1,77 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import org.onosproject.yangutils.datamodel.YangDesc;
+import org.onosproject.yangutils.datamodel.utils.Parsable;
+import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.TreeWalkListener;
+
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.DESCRIPTION_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.ENTRY;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty;
+
+/*
+ * Reference: RFC6020 and YANG ANTLR Grammar
+ *
+ * ABNF grammar as per RFC6020
+ * description-stmt    = description-keyword sep string optsep stmtend
+ *
+ * ANTLR grammar rule
+ * descriptionStatement : DESCRIPTION_KEYWORD string STMTEND;
+ */
+
+/**
+ * Represents listener based call back function corresponding to the
+ * "description" rule defined in ANTLR grammar file for corresponding ABNF rule
+ * in RFC 6020.
+ */
+public final class DescriptionListener {
+
+    /**
+     * Creates a new description listener.
+     */
+    private DescriptionListener() {
+    }
+
+    /**
+     * It is called when parser receives an input matching the grammar rule
+     * (description), perform validations and updates the data model tree.
+     *
+     * @param listener listener's object
+     * @param ctx context object of the grammar rule
+     */
+    public static void processDescriptionEntry(TreeWalkListener listener,
+            GeneratedYangParser.DescriptionStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, DESCRIPTION_DATA, ctx.string().getText(), ENTRY);
+
+        Parsable tmpData = listener.getParsedDataStack().peek();
+        if (tmpData instanceof YangDesc) {
+            YangDesc description = (YangDesc) tmpData;
+            description.setDescription(ctx.string().getText());
+        } else {
+            throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, DESCRIPTION_DATA,
+                    ctx.string().getText(), ENTRY));
+        }
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/EnumListener.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/EnumListener.java
new file mode 100644
index 0000000..9cfc5aa
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/EnumListener.java
@@ -0,0 +1,186 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+/*
+ * Reference: RFC6020 and YANG ANTLR Grammar
+ *
+ * ABNF grammar as per RFC6020
+ *  enum-stmt           = enum-keyword sep string optsep
+ *                        (";" /
+ *                         "{" stmtsep
+ *                             ;; these stmts can appear in any order
+ *                             [value-stmt stmtsep]
+ *                             [status-stmt stmtsep]
+ *                             [description-stmt stmtsep]
+ *                             [reference-stmt stmtsep]
+ *                          "}")
+ *
+ * ANTLR grammar rule
+ * enumStatement : ENUM_KEYWORD string (STMTEND | LEFT_CURLY_BRACE enumStatementBody RIGHT_CURLY_BRACE);
+ *
+ *         enumStatementBody : valueStatement? statusStatement? descriptionStatement? referenceStatement?
+ *         | valueStatement? statusStatement? referenceStatement? descriptionStatement?
+ *         | valueStatement? descriptionStatement? statusStatement? referenceStatement?
+ *         | valueStatement? descriptionStatement? referenceStatement? statusStatement?
+ *         | valueStatement? referenceStatement? statusStatement? descriptionStatement?
+ *         | valueStatement? referenceStatement? descriptionStatement? statusStatement?
+ *         | statusStatement? valueStatement? descriptionStatement? referenceStatement?
+ *         | statusStatement? valueStatement? referenceStatement? descriptionStatement?
+ *         | statusStatement? descriptionStatement? descriptionStatement? valueStatement?
+ *         | statusStatement? descriptionStatement? valueStatement? descriptionStatement?
+ *         | statusStatement? referenceStatement? valueStatement? descriptionStatement?
+ *         | statusStatement? referenceStatement? descriptionStatement? valueStatement?
+ *         | descriptionStatement? valueStatement? statusStatement? referenceStatement?
+ *         | descriptionStatement? valueStatement? referenceStatement? statusStatement?
+ *         | descriptionStatement? statusStatement? valueStatement? referenceStatement?
+ *         | descriptionStatement? statusStatement? referenceStatement? valueStatement?
+ *         | descriptionStatement? referenceStatement? valueStatement? statusStatement?
+ *         | descriptionStatement? referenceStatement? statusStatement? valueStatement?
+ *         | referenceStatement? valueStatement? descriptionStatement? statusStatement?
+ *         | referenceStatement? valueStatement? statusStatement? descriptionStatement?
+ *         | referenceStatement? statusStatement? descriptionStatement? valueStatement?
+ *         | referenceStatement? statusStatement? valueStatement? descriptionStatement?
+ *         | referenceStatement? descriptionStatement? valueStatement? statusStatement?
+ *         | referenceStatement? descriptionStatement? statusStatement? valueStatement?
+ *         ;
+ */
+
+import org.onosproject.yangutils.datamodel.YangEnum;
+import org.onosproject.yangutils.datamodel.YangEnumeration;
+import org.onosproject.yangutils.datamodel.exceptions.DataModelException;
+import org.onosproject.yangutils.datamodel.utils.Parsable;
+import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.TreeWalkListener;
+
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.ENUM_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.ENTRY;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.EXIT;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructExtendedListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.DUPLICATE_ENTRY;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_CURRENT_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty;
+import static org.onosproject.yangutils.utils.UtilConstants.QUOTES;
+import static org.onosproject.yangutils.utils.UtilConstants.EMPTY_STRING;
+
+/**
+ * Represents listener based call back function corresponding to the "enum" rule
+ * defined in ANTLR grammar file for corresponding ABNF rule in RFC 6020.
+ */
+public final class EnumListener {
+
+    /**
+     * Creates a new enum listener.
+     */
+    private EnumListener() {
+    }
+
+    /**
+     * It is called when parser enters grammar rule (enum), it perform
+     * validations and updates the data model tree.
+     *
+     * @param listener listener's object
+     * @param ctx context object of the grammar rule
+     */
+    public static void processEnumEntry(TreeWalkListener listener, GeneratedYangParser.EnumStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, ENUM_DATA, ctx.string().getText(), ENTRY);
+
+        YangEnum enumNode = new YangEnum();
+        enumNode.setNamedValue(getValidNamedValue(ctx.string().getText()));
+        listener.getParsedDataStack().push(enumNode);
+    }
+
+    /*Removes quotes from the enum name if present.*/
+    private static String getValidNamedValue(String name) {
+        if (name.contains(QUOTES)) {
+            name = name.replace(QUOTES, EMPTY_STRING);
+        }
+        return name;
+    }
+
+    /**
+     * It is called when parser exits from grammar rule (enum), it perform
+     * validations and update the data model tree.
+     *
+     * @param listener Listener's object
+     * @param ctx context object of the grammar rule
+     */
+    public static void processEnumExit(TreeWalkListener listener, GeneratedYangParser.EnumStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, ENUM_DATA, ctx.string().getText(), EXIT);
+
+        Parsable tmpEnumNode = listener.getParsedDataStack().peek();
+        if (tmpEnumNode instanceof YangEnum) {
+            listener.getParsedDataStack().pop();
+
+            // Check for stack to be non empty.
+            checkStackIsNotEmpty(listener, MISSING_HOLDER, ENUM_DATA, ctx.string().getText(), EXIT);
+
+            Parsable tmpNode = listener.getParsedDataStack().peek();
+            switch (tmpNode.getYangConstructType()) {
+                case ENUMERATION_DATA: {
+                    YangEnumeration yangEnumeration = (YangEnumeration) tmpNode;
+                    if (ctx.enumStatementBody() == null || ctx.enumStatementBody().valueStatement() == null) {
+                        int maxValue = 0;
+                        boolean isValuePresent = false;
+
+                        for (YangEnum curEnum : yangEnumeration.getEnumSet()) {
+                            if (curEnum.getValue() == Integer.MAX_VALUE) {
+                                ParserException parserException = new ParserException("YANG file error : "
+                                        + "An enum value MUST be specified for enum substatements following the one"
+                                        + "with the current highest value");
+                                parserException.setLine(ctx.getStart().getLine());
+                                parserException.setCharPosition(ctx.getStart().getCharPositionInLine());
+                                throw parserException;
+                            } else if (maxValue <= curEnum.getValue()) {
+                                maxValue = curEnum.getValue();
+                                isValuePresent = true;
+                            }
+                        }
+                        if (isValuePresent) {
+                            maxValue++;
+                        }
+                        ((YangEnum) tmpEnumNode).setValue(maxValue);
+                    }
+                    try {
+                        yangEnumeration.addEnumInfo((YangEnum) tmpEnumNode);
+                    } catch (DataModelException e) {
+                        ParserException parserException = new ParserException(constructExtendedListenerErrorMessage(
+                                DUPLICATE_ENTRY, ENUM_DATA, ctx.string().getText(), EXIT, e.getMessage()));
+                        parserException.setLine(ctx.getStart().getLine());
+                        parserException.setCharPosition(ctx.getStart().getCharPositionInLine());
+                        throw parserException;
+                    }
+                    break;
+                }
+                default:
+                    throw new ParserException(
+                            constructListenerErrorMessage(INVALID_HOLDER, ENUM_DATA, ctx.string().getText(), EXIT));
+            }
+        } else {
+            throw new ParserException(
+                    constructListenerErrorMessage(MISSING_CURRENT_HOLDER, ENUM_DATA, ctx.string().getText(), EXIT));
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/EnumerationListener.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/EnumerationListener.java
new file mode 100644
index 0000000..2db40f3
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/EnumerationListener.java
@@ -0,0 +1,225 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+/*
+ * Reference: RFC6020 and YANG ANTLR Grammar
+ *
+ * ABNF grammar as per RFC6020
+ * type-body-stmts     = numerical-restrictions /
+ *                       decimal64-specification /
+ *                      string-restrictions /
+ *                       enum-specification /
+ *                       leafref-specification /
+ *                       identityref-specification /
+ *                       instance-identifier-specification /
+ *                       bits-specification /
+ *                       union-specification
+ *
+ * enum-specification  = 1*(enum-stmt stmtsep)
+ *
+ * ANTLR grammar rule
+ *
+ * typeBodyStatements : numericalRestrictions | stringRestrictions | enumSpecification
+ *                 | leafrefSpecification | identityrefSpecification | instanceIdentifierSpecification
+ *                 | bitsSpecification | unionSpecification;
+ *
+ * enumSpecification : enumStatement+;
+ */
+
+import org.onosproject.yangutils.datamodel.YangEnumeration;
+import org.onosproject.yangutils.datamodel.YangLeaf;
+import org.onosproject.yangutils.datamodel.YangLeafList;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangType;
+import org.onosproject.yangutils.datamodel.YangTypeDef;
+import org.onosproject.yangutils.datamodel.YangUnion;
+import org.onosproject.yangutils.datamodel.exceptions.DataModelException;
+import org.onosproject.yangutils.datamodel.utils.Parsable;
+import org.onosproject.yangutils.datamodel.utils.YangConstructType;
+import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.TreeWalkListener;
+
+import static org.onosproject.yangutils.datamodel.utils.GeneratedLanguage.JAVA_GENERATION;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.ENUMERATION_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.TYPE_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.ENTRY;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.EXIT;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructExtendedListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_CURRENT_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.UNHANDLED_PARSED_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty;
+import static org.onosproject.yangutils.translator.tojava.YangDataModelFactory.getYangEnumerationNode;
+
+/**
+ * Represents listener based call back function corresponding to the
+ * "enumeration" rule defined in ANTLR grammar file for corresponding ABNF rule
+ * in RFC 6020.
+ */
+public final class EnumerationListener {
+
+    /**
+     * Suffix to be used while creating enumeration class.
+     */
+    private static final String ENUMERATION_CLASS_SUFFIX = "_enum";
+
+    /**
+     * Creates a new enumeration listener.
+     */
+    private EnumerationListener() {
+    }
+
+    /**
+     * It is called when parser enters grammar rule (enumeration), it perform
+     * validations and updates the data model tree.
+     *
+     * @param listener listener's object
+     * @param ctx context object of the grammar rule
+     */
+    public static void processEnumerationEntry(TreeWalkListener listener,
+            GeneratedYangParser.EnumSpecificationContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, ENUMERATION_DATA, "", ENTRY);
+
+        if (listener.getParsedDataStack().peek() instanceof YangType) {
+            YangEnumeration enumerationNode = getYangEnumerationNode(JAVA_GENERATION);
+            Parsable typeData = listener.getParsedDataStack().pop();
+
+            // Check for stack to be non empty.
+            checkStackIsNotEmpty(listener, MISSING_HOLDER, ENUMERATION_DATA, "", ENTRY);
+
+            Parsable tmpData = listener.getParsedDataStack().peek();
+
+            switch (tmpData.getYangConstructType()) {
+                case LEAF_DATA:
+                    // Set the name of enumeration same as leaf.
+                    enumerationNode.setName(((YangLeaf) tmpData).getName() + ENUMERATION_CLASS_SUFFIX);
+                    // Pop the stack entry to obtain the parent YANG node.
+                    Parsable leaf = listener.getParsedDataStack().pop();
+                    // Add the enumeration node to the parent holder of leaf.
+                    addChildToParentNode(listener, enumerationNode);
+                    // Push the popped entry back to the stack.
+                    listener.getParsedDataStack().push(leaf);
+                    break;
+                case LEAF_LIST_DATA:
+                    // Set the name of enumeration same as leaf list.
+                    enumerationNode.setName(((YangLeafList) tmpData).getName() + ENUMERATION_CLASS_SUFFIX);
+                    // Pop the stack entry to obtain the parent YANG node.
+                    Parsable leafList = listener.getParsedDataStack().pop();
+                    // Add the enumeration node to the parent holder of leaf.
+                    addChildToParentNode(listener, enumerationNode);
+                    // Push the popped entry back to the stack.
+                    listener.getParsedDataStack().push(leafList);
+                    break;
+                case UNION_DATA:
+                    YangUnion yangUnion = (YangUnion) tmpData;
+                    /*
+                     * In case parent of enumeration is a union, name of the
+                     * enumeration is parent union name suffixed with running
+                     * integer number, this is done because under union there
+                     * could be multiple child union types.
+                     */
+                    enumerationNode.setName(yangUnion.getName() + ENUMERATION_CLASS_SUFFIX
+                            + yangUnion.getChildUnionNumber());
+                    // Increment the running number.
+                    yangUnion.setChildUnionNumber(yangUnion.getChildUnionNumber() + 1);
+                    // Add union as a child to parent union.
+                    addChildToParentNode(listener, enumerationNode);
+                    break;
+                case TYPEDEF_DATA:
+                    YangTypeDef typeDef = (YangTypeDef) tmpData;
+                    // Set the name of enumeration same as typedef name.
+                    enumerationNode.setName(typeDef.getName() + ENUMERATION_CLASS_SUFFIX);
+                    // Add enumeration as a child to parent type def.
+                    addChildToParentNode(listener, enumerationNode);
+                    break;
+                // TODO deviate.
+                default:
+                    throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, TYPE_DATA,
+                            ((YangType<?>) typeData).getDataTypeName(), ENTRY));
+            }
+            listener.getParsedDataStack().push(typeData);
+            listener.getParsedDataStack().push(enumerationNode);
+        } else {
+            throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, ENUMERATION_DATA, "", ENTRY));
+        }
+    }
+
+    /**
+     * It is called when parser exits from grammar rule (enumeration), it
+     * perform validations and update the data model tree.
+     *
+     * @param listener Listener's object
+     * @param ctx context object of the grammar rule
+     */
+    public static void processEnumerationExit(TreeWalkListener listener,
+            GeneratedYangParser.EnumSpecificationContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, ENUMERATION_DATA, "", EXIT);
+
+        Parsable tmpEnumerationNode = listener.getParsedDataStack().peek();
+        if (tmpEnumerationNode instanceof YangEnumeration) {
+            YangEnumeration enumerationNode = (YangEnumeration) tmpEnumerationNode;
+            listener.getParsedDataStack().pop();
+
+            // Check for stack to be non empty.
+            checkStackIsNotEmpty(listener, MISSING_HOLDER, ENUMERATION_DATA, "", EXIT);
+
+            Parsable tmpNode = listener.getParsedDataStack().peek();
+            switch (tmpNode.getYangConstructType()) {
+                case TYPE_DATA: {
+                    YangType<YangEnumeration> typeNode = (YangType<YangEnumeration>) tmpNode;
+                    typeNode.setDataTypeExtendedInfo(enumerationNode);
+                    break;
+                }
+                default:
+                    throw new ParserException(
+                            constructListenerErrorMessage(INVALID_HOLDER, ENUMERATION_DATA, "", EXIT));
+            }
+        } else {
+            throw new ParserException(
+                    constructListenerErrorMessage(MISSING_CURRENT_HOLDER, ENUMERATION_DATA, "", EXIT));
+        }
+    }
+
+    /**
+     * Adds the enumeration node to the parent holder.
+     *
+     * @param listener listener's object
+     * @param enumerationNode enumeration node which needs to be added to parent
+     */
+    private static void addChildToParentNode(TreeWalkListener listener, YangEnumeration enumerationNode) {
+        if (!(listener.getParsedDataStack().peek() instanceof YangNode)) {
+            throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, ENUMERATION_DATA,
+                    "", ENTRY));
+        } else {
+            YangNode curNode = (YangNode) listener.getParsedDataStack().peek();
+            try {
+                curNode.addChild(enumerationNode);
+            } catch (DataModelException e) {
+                throw new ParserException(constructExtendedListenerErrorMessage(UNHANDLED_PARSED_DATA,
+                        YangConstructType.ENUMERATION_DATA, "", ENTRY, e.getMessage()));
+            }
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/GroupingListener.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/GroupingListener.java
new file mode 100644
index 0000000..5171e2f
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/GroupingListener.java
@@ -0,0 +1,174 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import org.onosproject.yangutils.datamodel.YangContainer;
+import org.onosproject.yangutils.datamodel.YangGrouping;
+import org.onosproject.yangutils.datamodel.YangInput;
+import org.onosproject.yangutils.datamodel.YangList;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangNotification;
+import org.onosproject.yangutils.datamodel.YangOutput;
+import org.onosproject.yangutils.datamodel.YangRpc;
+import org.onosproject.yangutils.datamodel.YangSubModule;
+import org.onosproject.yangutils.datamodel.exceptions.DataModelException;
+import org.onosproject.yangutils.datamodel.utils.Parsable;
+import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.TreeWalkListener;
+
+import static org.onosproject.yangutils.datamodel.utils.GeneratedLanguage.JAVA_GENERATION;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.DESCRIPTION_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.GROUPING_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.REFERENCE_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.STATUS_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.TYPEDEF_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerCollisionDetector.detectCollidingChildUtil;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.ENTRY;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.EXIT;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructExtendedListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_CURRENT_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.UNHANDLED_PARSED_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerUtil.getValidIdentifier;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.validateCardinalityMaxOne;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.validateMutuallyExclusiveChilds;
+import static org.onosproject.yangutils.translator.tojava.YangDataModelFactory.getYangGroupingNode;
+
+/*
+ * Reference: RFC6020 and YANG ANTLR Grammar
+ *
+ * ABNF grammar as per RFC6020
+ * grouping-stmt       = grouping-keyword sep identifier-arg-str optsep
+ *                      (";" /
+ *                       "{" stmtsep
+ *                          ;; these stmts can appear in any order
+ *                          [status-stmt stmtsep]
+ *                           [description-stmt stmtsep]
+ *                           [reference-stmt stmtsep]
+ *                           *((typedef-stmt /
+ *                              grouping-stmt) stmtsep)
+ *                           *(data-def-stmt stmtsep)
+ *                       "}")
+ *
+ * ANTLR grammar rule
+ * groupingStatement : GROUPING_KEYWORD identifier (STMTEND | LEFT_CURLY_BRACE
+ *       (statusStatement | descriptionStatement | referenceStatement | typedefStatement | groupingStatement
+ *       | dataDefStatement)* RIGHT_CURLY_BRACE);
+ */
+
+/**
+ * Represents listener based call back function corresponding to the "grouping"
+ * rule defined in ANTLR grammar file for corresponding ABNF rule in RFC 6020.
+ */
+public final class GroupingListener {
+
+    /**
+     * Creates a new grouping listener.
+     */
+    private GroupingListener() {
+    }
+
+    /**
+     * It is called when parser enters grammar rule (grouping), it perform
+     * validations and updates the data model tree.
+     *
+     * @param listener listener's object
+     * @param ctx context object of the grammar rule
+     */
+    public static void processGroupingEntry(TreeWalkListener listener,
+                                        GeneratedYangParser.GroupingStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, GROUPING_DATA, ctx.identifier().getText(), ENTRY);
+
+        // Check validity of identifier and remove double quotes.
+        String identifier = getValidIdentifier(ctx.identifier().getText(), GROUPING_DATA, ctx);
+
+        // Validate sub statement cardinality.
+        validateSubStatementsCardinality(ctx);
+
+        Parsable curData = listener.getParsedDataStack().peek();
+
+        // Check for identifier collision
+        int line = ctx.getStart().getLine();
+        int charPositionInLine = ctx.getStart().getCharPositionInLine();
+        detectCollidingChildUtil(listener, line, charPositionInLine, identifier, GROUPING_DATA);
+
+        if (curData instanceof YangModule || curData instanceof YangSubModule
+                || curData instanceof YangContainer || curData instanceof YangNotification
+                || curData instanceof YangList || curData instanceof YangGrouping
+                || curData instanceof YangRpc || curData instanceof YangInput
+                || curData instanceof YangOutput) {
+
+            YangGrouping groupingNode = getYangGroupingNode(JAVA_GENERATION);
+            groupingNode.setName(identifier);
+
+            YangNode curNode = (YangNode) curData;
+            try {
+                curNode.addChild(groupingNode);
+            } catch (DataModelException e) {
+                throw new ParserException(constructExtendedListenerErrorMessage(UNHANDLED_PARSED_DATA,
+                        GROUPING_DATA, ctx.identifier().getText(), ENTRY, e.getMessage()));
+            }
+            listener.getParsedDataStack().push(groupingNode);
+        } else {
+            throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER,
+                    GROUPING_DATA, ctx.identifier().getText(), ENTRY));
+        }
+    }
+
+    /**
+     * It is called when parser exits from grammar rule (grouping), it perform
+     * validations and update the data model tree.
+     *
+     * @param listener Listener's object
+     * @param ctx      context object of the grammar rule
+     */
+    public static void processGroupingExit(TreeWalkListener listener,
+                                         GeneratedYangParser.GroupingStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, GROUPING_DATA, ctx.identifier().getText(), EXIT);
+
+        if (listener.getParsedDataStack().peek() instanceof YangGrouping) {
+            listener.getParsedDataStack().pop();
+        } else {
+            throw new ParserException(constructListenerErrorMessage(MISSING_CURRENT_HOLDER, GROUPING_DATA,
+                    ctx.identifier().getText(), EXIT));
+        }
+    }
+
+    /**
+     * Validates the cardinality of case sub-statements as per grammar.
+     *
+     * @param ctx context object of the grammar rule
+     */
+    private static void validateSubStatementsCardinality(GeneratedYangParser.GroupingStatementContext ctx) {
+
+        validateCardinalityMaxOne(ctx.statusStatement(), STATUS_DATA, GROUPING_DATA, ctx.identifier().getText());
+        validateCardinalityMaxOne(ctx.descriptionStatement(), DESCRIPTION_DATA, GROUPING_DATA,
+                ctx.identifier().getText());
+        validateCardinalityMaxOne(ctx.referenceStatement(), REFERENCE_DATA, GROUPING_DATA, ctx.identifier().getText());
+        validateMutuallyExclusiveChilds(ctx.typedefStatement(), TYPEDEF_DATA, ctx.groupingStatement(), GROUPING_DATA,
+                GROUPING_DATA, ctx.identifier().getText());
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/ImportListener.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/ImportListener.java
new file mode 100644
index 0000000..76a2e30
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/ImportListener.java
@@ -0,0 +1,140 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import org.onosproject.yangutils.datamodel.YangImport;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangSubModule;
+import org.onosproject.yangutils.datamodel.utils.Parsable;
+import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.TreeWalkListener;
+
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.IMPORT_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.ENTRY;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.EXIT;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_CURRENT_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerUtil.getValidIdentifier;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty;
+
+/*
+ * Reference: RFC6020 and YANG ANTLR Grammar
+ *
+ * ABNF grammar as per RFC6020
+ * linkage-stmts       = ;; these stmts can appear in any order
+ *                       *(import-stmt stmtsep)
+ *                       *(include-stmt stmtsep)
+ *
+ * import-stmt         = import-keyword sep identifier-arg-str optsep
+ *                       "{" stmtsep
+ *                           prefix-stmt stmtsep
+ *                           [revision-date-stmt stmtsep]
+ *                        "}"
+ *
+ * ANTLR grammar rule
+ * linkage_stmts : (import_stmt
+ *               | include_stmt)*;
+ * import_stmt : IMPORT_KEYWORD identifier LEFT_CURLY_BRACE import_stmt_body
+ *               RIGHT_CURLY_BRACE;
+ * import_stmt_body : prefix_stmt revision_date_stmt?;
+ */
+
+/**
+ * Represents listener based call back function corresponding to the "import"
+ * rule defined in ANTLR grammar file for corresponding ABNF rule in RFC 6020.
+ */
+public final class ImportListener {
+
+    /**
+     * Creates a new import listener.
+     */
+    private ImportListener() {
+    }
+
+    /**
+     * It is called when parser receives an input matching the grammar rule
+     * (import), perform validations and update the data model tree.
+     *
+     * @param listener Listener's object
+     * @param ctx      context object of the grammar rule
+     */
+    public static void processImportEntry(TreeWalkListener listener, GeneratedYangParser.ImportStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, IMPORT_DATA, ctx.identifier().getText(), ENTRY);
+
+        String identifier = getValidIdentifier(ctx.identifier().getText(), IMPORT_DATA, ctx);
+
+        YangImport importNode = new YangImport();
+        importNode.setModuleName(identifier);
+
+        // Set the line number and character position in line for the belongs to.
+        int errorLine = ctx.getStart().getLine();
+        int errorPosition = ctx.getStart().getCharPositionInLine();
+        importNode.setLineNumber(errorLine);
+        importNode.setCharPosition(errorPosition);
+
+        // Push import node to the stack.
+        listener.getParsedDataStack().push(importNode);
+    }
+
+    /**
+     * It is called when parser exits from grammar rule (import), it perform
+     * validations and update the data model tree.
+     *
+     * @param listener Listener's object
+     * @param ctx      context object of the grammar rule
+     */
+    public static void processImportExit(TreeWalkListener listener, GeneratedYangParser.ImportStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, IMPORT_DATA, ctx.identifier().getText(), EXIT);
+
+        Parsable tmpImportNode = listener.getParsedDataStack().peek();
+        if (tmpImportNode instanceof YangImport) {
+            listener.getParsedDataStack().pop();
+
+            // Check for stack to be non empty.
+            checkStackIsNotEmpty(listener, MISSING_HOLDER, IMPORT_DATA, ctx.identifier().getText(),
+                    EXIT);
+
+            Parsable tmpNode = listener.getParsedDataStack().peek();
+            switch (tmpNode.getYangConstructType()) {
+                case MODULE_DATA: {
+                    YangModule module = (YangModule) tmpNode;
+                    module.addToImportList((YangImport) tmpImportNode);
+                    break;
+                }
+                case SUB_MODULE_DATA: {
+                    YangSubModule subModule = (YangSubModule) tmpNode;
+                    subModule.addToImportList((YangImport) tmpImportNode);
+                    break;
+                }
+                default:
+                    throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, IMPORT_DATA,
+                            ctx.identifier().getText(),
+                            EXIT));
+            }
+        } else {
+            throw new ParserException(constructListenerErrorMessage(MISSING_CURRENT_HOLDER, IMPORT_DATA,
+                    ctx.identifier().getText(), EXIT));
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/IncludeListener.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/IncludeListener.java
new file mode 100644
index 0000000..847712f
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/IncludeListener.java
@@ -0,0 +1,139 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import org.onosproject.yangutils.datamodel.YangInclude;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangSubModule;
+import org.onosproject.yangutils.datamodel.utils.Parsable;
+import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.TreeWalkListener;
+
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.INCLUDE_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.ENTRY;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.EXIT;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_CURRENT_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerUtil.getValidIdentifier;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty;
+
+/*
+ * Reference: RFC6020 and YANG ANTLR Grammar
+ *
+ * ABNF grammar as per RFC6020
+ * linkage-stmts       = ;; these stmts can appear in any order
+ *                       *(import-stmt stmtsep)
+ *                       *(include-stmt stmtsep)
+ *
+ * include-stmt        = include-keyword sep identifier-arg-str optsep
+ *                             (";" /
+ *                              "{" stmtsep
+ *                                  [revision-date-stmt stmtsep]
+ *                            "}")
+ *
+ * ANTLR grammar rule
+ * linkage_stmts : (import_stmt
+ *               | include_stmt)*;
+ * include_stmt : INCLUDE_KEYWORD identifier (STMTEND | LEFT_CURLY_BRACE
+ *                revision_date_stmt? RIGHT_CURLY_BRACE);
+ */
+
+/**
+ * Represents listener based call back function corresponding to the "include"
+ * rule defined in ANTLR grammar file for corresponding ABNF rule in RFC 6020.
+ */
+public final class IncludeListener {
+
+    /**
+     * Creates a new include listener.
+     */
+    private IncludeListener() {
+    }
+
+    /**
+     * It is called when parser receives an input matching the grammar rule
+     * (include), perform validations and update the data model tree.
+     *
+     * @param listener Listener's object
+     * @param ctx      context object of the grammar rule
+     */
+    public static void processIncludeEntry(TreeWalkListener listener, GeneratedYangParser.IncludeStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, INCLUDE_DATA, ctx.identifier().getText(),
+                ENTRY);
+
+        String identifier = getValidIdentifier(ctx.identifier().getText(), INCLUDE_DATA, ctx);
+
+        YangInclude includeNode = new YangInclude();
+        includeNode.setSubModuleName(identifier);
+
+        // Set the line number and character position in line for the belongs to.
+        int errorLine = ctx.getStart().getLine();
+        int errorPosition = ctx.getStart().getCharPositionInLine();
+        includeNode.setLineNumber(errorLine);
+        includeNode.setCharPosition(errorPosition);
+
+        listener.getParsedDataStack().push(includeNode);
+    }
+
+    /**
+     * It is called when parser exits from grammar rule (include), it perform
+     * validations and update the data model tree.
+     *
+     * @param listener Listener's object
+     * @param ctx      context object of the grammar rule
+     */
+    public static void processIncludeExit(TreeWalkListener listener, GeneratedYangParser.IncludeStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, INCLUDE_DATA, ctx.identifier().getText(), EXIT);
+
+        Parsable tmpIncludeNode = listener.getParsedDataStack().peek();
+        if (tmpIncludeNode instanceof YangInclude) {
+            listener.getParsedDataStack().pop();
+
+            // Check for stack to be non empty.
+            checkStackIsNotEmpty(listener, MISSING_HOLDER, INCLUDE_DATA, ctx.identifier().getText(),
+                    EXIT);
+
+            Parsable tmpNode = listener.getParsedDataStack().peek();
+            switch (tmpNode.getYangConstructType()) {
+                case MODULE_DATA: {
+                    YangModule module = (YangModule) tmpNode;
+                    module.addToIncludeList((YangInclude) tmpIncludeNode);
+                    break;
+                }
+                case SUB_MODULE_DATA: {
+                    YangSubModule subModule = (YangSubModule) tmpNode;
+                    subModule.addToIncludeList((YangInclude) tmpIncludeNode);
+                    break;
+                }
+                default:
+                    throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, INCLUDE_DATA,
+                            ctx.identifier().getText(),
+                            EXIT));
+            }
+        } else {
+            throw new ParserException(constructListenerErrorMessage(MISSING_CURRENT_HOLDER, INCLUDE_DATA,
+                    ctx.identifier().getText(), EXIT));
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/InputListener.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/InputListener.java
new file mode 100644
index 0000000..92e61f8
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/InputListener.java
@@ -0,0 +1,129 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import org.onosproject.yangutils.datamodel.YangInput;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangRpc;
+import org.onosproject.yangutils.datamodel.exceptions.DataModelException;
+import org.onosproject.yangutils.datamodel.utils.Parsable;
+import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.TreeWalkListener;
+
+import static org.onosproject.yangutils.datamodel.utils.GeneratedLanguage.JAVA_GENERATION;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.INPUT_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.ENTRY;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.EXIT;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction
+        .constructExtendedListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction
+        .constructListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_CURRENT_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.UNHANDLED_PARSED_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty;
+import static org.onosproject.yangutils.translator.tojava.YangDataModelFactory.getYangInputNode;
+
+/*
+ * Reference: RFC6020 and YANG ANTLR Grammar
+ *
+ * ABNF grammar as per RFC6020
+ *
+ * input-stmt          = input-keyword optsep
+ *                       "{" stmtsep
+ *                           ;; these stmts can appear in any order
+ *                           *((typedef-stmt /
+ *                              grouping-stmt) stmtsep)
+ *                           1*(data-def-stmt stmtsep)
+ *                         "}"
+ *
+ * inputStatement : INPUT_KEYWORD LEFT_CURLY_BRACE inputStatementBody RIGHT_CURLY_BRACE;
+
+ * inputStatementBody : typedefStatement* dataDefStatement+
+ *                    | dataDefStatement+ typedefStatement*
+ *                    | groupingStatement* dataDefStatement+
+ *                    | dataDefStatement+ groupingStatement*;
+ */
+
+/**
+ * Represents listener based call back function corresponding to the "input"
+ * rule defined in ANTLR grammar file for corresponding ABNF rule in RFC 6020.
+ */
+public final class InputListener {
+
+    private static final String INPUT_KEYWORD = "_input";
+
+    /**
+     * Creates a new input listener.
+     */
+    private InputListener() {
+    }
+
+    /**
+     * It is called when parser receives an input matching the grammar rule
+     * (input), performs validation and updates the data model tree.
+     *
+     * @param listener listener's object
+     * @param ctx context object of the grammar rule
+     */
+    public static void processInputEntry(TreeWalkListener listener,
+            GeneratedYangParser.InputStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, INPUT_DATA, "", ENTRY);
+
+        Parsable curData = listener.getParsedDataStack().peek();
+        if (curData instanceof YangRpc) {
+
+            YangInput yangInput = getYangInputNode(JAVA_GENERATION);
+            yangInput.setName(((YangRpc) curData).getName() + INPUT_KEYWORD);
+            YangNode curNode = (YangNode) curData;
+            try {
+                curNode.addChild(yangInput);
+            } catch (DataModelException e) {
+                throw new ParserException(constructExtendedListenerErrorMessage(UNHANDLED_PARSED_DATA,
+                        INPUT_DATA, "", ENTRY, e.getMessage()));
+            }
+            listener.getParsedDataStack().push(yangInput);
+        } else {
+            throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, INPUT_DATA,
+                    "", ENTRY));
+        }
+    }
+
+    /**
+     * It is called when parser exits from grammar rule (input), it perform
+     * validations and updates the data model tree.
+     *
+     * @param listener listener's object
+     * @param ctx context object of the grammar rule
+     */
+    public static void processInputExit(TreeWalkListener listener,
+            GeneratedYangParser.InputStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, INPUT_DATA, "", EXIT);
+
+        if (!(listener.getParsedDataStack().peek() instanceof YangInput)) {
+            throw new ParserException(constructListenerErrorMessage(MISSING_CURRENT_HOLDER, INPUT_DATA,
+                    "", EXIT));
+        }
+        listener.getParsedDataStack().pop();
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/KeyListener.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/KeyListener.java
new file mode 100644
index 0000000..889de0a
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/KeyListener.java
@@ -0,0 +1,99 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import org.onosproject.yangutils.datamodel.YangList;
+import org.onosproject.yangutils.datamodel.exceptions.DataModelException;
+import org.onosproject.yangutils.datamodel.utils.Parsable;
+import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.TreeWalkListener;
+
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.KEY_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.ENTRY;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructExtendedListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.UNHANDLED_PARSED_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerUtil.removeQuotesAndHandleConcat;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty;
+
+/*
+ * Reference: RFC6020 and YANG ANTLR Grammar
+ *
+ * ABNF grammar as per RFC6020
+ * key-stmt            = key-keyword sep key-arg-str stmtend
+ *
+ * ANTLR grammar rule
+ * keyStatement : KEY_KEYWORD key STMTEND;
+ * key          : string;
+ */
+
+/**
+ * Represesnts listener based call back function corresponding to the "key" rule
+ * defined in ANTLR grammar file for corresponding ABNF rule in RFC 6020.
+ */
+public final class KeyListener {
+
+    /**
+     * Creates a new key listener.
+     */
+    private KeyListener() {
+    }
+
+    /**
+     * It is called when parser receives an input matching the grammar rule
+     * (key), perform validations and updates the data model tree.
+     *
+     * @param listener listener's object
+     * @param ctx context object of the grammar rule
+     */
+    public static void processKeyEntry(TreeWalkListener listener,
+            GeneratedYangParser.KeyStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, KEY_DATA, ctx.key().getText(), ENTRY);
+
+        Parsable tmpData = listener.getParsedDataStack().peek();
+        if (listener.getParsedDataStack().peek() instanceof YangList) {
+            YangList yangList = (YangList) tmpData;
+            String tmpKeyValue = removeQuotesAndHandleConcat(ctx.key().getText());
+            if (tmpKeyValue.contains(" ")) {
+                String[] keyValues = tmpKeyValue.split(" ");
+                for (String keyValue : keyValues) {
+                    try {
+                        yangList.addKey(keyValue);
+                    } catch (DataModelException e) {
+                        throw new ParserException(constructExtendedListenerErrorMessage(UNHANDLED_PARSED_DATA, KEY_DATA,
+                                ctx.key().getText(), ENTRY, e.getMessage()));
+                    }
+                }
+            } else {
+                try {
+                    yangList.addKey(tmpKeyValue);
+                } catch (DataModelException e) {
+                    throw new ParserException(constructExtendedListenerErrorMessage(UNHANDLED_PARSED_DATA, KEY_DATA,
+                            ctx.key().getText(), ENTRY, e.getMessage()));
+                }
+            }
+        } else {
+            throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, KEY_DATA, ctx.key().getText(),
+                    ENTRY));
+        }
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/LeafListListener.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/LeafListListener.java
new file mode 100644
index 0000000..6d3a97e
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/LeafListListener.java
@@ -0,0 +1,170 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import org.onosproject.yangutils.datamodel.YangLeafList;
+import org.onosproject.yangutils.datamodel.YangLeavesHolder;
+import org.onosproject.yangutils.datamodel.utils.Parsable;
+import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.TreeWalkListener;
+
+import static org.onosproject.yangutils.datamodel.utils.GeneratedLanguage.JAVA_GENERATION;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.CONFIG_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.DESCRIPTION_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.LEAF_LIST_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.MAX_ELEMENT_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.MIN_ELEMENT_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.REFERENCE_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.STATUS_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.TYPE_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.UNITS_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerCollisionDetector.detectCollidingChildUtil;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.ENTRY;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.EXIT;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction
+        .constructListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_CURRENT_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerUtil.getValidIdentifier;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.validateCardinalityEqualsOne;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.validateCardinalityMaxOne;
+import static org.onosproject.yangutils.translator.tojava.YangDataModelFactory.getYangLeafList;
+
+/*
+ * Reference: RFC6020 and YANG ANTLR Grammar
+ *
+ * ABNF grammar as per RFC6020
+ *  leaf-list-stmt      = leaf-list-keyword sep identifier-arg-str optsep
+ *                        "{" stmtsep
+ *                            ;; these stmts can appear in any order
+ *                            [when-stmt stmtsep]
+ *                            *(if-feature-stmt stmtsep)
+ *                            type-stmt stmtsep
+ *                            [units-stmt stmtsep]
+ *                            *(must-stmt stmtsep)
+ *                            [config-stmt stmtsep]
+ *                            [min-elements-stmt stmtsep]
+ *                            [max-elements-stmt stmtsep]
+ *                            [ordered-by-stmt stmtsep]
+ *                            [status-stmt stmtsep]
+ *                            [description-stmt stmtsep]
+ *                            [reference-stmt stmtsep]
+ *                         "}"
+ *
+ * ANTLR grammar rule
+ *  leafListStatement : LEAF_LIST_KEYWORD identifier LEFT_CURLY_BRACE (whenStatement | ifFeatureStatement |
+ *  typeStatement | unitsStatement | mustStatement | configStatement | minElementsStatement | maxElementsStatement |
+ *  orderedByStatement | statusStatement | descriptionStatement | referenceStatement)* RIGHT_CURLY_BRACE;
+ */
+
+/**
+ * Represents listener based call back function corresponding to the "leaf-list"
+ * rule defined in ANTLR grammar file for corresponding ABNF rule in RFC 6020.
+ */
+public final class LeafListListener {
+
+    /**
+     * Creates a new leaf list listener.
+     */
+    private LeafListListener() {
+    }
+
+    /**
+     * It is called when parser receives an input matching the grammar rule
+     * (leaf-list), performs validation and updates the data model tree.
+     *
+     * @param listener listener's object
+     * @param ctx context object of the grammar rule
+     */
+    public static void processLeafListEntry(TreeWalkListener listener,
+            GeneratedYangParser.LeafListStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, LEAF_LIST_DATA, ctx.identifier().getText(), ENTRY);
+
+        String identifier = getValidIdentifier(ctx.identifier().getText(), LEAF_LIST_DATA, ctx);
+
+        // Validate sub statement cardinality.
+        validateSubStatementsCardinality(ctx);
+
+        // Check for identifier collision
+        int line = ctx.getStart().getLine();
+        int charPositionInLine = ctx.getStart().getCharPositionInLine();
+        detectCollidingChildUtil(listener, line, charPositionInLine, identifier, LEAF_LIST_DATA);
+
+        YangLeafList leafList = getYangLeafList(JAVA_GENERATION);
+        leafList.setLeafName(identifier);
+
+        Parsable tmpData = listener.getParsedDataStack().peek();
+        YangLeavesHolder leavesHolder;
+
+        if (tmpData instanceof YangLeavesHolder) {
+            leavesHolder = (YangLeavesHolder) tmpData;
+            leavesHolder.addLeafList(leafList);
+            leafList.setContainedIn(leavesHolder);
+        } else {
+            throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, LEAF_LIST_DATA,
+                    ctx.identifier().getText(), ENTRY));
+        }
+        listener.getParsedDataStack().push(leafList);
+    }
+
+    /**
+     * It is called when parser exits from grammar rule (leaf-list), it performs
+     * validation and updates the data model tree.
+     *
+     * @param listener listener's object
+     * @param ctx context object of the grammar rule
+     */
+    public static void processLeafListExit(TreeWalkListener listener,
+            GeneratedYangParser.LeafListStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, LEAF_LIST_DATA, ctx.identifier().getText(), EXIT);
+
+        if (listener.getParsedDataStack().peek() instanceof YangLeafList) {
+            listener.getParsedDataStack().pop();
+        } else {
+            throw new ParserException(constructListenerErrorMessage(MISSING_CURRENT_HOLDER, LEAF_LIST_DATA,
+                    ctx.identifier().getText(), EXIT));
+        }
+    }
+
+    /**
+     * Validates the cardinality of leaf-list sub-statements as per grammar.
+     *
+     * @param ctx context object of the grammar rule
+     */
+    private static void validateSubStatementsCardinality(GeneratedYangParser.LeafListStatementContext ctx) {
+
+        validateCardinalityEqualsOne(ctx.typeStatement(), TYPE_DATA, LEAF_LIST_DATA, ctx.identifier().getText(), ctx);
+        validateCardinalityMaxOne(ctx.unitsStatement(), UNITS_DATA, LEAF_LIST_DATA, ctx.identifier().getText());
+        validateCardinalityMaxOne(ctx.configStatement(), CONFIG_DATA, LEAF_LIST_DATA, ctx.identifier().getText());
+        validateCardinalityMaxOne(ctx.maxElementsStatement(), MAX_ELEMENT_DATA, LEAF_LIST_DATA,
+                ctx.identifier().getText());
+        validateCardinalityMaxOne(ctx.minElementsStatement(), MIN_ELEMENT_DATA, LEAF_LIST_DATA,
+                ctx.identifier().getText());
+        validateCardinalityMaxOne(ctx.descriptionStatement(), DESCRIPTION_DATA, LEAF_LIST_DATA,
+                ctx.identifier().getText());
+        validateCardinalityMaxOne(ctx.referenceStatement(), REFERENCE_DATA, LEAF_LIST_DATA, ctx.identifier().getText());
+        validateCardinalityMaxOne(ctx.statusStatement(), STATUS_DATA, LEAF_LIST_DATA, ctx.identifier().getText());
+        //TODO ordered by
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/LeafListener.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/LeafListener.java
new file mode 100644
index 0000000..7b5ac34
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/LeafListener.java
@@ -0,0 +1,169 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Implements listener based call back function corresponding to the "leaf"
+ * rule defined in ANTLR grammar file for corresponding ABNF rule in RFC 6020.
+ */
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import org.onosproject.yangutils.datamodel.YangLeaf;
+import org.onosproject.yangutils.datamodel.YangLeavesHolder;
+import org.onosproject.yangutils.datamodel.utils.Parsable;
+import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.TreeWalkListener;
+
+import static org.onosproject.yangutils.datamodel.utils.GeneratedLanguage.JAVA_GENERATION;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.CONFIG_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.DESCRIPTION_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.LEAF_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.MANDATORY_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.REFERENCE_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.STATUS_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.TYPE_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.UNITS_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerCollisionDetector.detectCollidingChildUtil;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.ENTRY;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.EXIT;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction
+        .constructListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_CURRENT_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerUtil.getValidIdentifier;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.validateCardinalityEqualsOne;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.validateCardinalityMaxOne;
+import static org.onosproject.yangutils.translator.tojava.YangDataModelFactory.getYangLeaf;
+
+/*
+ * Reference: RFC6020 and YANG ANTLR Grammar
+ *
+ * ABNF grammar as per RFC6020
+ *  leaf-stmt           = leaf-keyword sep identifier-arg-str optsep
+ *                        "{" stmtsep
+ *                            ;; these stmts can appear in any order
+ *                            [when-stmt stmtsep]
+ *                            *(if-feature-stmt stmtsep)
+ *                            type-stmt stmtsep
+ *                            [units-stmt stmtsep]
+ *                            *(must-stmt stmtsep)
+ *                            [default-stmt stmtsep]
+ *                            [config-stmt stmtsep]
+ *                            [mandatory-stmt stmtsep]
+ *                            [status-stmt stmtsep]
+ *                            [description-stmt stmtsep]
+ *                            [reference-stmt stmtsep]
+ *                         "}"
+ *
+ * ANTLR grammar rule
+ *  leafStatement : LEAF_KEYWORD identifier LEFT_CURLY_BRACE (whenStatement | ifFeatureStatement | typeStatement |
+ *  unitsStatement | mustStatement | defaultStatement | configStatement | mandatoryStatement | statusStatement  |
+ *  descriptionStatement | referenceStatement)* RIGHT_CURLY_BRACE;
+ */
+
+/**
+ * Represents listener based call back function corresponding to the "leaf" rule
+ * defined in ANTLR grammar file for corresponding ABNF rule in RFC 6020.
+ */
+public final class LeafListener {
+
+    /**
+     * Creates a new leaf listener.
+     */
+    private LeafListener() {
+    }
+
+    /**
+     * It is called when parser receives an input matching the grammar rule
+     * (leaf), performs validation and updates the data model tree.
+     *
+     * @param listener listener's object
+     * @param ctx context object of the grammar rule
+     */
+    public static void processLeafEntry(TreeWalkListener listener,
+            GeneratedYangParser.LeafStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, LEAF_DATA, ctx.identifier().getText(), ENTRY);
+
+        String identifier = getValidIdentifier(ctx.identifier().getText(), LEAF_DATA, ctx);
+
+        // Validate sub statement cardinality.
+        validateSubStatementsCardinality(ctx);
+
+        // Check for identifier collision
+        int line = ctx.getStart().getLine();
+        int charPositionInLine = ctx.getStart().getCharPositionInLine();
+        detectCollidingChildUtil(listener, line, charPositionInLine, identifier, LEAF_DATA);
+
+        YangLeaf leaf = getYangLeaf(JAVA_GENERATION);
+        leaf.setLeafName(identifier);
+
+        Parsable tmpData = listener.getParsedDataStack().peek();
+        YangLeavesHolder leavesHolder;
+
+        if (tmpData instanceof YangLeavesHolder) {
+            leavesHolder = (YangLeavesHolder) tmpData;
+            leavesHolder.addLeaf(leaf);
+            leaf.setContainedIn(leavesHolder);
+        } else {
+            throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, LEAF_DATA,
+                    ctx.identifier().getText(), ENTRY));
+        }
+
+        listener.getParsedDataStack().push(leaf);
+    }
+
+    /**
+     * It is called when parser exits from grammar rule (leaf), performs
+     * validation and updates the data model tree.
+     *
+     * @param listener listener's object
+     * @param ctx context object of the grammar rule
+     */
+    public static void processLeafExit(TreeWalkListener listener,
+            GeneratedYangParser.LeafStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, LEAF_DATA, ctx.identifier().getText(), EXIT);
+
+        if (listener.getParsedDataStack().peek() instanceof YangLeaf) {
+            listener.getParsedDataStack().pop();
+        } else {
+            throw new ParserException(constructListenerErrorMessage(MISSING_CURRENT_HOLDER, LEAF_DATA,
+                    ctx.identifier().getText(), EXIT));
+        }
+    }
+
+    /**
+     * Validates the cardinality of leaf sub-statements as per grammar.
+     *
+     * @param ctx context object of the grammar rule
+     */
+    private static void validateSubStatementsCardinality(GeneratedYangParser.LeafStatementContext ctx) {
+
+        validateCardinalityEqualsOne(ctx.typeStatement(), TYPE_DATA, LEAF_DATA, ctx.identifier().getText(), ctx);
+        validateCardinalityMaxOne(ctx.unitsStatement(), UNITS_DATA, LEAF_DATA, ctx.identifier().getText());
+        validateCardinalityMaxOne(ctx.configStatement(), CONFIG_DATA, LEAF_DATA, ctx.identifier().getText());
+        validateCardinalityMaxOne(ctx.mandatoryStatement(), MANDATORY_DATA, LEAF_DATA, ctx.identifier().getText());
+        validateCardinalityMaxOne(ctx.descriptionStatement(), DESCRIPTION_DATA, LEAF_DATA, ctx.identifier().getText());
+        validateCardinalityMaxOne(ctx.referenceStatement(), REFERENCE_DATA, LEAF_DATA, ctx.identifier().getText());
+        validateCardinalityMaxOne(ctx.statusStatement(), STATUS_DATA, LEAF_DATA, ctx.identifier().getText());
+        //TODO when.
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/LengthRestrictionListener.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/LengthRestrictionListener.java
new file mode 100644
index 0000000..bf8c6b0
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/LengthRestrictionListener.java
@@ -0,0 +1,179 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import org.onosproject.yangutils.datamodel.YangDerivedInfo;
+import org.onosproject.yangutils.datamodel.YangRangeRestriction;
+import org.onosproject.yangutils.datamodel.YangStringRestriction;
+import org.onosproject.yangutils.datamodel.YangType;
+import org.onosproject.yangutils.datamodel.exceptions.DataModelException;
+import org.onosproject.yangutils.datamodel.utils.Parsable;
+import org.onosproject.yangutils.datamodel.utils.YangConstructType;
+import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.TreeWalkListener;
+
+import static org.onosproject.yangutils.datamodel.YangDataTypes.BINARY;
+import static org.onosproject.yangutils.datamodel.YangDataTypes.DERIVED;
+import static org.onosproject.yangutils.datamodel.YangDataTypes.STRING;
+import static org.onosproject.yangutils.datamodel.utils.RestrictionResolver.processLengthRestriction;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.LENGTH_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.TYPE_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.ENTRY;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.EXIT;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_CURRENT_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty;
+
+/*
+ * Reference: RFC6020 and YANG ANTLR Grammar
+ *
+ * ABNF grammar as per RFC6020
+ *  length-stmt         = length-keyword sep length-arg-str optsep
+ *                        (";" /
+ *                         "{" stmtsep
+ *                             ;; these stmts can appear in any order
+ *                             [error-message-stmt stmtsep]
+ *                             [error-app-tag-stmt stmtsep]
+ *                             [description-stmt stmtsep]
+ *                             [reference-stmt stmtsep]
+ *                          "}")
+ *
+ *
+ * ANTLR grammar rule
+ * lengthStatement : LENGTH_KEYWORD length
+ *                 (STMTEND | LEFT_CURLY_BRACE commonStatements RIGHT_CURLY_BRACE);
+ */
+
+/**
+ * Represents listener based call back function corresponding to the "length"
+ * rule defined in ANTLR grammar file for corresponding ABNF rule in RFC 6020.
+ */
+public final class LengthRestrictionListener {
+
+    /**
+     * Creates a new length restriction listener.
+     */
+    private LengthRestrictionListener() {
+    }
+
+    /**
+     * It is called when parser receives an input matching the grammar
+     * rule (length), performs validation and updates the data model
+     * tree.
+     *
+     * @param listener listener's object
+     * @param ctx      context object of the grammar rule
+     */
+    public static void processLengthRestrictionEntry(TreeWalkListener listener,
+                                                     GeneratedYangParser.LengthStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, LENGTH_DATA, ctx.length().getText(), ENTRY);
+
+        Parsable tmpData = listener.getParsedDataStack().peek();
+        if (tmpData.getYangConstructType() == TYPE_DATA) {
+            YangType type = (YangType) tmpData;
+            setLengthRestriction(listener, type, ctx);
+        } else {
+            throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, LENGTH_DATA,
+                    ctx.length().getText(), ENTRY));
+        }
+    }
+
+    /**
+     * Sets the length restriction to type.
+     *
+     * @param listener listener's object
+     * @param type     Yang type for which length restriction to be set
+     * @param ctx      context object of the grammar rule
+     */
+    private static void setLengthRestriction(TreeWalkListener listener, YangType type,
+                                             GeneratedYangParser.LengthStatementContext ctx) {
+
+        if (type.getDataType() == DERIVED) {
+            ((YangDerivedInfo<YangRangeRestriction>) type.getDataTypeExtendedInfo())
+                    .setLengthRestrictionString(ctx.length().getText());
+            ((YangDerivedInfo<YangRangeRestriction>) type.getDataTypeExtendedInfo())
+                    .setLineNumber(ctx.getStart().getLine());
+            ((YangDerivedInfo<YangRangeRestriction>) type.getDataTypeExtendedInfo())
+                    .setCharPosition(ctx.getStart().getCharPositionInLine());
+            return;
+        }
+
+        if (type.getDataType() != STRING && type.getDataType() != BINARY) {
+            ParserException parserException = new ParserException("YANG file error : " +
+                    YangConstructType.getYangConstructType(LENGTH_DATA) + " name " + ctx.length().getText() +
+                    " can be used to restrict the built-in type string/binary or types derived from string/binary.");
+            parserException.setLine(ctx.getStart().getLine());
+            parserException.setCharPosition(ctx.getStart().getCharPositionInLine());
+            throw parserException;
+        }
+
+        YangRangeRestriction lengthRestriction = null;
+        try {
+            lengthRestriction = processLengthRestriction(null, ctx.getStart().getLine(),
+                    ctx.getStart().getCharPositionInLine(), false, ctx.length().getText());
+        } catch (DataModelException e) {
+            ParserException parserException = new ParserException(e.getMessage());
+            parserException.setCharPosition(e.getCharPositionInLine());
+            parserException.setLine(e.getLineNumber());
+            throw parserException;
+        }
+
+        if (type.getDataType() == STRING) {
+            YangStringRestriction stringRestriction = (YangStringRestriction) type.getDataTypeExtendedInfo();
+            if (stringRestriction == null) {
+                stringRestriction = new YangStringRestriction();
+                type.setDataTypeExtendedInfo(stringRestriction);
+            }
+
+            stringRestriction.setLengthRestriction(lengthRestriction);
+        } else {
+            type.setDataTypeExtendedInfo(lengthRestriction);
+        }
+
+        listener.getParsedDataStack().push(lengthRestriction);
+    }
+
+    /**
+     * Performs validation and updates the data model tree.
+     * It is called when parser exits from grammar rule (length).
+     *
+     * @param listener listener's object
+     * @param ctx      context object of the grammar rule
+     */
+    public static void processLengthRestrictionExit(TreeWalkListener listener,
+                                                    GeneratedYangParser.LengthStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, LENGTH_DATA, ctx.length().getText(), EXIT);
+
+        Parsable tmpData = listener.getParsedDataStack().peek();
+        if (tmpData instanceof YangRangeRestriction) {
+            listener.getParsedDataStack().pop();
+        } else if (tmpData instanceof YangType
+                && ((YangType) tmpData).getDataType() == DERIVED) {
+            // TODO : need to handle in linker
+        } else {
+            throw new ParserException(constructListenerErrorMessage(MISSING_CURRENT_HOLDER, LENGTH_DATA,
+                    ctx.length().getText(), EXIT));
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/ListListener.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/ListListener.java
new file mode 100644
index 0000000..d0e7300
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/ListListener.java
@@ -0,0 +1,205 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import org.onosproject.yangutils.datamodel.YangAugment;
+import org.onosproject.yangutils.datamodel.YangCase;
+import org.onosproject.yangutils.datamodel.YangContainer;
+import org.onosproject.yangutils.datamodel.YangGrouping;
+import org.onosproject.yangutils.datamodel.YangInput;
+import org.onosproject.yangutils.datamodel.YangList;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangNotification;
+import org.onosproject.yangutils.datamodel.YangOutput;
+import org.onosproject.yangutils.datamodel.YangSubModule;
+import org.onosproject.yangutils.datamodel.exceptions.DataModelException;
+import org.onosproject.yangutils.datamodel.utils.Parsable;
+import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.TreeWalkListener;
+import org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation;
+
+import static org.onosproject.yangutils.datamodel.utils.GeneratedLanguage.JAVA_GENERATION;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.CONFIG_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.DATA_DEF_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.DESCRIPTION_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.KEY_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.LIST_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.MAX_ELEMENT_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.MIN_ELEMENT_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.REFERENCE_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.STATUS_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerCollisionDetector.detectCollidingChildUtil;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.ENTRY;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.EXIT;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructExtendedListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_CURRENT_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.UNHANDLED_PARSED_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerUtil.getValidIdentifier;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.validateCardinalityMaxOne;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.validateCardinalityNonZero;
+import static org.onosproject.yangutils.translator.tojava.YangDataModelFactory.getYangListNode;
+
+/*
+ * Reference: RFC6020 and YANG ANTLR Grammar
+ *
+ * ABNF grammar as per RFC6020
+ *  list-stmt           = list-keyword sep identifier-arg-str optsep
+ *                        "{" stmtsep
+ *                            ;; these stmts can appear in any order
+ *                            [when-stmt stmtsep]
+ *                            *(if-feature-stmt stmtsep)
+ *                            *(must-stmt stmtsep)
+ *                            [key-stmt stmtsep]
+ *                            *(unique-stmt stmtsep)
+ *                            [config-stmt stmtsep]
+ *                            [min-elements-stmt stmtsep]
+ *                            [max-elements-stmt stmtsep]
+ *                            [ordered-by-stmt stmtsep]
+ *                            [status-stmt stmtsep]
+ *                            [description-stmt stmtsep]
+ *                            [reference-stmt stmtsep]
+ *                            *((typedef-stmt /
+ *                               grouping-stmt) stmtsep)
+ *                            1*(data-def-stmt stmtsep)
+ *                         "}"
+ *
+ * ANTLR grammar rule
+ *  listStatement : LIST_KEYWORD identifier LEFT_CURLY_BRACE (whenStatement | ifFeatureStatement | mustStatement |
+ *  keyStatement | uniqueStatement | configStatement | minElementsStatement | maxElementsStatement |
+ *  orderedByStatement | statusStatement | descriptionStatement | referenceStatement | typedefStatement |
+ *  groupingStatement| dataDefStatement)* RIGHT_CURLY_BRACE;
+ */
+
+/**
+ * Represents listener based call back function corresponding to the "list" rule
+ * defined in ANTLR grammar file for corresponding ABNF rule in RFC 6020.
+ */
+public final class ListListener {
+
+    /**
+     * Creates a new list listener.
+     */
+    private ListListener() {
+    }
+
+    /**
+     * It is called when parser receives an input matching the grammar rule
+     * (list), performs validation and updates the data model tree.
+     *
+     * @param listener listener's object
+     * @param ctx context object of the grammar rule
+     */
+    public static void processListEntry(TreeWalkListener listener,
+            GeneratedYangParser.ListStatementContext ctx) {
+
+        YangNode curNode;
+
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, LIST_DATA, ctx.identifier().getText(), ENTRY);
+
+        String identifier = getValidIdentifier(ctx.identifier().getText(), LIST_DATA, ctx);
+
+        // Validate sub statement cardinality.
+        validateSubStatementsCardinality(ctx);
+
+        // Check for identifier collision
+        int line = ctx.getStart().getLine();
+        int charPositionInLine = ctx.getStart().getCharPositionInLine();
+        detectCollidingChildUtil(listener, line, charPositionInLine, identifier, LIST_DATA);
+
+        YangList yangList = getYangListNode(JAVA_GENERATION);
+        yangList.setName(identifier);
+
+        /*
+         * If "config" is not specified, the default is the same as the parent
+         * schema node's "config" value.
+         */
+        if (ctx.configStatement().isEmpty()) {
+            boolean parentConfig = ListenerValidation.getParentNodeConfig(listener);
+            yangList.setConfig(parentConfig);
+        }
+
+        Parsable curData = listener.getParsedDataStack().peek();
+        if (curData instanceof YangModule || curData instanceof YangContainer
+                || curData instanceof YangList || curData instanceof YangCase
+                || curData instanceof YangNotification || curData instanceof YangInput
+                || curData instanceof YangOutput || curData instanceof YangAugment
+                || curData instanceof YangGrouping || curData instanceof YangSubModule) {
+            curNode = (YangNode) curData;
+            try {
+                curNode.addChild(yangList);
+            } catch (DataModelException e) {
+                throw new ParserException(constructExtendedListenerErrorMessage(UNHANDLED_PARSED_DATA,
+                        LIST_DATA, ctx.identifier().getText(), ENTRY, e.getMessage()));
+            }
+            listener.getParsedDataStack().push(yangList);
+        } else {
+            throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, LIST_DATA,
+                    ctx.identifier().getText(), ENTRY));
+        }
+    }
+
+    /**
+     * It is called when parser exits from grammar rule (list), it performs
+     * validation and updates the data model tree.
+     *
+     * @param listener listener's object
+     * @param ctx context object of the grammar rule
+     */
+    public static void processListExit(TreeWalkListener listener,
+            GeneratedYangParser.ListStatementContext ctx) {
+
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, LIST_DATA, ctx.identifier().getText(), EXIT);
+
+        if (listener.getParsedDataStack().peek() instanceof YangList) {
+            YangList yangList = (YangList) listener.getParsedDataStack().peek();
+            try {
+                yangList.validateDataOnExit();
+            } catch (DataModelException e) {
+                throw new ParserException(constructExtendedListenerErrorMessage(UNHANDLED_PARSED_DATA,
+                        LIST_DATA, ctx.identifier().getText(), EXIT, e.getMessage()));
+            }
+            listener.getParsedDataStack().pop();
+        } else {
+            throw new ParserException(constructListenerErrorMessage(MISSING_CURRENT_HOLDER, LIST_DATA,
+                    ctx.identifier().getText(), EXIT));
+        }
+    }
+
+    /**
+     * Validates the cardinality of list sub-statements as per grammar.
+     *
+     * @param ctx context object of the grammar rule
+     */
+    private static void validateSubStatementsCardinality(GeneratedYangParser.ListStatementContext ctx) {
+
+        validateCardinalityMaxOne(ctx.keyStatement(), KEY_DATA, LIST_DATA, ctx.identifier().getText());
+        validateCardinalityMaxOne(ctx.configStatement(), CONFIG_DATA, LIST_DATA, ctx.identifier().getText());
+        validateCardinalityMaxOne(ctx.maxElementsStatement(), MAX_ELEMENT_DATA, LIST_DATA, ctx.identifier().getText());
+        validateCardinalityMaxOne(ctx.minElementsStatement(), MIN_ELEMENT_DATA, LIST_DATA, ctx.identifier().getText());
+        validateCardinalityMaxOne(ctx.descriptionStatement(), DESCRIPTION_DATA, LIST_DATA, ctx.identifier().getText());
+        validateCardinalityMaxOne(ctx.referenceStatement(), REFERENCE_DATA, LIST_DATA, ctx.identifier().getText());
+        validateCardinalityMaxOne(ctx.statusStatement(), STATUS_DATA, LIST_DATA, ctx.identifier().getText());
+        validateCardinalityNonZero(ctx.dataDefStatement(), DATA_DEF_DATA, LIST_DATA, ctx.identifier().getText(), ctx);
+        //TODO when, typedef, grouping, unique
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/MandatoryListener.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/MandatoryListener.java
new file mode 100644
index 0000000..b945f81
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/MandatoryListener.java
@@ -0,0 +1,90 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import org.onosproject.yangutils.datamodel.YangLeaf;
+import org.onosproject.yangutils.datamodel.utils.Parsable;
+import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.TreeWalkListener;
+
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.MANDATORY_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.ENTRY;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerUtil.getValidBooleanValue;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty;
+
+/*
+ * Reference: RFC6020 and YANG ANTLR Grammar
+ *
+ * ABNF grammar as per RFC6020
+ *  mandatory-stmt      = mandatory-keyword sep
+ *                        mandatory-arg-str stmtend
+ *
+ *  mandatory-arg-str   = < a string that matches the rule
+ *                          mandatory-arg >
+ *
+ *  mandatory-arg       = true-keyword / false-keyword
+ *
+ * ANTLR grammar rule
+ *  mandatoryStatement : MANDATORY_KEYWORD mandatory STMTEND;
+ *  mandatory          : string;
+ */
+
+/**
+ * Represents listener based call back function corresponding to the "mandatory"
+ * rule defined in ANTLR grammar file for corresponding ABNF rule in RFC 6020.
+ */
+public final class MandatoryListener {
+
+    /**
+     * Creates a new mandatory listener.
+     */
+    private MandatoryListener() {
+    }
+
+    /**
+     * It is called when parser receives an input matching the grammar
+     * rule (mandatory), performs validation and updates the data model
+     * tree.
+     *
+     * @param listener listener's object
+     * @param ctx context object of the grammar rule
+     */
+    public static void processMandatoryEntry(TreeWalkListener listener,
+                                          GeneratedYangParser.MandatoryStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, MANDATORY_DATA, "", ENTRY);
+
+        boolean isMandatory = getValidBooleanValue(ctx.mandatory().getText(), MANDATORY_DATA, ctx);
+
+        Parsable tmpNode = listener.getParsedDataStack().peek();
+        switch (tmpNode.getYangConstructType()) {
+            case LEAF_DATA:
+                YangLeaf leaf = (YangLeaf) tmpNode;
+                leaf.setMandatory(isMandatory);
+                break;
+            case CHOICE_DATA: // TODO
+                break;
+            default:
+                throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, MANDATORY_DATA, "", ENTRY));
+        }
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/MaxElementsListener.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/MaxElementsListener.java
new file mode 100644
index 0000000..afb6dc3
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/MaxElementsListener.java
@@ -0,0 +1,130 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import org.onosproject.yangutils.datamodel.YangLeafList;
+import org.onosproject.yangutils.datamodel.YangList;
+import org.onosproject.yangutils.datamodel.utils.Parsable;
+import org.onosproject.yangutils.datamodel.utils.YangConstructType;
+import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.TreeWalkListener;
+
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.MAX_ELEMENT_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.ENTRY;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerUtil.removeQuotesAndHandleConcat;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty;
+
+/*
+ * Reference: RFC6020 and YANG ANTLR Grammar
+ *
+ * ABNF grammar as per RFC6020
+ *  max-elements-stmt   = max-elements-keyword sep
+ *                        max-value-arg-str stmtend
+ *  max-value-arg-str   = < a string that matches the rule
+ *                          max-value-arg >
+ *
+ * ANTLR grammar rule
+ * maxElementsStatement : MAX_ELEMENTS_KEYWORD maxValue STMTEND;
+ * maxValue             : string;
+ */
+
+/**
+ * Represents listener based call back function corresponding to the
+ * "max-elements" rule defined in ANTLR grammar file for corresponding ABNF rule
+ * in RFC 6020.
+ */
+public final class MaxElementsListener {
+
+    private static final String POSITIVE_INTEGER_PATTERN = "[1-9][0-9]*";
+    private static final String UNBOUNDED_KEYWORD = "unbounded";
+
+    /**
+     * Creates a new max-elements listener.
+     */
+    private MaxElementsListener() {
+    }
+
+    /**
+     * It is called when parser receives an input matching the grammar rule
+     * (max-elements), performs validation and updates the data model tree.
+     *
+     * @param listener listener's object
+     * @param ctx context object of the grammar rule
+     */
+    public static void processMaxElementsEntry(TreeWalkListener listener,
+            GeneratedYangParser.MaxElementsStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, MAX_ELEMENT_DATA, "", ENTRY);
+
+        int maxElementsValue = getValidMaxElementValue(ctx);
+
+        Parsable tmpData = listener.getParsedDataStack().peek();
+        switch (tmpData.getYangConstructType()) {
+            case LEAF_LIST_DATA:
+                YangLeafList leafList = (YangLeafList) tmpData;
+                leafList.setMaxElelements(maxElementsValue);
+                break;
+            case LIST_DATA:
+                YangList yangList = (YangList) tmpData;
+                yangList.setMaxElements(maxElementsValue);
+                break;
+            default:
+                throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, MAX_ELEMENT_DATA, "", ENTRY));
+        }
+    }
+
+    /**
+     * Validates max element value and returns the value from context.
+     *
+     * @param ctx context object of the grammar rule
+     * @return max element's value
+     */
+    private static int getValidMaxElementValue(GeneratedYangParser.MaxElementsStatementContext ctx) {
+
+        int maxElementsValue;
+
+        String value = removeQuotesAndHandleConcat(ctx.maxValue().getText());
+        if (value.equals(UNBOUNDED_KEYWORD)) {
+            maxElementsValue = Integer.MAX_VALUE;
+        } else if (value.matches(POSITIVE_INTEGER_PATTERN)) {
+            try {
+                maxElementsValue = Integer.parseInt(value);
+            } catch (NumberFormatException e) {
+                ParserException parserException = new ParserException("YANG file error : " +
+                        YangConstructType.getYangConstructType(MAX_ELEMENT_DATA) + " value " + value + " is not " +
+                        "valid.");
+                parserException.setLine(ctx.getStart().getLine());
+                parserException.setCharPosition(ctx.getStart().getCharPositionInLine());
+                throw parserException;
+            }
+        } else {
+            ParserException parserException = new ParserException("YANG file error : " +
+                    YangConstructType.getYangConstructType(MAX_ELEMENT_DATA) + " value " + value + " is not " +
+                    "valid.");
+            parserException.setLine(ctx.getStart().getLine());
+            parserException.setCharPosition(ctx.getStart().getCharPositionInLine());
+            throw parserException;
+        }
+
+        return maxElementsValue;
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/MinElementsListener.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/MinElementsListener.java
new file mode 100644
index 0000000..7553aa2
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/MinElementsListener.java
@@ -0,0 +1,92 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import org.onosproject.yangutils.datamodel.YangLeafList;
+import org.onosproject.yangutils.datamodel.YangList;
+import org.onosproject.yangutils.datamodel.utils.Parsable;
+import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.TreeWalkListener;
+
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.MIN_ELEMENT_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.ENTRY;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerUtil.getValidNonNegativeIntegerValue;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty;
+
+/*
+ * Reference: RFC6020 and YANG ANTLR Grammar
+ *
+ * ABNF grammar as per RFC6020
+ *  min-elements-stmt   = min-elements-keyword sep
+ *                        min-value-arg-str stmtend
+ *  min-value-arg-str   = < a string that matches the rule
+ *                          min-value-arg >
+ *  min-value-arg       = non-negative-integer-value
+ *
+ * ANTLR grammar rule
+ * minElementsStatement : MIN_ELEMENTS_KEYWORD minValue STMTEND;
+ * minValue             : string;
+ */
+
+/**
+ * Represents listener based call back function corresponding to the "min-elements"
+ * rule defined in ANTLR grammar file for corresponding ABNF rule in RFC 6020.
+ */
+public final class MinElementsListener {
+
+    /**
+     * Creates a new min-elements listener.
+     */
+    private MinElementsListener() {
+    }
+
+    /**
+     * It is called when parser receives an input matching the grammar
+     * rule (min-elements), performs validation and updates the data model
+     * tree.
+     *
+     * @param listener listener's object
+     * @param ctx context object of the grammar rule
+     */
+    public static void processMinElementsEntry(TreeWalkListener listener,
+                                               GeneratedYangParser.MinElementsStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, MIN_ELEMENT_DATA, ctx.minValue().getText(), ENTRY);
+
+        int minElementValue = getValidNonNegativeIntegerValue(ctx.minValue().getText(), MIN_ELEMENT_DATA, ctx);
+
+        Parsable tmpData = listener.getParsedDataStack().peek();
+        switch (tmpData.getYangConstructType()) {
+            case LEAF_LIST_DATA:
+                YangLeafList leafList = (YangLeafList) tmpData;
+                leafList.setMinElements(minElementValue);
+                break;
+            case LIST_DATA:
+                YangList yangList = (YangList) tmpData;
+                yangList.setMinElements(minElementValue);
+                break;
+            default:
+                throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, MIN_ELEMENT_DATA,
+                        ctx.minValue().getText(), ENTRY));
+        }
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/ModuleListener.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/ModuleListener.java
new file mode 100644
index 0000000..ef1af2d
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/ModuleListener.java
@@ -0,0 +1,132 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import org.onosproject.yangutils.datamodel.ResolvableType;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangReferenceResolver;
+import org.onosproject.yangutils.datamodel.YangRevision;
+import org.onosproject.yangutils.datamodel.exceptions.DataModelException;
+import org.onosproject.yangutils.linker.exceptions.LinkerException;
+import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.TreeWalkListener;
+
+import static org.onosproject.yangutils.datamodel.utils.GeneratedLanguage.JAVA_GENERATION;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.MODULE_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.ENTRY;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.EXIT;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_CURRENT_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerUtil.getValidIdentifier;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerUtil.setCurrentDateForRevision;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsEmpty;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty;
+import static org.onosproject.yangutils.translator.tojava.YangDataModelFactory.getYangModuleNode;
+
+/*
+ * Reference: RFC6020 and YANG ANTLR Grammar
+ *
+ * ABNF grammar as per RFC6020
+ * module-stmt         = optsep module-keyword sep identifier-arg-str
+ *                       optsep
+ *                       "{" stmtsep
+ *                           module-header-stmts
+ *                           linkage-stmts
+ *                           meta-stmts
+ *                           revision-stmts
+ *                           body-stmts
+ *                       "}" optsep
+ *
+ * ANTLR grammar rule
+ * module_stmt : MODULE_KEYWORD identifier LEFT_CURLY_BRACE module_body* RIGHT_CURLY_BRACE;
+ */
+
+/**
+ * Represents listener based call back function corresponding to the "module"
+ * rule defined in ANTLR grammar file for corresponding ABNF rule in RFC 6020.
+ */
+public final class ModuleListener {
+
+    /**
+     * Creates a new module listener.
+     */
+    private ModuleListener() {
+    }
+
+    /**
+     * It is called when parser receives an input matching the grammar rule
+     * (module), perform validations and update the data model tree.
+     *
+     * @param listener Listener's object
+     * @param ctx      context object of the grammar rule
+     */
+    public static void processModuleEntry(TreeWalkListener listener, GeneratedYangParser.ModuleStatementContext ctx) {
+
+        // Check if stack is empty.
+        checkStackIsEmpty(listener, INVALID_HOLDER, MODULE_DATA, ctx.identifier().getText(), ENTRY);
+
+        String identifier = getValidIdentifier(ctx.identifier().getText(), MODULE_DATA, ctx);
+
+        YangModule yangModule = getYangModuleNode(JAVA_GENERATION);
+        yangModule.setName(identifier);
+
+        if (ctx.moduleBody().moduleHeaderStatement().yangVersionStatement() == null) {
+            yangModule.setVersion((byte) 1);
+        }
+
+        if (ctx.moduleBody().revisionStatements().revisionStatement().isEmpty()) {
+            String currentDate = setCurrentDateForRevision();
+            YangRevision currentRevision = new YangRevision();
+            currentRevision.setRevDate(currentDate);
+            yangModule.setRevision(currentRevision);
+        }
+
+        listener.getParsedDataStack().push(yangModule);
+    }
+
+    /**
+     * It is called when parser exits from grammar rule (module), it perform
+     * validations and update the data model tree.
+     *
+     * @param listener Listener's object
+     * @param ctx      context object of the grammar rule
+     */
+    public static void processModuleExit(TreeWalkListener listener, GeneratedYangParser.ModuleStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, MODULE_DATA, ctx.identifier().getText(), EXIT);
+
+        if (!(listener.getParsedDataStack().peek() instanceof YangModule)) {
+            throw new ParserException(constructListenerErrorMessage(MISSING_CURRENT_HOLDER, MODULE_DATA,
+                    ctx.identifier().getText(), EXIT));
+        }
+        try {
+            ((YangReferenceResolver) listener.getParsedDataStack()
+                    .peek()).resolveSelfFileLinking(ResolvableType.YANG_USES);
+            ((YangReferenceResolver) listener.getParsedDataStack()
+                    .peek()).resolveSelfFileLinking(ResolvableType.YANG_DERIVED_DATA_TYPE);
+        } catch (DataModelException e) {
+            LinkerException linkerException = new LinkerException(e.getMessage());
+            linkerException.setLine(e.getLineNumber());
+            linkerException.setCharPosition(e.getCharPositionInLine());
+            throw linkerException;
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/NamespaceListener.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/NamespaceListener.java
new file mode 100644
index 0000000..f32a4ed
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/NamespaceListener.java
@@ -0,0 +1,120 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import java.net.URI;
+
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangNameSpace;
+import org.onosproject.yangutils.datamodel.utils.Parsable;
+import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.TreeWalkListener;
+
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.NAMESPACE_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.ENTRY;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty;
+
+/*
+ * Reference: RFC6020 and YANG ANTLR Grammar
+ *
+ * ABNF grammar as per RFC6020
+ * module-header-stmts = ;; these stmts can appear in any order
+ *                       [yang-version-stmt stmtsep]
+ *                        namespace-stmt stmtsep
+ *                        prefix-stmt stmtsep
+ *
+ * namespace-stmt      = namespace-keyword sep uri-str optsep stmtend
+ *
+ * ANTLR grammar rule
+ * module_header_statement : yang_version_stmt? namespace_stmt prefix_stmt
+ *                         | yang_version_stmt? prefix_stmt namespace_stmt
+ *                         | namespace_stmt yang_version_stmt? prefix_stmt
+ *                         | namespace_stmt prefix_stmt yang_version_stmt?
+ *                         | prefix_stmt namespace_stmt yang_version_stmt?
+ *                         | prefix_stmt yang_version_stmt? namespace_stmt
+ *                         ;
+ * namespace_stmt : NAMESPACE_KEYWORD string STMTEND;
+ */
+
+/**
+ * Represents listener based call back function corresponding to the "namespace"
+ * rule defined in ANTLR grammar file for corresponding ABNF rule in RFC 6020.
+ */
+public final class NamespaceListener {
+
+    /**
+     * Creates a new namespace listener.
+     */
+    private NamespaceListener() {
+    }
+
+    /**
+     * It is called when parser receives an input matching the grammar rule
+     * (namespace), perform validations and update the data model tree.
+     *
+     * @param listener Listener's object
+     * @param ctx context object of the grammar rule
+     */
+    public static void processNamespaceEntry(TreeWalkListener listener,
+            GeneratedYangParser.NamespaceStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, NAMESPACE_DATA, ctx.string().getText(), ENTRY);
+
+        if (!validateUriValue(ctx.string().getText())) {
+            ParserException parserException = new ParserException("YANG file error: Invalid namespace URI");
+            parserException.setLine(ctx.string().STRING(0).getSymbol().getLine());
+            parserException.setCharPosition(ctx.string().STRING(0).getSymbol().getCharPositionInLine());
+            throw parserException;
+        }
+
+        // Obtain the node of the stack.
+        Parsable tmpNode = listener.getParsedDataStack().peek();
+        switch (tmpNode.getYangConstructType()) {
+            case MODULE_DATA: {
+                YangModule module = (YangModule) tmpNode;
+                YangNameSpace uri = new YangNameSpace();
+                uri.setUri(ctx.string().getText());
+                module.setNameSpace(uri);
+                break;
+            }
+            default:
+                throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, NAMESPACE_DATA,
+                        ctx.string().getText(), ENTRY));
+        }
+    }
+
+    /**
+     * Validate input URI.
+     *
+     * @param uri input namespace URI
+     * @return validation result
+     */
+    private static boolean validateUriValue(String uri) {
+        uri = uri.replace("\"", "");
+        try {
+            URI.create(uri);
+        } catch (Exception e1) {
+            return false;
+        }
+        return true;
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/NotificationListener.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/NotificationListener.java
new file mode 100644
index 0000000..6088ab4
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/NotificationListener.java
@@ -0,0 +1,165 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangNotification;
+import org.onosproject.yangutils.datamodel.YangSubModule;
+import org.onosproject.yangutils.datamodel.exceptions.DataModelException;
+import org.onosproject.yangutils.datamodel.utils.Parsable;
+import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.TreeWalkListener;
+
+import static org.onosproject.yangutils.datamodel.utils.GeneratedLanguage.JAVA_GENERATION;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.DESCRIPTION_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.GROUPING_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.NOTIFICATION_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.REFERENCE_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.STATUS_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.TYPEDEF_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerCollisionDetector.detectCollidingChildUtil;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.ENTRY;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.EXIT;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructExtendedListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_CURRENT_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.UNHANDLED_PARSED_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerUtil.getValidIdentifier;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.validateCardinalityMaxOne;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.validateMutuallyExclusiveChilds;
+import static org.onosproject.yangutils.translator.tojava.YangDataModelFactory.getYangNotificationNode;
+
+/*
+ * Reference: RFC6020 and YANG ANTLR Grammar
+ *
+ * ABNF grammar as per RFC6020
+ *  notification-stmt   = notification-keyword sep
+ *                        identifier-arg-str optsep
+ *                        (";" /
+ *                         "{" stmtsep
+ *                             ;; these stmts can appear in any order
+ *                             *(if-feature-stmt stmtsep)
+ *                             [status-stmt stmtsep]
+ *                             [description-stmt stmtsep]
+ *                             [reference-stmt stmtsep]
+ *                             *((typedef-stmt /
+ *                                grouping-stmt) stmtsep)
+ *                             *(data-def-stmt stmtsep)
+ *                         "}")
+ *
+ * ANTLR grammar rule
+ *    notificationStatement : NOTIFICATION_KEYWORD identifier (STMTEND | LEFT_CURLY_BRACE (ifFeatureStatement
+ *                          | statusStatement | descriptionStatement | referenceStatement | typedefStatement
+ *                          | groupingStatement | dataDefStatement)* RIGHT_CURLY_BRACE);
+ */
+
+/**
+ * Represents listener based call back function corresponding to the "notification"
+ * rule defined in ANTLR grammar file for corresponding ABNF rule in RFC 6020.
+ */
+public final class NotificationListener {
+
+    /**
+     * Creates a new notification listener.
+     */
+    private NotificationListener() {
+    }
+
+    /**
+     * It is called when parser receives an input matching the grammar rule
+     * (notification), performs validation and updates the data model tree.
+     *
+     * @param listener listener's object
+     * @param ctx context object of the grammar rule
+     */
+    public static void processNotificationEntry(TreeWalkListener listener,
+                                       GeneratedYangParser.NotificationStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, NOTIFICATION_DATA, ctx.identifier().getText(), ENTRY);
+
+        String identifier = getValidIdentifier(ctx.identifier().getText(), NOTIFICATION_DATA, ctx);
+
+        // Validate sub statement cardinality.
+        validateSubStatementsCardinality(ctx);
+
+        // Check for identifier collision
+        int line = ctx.getStart().getLine();
+        int charPositionInLine = ctx.getStart().getCharPositionInLine();
+        detectCollidingChildUtil(listener, line, charPositionInLine, identifier, NOTIFICATION_DATA);
+
+        Parsable curData = listener.getParsedDataStack().peek();
+        if (curData instanceof YangModule || curData instanceof YangSubModule) {
+
+            YangNotification notification = getYangNotificationNode(JAVA_GENERATION);
+            notification.setName(identifier);
+            YangNode curNode = (YangNode) curData;
+            try {
+                curNode.addChild(notification);
+            } catch (DataModelException e) {
+                throw new ParserException(constructExtendedListenerErrorMessage(UNHANDLED_PARSED_DATA,
+                        NOTIFICATION_DATA, ctx.identifier().getText(), ENTRY, e.getMessage()));
+            }
+            listener.getParsedDataStack().push(notification);
+        } else {
+            throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, NOTIFICATION_DATA,
+                    ctx.identifier().getText(), ENTRY));
+        }
+    }
+
+    /**
+     * It is called when parser exits from grammar rule (notification), it perform
+     * validations and updates the data model tree.
+     *
+     * @param listener listener's object
+     * @param ctx context object of the grammar rule
+     */
+    public static void processNotificationExit(TreeWalkListener listener,
+                                      GeneratedYangParser.NotificationStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, NOTIFICATION_DATA, ctx.identifier().getText(), EXIT);
+
+        if (listener.getParsedDataStack().peek() instanceof YangNotification) {
+            listener.getParsedDataStack().pop();
+        } else {
+            throw new ParserException(constructListenerErrorMessage(MISSING_CURRENT_HOLDER, NOTIFICATION_DATA,
+                    ctx.identifier().getText(), EXIT));
+        }
+    }
+
+    /**
+     * Validates the cardinality of notification sub-statements as per grammar.
+     *
+     * @param ctx context object of the grammar rule
+     */
+    private static void validateSubStatementsCardinality(GeneratedYangParser.NotificationStatementContext ctx) {
+
+        validateCardinalityMaxOne(ctx.statusStatement(), STATUS_DATA, NOTIFICATION_DATA, ctx.identifier().getText());
+        validateCardinalityMaxOne(ctx.descriptionStatement(), DESCRIPTION_DATA, NOTIFICATION_DATA,
+                ctx.identifier().getText());
+        validateCardinalityMaxOne(ctx.referenceStatement(), REFERENCE_DATA, NOTIFICATION_DATA,
+                ctx.identifier().getText());
+        validateMutuallyExclusiveChilds(ctx.typedefStatement(), TYPEDEF_DATA, ctx.groupingStatement(), GROUPING_DATA,
+                NOTIFICATION_DATA, ctx.identifier().getText());
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/OrganizationListener.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/OrganizationListener.java
new file mode 100644
index 0000000..20a42c1
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/OrganizationListener.java
@@ -0,0 +1,119 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangSubModule;
+import org.onosproject.yangutils.datamodel.utils.Parsable;
+import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.TreeWalkListener;
+
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.ORGANIZATION_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.ENTRY;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty;
+
+/*
+ * Reference: RFC6020 and YANG ANTLR Grammar
+ *
+ * ABNF grammar as per RFC6020
+ * meta-stmts          = ;; these stmts can appear in any order
+ *                       [organization-stmt stmtsep]
+ *                       [contact-stmt stmtsep]
+ *                       [description-stmt stmtsep]
+ *                       [reference-stmt stmtsep]
+ * organization-stmt   = organization-keyword sep string
+ *                            optsep stmtend
+ *
+ * ANTLR grammar rule
+ * meta_stmts : organization_stmt? contact_stmt? description_stmt? reference_stmt?
+ *            | organization_stmt? contact_stmt? reference_stmt? description_stmt?
+ *            | organization_stmt? description_stmt? contact_stmt? reference_stmt?
+ *            | organization_stmt? description_stmt? reference_stmt? contact_stmt?
+ *            | organization_stmt? reference_stmt? contact_stmt? description_stmt?
+ *            | organization_stmt? reference_stmt? description_stmt? contact_stmt?
+ *            | contact_stmt? organization_stmt? description_stmt? reference_stmt?
+ *            | contact_stmt? organization_stmt? reference_stmt? description_stmt?
+ *            | contact_stmt? reference_stmt? organization_stmt? description_stmt?
+ *            | contact_stmt? reference_stmt? description_stmt? organization_stmt?
+ *            | contact_stmt? description_stmt? reference_stmt? organization_stmt?
+ *            | contact_stmt? description_stmt? organization_stmt? reference_stmt?
+ *            | reference_stmt? contact_stmt? organization_stmt? description_stmt?
+ *            | reference_stmt? contact_stmt? description_stmt? organization_stmt?
+ *            | reference_stmt? organization_stmt? contact_stmt? description_stmt?
+ *            | reference_stmt? organization_stmt? description_stmt? contact_stmt?
+ *            | reference_stmt? description_stmt? organization_stmt? contact_stmt?
+ *            | reference_stmt? description_stmt? contact_stmt? organization_stmt?
+ *            | description_stmt? reference_stmt? contact_stmt? organization_stmt?
+ *            | description_stmt? reference_stmt? organization_stmt? contact_stmt?
+ *            | description_stmt? contact_stmt? reference_stmt? organization_stmt?
+ *            | description_stmt? contact_stmt? organization_stmt? reference_stmt?
+ *            | description_stmt? organization_stmt? contact_stmt? reference_stmt?
+ *            | description_stmt? organization_stmt? reference_stmt? contact_stmt?
+ *            ;
+ * organization_stmt : ORGANIZATION_KEYWORD string STMTEND;
+ */
+
+/**
+ * Represents listener based call back function corresponding to the
+ * "organization" rule defined in ANTLR grammar file for corresponding ABNF rule
+ * in RFC 6020.
+ */
+public final class OrganizationListener {
+
+    /**
+     * Creates a new organization listener.
+     */
+    private OrganizationListener() {
+    }
+
+    /**
+     * It is called when parser receives an input matching the grammar rule
+     * (organization), perform validations and update the data model tree.
+     *
+     * @param listener Listener's object
+     * @param ctx context object of the grammar rule
+     */
+    public static void processOrganizationEntry(TreeWalkListener listener,
+                                                GeneratedYangParser.OrganizationStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, ORGANIZATION_DATA, ctx.string().getText(),
+                             ENTRY);
+
+        // Obtain the node of the stack.
+        Parsable tmpNode = listener.getParsedDataStack().peek();
+        switch (tmpNode.getYangConstructType()) {
+            case MODULE_DATA: {
+                YangModule module = (YangModule) tmpNode;
+                module.setOrganization(ctx.string().getText());
+                break;
+            }
+            case SUB_MODULE_DATA: {
+                YangSubModule subModule = (YangSubModule) tmpNode;
+                subModule.setOrganization(ctx.string().getText());
+                break;
+            }
+            default:
+                throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, ORGANIZATION_DATA,
+                        ctx.string().getText(), ENTRY));
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/OutputListener.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/OutputListener.java
new file mode 100644
index 0000000..d0ef568
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/OutputListener.java
@@ -0,0 +1,129 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangOutput;
+import org.onosproject.yangutils.datamodel.YangRpc;
+import org.onosproject.yangutils.datamodel.exceptions.DataModelException;
+import org.onosproject.yangutils.datamodel.utils.Parsable;
+import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.TreeWalkListener;
+
+import static org.onosproject.yangutils.datamodel.utils.GeneratedLanguage.JAVA_GENERATION;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.OUTPUT_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.ENTRY;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.EXIT;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction
+        .constructExtendedListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction
+        .constructListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_CURRENT_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.UNHANDLED_PARSED_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty;
+import static org.onosproject.yangutils.translator.tojava.YangDataModelFactory.getYangOutputNode;
+
+/*
+ * Reference: RFC6020 and YANG ANTLR Grammar
+ *
+ * ABNF grammar as per RFC6020
+ *
+ *  output-stmt         = output-keyword optsep
+ *                        "{" stmtsep
+ *                            ;; these stmts can appear in any order
+ *                            *((typedef-stmt /
+ *                               grouping-stmt) stmtsep)
+ *                            1*(data-def-stmt stmtsep)
+ *                        "}"
+ *
+ *  outputStatement : OUTPUT_KEYWORD LEFT_CURLY_BRACE outputStatementBody RIGHT_CURLY_BRACE;
+
+ *  outputStatementBody : typedefStatement* dataDefStatement+
+ *                      | dataDefStatement+ typedefStatement*
+ *                      | groupingStatement* dataDefStatement+
+ *                      | dataDefStatement+ groupingStatement*;
+ */
+
+/**
+ * Represents listener based call back function corresponding to the "output"
+ * rule defined in ANTLR grammar file for corresponding ABNF rule in RFC 6020.
+ */
+public final class OutputListener {
+
+    private static final String OUTPUT_KEYWORD = "_output";
+
+    /**
+     * Creates a new output listener.
+     */
+    private OutputListener() {
+    }
+
+    /**
+     * It is called when parser receives an input matching the grammar rule
+     * (output), performs validation and updates the data model tree.
+     *
+     * @param listener listener's object
+     * @param ctx context object of the grammar rule
+     */
+    public static void processOutputEntry(TreeWalkListener listener,
+            GeneratedYangParser.OutputStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, OUTPUT_DATA, "", ENTRY);
+
+        Parsable curData = listener.getParsedDataStack().peek();
+        if (curData instanceof YangRpc) {
+
+            YangOutput yangOutput = getYangOutputNode(JAVA_GENERATION);
+            yangOutput.setName(((YangRpc) curData).getName() + OUTPUT_KEYWORD);
+            YangNode curNode = (YangNode) curData;
+            try {
+                curNode.addChild(yangOutput);
+            } catch (DataModelException e) {
+                throw new ParserException(constructExtendedListenerErrorMessage(UNHANDLED_PARSED_DATA,
+                        OUTPUT_DATA, "", ENTRY, e.getMessage()));
+            }
+            listener.getParsedDataStack().push(yangOutput);
+        } else {
+            throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, OUTPUT_DATA,
+                    "", ENTRY));
+        }
+    }
+
+    /**
+     * It is called when parser exits from grammar rule (output), it perform
+     * validations and updates the data model tree.
+     *
+     * @param listener listener's object
+     * @param ctx context object of the grammar rule
+     */
+    public static void processOutputExit(TreeWalkListener listener,
+            GeneratedYangParser.OutputStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, OUTPUT_DATA, "", EXIT);
+
+        if (!(listener.getParsedDataStack().peek() instanceof YangOutput)) {
+            throw new ParserException(constructListenerErrorMessage(MISSING_CURRENT_HOLDER, OUTPUT_DATA,
+                    "", EXIT));
+        }
+        listener.getParsedDataStack().pop();
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/PatternRestrictionListener.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/PatternRestrictionListener.java
new file mode 100644
index 0000000..26ff6d1
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/PatternRestrictionListener.java
@@ -0,0 +1,191 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import java.util.regex.Pattern;
+import java.util.regex.PatternSyntaxException;
+import org.onosproject.yangutils.datamodel.YangDataTypes;
+import org.onosproject.yangutils.datamodel.YangDerivedInfo;
+import org.onosproject.yangutils.datamodel.YangPatternRestriction;
+import org.onosproject.yangutils.datamodel.YangStringRestriction;
+import org.onosproject.yangutils.datamodel.YangType;
+import org.onosproject.yangutils.datamodel.utils.Parsable;
+import org.onosproject.yangutils.datamodel.utils.YangConstructType;
+import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.TreeWalkListener;
+
+import static org.onosproject.yangutils.datamodel.YangDataTypes.DERIVED;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.PATTERN_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.TYPE_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.ENTRY;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.EXIT;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_CURRENT_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty;
+
+/*
+ * Reference: RFC6020 and YANG ANTLR Grammar
+ *
+ * ABNF grammar as per RFC6020
+ *  pattern-stmt        = pattern-keyword sep string optsep
+ *                        (";" /
+ *                         "{" stmtsep
+ *                             ;; these stmts can appear in any order
+ *                             [error-message-stmt stmtsep]
+ *                             [error-app-tag-stmt stmtsep]
+ *                             [description-stmt stmtsep]
+ *                             [reference-stmt stmtsep]
+ *                          "}")
+ *
+ * ANTLR grammar rule
+ *  patternStatement : PATTERN_KEYWORD string (STMTEND | LEFT_CURLY_BRACE commonStatements RIGHT_CURLY_BRACE);
+ */
+
+/**
+ * Represents listener based call back function corresponding to the "pattern"
+ * rule defined in ANTLR grammar file for corresponding ABNF rule in RFC 6020.
+ */
+public final class PatternRestrictionListener {
+
+    private static final String EMPTY_STRING = "";
+
+    /**
+     * Creates a new pattern restriction listener.
+     */
+    private PatternRestrictionListener() {
+    }
+
+    /**
+     * It is called when parser receives an input matching the grammar
+     * rule (pattern), performs validation and updates the data model
+     * tree.
+     *
+     * @param listener listener's object
+     * @param ctx      context object of the grammar rule
+     */
+    public static void processPatternRestrictionEntry(TreeWalkListener listener,
+                                                      GeneratedYangParser.PatternStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, PATTERN_DATA, ctx.string().getText(), ENTRY);
+
+        Parsable tmpData = listener.getParsedDataStack().peek();
+        if (tmpData.getYangConstructType() == TYPE_DATA) {
+            YangType type = (YangType) tmpData;
+            setPatternRestriction(listener, type, ctx);
+        } else {
+            throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, PATTERN_DATA,
+                    ctx.string().getText(), ENTRY));
+        }
+    }
+
+    /**
+     * Sets the pattern restriction to type.
+     *
+     * @param listener listener's object
+     * @param type     Yang type for which pattern restriction to be set
+     * @param ctx      context object of the grammar rule
+     */
+    private static void setPatternRestriction(TreeWalkListener listener, YangType type,
+                                              GeneratedYangParser.PatternStatementContext ctx) {
+
+        if (type.getDataType() != YangDataTypes.STRING && type.getDataType() != YangDataTypes.DERIVED) {
+
+            ParserException parserException = new ParserException("YANG file error : " +
+                    YangConstructType.getYangConstructType(PATTERN_DATA) + " name " + ctx.string().getText() +
+                    " can be used to restrict the built-in type string or types derived from string.");
+            parserException.setLine(ctx.getStart().getLine());
+            parserException.setCharPosition(ctx.getStart().getCharPositionInLine());
+            throw parserException;
+        }
+
+        // Validate and get valid pattern restriction string.
+        String patternArgument = getValidPattern(ctx);
+
+        if (type.getDataType() == YangDataTypes.STRING) {
+            YangStringRestriction stringRestriction = (YangStringRestriction) type.getDataTypeExtendedInfo();
+            if (stringRestriction == null) {
+                stringRestriction = new YangStringRestriction();
+                type.setDataTypeExtendedInfo(stringRestriction);
+                stringRestriction.addPattern(patternArgument);
+            } else {
+                stringRestriction.addPattern(patternArgument);
+            }
+            listener.getParsedDataStack().push(stringRestriction);
+        } else {
+            YangPatternRestriction patternRestriction = (YangPatternRestriction) ((YangDerivedInfo<?>) type
+                    .getDataTypeExtendedInfo()).getPatternRestriction();
+            if (patternRestriction == null) {
+                patternRestriction = new YangPatternRestriction();
+                ((YangDerivedInfo<?>) type.getDataTypeExtendedInfo()).setPatternRestriction(patternRestriction);
+                patternRestriction.addPattern(patternArgument);
+            } else {
+                ((YangDerivedInfo<?>) type.getDataTypeExtendedInfo()).setPatternRestriction(patternRestriction);
+                patternRestriction.addPattern(patternArgument);
+            }
+        }
+    }
+
+    /**
+     * Performs validation and updates the data model tree.
+     * It is called when parser exits from grammar rule (pattern).
+     *
+     * @param listener listener's object
+     * @param ctx      context object of the grammar rule
+     */
+    public static void processPatternRestrictionExit(TreeWalkListener listener,
+                                                    GeneratedYangParser.PatternStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, PATTERN_DATA, ctx.string().getText(), EXIT);
+
+        Parsable tmpData = listener.getParsedDataStack().peek();
+        if (tmpData instanceof YangStringRestriction) {
+            listener.getParsedDataStack().pop();
+        } else if (tmpData instanceof YangType
+                && ((YangType) tmpData).getDataType() == DERIVED) {
+            // TODO : need to handle in linker
+        } else {
+            throw new ParserException(constructListenerErrorMessage(MISSING_CURRENT_HOLDER, PATTERN_DATA,
+                    ctx.string().getText(), EXIT));
+        }
+    }
+
+    /**
+     * Validates and return the valid pattern.
+     *
+     * @param ctx context object of the grammar rule
+     * @return validated string
+     */
+    private static String getValidPattern(GeneratedYangParser.PatternStatementContext ctx) {
+        String userInputPattern = ctx.string().getText().replace("\"", EMPTY_STRING);
+        try {
+            Pattern.compile(userInputPattern);
+        } catch (PatternSyntaxException exception) {
+            ParserException parserException = new ParserException("YANG file error : " +
+                    YangConstructType.getYangConstructType(PATTERN_DATA) + " name " + ctx.string().getText() +
+                    " is not a valid regular expression");
+            parserException.setLine(ctx.getStart().getLine());
+            parserException.setCharPosition(ctx.getStart().getCharPositionInLine());
+            throw parserException;
+        }
+        return userInputPattern;
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/PositionListener.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/PositionListener.java
new file mode 100644
index 0000000..4ae66bb
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/PositionListener.java
@@ -0,0 +1,131 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+/*
+ * Reference: RFC6020 and YANG ANTLR Grammar
+ *
+ * ABNF grammar as per RFC6020
+ * position-stmt       = position-keyword sep
+ *                       position-value-arg-str stmtend
+ * position-value-arg-str = < a string that matches the rule
+ *                            position-value-arg >
+ * position-value-arg  = non-negative-integer-value
+ * non-negative-integer-value = "0" / positive-integer-value
+ * positive-integer-value = (non-zero-digit *DIGIT)
+ * zero-integer-value  = 1*DIGIT
+ *
+ * ANTLR grammar rule
+ * positionStatement : POSITION_KEYWORD position STMTEND;
+ * position          : string;
+ */
+
+import org.onosproject.yangutils.datamodel.YangBit;
+import org.onosproject.yangutils.datamodel.YangBits;
+import org.onosproject.yangutils.datamodel.utils.Parsable;
+import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.TreeWalkListener;
+
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.POSITION_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.ENTRY;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerUtil.getValidNonNegativeIntegerValue;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty;
+
+/**
+ * Represents listener based call back function corresponding to the "position"
+ * rule defined in ANTLR grammar file for corresponding ABNF rule in RFC 6020.
+ */
+public final class PositionListener {
+
+    /**
+     * Creates a new position listener.
+     */
+    private PositionListener() {
+    }
+
+    /**
+     * It is called when parser receives an input matching the grammar rule
+     * (position), perform validations and update the data model tree.
+     *
+     * @param listener Listener's object
+     * @param ctx context object of the grammar rule
+     */
+    public static void processPositionEntry(TreeWalkListener listener,
+            GeneratedYangParser.PositionStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, POSITION_DATA, ctx.position().getText(), ENTRY);
+
+        // Obtain the node of the stack.
+        Parsable tmpNode = listener.getParsedDataStack().peek();
+        switch (tmpNode.getYangConstructType()) {
+            case BIT_DATA: {
+                YangBit bitNode = (YangBit) tmpNode;
+                int positionValue = getValidBitPosition(listener, ctx);
+                bitNode.setPosition(positionValue);
+                break;
+            }
+            default:
+                throw new ParserException(
+                        constructListenerErrorMessage(INVALID_HOLDER, POSITION_DATA, ctx.position().getText(), ENTRY));
+        }
+    }
+
+    /**
+     * Validates BITS position value correctness and uniqueness.
+     *
+     * @param listener Listener's object
+     * @param ctx context object of the grammar rule
+     * @return position value
+     */
+    private static int getValidBitPosition(TreeWalkListener listener,
+            GeneratedYangParser.PositionStatementContext ctx) {
+        Parsable bitNode = listener.getParsedDataStack().pop();
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, POSITION_DATA, ctx.position().getText(), ENTRY);
+
+        int positionValue = getValidNonNegativeIntegerValue(ctx.position().getText(), POSITION_DATA, ctx);
+
+        Parsable tmpNode = listener.getParsedDataStack().peek();
+        switch (tmpNode.getYangConstructType()) {
+            case BITS_DATA: {
+                YangBits yangBits = (YangBits) tmpNode;
+                for (YangBit curBit : yangBits.getBitSet()) {
+                    if (positionValue == curBit.getPosition()) {
+                        listener.getParsedDataStack().push(bitNode);
+                        ParserException parserException = new ParserException("YANG file error: Duplicate value of " +
+                                "position is invalid.");
+                        parserException.setLine(ctx.getStart().getLine());
+                        parserException.setCharPosition(ctx.getStart().getCharPositionInLine());
+                        throw parserException;
+                    }
+                }
+                listener.getParsedDataStack().push(bitNode);
+                return positionValue;
+            }
+            default:
+                listener.getParsedDataStack().push(bitNode);
+                throw new ParserException(
+                        constructListenerErrorMessage(INVALID_HOLDER, POSITION_DATA, ctx.position().getText(), ENTRY));
+        }
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/PrefixListener.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/PrefixListener.java
new file mode 100644
index 0000000..b75f77c
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/PrefixListener.java
@@ -0,0 +1,107 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import org.onosproject.yangutils.datamodel.YangBelongsTo;
+import org.onosproject.yangutils.datamodel.YangImport;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.utils.Parsable;
+import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.TreeWalkListener;
+
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.PREFIX_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.ENTRY;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerUtil.getValidIdentifier;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty;
+
+/*
+ * Reference: RFC6020 and YANG ANTLR Grammar
+ *
+ * ABNF grammar as per RFC6020
+ * module-header-stmts = ;; these stmts can appear in any order
+ *                       [yang-version-stmt stmtsep]
+ *                        namespace-stmt stmtsep
+ *                        prefix-stmt stmtsep
+ *
+ * prefix-stmt         = prefix-keyword sep prefix-arg-str
+ *                       optsep stmtend
+ *
+ * ANTLR grammar rule
+ * module_header_statement : yang_version_stmt? namespace_stmt prefix_stmt
+ *                         | yang_version_stmt? prefix_stmt namespace_stmt
+ *                         | namespace_stmt yang_version_stmt? prefix_stmt
+ *                         | namespace_stmt prefix_stmt yang_version_stmt?
+ *                         | prefix_stmt namespace_stmt yang_version_stmt?
+ *                         | prefix_stmt yang_version_stmt? namespace_stmt
+ *                         ;
+ * prefix_stmt : PREFIX_KEYWORD identifier STMTEND;
+ */
+
+/**
+ * Represents listener based call back function corresponding to the "prefix"
+ * rule defined in ANTLR grammar file for corresponding ABNF rule in RFC 6020.
+ */
+public final class PrefixListener {
+
+    /**
+     * Creates a new prefix listener.
+     */
+    private PrefixListener() {
+    }
+
+    /**
+     * It is called when parser receives an input matching the grammar rule
+     * (prefix),perform validations and update the data model tree.
+     *
+     * @param listener Listener's object
+     * @param ctx context object of the grammar rule
+     */
+    public static void processPrefixEntry(TreeWalkListener listener, GeneratedYangParser.PrefixStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, PREFIX_DATA, ctx.identifier().getText(), ENTRY);
+
+        String identifier = getValidIdentifier(ctx.identifier().getText(), PREFIX_DATA, ctx);
+
+        // Obtain the node of the stack.
+        Parsable tmpNode = listener.getParsedDataStack().peek();
+        switch (tmpNode.getYangConstructType()) {
+            case MODULE_DATA: {
+                YangModule module = (YangModule) tmpNode;
+                module.setPrefix(identifier);
+                break;
+            }
+            case IMPORT_DATA: {
+                YangImport importNode = (YangImport) tmpNode;
+                importNode.setPrefixId(identifier);
+                break;
+            }
+            case BELONGS_TO_DATA: {
+                YangBelongsTo belongstoNode = (YangBelongsTo) tmpNode;
+                belongstoNode.setPrefix(identifier);
+                break;
+            }
+            default:
+                throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, PREFIX_DATA,
+                        ctx.identifier().getText(), ENTRY));
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/PresenceListener.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/PresenceListener.java
new file mode 100644
index 0000000..ef744d5
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/PresenceListener.java
@@ -0,0 +1,78 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import org.onosproject.yangutils.datamodel.YangContainer;
+import org.onosproject.yangutils.datamodel.utils.Parsable;
+import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.TreeWalkListener;
+
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.CONTAINER_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.PRESENCE_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.ENTRY;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty;
+
+/*
+ * Reference: RFC6020 and YANG ANTLR Grammar
+ *
+ * ABNF grammar as per RFC6020
+ * presence-stmt       = presence-keyword sep string stmtend
+ *
+ * ANTLR grammar rule
+ * presenceStatement : PRESENCE_KEYWORD string STMTEND;
+ */
+
+/**
+ * Represents listener based call back function corresponding to the "presence"
+ * rule defined in ANTLR grammar file for corresponding ABNF rule in RFC 6020.
+ */
+public final class PresenceListener {
+
+    /**
+     * Creates a new presence listener.
+     */
+    private PresenceListener() {
+    }
+
+    /**
+     * It is called when parser receives an input matching the grammar
+     * rule (presence), performs validation and updates the data model
+     * tree.
+     *
+     * @param listener listener's object
+     * @param ctx context object of the grammar rule
+     */
+    public static void processPresenceEntry(TreeWalkListener listener,
+                                             GeneratedYangParser.PresenceStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, PRESENCE_DATA, ctx.string().getText(), ENTRY);
+
+        Parsable tmpData = listener.getParsedDataStack().peek();
+        if (tmpData.getYangConstructType() == CONTAINER_DATA) {
+            YangContainer container = (YangContainer) tmpData;
+            container.setPresence(ctx.string().getText());
+        } else {
+            throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, PRESENCE_DATA,
+                    ctx.string().getText(), ENTRY));
+        }
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/RangeRestrictionListener.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/RangeRestrictionListener.java
new file mode 100644
index 0000000..d7094ed
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/RangeRestrictionListener.java
@@ -0,0 +1,164 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import org.onosproject.yangutils.datamodel.YangDerivedInfo;
+import org.onosproject.yangutils.datamodel.YangRangeRestriction;
+import org.onosproject.yangutils.datamodel.YangType;
+import org.onosproject.yangutils.datamodel.exceptions.DataModelException;
+import org.onosproject.yangutils.datamodel.utils.Parsable;
+import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.TreeWalkListener;
+
+import static org.onosproject.yangutils.datamodel.YangDataTypes.DERIVED;
+import static org.onosproject.yangutils.datamodel.utils.RestrictionResolver.isOfRangeRestrictedType;
+import static org.onosproject.yangutils.datamodel.utils.RestrictionResolver.processRangeRestriction;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.RANGE_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.TYPE_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.ENTRY;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.EXIT;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_CURRENT_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty;
+
+/*
+ * Reference: RFC6020 and YANG ANTLR Grammar
+ *
+ * ABNF grammar as per RFC6020
+ *  range-stmt          = range-keyword sep range-arg-str optsep
+ *                        (";" /
+ *                         "{" stmtsep
+ *                             ;; these stmts can appear in any order
+ *                             [error-message-stmt stmtsep]
+ *                             [error-app-tag-stmt stmtsep]
+ *                             [description-stmt stmtsep]
+ *                             [reference-stmt stmtsep]
+ *                          "}")
+ *
+ * ANTLR grammar rule
+ *  rangeStatement : RANGE_KEYWORD range (STMTEND | LEFT_CURLY_BRACE commonStatements RIGHT_CURLY_BRACE);
+ */
+
+/**
+ * Represents listener based call back function corresponding to the "range"
+ * rule defined in ANTLR grammar file for corresponding ABNF rule in RFC 6020.
+ */
+public final class RangeRestrictionListener {
+
+    /**
+     * Creates a new range restriction listener.
+     */
+    private RangeRestrictionListener() {
+    }
+
+    /**
+     * It is called when parser receives an input matching the grammar
+     * rule (range), performs validation and updates the data model
+     * tree.
+     *
+     * @param listener listener's object
+     * @param ctx      context object of the grammar rule
+     */
+    public static void processRangeRestrictionEntry(TreeWalkListener listener,
+                                                    GeneratedYangParser.RangeStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, RANGE_DATA, ctx.range().getText(), ENTRY);
+
+        Parsable tmpData = listener.getParsedDataStack().peek();
+        if (tmpData.getYangConstructType() == TYPE_DATA) {
+            YangType type = (YangType) tmpData;
+            setRangeRestriction(listener, type, ctx);
+        } else {
+            throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, RANGE_DATA,
+                    ctx.range().getText(), ENTRY));
+        }
+    }
+
+    /**
+     * Sets the range restriction to type.
+     *
+     * @param listener listener's object
+     * @param type     YANG type for which range restriction to be added
+     * @param ctx      context object of the grammar rule
+     */
+    private static void setRangeRestriction(TreeWalkListener listener, YangType type,
+                                            GeneratedYangParser.RangeStatementContext ctx) {
+
+        if (type.getDataType() == DERIVED) {
+            ((YangDerivedInfo<YangRangeRestriction>) type.getDataTypeExtendedInfo())
+                    .setRangeRestrictionString(ctx.range().getText());
+            ((YangDerivedInfo<YangRangeRestriction>) type.getDataTypeExtendedInfo())
+                    .setLineNumber(ctx.getStart().getLine());
+            ((YangDerivedInfo<YangRangeRestriction>) type.getDataTypeExtendedInfo())
+                    .setCharPosition(ctx.getStart().getCharPositionInLine());
+            return;
+        }
+
+        if (!(isOfRangeRestrictedType(type.getDataType()))) {
+            ParserException parserException = new ParserException("YANG file error: Range restriction can't be " +
+                    "applied to a given type");
+            parserException.setLine(ctx.getStart().getLine());
+            parserException.setCharPosition(ctx.getStart().getCharPositionInLine());
+            throw parserException;
+        }
+
+        YangRangeRestriction rangeRestriction = null;
+        try {
+            rangeRestriction = processRangeRestriction(null, ctx.getStart().getLine(),
+                    ctx.getStart().getCharPositionInLine(), false, ctx.range().getText(), type.getDataType());
+        } catch (DataModelException e) {
+            ParserException parserException = new ParserException(e.getMessage());
+            parserException.setCharPosition(e.getCharPositionInLine());
+            parserException.setLine(e.getLineNumber());
+            throw parserException;
+        }
+
+        if (rangeRestriction != null) {
+            type.setDataTypeExtendedInfo(rangeRestriction);
+        }
+        listener.getParsedDataStack().push(rangeRestriction);
+    }
+
+    /**
+     * Performs validation and updates the data model tree.
+     * It is called when parser exits from grammar rule (range).
+     *
+     * @param listener listener's object
+     * @param ctx      context object of the grammar rule
+     */
+    public static void processRangeRestrictionExit(TreeWalkListener listener,
+                                                   GeneratedYangParser.RangeStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, RANGE_DATA, ctx.range().getText(), EXIT);
+
+        Parsable tmpData = listener.getParsedDataStack().peek();
+        if (tmpData instanceof YangRangeRestriction) {
+            listener.getParsedDataStack().pop();
+        } else if (tmpData instanceof YangType
+                && ((YangType) tmpData).getDataType() == DERIVED) {
+            // TODO : need to handle in linker
+        } else {
+            throw new ParserException(constructListenerErrorMessage(MISSING_CURRENT_HOLDER, RANGE_DATA,
+                    ctx.range().getText(), EXIT));
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/ReferenceListener.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/ReferenceListener.java
new file mode 100644
index 0000000..02cdf62
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/ReferenceListener.java
@@ -0,0 +1,77 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import org.onosproject.yangutils.datamodel.YangReference;
+import org.onosproject.yangutils.datamodel.utils.Parsable;
+import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.TreeWalkListener;
+
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.REFERENCE_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.ENTRY;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty;
+
+/*
+ * Reference: RFC6020 and YANG ANTLR Grammar
+ *
+ * ABNF grammar as per RFC6020
+ * reference-stmt      = reference-keyword sep string optsep stmtend
+ *
+ * ANTLR grammar rule
+ * referenceStatement : REFERENCE_KEYWORD string STMTEND;
+ */
+
+/**
+ * Represents listener based call back function corresponding to the "reference"
+ * rule defined in ANTLR grammar file for corresponding ABNF rule in RFC 6020.
+ */
+public final class ReferenceListener {
+
+    /**
+     * Creates a new reference listener.
+     */
+    private ReferenceListener() {
+    }
+
+    /**
+     * It is called when parser receives an input matching the grammar
+     * rule (reference), performs validation and updates the data model
+     * tree.
+     *
+     * @param listener listener's object
+     * @param ctx context object of the grammar rule
+     */
+    public static void processReferenceEntry(TreeWalkListener listener,
+                                             GeneratedYangParser.ReferenceStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, REFERENCE_DATA, ctx.string().getText(), ENTRY);
+
+        Parsable tmpData = listener.getParsedDataStack().peek();
+        if (tmpData instanceof YangReference) {
+            YangReference reference = (YangReference) tmpData;
+            reference.setReference(ctx.string().getText());
+        } else {
+            throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, REFERENCE_DATA,
+                            ctx.string().getText(), ENTRY));
+        }
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/RevisionDateListener.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/RevisionDateListener.java
new file mode 100644
index 0000000..bb701a6
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/RevisionDateListener.java
@@ -0,0 +1,116 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import org.onosproject.yangutils.datamodel.YangImport;
+import org.onosproject.yangutils.datamodel.YangInclude;
+import org.onosproject.yangutils.datamodel.utils.Parsable;
+import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.TreeWalkListener;
+
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.REVISION_DATE_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.ENTRY;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerUtil.isDateValid;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerUtil.removeQuotesAndHandleConcat;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty;
+
+/*
+ * Reference: RFC6020 and YANG ANTLR Grammar
+ *
+ * ABNF grammar as per RFC6020
+ * import-stmt         = import-keyword sep identifier-arg-str optsep
+ *                       "{" stmtsep
+ *                           prefix-stmt stmtsep
+ *                           [revision-date-stmt stmtsep]
+ *                        "}"
+ * include-stmt        = include-keyword sep identifier-arg-str optsep
+ *                             (";" /
+ *                              "{" stmtsep
+ *                                  [revision-date-stmt stmtsep]
+ *                            "}")
+ * revision-date-stmt = revision-date-keyword sep revision-date stmtend
+ *
+ * ANTLR grammar rule
+ * import_stmt : IMPORT_KEYWORD IDENTIFIER LEFT_CURLY_BRACE import_stmt_body
+ *               RIGHT_CURLY_BRACE;
+ * import_stmt_body : prefix_stmt revision_date_stmt?;
+ *
+ * include_stmt : INCLUDE_KEYWORD IDENTIFIER (STMTEND | LEFT_CURLY_BRACE
+ *                revision_date_stmt_body? RIGHT_CURLY_BRACE);
+ *
+ * revision_date_stmt : REVISION_DATE_KEYWORD DATE_ARG STMTEND;
+ *
+ */
+
+/**
+ * Represents listener based call back function corresponding to the
+ * "revision date" rule defined in ANTLR grammar file for corresponding ABNF
+ * rule in RFC 6020.
+ */
+public final class RevisionDateListener {
+
+    /**
+     * Creates a new revision date listener.
+     */
+    private RevisionDateListener() {
+    }
+
+    /**
+     * It is called when parser receives an input matching the grammar rule
+     * (revision date),perform validations and update the data model tree.
+     *
+     * @param listener Listener's object
+     * @param ctx context object of the grammar rule
+     */
+    public static void processRevisionDateEntry(TreeWalkListener listener,
+            GeneratedYangParser.RevisionDateStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, REVISION_DATE_DATA, ctx.dateArgumentString().getText(),
+                ENTRY);
+
+        String date = removeQuotesAndHandleConcat(ctx.dateArgumentString().getText());
+        if (!isDateValid(date)) {
+            ParserException parserException = new ParserException("YANG file error: Input date is not correct");
+            parserException.setLine(ctx.getStart().getLine());
+            parserException.setCharPosition(ctx.getStart().getCharPositionInLine());
+            throw parserException;
+        }
+
+        // Obtain the node of the stack.
+        Parsable tmpNode = listener.getParsedDataStack().peek();
+        switch (tmpNode.getYangConstructType()) {
+            case IMPORT_DATA: {
+                YangImport importNode = (YangImport) tmpNode;
+                importNode.setRevision(date);
+                break;
+            }
+            case INCLUDE_DATA: {
+                YangInclude includeNode = (YangInclude) tmpNode;
+                includeNode.setRevision(date);
+                break;
+            }
+            default:
+                throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, REVISION_DATE_DATA,
+                        ctx.dateArgumentString().getText(), ENTRY));
+        }
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/RevisionListener.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/RevisionListener.java
new file mode 100644
index 0000000..36d028a
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/RevisionListener.java
@@ -0,0 +1,168 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangRevision;
+import org.onosproject.yangutils.datamodel.YangSubModule;
+import org.onosproject.yangutils.datamodel.utils.Parsable;
+import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.TreeWalkListener;
+
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.REVISION_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.ENTRY;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.EXIT;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_CURRENT_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerUtil.isDateValid;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerUtil.removeQuotesAndHandleConcat;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty;
+
+/*
+ * Reference: RFC6020 and YANG ANTLR Grammar
+ *
+ * ABNF grammar as per RFC6020
+ * module-stmt         = optsep module-keyword sep identifier-arg-str
+ *                       optsep
+ *                       "{" stmtsep
+ *                           module-header-stmts
+ *                           linkage-stmts
+ *                           meta-stmts
+ *                           revision-stmts
+ *                           body-stmts
+ *                       "}" optsep
+ *
+ * revision-stmt       = revision-keyword sep revision-date optsep
+ *                             (";" /
+ *                              "{" stmtsep
+ *                                  [description-stmt stmtsep]
+ *                                  [reference-stmt stmtsep]
+ *                              "}")
+ *
+ * ANTLR grammar rule
+ * module_stmt : MODULE_KEYWORD IDENTIFIER LEFT_CURLY_BRACE module_body* RIGHT_CURLY_BRACE;
+ *
+ * revision_stmt : REVISION_KEYWORD DATE_ARG (STMTEND | LEFT_CURLY_BRACE revision_stmt_body RIGHT_CURLY_BRACE);
+ * revision_stmt_body : description_stmt? reference_stmt?;
+ */
+
+/**
+ * Represents listener based call back function corresponding to the "revision"
+ * rule defined in ANTLR grammar file for corresponding ABNF rule in RFC 6020.
+ */
+public final class RevisionListener {
+
+    /**
+     * Creates a new revision listener.
+     */
+    private RevisionListener() {
+    }
+
+    /**
+     * It is called when parser receives an input matching the grammar rule
+     * (revision),perform validations and update the data model tree.
+     *
+     * @param listener Listener's object
+     * @param ctx context object of the grammar rule
+     */
+    public static void processRevisionEntry(TreeWalkListener listener,
+                                            GeneratedYangParser.RevisionStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, REVISION_DATA, ctx.dateArgumentString().getText(), ENTRY);
+
+        // Validate for reverse chronological order of revision & for revision
+        // value.
+        if (!validateRevision(listener, ctx)) {
+            return;
+            // TODO to be implemented.
+        }
+
+        String date = removeQuotesAndHandleConcat(ctx.dateArgumentString().getText());
+        if (!isDateValid(date)) {
+            ParserException parserException = new ParserException("YANG file error: Input date is not correct");
+            parserException.setLine(ctx.getStart().getLine());
+            parserException.setCharPosition(ctx.getStart().getCharPositionInLine());
+            throw parserException;
+        }
+
+        YangRevision revisionNode = new YangRevision();
+        revisionNode.setRevDate(date);
+
+        listener.getParsedDataStack().push(revisionNode);
+    }
+
+    /**
+     * It is called when parser exits from grammar rule (revision), it perform
+     * validations and update the data model tree.
+     *
+     * @param listener Listener's object
+     * @param ctx context object of the grammar rule
+     */
+    public static void processRevisionExit(TreeWalkListener listener, GeneratedYangParser.RevisionStatementContext
+            ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, REVISION_DATA, ctx.dateArgumentString().getText(), EXIT);
+
+        Parsable tmpRevisionNode = listener.getParsedDataStack().peek();
+        if (tmpRevisionNode instanceof YangRevision) {
+            listener.getParsedDataStack().pop();
+
+            // Check for stack to be non empty.
+            checkStackIsNotEmpty(listener, MISSING_HOLDER, REVISION_DATA, ctx.dateArgumentString().getText(),
+                                 EXIT);
+
+            Parsable tmpNode = listener.getParsedDataStack().peek();
+            switch (tmpNode.getYangConstructType()) {
+                case MODULE_DATA: {
+                    YangModule module = (YangModule) tmpNode;
+                    module.setRevision((YangRevision) tmpRevisionNode);
+                    break;
+                }
+                case SUB_MODULE_DATA: {
+                    YangSubModule subModule = (YangSubModule) tmpNode;
+                    subModule.setRevision((YangRevision) tmpRevisionNode);
+                    break;
+                }
+                default:
+                    throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, REVISION_DATA,
+                            ctx.dateArgumentString().getText(),
+                            EXIT));
+            }
+        } else {
+            throw new ParserException(constructListenerErrorMessage(MISSING_CURRENT_HOLDER, REVISION_DATA,
+                                                                    ctx.dateArgumentString().getText(), EXIT));
+        }
+    }
+
+    /**
+     * Validate revision.
+     *
+     * @param listener Listener's object
+     * @param ctx context object of the grammar rule
+     * @return validation result
+     */
+    private static boolean validateRevision(TreeWalkListener listener,
+                                            GeneratedYangParser.RevisionStatementContext ctx) {
+        // TODO to be implemented
+        return true;
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/RpcListener.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/RpcListener.java
new file mode 100644
index 0000000..afb78a3
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/RpcListener.java
@@ -0,0 +1,164 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangRpc;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangSubModule;
+import org.onosproject.yangutils.datamodel.exceptions.DataModelException;
+import org.onosproject.yangutils.datamodel.utils.Parsable;
+import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.TreeWalkListener;
+
+import static org.onosproject.yangutils.datamodel.utils.GeneratedLanguage.JAVA_GENERATION;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.DESCRIPTION_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.GROUPING_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.INPUT_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.OUTPUT_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.REFERENCE_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.RPC_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.STATUS_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.TYPEDEF_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerCollisionDetector.detectCollidingChildUtil;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.ENTRY;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.EXIT;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructExtendedListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.*;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerUtil.getValidIdentifier;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.validateCardinalityMaxOne;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.validateMutuallyExclusiveChilds;
+import static org.onosproject.yangutils.translator.tojava.YangDataModelFactory.getYangRpcNode;
+
+/*
+ * Reference: RFC6020 and YANG ANTLR Grammar
+ *
+ * ABNF grammar as per RFC6020
+ *  rpc-stmt            = rpc-keyword sep identifier-arg-str optsep
+ *                        (";" /
+ *                         "{" stmtsep
+ *                             ;; these stmts can appear in any order
+ *                             *(if-feature-stmt stmtsep)
+ *                             [status-stmt stmtsep]
+ *                             [description-stmt stmtsep]
+ *                             [reference-stmt stmtsep]
+ *                             *((typedef-stmt /
+ *                                grouping-stmt) stmtsep)
+ *                             [input-stmt stmtsep]
+ *                             [output-stmt stmtsep]
+ *                         "}")
+ *
+ * ANTLR grammar rule
+ *  rpcStatement : RPC_KEYWORD identifier (STMTEND | LEFT_CURLY_BRACE (ifFeatureStatement | statusStatement
+ *               | descriptionStatement | referenceStatement | typedefStatement | groupingStatement | inputStatement
+ *               | outputStatement)* RIGHT_CURLY_BRACE);
+ */
+
+/**
+ * Represents listener based call back function corresponding to the "rpc"
+ * rule defined in ANTLR grammar file for corresponding ABNF rule in RFC 6020.
+ */
+public final class RpcListener {
+
+    /**
+     * Creates a new rpc listener.
+     */
+    private RpcListener() {
+    }
+
+    /**
+     * It is called when parser receives an input matching the grammar rule
+     * (rpc), performs validation and updates the data model tree.
+     *
+     * @param listener listener's object
+     * @param ctx context object of the grammar rule
+     */
+    public static void processRpcEntry(TreeWalkListener listener,
+                                             GeneratedYangParser.RpcStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, RPC_DATA, ctx.identifier().getText(), ENTRY);
+
+        String identifier = getValidIdentifier(ctx.identifier().getText(), RPC_DATA, ctx);
+
+        // Validate sub statement cardinality.
+        validateSubStatementsCardinality(ctx);
+
+        // Check for identifier collision
+        int line = ctx.getStart().getLine();
+        int charPositionInLine = ctx.getStart().getCharPositionInLine();
+        detectCollidingChildUtil(listener, line, charPositionInLine, identifier, RPC_DATA);
+
+        Parsable curData = listener.getParsedDataStack().peek();
+        if (curData instanceof YangModule || curData instanceof YangSubModule) {
+
+            YangNode curNode = (YangNode) curData;
+            YangRpc yangRpc = getYangRpcNode(JAVA_GENERATION);
+            yangRpc.setName(identifier);
+            try {
+                curNode.addChild(yangRpc);
+            } catch (DataModelException e) {
+                throw new ParserException(constructExtendedListenerErrorMessage(UNHANDLED_PARSED_DATA,
+                        RPC_DATA, ctx.identifier().getText(), ENTRY, e.getMessage()));
+            }
+            listener.getParsedDataStack().push(yangRpc);
+        } else {
+            throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, RPC_DATA,
+                    ctx.identifier().getText(), ENTRY));
+        }
+    }
+
+    /**
+     * It is called when parser exits from grammar rule (rpc), it perform
+     * validations and updates the data model tree.
+     *
+     * @param listener listener's object
+     * @param ctx context object of the grammar rule
+     */
+    public static void processRpcExit(TreeWalkListener listener,
+                                            GeneratedYangParser.RpcStatementContext ctx) {
+
+         //Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, RPC_DATA, ctx.identifier().getText(), EXIT);
+
+        if (!(listener.getParsedDataStack().peek() instanceof YangRpc)) {
+            throw new ParserException(constructListenerErrorMessage(MISSING_CURRENT_HOLDER, RPC_DATA,
+                    ctx.identifier().getText(), EXIT));
+        }
+        listener.getParsedDataStack().pop();
+    }
+
+    /**
+     * Validates the cardinality of rpc sub-statements as per grammar.
+     *
+     * @param ctx context object of the grammar rule
+     */
+    private static void validateSubStatementsCardinality(GeneratedYangParser.RpcStatementContext ctx) {
+
+        validateCardinalityMaxOne(ctx.statusStatement(), STATUS_DATA, RPC_DATA, ctx.identifier().getText());
+        validateCardinalityMaxOne(ctx.descriptionStatement(), DESCRIPTION_DATA, RPC_DATA, ctx.identifier().getText());
+        validateCardinalityMaxOne(ctx.referenceStatement(), REFERENCE_DATA, RPC_DATA, ctx.identifier().getText());
+        validateCardinalityMaxOne(ctx.inputStatement(), INPUT_DATA, RPC_DATA, ctx.identifier().getText());
+        validateCardinalityMaxOne(ctx.outputStatement(), OUTPUT_DATA, RPC_DATA, ctx.identifier().getText());
+        validateMutuallyExclusiveChilds(ctx.typedefStatement(), TYPEDEF_DATA, ctx.groupingStatement(), GROUPING_DATA,
+                RPC_DATA, ctx.identifier().getText());
+    }
+
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/ShortCaseListener.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/ShortCaseListener.java
new file mode 100644
index 0000000..612fe3b
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/ShortCaseListener.java
@@ -0,0 +1,146 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import org.antlr.v4.runtime.ParserRuleContext;
+import org.antlr.v4.runtime.tree.ParseTree;
+import org.onosproject.yangutils.datamodel.YangCase;
+import org.onosproject.yangutils.datamodel.YangChoice;
+import org.onosproject.yangutils.datamodel.exceptions.DataModelException;
+import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.TreeWalkListener;
+
+import static org.onosproject.yangutils.datamodel.utils.GeneratedLanguage.JAVA_GENERATION;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.CASE_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.SHORT_CASE_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerCollisionDetector.detectCollidingChildUtil;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.ENTRY;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.EXIT;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructExtendedListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_CHILD;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_CURRENT_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.UNHANDLED_PARSED_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerUtil.getValidIdentifier;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty;
+import static org.onosproject.yangutils.translator.tojava.YangDataModelFactory.getYangCaseNode;
+
+/*
+ * Reference: RFC6020 and YANG ANTLR Grammar
+ *
+ * ABNF grammar as per RFC6020
+ * short-case-stmt     = container-stmt /
+ *                       leaf-stmt /
+ *                       leaf-list-stmt /
+ *                       list-stmt /
+ *                       anyxml-stmt
+ *
+ * ANTLR grammar rule
+ * shortCaseStatement : containerStatement | leafStatement | leafListStatement | listStatement;
+ */
+
+/**
+ * Represents listener based call back function corresponding to the "short
+ * case" rule defined in ANTLR grammar file for corresponding ABNF rule in RFC
+ * 6020.
+ */
+public final class ShortCaseListener {
+
+    /**
+     * Create a new short case listener.
+     */
+    private ShortCaseListener() {
+    }
+
+    /**
+     * It is called when parser enters grammar rule (short case), it perform
+     * validations and updates the data model tree.
+     *
+     * @param listener listener's object
+     * @param ctx context object of the grammar rule
+     */
+    public static void processShortCaseEntry(TreeWalkListener listener,
+            GeneratedYangParser.ShortCaseStatementContext ctx) {
+
+        ParseTree errorConstructContext;
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, SHORT_CASE_DATA, "", ENTRY);
+
+        YangCase caseNode = getYangCaseNode(JAVA_GENERATION);
+
+        if (ctx.containerStatement() != null) {
+            caseNode.setName(getValidIdentifier(ctx.containerStatement().identifier().getText(), CASE_DATA, ctx));
+            errorConstructContext = ctx.containerStatement();
+        } else if (ctx.listStatement() != null) {
+            caseNode.setName(getValidIdentifier(ctx.listStatement().identifier().getText(), CASE_DATA, ctx));
+            errorConstructContext = ctx.listStatement();
+        } else if (ctx.leafListStatement() != null) {
+            caseNode.setName(getValidIdentifier(ctx.leafListStatement().identifier().getText(), CASE_DATA, ctx));
+            errorConstructContext = ctx.leafListStatement();
+        } else if (ctx.leafStatement() != null) {
+            caseNode.setName(getValidIdentifier(ctx.leafStatement().identifier().getText(), CASE_DATA, ctx));
+            errorConstructContext = ctx.leafStatement();
+        } else {
+            throw new ParserException(constructListenerErrorMessage(INVALID_CHILD, SHORT_CASE_DATA, "", ENTRY));
+        }
+        // TODO implement for augment.
+
+        int line = ((ParserRuleContext) errorConstructContext).getStart().getLine();
+        int charPositionInLine = ((ParserRuleContext) errorConstructContext).getStart().getCharPositionInLine();
+
+        // Check for identifier collision
+        detectCollidingChildUtil(listener, line, charPositionInLine, caseNode.getName(), CASE_DATA);
+
+        if ((listener.getParsedDataStack().peek()) instanceof YangChoice) {
+            try {
+                ((YangChoice) listener.getParsedDataStack().peek()).addChild(caseNode);
+            } catch (DataModelException e) {
+                throw new ParserException(constructExtendedListenerErrorMessage(UNHANDLED_PARSED_DATA,
+                        SHORT_CASE_DATA, caseNode.getName(), ENTRY, e.getMessage()));
+            }
+            listener.getParsedDataStack().push(caseNode);
+        } else {
+            throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, SHORT_CASE_DATA,
+                    caseNode.getName(), ENTRY));
+        }
+    }
+
+    /**
+     * It is called when parser exits from grammar rule (short case), it perform
+     * validations and update the data model tree.
+     *
+     * @param listener Listener's object
+     * @param ctx context object of the grammar rule
+     */
+    public static void processShortCaseExit(TreeWalkListener listener,
+            GeneratedYangParser.ShortCaseStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, SHORT_CASE_DATA, "", EXIT);
+
+        if (listener.getParsedDataStack().peek() instanceof YangCase) {
+            listener.getParsedDataStack().pop();
+        } else {
+            throw new ParserException(constructListenerErrorMessage(MISSING_CURRENT_HOLDER, SHORT_CASE_DATA,
+                    "", EXIT));
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/StatusListener.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/StatusListener.java
new file mode 100644
index 0000000..81d6b61
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/StatusListener.java
@@ -0,0 +1,127 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import org.onosproject.yangutils.datamodel.YangStatus;
+import org.onosproject.yangutils.datamodel.YangStatusType;
+import org.onosproject.yangutils.datamodel.utils.Parsable;
+import org.onosproject.yangutils.datamodel.utils.YangConstructType;
+import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.TreeWalkListener;
+
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.STATUS_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.ENTRY;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerUtil.removeQuotesAndHandleConcat;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty;
+
+/*
+ * Reference: RFC6020 and YANG ANTLR Grammar
+ *
+ * ABNF grammar as per RFC6020
+ *  status-stmt         = status-keyword sep status-arg-str stmtend
+ *  status-arg-str      = < a string that matches the rule
+ *                         status-arg >
+ *  status-arg          = current-keyword /
+ *                        obsolete-keyword /
+ *                        deprecated-keyword
+ *
+ * ANTLR grammar rule
+ * statusStatement : STATUS_KEYWORD status STMTEND;
+ */
+
+/**
+ * Represents listener based call back function corresponding to the "status"
+ * rule defined in ANTLR grammar file for corresponding ABNF rule in RFC 6020.
+ */
+public final class StatusListener {
+
+    private static final String CURRENT_KEYWORD = "current";
+    private static final String DEPRECATED_KEYWORD = "deprecated";
+    private static final String OBSOLETE_KEYWORD = "obsolete";
+
+    /**
+     * Creates a new status listener.
+     */
+    private StatusListener() {
+    }
+
+    /**
+     * It is called when parser receives an input matching the grammar
+     * rule (status), performs validation and updates the data model
+     * tree.
+     *
+     * @param listener listener's object
+     * @param ctx context object of the grammar rule
+     */
+    public static void processStatusEntry(TreeWalkListener listener,
+                                          GeneratedYangParser.StatusStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, STATUS_DATA, "", ENTRY);
+
+        YangStatusType status = getValidStatus(ctx);
+
+        Parsable tmpData = listener.getParsedDataStack().peek();
+        if (tmpData instanceof YangStatus) {
+            YangStatus yangStatus = (YangStatus) tmpData;
+            yangStatus.setStatus(status);
+        } else {
+            throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, STATUS_DATA, "", ENTRY));
+        }
+    }
+
+    /**
+     * Validates status value and returns the value from context.
+     *
+     * @param ctx context object of the grammar rule
+     * @return status current/deprecated/obsolete
+     */
+    private static YangStatusType getValidStatus(GeneratedYangParser.StatusStatementContext ctx) {
+
+        YangStatusType status;
+
+        String value = removeQuotesAndHandleConcat(ctx.status().getText());
+        switch (value) {
+            case CURRENT_KEYWORD: {
+                status = YangStatusType.CURRENT;
+                break;
+            }
+            case DEPRECATED_KEYWORD: {
+                status = YangStatusType.DEPRECATED;
+                break;
+            }
+            case OBSOLETE_KEYWORD: {
+                status = YangStatusType.OBSOLETE;
+                break;
+            }
+            default: {
+                ParserException parserException = new ParserException("YANG file error : " +
+                        YangConstructType.getYangConstructType(STATUS_DATA) + " " + ctx.status().getText() +
+                        " is not valid.");
+                parserException.setLine(ctx.getStart().getLine());
+                parserException.setCharPosition(ctx.getStart().getCharPositionInLine());
+                throw parserException;
+            }
+        }
+
+        return status;
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/SubModuleListener.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/SubModuleListener.java
new file mode 100644
index 0000000..639906a
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/SubModuleListener.java
@@ -0,0 +1,137 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import org.onosproject.yangutils.datamodel.ResolvableType;
+import org.onosproject.yangutils.datamodel.YangReferenceResolver;
+import org.onosproject.yangutils.datamodel.YangRevision;
+import org.onosproject.yangutils.datamodel.YangSubModule;
+import org.onosproject.yangutils.datamodel.exceptions.DataModelException;
+import org.onosproject.yangutils.linker.exceptions.LinkerException;
+import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.TreeWalkListener;
+
+import static org.onosproject.yangutils.datamodel.utils.GeneratedLanguage.JAVA_GENERATION;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.SUB_MODULE_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.ENTRY;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.EXIT;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_CURRENT_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerUtil.getValidIdentifier;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerUtil.setCurrentDateForRevision;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsEmpty;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty;
+import static org.onosproject.yangutils.translator.tojava.YangDataModelFactory.getYangSubModuleNode;
+
+/*
+ * Reference: RFC6020 and YANG ANTLR Grammar
+ *
+ * ABNF grammar as per RFC6020
+ * submodule-stmt      = optsep submodule-keyword sep identifier-arg-str
+ *                             optsep
+ *                             "{" stmtsep
+ *                                 submodule-header-stmts
+ *                                 linkage-stmts
+ *                                 meta-stmts
+ *                                 revision-stmts
+ *                                 body-stmts
+ *                             "}" optsep
+ *
+ * ANTLR grammar rule
+ * submodule_stmt : SUBMODULE_KEYWORD identifier LEFT_CURLY_BRACE submodule_body* RIGHT_CURLY_BRACE;
+ * submodule_body : submodule_header_statement linkage_stmts meta_stmts revision_stmts body_stmts;
+ */
+
+/**
+ * Represents listener based call back function corresponding to the "submodule"
+ * rule defined in ANTLR grammar file for corresponding ABNF rule in RFC 6020.
+ */
+public final class SubModuleListener {
+
+    /**
+     * Creates a new sub module listener.
+     */
+    private SubModuleListener() {
+    }
+
+    /**
+     * It is called when parser receives an input matching the grammar rule (sub
+     * module), perform validations and update the data model tree.
+     *
+     * @param listener Listener's object
+     * @param ctx      context object of the grammar rule
+     */
+    public static void processSubModuleEntry(TreeWalkListener listener,
+                                             GeneratedYangParser.SubModuleStatementContext ctx) {
+
+        // Check if stack is empty.
+        checkStackIsEmpty(listener, INVALID_HOLDER, SUB_MODULE_DATA, ctx.identifier().getText(),
+                ENTRY);
+
+        String identifier = getValidIdentifier(ctx.identifier().getText(), SUB_MODULE_DATA, ctx);
+
+        YangSubModule yangSubModule = getYangSubModuleNode(JAVA_GENERATION);
+        yangSubModule.setName(identifier);
+
+        if (ctx.submoduleBody().submoduleHeaderStatement().yangVersionStatement() == null) {
+            yangSubModule.setVersion((byte) 1);
+        }
+
+        if (ctx.submoduleBody().revisionStatements().revisionStatement().isEmpty()) {
+            String currentDate = setCurrentDateForRevision();
+            YangRevision currentRevision = new YangRevision();
+            currentRevision.setRevDate(currentDate);
+            yangSubModule.setRevision(currentRevision);
+        }
+
+        listener.getParsedDataStack().push(yangSubModule);
+    }
+
+    /**
+     * It is called when parser exits from grammar rule (submodule), it perform
+     * validations and update the data model tree.
+     *
+     * @param listener Listener's object
+     * @param ctx      context object of the grammar rule
+     */
+    public static void processSubModuleExit(TreeWalkListener listener,
+                                            GeneratedYangParser.SubModuleStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, SUB_MODULE_DATA, ctx.identifier().getText(),
+                EXIT);
+
+        if (!(listener.getParsedDataStack().peek() instanceof YangSubModule)) {
+            throw new ParserException(constructListenerErrorMessage(MISSING_CURRENT_HOLDER, SUB_MODULE_DATA,
+                    ctx.identifier().getText(), EXIT));
+        }
+        try {
+            ((YangReferenceResolver) listener.getParsedDataStack().peek())
+                    .resolveSelfFileLinking(ResolvableType.YANG_USES);
+            ((YangReferenceResolver) listener.getParsedDataStack().peek())
+                    .resolveSelfFileLinking(ResolvableType.YANG_DERIVED_DATA_TYPE);
+        } catch (DataModelException e) {
+            LinkerException linkerException = new LinkerException(e.getMessage());
+            linkerException.setLine(e.getLineNumber());
+            linkerException.setCharPosition(e.getCharPositionInLine());
+            throw linkerException;
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/TypeDefListener.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/TypeDefListener.java
new file mode 100644
index 0000000..4a629ba
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/TypeDefListener.java
@@ -0,0 +1,197 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import org.onosproject.yangutils.datamodel.YangContainer;
+import org.onosproject.yangutils.datamodel.YangGrouping;
+import org.onosproject.yangutils.datamodel.YangInput;
+import org.onosproject.yangutils.datamodel.YangList;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangNotification;
+import org.onosproject.yangutils.datamodel.YangOutput;
+import org.onosproject.yangutils.datamodel.YangRpc;
+import org.onosproject.yangutils.datamodel.YangSubModule;
+import org.onosproject.yangutils.datamodel.YangTypeDef;
+import org.onosproject.yangutils.datamodel.exceptions.DataModelException;
+import org.onosproject.yangutils.datamodel.utils.Parsable;
+import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.TreeWalkListener;
+
+import static org.onosproject.yangutils.datamodel.utils.GeneratedLanguage.JAVA_GENERATION;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.DEFAULT_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.DESCRIPTION_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.REFERENCE_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.STATUS_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.TYPEDEF_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.TYPE_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.UNITS_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerCollisionDetector.detectCollidingChildUtil;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.ENTRY;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.EXIT;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructExtendedListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_CONTENT;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_CURRENT_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.UNHANDLED_PARSED_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerUtil.getValidIdentifier;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.validateCardinalityEqualsOne;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.validateCardinalityMaxOne;
+import static org.onosproject.yangutils.translator.tojava.YangDataModelFactory.getYangTypeDefNode;
+
+/*
+ * Reference: RFC6020 and YANG ANTLR Grammar
+ *
+ * body-stmts          = *((extension-stmt /
+ *                          feature-stmt /
+ *                          identity-stmt /
+ *                          typedef-stmt /
+ *                          grouping-stmt /
+ *                          data-def-stmt /
+ *                          augment-stmt /
+ *                          rpc-stmt /
+ *                          notification-stmt /
+ *                          deviation-stmt) stmtsep)
+ *
+ * typedef-stmt        = typedef-keyword sep identifier-arg-str optsep
+ *                       "{" stmtsep
+ *                           ;; these stmts can appear in any order
+ *                           type-stmt stmtsep
+ *                          [units-stmt stmtsep]
+ *                           [default-stmt stmtsep]
+ *                           [status-stmt stmtsep]
+ *                           [description-stmt stmtsep]
+ *                           [reference-stmt stmtsep]
+ *                         "}"
+ *
+ * ANTLR grammar rule
+ * typedefStatement : TYPEDEF_KEYWORD identifier LEFT_CURLY_BRACE
+ *                (typeStatement | unitsStatement | defaultStatement | statusStatement
+ *                | descriptionStatement | referenceStatement)* RIGHT_CURLY_BRACE;
+ */
+
+/**
+ * Represents listener based call back function corresponding to the "typedef"
+ * rule defined in ANTLR grammar file for corresponding ABNF rule in RFC 6020.
+ */
+public final class TypeDefListener {
+
+    /**
+     * Creates a new typedef listener.
+     */
+    private TypeDefListener() {
+    }
+
+    /**
+     * It is called when parser enters grammar rule (typedef), it perform
+     * validations and updates the data model tree.
+     *
+     * @param listener listener's object
+     * @param ctx context object of the grammar rule
+     */
+    public static void processTypeDefEntry(TreeWalkListener listener,
+            GeneratedYangParser.TypedefStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, TYPEDEF_DATA, ctx.identifier().getText(), ENTRY);
+
+        String identifier = getValidIdentifier(ctx.identifier().getText(), TYPEDEF_DATA, ctx);
+
+        // Validate sub statement cardinality.
+        validateSubStatementsCardinality(ctx);
+
+        // Check for identifier collision
+        int line = ctx.getStart().getLine();
+        int charPositionInLine = ctx.getStart().getCharPositionInLine();
+        detectCollidingChildUtil(listener, line, charPositionInLine, identifier, TYPEDEF_DATA);
+
+        /*
+         * Create a derived type information, the base type must be set in type
+         * listener.
+         */
+        YangTypeDef typeDefNode = getYangTypeDefNode(JAVA_GENERATION);
+        typeDefNode.setName(identifier);
+
+        Parsable curData = listener.getParsedDataStack().peek();
+
+        if (curData instanceof YangModule || curData instanceof YangSubModule || curData instanceof YangContainer
+                || curData instanceof YangList || curData instanceof YangNotification || curData instanceof YangRpc
+                || curData instanceof YangInput || curData instanceof YangOutput || curData instanceof YangGrouping) {
+
+            YangNode curNode = (YangNode) curData;
+            try {
+                curNode.addChild(typeDefNode);
+            } catch (DataModelException e) {
+                throw new ParserException(constructExtendedListenerErrorMessage(UNHANDLED_PARSED_DATA,
+                        TYPEDEF_DATA, ctx.identifier().getText(), ENTRY, e.getMessage()));
+            }
+            listener.getParsedDataStack().push(typeDefNode);
+        } else {
+            throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER,
+                    TYPEDEF_DATA, ctx.identifier().getText(), ENTRY));
+        }
+    }
+
+    /**
+     * It is called when parser exits from grammar rule (typedef), it perform
+     * validations and updates the data model tree.
+     *
+     * @param listener listener's object
+     * @param ctx context object of the grammar rule
+     */
+    public static void processTypeDefExit(TreeWalkListener listener,
+            GeneratedYangParser.TypedefStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, TYPEDEF_DATA, ctx.identifier().getText(), EXIT);
+
+        if (listener.getParsedDataStack().peek() instanceof YangTypeDef) {
+            YangTypeDef typeDefNode = (YangTypeDef) listener.getParsedDataStack().peek();
+            try {
+                typeDefNode.validateDataOnExit();
+            } catch (DataModelException e) {
+                throw new ParserException(constructListenerErrorMessage(INVALID_CONTENT, TYPEDEF_DATA,
+                        ctx.identifier().getText(), EXIT));
+            }
+
+            listener.getParsedDataStack().pop();
+        } else {
+            throw new ParserException(constructListenerErrorMessage(MISSING_CURRENT_HOLDER, TYPEDEF_DATA,
+                    ctx.identifier().getText(), EXIT));
+        }
+    }
+
+    /**
+     * Validates the cardinality of typedef sub-statements as per grammar.
+     *
+     * @param ctx context object of the grammar rule
+     */
+    private static void validateSubStatementsCardinality(GeneratedYangParser.TypedefStatementContext ctx) {
+
+        validateCardinalityMaxOne(ctx.unitsStatement(), UNITS_DATA, TYPEDEF_DATA, ctx.identifier().getText());
+        validateCardinalityMaxOne(ctx.defaultStatement(), DEFAULT_DATA, TYPEDEF_DATA, ctx.identifier().getText());
+        validateCardinalityEqualsOne(ctx.typeStatement(), TYPE_DATA, TYPEDEF_DATA, ctx.identifier().getText(), ctx);
+        validateCardinalityMaxOne(ctx.descriptionStatement(), DESCRIPTION_DATA, TYPEDEF_DATA,
+                ctx.identifier().getText());
+        validateCardinalityMaxOne(ctx.referenceStatement(), REFERENCE_DATA, TYPEDEF_DATA, ctx.identifier().getText());
+        validateCardinalityMaxOne(ctx.statusStatement(), STATUS_DATA, TYPEDEF_DATA, ctx.identifier().getText());
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/TypeListener.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/TypeListener.java
new file mode 100644
index 0000000..ea14df2
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/TypeListener.java
@@ -0,0 +1,268 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import org.onosproject.yangutils.datamodel.YangDataTypes;
+import org.onosproject.yangutils.datamodel.YangDerivedInfo;
+import org.onosproject.yangutils.datamodel.YangLeaf;
+import org.onosproject.yangutils.datamodel.YangLeafList;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangNodeIdentifier;
+import org.onosproject.yangutils.datamodel.YangType;
+import org.onosproject.yangutils.datamodel.YangTypeDef;
+import org.onosproject.yangutils.datamodel.YangUnion;
+import org.onosproject.yangutils.datamodel.exceptions.DataModelException;
+import org.onosproject.yangutils.datamodel.utils.Parsable;
+import org.onosproject.yangutils.linker.impl.YangResolutionInfoImpl;
+import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.TreeWalkListener;
+
+import static org.onosproject.yangutils.datamodel.utils.DataModelUtils.addResolutionInfo;
+import static org.onosproject.yangutils.datamodel.utils.GeneratedLanguage.JAVA_GENERATION;
+import static org.onosproject.yangutils.datamodel.utils.ResolvableStatus.UNRESOLVED;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.TYPE_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.ENTRY;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.EXIT;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructExtendedListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_CURRENT_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.UNHANDLED_PARSED_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerUtil.getValidNodeIdentifier;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty;
+import static org.onosproject.yangutils.translator.tojava.YangDataModelFactory.getYangType;
+
+/*
+ * Reference: RFC6020 and YANG ANTLR Grammar
+ *
+ * ABNF grammar as per RFC6020
+ *  type-stmt           = type-keyword sep identifier-ref-arg-str optsep
+ *                        (";" /
+ *                         "{" stmtsep
+ *                            type-body-stmts
+ *                         "}")
+ *
+ * ANTLR grammar rule
+ * typeStatement : TYPE_KEYWORD string (STMTEND | LEFT_CURLY_BRACE typeBodyStatements RIGHT_CURLY_BRACE);
+ */
+
+/**
+ * Represents listener based call back function corresponding to the "type" rule
+ * defined in ANTLR grammar file for corresponding ABNF rule in RFC 6020.
+ */
+public final class TypeListener {
+
+    /**
+     * Creates a new type listener.
+     */
+    private TypeListener() {
+    }
+
+    /**
+     * It is called when parser receives an input matching the grammar rule
+     * (type), performs validation and updates the data model tree.
+     *
+     * @param listener listener's object
+     * @param ctx      context object of the grammar rule
+     */
+    public static void processTypeEntry(TreeWalkListener listener,
+                                        GeneratedYangParser.TypeStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, TYPE_DATA, ctx.string().getText(), ENTRY);
+
+        // Validate node identifier.
+        YangNodeIdentifier nodeIdentifier = getValidNodeIdentifier(ctx.string().getText(), TYPE_DATA,
+                ctx);
+
+        // Obtain the YANG data type.
+        YangDataTypes yangDataTypes = YangDataTypes.getType(ctx.string().getText());
+
+        // Create YANG type object and fill the values.
+        YangType<?> type = getYangType(JAVA_GENERATION);
+        type.setNodeIdentifier(nodeIdentifier);
+        type.setDataType(yangDataTypes);
+
+        int errorLine = ctx.getStart().getLine();
+        int errorPosition = ctx.getStart().getCharPositionInLine();
+
+        Parsable tmpData = listener.getParsedDataStack().peek();
+        switch (tmpData.getYangConstructType()) {
+            case LEAF_DATA:
+                YangLeaf leaf = (YangLeaf) tmpData;
+                leaf.setDataType(type);
+
+                /*
+                 * If data type is derived, resolution information to be added
+                 * in resolution list.
+                 */
+                if (yangDataTypes == YangDataTypes.DERIVED) {
+                    // Parent YANG node of leaf to be added in resolution information.
+                    Parsable leafData = listener.getParsedDataStack().pop();
+                    Parsable parentNodeOfLeaf = listener.getParsedDataStack().peek();
+                    listener.getParsedDataStack().push(leafData);
+
+                    // Verify parent node of leaf
+                    if (!(parentNodeOfLeaf instanceof YangNode)) {
+                        throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, TYPE_DATA,
+                                ctx.string().getText(), EXIT));
+                    }
+
+                    // Create empty derived info and attach it to type extended info.
+                    YangDerivedInfo<?> yangDerivedInfo = new YangDerivedInfo<>();
+                    ((YangType<YangDerivedInfo>) type).setDataTypeExtendedInfo(yangDerivedInfo);
+
+                    type.setResolvableStatus(UNRESOLVED);
+
+                    // Add resolution information to the list
+                    YangResolutionInfoImpl resolutionInfo = new YangResolutionInfoImpl<YangType>(type,
+                            (YangNode) parentNodeOfLeaf, errorLine, errorPosition);
+                    addToResolutionList(resolutionInfo, ctx);
+                }
+                break;
+            case LEAF_LIST_DATA:
+                YangLeafList leafList = (YangLeafList) tmpData;
+                leafList.setDataType(type);
+
+                /*
+                 * If data type is derived, resolution information to be added
+                 * in resolution list.
+                 */
+                if (yangDataTypes == YangDataTypes.DERIVED) {
+                    // Parent YANG node of leaf list to be added in resolution information.
+                    Parsable leafListData = listener.getParsedDataStack().pop();
+                    Parsable parentNodeOfLeafList = listener.getParsedDataStack().peek();
+                    listener.getParsedDataStack().push(leafListData);
+
+                    // Verify parent node of leaf
+                    if (!(parentNodeOfLeafList instanceof YangNode)) {
+                        throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, TYPE_DATA,
+                                ctx.string().getText(), EXIT));
+                    }
+
+                    // Create empty derived info and attach it to type extended info.
+                    YangDerivedInfo<?> yangDerivedInfo = new YangDerivedInfo<>();
+                    ((YangType<YangDerivedInfo>) type).setDataTypeExtendedInfo(yangDerivedInfo);
+
+                    // Add resolution information to the list
+                    YangResolutionInfoImpl resolutionInfo =
+                            new YangResolutionInfoImpl<YangType>(type, (YangNode) parentNodeOfLeafList, errorLine,
+                                    errorPosition);
+                    addToResolutionList(resolutionInfo, ctx);
+                }
+                break;
+            case UNION_DATA:
+                YangUnion unionNode = (YangUnion) tmpData;
+                try {
+                    unionNode.addType(type);
+                } catch (DataModelException e) {
+                    ParserException parserException = new ParserException(e.getMessage());
+                    parserException.setLine(ctx.getStart().getLine());
+                    parserException.setCharPosition(ctx.getStart().getCharPositionInLine());
+                    throw parserException;
+                }
+
+                /*
+                 * If data type is derived, resolution information to be added
+                 * in resolution list.
+                 */
+                if (yangDataTypes == YangDataTypes.DERIVED) {
+
+                    // Create empty derived info and attach it to type extended info.
+                    YangDerivedInfo<?> yangDerivedInfo = new YangDerivedInfo<>();
+                    ((YangType<YangDerivedInfo>) type).setDataTypeExtendedInfo(yangDerivedInfo);
+
+                    type.setResolvableStatus(UNRESOLVED);
+
+                    // Add resolution information to the list
+                    YangResolutionInfoImpl resolutionInfo =
+                            new YangResolutionInfoImpl<YangType>(type, unionNode, errorLine, errorPosition);
+                    addToResolutionList(resolutionInfo, ctx);
+                }
+
+                break;
+            case TYPEDEF_DATA:
+                /* Prepare the base type info and set in derived type */
+                YangTypeDef typeDef = (YangTypeDef) tmpData;
+                typeDef.setDataType(type);
+
+                /*
+                 * If data type is derived, resolution information to be added
+                 * in resolution list.
+                 */
+                if (yangDataTypes == YangDataTypes.DERIVED) {
+                    // Create empty derived info and attach it to type extended info.
+                    YangDerivedInfo<?> yangDerivedInfo = new YangDerivedInfo<>();
+                    ((YangType<YangDerivedInfo>) type).setDataTypeExtendedInfo(yangDerivedInfo);
+
+                    type.setResolvableStatus(UNRESOLVED);
+
+                    // Add resolution information to the list
+                    YangResolutionInfoImpl resolutionInfo =
+                            new YangResolutionInfoImpl<YangType>(type, typeDef, errorLine, errorPosition);
+                    addToResolutionList(resolutionInfo, ctx);
+                }
+                break;
+            //TODO: deviate replacement statement.
+
+            default:
+                throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, TYPE_DATA,
+                        ctx.string().getText(), EXIT));
+        }
+
+        // Push the type to the stack.
+        listener.getParsedDataStack().push(type);
+    }
+
+    /**
+     * It is called when parser exits from grammar rule (type), it perform
+     * validations and update the data model tree.
+     *
+     * @param listener Listener's object
+     * @param ctx      context object of the grammar rule
+     */
+    public static void processTypeExit(TreeWalkListener listener,
+                                       GeneratedYangParser.TypeStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_CURRENT_HOLDER, TYPE_DATA, ctx.string().getText(), EXIT);
+
+        Parsable parsableType = listener.getParsedDataStack().pop();
+        if (!(parsableType instanceof YangType)) {
+            throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, TYPE_DATA,
+                    ctx.string().getText(), EXIT));
+        }
+    }
+
+    /**
+     * Adds to resolution list.
+     *
+     * @param resolutionInfo resolution information
+     * @param ctx            context object of the grammar rule
+     */
+    private static void addToResolutionList(YangResolutionInfoImpl<YangType> resolutionInfo,
+                                            GeneratedYangParser.TypeStatementContext ctx) {
+        try {
+            addResolutionInfo(resolutionInfo);
+        } catch (DataModelException e) {
+            throw new ParserException(constructExtendedListenerErrorMessage(UNHANDLED_PARSED_DATA,
+                    TYPE_DATA, ctx.string().getText(), ENTRY, e.getMessage()));
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/UnionListener.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/UnionListener.java
new file mode 100644
index 0000000..32eb4d9
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/UnionListener.java
@@ -0,0 +1,220 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+/*
+ * Reference: RFC6020 and YANG ANTLR Grammar
+ *
+ * ABNF grammar as per RFC6020
+ * type-body-stmts     = numerical-restrictions /
+ *                       decimal64-specification /
+ *                      string-restrictions /
+ *                       enum-specification /
+ *                       leafref-specification /
+ *                       identityref-specification /
+ *                       instance-identifier-specification /
+ *                       bits-specification /
+ *                       union-specification
+ *
+ * union-specification = 1*(type-stmt stmtsep)
+ *
+ * ANTLR grammar rule
+ * typeBodyStatements : numericalRestrictions | stringRestrictions | enumSpecification
+ *                 | leafrefSpecification | identityrefSpecification | instanceIdentifierSpecification
+ *                 | bitsSpecification | unionSpecification;
+ *
+ * unionSpecification : typeStatement+;
+ */
+
+import org.onosproject.yangutils.datamodel.YangLeaf;
+import org.onosproject.yangutils.datamodel.YangLeafList;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangType;
+import org.onosproject.yangutils.datamodel.YangTypeDef;
+import org.onosproject.yangutils.datamodel.YangUnion;
+import org.onosproject.yangutils.datamodel.exceptions.DataModelException;
+import org.onosproject.yangutils.datamodel.utils.Parsable;
+import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.TreeWalkListener;
+
+import static org.onosproject.yangutils.datamodel.utils.GeneratedLanguage.JAVA_GENERATION;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.TYPE_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.UNION_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.ENTRY;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.EXIT;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructExtendedListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_CURRENT_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.UNHANDLED_PARSED_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty;
+import static org.onosproject.yangutils.translator.tojava.YangDataModelFactory.getYangUnionNode;
+
+/**
+ * Represents listener based call back function corresponding to the "union" rule
+ * defined in ANTLR grammar file for corresponding ABNF rule in RFC 6020.
+ */
+public final class UnionListener {
+
+    /**
+     * Suffix to be used while creating union class.
+     */
+    private static final String UNION_CLASS_SUFFIX = "_union";
+
+    /**
+     * Creates a new union listener.
+     */
+    private UnionListener() {
+    }
+
+    /**
+     * It is called when parser enters grammar rule (union), it perform
+     * validations and updates the data model tree.
+     *
+     * @param listener listener's object
+     * @param ctx      context object of the grammar rule
+     */
+    public static void processUnionEntry(TreeWalkListener listener,
+                                         GeneratedYangParser.UnionSpecificationContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, UNION_DATA, "", ENTRY);
+
+        if (listener.getParsedDataStack().peek() instanceof YangType) {
+            YangUnion unionNode = getYangUnionNode(JAVA_GENERATION);
+            Parsable typeData = listener.getParsedDataStack().pop();
+
+            // Check for stack to be non empty.
+            checkStackIsNotEmpty(listener, MISSING_HOLDER, UNION_DATA, "", ENTRY);
+
+            Parsable tmpData = listener.getParsedDataStack().peek();
+
+            switch (tmpData.getYangConstructType()) {
+                case LEAF_DATA:
+                    // Set the name of union same as leaf.
+                    unionNode.setName(((YangLeaf) tmpData).getName() + UNION_CLASS_SUFFIX);
+                    // Pop the stack entry to obtain the parent YANG node.
+                    Parsable leaf = listener.getParsedDataStack().pop();
+                    // Add the union node to the parent holder of leaf.
+                    addChildToParentNode(listener, unionNode);
+                    // Push the popped entry back to the stack.
+                    listener.getParsedDataStack().push(leaf);
+                    break;
+                case LEAF_LIST_DATA:
+                    // Set the name of union same as leaf list.
+                    unionNode.setName(((YangLeafList) tmpData).getName() + UNION_CLASS_SUFFIX);
+                    // Pop the stack entry to obtain the parent YANG node.
+                    Parsable leafList = listener.getParsedDataStack().pop();
+                    // Add the union node to the parent holder of leaf.
+                    addChildToParentNode(listener, unionNode);
+                    // Push the popped entry back to the stack.
+                    listener.getParsedDataStack().push(leafList);
+                    break;
+                case UNION_DATA:
+                    YangUnion parentUnion = (YangUnion) tmpData;
+                    /*
+                     * In case parent of union is again a union, name of the
+                     * child union is parent union name suffixed with running
+                     * integer number, this is done because under union there
+                     * could be multiple child union types.
+                     */
+                    unionNode.setName(parentUnion.getName() + UNION_CLASS_SUFFIX + parentUnion.getChildUnionNumber());
+                    // Increment the running number.
+                    parentUnion.setChildUnionNumber(parentUnion.getChildUnionNumber() + 1);
+                    // Add union as a child to parent union.
+                    addChildToParentNode(listener, unionNode);
+                    break;
+                case TYPEDEF_DATA:
+                    YangTypeDef typeDef = (YangTypeDef) tmpData;
+                    // Set the name of union same as typedef name.
+                    unionNode.setName(typeDef.getName() + UNION_CLASS_SUFFIX);
+                    // Add union as a child to parent type def.
+                    addChildToParentNode(listener, unionNode);
+                    break;
+                // TODO deviate.
+                default:
+                    throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, TYPE_DATA,
+                            ((YangType<?>) typeData).getDataTypeName(), ENTRY));
+            }
+            listener.getParsedDataStack().push(typeData);
+            listener.getParsedDataStack().push(unionNode);
+        } else {
+            throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, UNION_DATA, "", ENTRY));
+        }
+    }
+
+    /**
+     * It is called when parser exits from grammar rule (union), it perform
+     * validations and update the data model tree.
+     *
+     * @param listener Listener's object
+     * @param ctx      context object of the grammar rule
+     */
+    public static void processUnionExit(TreeWalkListener listener,
+                                       GeneratedYangParser.UnionSpecificationContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, UNION_DATA, "", EXIT);
+
+        Parsable tmpUnionNode = listener.getParsedDataStack().peek();
+        if (tmpUnionNode instanceof YangUnion) {
+            YangUnion unionNode = (YangUnion) tmpUnionNode;
+            listener.getParsedDataStack().pop();
+
+            // Check for stack to be non empty.
+            checkStackIsNotEmpty(listener, MISSING_HOLDER, UNION_DATA, "", EXIT);
+
+            Parsable tmpNode = listener.getParsedDataStack().peek();
+            switch (tmpNode.getYangConstructType()) {
+                case TYPE_DATA: {
+                    YangType<YangUnion> typeNode = (YangType<YangUnion>) tmpNode;
+                    typeNode.setDataTypeExtendedInfo(unionNode);
+                    break;
+                }
+                default:
+                    throw new ParserException(
+                            constructListenerErrorMessage(INVALID_HOLDER, UNION_DATA, "", EXIT));
+            }
+        } else {
+            throw new ParserException(
+                    constructListenerErrorMessage(MISSING_CURRENT_HOLDER, UNION_DATA, "", EXIT));
+        }
+    }
+
+    /**
+     * Adds the union node to the parent holder.
+     *
+     * @param listener listener's object
+     * @param unionNode union node which needs to be added to parent
+     */
+    private static void addChildToParentNode(TreeWalkListener listener, YangUnion unionNode) {
+        if (!(listener.getParsedDataStack().peek() instanceof YangNode)) {
+            throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, UNION_DATA,
+                    "", ENTRY));
+        } else {
+            YangNode curNode = (YangNode) listener.getParsedDataStack().peek();
+            try {
+                curNode.addChild(unionNode);
+            } catch (DataModelException e) {
+                throw new ParserException(constructExtendedListenerErrorMessage(UNHANDLED_PARSED_DATA,
+                        UNION_DATA, "", ENTRY, e.getMessage()));
+            }
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/UnitsListener.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/UnitsListener.java
new file mode 100644
index 0000000..e7acccf
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/UnitsListener.java
@@ -0,0 +1,87 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import org.onosproject.yangutils.datamodel.YangLeaf;
+import org.onosproject.yangutils.datamodel.YangLeafList;
+import org.onosproject.yangutils.datamodel.utils.Parsable;
+import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.TreeWalkListener;
+
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.UNITS_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.ENTRY;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty;
+
+/*
+ * Reference: RFC6020 and YANG ANTLR Grammar
+ *
+ * ABNF grammar as per RFC6020
+ * units-stmt          = units-keyword sep string optsep stmtend
+ *
+ * ANTLR grammar rule
+ * unitsStatement : UNITS_KEYWORD string STMTEND;
+ */
+
+/**
+ * Represents listener based call back function corresponding to the "units"
+ * rule defined in ANTLR grammar file for corresponding ABNF rule in RFC 6020.
+ */
+public final class UnitsListener {
+
+    /**
+     * Creates a new units listener.
+     */
+    private UnitsListener() {
+    }
+
+    /**
+     * It is called when parser receives an input matching the grammar
+     * rule (units), performs validation and updates the data model
+     * tree.
+     *
+     * @param listener listener's object
+     * @param ctx context object of the grammar rule
+     */
+    public static void processUnitsEntry(TreeWalkListener listener,
+                                           GeneratedYangParser.UnitsStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, UNITS_DATA, ctx.string().getText(), ENTRY);
+
+        Parsable tmpData = listener.getParsedDataStack().peek();
+        switch (tmpData.getYangConstructType()) {
+            case LEAF_DATA:
+                YangLeaf leaf = (YangLeaf) tmpData;
+                leaf.setUnits(ctx.string().getText());
+                break;
+            case LEAF_LIST_DATA:
+                YangLeafList leafList = (YangLeafList) tmpData;
+                leafList.setUnits(ctx.string().getText());
+                break;
+            case TYPEDEF_DATA:
+                // TODO
+                break;
+            default:
+                throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, UNITS_DATA,
+                                ctx.string().getText(), ENTRY));
+        }
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/UsesListener.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/UsesListener.java
new file mode 100644
index 0000000..2240c16
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/UsesListener.java
@@ -0,0 +1,223 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import org.onosproject.yangutils.datamodel.YangAugment;
+import org.onosproject.yangutils.datamodel.YangCase;
+import org.onosproject.yangutils.datamodel.YangContainer;
+import org.onosproject.yangutils.datamodel.YangGrouping;
+import org.onosproject.yangutils.datamodel.YangInput;
+import org.onosproject.yangutils.datamodel.YangList;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangNodeIdentifier;
+import org.onosproject.yangutils.datamodel.YangNotification;
+import org.onosproject.yangutils.datamodel.YangOutput;
+import org.onosproject.yangutils.datamodel.YangSubModule;
+import org.onosproject.yangutils.datamodel.YangUses;
+import org.onosproject.yangutils.datamodel.exceptions.DataModelException;
+import org.onosproject.yangutils.datamodel.utils.Parsable;
+import org.onosproject.yangutils.linker.impl.YangResolutionInfoImpl;
+import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.TreeWalkListener;
+
+import static org.onosproject.yangutils.datamodel.utils.DataModelUtils.addResolutionInfo;
+import static org.onosproject.yangutils.datamodel.utils.GeneratedLanguage.JAVA_GENERATION;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.DESCRIPTION_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.REFERENCE_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.STATUS_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.USES_DATA;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.WHEN_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerCollisionDetector.detectCollidingChildUtil;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.ENTRY;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.EXIT;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructExtendedListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.UNHANDLED_PARSED_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerUtil.getValidNodeIdentifier;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.validateCardinalityMaxOne;
+import static org.onosproject.yangutils.translator.tojava.YangDataModelFactory.getYangUsesNode;
+
+/*
+ * Reference: RFC6020 and YANG ANTLR Grammar
+ *
+ * ABNF grammar as per RFC6020
+ * data-def-stmt       = container-stmt /
+ *                      leaf-stmt /
+ *                      leaf-list-stmt /
+ *                      list-stmt /
+ *                      choice-stmt /
+ *                      anyxml-stmt /
+ *                      uses-stmt
+ *
+ * uses-stmt           = uses-keyword sep identifier-ref-arg-str optsep
+ *                       (";" /
+ *                        "{" stmtsep
+ *                            ;; these stmts can appear in any order
+ *                            [when-stmt stmtsep]
+ *                            *(if-feature-stmt stmtsep)
+ *                            [status-stmt stmtsep]
+ *                            [description-stmt stmtsep]
+ *                            [reference-stmt stmtsep]
+ *                            *(refine-stmt stmtsep)
+ *                            *(uses-augment-stmt stmtsep)
+ *                        "}")
+ *
+ * ANTLR grammar rule
+ * dataDefStatement : containerStatement
+ *                 | leafStatement
+ *                 | leafListStatement
+ *                 | listStatement
+ *                 | choiceStatement
+ *                 | usesStatement;
+ *
+ * usesStatement : USES_KEYWORD string (STMTEND | LEFT_CURLY_BRACE (whenStatement | ifFeatureStatement
+ *                 | statusStatement | descriptionStatement | referenceStatement | refineStatement
+ *                 | usesAugmentStatement)* RIGHT_CURLY_BRACE);
+ */
+
+/**
+ * Represents listener based call back function corresponding to the "uses"
+ * rule defined in ANTLR grammar file for corresponding ABNF rule in RFC 6020.
+ */
+public final class UsesListener {
+
+    /**
+     * Creates a new uses listener.
+     */
+    private UsesListener() {
+    }
+
+    /**
+     * It is called when parser enters grammar rule (uses), it perform
+     * validations and updates the data model tree.
+     *
+     * @param listener listener's object
+     * @param ctx      context object of the grammar rule
+     */
+    public static void processUsesEntry(TreeWalkListener listener, GeneratedYangParser.UsesStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, USES_DATA, ctx.string().getText(), ENTRY);
+
+        // Validate sub statement cardinality.
+        validateSubStatementsCardinality(ctx);
+
+        // Check for identifier collision
+        int line = ctx.getStart().getLine();
+        int charPositionInLine = ctx.getStart().getCharPositionInLine();
+
+        detectCollidingChildUtil(listener, line, charPositionInLine, ctx.string().getText(), USES_DATA);
+        Parsable curData = listener.getParsedDataStack().peek();
+
+        if (curData instanceof YangModule || curData instanceof YangSubModule
+                || curData instanceof YangContainer || curData instanceof YangList
+                || curData instanceof YangUses || curData instanceof YangAugment
+                || curData instanceof YangCase || curData instanceof YangGrouping
+                || curData instanceof YangInput || curData instanceof YangOutput
+                || curData instanceof YangNotification) {
+
+            YangUses usesNode = getYangUsesNode(JAVA_GENERATION);
+            YangNodeIdentifier nodeIdentifier = getValidNodeIdentifier(ctx.string().getText(), USES_DATA, ctx);
+            usesNode.setNodeIdentifier(nodeIdentifier);
+            YangNode curNode = (YangNode) curData;
+
+            try {
+                curNode.addChild(usesNode);
+            } catch (DataModelException e) {
+                throw new ParserException(constructExtendedListenerErrorMessage(UNHANDLED_PARSED_DATA,
+                        USES_DATA, ctx.string().getText(), ENTRY, e.getMessage()));
+            }
+            listener.getParsedDataStack().push(usesNode);
+        } else {
+            throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER,
+                    USES_DATA, ctx.string().getText(), ENTRY));
+        }
+    }
+
+    /**
+     * It is called when parser exits from grammar rule (uses), it perform
+     * validations and update the data model tree.
+     *
+     * @param listener Listener's object
+     * @param ctx      context object of the grammar rule
+     */
+    public static void processUsesExit(TreeWalkListener listener,
+                                       GeneratedYangParser.UsesStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, USES_DATA, ctx.string().getText(), EXIT);
+
+        Parsable parsableUses = listener.getParsedDataStack().pop();
+        if (!(parsableUses instanceof YangUses)) {
+            throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, USES_DATA,
+                    ctx.string().getText(), EXIT));
+        }
+        YangUses uses = (YangUses) parsableUses;
+        int errorLine = ctx.getStart().getLine();
+        int errorPosition = ctx.getStart().getCharPositionInLine();
+
+        // Parent YANG node of uses to be added in resolution information.
+        Parsable parentNode = listener.getParsedDataStack().peek();
+
+        // Verify parent node of leaf
+        if (!(parentNode instanceof YangNode)) {
+            throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, USES_DATA,
+                    ctx.string().getText(), EXIT));
+        }
+
+        // Add resolution information to the list
+        YangResolutionInfoImpl resolutionInfo = new YangResolutionInfoImpl<YangUses>(uses,
+                (YangNode) parentNode, errorLine,
+                errorPosition);
+        addToResolutionList(resolutionInfo, ctx);
+    }
+
+    // TODO linker to handle collision scenarios like leaf obtained by uses, conflicts with some existing leaf.
+
+    /**
+     * Validates the cardinality of case sub-statements as per grammar.
+     *
+     * @param ctx context object of the grammar rule
+     */
+    private static void validateSubStatementsCardinality(GeneratedYangParser.UsesStatementContext ctx) {
+        validateCardinalityMaxOne(ctx.whenStatement(), WHEN_DATA, USES_DATA, ctx.string().getText());
+        validateCardinalityMaxOne(ctx.statusStatement(), STATUS_DATA, USES_DATA, ctx.string().getText());
+        validateCardinalityMaxOne(ctx.descriptionStatement(), DESCRIPTION_DATA, USES_DATA, ctx.string().getText());
+        validateCardinalityMaxOne(ctx.referenceStatement(), REFERENCE_DATA, USES_DATA, ctx.string().getText());
+    }
+
+    /**
+     * Add to resolution list.
+     *
+     * @param resolutionInfo resolution information.
+     * @param ctx            context object of the grammar rule
+     */
+    private static void addToResolutionList(YangResolutionInfoImpl<YangUses> resolutionInfo,
+                                            GeneratedYangParser.UsesStatementContext ctx) {
+
+        try {
+            addResolutionInfo(resolutionInfo);
+        } catch (DataModelException e) {
+            throw new ParserException(constructExtendedListenerErrorMessage(UNHANDLED_PARSED_DATA,
+                    USES_DATA, ctx.string().getText(), EXIT, e.getMessage()));
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/ValueListener.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/ValueListener.java
new file mode 100644
index 0000000..39efa6b
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/ValueListener.java
@@ -0,0 +1,125 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+/*
+ * Reference: RFC6020 and YANG ANTLR Grammar
+ *
+ * ABNF grammar as per RFC6020
+ * value-stmt = value-keyword sep integer-value stmtend
+ *
+ * ANTLR grammar rule
+ * valueStatement : VALUE_KEYWORD ((MINUS INTEGER) | INTEGER) STMTEND;
+ */
+
+import org.onosproject.yangutils.datamodel.YangEnum;
+import org.onosproject.yangutils.datamodel.YangEnumeration;
+import org.onosproject.yangutils.datamodel.utils.Parsable;
+import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.TreeWalkListener;
+
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.VALUE_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.ENTRY;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerUtil.getValidIntegerValue;
+
+/**
+ * Represents listener based call back function corresponding to the "value"
+ * rule defined in ANTLR grammar file for corresponding ABNF rule in RFC 6020.
+ */
+public final class ValueListener {
+
+    /**
+     * Creates a new value listener.
+     */
+    private ValueListener() {
+    }
+
+    /**
+     * It is called when parser receives an input matching the grammar rule
+     * (value), perform validations and update the data model tree.
+     *
+     * @param listener Listener's object
+     * @param ctx context object of the grammar rule
+     */
+    public static void processValueEntry(TreeWalkListener listener, GeneratedYangParser.ValueStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, VALUE_DATA, ctx.value().getText(), ENTRY);
+
+        // Validate value
+        int value = getValidIntegerValue(ctx.value().getText(), VALUE_DATA, ctx);
+
+        // Obtain the node of the stack.
+        Parsable tmpNode = listener.getParsedDataStack().peek();
+        switch (tmpNode.getYangConstructType()) {
+            case ENUM_DATA: {
+                YangEnum enumNode = (YangEnum) tmpNode;
+                if (!isEnumValueValid(listener, ctx, value)) {
+                    ParserException parserException = new ParserException("Duplicate Value Entry");
+                    parserException.setLine(ctx.getStart().getLine());
+                    parserException.setCharPosition(ctx.getStart().getCharPositionInLine());
+                    throw parserException;
+                }
+                enumNode.setValue(value);
+                break;
+            }
+            default:
+                throw new ParserException(
+                        constructListenerErrorMessage(INVALID_HOLDER, VALUE_DATA, ctx.value().getText(), ENTRY));
+        }
+    }
+
+    /**
+     * Validates ENUM value uniqueness.
+     *
+     * @param listener Listener's object
+     * @param ctx context object of the grammar rule
+     * @param value enum value
+     * @return validation result
+     */
+    private static boolean isEnumValueValid(TreeWalkListener listener, GeneratedYangParser.ValueStatementContext ctx,
+            int value) {
+        Parsable enumNode = listener.getParsedDataStack().pop();
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, VALUE_DATA, ctx.value().getText(), ENTRY);
+
+        Parsable tmpNode = listener.getParsedDataStack().peek();
+        switch (tmpNode.getYangConstructType()) {
+            case ENUMERATION_DATA: {
+                YangEnumeration yangEnumeration = (YangEnumeration) tmpNode;
+                for (YangEnum curEnum : yangEnumeration.getEnumSet()) {
+                    if (value == curEnum.getValue()) {
+                        listener.getParsedDataStack().push(enumNode);
+                        return false;
+                    }
+                }
+                listener.getParsedDataStack().push(enumNode);
+                return true;
+            }
+            default:
+                listener.getParsedDataStack().push(enumNode);
+                throw new ParserException(
+                        constructListenerErrorMessage(INVALID_HOLDER, VALUE_DATA, ctx.value().getText(), ENTRY));
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/VersionListener.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/VersionListener.java
new file mode 100644
index 0000000..80caaa2
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/VersionListener.java
@@ -0,0 +1,112 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangSubModule;
+import org.onosproject.yangutils.datamodel.utils.Parsable;
+import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.TreeWalkListener;
+
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerUtil.getValidVersion;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.VERSION_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.ENTRY;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty;
+
+/*
+ * Reference: RFC6020 and YANG ANTLR Grammar
+ *
+ * ABNF grammar as per RFC6020
+ * module-header-stmts = ;; these stmts can appear in any order
+ *                       [yang-version-stmt stmtsep]
+ *                        namespace-stmt stmtsep
+ *                        prefix-stmt stmtsep
+ *
+ * submodule-header-stmts =
+ *                            ;; these stmts can appear in any order
+ *                            [yang-version-stmt stmtsep]
+ *                             belongs-to-stmt stmtsep
+ *
+ * yang-version-stmt   = yang-version-keyword sep yang-version-arg-str
+ *                       optsep stmtend
+ *
+ *
+ * ANTLR grammar rule
+ * module_header_statement : yang_version_stmt? namespace_stmt prefix_stmt
+ *                         | yang_version_stmt? prefix_stmt namespace_stmt
+ *                         | namespace_stmt yang_version_stmt? prefix_stmt
+ *                         | namespace_stmt prefix_stmt yang_version_stmt?
+ *                         | prefix_stmt namespace_stmt yang_version_stmt?
+ *                         | prefix_stmt yang_version_stmt? namespace_stmt?
+ *                         ;
+ * submodule_header_statement : yang_version_stmt? belongs_to_stmt
+ *                            | belongs_to_stmt yang_version_stmt?
+ *                            ;
+ * yang_version_stmt : YANG_VERSION_KEYWORD version STMTEND;
+ * version           : string;
+ */
+
+/**
+ * Represents listener based call back function corresponding to the "version"
+ * rule defined in ANTLR grammar file for corresponding ABNF rule in RFC 6020.
+ */
+public final class VersionListener {
+
+    /**
+     * Creates a new version listener.
+     */
+    private VersionListener() {
+    }
+
+    /**
+     * It is called when parser receives an input matching the grammar rule
+     * (version), perform validations and update the data model tree.
+     *
+     * @param listener Listener's object
+     * @param ctx context object of the grammar rule
+     */
+    public static void processVersionEntry(TreeWalkListener listener,
+                                           GeneratedYangParser.YangVersionStatementContext ctx) {
+
+        // Check for stack to be non empty.
+        checkStackIsNotEmpty(listener, MISSING_HOLDER, VERSION_DATA, ctx.version().getText(), ENTRY);
+
+        byte version = getValidVersion(ctx);
+
+        // Obtain the node of the stack.
+        Parsable tmpNode = listener.getParsedDataStack().peek();
+        switch (tmpNode.getYangConstructType()) {
+            case MODULE_DATA: {
+                YangModule module = (YangModule) tmpNode;
+                module.setVersion(version);
+                break;
+            }
+            case SUB_MODULE_DATA: {
+                YangSubModule subModule = (YangSubModule) tmpNode;
+                subModule.setVersion(version);
+                break;
+            }
+            default:
+                throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, VERSION_DATA,
+                        ctx.version().getText(), ENTRY));
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/package-info.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/package-info.java
new file mode 100644
index 0000000..240cd55
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/listeners/package-info.java
@@ -0,0 +1,20 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Provide call back functions for listeners based tree walk.
+ */
+package org.onosproject.yangutils.parser.impl.listeners;
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/package-info.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/package-info.java
new file mode 100644
index 0000000..d935f7b
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/package-info.java
@@ -0,0 +1,20 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+/**
+ * Parse the YANG information from ANTLR generated parse tree.
+ */
+package org.onosproject.yangutils.parser.impl;
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/parserutils/AugmentListenerUtil.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/parserutils/AugmentListenerUtil.java
new file mode 100644
index 0000000..1b2009e
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/parserutils/AugmentListenerUtil.java
@@ -0,0 +1,309 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.parserutils;
+
+import java.util.ArrayList;
+import java.util.List;
+
+import org.onosproject.yangutils.datamodel.CollisionDetector;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangNodeIdentifier;
+import org.onosproject.yangutils.datamodel.YangSubModule;
+import org.onosproject.yangutils.datamodel.exceptions.DataModelException;
+import org.onosproject.yangutils.datamodel.utils.Parsable;
+import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.TreeWalkListener;
+
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.AUGMENT_DATA;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaIdentifierSyntax.getCapitalCase;
+
+/**
+ * Represents a utility which provides listener utilities augment node.
+ */
+public final class AugmentListenerUtil {
+
+    /**
+     * Prefix to be added to generated java file for augment node.
+     */
+    private static final String AUGMENTED = "Augmented";
+
+    /**
+     * The number of time augment has updated the same target node in same module/submodule.
+     */
+    private static int occurrenceCount = 1;
+
+    /**
+     * List of names for augment's generated java file.
+     */
+    private static List<String> augmentJavaFileNameList = new ArrayList<>();
+
+    private static final int ONE = 1;
+    private static final int TWO = 2;
+    private static final int ZERO = 0;
+
+    /**
+     * Creates an instance of augment java file name generator utility.
+     */
+    private AugmentListenerUtil() {
+    }
+
+    /**
+     * Sets the augment java file name list.
+     *
+     * @param nameList name list
+     */
+    private static void setAugmentJavaFileNameList(List<String> nameList) {
+        augmentJavaFileNameList = nameList;
+    }
+
+    /**
+     * Returns augment java file name list.
+     *
+     * @return augment java file name list
+     */
+    public static List<String> getAugmentJavaFileNameList() {
+        return augmentJavaFileNameList;
+    }
+
+    /**
+     * Sets occurrence count.
+     *
+     * @param occurrence occurrence count
+     */
+    private static void setOccurrenceCount(int occurrence) {
+        occurrenceCount = occurrence;
+    }
+
+    /**
+     * Returns occurrence count.
+     *
+     * @return occurrence count
+     */
+    private static int getOccurrenceCount() {
+        return occurrenceCount;
+    }
+
+    /**
+     * Generates name for augment node also detects collision for java file generation of augment node when
+     * augment is updating the same target node in same parent multiple times.
+     *
+     * @param curData parsable data
+     * @param targetNodes list of target nodes
+     * @param listener tree walk listener
+     * @return name for augment node
+     */
+    public static String generateNameForAugmentNode(Parsable curData, List<YangNodeIdentifier> targetNodes,
+            TreeWalkListener listener) {
+
+        String curPrefix = getParentsPrefix((YangNode) curData);
+        YangNodeIdentifier nodeId = targetNodes.get(targetNodes.size() - 1);
+        boolean isPrefix = isPrefixPresent(nodeId, curPrefix);
+        String generateName = createValidNameForAugment(nodeId, isPrefix);
+
+        if (listener.getParsedDataStack().peek() instanceof CollisionDetector) {
+            try {
+                ((CollisionDetector) listener.getParsedDataStack().peek()).detectCollidingChild(generateName,
+                        AUGMENT_DATA);
+            } catch (DataModelException e) {
+                return updateNameWhenHasMultipleOuccrrence(nodeId, isPrefix);
+            }
+        }
+
+        clearOccurrenceCount();
+        return generateName;
+    }
+
+    /**
+     * Creates a name identifier for augment.
+     *
+     * @param nodeId node identifier
+     * @param isPrefix if prefix is present or it is not equals to parent's prefix
+     * @return valid name for augment
+     */
+    public static String createValidNameForAugment(YangNodeIdentifier nodeId, boolean isPrefix) {
+        getAugmentJavaFileNameList().add(createName(nodeId, isPrefix));
+        setAugmentJavaFileNameList(getAugmentJavaFileNameList());
+        return getAugmentJavaFileNameList().get(getAugmentJavaFileNameList().size() - 1);
+    }
+
+    /**
+     * Creates name for the current augment file.
+     *
+     * @param nodeId node identifier
+     * @param isPrefix if prefix is present or it is not equals to parent's prefix
+     */
+    private static String createName(YangNodeIdentifier nodeId, boolean isPrefix) {
+        if (isPrefix) {
+            return AUGMENTED + getCapitalCase(nodeId.getPrefix()) + getCapitalCase(nodeId.getName());
+        } else {
+            return AUGMENTED + getCapitalCase(nodeId.getName());
+        }
+    }
+
+    /**
+     * Updates occurrence count of augment.
+     */
+    private static void updateOccurenceCount() {
+        int count = getOccurrenceCount();
+        count++;
+        setOccurrenceCount(count);
+    }
+
+    /**
+     * Updates the list of name when augment has occurred multiple times to update the same target node
+     * and returns a valid name for augment node's generated java file.
+     *
+     * @param nodeId YANG node identifier
+     * @param isPrefix true if a prefix is present and it is not equals to parents prefix
+     * @return valid name for augment node
+     */
+    public static String updateNameWhenHasMultipleOuccrrence(YangNodeIdentifier nodeId, boolean isPrefix) {
+        String name = "";
+        updateOccurenceCount();
+
+        if (getOccurrenceCount() == TWO) {
+            String previousAugmentsName = getAugmentJavaFileNameList().get(getAugmentJavaFileNameList().size() - ONE);
+            getAugmentJavaFileNameList().remove(ZERO);
+            getAugmentJavaFileNameList().add(previousAugmentsName + ONE);
+            //TODO: update when already contains the name.
+            name = createName(nodeId, isPrefix) + TWO;
+        } else {
+            name = createName(nodeId, isPrefix) + getOccurrenceCount();
+        }
+        getAugmentJavaFileNameList().add(name);
+        return name;
+    }
+
+    /**
+     * Resets occurrence count to one.
+     */
+    public static void clearOccurrenceCount() {
+        setOccurrenceCount(ONE);
+    }
+
+    /**
+     * Returns true if a prefix is present and it is not equals to parents prefix.
+     *
+     * @param nodeId YANG node identifier
+     * @param parentsPrefix parent's prefix
+     * @return true if a prefix is present and it is not equals to parents prefix
+     */
+    private static boolean isPrefixPresent(YangNodeIdentifier nodeId, String parentsPrefix) {
+        return nodeId.getPrefix() != null && nodeId.getPrefix() != parentsPrefix;
+    }
+
+    /**
+     * Validates whether current node in target path is valid or not.
+     *
+     * @param curNode current YANG node
+     * @param targetNodes list of target nodes
+     * @param ctx augment statement context
+     */
+    public static void validateNodeInTargetPath(YangNode curNode, List<YangNodeIdentifier> targetNodes,
+            GeneratedYangParser.AugmentStatementContext ctx) {
+
+        curNode = curNode.getChild();
+        YangNode tempNode = validateCurrentTargetNode(targetNodes, curNode);
+        if (tempNode != null) {
+            switch (tempNode.getNodeType()) {
+                case CONTAINER_NODE:
+                    break;
+                case LIST_NODE:
+                    break;
+                case CHOICE_NODE:
+                    break;
+                case CASE_NODE:
+                    break;
+                case INPUT_NODE:
+                    break;
+                case OUTPUT_NODE:
+                    break;
+                case NOTIFICATION_NODE:
+                    break;
+                default:
+                    throw parserException(ctx);
+            }
+        } else {
+            throw parserException(ctx);
+        }
+    }
+
+    /**
+     * Validates whether nodes in target node list are valid or not.
+     *
+     * @param targetNodes target node
+     * @param curNode YANG node
+     * @return true or false
+     */
+    private static YangNode validateCurrentTargetNode(List<YangNodeIdentifier> targetNodes, YangNode curNode) {
+        YangNode tempNode = null;
+        while (curNode != null) {
+            tempNode = curNode;
+            for (int i = 1; i < targetNodes.size(); i++) {
+                if (curNode.getName().equals(targetNodes.get(i).getName())) {
+                    if (curNode.getChild() != null && targetNodes.size() - 1 != i) {
+                        curNode = curNode.getChild();
+                    } else if (curNode.getChild() != null && targetNodes.size() - 1 == i) {
+                        return curNode;
+                    } else if (curNode.getChild() == null && targetNodes.size() - 1 == i) {
+                        return curNode;
+                    } else {
+                        break;
+                    }
+                } else {
+                    curNode = tempNode;
+                    break;
+                }
+            }
+            curNode = curNode.getNextSibling();
+        }
+        return null;
+    }
+
+    /**
+     * Builds parser exception.
+     *
+     * @param ctx augment statement context
+     * @return parser exception
+     */
+    public static ParserException parserException(GeneratedYangParser.AugmentStatementContext ctx) {
+        int line = ctx.getStart().getLine();
+        int charPositionInLine = ctx.getStart().getCharPositionInLine();
+        ParserException exception = new ParserException("invalid target node path.");
+        exception.setLine(line);
+        exception.setCharPosition(charPositionInLine);
+        return exception;
+    }
+
+    /**
+     * Returns parent nodes prefix.
+     *
+     * @param curNode current YANG node
+     * @return parent nodes prefix
+     */
+    public static String getParentsPrefix(YangNode curNode) {
+        String curPrefix = null;
+        if (curNode instanceof YangModule) {
+            curPrefix = ((YangModule) curNode).getPrefix();
+        } else if (curNode instanceof YangSubModule) {
+            curPrefix = ((YangSubModule) curNode).getPrefix();
+        }
+        return curPrefix;
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/parserutils/ListenerCollisionDetector.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/parserutils/ListenerCollisionDetector.java
new file mode 100644
index 0000000..632f50d
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/parserutils/ListenerCollisionDetector.java
@@ -0,0 +1,73 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.parserutils;
+
+import org.onosproject.yangutils.datamodel.CollisionDetector;
+import org.onosproject.yangutils.datamodel.exceptions.DataModelException;
+import org.onosproject.yangutils.datamodel.utils.YangConstructType;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.TreeWalkListener;
+
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.EXIT;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_HOLDER;
+
+/**
+ * Represents the detector of YANG construct collision in a YANG file.
+ */
+public final class ListenerCollisionDetector {
+
+    /**
+     * Creates a new listener collision.
+     */
+    private ListenerCollisionDetector() {
+    }
+
+    /**
+     * Detects that the identifiers of all these child nodes must be unique
+     * within all cases in a choice.
+     *
+     * @param listener listener's object
+     * @param line line of identifier in YANG file, required for error
+     *            reporting
+     * @param charPosition character position of identifier in YANG file,
+     *            required for error reporting
+     * @param identifierName name for which uniqueness is to be detected
+     * @param constructType type of YANG construct for which collision check is
+     *            to be performed
+     * @throws ParserException if identifier is not unique
+     */
+    public static void detectCollidingChildUtil(TreeWalkListener listener, int line, int charPosition,
+            String identifierName, YangConstructType constructType)
+            throws ParserException {
+
+        if (listener.getParsedDataStack().peek() instanceof CollisionDetector) {
+            try {
+                ((CollisionDetector) listener.getParsedDataStack().peek()).detectCollidingChild(
+                        identifierName, constructType);
+            } catch (DataModelException e) {
+                ParserException parserException = new ParserException(e.getMessage());
+                parserException.setLine(line);
+                parserException.setCharPosition(charPosition);
+                throw parserException;
+            }
+        } else {
+            throw new ParserException(constructListenerErrorMessage(INVALID_HOLDER, constructType, identifierName,
+                    EXIT));
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/parserutils/ListenerErrorLocation.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/parserutils/ListenerErrorLocation.java
new file mode 100644
index 0000000..c1c2888
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/parserutils/ListenerErrorLocation.java
@@ -0,0 +1,50 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.parserutils;
+
+/**
+ * Represents listener error location.
+ */
+public enum ListenerErrorLocation {
+    /**
+     * Represents that the error location is before processing.
+     */
+    ENTRY(),
+
+    /**
+     * Represents that the error location is before processing.
+     */
+    EXIT();
+
+    /**
+     * Returns the message corresponding to listener error location.
+     *
+     * @param errorLocation enum value for type of error
+     * @return message corresponding to listener error location
+     */
+    public static String getErrorLocationMessage(ListenerErrorLocation errorLocation) {
+
+        switch (errorLocation) {
+            case ENTRY:
+                return "before";
+            case EXIT:
+                return "after";
+            default:
+                return "during";
+        }
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/parserutils/ListenerErrorMessageConstruction.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/parserutils/ListenerErrorMessageConstruction.java
new file mode 100644
index 0000000..15b2170
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/parserutils/ListenerErrorMessageConstruction.java
@@ -0,0 +1,92 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.parserutils;
+
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.getYangConstructType;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.getErrorLocationMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.getErrorType;
+
+import org.onosproject.yangutils.datamodel.utils.YangConstructType;
+
+/**
+ * Represents a utility to help construct detailed error message.
+ */
+public final class ListenerErrorMessageConstruction {
+
+    /**
+     * Creates a object of listen error message.
+     */
+    private ListenerErrorMessageConstruction() {
+    }
+
+    /**
+     * Constructs message for error with extended information and returns the
+     * same.
+     *
+     * @param errorType error type needs to be set in error message
+     * @param yangConstructType type of parsable data in which error occurred
+     * @param parsableDataTypeName identifier/string of parsable data type in
+     *            which error occurred
+     * @param errorLocation location where error occurred
+     * @param extendedErrorInformation extended error information
+     * @return constructed error message
+     */
+    public static String constructExtendedListenerErrorMessage(ListenerErrorType errorType,
+                                                               YangConstructType yangConstructType,
+                                                               String parsableDataTypeName,
+                                                               ListenerErrorLocation errorLocation,
+                                                               String extendedErrorInformation) {
+        String newErrorMessage;
+        newErrorMessage = constructListenerErrorMessage(errorType, yangConstructType, parsableDataTypeName,
+                                                        errorLocation)
+                + "\n"
+                + "Error Information: "
+                + extendedErrorInformation;
+        return newErrorMessage;
+    }
+
+    /**
+     * Constructs message for error during listener based tree walk and returns
+     * the same.
+     *
+     * @param errorType error type needs to be set in error message
+     * @param yangConstructType type of parsable data in which error occurred
+     * @param parsableDataTypeName identifier/string of parsable data type in
+     *            which error occurred
+     * @param errorLocation location where error occurred
+     * @return constructed error message
+     */
+    public static String constructListenerErrorMessage(ListenerErrorType errorType,
+                                                       YangConstructType yangConstructType,
+                                                       String parsableDataTypeName,
+                                                       ListenerErrorLocation errorLocation) {
+
+        String errorMessage;
+
+        errorMessage = "Internal parser error detected: " + getErrorType(errorType) + " "
+                + getYangConstructType(yangConstructType);
+
+        if (!parsableDataTypeName.isEmpty()) {
+            errorMessage = errorMessage + " \"" + parsableDataTypeName + "\" ";
+        } else {
+            errorMessage = errorMessage + " ";
+
+        }
+        errorMessage = errorMessage + getErrorLocationMessage(errorLocation) + " processing.";
+        return errorMessage;
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/parserutils/ListenerErrorType.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/parserutils/ListenerErrorType.java
new file mode 100644
index 0000000..f1cb284
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/parserutils/ListenerErrorType.java
@@ -0,0 +1,103 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.parserutils;
+
+/**
+ * Represents listener error type.
+ */
+public enum ListenerErrorType {
+    /**
+     * Represents the parent holder in parsable stack for given YANG construct
+     * is invalid.
+     */
+    INVALID_HOLDER(),
+
+    /**
+     * Represents the parent holder in parsable stack for given YANG construct
+     * is missing.
+     */
+    MISSING_HOLDER(),
+
+    /**
+     * Represents the current holder in parsable stack for given YANG construct
+     * is missing.
+     */
+    MISSING_CURRENT_HOLDER(),
+
+    /**
+     * Represents that the child in parsable stack for given YANG construct is
+     * invalid.
+     */
+    INVALID_CHILD(),
+
+    /**
+     * Represents that the cardinality for given YANG construct is invalid.
+     */
+    INVALID_CARDINALITY(),
+
+    /**
+     * Represents that the entry is duplicate.
+     */
+    DUPLICATE_ENTRY(),
+
+    /**
+     * Represents that the content is invalid.
+     */
+    INVALID_CONTENT(),
+
+    /**
+     * Represents that the identifier collision is detected.
+     */
+    IDENTIFIER_COLLISION(),
+
+    /**
+     * Represents that some of earlier parsed data is not handled correctly.
+     */
+    UNHANDLED_PARSED_DATA();
+
+    /**
+     * Returns the message corresponding to listener error type.
+     *
+     * @param errorType enum value for type of error
+     * @return message corresponding to listener error type
+     */
+    public static String getErrorType(ListenerErrorType errorType) {
+
+        switch (errorType) {
+            case INVALID_HOLDER:
+                return "Invalid holder for";
+            case MISSING_HOLDER:
+                return "Missing holder at";
+            case MISSING_CURRENT_HOLDER:
+                return "Missing";
+            case INVALID_CHILD:
+                return "Invalid child in";
+            case INVALID_CARDINALITY:
+                return "Invalid cardinality in";
+            case DUPLICATE_ENTRY:
+                return "Duplicate";
+            case INVALID_CONTENT:
+                return "Invalid content in";
+            case IDENTIFIER_COLLISION:
+                return "Identifier collision detected for";
+            case UNHANDLED_PARSED_DATA:
+                return "Unhandled parsed data at";
+            default:
+                return "Problem in";
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/parserutils/ListenerUtil.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/parserutils/ListenerUtil.java
new file mode 100644
index 0000000..d05c8d0
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/parserutils/ListenerUtil.java
@@ -0,0 +1,376 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.parserutils;
+
+import java.text.ParseException;
+import java.text.SimpleDateFormat;
+import java.util.Calendar;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.regex.Pattern;
+
+import org.antlr.v4.runtime.ParserRuleContext;
+import org.onosproject.yangutils.datamodel.YangNodeIdentifier;
+import org.onosproject.yangutils.datamodel.utils.YangConstructType;
+import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+
+import static org.onosproject.yangutils.utils.UtilConstants.ADD;
+import static org.onosproject.yangutils.utils.UtilConstants.SPACE;
+import static org.onosproject.yangutils.utils.UtilConstants.SLASH;
+import static org.onosproject.yangutils.utils.UtilConstants.COLON;
+import static org.onosproject.yangutils.utils.UtilConstants.CARET;
+import static org.onosproject.yangutils.utils.UtilConstants.CURRENTLY_UNSUPPORTED;
+import static org.onosproject.yangutils.utils.UtilConstants.QUOTES;
+import static org.onosproject.yangutils.utils.UtilConstants.HYPHEN;
+import static org.onosproject.yangutils.utils.UtilConstants.EMPTY_STRING;
+import static org.onosproject.yangutils.utils.UtilConstants.TRUE;
+import static org.onosproject.yangutils.utils.UtilConstants.FALSE;
+import static org.onosproject.yangutils.utils.UtilConstants.YANG_FILE_ERROR;
+import static org.onosproject.yangutils.utils.UtilConstants.IDENTITYREF;
+import static org.onosproject.yangutils.utils.UtilConstants.LEAFREF;
+import static org.onosproject.yangutils.utils.UtilConstants.INSTANCE_IDENTIFIER;
+
+/**
+ * Represents an utility for listener.
+ */
+public final class ListenerUtil {
+
+    private static final Pattern IDENTIFIER_PATTERN = Pattern.compile("[a-zA-Z_][a-zA-Z0-9_.-]*");
+    private static final String DATE_PATTERN = "[0-9]{4}-([0-9]{2}|[0-9])-([0-9]{2}|[0-9])";
+    private static final String NON_NEGATIVE_INTEGER_PATTERN = "[0-9]+";
+    private static final Pattern INTEGER_PATTERN = Pattern.compile("[-][0-9]+|[0-9]+");
+    private static final String XML = "xml";
+    private static final String ONE = "1";
+    private static final int IDENTIFIER_LENGTH = 64;
+    private static final String DATE_FORMAT = "yyyy-MM-dd";
+
+    /**
+     * Creates a new listener util.
+     */
+    private ListenerUtil() {
+    }
+
+    /**
+     * Removes doubles quotes and concatenates if string has plus symbol.
+     *
+     * @param yangStringData string from yang file
+     * @return concatenated string after removing double quotes
+     */
+    public static String removeQuotesAndHandleConcat(String yangStringData) {
+
+        yangStringData = yangStringData.replace("\"", EMPTY_STRING);
+        String[] tmpData = yangStringData.split(Pattern.quote(ADD));
+        StringBuilder builder = new StringBuilder();
+        for (String yangString : tmpData) {
+            builder.append(yangString);
+        }
+        return builder.toString();
+    }
+
+    /**
+     * Validates identifier and returns concatenated string if string contains plus symbol.
+     *
+     * @param identifier string from yang file
+     * @param yangConstruct yang construct for creating error message
+     * @param ctx yang construct's context to get the line number and character position
+     * @return concatenated string after removing double quotes
+     */
+    public static String getValidIdentifier(String identifier, YangConstructType yangConstruct, ParserRuleContext ctx) {
+
+        String identifierString = removeQuotesAndHandleConcat(identifier);
+        ParserException parserException;
+
+        if (identifierString.length() > IDENTIFIER_LENGTH) {
+            parserException = new ParserException("YANG file error : " +
+                    YangConstructType.getYangConstructType(yangConstruct) + " name " + identifierString + " is " +
+                    "greater than 64 characters.");
+        } else if (!IDENTIFIER_PATTERN.matcher(identifierString).matches()) {
+            parserException = new ParserException("YANG file error : " +
+                    YangConstructType.getYangConstructType(yangConstruct) + " name " + identifierString + " is not " +
+                    "valid.");
+        } else if (identifierString.toLowerCase().startsWith(XML)) {
+            parserException = new ParserException("YANG file error : " +
+                    YangConstructType.getYangConstructType(yangConstruct) + " identifier " + identifierString +
+                    " must not start with (('X'|'x') ('M'|'m') ('L'|'l')).");
+        } else {
+            return identifierString;
+        }
+
+        parserException.setLine(ctx.getStart().getLine());
+        parserException.setCharPosition(ctx.getStart().getCharPositionInLine());
+        throw parserException;
+    }
+
+    /**
+     * Validates the revision date.
+     *
+     * @param dateToValidate input revision date
+     * @return validation result, true for success, false for failure
+     */
+    public static boolean isDateValid(String dateToValidate) {
+        if (dateToValidate == null || !dateToValidate.matches(DATE_PATTERN)) {
+            return false;
+        }
+
+        SimpleDateFormat sdf = new SimpleDateFormat(DATE_FORMAT);
+        sdf.setLenient(false);
+
+        try {
+            //if not valid, it will throw ParseException
+            sdf.parse(dateToValidate);
+        } catch (ParseException e) {
+            return false;
+        }
+
+        return true;
+    }
+
+    /**
+     * Validates YANG version.
+     *
+     * @param ctx version context object of the grammar rule
+     * @return valid version
+     */
+    public static byte getValidVersion(GeneratedYangParser.YangVersionStatementContext ctx) {
+
+        String value = removeQuotesAndHandleConcat(ctx.version().getText());
+        if (!value.equals(ONE)) {
+            ParserException parserException = new ParserException("YANG file error: Input version not supported");
+            parserException.setLine(ctx.getStart().getLine());
+            parserException.setCharPosition(ctx.getStart().getCharPositionInLine());
+            throw parserException;
+        }
+
+        return Byte.valueOf(value);
+    }
+
+    /**
+     * Validates non negative integer value.
+     *
+     * @param integerValue integer to be validated
+     * @param yangConstruct yang construct for creating error message
+     * @param ctx context object of the grammar rule
+     * @return valid non negative integer value
+     */
+    public static int getValidNonNegativeIntegerValue(String integerValue, YangConstructType yangConstruct,
+            ParserRuleContext ctx) {
+
+        String value = removeQuotesAndHandleConcat(integerValue);
+        if (!value.matches(NON_NEGATIVE_INTEGER_PATTERN)) {
+            ParserException parserException = new ParserException("YANG file error : " +
+                    YangConstructType.getYangConstructType(yangConstruct) + " value " + value + " is not " +
+                    "valid.");
+            parserException.setLine(ctx.getStart().getLine());
+            parserException.setCharPosition(ctx.getStart().getCharPositionInLine());
+            throw parserException;
+        }
+
+        int valueInInteger;
+        try {
+            valueInInteger = Integer.parseInt(value);
+        } catch (NumberFormatException e) {
+            ParserException parserException = new ParserException("YANG file error : " +
+                    YangConstructType.getYangConstructType(yangConstruct) + " value " + value + " is not " +
+                    "valid.");
+            parserException.setLine(ctx.getStart().getLine());
+            parserException.setCharPosition(ctx.getStart().getCharPositionInLine());
+            throw parserException;
+        }
+        return valueInInteger;
+    }
+
+    /**
+     * Validates integer value.
+     *
+     * @param integerValue integer to be validated
+     * @param yangConstruct yang construct for creating error message
+     * @param ctx context object of the grammar rule
+     * @return valid integer value
+     */
+    public static int getValidIntegerValue(String integerValue, YangConstructType yangConstruct,
+                                                      ParserRuleContext ctx) {
+
+        String value = removeQuotesAndHandleConcat(integerValue);
+        if (!INTEGER_PATTERN.matcher(value).matches()) {
+            ParserException parserException = new ParserException("YANG file error : " +
+                    YangConstructType.getYangConstructType(yangConstruct) + " value " + value + " is not " +
+                    "valid.");
+            parserException.setLine(ctx.getStart().getLine());
+            parserException.setCharPosition(ctx.getStart().getCharPositionInLine());
+            throw parserException;
+        }
+
+        int valueInInteger;
+        try {
+            valueInInteger = Integer.parseInt(value);
+        } catch (NumberFormatException e) {
+            ParserException parserException = new ParserException("YANG file error : " +
+                    YangConstructType.getYangConstructType(yangConstruct) + " value " + value + " is not " +
+                    "valid.");
+            parserException.setLine(ctx.getStart().getLine());
+            parserException.setCharPosition(ctx.getStart().getCharPositionInLine());
+            throw parserException;
+        }
+        return valueInInteger;
+    }
+
+    /**
+     * Validates boolean value.
+     *
+     * @param booleanValue value to be validated
+     * @param yangConstruct yang construct for creating error message
+     * @param ctx context object of the grammar rule
+     * @return boolean value either true or false
+     */
+    public static boolean getValidBooleanValue(String booleanValue, YangConstructType yangConstruct,
+            ParserRuleContext ctx) {
+
+        String value = removeQuotesAndHandleConcat(booleanValue);
+        if (value.equals(TRUE)) {
+            return true;
+        } else if (value.equals(FALSE)) {
+            return false;
+        } else {
+            ParserException parserException = new ParserException("YANG file error : " +
+                    YangConstructType.getYangConstructType(yangConstruct) + " value " + value + " is not " +
+                    "valid.");
+            parserException.setLine(ctx.getStart().getLine());
+            parserException.setCharPosition(ctx.getStart().getCharPositionInLine());
+            throw parserException;
+        }
+    }
+
+    /**
+     * Sets current date and makes it in usable format for revision.
+     *
+     * @return usable current date format for revision
+     */
+    public static String setCurrentDateForRevision() {
+
+        Calendar date = Calendar.getInstance();
+        SimpleDateFormat dateFormat = new SimpleDateFormat(DATE_FORMAT);
+        String dateForRevision = dateFormat.format(date.getTime()).replaceAll(SLASH, HYPHEN).replaceAll(SPACE,
+                EMPTY_STRING);
+        return dateForRevision;
+    }
+
+    /**
+     * Checks and return valid node identifier.
+     *
+     * @param nodeIdentifierString string from yang file
+     * @param yangConstruct yang construct for creating error message
+     * @param ctx yang construct's context to get the line number and character position
+     * @return valid node identifier
+     */
+    public static YangNodeIdentifier getValidNodeIdentifier(String nodeIdentifierString,
+            YangConstructType yangConstruct, ParserRuleContext ctx) {
+        String tmpIdentifierString = removeQuotesAndHandleConcat(nodeIdentifierString);
+        String[] tmpData = tmpIdentifierString.split(Pattern.quote(COLON));
+        if (tmpData.length == 1) {
+            YangNodeIdentifier nodeIdentifier = new YangNodeIdentifier();
+            checkForUnsupportedTypes(tmpData[0], yangConstruct, ctx);
+            nodeIdentifier.setName(getValidIdentifier(tmpData[0], yangConstruct, ctx));
+            return nodeIdentifier;
+        } else if (tmpData.length == 2) {
+            YangNodeIdentifier nodeIdentifier = new YangNodeIdentifier();
+            nodeIdentifier.setPrefix(getValidIdentifier(tmpData[0], yangConstruct, ctx));
+            nodeIdentifier.setName(getValidIdentifier(tmpData[1], yangConstruct, ctx));
+            return nodeIdentifier;
+        } else {
+            ParserException parserException = new ParserException("YANG file error : " +
+                    YangConstructType.getYangConstructType(yangConstruct) + " name " + nodeIdentifierString +
+                    " is not valid.");
+            parserException.setLine(ctx.getStart().getLine());
+            parserException.setCharPosition(ctx.getStart().getCharPositionInLine());
+            throw parserException;
+        }
+    }
+
+    /**
+     * Checks whether the type is an unsupported type.
+     *
+     * @param typeName name of the type
+     * @param yangConstruct yang construct to check if it is type
+     * @param ctx yang construct's context to get the line number and character position
+     */
+    private static void checkForUnsupportedTypes(String typeName,
+            YangConstructType yangConstruct, ParserRuleContext ctx) {
+
+        if (yangConstruct == YangConstructType.TYPE_DATA) {
+            if (typeName.equalsIgnoreCase(LEAFREF)) {
+                handleUnsupportedYangConstruct(YangConstructType.LEAFREF_DATA,
+                        ctx, CURRENTLY_UNSUPPORTED);
+            } else if (typeName.equalsIgnoreCase(IDENTITYREF)) {
+                handleUnsupportedYangConstruct(YangConstructType.IDENTITYREF_DATA,
+                        ctx, CURRENTLY_UNSUPPORTED);
+            } else if (typeName.equalsIgnoreCase(INSTANCE_IDENTIFIER)) {
+                handleUnsupportedYangConstruct(YangConstructType.INSTANCE_IDENTIFIER_DATA,
+                        ctx, CURRENTLY_UNSUPPORTED);
+            }
+        }
+    }
+
+    /**
+     * Checks and return valid absolute schema node id.
+     *
+     * @param argumentString string from yang file
+     * @param yangConstructType yang construct for creating error message
+     * @param ctx yang construct's context to get the line number and character position
+     * @return target nodes list of absolute schema node id
+     */
+    public static List<YangNodeIdentifier> getValidAbsoluteSchemaNodeId(String argumentString,
+            YangConstructType yangConstructType, ParserRuleContext ctx) {
+
+        List<YangNodeIdentifier> targetNodes = new LinkedList<>();
+        YangNodeIdentifier yangNodeIdentifier;
+        String tmpSchemaNodeId = removeQuotesAndHandleConcat(argumentString);
+
+        // absolute-schema-nodeid = 1*("/" node-identifier)
+        if (!tmpSchemaNodeId.startsWith(SLASH)) {
+            ParserException parserException = new ParserException("YANG file error : " +
+                    YangConstructType.getYangConstructType(yangConstructType) + " name " + argumentString +
+                    "is not valid");
+            parserException.setLine(ctx.getStart().getLine());
+            parserException.setCharPosition(ctx.getStart().getCharPositionInLine());
+            throw parserException;
+        }
+        String[] tmpData = tmpSchemaNodeId.replaceFirst(CARET + SLASH, EMPTY_STRING).split(SLASH);
+        for (String nodeIdentifiers : tmpData) {
+            yangNodeIdentifier = getValidNodeIdentifier(nodeIdentifiers, yangConstructType, ctx);
+            targetNodes.add(yangNodeIdentifier);
+        }
+        return targetNodes;
+    }
+
+    /**
+     * Throws parser exception for unsupported YANG constructs.
+     *
+     * @param yangConstructType yang construct for creating error message
+     * @param ctx yang construct's context to get the line number and character position
+     * @param errorInfo error information
+     */
+    public static void handleUnsupportedYangConstruct(YangConstructType yangConstructType,
+        ParserRuleContext ctx, String errorInfo) {
+        ParserException parserException = new ParserException(YANG_FILE_ERROR
+                + QUOTES + YangConstructType.getYangConstructType(yangConstructType) + QUOTES
+                + errorInfo);
+        parserException.setLine(ctx.getStart().getLine());
+        parserException.setCharPosition(ctx.getStart().getCharPositionInLine());
+        throw parserException;
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/parserutils/ListenerValidation.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/parserutils/ListenerValidation.java
new file mode 100644
index 0000000..f5e98d0
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/parserutils/ListenerValidation.java
@@ -0,0 +1,237 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.parserutils;
+
+import java.util.Iterator;
+import java.util.List;
+
+import org.antlr.v4.runtime.ParserRuleContext;
+import org.onosproject.yangutils.datamodel.YangContainer;
+import org.onosproject.yangutils.datamodel.YangList;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.utils.Parsable;
+import org.onosproject.yangutils.datamodel.utils.YangConstructType;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.TreeWalkListener;
+
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.getYangConstructType;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructListenerErrorMessage;
+
+/**
+ * Represents a utility to carry out listener validation.
+ */
+public final class ListenerValidation {
+
+    /**
+     * Creates a new listener validation.
+     */
+    private ListenerValidation() {
+    }
+
+    /**
+     * Checks parsed data stack is not empty.
+     *
+     * @param listener Listener's object
+     * @param errorType error type needs to be set in error message
+     * @param yangConstructType type of parsable data in which error occurred
+     * @param parsableDataTypeName name of parsable data type in which error
+     *            occurred
+     * @param errorLocation location where error occurred
+     */
+    public static void checkStackIsNotEmpty(TreeWalkListener listener, ListenerErrorType errorType,
+            YangConstructType yangConstructType, String parsableDataTypeName,
+            ListenerErrorLocation errorLocation) {
+
+        if (listener.getParsedDataStack().empty()) {
+            /*
+             * If stack is empty it indicates error condition, value of
+             * parsableDataTypeName will be null in case there is no name
+             * attached to parsable data type.
+             */
+            String message = constructListenerErrorMessage(errorType, yangConstructType, parsableDataTypeName,
+                    errorLocation);
+            throw new ParserException(message);
+        }
+    }
+
+    /**
+     * Checks parsed data stack is empty.
+     *
+     * @param listener Listener's object
+     * @param errorType error type needs to be set in error message
+     * @param yangConstructType type of parsable data in which error occurred
+     * @param parsableDataTypeName name of parsable data type in which error
+     *            occurred
+     * @param errorLocation location where error occurred
+     */
+    public static void checkStackIsEmpty(TreeWalkListener listener, ListenerErrorType errorType,
+            YangConstructType yangConstructType, String parsableDataTypeName,
+            ListenerErrorLocation errorLocation) {
+
+        if (!listener.getParsedDataStack().empty()) {
+            /*
+             * If stack is empty it indicates error condition, value of
+             * parsableDataTypeName will be null in case there is no name
+             * attached to parsable data type.
+             */
+            String message = constructListenerErrorMessage(errorType, yangConstructType, parsableDataTypeName,
+                    errorLocation);
+            throw new ParserException(message);
+        }
+    }
+
+    /**
+     * Returns parent node config value, if top node does not specify a config
+     * statement then default value true is returned.
+     *
+     * @param listener listener's object
+     * @return true/false parent's config value
+     */
+    public static boolean getParentNodeConfig(TreeWalkListener listener) {
+
+        YangNode parentNode;
+        Parsable curData = listener.getParsedDataStack().peek();
+        if (curData instanceof YangNode) {
+            parentNode = ((YangNode) curData).getParent();
+            if (parentNode instanceof YangContainer) {
+                return ((YangContainer) parentNode).isConfig();
+            } else if (parentNode instanceof YangList) {
+                return ((YangList) parentNode).isConfig();
+            }
+        }
+        return true;
+    }
+
+    /**
+     * Checks if a rule occurrences is as per the expected YANG grammar's
+     * cardinality.
+     *
+     * @param childContext child's context
+     * @param yangChildConstruct child construct for whom cardinality is to be
+     *            validated
+     * @param yangParentConstruct parent construct
+     * @param parentName parent name
+     * @throws ParserException exception if cardinality check fails
+     */
+    public static void validateCardinalityMaxOne(List<?> childContext, YangConstructType yangChildConstruct,
+            YangConstructType yangParentConstruct, String parentName)
+            throws ParserException {
+
+        if (!childContext.isEmpty() && childContext.size() != 1) {
+            ParserException parserException = new ParserException("YANG file error: \""
+                    + getYangConstructType(yangChildConstruct) + "\" is defined more than once in \""
+                    + getYangConstructType(yangParentConstruct) + " " + parentName + "\".");
+
+            Iterator<?> context = childContext.iterator();
+            parserException.setLine(((ParserRuleContext) context.next()).getStart().getLine());
+            parserException.setCharPosition(((ParserRuleContext) context.next()).getStart().getCharPositionInLine());
+            throw parserException;
+        }
+    }
+
+    /**
+     * Checks if a rule occurrences is exactly 1.
+     *
+     * @param childContext child's context
+     * @param yangChildConstruct child construct for whom cardinality is to be
+     *                           validated
+     * @param yangParentConstruct parent construct
+     * @param parentName parent name
+     * @param parentContext parents's context
+     * @throws ParserException exception if cardinality check fails
+     */
+    public static void validateCardinalityEqualsOne(List<?> childContext, YangConstructType yangChildConstruct,
+            YangConstructType yangParentConstruct, String parentName,
+            ParserRuleContext parentContext)
+            throws ParserException {
+
+        if (childContext.isEmpty()) {
+            ParserException parserException = new ParserException("YANG file error: Missing \""
+                    + getYangConstructType(yangChildConstruct) + "\" in \"" + getYangConstructType(yangParentConstruct)
+                    + " " + parentName + "\".");
+            parserException.setLine(parentContext.getStart().getLine());
+            parserException.setCharPosition(parentContext.getStart().getCharPositionInLine());
+            throw parserException;
+        } else if (!childContext.isEmpty() && childContext.size() != 1) {
+            Iterator<?> childcontext = childContext.iterator();
+            ParserException parserException = new ParserException("YANG file error: \""
+                    + getYangConstructType(yangChildConstruct) + "\" is present more than once in \""
+                    + getYangConstructType(yangParentConstruct) + " " + parentName + "\".");
+            parserException.setLine(((ParserRuleContext) childcontext.next()).getStart().getLine());
+            parserException.setCharPosition(((ParserRuleContext) childcontext.next()).getStart()
+                    .getCharPositionInLine());
+            throw parserException;
+        }
+    }
+
+    /**
+     * Checks if a rule occurrences is minimum 1.
+     *
+     * @param childContext child's context
+     * @param yangChildConstruct child construct for whom cardinality is to be
+     *                           validated
+     * @param yangParentConstruct parent construct
+     * @param parentName parent name
+     * @param parentContext parents's context
+     * @throws ParserException exception if cardinality check fails
+     */
+    public static void validateCardinalityNonZero(List<?> childContext, YangConstructType yangChildConstruct,
+            YangConstructType yangParentConstruct, String parentName,
+            ParserRuleContext parentContext)
+            throws ParserException {
+
+        if (childContext.isEmpty()) {
+            ParserException parserException = new ParserException("YANG file error: Missing \""
+                    + getYangConstructType(yangChildConstruct) + "\" in \"" + getYangConstructType(yangParentConstruct)
+                    + " " + parentName + "\".");
+
+            parserException.setLine(parentContext.getStart().getLine());
+            parserException.setCharPosition(parentContext.getStart().getCharPositionInLine());
+            throw parserException;
+        }
+    }
+
+    /**
+     * Checks if a either of one construct occurrence.
+     *
+     * @param child1Context first optional child's context
+     * @param yangChild1Construct first child construct for whom cardinality is
+     *                            to be validated
+     * @param child2Context second optional child's context
+     * @param yangChild2Construct second child construct for whom cardinality is
+     *                            to be validated
+     * @param yangParentConstruct parent construct
+     * @param parentName parent name
+     * @throws ParserException exception if cardinality check fails
+     */
+    public static void validateMutuallyExclusiveChilds(List<?> child1Context, YangConstructType yangChild1Construct,
+            List<?> child2Context, YangConstructType yangChild2Construct,
+            YangConstructType yangParentConstruct, String parentName)
+            throws ParserException {
+
+        if (!child1Context.isEmpty() && !child2Context.isEmpty()) {
+            ParserException parserException = new ParserException("YANG file error: \""
+                    + getYangConstructType(yangChild1Construct) + "\" & \"" + getYangConstructType(yangChild2Construct)
+                    + "\" should be mutually exclusive in \"" + getYangConstructType(yangParentConstruct) + " "
+                    + parentName + "\".");
+
+            parserException.setLine(((ParserRuleContext) child2Context).getStart().getLine());
+            parserException.setCharPosition(((ParserRuleContext) child2Context).getStart().getCharPositionInLine());
+            throw parserException;
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/parserutils/ParseTreeErrorListener.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/parserutils/ParseTreeErrorListener.java
new file mode 100644
index 0000000..af81d6f
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/parserutils/ParseTreeErrorListener.java
@@ -0,0 +1,41 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.parserutils;
+
+import org.antlr.v4.runtime.BaseErrorListener;
+import org.antlr.v4.runtime.RecognitionException;
+import org.antlr.v4.runtime.Recognizer;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+
+/**
+ * Represent the parse tree error listener.
+ * By default, ANTLR sends all errors to standard error, this is changed by
+ * providing this new implementation of interface ANTLRErrorListener. The
+ * interface has a syntaxError() method that applies to both lexer and parser.
+ */
+public class ParseTreeErrorListener extends BaseErrorListener {
+
+    @Override
+    public void syntaxError(Recognizer<?, ?> recognizer, Object offendingSymbol, int line, int charPositionInLine,
+            String msg, RecognitionException e) {
+
+        ParserException parserException = new ParserException(msg);
+        parserException.setLine(line);
+        parserException.setCharPosition(charPositionInLine);
+        throw parserException;
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/parserutils/package-info.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/parserutils/package-info.java
new file mode 100644
index 0000000..9eafb00
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/impl/parserutils/package-info.java
@@ -0,0 +1,20 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Provide common utils for parser implementation.
+ */
+package org.onosproject.yangutils.parser.impl.parserutils;
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/package-info.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/package-info.java
new file mode 100644
index 0000000..f039e68
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/parser/package-info.java
@@ -0,0 +1,20 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+/**
+ * Interfaces to process YANG information from ANTLR generated listeners.
+ */
+package org.onosproject.yangutils.parser;
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/plugin/manager/YangFileInfo.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/plugin/manager/YangFileInfo.java
new file mode 100644
index 0000000..6c16aa2
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/plugin/manager/YangFileInfo.java
@@ -0,0 +1,184 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.plugin.manager;
+
+import java.util.Objects;
+
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.utils.ResolvableStatus;
+
+/**
+ * Represents YANG file information.
+ */
+public class YangFileInfo {
+
+    /**
+     * YANG file name.
+     */
+    private String yangFileName;
+
+    /**
+     * YANG file revision.
+     */
+    private String revision;
+
+    /**
+     * Data model node after parsing YANG file.
+     */
+    private YangNode rootNode;
+
+    /**
+     * Resolution status of YANG file.
+     */
+    private ResolvableStatus resolvableStatus;
+
+    /**
+     * Location for serialized files in case of inter-jar dependencies.
+     */
+    private String serializedFile;
+
+    /**
+     * Flag to know if the root node require to be translated.
+     */
+    private boolean isForTranslator = true;
+
+    /**
+     * Returns data model node for YANG file.
+     *
+     * @return data model node for YANG file
+     */
+    public YangNode getRootNode() {
+        return rootNode;
+    }
+
+    /**
+     * Sets data model node for YANG file.
+     *
+     * @param rootNode of the Yang file
+     */
+    public void setRootNode(YangNode rootNode) {
+        this.rootNode = rootNode;
+    }
+
+    /**
+     * Returns YANG file name.
+     *
+     * @return yangFileName YANG file name
+     */
+    public String getYangFileName() {
+        return yangFileName;
+    }
+
+    /**
+     * Sets YANG file name.
+     *
+     * @param yangFileName YANG file name
+     */
+    public void setYangFileName(String yangFileName) {
+        this.yangFileName = yangFileName;
+    }
+
+    /**
+     * Returns the revision of YANG file.
+     *
+     * @return revision of YANG file
+     */
+    public String getRevision() {
+        return revision;
+    }
+
+    /**
+     * Sets the revision of YANG file.
+     *
+     * @param revision revision of YANG file
+     */
+    public void setRevision(String revision) {
+        this.revision = revision;
+    }
+
+    /**
+     * Returns the resolution status of YANG file.
+     *
+     * @return resolution status of YANG file
+     */
+    public ResolvableStatus getResolvableStatus() {
+        return resolvableStatus;
+    }
+
+    /**
+     * Sets the resolution status of YANG file.
+     *
+     * @param resolvableStatus resolution status of YANG file
+     */
+    public void setResolvableStatus(ResolvableStatus resolvableStatus) {
+        this.resolvableStatus = resolvableStatus;
+    }
+
+    /**
+     * Returns serialized file of datamodel.
+     *
+     * @return the serialized file of datamodel
+     */
+    public String getSerializedFile() {
+        return serializedFile;
+    }
+
+    /**
+     * Sets serialized file of datamodel.
+     *
+     * @param serializedFile serialized file of datamodel
+     */
+    public void setSerializedFile(String serializedFile) {
+        this.serializedFile = serializedFile;
+    }
+
+    /**
+     * Returns true if node need to be translated.
+     *
+     * @return isForTranslator true if node need to be translated
+     */
+    public boolean isForTranslator() {
+        return isForTranslator;
+    }
+
+    /**
+     * Sets true if node need to be translated.
+     *
+     * @param isForTranslator true if node need to be translated
+     */
+    public void setForTranslator(boolean isForTranslator) {
+        this.isForTranslator = isForTranslator;
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+
+        if (this == obj) {
+            return true;
+        }
+        if (obj instanceof YangFileInfo) {
+            final YangFileInfo other = (YangFileInfo) obj;
+            return Objects.equals(yangFileName, other.yangFileName);
+        }
+        return false;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hashCode(yangFileName);
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/plugin/manager/YangUtilManager.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/plugin/manager/YangUtilManager.java
new file mode 100644
index 0000000..9339e4b
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/plugin/manager/YangUtilManager.java
@@ -0,0 +1,374 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.plugin.manager;
+
+import java.io.IOException;
+import java.util.HashSet;
+import java.util.Iterator;
+import java.util.List;
+import java.util.Set;
+
+import org.apache.maven.artifact.repository.ArtifactRepository;
+import org.apache.maven.plugin.AbstractMojo;
+import org.apache.maven.plugin.MojoExecutionException;
+import org.apache.maven.plugin.MojoFailureException;
+import org.apache.maven.plugins.annotations.Component;
+import org.apache.maven.plugins.annotations.Mojo;
+import org.apache.maven.plugins.annotations.Parameter;
+import org.apache.maven.project.MavenProject;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.linker.YangLinker;
+import org.onosproject.yangutils.linker.exceptions.LinkerException;
+import org.onosproject.yangutils.linker.impl.YangLinkerManager;
+import org.onosproject.yangutils.parser.YangUtilsParser;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
+import org.onosproject.yangutils.translator.tojava.utils.YangPluginConfig;
+import org.onosproject.yangutils.translator.tojava.utils.YangToJavaNamingConflictUtil;
+import org.onosproject.yangutils.utils.io.impl.YangFileScanner;
+import org.sonatype.plexus.build.incremental.BuildContext;
+
+import static org.apache.maven.plugins.annotations.LifecyclePhase.GENERATE_SOURCES;
+import static org.apache.maven.plugins.annotations.ResolutionScope.COMPILE;
+import static org.onosproject.yangutils.translator.tojava.JavaCodeGeneratorUtil.generateJavaCode;
+import static org.onosproject.yangutils.translator.tojava.JavaCodeGeneratorUtil.translatorErrorHandler;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaIdentifierSyntax.getPackageDirPathFromJavaJPackage;
+import static org.onosproject.yangutils.utils.UtilConstants.DEFAULT_BASE_PKG;
+import static org.onosproject.yangutils.utils.UtilConstants.NEW_LINE;
+import static org.onosproject.yangutils.utils.UtilConstants.SLASH;
+import static org.onosproject.yangutils.utils.io.impl.YangIoUtils.addToCompilationRoot;
+import static org.onosproject.yangutils.utils.io.impl.YangIoUtils.copyYangFilesToTarget;
+import static org.onosproject.yangutils.utils.io.impl.YangIoUtils.deleteDirectory;
+import static org.onosproject.yangutils.utils.io.impl.YangIoUtils.getDirectory;
+import static org.onosproject.yangutils.utils.io.impl.YangIoUtils.resolveInterJarDependencies;
+import static org.onosproject.yangutils.utils.io.impl.YangIoUtils.serializeDataModel;
+
+/**
+ * Represents ONOS YANG utility maven plugin.
+ * Goal of plugin is yang2java.
+ * Execution phase is generate-sources.
+ * requiresDependencyResolution at compile time.
+ */
+@Mojo(name = "yang2java", defaultPhase = GENERATE_SOURCES, requiresDependencyResolution = COMPILE,
+    requiresProject = true)
+public class YangUtilManager
+        extends AbstractMojo {
+
+    private YangNode rootNode;
+    // YANG file information set.
+    private Set<YangFileInfo> yangFileInfoSet = new HashSet<>();
+    private YangUtilsParser yangUtilsParser = new YangUtilsParserManager();
+    private YangLinker yangLinker = new YangLinkerManager();
+    private YangFileInfo curYangFileInfo = new YangFileInfo();
+
+    private static final String DEFAULT_PKG = SLASH + getPackageDirPathFromJavaJPackage(DEFAULT_BASE_PKG);
+
+    /**
+     * Source directory for YANG files.
+     */
+    @Parameter(property = "yangFilesDir", defaultValue = "src/main/yang")
+    private String yangFilesDir;
+
+    /**
+     * Source directory for generated files.
+     */
+    @Parameter(property = "genFilesDir", defaultValue = "src/main/java")
+    private String genFilesDir;
+
+    /**
+     * Base directory for project.
+     */
+    @Parameter(property = "basedir", defaultValue = "${basedir}")
+    private String baseDir;
+
+    /**
+     * Output directory.
+     */
+    @Parameter(property = "project.build.outputDirectory", required = true, defaultValue = "target/classes")
+    private String outputDirectory;
+
+    /**
+     * Current maven project.
+     */
+    @Parameter(property = "project", required = true, readonly = true, defaultValue = "${project}")
+    private MavenProject project;
+
+    /**
+     * Replacement required for period special character in the identifier.
+     */
+    @Parameter(property = "replacementForPeriod")
+    private String replacementForPeriod;
+
+    /**
+     * Replacement required for underscore special character in the identifier.
+     */
+    @Parameter(property = "replacementForUnderscore")
+    private String replacementForUnderscore;
+
+    /**
+     * Replacement required for hyphen special character in the identifier.
+     */
+    @Parameter(property = "replacementForHyphen")
+    private String replacementForHyphen;
+
+    /**
+     * Prefix which is required for adding with the identifier.
+     */
+    @Parameter(property = "prefixForIdentifier")
+    private String prefixForIdentifier;
+
+    /**
+     * Build context.
+     */
+    @Component
+    private BuildContext context;
+
+    @Parameter(readonly = true, defaultValue = "${localRepository}")
+    private ArtifactRepository localRepository;
+
+    @Parameter(readonly = true, defaultValue = "${project.remoteArtifactRepositories}")
+    private List<ArtifactRepository> remoteRepository;
+
+    @Override
+    public void execute()
+            throws MojoExecutionException, MojoFailureException {
+
+        try {
+
+            /*
+             * For deleting the generated code in previous build.
+             */
+            deleteDirectory(getDirectory(baseDir, genFilesDir) + DEFAULT_PKG);
+            deleteDirectory(getDirectory(baseDir, outputDirectory));
+
+            String searchDir = getDirectory(baseDir, yangFilesDir);
+            String codeGenDir = getDirectory(baseDir, genFilesDir) + SLASH;
+
+            // Creates conflict resolver and set values to it.
+            YangToJavaNamingConflictUtil conflictResolver = new YangToJavaNamingConflictUtil();
+            conflictResolver.setReplacementForPeriod(replacementForPeriod);
+            conflictResolver.setReplacementForHyphen(replacementForHyphen);
+            conflictResolver.setReplacementForUnderscore(replacementForUnderscore);
+            conflictResolver.setPrefixForIdentifier(prefixForIdentifier);
+            YangPluginConfig yangPlugin = new YangPluginConfig();
+            yangPlugin.setCodeGenDir(codeGenDir);
+            yangPlugin.setConflictResolver(conflictResolver);
+
+            /*
+             * Obtain the YANG files at a path mentioned in plugin and creates
+             * YANG file information set.
+             */
+            createYangFileInfoSet(YangFileScanner.getYangFiles(searchDir));
+
+            // Check if there are any file to translate, if not return.
+            if (getYangFileInfoSet() == null || getYangFileInfoSet().isEmpty()) {
+                // No files to translate
+                return;
+            }
+            // Resolve inter jar dependency.
+            resolveInterJardependency();
+
+            // Carry out the parsing for all the YANG files.
+            parseYangFileInfoSet();
+
+            // Resolve dependencies using linker.
+            resolveDependenciesUsingLinker();
+
+            // Perform translation to JAVA.
+            translateToJava(getYangFileInfoSet(), yangPlugin);
+
+            // Serialize data model.
+            serializeDataModel(getDirectory(baseDir, outputDirectory), getYangFileInfoSet(), project, true);
+
+            addToCompilationRoot(getDirectory(baseDir, genFilesDir), project, context);
+
+            copyYangFilesToTarget(getYangFileInfoSet(), getDirectory(baseDir, outputDirectory), project);
+        } catch (IOException | ParserException e) {
+            getLog().info(e);
+            String fileName = "";
+            if (getCurYangFileInfo() != null) {
+                fileName = getCurYangFileInfo().getYangFileName();
+            }
+            try {
+                translatorErrorHandler(getRootNode());
+                deleteDirectory(getDirectory(baseDir, genFilesDir) + DEFAULT_PKG);
+            } catch (IOException ex) {
+                throw new MojoExecutionException(
+                        "Error handler failed to delete files for data model node.");
+            }
+            throw new MojoExecutionException(
+                    "Exception occured due to " + e.getLocalizedMessage() + " in " + fileName
+                            + " YANG file.");
+        }
+    }
+
+    /**
+     * Resolved inter-jar dependencies.
+     *
+     * @throws IOException when fails to do IO operations
+     */
+    public void resolveInterJardependency() throws IOException {
+        try {
+            List<YangNode> interJarResolvedNodes = resolveInterJarDependencies(project, localRepository,
+                    remoteRepository, getDirectory(baseDir, outputDirectory));
+            for (YangNode node : interJarResolvedNodes) {
+                YangFileInfo dependentFileInfo = new YangFileInfo();
+                dependentFileInfo.setRootNode(node);
+                dependentFileInfo.setForTranslator(false);
+                dependentFileInfo.setYangFileName(node.getName());
+                getYangFileInfoSet().add(dependentFileInfo);
+            }
+        } catch (IOException e) {
+            throw new IOException("failed to resolve in interjar scenario.");
+        }
+    }
+
+    /**
+     * Links all the provided with the YANG file info set.
+     *
+     * @throws MojoExecutionException a violation in mojo excecution
+     */
+    public void resolveDependenciesUsingLinker()
+            throws MojoExecutionException {
+        for (YangFileInfo yangFileInfo : getYangFileInfoSet()) {
+            setCurYangFileInfo(yangFileInfo);
+            try {
+                yangLinker.resolveDependencies(getYangFileInfoSet());
+            } catch (LinkerException e) {
+                throw new MojoExecutionException(e.getMessage());
+            }
+        }
+    }
+
+    /**
+     * Parses all the provided YANG files and generates YANG data model tree.
+     *
+     * @throws IOException a violation in IO
+     */
+    public void parseYangFileInfoSet()
+            throws IOException {
+        for (YangFileInfo yangFileInfo : getYangFileInfoSet()) {
+            setCurYangFileInfo(yangFileInfo);
+            if (yangFileInfo.isForTranslator()) {
+                try {
+                    YangNode yangNode = yangUtilsParser.getDataModel(yangFileInfo.getYangFileName());
+                    yangFileInfo.setRootNode(yangNode);
+                    setRootNode(yangNode);
+                } catch (ParserException e) {
+                    String logInfo = "Error in file: " + e.getFileName();
+                    if (e.getLineNumber() != 0) {
+                        logInfo = logInfo + " at line: " + e.getLineNumber() + " at position: "
+                                + e.getCharPositionInLine();
+
+                    }
+                    if (e.getMessage() != null) {
+                        logInfo = logInfo + NEW_LINE + e.getMessage();
+                    }
+                    getLog().info(logInfo);
+                    throw e;
+                }
+            }
+        }
+    }
+
+    /**
+     * Returns current root YANG node of data-model tree.
+     *
+     * @return current root YANG node of data-model tree
+     */
+    private YangNode getRootNode() {
+        return rootNode;
+    }
+
+    /**
+     * Sets current root YANG node of data-model tree.
+     *
+     * @param rootNode current root YANG node of data-model tree
+     */
+    private void setRootNode(YangNode rootNode) {
+        this.rootNode = rootNode;
+    }
+
+    /**
+     * Translates to java code corresponding to the YANG schema.
+     *
+     * @param yangFileInfoSet YANG file information
+     * @param yangPlugin      YANG plugin config
+     * @throws IOException when fails to generate java code file the current
+     *                     node
+     */
+    public void translateToJava(Set<YangFileInfo> yangFileInfoSet, YangPluginConfig yangPlugin)
+            throws IOException {
+        Iterator<YangFileInfo> yangFileIterator = yangFileInfoSet.iterator();
+        while (yangFileIterator.hasNext()) {
+            YangFileInfo yangFileInfo = yangFileIterator.next();
+            setCurYangFileInfo(yangFileInfo);
+            if (yangFileInfo.isForTranslator()) {
+                generateJavaCode(yangFileInfo.getRootNode(), yangPlugin);
+            }
+        }
+    }
+
+    /**
+     * Creates a YANG file info set.
+     *
+     * @param yangFileList YANG files list
+     */
+    public void createYangFileInfoSet(List<String> yangFileList) {
+        for (String yangFile : yangFileList) {
+            YangFileInfo yangFileInfo = new YangFileInfo();
+            yangFileInfo.setYangFileName(yangFile);
+            getYangFileInfoSet().add(yangFileInfo);
+        }
+    }
+
+    /**
+     * Returns the YANG file info set.
+     *
+     * @return the YANG file info set
+     */
+    public Set<YangFileInfo> getYangFileInfoSet() {
+        return yangFileInfoSet;
+    }
+
+    /**
+     * Sets the YANG file info set.
+     *
+     * @param yangFileInfoSet the YANG file info set
+     */
+    public void setYangFileInfoSet(Set<YangFileInfo> yangFileInfoSet) {
+        this.yangFileInfoSet = yangFileInfoSet;
+    }
+
+    /**
+     * Returns current YANG file's info.
+     *
+     * @return the yangFileInfo
+     */
+    public YangFileInfo getCurYangFileInfo() {
+        return curYangFileInfo;
+    }
+
+    /**
+     * Sets current YANG file's info.
+     *
+     * @param yangFileInfo the yangFileInfo to set
+     */
+    public void setCurYangFileInfo(YangFileInfo yangFileInfo) {
+        curYangFileInfo = yangFileInfo;
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/plugin/manager/package-info.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/plugin/manager/package-info.java
new file mode 100644
index 0000000..745e91c
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/plugin/manager/package-info.java
@@ -0,0 +1,20 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * YANG utility maven plugin.
+ */
+package org.onosproject.yangutils.plugin.manager;
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/exception/TranslatorException.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/exception/TranslatorException.java
new file mode 100644
index 0000000..cf2c07d
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/exception/TranslatorException.java
@@ -0,0 +1,79 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.translator.exception;
+
+/**
+ * Represents custom translator exception for translator's operations.
+ */
+public class TranslatorException extends RuntimeException {
+
+    private static final long serialVersionUID = 20160311L;
+    private String fileName;
+
+    /**
+     * Create a new translator exception.
+     */
+    public TranslatorException() {
+        super();
+    }
+
+    /**
+     * Creates a new translator exception with given message.
+     *
+     * @param message the detail of exception in string
+     */
+    public TranslatorException(String message) {
+        super(message);
+    }
+
+    /**
+     * Creates a new translator exception from given message and cause.
+     *
+     * @param message the detail of exception in string
+     * @param cause underlying cause of the error
+     */
+    public TranslatorException(final String message, final Throwable cause) {
+        super(message, cause);
+    }
+
+    /**
+     * Creates a new translator exception from cause.
+     *
+     * @param cause underlying cause of the error
+     */
+    public TranslatorException(final Throwable cause) {
+        super(cause);
+    }
+
+    /**
+     * Returns generated file name for the exception.
+     *
+     * @return generated file name for the exception
+     */
+    public String getFileName() {
+        return this.fileName;
+    }
+
+    /**
+     * Sets file name in translator exception.
+     *
+     * @param fileName generated file name
+     */
+    public void setFileName(String fileName) {
+        this.fileName = fileName;
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/exception/package-info.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/exception/package-info.java
new file mode 100644
index 0000000..b88a8a3
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/exception/package-info.java
@@ -0,0 +1,20 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Custom exception for translator.
+ */
+package org.onosproject.yangutils.translator.exception;
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/package-info.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/package-info.java
new file mode 100644
index 0000000..72ba2e4
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/package-info.java
@@ -0,0 +1,20 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Translator to generate class definition corresponding to YANG definition.
+ */
+package org.onosproject.yangutils.translator;
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/GeneratedJavaFileType.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/GeneratedJavaFileType.java
new file mode 100644
index 0000000..d4666c0c
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/GeneratedJavaFileType.java
@@ -0,0 +1,96 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.translator.tojava;
+
+/**
+ * Represents type of java files generated.
+ */
+public final class GeneratedJavaFileType {
+
+    /**
+     * Interface file.
+     */
+    public static final int INTERFACE_MASK = 1;
+
+    /**
+     * Builder interface file.
+     */
+    public static final int BUILDER_INTERFACE_MASK = 2;
+
+    /**
+     * Builder class file.
+     */
+    public static final int BUILDER_CLASS_MASK = 4;
+
+    /**
+     * Impl class file.
+     */
+    public static final int IMPL_CLASS_MASK = 8;
+
+    /**
+     * Interface and class file.
+     */
+    public static final int GENERATE_INTERFACE_WITH_BUILDER = INTERFACE_MASK
+            | BUILDER_INTERFACE_MASK | BUILDER_CLASS_MASK | IMPL_CLASS_MASK;
+
+    /**
+     * Java interface corresponding to rpc.
+     */
+    public static final int GENERATE_SERVICE_AND_MANAGER = 16;
+
+    /**
+     * Java class corresponding to YANG enumeration.
+     */
+    public static final int GENERATE_ENUM_CLASS = 32;
+
+    /**
+     * Java class corresponding to typedef.
+     */
+    public static final int GENERATE_TYPEDEF_CLASS = 64;
+
+    /**
+     * Java class corresponding to union.
+     */
+    public static final int GENERATE_UNION_CLASS = 128;
+
+    /**
+     * Java class corresponding to typedef.
+     */
+    public static final int GENERATE_TYPE_CLASS = GENERATE_TYPEDEF_CLASS
+            | GENERATE_UNION_CLASS;
+
+    /**
+     * Event class.
+     */
+    public static final int GENERATE_EVENT_CLASS = 256;
+
+    /**
+     * Event listener class.
+     */
+    public static final int GENERATE_EVENT_LISTENER_INTERFACE = 512;
+
+    /**
+     * Event listener class.
+     */
+    public static final int GENERATE_EVENT_SUBJECT_CLASS = 1024;
+
+    /**
+     * Creates an instance of generate java file type.
+     */
+    private GeneratedJavaFileType() {
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/GeneratedTempFileType.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/GeneratedTempFileType.java
new file mode 100644
index 0000000..2ffd282
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/GeneratedTempFileType.java
@@ -0,0 +1,129 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.translator.tojava;
+
+/**
+ * Represents type of temporary files generated.
+ */
+public final class GeneratedTempFileType {
+
+    /**
+     * Attributes definition temporary file.
+     */
+    public static final int ATTRIBUTES_MASK = 1;
+
+    /**
+     * Getter methods for interface.
+     */
+    public static final int GETTER_FOR_INTERFACE_MASK = 2;
+
+    /**
+     * Getter methods for class.
+     */
+    public static final int GETTER_FOR_CLASS_MASK = 4;
+
+    /**
+     * Setter methods for interface.
+     */
+    public static final int SETTER_FOR_INTERFACE_MASK = 8;
+
+    /**
+     * Setter methods for class.
+     */
+    public static final int SETTER_FOR_CLASS_MASK = 16;
+
+    /**
+     * Constructor method of class.
+     */
+    public static final int CONSTRUCTOR_IMPL_MASK = 32;
+
+    /**
+     * Hash code implementation of class.
+     */
+    public static final int HASH_CODE_IMPL_MASK = 64;
+
+    /**
+     * Equals implementation of class.
+     */
+    public static final int EQUALS_IMPL_MASK = 128;
+
+    /**
+     * To string implementation of class.
+     */
+    public static final int TO_STRING_IMPL_MASK = 256;
+
+    /**
+     * Of string implementation of class.
+     */
+    public static final int OF_STRING_IMPL_MASK = 512;
+
+    /**
+     * Constructor for type class like typedef, union.
+     */
+    public static final int CONSTRUCTOR_FOR_TYPE_MASK = 1024;
+
+    /**
+     * From string implementation of class.
+     */
+    public static final int FROM_STRING_IMPL_MASK = 2048;
+
+    /**
+     * Enum implementation of class.
+     */
+    public static final int ENUM_IMPL_MASK = 4096;
+
+    /**
+     * Rpc interface of module / sub module.
+     */
+    public static final int RPC_INTERFACE_MASK = 8192;
+
+    /**
+     * Rpc implementation of module / sub module.
+     */
+    public static final int RPC_IMPL_MASK = 16384;
+
+    /**
+     * Event enum implementation of class.
+     */
+    public static final int EVENT_ENUM_MASK = 32768;
+
+    /**
+     * Event method implementation of class.
+     */
+    public static final int EVENT_METHOD_MASK = 65536;
+
+    /**
+     * Event subject attribute implementation of class.
+     */
+    public static final int EVENT_SUBJECT_ATTRIBUTE_MASK = 131072;
+
+    /**
+     * Event subject getter implementation of class.
+     */
+    public static final int EVENT_SUBJECT_GETTER_MASK = 262144;
+
+    /**
+     * Event subject setter implementation of class.
+     */
+    public static final int EVENT_SUBJECT_SETTER_MASK = 524288;
+
+    /**
+     * Creates an instance of generated temp file type.
+     */
+    private GeneratedTempFileType() {
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/JavaAttributeInfo.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/JavaAttributeInfo.java
new file mode 100644
index 0000000..485878b
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/JavaAttributeInfo.java
@@ -0,0 +1,200 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.translator.tojava;
+
+import org.onosproject.yangutils.datamodel.YangType;
+import org.onosproject.yangutils.translator.exception.TranslatorException;
+
+/**
+ * Represents the attribute info corresponding to class/interface generated.
+ */
+public final class JavaAttributeInfo {
+
+    /**
+     * The data type info of attribute.
+     */
+    private YangType<?> attrType;
+
+    /**
+     * Name of the attribute.
+     */
+    private String name;
+
+    /**
+     * If the added attribute is a list of info.
+     */
+    private boolean isListAttr;
+
+    /**
+     * If the added attribute has to be accessed in a fully qualified manner.
+     */
+    private boolean isQualifiedName;
+
+    /**
+     * The class info will be used to set the attribute type and package info
+     * will be use for qualified name.
+     */
+    private JavaQualifiedTypeInfo importInfo;
+
+    /**
+     * Creates a java attribute info object.
+     */
+    private JavaAttributeInfo() {
+    }
+
+    /**
+     * Creates object of java attribute info.
+     *
+     * @param attrType YANG type
+     * @param name attribute name
+     * @param isListAttr is list attribute
+     * @param isQualifiedName is qualified name
+     */
+    public JavaAttributeInfo(YangType<?> attrType, String name, boolean isListAttr, boolean isQualifiedName) {
+        this.attrType = attrType;
+        this.name = name;
+        this.isListAttr = isListAttr;
+        this.isQualifiedName = isQualifiedName;
+    }
+
+    /**
+     * Returns the data type info of attribute.
+     *
+     * @return the data type info of attribute
+     */
+    public YangType<?> getAttributeType() {
+
+        if (attrType == null) {
+            throw new TranslatorException("Expected java attribute type is null");
+        }
+        return attrType;
+    }
+
+    /**
+     * Sets the data type info of attribute.
+     *
+     * @param type the data type info of attribute
+     */
+    public void setAttributeType(YangType<?> type) {
+        attrType = type;
+    }
+
+    /**
+     * Returns name of the attribute.
+     *
+     * @return name of the attribute
+     */
+    public String getAttributeName() {
+
+        if (name == null) {
+            throw new TranslatorException("Expected java attribute name is null");
+        }
+        return name;
+    }
+
+    /**
+     * Sets name of the attribute.
+     *
+     * @param attrName name of the attribute
+     */
+    public void setAttributeName(String attrName) {
+        name = attrName;
+    }
+
+    /**
+     * Returns if the added attribute is a list of info.
+     *
+     * @return the if the added attribute is a list of info
+     */
+    public boolean isListAttr() {
+        return isListAttr;
+    }
+
+    /**
+     * Sets if the added attribute is a list of info.
+     *
+     * @param isList if the added attribute is a list of info
+     */
+    public void setListAttr(boolean isList) {
+        isListAttr = isList;
+    }
+
+    /**
+     * Returns if the added attribute has to be accessed in a fully qualified
+     * manner.
+     *
+     * @return the if the added attribute has to be accessed in a fully
+     * qualified manner.
+     */
+    public boolean isQualifiedName() {
+        return isQualifiedName;
+    }
+
+    /**
+     * Sets if the added attribute has to be accessed in a fully qualified
+     * manner.
+     *
+     * @param isQualified if the added attribute has to be accessed in a fully
+     * qualified manner
+     */
+    public void setIsQualifiedAccess(boolean isQualified) {
+        isQualifiedName = isQualified;
+    }
+
+    /**
+     * Returns the import info for the attribute type. It will be null, if the type
+     * is basic built-in java type.
+     *
+     * @return import info
+     */
+    public JavaQualifiedTypeInfo getImportInfo() {
+        return importInfo;
+    }
+
+    /**
+     * Sets the import info for the attribute type.
+     *
+     * @param importInfo import info for the attribute type
+     */
+    public void setImportInfo(JavaQualifiedTypeInfo importInfo) {
+        this.importInfo = importInfo;
+    }
+
+    /**
+     * Returns java attribute info.
+     *
+     * @param importInfo java qualified type info
+     * @param attributeName attribute name
+     * @param attributeType attribute type
+     * @param isQualifiedAccess is the attribute a qualified access
+     * @param isListAttribute is list attribute
+     * @return java attribute info.
+     */
+    public static JavaAttributeInfo getAttributeInfoForTheData(JavaQualifiedTypeInfo importInfo, String attributeName,
+            YangType<?> attributeType, boolean isQualifiedAccess,
+            boolean isListAttribute) {
+
+        JavaAttributeInfo newAttr = new JavaAttributeInfo();
+        newAttr.setImportInfo(importInfo);
+        newAttr.setAttributeName(attributeName);
+        newAttr.setAttributeType(attributeType);
+        newAttr.setIsQualifiedAccess(isQualifiedAccess);
+        newAttr.setListAttr(isListAttribute);
+
+        return newAttr;
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/JavaCodeGenerator.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/JavaCodeGenerator.java
new file mode 100644
index 0000000..277038c
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/JavaCodeGenerator.java
@@ -0,0 +1,43 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.translator.tojava;
+
+import org.onosproject.yangutils.translator.exception.TranslatorException;
+import org.onosproject.yangutils.translator.tojava.utils.YangPluginConfig;
+
+/**
+ * Abstraction of an entity which provides Code generator functionalities.
+ */
+public interface JavaCodeGenerator {
+
+    /**
+     * Traverse the schema of application and generate corresponding code.
+     *
+     * @param yangPlugin YANG plugin config
+     * @throws TranslatorException when fails to translate the data model tree
+     */
+    void generateCodeEntry(YangPluginConfig yangPlugin)
+            throws TranslatorException;
+
+    /**
+     * Traverse the schema of application and generate corresponding code.
+     *
+     * @throws TranslatorException when fails to generate java code
+     */
+    void generateCodeExit()
+            throws TranslatorException;
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/JavaCodeGeneratorUtil.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/JavaCodeGeneratorUtil.java
new file mode 100644
index 0000000..a6eb9d7
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/JavaCodeGeneratorUtil.java
@@ -0,0 +1,262 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.translator.tojava;
+
+import java.io.IOException;
+
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.translator.exception.TranslatorException;
+import org.onosproject.yangutils.translator.tojava.utils.YangPluginConfig;
+
+import static org.onosproject.yangutils.translator.tojava.TraversalType.CHILD;
+import static org.onosproject.yangutils.translator.tojava.TraversalType.PARENT;
+import static org.onosproject.yangutils.translator.tojava.TraversalType.ROOT;
+import static org.onosproject.yangutils.translator.tojava.TraversalType.SIBILING;
+
+/**
+ * Representation of java code generator based on application schema.
+ */
+public final class JavaCodeGeneratorUtil {
+
+    /**
+     * Current YANG node.
+     */
+    private static YangNode curNode;
+
+    /**
+     * Creates a java code generator utility object.
+     */
+    private JavaCodeGeneratorUtil() {
+    }
+
+    /**
+     * Returns current YANG node.
+     *
+     * @return current YANG node
+     */
+    public static YangNode getCurNode() {
+        return curNode;
+    }
+
+    /**
+     * Sets current YANG node.
+     *
+     * @param node current YANG node
+     */
+    public static void setCurNode(YangNode node) {
+        curNode = node;
+    }
+
+    /**
+     * Generates Java code files corresponding to the YANG schema.
+     *
+     * @param rootNode   root node of the data model tree
+     * @param yangPlugin YANG plugin config
+     * @throws TranslatorException when fails to generate java code file the current
+     *                             node
+     */
+    public static void generateJavaCode(YangNode rootNode, YangPluginConfig yangPlugin)
+            throws TranslatorException {
+
+        YangNode codeGenNode = rootNode;
+        TraversalType curTraversal = ROOT;
+
+        while (codeGenNode != null) {
+            if (curTraversal != PARENT) {
+                if (!(codeGenNode instanceof JavaCodeGenerator)) {
+                    throw new TranslatorException("Unsupported node to generate code");
+                }
+
+                setCurNode(codeGenNode);
+                try {
+                    generateCodeEntry(codeGenNode, yangPlugin);
+                } catch (Exception e) {
+                    throw new TranslatorException(e.getMessage());
+                }
+
+            }
+            if (curTraversal != PARENT && codeGenNode.getChild() != null) {
+                curTraversal = CHILD;
+                codeGenNode = codeGenNode.getChild();
+            } else if (codeGenNode.getNextSibling() != null) {
+                try {
+                    generateCodeExit(codeGenNode);
+                } catch (Exception e) {
+                    throw new TranslatorException(e.getMessage());
+                }
+                curTraversal = SIBILING;
+                codeGenNode = codeGenNode.getNextSibling();
+            } else {
+                try {
+                    generateCodeExit(codeGenNode);
+                } catch (Exception e) {
+                    throw new TranslatorException(e.getMessage());
+                }
+                curTraversal = PARENT;
+                codeGenNode = codeGenNode.getParent();
+            }
+        }
+    }
+
+    /**
+     * Generates the current nodes code snippet.
+     *
+     * @param codeGenNode current data model node for which the code needs to be
+     *                    generated
+     * @param yangPlugin  YANG plugin config
+     * @throws TranslatorException when fails to generate java code file the current
+     *                             node
+     */
+    private static void generateCodeEntry(YangNode codeGenNode, YangPluginConfig yangPlugin)
+            throws TranslatorException {
+
+        if (codeGenNode instanceof JavaCodeGenerator) {
+            ((JavaCodeGenerator) codeGenNode).generateCodeEntry(yangPlugin);
+        } else {
+            throw new TranslatorException(
+                    "Generated data model node cannot be translated to target language code");
+        }
+    }
+
+    /**
+     * Generates the current nodes code target code from the snippet.
+     *
+     * @param codeGenNode current data model node for which the code needs to be
+     *                    generated
+     * @throws TranslatorException when fails to generate java code file the current
+     *                             node
+     */
+    private static void generateCodeExit(YangNode codeGenNode)
+            throws TranslatorException {
+
+        if (codeGenNode instanceof JavaCodeGenerator) {
+            ((JavaCodeGenerator) codeGenNode).generateCodeExit();
+        } else {
+            throw new TranslatorException(
+                    "Generated data model node cannot be translated to target language code");
+        }
+    }
+
+    /**
+     * Free other YANG nodes of data-model tree when error occurs while file
+     * generation of current node.
+     */
+    private static void freeRestResources() {
+
+        YangNode freedNode = getCurNode();
+        if (getCurNode() != null) {
+            YangNode tempNode = freedNode;
+            TraversalType curTraversal = ROOT;
+
+            while (freedNode != tempNode.getParent()) {
+
+                if (curTraversal != PARENT && freedNode.getChild() != null) {
+                    curTraversal = CHILD;
+                    freedNode = freedNode.getChild();
+                } else if (freedNode.getNextSibling() != null) {
+                    curTraversal = SIBILING;
+                    if (freedNode != tempNode) {
+                        free(freedNode);
+                    }
+                    freedNode = freedNode.getNextSibling();
+                } else {
+                    curTraversal = PARENT;
+                    if (freedNode != tempNode) {
+                        free(freedNode);
+                    }
+                    freedNode = freedNode.getParent();
+                }
+            }
+        }
+    }
+
+    /**
+     * Free the current node.
+     *
+     * @param node YANG node
+     */
+    private static void free(YangNode node) {
+
+        YangNode parent = node.getParent();
+        parent.setChild(null);
+
+        if (node.getNextSibling() != null) {
+            parent.setChild(node.getNextSibling());
+        } else if (node.getPreviousSibling() != null) {
+            parent.setChild(node.getPreviousSibling());
+        }
+        node = null;
+    }
+
+    /**
+     * Delete Java code files corresponding to the YANG schema.
+     *
+     * @param rootNode root node of data-model tree
+     * @throws IOException when fails to delete java code file the current node
+     */
+    public static void translatorErrorHandler(YangNode rootNode)
+            throws IOException {
+
+        if (rootNode != null) {
+            /**
+             * Free other resources where translator has failed.
+             */
+            freeRestResources();
+
+            /**
+             * Start removing all open files.
+             */
+            YangNode tempNode = rootNode;
+            setCurNode(tempNode.getChild());
+            TraversalType curTraversal = ROOT;
+
+            while (tempNode != null) {
+
+                if (curTraversal != PARENT) {
+                    close(tempNode);
+                }
+                if (curTraversal != PARENT && tempNode.getChild() != null) {
+                    curTraversal = CHILD;
+                    tempNode = tempNode.getChild();
+                } else if (tempNode.getNextSibling() != null) {
+                    curTraversal = SIBILING;
+                    tempNode = tempNode.getNextSibling();
+                } else {
+                    curTraversal = PARENT;
+                    tempNode = tempNode.getParent();
+                }
+            }
+
+            freeRestResources();
+        }
+    }
+
+    /**
+     * Closes all the current open file handles of node and delete all generated
+     * files.
+     *
+     * @param node current YANG node
+     * @throws IOException when fails to do IO operations
+     */
+    private static void close(YangNode node)
+            throws IOException {
+        if (node instanceof JavaCodeGenerator && ((TempJavaCodeFragmentFilesContainer) node)
+                .getTempJavaCodeFragmentFiles() != null) {
+            ((TempJavaCodeFragmentFilesContainer) node).getTempJavaCodeFragmentFiles().freeTemporaryResources(true);
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/JavaFileInfo.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/JavaFileInfo.java
new file mode 100644
index 0000000..28302ee
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/JavaFileInfo.java
@@ -0,0 +1,184 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.translator.tojava;
+
+import java.io.Serializable;
+
+import org.onosproject.yangutils.translator.tojava.utils.YangPluginConfig;
+
+/**
+ * Represents cached java file handle, which supports the addition of member attributes and
+ * methods.
+ */
+public class JavaFileInfo implements Serializable {
+
+    private static final long serialVersionUID = 806102633L;
+
+    /**
+     * The type(s) of java source file(s) to be generated when the cached file
+     * handle is closed.
+     */
+    private transient int genFileTypes;
+
+    /**
+     * Name of the module.
+     */
+    private String javaName;
+
+    /**
+     * Java Package of the mapped java class.
+     */
+    private String pkg;
+
+    /**
+     * File generation directory path.
+     */
+    private String relativeFilePath;
+
+    /**
+     * File generation base directory path.
+     */
+    private String codeGenDirFilePath;
+
+    /**
+     * Plugin configuration for naming convention.
+     */
+    private transient YangPluginConfig pluginConfig;
+
+    /**
+     * Returns the types of files being generated corresponding to the YANG
+     * definition.
+     *
+     * @return the types of files being generated corresponding to the YANG
+     * definition
+     */
+    public int getGeneratedFileTypes() {
+        return genFileTypes;
+    }
+
+    /**
+     * Sets the types of files being generated corresponding to the YANG
+     * definition.
+     *
+     * @param fileTypes the types of files being generated corresponding to the
+     * YANG definition
+     */
+    public void setGeneratedFileTypes(int fileTypes) {
+        genFileTypes = fileTypes;
+    }
+
+    /**
+     * Adds the types of files being generated corresponding to the YANG
+     * definition.
+     *
+     * @param fileTypes the types of files being generated corresponding to the
+     * YANG definition
+     */
+    public void addGeneratedFileTypes(int fileTypes) {
+        genFileTypes |= fileTypes;
+    }
+
+    /**
+     * Returns the java name of the node.
+     *
+     * @return the java name of node
+     */
+    public String getJavaName() {
+        return javaName;
+    }
+
+    /**
+     * Sets the java name of the node.
+     *
+     * @param name the java name of node
+     */
+    public void setJavaName(String name) {
+        javaName = name;
+    }
+
+    /**
+     * Returns the mapped java package.
+     *
+     * @return the java package
+     */
+    public String getPackage() {
+        return pkg;
+    }
+
+    /**
+     * Sets the node's package.
+     *
+     * @param nodePackage node's package
+     */
+    public void setPackage(String nodePackage) {
+        pkg = nodePackage;
+    }
+
+    /**
+     * Sets directory package path for code generation.
+     *
+     * @param path directory package path for code generation
+     */
+    public void setPackageFilePath(String path) {
+        relativeFilePath = path;
+    }
+
+    /**
+     * Returns directory package path for code generation.
+     *
+     * @return directory package path for code generation
+     */
+    public String getPackageFilePath() {
+        return relativeFilePath;
+    }
+
+    /**
+     * Returns base directory package path for code generation.
+     *
+     * @return directory package path for code generation
+     */
+    public String getBaseCodeGenPath() {
+        return codeGenDirFilePath;
+    }
+
+    /**
+     * Sets base directory package path for code generation.
+     *
+     * @param path base directory path
+     */
+    public void setBaseCodeGenPath(String path) {
+        codeGenDirFilePath = path;
+    }
+
+    /**
+     * Returns plugin configurations.
+     *
+     * @return the pluginConfig
+     */
+    public YangPluginConfig getPluginConfig() {
+        return pluginConfig;
+    }
+
+    /**
+     * Sets plugin configurations.
+     *
+     * @param pluginConfig the pluginConfig to set
+     */
+    public void setPluginConfig(YangPluginConfig pluginConfig) {
+        this.pluginConfig = pluginConfig;
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/JavaFileInfoContainer.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/JavaFileInfoContainer.java
new file mode 100644
index 0000000..485df77
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/JavaFileInfoContainer.java
@@ -0,0 +1,37 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.yangutils.translator.tojava;
+
+/**
+ * Represents data model nodes which are required to generate java classes, need to support
+ * java file info.
+ */
+public interface JavaFileInfoContainer {
+
+    /**
+     * Returns the generated java file information.
+     *
+     * @return generated java file information
+     */
+    JavaFileInfo getJavaFileInfo();
+
+    /**
+     * Sets the java file info object.
+     *
+     * @param javaInfo java file info object
+     */
+    void setJavaFileInfo(JavaFileInfo javaInfo);
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/JavaImportData.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/JavaImportData.java
new file mode 100644
index 0000000..b1c36ec
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/JavaImportData.java
@@ -0,0 +1,284 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.yangutils.translator.tojava;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.SortedSet;
+import java.util.TreeSet;
+
+import static org.onosproject.yangutils.utils.UtilConstants.ABSTRACT_EVENT;
+import static org.onosproject.yangutils.utils.UtilConstants.ARRAY_LIST;
+import static org.onosproject.yangutils.utils.UtilConstants.AUGMENTATION_HOLDER_CLASS_IMPORT_CLASS;
+import static org.onosproject.yangutils.utils.UtilConstants.AUGMENTED_INFO_CLASS_IMPORT_CLASS;
+import static org.onosproject.yangutils.utils.UtilConstants.AUGMENTED_INFO_CLASS_IMPORT_PKG;
+import static org.onosproject.yangutils.utils.UtilConstants.COLLECTION_IMPORTS;
+import static org.onosproject.yangutils.utils.UtilConstants.EMPTY_STRING;
+import static org.onosproject.yangutils.utils.UtilConstants.EVENT_LISTENER;
+import static org.onosproject.yangutils.utils.UtilConstants.GOOGLE_MORE_OBJECT_IMPORT_CLASS;
+import static org.onosproject.yangutils.utils.UtilConstants.GOOGLE_MORE_OBJECT_IMPORT_PKG;
+import static org.onosproject.yangutils.utils.UtilConstants.IMPORT;
+import static org.onosproject.yangutils.utils.UtilConstants.JAVA_LANG;
+import static org.onosproject.yangutils.utils.UtilConstants.JAVA_UTIL_OBJECTS_IMPORT_CLASS;
+import static org.onosproject.yangutils.utils.UtilConstants.JAVA_UTIL_OBJECTS_IMPORT_PKG;
+import static org.onosproject.yangutils.utils.UtilConstants.LIST;
+import static org.onosproject.yangutils.utils.UtilConstants.LISTENER_REG;
+import static org.onosproject.yangutils.utils.UtilConstants.LISTENER_SERVICE;
+import static org.onosproject.yangutils.utils.UtilConstants.NEW_LINE;
+import static org.onosproject.yangutils.utils.UtilConstants.ONOS_EVENT_PKG;
+import static org.onosproject.yangutils.utils.UtilConstants.PERIOD;
+import static org.onosproject.yangutils.utils.UtilConstants.PROVIDED_AUGMENTATION_CLASS_IMPORT_PKG;
+import static org.onosproject.yangutils.utils.UtilConstants.SEMI_COLAN;
+
+import static java.util.Collections.sort;
+
+/**
+ * Represents that generated Java file can contain imports.
+ */
+public class JavaImportData {
+
+    /**
+     * Flag to denote if any list in imported.
+     */
+    private boolean isListToImport;
+
+    /**
+     * Sorted set of import info, to be used to maintain the set of classes to
+     * be imported in the generated class.
+     */
+    private SortedSet<JavaQualifiedTypeInfo> importSet;
+
+    /**
+     * Creates java import data object.
+     */
+    public JavaImportData() {
+        setImportSet(new TreeSet<JavaQualifiedTypeInfo>());
+    }
+
+    /**
+     * Returns if the list needs to be imported.
+     *
+     * @return true if any of the attribute needs to be maintained as a list
+     */
+    public boolean getIfListImported() {
+        return isListToImport;
+    }
+
+    /**
+     * Sets the status of importing list.
+     *
+     * @param isList status to mention list is bing imported
+     */
+    public void setIfListImported(boolean isList) {
+        isListToImport = isList;
+    }
+
+    /**
+     * Returns the set containing the imported class/interface info.
+     *
+     * @return the set containing the imported class/interface info
+     */
+    public SortedSet<JavaQualifiedTypeInfo> getImportSet() {
+        return importSet;
+    }
+
+    /**
+     * Assigns the set containing the imported class/interface info.
+     *
+     * @param importSet the set containing the imported class/interface info
+     */
+    private void setImportSet(SortedSet<JavaQualifiedTypeInfo> importSet) {
+        this.importSet = importSet;
+    }
+
+    /**
+     * Adds an imported class/interface info if it is not already part of the
+     * collection.
+     *
+     * If already part of the collection, check if the packages are same, if so
+     * then return true, to denote it is already in the import collection, and
+     * it can be accessed without qualified access. If the packages do not
+     * match, then do not add to the import collection, and return false to
+     * denote, it is not added to import collection and needs to be accessed in
+     * a qualified manner.
+     *
+     * @param newImportInfo class/interface info being imported
+     * @param className     name of the call being generated
+     * @param classPkg      generated class package
+     * @return qualified access status of the import node being added
+     */
+    public boolean addImportInfo(JavaQualifiedTypeInfo newImportInfo,
+            String className, String classPkg) {
+
+        if (newImportInfo.getClassInfo().contentEquals(className)) {
+            /*
+             * if the current class name is same as the attribute class name,
+             * then the attribute must be accessed in a qualified manner.
+             */
+            return true;
+        } else if (newImportInfo.getPkgInfo() == null) {
+            /*
+             * If the package info is null, then it is not a candidate for import / qualified access
+             */
+            return false;
+        }
+
+        /*
+         * If the attribute type is having the package info, it is contender
+         * for import list and also need to check if it needs to be a
+         * qualified access.
+         */
+        if (newImportInfo.getPkgInfo().contentEquals(classPkg)) {
+            /**
+             * Package of the referred attribute and the generated class is same, so no need import
+             * or qualified access.
+             */
+            return false;
+        }
+
+        for (JavaQualifiedTypeInfo curImportInfo : getImportSet()) {
+            if (curImportInfo.getClassInfo()
+                    .contentEquals(newImportInfo.getClassInfo())) {
+                return !curImportInfo.getPkgInfo()
+                        .contentEquals(newImportInfo.getPkgInfo());
+            }
+        }
+
+        /*
+         * import is added, so it is a member for non qualified access
+         */
+        getImportSet().add(newImportInfo);
+        return false;
+    }
+
+    /**
+     * Returns import for class.
+     *
+     * @return imports for class
+     */
+    public List<String> getImports() {
+
+        String importString;
+        List<String> imports = new ArrayList<>();
+
+        for (JavaQualifiedTypeInfo importInfo : getImportSet()) {
+            if (!importInfo.getPkgInfo().equals(EMPTY_STRING) && importInfo.getClassInfo() != null
+                    && !importInfo.getPkgInfo().equals(JAVA_LANG)) {
+                importString = IMPORT + importInfo.getPkgInfo() + PERIOD + importInfo.getClassInfo() + SEMI_COLAN
+                        + NEW_LINE;
+
+                imports.add(importString);
+            }
+        }
+
+        if (getIfListImported()) {
+            imports.add(getImportForList());
+        }
+
+        sort(imports);
+        return imports;
+    }
+
+    /**
+     * Returns import for hash and equals method.
+     *
+     * @return import for hash and equals method
+     */
+    public String getImportForHashAndEquals() {
+        return IMPORT + JAVA_UTIL_OBJECTS_IMPORT_PKG + PERIOD + JAVA_UTIL_OBJECTS_IMPORT_CLASS;
+    }
+
+    /**
+     * Returns import for to string method.
+     *
+     * @return import for to string method
+     */
+    public String getImportForToString() {
+        return IMPORT + GOOGLE_MORE_OBJECT_IMPORT_PKG + PERIOD + GOOGLE_MORE_OBJECT_IMPORT_CLASS;
+    }
+
+    /**
+     * Returns import for list attribute.
+     *
+     * @return import for list attribute
+     */
+    public String getImportForList() {
+        return IMPORT + COLLECTION_IMPORTS + PERIOD + LIST + SEMI_COLAN + NEW_LINE;
+    }
+
+    /**
+     * Returns import for array list attribute.
+     *
+     * @return import for array list attribute
+     */
+    public String getImportForArrayList() {
+        return IMPORT + COLLECTION_IMPORTS + PERIOD + ARRAY_LIST + SEMI_COLAN + NEW_LINE;
+    }
+
+    /**
+     * Returns import string for AugmentationHolder class.
+     *
+     * @return import string for AugmentationHolder class
+     */
+    public String getAugmentationHolderImport() {
+        return IMPORT + PROVIDED_AUGMENTATION_CLASS_IMPORT_PKG + PERIOD + AUGMENTATION_HOLDER_CLASS_IMPORT_CLASS;
+    }
+
+    /**
+     * Returns import string for AugmentedInfo class.
+     *
+     * @return import string for AugmentedInfo class
+     */
+    public String getAugmentedInfoImport() {
+        return IMPORT + AUGMENTED_INFO_CLASS_IMPORT_PKG + PERIOD + AUGMENTED_INFO_CLASS_IMPORT_CLASS;
+    }
+
+    /**
+     * Returns import string for ListenerService class.
+     *
+     * @return import string for ListenerService class
+     */
+    public String getListenerServiceImport() {
+        return IMPORT + ONOS_EVENT_PKG + PERIOD + LISTENER_SERVICE + SEMI_COLAN + NEW_LINE;
+    }
+
+    /**
+     * Returns import string for ListenerRegistry class.
+     *
+     * @return import string for ListenerRegistry class
+     */
+    public String getListenerRegistryImport() {
+        return IMPORT + ONOS_EVENT_PKG + PERIOD + LISTENER_REG + SEMI_COLAN + NEW_LINE;
+    }
+
+    /**
+     * Returns import string for AbstractEvent class.
+     *
+     * @return import string for AbstractEvent class
+     */
+    public String getAbstractEventsImport() {
+        return IMPORT + ONOS_EVENT_PKG + PERIOD + ABSTRACT_EVENT + SEMI_COLAN + NEW_LINE;
+    }
+
+    /**
+     * Returns import string for EventListener class.
+     *
+     * @return import string for EventListener class
+     */
+    public String getEventListenerImport() {
+        return IMPORT + ONOS_EVENT_PKG + PERIOD + EVENT_LISTENER + SEMI_COLAN + NEW_LINE;
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/JavaImportDataContainer.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/JavaImportDataContainer.java
new file mode 100644
index 0000000..e86b468
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/JavaImportDataContainer.java
@@ -0,0 +1,37 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.yangutils.translator.tojava;
+
+/**
+ * Represents the information of the java import data.
+ */
+public interface JavaImportDataContainer {
+
+    /**
+     * Returns the data of java imports to be included in generated file.
+     *
+     * @return data of java imports to be included in generated file
+     */
+    JavaImportData getJavaImportData();
+
+    /**
+     * Sets the data of java imports to be included in generated file.
+     *
+     * @param javaImportData data of java imports to be included in generated
+     *            file
+     */
+    void setJavaImportData(JavaImportData javaImportData);
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/JavaQualifiedTypeInfo.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/JavaQualifiedTypeInfo.java
new file mode 100644
index 0000000..98e44f8
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/JavaQualifiedTypeInfo.java
@@ -0,0 +1,235 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.translator.tojava;
+
+import java.io.Serializable;
+import java.util.Objects;
+
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.translator.exception.TranslatorException;
+import org.onosproject.yangutils.translator.tojava.javamodel.JavaLeafInfoContainer;
+import org.onosproject.yangutils.translator.tojava.utils.AttributesJavaDataType;
+import org.onosproject.yangutils.translator.tojava.utils.YangToJavaNamingConflictUtil;
+
+import com.google.common.base.MoreObjects;
+
+import static org.onosproject.yangutils.translator.tojava.utils.AttributesJavaDataType.getJavaImportClass;
+import static org.onosproject.yangutils.translator.tojava.utils.AttributesJavaDataType.getJavaImportPackage;
+
+/**
+ * Represents the information about individual imports in the generated file.
+ */
+public class JavaQualifiedTypeInfo
+        implements Comparable<JavaQualifiedTypeInfo>, Serializable {
+
+    private static final long serialVersionUID = 806201634L;
+
+    /**
+     * Package location where the imported class/interface is defined.
+     */
+    private String pkgInfo;
+
+    /**
+     * Class/interface being referenced.
+     */
+    private String classInfo;
+
+    /**
+     * Creates a java qualified type info object.
+     */
+    public JavaQualifiedTypeInfo() {
+    }
+
+    /**
+     * Returns the imported package info.
+     *
+     * @return the imported package info
+     */
+    public String getPkgInfo() {
+        return pkgInfo;
+    }
+
+    /**
+     * Sets the imported package info.
+     *
+     * @param pkgInfo the imported package info
+     */
+    public void setPkgInfo(String pkgInfo) {
+        this.pkgInfo = pkgInfo;
+    }
+
+    /**
+     * Returns the imported class/interface info.
+     *
+     * @return the imported class/interface info
+     */
+    public String getClassInfo() {
+        return classInfo;
+    }
+
+    /**
+     * Sets the imported class/interface info.
+     *
+     * @param classInfo the imported class/interface info
+     */
+    public void setClassInfo(String classInfo) {
+        this.classInfo = classInfo;
+    }
+
+    /**
+     * Updates the leaf's java information.
+     *
+     * @param leaf leaf whose java information is being updated
+     */
+    public static void updateLeavesJavaQualifiedInfo(JavaLeafInfoContainer leaf) {
+
+        JavaQualifiedTypeInfo importInfo = leaf.getJavaQualifiedInfo();
+
+        if (leaf.getDataType() == null) {
+            throw new TranslatorException("missing data type of leaf " + leaf.getName());
+        }
+
+        /*
+         * Current leaves holder is adding a leaf info as a attribute to the
+         * current class.
+         */
+        String className = AttributesJavaDataType.getJavaImportClass(leaf.getDataType(), leaf.isLeafList(),
+                leaf.getConflictResolveConfig());
+        if (className != null) {
+            /*
+             * Corresponding to the attribute type a class needs to be imported,
+             * since it can be a derived type or a usage of wrapper classes.
+             */
+            importInfo.setClassInfo(className);
+            String classPkg = AttributesJavaDataType.getJavaImportPackage(leaf.getDataType(),
+                    leaf.isLeafList(), leaf.getConflictResolveConfig());
+            if (classPkg == null) {
+                throw new TranslatorException("import package cannot be null when the class is used");
+            }
+            importInfo.setPkgInfo(classPkg);
+        } else {
+            /*
+             * The attribute does not need a class to be imported, for example
+             * built in java types.
+             */
+            String dataTypeName = AttributesJavaDataType.getJavaDataType(leaf.getDataType());
+            if (dataTypeName == null) {
+                throw new TranslatorException("not supported data type");
+            }
+            importInfo.setClassInfo(dataTypeName);
+        }
+    }
+
+    /**
+     * Returns the import info for an attribute, which needs to be used for code
+     * generation for import or for qualified access.
+     *
+     * @param curNode       current data model node for which the java file is being
+     *                      generated
+     * @param attributeName name of the attribute being added, it will used in
+     *                      import info for child class
+     * @return return the import info for this attribute
+     */
+    public static JavaQualifiedTypeInfo getQualifiedTypeInfoOfCurNode(YangNode curNode,
+            String attributeName) {
+
+        JavaQualifiedTypeInfo importInfo = new JavaQualifiedTypeInfo();
+
+        if (!(curNode instanceof JavaFileInfoContainer)) {
+            throw new TranslatorException("missing java file information to get the package details "
+                    + "of attribute corresponding to child node");
+        }
+
+        importInfo.setClassInfo(attributeName);
+        importInfo.setPkgInfo(((JavaFileInfoContainer) curNode)
+                .getJavaFileInfo().getPackage());
+
+        return importInfo;
+    }
+
+    /**
+     * Returns the java qualified type information for the wrapper classes.
+     *
+     * @param referredTypesAttrInfo attribute of referred type
+     * @param conflictResolver      plugin configurations
+     * @return return the import info for this attribute
+     */
+    public static JavaQualifiedTypeInfo getQualifiedInfoOfFromString(JavaAttributeInfo referredTypesAttrInfo,
+            YangToJavaNamingConflictUtil conflictResolver) {
+
+        /*
+         * Get the java qualified type information for the wrapper classes and
+         * set it in new java attribute information.
+         */
+        JavaQualifiedTypeInfo qualifiedInfoOfFromString = new JavaQualifiedTypeInfo();
+
+        qualifiedInfoOfFromString.setClassInfo(
+                getJavaImportClass(referredTypesAttrInfo.getAttributeType(), true, conflictResolver));
+        qualifiedInfoOfFromString.setPkgInfo(
+                getJavaImportPackage(referredTypesAttrInfo.getAttributeType(), true, conflictResolver));
+        return qualifiedInfoOfFromString;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(pkgInfo, classInfo);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+
+        if (this == obj) {
+            return true;
+        }
+        if (obj instanceof JavaQualifiedTypeInfo) {
+            JavaQualifiedTypeInfo other = (JavaQualifiedTypeInfo) obj;
+            return Objects.equals(pkgInfo, other.pkgInfo) &&
+                    Objects.equals(classInfo, other.classInfo);
+        }
+        return false;
+    }
+
+    /**
+     * Checks if the import info matches.
+     *
+     * @param importInfo matched import
+     * @return if equal or not
+     */
+    public boolean exactMatch(JavaQualifiedTypeInfo importInfo) {
+        return equals(importInfo)
+                && Objects.equals(pkgInfo, importInfo.getPkgInfo())
+                && Objects.equals(classInfo, importInfo.getClassInfo());
+    }
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(getClass())
+                .add("pkgInfo", pkgInfo)
+                .add("classInfo", classInfo).toString();
+    }
+
+    /**
+     * Checks that there is no 2 objects with the same class name.
+     *
+     * @param other compared import info.
+     */
+    @Override
+    public int compareTo(JavaQualifiedTypeInfo other) {
+        return getClassInfo().compareTo(other.getClassInfo());
+    }
+
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/JavaQualifiedTypeInfoContainer.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/JavaQualifiedTypeInfoContainer.java
new file mode 100644
index 0000000..c6570c6
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/JavaQualifiedTypeInfoContainer.java
@@ -0,0 +1,36 @@
+/*
+ * Copyright 2016 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.yangutils.translator.tojava;
+
+/**
+ * Maintain the java qualified access details for an attribute or a class.
+ */
+public interface JavaQualifiedTypeInfoContainer {
+
+    /**
+     * Obtain the java qualified details.
+     *
+     * @return java qualified type details
+     */
+    JavaQualifiedTypeInfo getJavaQualifiedInfo();
+
+    /**
+     * Assign the qualified type info.
+     *
+     * @param typeInfo qualified type information
+     */
+    void setJavaQualifiedInfo(JavaQualifiedTypeInfo typeInfo);
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/TempJavaBeanFragmentFiles.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/TempJavaBeanFragmentFiles.java
new file mode 100644
index 0000000..14f4cd2
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/TempJavaBeanFragmentFiles.java
@@ -0,0 +1,129 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.translator.tojava;
+
+import java.io.File;
+import java.io.IOException;
+
+import org.onosproject.yangutils.translator.tojava.utils.YangPluginConfig;
+
+import static org.onosproject.yangutils.translator.tojava.GeneratedTempFileType.CONSTRUCTOR_IMPL_MASK;
+import static org.onosproject.yangutils.translator.tojava.utils.MethodsGenerator.getConstructor;
+import static org.onosproject.yangutils.translator.tojava.utils.TempJavaCodeFragmentFilesUtils.closeFile;
+
+/**
+ * Represents implementation of java bean code fragments temporary implementations.
+ * Maintains the temp files required specific for bean java snippet generation.
+ */
+public class TempJavaBeanFragmentFiles
+        extends TempJavaFragmentFiles {
+
+    /**
+     * File name for constructor.
+     */
+    private static final String CONSTRUCTOR_FILE_NAME = "Constructor";
+
+    /**
+     * Temporary file handle for constructor of class.
+     */
+    private File constructorImplTempFileHandle;
+
+    /**
+     * Creates an instance of temporary java code fragment.
+     *
+     * @param javaFileInfo generated java file info
+     * @throws IOException when fails to create new file handle
+     */
+    public TempJavaBeanFragmentFiles(JavaFileInfo javaFileInfo)
+            throws IOException {
+
+        super(javaFileInfo);
+
+        /*
+         * Initialize getterImpl, attributes, constructor, hash code, equals and
+         * to strings when generation file type matches to impl class mask.
+         */
+        addGeneratedTempFile(CONSTRUCTOR_IMPL_MASK);
+
+        setConstructorImplTempFileHandle(getTemporaryFileHandle(CONSTRUCTOR_FILE_NAME));
+    }
+
+    /**
+     * Returns constructor's temporary file handle.
+     *
+     * @return temporary file handle
+     */
+    public File getConstructorImplTempFileHandle() {
+        return constructorImplTempFileHandle;
+    }
+
+    /**
+     * Sets to constructor's temporary file handle.
+     *
+     * @param constructor file handle for to constructor
+     */
+    private void setConstructorImplTempFileHandle(File constructor) {
+        constructorImplTempFileHandle = constructor;
+    }
+
+    /**
+     * Adds constructor for class.
+     *
+     * @param attr attribute info
+     * @throws IOException when fails to append to temporary file
+     */
+    private void addConstructor(JavaAttributeInfo attr, YangPluginConfig pluginConfig)
+            throws IOException {
+        appendToFile(getConstructorImplTempFileHandle(), getConstructor(getGeneratedJavaClassName(), attr,
+                getGeneratedJavaFiles(), pluginConfig));
+    }
+
+    /**
+     * Adds the new attribute info to the target generated temporary files.
+     *
+     * @param newAttrInfo the attribute info that needs to be added to temporary
+     * files
+     * @throws IOException IO operation fail
+     */
+    @Override
+    void addJavaSnippetInfoToApplicableTempFiles(JavaAttributeInfo newAttrInfo, YangPluginConfig pluginConfig)
+            throws IOException {
+        super.addJavaSnippetInfoToApplicableTempFiles(newAttrInfo, pluginConfig);
+        addConstructor(newAttrInfo, pluginConfig);
+    }
+
+    /**
+     * Removes all temporary file handles.
+     *
+     * @param isErrorOccurred when translator fails to generate java files we
+     * need to close all open file handles include temporary files
+     * and java files.
+     * @throws IOException when failed to delete the temporary files
+     */
+    @Override
+    public void freeTemporaryResources(boolean isErrorOccurred)
+            throws IOException {
+
+        /*
+         * Close constructor temporary file handle and delete the file.
+         */
+        closeFile(getConstructorImplTempFileHandle(), true);
+
+        super.freeTemporaryResources(isErrorOccurred);
+    }
+
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/TempJavaCodeFragmentFiles.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/TempJavaCodeFragmentFiles.java
new file mode 100644
index 0000000..309ee66
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/TempJavaCodeFragmentFiles.java
@@ -0,0 +1,317 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.translator.tojava;
+
+import java.io.IOException;
+
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangTypeHolder;
+import org.onosproject.yangutils.translator.exception.TranslatorException;
+import org.onosproject.yangutils.translator.tojava.utils.YangPluginConfig;
+
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.GENERATE_ENUM_CLASS;
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.GENERATE_INTERFACE_WITH_BUILDER;
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.GENERATE_SERVICE_AND_MANAGER;
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.GENERATE_TYPE_CLASS;
+
+/**
+ * Represents implementation of java code fragments temporary implementations.
+ * Contains fragment file object of different types of java file.
+ * Uses required object(s) to generate the target java file(s).
+ */
+public class TempJavaCodeFragmentFiles {
+
+    /**
+     * Has the temporary files required for bean generated classes.
+     */
+    private TempJavaBeanFragmentFiles beanTempFiles;
+
+    /**
+     * Has the temporary files required for bean generated classes.
+     */
+    private TempJavaTypeFragmentFiles typeTempFiles;
+
+    /**
+     * Has the temporary files required for service generated classes.
+     */
+    private TempJavaServiceFragmentFiles serviceTempFiles;
+
+    /**
+     * Has the temporary files required for enumeration generated classes.
+     */
+    private TempJavaEnumerationFragmentFiles enumerationTempFiles;
+
+    /**
+     * Creates an instance of temporary java code fragment.
+     *
+     * @param javaFileInfo generated java file info
+     * @throws IOException when fails to create new file handle
+     */
+    public TempJavaCodeFragmentFiles(JavaFileInfo javaFileInfo)
+            throws IOException {
+
+        if ((javaFileInfo.getGeneratedFileTypes() & GENERATE_INTERFACE_WITH_BUILDER) != 0) {
+            setBeanTempFiles(new TempJavaBeanFragmentFiles(javaFileInfo));
+        }
+
+        if ((javaFileInfo.getGeneratedFileTypes() & GENERATE_TYPE_CLASS) != 0) {
+            setTypeTempFiles(new TempJavaTypeFragmentFiles(javaFileInfo));
+        }
+
+        if ((javaFileInfo.getGeneratedFileTypes() & GENERATE_ENUM_CLASS) != 0) {
+            setEnumerationTempFiles(new TempJavaEnumerationFragmentFiles(javaFileInfo));
+        }
+
+        if ((javaFileInfo.getGeneratedFileTypes() & GENERATE_SERVICE_AND_MANAGER) != 0) {
+            setServiceTempFiles(new TempJavaServiceFragmentFiles(javaFileInfo));
+        }
+
+    }
+
+    /**
+     * Retrieves the temp file handle for bean file generation.
+     *
+     * @return temp file handle for bean file generation
+     */
+    public TempJavaBeanFragmentFiles getBeanTempFiles() {
+        return beanTempFiles;
+    }
+
+    /**
+     * Sets temp file handle for bean file generation.
+     *
+     * @param beanTempFiles temp file handle for bean file generation
+     */
+    public void setBeanTempFiles(TempJavaBeanFragmentFiles beanTempFiles) {
+        this.beanTempFiles = beanTempFiles;
+    }
+
+    /**
+     * Retrieves the temp file handle for data type file generation.
+     *
+     * @return temp file handle for data type file generation
+     */
+    public TempJavaTypeFragmentFiles getTypeTempFiles() {
+        return typeTempFiles;
+    }
+
+    /**
+     * Sets temp file handle for data type file generation.
+     *
+     * @param typeTempFiles temp file handle for data type file generation
+     */
+    public void setTypeTempFiles(TempJavaTypeFragmentFiles typeTempFiles) {
+        this.typeTempFiles = typeTempFiles;
+    }
+
+    /**
+     * Retrieves the temp file handle for service file generation.
+     *
+     * @return temp file handle for service file generation
+     */
+    public TempJavaServiceFragmentFiles getServiceTempFiles() {
+        return serviceTempFiles;
+    }
+
+    /**
+     * Sets temp file handle for service file generation.
+     *
+     * @param serviceTempFiles temp file handle for service file generation
+     */
+    public void setServiceTempFiles(TempJavaServiceFragmentFiles serviceTempFiles) {
+        this.serviceTempFiles = serviceTempFiles;
+    }
+
+    /**
+     * Retrieves the temp file handle for enumeration file generation.
+     *
+     * @return temp file handle for enumeration file generation
+     */
+    public TempJavaEnumerationFragmentFiles getEnumerationTempFiles() {
+        return enumerationTempFiles;
+    }
+
+    /**
+     * Sets temp file handle for enumeration file generation.
+     *
+     * @param enumerationTempFiles temp file handle for enumeration file generation
+     */
+    public void setEnumerationTempFiles(
+            TempJavaEnumerationFragmentFiles enumerationTempFiles) {
+        this.enumerationTempFiles = enumerationTempFiles;
+    }
+
+    /**
+     * Constructs java code exit.
+     *
+     * @param fileType generated file type
+     * @param curNode current YANG node
+     * @throws IOException when fails to generate java files
+     */
+    public void generateJavaFile(int fileType, YangNode curNode)
+            throws IOException {
+
+        if ((fileType & GENERATE_INTERFACE_WITH_BUILDER) != 0) {
+            getBeanTempFiles().generateJavaFile(fileType, curNode);
+        }
+
+        /*
+         * Creates user defined data type class file.
+         */
+        if ((fileType & GENERATE_TYPE_CLASS) != 0) {
+            getTypeTempFiles().generateJavaFile(fileType, curNode);
+        }
+
+        /*
+         * Creates service and manager class file.
+         */
+        if (fileType == GENERATE_SERVICE_AND_MANAGER) {
+            getServiceTempFiles().generateJavaFile(GENERATE_SERVICE_AND_MANAGER, curNode);
+        }
+
+        /*
+         * Creats enumeration class file.
+         */
+        if (fileType == GENERATE_ENUM_CLASS) {
+            getEnumerationTempFiles().generateJavaFile(GENERATE_ENUM_CLASS, curNode);
+        }
+
+        freeTemporaryResources(false);
+    }
+
+    /**
+     * Adds the new attribute info to the target generated temporary files.
+     *
+     * @param newAttrInfo the attribute info that needs to be added to temporary
+     * files
+     * @param pluginConfig plugin configurations
+     * @throws IOException IO operation fail
+     */
+    public void addJavaSnippetInfoToApplicableTempFiles(JavaAttributeInfo newAttrInfo,
+            YangPluginConfig pluginConfig)
+            throws IOException {
+
+        if (getBeanTempFiles() != null) {
+            getBeanTempFiles()
+                    .addJavaSnippetInfoToApplicableTempFiles(newAttrInfo, pluginConfig);
+        }
+
+        /**
+         * Creates user defined data type class file.
+         */
+        if (getTypeTempFiles() != null) {
+            getTypeTempFiles()
+                    .addJavaSnippetInfoToApplicableTempFiles(newAttrInfo, pluginConfig);
+        }
+    }
+
+    /**
+     * Add all the type in the current data model node as part of the
+     * generated temporary file.
+     *
+     * @param yangTypeHolder YANG java data model node which has type info, eg union / typedef
+     * @param pluginConfig plugin configurations for naming convention
+     * @throws IOException IO operation fail
+     */
+    public void addTypeInfoToTempFiles(YangTypeHolder yangTypeHolder, YangPluginConfig pluginConfig)
+            throws IOException {
+        getTypeTempFiles()
+                .addTypeInfoToTempFiles(yangTypeHolder, pluginConfig);
+    }
+
+    /**
+     * Adds build method for interface.
+     *
+     * @param pluginConfig plugin configurations
+     * @return build method for interface
+     * @throws IOException when fails to append to temporary file
+     */
+    public String addBuildMethodForInterface(YangPluginConfig pluginConfig)
+            throws IOException {
+        if (getBeanTempFiles() != null) {
+            return getBeanTempFiles().addBuildMethodForInterface(pluginConfig);
+        }
+        throw new TranslatorException("build method only supported for bean class");
+    }
+
+    /**
+     * Adds default constructor for class.
+     *
+     * @param modifier modifier for constructor.
+     * @param toAppend string which need to be appended with the class name
+     * @param pluginConfig plugin configurations
+     * @return default constructor for class
+     * @throws IOException when fails to append to file
+     */
+    public String addDefaultConstructor(String modifier, String toAppend, YangPluginConfig pluginConfig)
+            throws IOException {
+        if (getTypeTempFiles() != null) {
+            return getTypeTempFiles()
+                    .addDefaultConstructor(modifier, toAppend, pluginConfig);
+        }
+
+        if (getBeanTempFiles() != null) {
+            return getBeanTempFiles().addDefaultConstructor(modifier, toAppend, pluginConfig);
+        }
+
+        throw new TranslatorException("default constructor should not be added");
+    }
+
+    /**
+     * Adds build method's implementation for class.
+     *
+     * @return build method implementation for class
+     * @throws IOException when fails to append to temporary file
+     */
+    public String addBuildMethodImpl()
+            throws IOException {
+        if (getBeanTempFiles() != null) {
+            return getBeanTempFiles().addBuildMethodImpl();
+        }
+
+        throw new TranslatorException("build should not be added");
+    }
+
+    /**
+     * Removes all temporary file handles.
+     *
+     * @param isErrorOccurred when translator fails to generate java files we need to close
+     * all open file handles include temporary files and java files.
+     * @throws IOException when failed to delete the temporary files
+     */
+    public void freeTemporaryResources(boolean isErrorOccurred)
+            throws IOException {
+
+        if (getBeanTempFiles() != null) {
+            getBeanTempFiles().freeTemporaryResources(isErrorOccurred);
+        }
+
+        if (getTypeTempFiles() != null) {
+            getTypeTempFiles().freeTemporaryResources(isErrorOccurred);
+        }
+
+        if (getEnumerationTempFiles() != null) {
+            getEnumerationTempFiles().freeTemporaryResources(isErrorOccurred);
+        }
+
+        if (getServiceTempFiles() != null) {
+            getServiceTempFiles().freeTemporaryResources(isErrorOccurred);
+        }
+
+    }
+
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/TempJavaCodeFragmentFilesContainer.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/TempJavaCodeFragmentFilesContainer.java
new file mode 100644
index 0000000..1bbf349
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/TempJavaCodeFragmentFilesContainer.java
@@ -0,0 +1,36 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.yangutils.translator.tojava;
+
+/**
+ * Represents Has temporary file handle.
+ */
+public interface TempJavaCodeFragmentFilesContainer {
+
+    /**
+     * Returns the temporary file handle.
+     *
+     * @return temporary file handle
+     */
+    TempJavaCodeFragmentFiles getTempJavaCodeFragmentFiles();
+
+    /**
+     * Sets temporary file handle.
+     *
+     * @param fileHandle temporary file handle
+     */
+    void setTempJavaCodeFragmentFiles(TempJavaCodeFragmentFiles fileHandle);
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/TempJavaEnumerationFragmentFiles.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/TempJavaEnumerationFragmentFiles.java
new file mode 100644
index 0000000..2ab6f9d
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/TempJavaEnumerationFragmentFiles.java
@@ -0,0 +1,316 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.yangutils.translator.tojava;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import org.onosproject.yangutils.datamodel.YangDataTypes;
+import org.onosproject.yangutils.datamodel.YangEnum;
+import org.onosproject.yangutils.datamodel.YangEnumeration;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.translator.exception.TranslatorException;
+import org.onosproject.yangutils.translator.tojava.javamodel.YangJavaType;
+import org.onosproject.yangutils.translator.tojava.utils.YangPluginConfig;
+
+import static org.onosproject.yangutils.translator.tojava.GeneratedTempFileType.ENUM_IMPL_MASK;
+import static org.onosproject.yangutils.translator.tojava.JavaAttributeInfo.getAttributeInfoForTheData;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaCodeSnippetGen.generateEnumAttributeString;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaFileGenerator.generateEnumClassFile;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaIdentifierSyntax.getEnumJavaAttribute;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaIdentifierSyntax.getPrefixForIdentifier;
+import static org.onosproject.yangutils.translator.tojava.utils.TempJavaCodeFragmentFilesUtils.closeFile;
+import static org.onosproject.yangutils.utils.UtilConstants.EMPTY_STRING;
+import static org.onosproject.yangutils.utils.UtilConstants.REGEX_FOR_FIRST_DIGIT;
+import static org.onosproject.yangutils.utils.UtilConstants.YANG_AUTO_PREFIX;
+import static org.onosproject.yangutils.utils.io.impl.FileSystemUtil.createPackage;
+
+/**
+ * Represents implementation of java code fragments temporary implementations.
+ * Maintains the temp files required specific for enumeration java snippet generation.
+ */
+public class TempJavaEnumerationFragmentFiles extends TempJavaFragmentFiles {
+
+    /**
+     * File name for temporary enum class.
+     */
+    private static final String ENUM_CLASS_TEMP_FILE_NAME = "EnumClass";
+
+    /**
+     * File name for enum class file name suffix.
+     */
+    private static final String ENUM_CLASS_FILE_NAME_SUFFIX = EMPTY_STRING;
+
+    /**
+     * Current enum's value.
+     */
+    private int enumValue;
+
+    /**
+     * Contains data of enumSet.
+     */
+    private Map<String, Integer> enumStringMap = new HashMap<>();
+
+    /**
+     * Contains data of enumSet.
+     */
+    private List<String> enumStringList;
+
+    /**
+     * Temporary file handle for enum class file.
+     */
+    private File enumClassTempFileHandle;
+
+    /**
+     * Java file handle for enum class.
+     */
+    private File enumClassJavaFileHandle;
+
+    /**
+     * Creates an instance of temporary java code fragment.
+     *
+     * @param javaFileInfo generated java file info
+     * @throws IOException when fails to create new file handle
+     */
+    public TempJavaEnumerationFragmentFiles(JavaFileInfo javaFileInfo)
+            throws IOException {
+
+        super(javaFileInfo);
+        setEnumSetJavaMap(new HashMap<>());
+        setEnumStringList(new ArrayList<>());
+        /*
+         * Initialize enum when generation file type matches to enum class mask.
+         */
+        addGeneratedTempFile(ENUM_IMPL_MASK);
+        setEnumClassTempFileHandle(getTemporaryFileHandle(ENUM_CLASS_TEMP_FILE_NAME));
+    }
+
+    /**
+     * Returns enum class java file handle.
+     *
+     * @return enum class java file handle
+     */
+    public File getEnumClassJavaFileHandle() {
+        return enumClassJavaFileHandle;
+    }
+
+    /**
+     * Sets enum class java file handle.
+     *
+     * @param enumClassJavaFileHandle enum class java file handle
+     */
+    private void setEnumClassJavaFileHandle(File enumClassJavaFileHandle) {
+        this.enumClassJavaFileHandle = enumClassJavaFileHandle;
+    }
+
+    /**
+     * Returns enum's value.
+     *
+     * @return enum's value
+     */
+    private int getEnumValue() {
+        return enumValue;
+    }
+
+    /**
+     * Sets enum's value.
+     *
+     * @param enumValue enum's value
+     */
+    private void setEnumValue(int enumValue) {
+        this.enumValue = enumValue;
+    }
+
+    /**
+     * Returns enum set java map.
+     *
+     * @return the enum set java map
+     */
+    public Map<String, Integer> getEnumSetJavaMap() {
+        return enumStringMap;
+    }
+
+    /**
+     * Sets enum set java map.
+     *
+     * @param map the enum set java map to set
+     */
+    private void setEnumSetJavaMap(Map<String, Integer> map) {
+        this.enumStringMap = map;
+    }
+
+    /**
+     * Returns temporary file handle for enum class file.
+     *
+     * @return temporary file handle for enum class file
+     */
+    public File getEnumClassTempFileHandle() {
+        return enumClassTempFileHandle;
+    }
+
+    /**
+     * Sets temporary file handle for enum class file.
+     *
+     * @param enumClassTempFileHandle temporary file handle for enum class file
+     */
+    private void setEnumClassTempFileHandle(File enumClassTempFileHandle) {
+        this.enumClassTempFileHandle = enumClassTempFileHandle;
+    }
+
+    /**
+     * Adds enum class attributes to temporary file.
+     *
+     * @param curEnumName current YANG enum
+     * @throws IOException when fails to do IO operations.
+     */
+    private void addAttributesForEnumClass(String curEnumName, YangPluginConfig pluginConfig) throws IOException {
+        appendToFile(getEnumClassTempFileHandle(),
+                generateEnumAttributeString(curEnumName, getEnumValue(), pluginConfig));
+    }
+
+    /**
+     * Adds enum attributes to temporary files.
+     *
+     * @param curNode current YANG node
+     * @param pluginConfig plugin configurations
+     * @throws IOException when fails to do IO operations
+     */
+    public void addEnumAttributeToTempFiles(YangNode curNode, YangPluginConfig pluginConfig) throws IOException {
+
+        super.addJavaSnippetInfoToApplicableTempFiles(getJavaAttributeForEnum(pluginConfig), pluginConfig);
+        if (curNode instanceof YangEnumeration) {
+            YangEnumeration enumeration = (YangEnumeration) curNode;
+            for (YangEnum curEnum : enumeration.getEnumSet()) {
+                String enumName = curEnum.getNamedValue();
+                String prefixForIdentifier = null;
+                if (enumName.matches(REGEX_FOR_FIRST_DIGIT)) {
+                    prefixForIdentifier = getPrefixForIdentifier(pluginConfig.getConflictResolver());
+                    if (prefixForIdentifier != null) {
+                        curEnum.setNamedValue(prefixForIdentifier + enumName);
+                    } else {
+                        curEnum.setNamedValue(YANG_AUTO_PREFIX + enumName);
+                    }
+                }
+                setEnumValue(curEnum.getValue());
+                addToEnumStringList(curEnum.getNamedValue());
+                addToEnumSetJavaMap(curEnum.getNamedValue(), curEnum.getValue());
+                addJavaSnippetInfoToApplicableTempFiles(curEnum.getNamedValue(), pluginConfig);
+            }
+        } else {
+            throw new TranslatorException("current node should be of enumeration type.");
+        }
+    }
+
+    /**
+    * Returns java attribute for enum class.
+    *
+    * @param pluginConfig plugin configurations
+    * @return java attribute
+    */
+    public JavaAttributeInfo getJavaAttributeForEnum(YangPluginConfig pluginConfig) {
+        YangJavaType<?> javaType = new YangJavaType<>();
+        javaType.setDataType(YangDataTypes.INT32);
+        javaType.setDataTypeName("int");
+        javaType.updateJavaQualifiedInfo(pluginConfig.getConflictResolver());
+        return getAttributeInfoForTheData(
+                javaType.getJavaQualifiedInfo(),
+                javaType.getDataTypeName(), javaType,
+                getIsQualifiedAccessOrAddToImportList(javaType.getJavaQualifiedInfo()),
+                false);
+    }
+
+    /**
+     * Adds current enum name to java list.
+     *
+     * @param curEnumName current enum name
+     */
+    private void addToEnumSetJavaMap(String curEnumName, int value) {
+        getEnumSetJavaMap().put(getEnumJavaAttribute(curEnumName).toUpperCase(), value);
+    }
+
+    /**
+     * Adds the new attribute info to the target generated temporary files.
+     *
+     * @param curEnumName the attribute name that needs to be added to temporary
+     * files
+     * @throws IOException IO operation fail
+     */
+    void addJavaSnippetInfoToApplicableTempFiles(String curEnumName, YangPluginConfig pluginConfig)
+            throws IOException {
+        addAttributesForEnumClass(getEnumJavaAttribute(curEnumName), pluginConfig);
+    }
+
+    /**
+     * Constructs java code exit.
+     *
+     * @param fileType generated file type
+     * @param curNode current YANG node
+     * @throws IOException when fails to generate java files
+     */
+    @Override
+    public void generateJavaFile(int fileType, YangNode curNode) throws IOException {
+        createPackage(curNode);
+        setEnumClassJavaFileHandle(getJavaFileHandle(getJavaClassName(ENUM_CLASS_FILE_NAME_SUFFIX)));
+        setEnumClassJavaFileHandle(generateEnumClassFile(getEnumClassJavaFileHandle(), curNode));
+        freeTemporaryResources(false);
+    }
+
+    /**
+     * Removes all temporary file handles.
+     *
+     * @param isErrorOccurred when translator fails to generate java files we
+     * need to close all open file handles include temporary files
+     * and java files.
+     * @throws IOException when failed to delete the temporary files
+     */
+    @Override
+    public void freeTemporaryResources(boolean isErrorOccurred) throws IOException {
+        closeFile(getEnumClassJavaFileHandle(), isErrorOccurred);
+        closeFile(getEnumClassTempFileHandle(), true);
+        super.freeTemporaryResources(isErrorOccurred);
+    }
+
+    /**
+     * Adds  to enum string list.
+     *
+     * @param curEnumValue current enum value
+     */
+    private void addToEnumStringList(String curEnumValue) {
+        getEnumStringList().add(getEnumJavaAttribute(curEnumValue).toUpperCase());
+    }
+
+    /**
+     * Returns enum string list.
+     *
+     * @return the enumStringList
+     */
+    public List<String> getEnumStringList() {
+        return enumStringList;
+    }
+
+    /**
+     * Sets enum string list.
+     *
+     * @param enumStringList the enumStringList to set
+     */
+    public void setEnumStringList(List<String> enumStringList) {
+        this.enumStringList = enumStringList;
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/TempJavaFragmentFiles.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/TempJavaFragmentFiles.java
new file mode 100644
index 0000000..3c35a71
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/TempJavaFragmentFiles.java
@@ -0,0 +1,1663 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.yangutils.translator.tojava;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
+import org.onosproject.yangutils.datamodel.RpcNotificationContainer;
+import org.onosproject.yangutils.datamodel.YangCase;
+import org.onosproject.yangutils.datamodel.YangLeaf;
+import org.onosproject.yangutils.datamodel.YangLeafList;
+import org.onosproject.yangutils.datamodel.YangLeavesHolder;
+import org.onosproject.yangutils.datamodel.YangList;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.translator.exception.TranslatorException;
+import org.onosproject.yangutils.translator.tojava.javamodel.JavaLeafInfoContainer;
+import org.onosproject.yangutils.translator.tojava.javamodel.YangJavaGrouping;
+import org.onosproject.yangutils.translator.tojava.javamodel.YangJavaModule;
+import org.onosproject.yangutils.translator.tojava.javamodel.YangJavaSubModule;
+import org.onosproject.yangutils.translator.tojava.utils.JavaExtendsListHolder;
+import org.onosproject.yangutils.translator.tojava.utils.YangPluginConfig;
+
+import static org.onosproject.yangutils.datamodel.utils.DataModelUtils.getParentNodeInGenCode;
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.BUILDER_CLASS_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.BUILDER_INTERFACE_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.GENERATE_ENUM_CLASS;
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.GENERATE_SERVICE_AND_MANAGER;
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.GENERATE_TYPE_CLASS;
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.IMPL_CLASS_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.INTERFACE_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedTempFileType.ATTRIBUTES_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedTempFileType.EQUALS_IMPL_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedTempFileType.FROM_STRING_IMPL_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedTempFileType.GETTER_FOR_CLASS_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedTempFileType.GETTER_FOR_INTERFACE_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedTempFileType.HASH_CODE_IMPL_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedTempFileType.SETTER_FOR_CLASS_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedTempFileType.SETTER_FOR_INTERFACE_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedTempFileType.TO_STRING_IMPL_MASK;
+import static org.onosproject.yangutils.translator.tojava.JavaAttributeInfo.getAttributeInfoForTheData;
+import static org.onosproject.yangutils.translator.tojava.JavaQualifiedTypeInfo.getQualifiedInfoOfFromString;
+import static org.onosproject.yangutils.translator.tojava.JavaQualifiedTypeInfo.getQualifiedTypeInfoOfCurNode;
+import static org.onosproject.yangutils.translator.tojava.utils.AttributesJavaDataType.updateJavaFileInfo;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaCodeSnippetGen.getJavaAttributeDefination;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaCodeSnippetGen.getJavaClassDefClose;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaFileGenerator.generateBuilderClassFile;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaFileGenerator.generateBuilderInterfaceFile;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaFileGenerator.generateImplClassFile;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaFileGenerator.generateInterfaceFile;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaFileGeneratorUtils.getFileObject;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaIdentifierSyntax.getCamelCase;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaIdentifierSyntax.getCapitalCase;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaIdentifierSyntax.getPackageDirPathFromJavaJPackage;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaIdentifierSyntax.getRootPackage;
+import static org.onosproject.yangutils.translator.tojava.utils.MethodsGenerator.getBuildString;
+import static org.onosproject.yangutils.translator.tojava.utils.MethodsGenerator.getDefaultConstructorString;
+import static org.onosproject.yangutils.translator.tojava.utils.MethodsGenerator.getEqualsMethod;
+import static org.onosproject.yangutils.translator.tojava.utils.MethodsGenerator.getFromStringMethod;
+import static org.onosproject.yangutils.translator.tojava.utils.MethodsGenerator.getGetterForClass;
+import static org.onosproject.yangutils.translator.tojava.utils.MethodsGenerator.getGetterString;
+import static org.onosproject.yangutils.translator.tojava.utils.MethodsGenerator.getHashCodeMethod;
+import static org.onosproject.yangutils.translator.tojava.utils.MethodsGenerator.getOfMethod;
+import static org.onosproject.yangutils.translator.tojava.utils.MethodsGenerator.getOverRideString;
+import static org.onosproject.yangutils.translator.tojava.utils.MethodsGenerator.getSetterForClass;
+import static org.onosproject.yangutils.translator.tojava.utils.MethodsGenerator.getSetterString;
+import static org.onosproject.yangutils.translator.tojava.utils.MethodsGenerator.getToStringMethod;
+import static org.onosproject.yangutils.translator.tojava.utils.MethodsGenerator.parseBuilderInterfaceBuildMethodString;
+import static org.onosproject.yangutils.translator.tojava.utils.TempJavaCodeFragmentFilesUtils.addArrayListImport;
+import static org.onosproject.yangutils.translator.tojava.utils.TempJavaCodeFragmentFilesUtils.addAugmentationHoldersImport;
+import static org.onosproject.yangutils.translator.tojava.utils.TempJavaCodeFragmentFilesUtils.addAugmentedInfoImport;
+import static org.onosproject.yangutils.translator.tojava.utils.TempJavaCodeFragmentFilesUtils.closeFile;
+import static org.onosproject.yangutils.translator.tojava.utils.TempJavaCodeFragmentFilesUtils.isAugmentationHolderExtended;
+import static org.onosproject.yangutils.translator.tojava.utils.TempJavaCodeFragmentFilesUtils.isAugmentedInfoExtended;
+import static org.onosproject.yangutils.translator.tojava.utils.TempJavaCodeFragmentFilesUtils.sortImports;
+import static org.onosproject.yangutils.utils.UtilConstants.ACTIVATE;
+import static org.onosproject.yangutils.utils.UtilConstants.BUILDER;
+import static org.onosproject.yangutils.utils.UtilConstants.COMPONENT;
+import static org.onosproject.yangutils.utils.UtilConstants.DEACTIVATE;
+import static org.onosproject.yangutils.utils.UtilConstants.EMPTY_STRING;
+import static org.onosproject.yangutils.utils.UtilConstants.FOUR_SPACE_INDENTATION;
+import static org.onosproject.yangutils.utils.UtilConstants.IMPL;
+import static org.onosproject.yangutils.utils.UtilConstants.IMPORT;
+import static org.onosproject.yangutils.utils.UtilConstants.INTERFACE;
+import static org.onosproject.yangutils.utils.UtilConstants.MANAGER;
+import static org.onosproject.yangutils.utils.UtilConstants.NEW_LINE;
+import static org.onosproject.yangutils.utils.UtilConstants.PERIOD;
+import static org.onosproject.yangutils.utils.UtilConstants.REFERENCE;
+import static org.onosproject.yangutils.utils.UtilConstants.REFERENCE_CARDINALITY;
+import static org.onosproject.yangutils.utils.UtilConstants.SEMI_COLAN;
+import static org.onosproject.yangutils.utils.UtilConstants.SERVICE;
+import static org.onosproject.yangutils.utils.UtilConstants.SLASH;
+import static org.onosproject.yangutils.utils.io.impl.FileSystemUtil.createPackage;
+import static org.onosproject.yangutils.utils.io.impl.FileSystemUtil.readAppendFile;
+import static org.onosproject.yangutils.utils.io.impl.JavaDocGen.getJavaDoc;
+import static org.onosproject.yangutils.utils.io.impl.JavaDocGen.JavaDocType.GETTER_METHOD;
+import static org.onosproject.yangutils.utils.io.impl.JavaDocGen.JavaDocType.OF_METHOD;
+import static org.onosproject.yangutils.utils.io.impl.YangIoUtils.getAbsolutePackagePath;
+import static org.onosproject.yangutils.utils.io.impl.YangIoUtils.insertDataIntoJavaFile;
+import static org.onosproject.yangutils.utils.io.impl.YangIoUtils.mergeJavaFiles;
+import static org.onosproject.yangutils.utils.io.impl.YangIoUtils.validateLineLength;
+
+/**
+ * Represents implementation of java code fragments temporary implementations.
+ * Manages the common temp file required for Java file(s) generated.
+ */
+public class TempJavaFragmentFiles {
+
+    /**
+     * Information about the java files being generated.
+     */
+    private JavaFileInfo javaFileInfo;
+
+    /**
+     * Imported class info.
+     */
+    private JavaImportData javaImportData;
+
+    /**
+     * The variable which guides the types of temporary files generated using
+     * the temporary generated file types mask.
+     */
+    private int generatedTempFiles;
+
+    /**
+     * Absolute path where the target java file needs to be generated.
+     */
+    private String absoluteDirPath;
+
+    /**
+     * Contains all the interface(s)/class name which will be extended by generated files.
+     */
+    private JavaExtendsListHolder javaExtendsListHolder;
+
+    /**
+     * File type extension for java classes.
+     */
+    private static final String JAVA_FILE_EXTENSION = ".java";
+
+    /**
+     * File type extension for temporary classes.
+     */
+    private static final String TEMP_FILE_EXTENSION = ".tmp";
+
+    /**
+     * Folder suffix for temporary files folder.
+     */
+    private static final String TEMP_FOLDER_NAME_SUFIX = "-Temp";
+
+    /**
+     * File name for getter method.
+     */
+    private static final String GETTER_METHOD_FILE_NAME = "GetterMethod";
+
+    /**
+     * File name for setter method.
+     */
+    private static final String SETTER_METHOD_FILE_NAME = "SetterMethod";
+
+    /**
+     * File name for getter method implementation.
+     */
+    private static final String GETTER_METHOD_IMPL_FILE_NAME = "GetterMethodImpl";
+
+    /**
+     * File name for setter method implementation.
+     */
+    private static final String SETTER_METHOD_IMPL_FILE_NAME = "SetterMethodImpl";
+
+    /**
+     * File name for attributes.
+     */
+    private static final String ATTRIBUTE_FILE_NAME = "Attributes";
+
+    /**
+     * File name for to string method.
+     */
+    private static final String TO_STRING_METHOD_FILE_NAME = "ToString";
+
+    /**
+     * File name for hash code method.
+     */
+    private static final String HASH_CODE_METHOD_FILE_NAME = "HashCode";
+
+    /**
+     * File name for equals method.
+     */
+    private static final String EQUALS_METHOD_FILE_NAME = "Equals";
+
+    /**
+     * File name for from string method.
+     */
+    private static final String FROM_STRING_METHOD_FILE_NAME = "FromString";
+
+    /**
+     * File name for interface java file name suffix.
+     */
+    private static final String INTERFACE_FILE_NAME_SUFFIX = EMPTY_STRING;
+
+    /**
+     * File name for builder interface file name suffix.
+     */
+    private static final String BUILDER_INTERFACE_FILE_NAME_SUFFIX = BUILDER + INTERFACE;
+
+    /**
+     * File name for builder class file name suffix.
+     */
+    private static final String BUILDER_CLASS_FILE_NAME_SUFFIX = BUILDER;
+
+    /**
+     * File name for impl class file name suffix.
+     */
+    private static final String IMPL_CLASS_FILE_NAME_SUFFIX = IMPL;
+
+    /**
+     * Java file handle for interface file.
+     */
+    private File interfaceJavaFileHandle;
+
+    /**
+     * Java file handle for builder interface file.
+     */
+    private File builderInterfaceJavaFileHandle;
+
+    /**
+     * Java file handle for builder class file.
+     */
+    private File builderClassJavaFileHandle;
+
+    /**
+     * Java file handle for impl class file.
+     */
+    private File implClassJavaFileHandle;
+
+    /**
+     * Temporary file handle for attribute.
+     */
+    private File attributesTempFileHandle;
+
+    /**
+     * Temporary file handle for getter of interface.
+     */
+    private File getterInterfaceTempFileHandle;
+
+    /**
+     * Temporary file handle for setter of interface.
+     */
+    private File setterInterfaceTempFileHandle;
+
+    /**
+     * Temporary file handle for getter of class.
+     */
+    private File getterImplTempFileHandle;
+
+    /**
+     * Temporary file handle for setter of class.
+     */
+    private File setterImplTempFileHandle;
+
+    /**
+     * Temporary file handle for hash code method of class.
+     */
+    private File hashCodeImplTempFileHandle;
+
+    /**
+     * Temporary file handle for equals method of class.
+     */
+    private File equalsImplTempFileHandle;
+
+    /**
+     * Temporary file handle for to string method of class.
+     */
+    private File toStringImplTempFileHandle;
+
+    /**
+     * Temporary file handle for from string method of class.
+     */
+    private File fromStringImplTempFileHandle;
+
+    /**
+     * Import info for case.
+     */
+    private JavaQualifiedTypeInfo caseImportInfo;
+
+    /**
+     * Is attribute added.
+     */
+    private boolean isAttributePresent;
+
+    /**
+     * Retrieves the absolute path where the file needs to be generated.
+     *
+     * @return absolute path where the file needs to be generated
+     */
+    private String getAbsoluteDirPath() {
+        return absoluteDirPath;
+    }
+
+    /**
+     * Sets absolute path where the file needs to be generated.
+     *
+     * @param absoluteDirPath absolute path where the file needs to be
+     *                        generated.
+     */
+    void setAbsoluteDirPath(String absoluteDirPath) {
+        this.absoluteDirPath = absoluteDirPath;
+    }
+
+    /**
+     * Sets the generated java file information.
+     *
+     * @param javaFileInfo generated java file information
+     */
+    public void setJavaFileInfo(JavaFileInfo javaFileInfo) {
+        this.javaFileInfo = javaFileInfo;
+    }
+
+    /**
+     * Retrieves the generated java file information.
+     *
+     * @return generated java file information
+     */
+    public JavaFileInfo getJavaFileInfo() {
+        return javaFileInfo;
+    }
+
+    /**
+     * Retrieves the generated temp files.
+     *
+     * @return generated temp files
+     */
+    int getGeneratedTempFiles() {
+        return generatedTempFiles;
+    }
+
+    /**
+     * Clears the generated file mask.
+     */
+    void clearGeneratedTempFileMask() {
+        generatedTempFiles = 0;
+    }
+
+    /**
+     * Adds to generated temporary files.
+     *
+     * @param generatedTempFile generated file
+     */
+    void addGeneratedTempFile(int generatedTempFile) {
+        generatedTempFiles |= generatedTempFile;
+        setGeneratedTempFiles(generatedTempFiles);
+    }
+
+    /**
+     * Sets generated file files.
+     *
+     * @param fileType generated file type
+     */
+    void setGeneratedTempFiles(int fileType) {
+        generatedTempFiles = fileType;
+    }
+
+    /**
+     * Retrieves the generated Java files.
+     *
+     * @return generated Java files
+     */
+    int getGeneratedJavaFiles() {
+        return getJavaFileInfo().getGeneratedFileTypes();
+    }
+
+    /**
+     * Retrieves the mapped Java class name.
+     *
+     * @return mapped Java class name
+     */
+    String getGeneratedJavaClassName() {
+        return getCapitalCase(getJavaFileInfo().getJavaName());
+    }
+
+    /**
+     * Retrieves the import data for the generated Java file.
+     *
+     * @return import data for the generated Java file
+     */
+    public JavaImportData getJavaImportData() {
+        return javaImportData;
+    }
+
+    /**
+     * Sets import data for the generated Java file.
+     *
+     * @param javaImportData import data for the generated Java file
+     */
+    void setJavaImportData(JavaImportData javaImportData) {
+        this.javaImportData = javaImportData;
+    }
+
+    /**
+     * Retrieves the status of any attributes added.
+     *
+     * @return status of any attributes added
+     */
+    public boolean isAttributePresent() {
+        return isAttributePresent;
+    }
+
+    /**
+     * Sets status of any attributes added.
+     *
+     * @param attributePresent status of any attributes added
+     */
+    public void setAttributePresent(boolean attributePresent) {
+        isAttributePresent = attributePresent;
+    }
+
+    /**
+     * Returns getter methods's temporary file handle.
+     *
+     * @return temporary file handle
+     */
+    public File getGetterInterfaceTempFileHandle() {
+        return getterInterfaceTempFileHandle;
+    }
+
+    /**
+     * Sets to getter method's temporary file handle.
+     *
+     * @param getterForInterface file handle for to getter method
+     */
+    private void setGetterInterfaceTempFileHandle(File getterForInterface) {
+        getterInterfaceTempFileHandle = getterForInterface;
+    }
+
+    /**
+     * Returns setter method's temporary file handle.
+     *
+     * @return temporary file handle
+     */
+    public File getSetterInterfaceTempFileHandle() {
+        return setterInterfaceTempFileHandle;
+    }
+
+    /**
+     * Sets to setter method's temporary file handle.
+     *
+     * @param setterForInterface file handle for to setter method
+     */
+    private void setSetterInterfaceTempFileHandle(File setterForInterface) {
+        setterInterfaceTempFileHandle = setterForInterface;
+    }
+
+    /**
+     * Returns setter method's impl's temporary file handle.
+     *
+     * @return temporary file handle
+     */
+    public File getSetterImplTempFileHandle() {
+        return setterImplTempFileHandle;
+    }
+
+    /**
+     * Sets to setter method's impl's temporary file handle.
+     *
+     * @param setterImpl file handle for to setter method's implementation class
+     */
+    private void setSetterImplTempFileHandle(File setterImpl) {
+        setterImplTempFileHandle = setterImpl;
+    }
+
+    /**
+     * Returns from string method's temporary file handle.
+     *
+     * @return from string method's temporary file handle
+     */
+    public File getFromStringImplTempFileHandle() {
+        return fromStringImplTempFileHandle;
+    }
+
+    /**
+     * Sets from string method's temporary file handle.
+     *
+     * @param fromStringImplTempFileHandle from string method's temporary file
+     *                                     handle
+     */
+    private void setFromStringImplTempFileHandle(File fromStringImplTempFileHandle) {
+        this.fromStringImplTempFileHandle = fromStringImplTempFileHandle;
+    }
+
+    /**
+     * Creates an instance of temporary java code fragment.
+     *
+     * @param javaFileInfo generated java file information
+     * @throws IOException when fails to create new file handle
+     */
+    TempJavaFragmentFiles(JavaFileInfo javaFileInfo)
+            throws IOException {
+        setJavaExtendsListHolder(new JavaExtendsListHolder());
+        setJavaImportData(new JavaImportData());
+        setJavaFileInfo(javaFileInfo);
+        setAbsoluteDirPath(getAbsolutePackagePath(getJavaFileInfo().getBaseCodeGenPath(),
+                getJavaFileInfo().getPackageFilePath()));
+
+        /*
+         * Initialize getter when generation file type matches to interface
+         * mask.
+         */
+        if ((getGeneratedJavaFiles() & INTERFACE_MASK) != 0) {
+            addGeneratedTempFile(GETTER_FOR_INTERFACE_MASK);
+        }
+
+        /*
+         * Initialize getter and setter when generation file type matches to
+         * builder interface mask.
+         */
+        if ((getGeneratedJavaFiles() & BUILDER_INTERFACE_MASK) != 0) {
+            addGeneratedTempFile(GETTER_FOR_INTERFACE_MASK);
+            addGeneratedTempFile(SETTER_FOR_INTERFACE_MASK);
+        }
+
+        /*
+         * Initialize getterImpl, setterImpl and attributes when generation file
+         * type matches to builder class mask.
+         */
+        if ((getGeneratedJavaFiles() & BUILDER_CLASS_MASK) != 0) {
+            addGeneratedTempFile(ATTRIBUTES_MASK);
+            addGeneratedTempFile(GETTER_FOR_CLASS_MASK);
+            addGeneratedTempFile(SETTER_FOR_CLASS_MASK);
+        }
+
+        /*
+         * Initialize getterImpl, attributes, constructor, hash code, equals and
+         * to strings when generation file type matches to impl class mask.
+         */
+        if ((getGeneratedJavaFiles() & IMPL_CLASS_MASK) != 0) {
+            addGeneratedTempFile(ATTRIBUTES_MASK);
+            addGeneratedTempFile(GETTER_FOR_CLASS_MASK);
+            addGeneratedTempFile(HASH_CODE_IMPL_MASK);
+            addGeneratedTempFile(EQUALS_IMPL_MASK);
+            addGeneratedTempFile(TO_STRING_IMPL_MASK);
+        }
+
+        /*
+         * Initialize temp files to generate type class.
+         */
+        if ((getGeneratedJavaFiles() & GENERATE_TYPE_CLASS) != 0) {
+            addGeneratedTempFile(ATTRIBUTES_MASK);
+            addGeneratedTempFile(GETTER_FOR_CLASS_MASK);
+            addGeneratedTempFile(HASH_CODE_IMPL_MASK);
+            addGeneratedTempFile(EQUALS_IMPL_MASK);
+            addGeneratedTempFile(TO_STRING_IMPL_MASK);
+            addGeneratedTempFile(FROM_STRING_IMPL_MASK);
+        }
+
+        /*
+         * Initialize temp files to generate enum class.
+         */
+        if ((getGeneratedJavaFiles() & GENERATE_ENUM_CLASS) != 0) {
+            addGeneratedTempFile(FROM_STRING_IMPL_MASK);
+        }
+        /*
+         * Initialize getter and setter when generation file type matches to
+         * builder interface mask.
+         */
+        if ((getGeneratedJavaFiles() & GENERATE_SERVICE_AND_MANAGER) != 0) {
+            addGeneratedTempFile(GETTER_FOR_INTERFACE_MASK);
+            addGeneratedTempFile(SETTER_FOR_INTERFACE_MASK);
+            addGeneratedTempFile(GETTER_FOR_CLASS_MASK);
+            addGeneratedTempFile(SETTER_FOR_CLASS_MASK);
+        }
+
+        /*
+         * Set temporary file handles.
+         */
+        if ((getGeneratedTempFiles() & ATTRIBUTES_MASK) != 0) {
+            setAttributesTempFileHandle(getTemporaryFileHandle(ATTRIBUTE_FILE_NAME));
+        }
+
+        if ((getGeneratedTempFiles() & GETTER_FOR_INTERFACE_MASK) != 0) {
+            setGetterInterfaceTempFileHandle(getTemporaryFileHandle(GETTER_METHOD_FILE_NAME));
+        }
+
+        if ((getGeneratedTempFiles() & SETTER_FOR_INTERFACE_MASK) != 0) {
+            setSetterInterfaceTempFileHandle(getTemporaryFileHandle(SETTER_METHOD_FILE_NAME));
+        }
+
+        if ((getGeneratedTempFiles() & GETTER_FOR_CLASS_MASK) != 0) {
+            setGetterImplTempFileHandle(getTemporaryFileHandle(GETTER_METHOD_IMPL_FILE_NAME));
+        }
+
+        if ((getGeneratedTempFiles() & SETTER_FOR_CLASS_MASK) != 0) {
+            setSetterImplTempFileHandle(getTemporaryFileHandle(SETTER_METHOD_IMPL_FILE_NAME));
+        }
+
+        if ((getGeneratedTempFiles() & HASH_CODE_IMPL_MASK) != 0) {
+            setHashCodeImplTempFileHandle(getTemporaryFileHandle(HASH_CODE_METHOD_FILE_NAME));
+        }
+        if ((getGeneratedTempFiles() & EQUALS_IMPL_MASK) != 0) {
+            setEqualsImplTempFileHandle(getTemporaryFileHandle(EQUALS_METHOD_FILE_NAME));
+        }
+        if ((getGeneratedTempFiles() & TO_STRING_IMPL_MASK) != 0) {
+            setToStringImplTempFileHandle(getTemporaryFileHandle(TO_STRING_METHOD_FILE_NAME));
+        }
+        if ((getGeneratedTempFiles() & FROM_STRING_IMPL_MASK) != 0) {
+            setFromStringImplTempFileHandle(getTemporaryFileHandle(FROM_STRING_METHOD_FILE_NAME));
+        }
+
+    }
+
+    /**
+     * Returns java file handle for interface file.
+     *
+     * @return java file handle for interface file
+     */
+    private File getInterfaceJavaFileHandle() {
+        return interfaceJavaFileHandle;
+    }
+
+    /**
+     * Sets the java file handle for interface file.
+     *
+     * @param interfaceJavaFileHandle java file handle
+     */
+    private void setInterfaceJavaFileHandle(File interfaceJavaFileHandle) {
+        this.interfaceJavaFileHandle = interfaceJavaFileHandle;
+    }
+
+    /**
+     * Returns java file handle for builder interface file.
+     *
+     * @return java file handle for builder interface file
+     */
+    private File getBuilderInterfaceJavaFileHandle() {
+        return builderInterfaceJavaFileHandle;
+    }
+
+    /**
+     * Sets the java file handle for builder interface file.
+     *
+     * @param builderInterfaceJavaFileHandle java file handle
+     */
+    private void setBuilderInterfaceJavaFileHandle(File builderInterfaceJavaFileHandle) {
+        this.builderInterfaceJavaFileHandle = builderInterfaceJavaFileHandle;
+    }
+
+    /**
+     * Returns java file handle for builder class file.
+     *
+     * @return java file handle for builder class file
+     */
+    private File getBuilderClassJavaFileHandle() {
+        return builderClassJavaFileHandle;
+    }
+
+    /**
+     * Sets the java file handle for builder class file.
+     *
+     * @param builderClassJavaFileHandle java file handle
+     */
+    private void setBuilderClassJavaFileHandle(File builderClassJavaFileHandle) {
+        this.builderClassJavaFileHandle = builderClassJavaFileHandle;
+    }
+
+    /**
+     * Returns java file handle for impl class file.
+     *
+     * @return java file handle for impl class file
+     */
+    private File getImplClassJavaFileHandle() {
+        return implClassJavaFileHandle;
+    }
+
+    /**
+     * Sets the java file handle for impl class file.
+     *
+     * @param implClassJavaFileHandle java file handle
+     */
+    private void setImplClassJavaFileHandle(File implClassJavaFileHandle) {
+        this.implClassJavaFileHandle = implClassJavaFileHandle;
+    }
+
+    /**
+     * Returns attribute's temporary file handle.
+     *
+     * @return temporary file handle
+     */
+    public File getAttributesTempFileHandle() {
+        return attributesTempFileHandle;
+    }
+
+    /**
+     * Sets attribute's temporary file handle.
+     *
+     * @param attributeForClass file handle for attribute
+     */
+    void setAttributesTempFileHandle(File attributeForClass) {
+        attributesTempFileHandle = attributeForClass;
+    }
+
+    /**
+     * Returns getter method's impl's temporary file handle.
+     *
+     * @return temporary file handle
+     */
+    public File getGetterImplTempFileHandle() {
+        return getterImplTempFileHandle;
+    }
+
+    /**
+     * Sets to getter method's impl's temporary file handle.
+     *
+     * @param getterImpl file handle for to getter method's impl
+     */
+    void setGetterImplTempFileHandle(File getterImpl) {
+        getterImplTempFileHandle = getterImpl;
+    }
+
+    /**
+     * Returns hash code method's temporary file handle.
+     *
+     * @return temporary file handle
+     */
+    public File getHashCodeImplTempFileHandle() {
+        return hashCodeImplTempFileHandle;
+    }
+
+    /**
+     * Sets hash code method's temporary file handle.
+     *
+     * @param hashCodeMethod file handle for hash code method
+     */
+    void setHashCodeImplTempFileHandle(File hashCodeMethod) {
+        hashCodeImplTempFileHandle = hashCodeMethod;
+    }
+
+    /**
+     * Returns equals mehtod's temporary file handle.
+     *
+     * @return temporary file handle
+     */
+    public File getEqualsImplTempFileHandle() {
+        return equalsImplTempFileHandle;
+    }
+
+    /**
+     * Sets equals method's temporary file handle.
+     *
+     * @param equalsMethod file handle for to equals method
+     */
+    void setEqualsImplTempFileHandle(File equalsMethod) {
+        equalsImplTempFileHandle = equalsMethod;
+    }
+
+    /**
+     * Returns to string method's temporary file handle.
+     *
+     * @return temporary file handle
+     */
+    public File getToStringImplTempFileHandle() {
+        return toStringImplTempFileHandle;
+    }
+
+    /**
+     * Sets to string method's temporary file handle.
+     *
+     * @param toStringMethod file handle for to string method
+     */
+    void setToStringImplTempFileHandle(File toStringMethod) {
+        toStringImplTempFileHandle = toStringMethod;
+    }
+
+    /**
+     * Returns java extends list holder.
+     *
+     * @return java extends list holder
+     */
+    public JavaExtendsListHolder getJavaExtendsListHolder() {
+        return javaExtendsListHolder;
+    }
+
+    /**
+     * Sets java extends list holder.
+     *
+     * @param javaExtendsListHolder java extends list holder
+     */
+    public void setJavaExtendsListHolder(JavaExtendsListHolder javaExtendsListHolder) {
+        this.javaExtendsListHolder = javaExtendsListHolder;
+    }
+
+    /**
+     * Adds attribute for class.
+     *
+     * @param attr             attribute info
+     * @param yangPluginConfig plugin configurations
+     * @throws IOException when fails to append to temporary file
+     */
+    private void addAttribute(JavaAttributeInfo attr, YangPluginConfig yangPluginConfig)
+            throws IOException {
+        appendToFile(getAttributesTempFileHandle(), parseAttribute(attr, yangPluginConfig)
+                + FOUR_SPACE_INDENTATION);
+    }
+
+    /**
+     * Adds getter for interface.
+     *
+     * @param attr         attribute info
+     * @param pluginConfig plugin configurations
+     * @throws IOException when fails to append to temporary file
+     */
+    private void addGetterForInterface(JavaAttributeInfo attr, YangPluginConfig pluginConfig)
+            throws IOException {
+        appendToFile(getGetterInterfaceTempFileHandle(),
+                getGetterString(attr, getGeneratedJavaFiles(), pluginConfig) + NEW_LINE);
+    }
+
+    /**
+     * Adds setter for interface.
+     *
+     * @param attr         attribute info
+     * @param pluginConfig plugin configurations
+     * @throws IOException when fails to append to temporary file
+     */
+    private void addSetterForInterface(JavaAttributeInfo attr, YangPluginConfig pluginConfig)
+            throws IOException {
+        appendToFile(getSetterInterfaceTempFileHandle(),
+                getSetterString(attr, getGeneratedJavaClassName(), getGeneratedJavaFiles(), pluginConfig)
+                        + NEW_LINE);
+    }
+
+    /**
+     * Adds setter's implementation for class.
+     *
+     * @param attr attribute info
+     * @throws IOException when fails to append to temporary file
+     */
+    private void addSetterImpl(JavaAttributeInfo attr)
+            throws IOException {
+        appendToFile(getSetterImplTempFileHandle(),
+                getOverRideString() + getSetterForClass(attr, getGeneratedJavaClassName(), getGeneratedJavaFiles())
+                        +
+                        NEW_LINE);
+    }
+
+    /**
+     * Adds getter method's impl for class.
+     *
+     * @param attr         attribute info
+     * @param pluginConfig plugin configurations
+     * @throws IOException when fails to append to temporary file
+     */
+    private void addGetterImpl(JavaAttributeInfo attr, YangPluginConfig pluginConfig)
+            throws IOException {
+        if ((getGeneratedJavaFiles() & BUILDER_CLASS_MASK) != 0
+                || (getGeneratedJavaFiles() & GENERATE_SERVICE_AND_MANAGER) != 0) {
+            appendToFile(getGetterImplTempFileHandle(), getOverRideString() + getGetterForClass(attr,
+                    getGeneratedJavaFiles()) + NEW_LINE);
+        } else {
+            appendToFile(getGetterImplTempFileHandle(),
+                    getJavaDoc(GETTER_METHOD, getCapitalCase(attr.getAttributeName()), false, pluginConfig)
+                            + getGetterForClass(attr, getGeneratedJavaFiles()) + NEW_LINE);
+        }
+    }
+
+    /**
+     * Adds build method for interface.
+     *
+     * @param pluginConfig plugin configurations
+     * @return build method for interface
+     * @throws IOException when fails to append to temporary file
+     */
+    String addBuildMethodForInterface(YangPluginConfig pluginConfig)
+            throws IOException {
+        return parseBuilderInterfaceBuildMethodString(getGeneratedJavaClassName(), pluginConfig);
+    }
+
+    /**
+     * Adds build method's implementation for class.
+     *
+     * @return build method implementation for class
+     * @throws IOException when fails to append to temporary file
+     */
+    String addBuildMethodImpl()
+            throws IOException {
+        return getBuildString(getGeneratedJavaClassName()) + NEW_LINE;
+    }
+
+    /**
+     * Adds default constructor for class.
+     *
+     * @param modifier     modifier for constructor.
+     * @param toAppend     string which need to be appended with the class name
+     * @param pluginConfig plugin configurations
+     * @return default constructor for class
+     * @throws IOException when fails to append to file
+     */
+    String addDefaultConstructor(String modifier, String toAppend, YangPluginConfig pluginConfig)
+            throws IOException {
+        return NEW_LINE
+                + getDefaultConstructorString(getGeneratedJavaClassName() + toAppend, modifier, pluginConfig);
+    }
+
+    /**
+     * Adds default constructor for class.
+     *
+     * @param pluginCnfig plugin configurations
+     * @return default constructor for class
+     * @throws IOException when fails to append to file
+     */
+    public String addOfMethod(YangPluginConfig pluginCnfig)
+            throws IOException {
+        return getJavaDoc(OF_METHOD, getGeneratedJavaClassName(), false, pluginCnfig)
+                + getOfMethod(getGeneratedJavaClassName(), null);
+    }
+
+    /**
+     * Adds hash code method for class.
+     *
+     * @param attr attribute info
+     * @throws IOException when fails to append to temporary file
+     */
+    private void addHashCodeMethod(JavaAttributeInfo attr)
+            throws IOException {
+        appendToFile(getHashCodeImplTempFileHandle(), getHashCodeMethod(attr) + NEW_LINE);
+    }
+
+    /**
+     * Adds equals method for class.
+     *
+     * @param attr attribute info
+     * @throws IOException when fails to append to temporary file
+     */
+    private void addEqualsMethod(JavaAttributeInfo attr)
+            throws IOException {
+        appendToFile(getEqualsImplTempFileHandle(), getEqualsMethod(attr) + NEW_LINE);
+    }
+
+    /**
+     * Adds ToString method for class.
+     *
+     * @param attr attribute info
+     * @throws IOException when fails to append to temporary file
+     */
+    private void addToStringMethod(JavaAttributeInfo attr)
+            throws IOException {
+        appendToFile(getToStringImplTempFileHandle(), getToStringMethod(attr) + NEW_LINE);
+    }
+
+    /**
+     * Adds from string method for union class.
+     *
+     * @param javaAttributeInfo       type attribute info
+     * @param fromStringAttributeInfo from string attribute info
+     * @throws IOException when fails to append to temporary file
+     */
+    private void addFromStringMethod(JavaAttributeInfo javaAttributeInfo,
+            JavaAttributeInfo fromStringAttributeInfo)
+            throws IOException {
+        appendToFile(getFromStringImplTempFileHandle(), getFromStringMethod(javaAttributeInfo,
+                fromStringAttributeInfo) + NEW_LINE);
+    }
+
+    /**
+     * Returns a temporary file handle for the specific file type.
+     *
+     * @param fileName file name
+     * @return temporary file handle
+     * @throws IOException when fails to create new file handle
+     */
+    File getTemporaryFileHandle(String fileName)
+            throws IOException {
+        String path = getTempDirPath();
+        File dir = new File(path);
+        if (!dir.exists()) {
+            dir.mkdirs();
+        }
+        File file = new File(path + fileName + TEMP_FILE_EXTENSION);
+        if (!file.exists()) {
+            file.createNewFile();
+        } else {
+            throw new IOException(fileName + " is reused due to YANG naming");
+        }
+        return file;
+    }
+
+    /**
+     * Returns a temporary file handle for the specific file type.
+     *
+     * @param fileName file name
+     * @return temporary file handle
+     * @throws IOException when fails to create new file handle
+     */
+    File getJavaFileHandle(String fileName)
+            throws IOException {
+        return getFileObject(getDirPath(), fileName, JAVA_FILE_EXTENSION, getJavaFileInfo());
+    }
+
+    /**
+     * Returns data from the temporary files.
+     *
+     * @param file temporary file handle
+     * @return stored data from temporary files
+     * @throws IOException when failed to get data from the given file
+     */
+    public String getTemporaryDataFromFileHandle(File file)
+            throws IOException {
+
+        String path = getTempDirPath();
+        if (new File(path + file.getName()).exists()) {
+            return readAppendFile(path + file.getName(), EMPTY_STRING);
+        } else {
+            throw new IOException("Unable to get data from the given "
+                    + file.getName() + " file for " + getGeneratedJavaClassName() + PERIOD);
+        }
+    }
+
+    /**
+     * Returns temporary directory path.
+     *
+     * @return directory path
+     */
+    String getTempDirPath() {
+        return getPackageDirPathFromJavaJPackage(getAbsoluteDirPath()) + SLASH + getGeneratedJavaClassName()
+                + TEMP_FOLDER_NAME_SUFIX + SLASH;
+    }
+
+    /**
+     * Parses attribute to get the attribute string.
+     *
+     * @param attr         attribute info
+     * @param pluginConfig plugin configurations
+     * @return attribute string
+     */
+    public String parseAttribute(JavaAttributeInfo attr, YangPluginConfig pluginConfig) {
+        /*
+         * TODO: check if this utility needs to be called or move to the caller
+         */
+        String attributeName = getCamelCase(attr.getAttributeName(), pluginConfig.getConflictResolver());
+        if (attr.isQualifiedName()) {
+            return getJavaAttributeDefination(attr.getImportInfo().getPkgInfo(),
+                    attr.getImportInfo().getClassInfo(),
+                    attributeName, attr.isListAttr());
+        } else {
+            return getJavaAttributeDefination(null, attr.getImportInfo().getClassInfo(), attributeName,
+                    attr.isListAttr());
+        }
+    }
+
+    /**
+     * Appends content to temporary file.
+     *
+     * @param file temporary file
+     * @param data data to be appended
+     * @throws IOException when fails to append to file
+     */
+    void appendToFile(File file, String data)
+            throws IOException {
+        try {
+            insertDataIntoJavaFile(file, data);
+        } catch (IOException ex) {
+            throw new IOException("failed to write in temp file.");
+        }
+    }
+
+    /**
+     * Adds current node info as and attribute to the parent generated file.
+     *
+     * @param curNode      current node which needs to be added as an attribute in
+     *                     the parent generated code
+     * @param isList       is list construct
+     * @param pluginConfig plugin configurations
+     * @throws IOException IO operation exception
+     */
+    public static void addCurNodeInfoInParentTempFile(YangNode curNode,
+            boolean isList, YangPluginConfig pluginConfig)
+            throws IOException {
+        YangNode parent = getParentNodeInGenCode(curNode);
+        if (!(parent instanceof JavaCodeGenerator)) {
+            throw new TranslatorException("missing parent node to contain current node info in generated file");
+        }
+
+        if (parent instanceof YangJavaGrouping) {
+            /*
+             * In case of grouping, there is no need to add the information, it
+             * will be taken care in uses
+             */
+            return;
+        }
+
+        JavaAttributeInfo javaAttributeInfo = getCurNodeAsAttributeInTarget(curNode,
+                parent, isList);
+        if (!(parent instanceof TempJavaCodeFragmentFilesContainer)) {
+            throw new TranslatorException("missing parent temp file handle");
+        }
+        getNodesInterfaceFragmentFiles(parent)
+                .addJavaSnippetInfoToApplicableTempFiles(javaAttributeInfo, pluginConfig);
+    }
+
+    /**
+     * Adds current node info as and attribute to the parent generated file.
+     *
+     * @param curNode      current node which needs to be added as an attribute in
+     *                     the parent generated code
+     * @param pluginConfig plugin configurations
+     * @param targetNode   target node to add the attribute
+     * @throws IOException IO operation exception
+     */
+    public static void addCurNodeAsAttributeInTargetTempFile(YangNode curNode,
+            YangPluginConfig pluginConfig, YangNode targetNode)
+            throws IOException {
+
+        if (!(targetNode instanceof JavaCodeGenerator)) {
+            throw new TranslatorException("invalid target node to generated file");
+        }
+
+        if (targetNode instanceof YangJavaGrouping) {
+            /*
+             * In case of grouping, there is no need to add the information, it
+             * will be taken care in uses
+             */
+            return;
+        }
+
+        boolean isList = curNode instanceof YangList;
+
+        JavaAttributeInfo javaAttributeInfo = getCurNodeAsAttributeInTarget(curNode,
+                targetNode, isList);
+        if (!(targetNode instanceof TempJavaCodeFragmentFilesContainer)) {
+            throw new TranslatorException("missing target node's temp file handle");
+        }
+        getNodesInterfaceFragmentFiles(targetNode)
+                .addJavaSnippetInfoToApplicableTempFiles(javaAttributeInfo, pluginConfig);
+    }
+
+    /**
+     * Creates an attribute info object corresponding to a data model node and
+     * return it.
+     *
+     * @param curNode    current data model node for which the java code generation
+     *                   is being handled
+     * @param targetNode target node in which the current node is an attribute
+     * @param isListNode is the current added attribute needs to be a list
+     * @return AttributeInfo attribute details required to add in temporary
+     * files
+     */
+    public static JavaAttributeInfo getCurNodeAsAttributeInTarget(YangNode curNode,
+            YangNode targetNode, boolean isListNode) {
+        String curNodeName = ((JavaFileInfoContainer) curNode).getJavaFileInfo().getJavaName();
+        if (curNodeName == null) {
+            updateJavaFileInfo(curNode, null);
+            curNodeName = ((JavaFileInfoContainer) curNode).getJavaFileInfo().getJavaName();
+        }
+
+        /*
+         * Get the import info corresponding to the attribute for import in
+         * generated java files or qualified access
+         */
+        JavaQualifiedTypeInfo qualifiedTypeInfo = getQualifiedTypeInfoOfCurNode(curNode,
+                getCapitalCase(curNodeName));
+        if (!(targetNode instanceof TempJavaCodeFragmentFilesContainer)) {
+            throw new TranslatorException("Parent node does not have file info");
+        }
+        TempJavaFragmentFiles tempJavaFragmentFiles = getNodesInterfaceFragmentFiles(targetNode);
+        JavaImportData parentImportData = tempJavaFragmentFiles.getJavaImportData();
+        JavaFileInfo fileInfo = ((JavaFileInfoContainer) targetNode).getJavaFileInfo();
+
+        boolean isQualified;
+        if ((targetNode instanceof YangJavaModule || targetNode instanceof YangJavaSubModule)
+                && (qualifiedTypeInfo.getClassInfo().contentEquals(SERVICE)
+                        || qualifiedTypeInfo.getClassInfo().contentEquals(COMPONENT)
+                        || qualifiedTypeInfo.getClassInfo().contentEquals(getCapitalCase(ACTIVATE))
+                        || qualifiedTypeInfo.getClassInfo().contentEquals(getCapitalCase(DEACTIVATE))
+                        || qualifiedTypeInfo.getClassInfo().contentEquals(REFERENCE_CARDINALITY)
+                        || qualifiedTypeInfo.getClassInfo().contentEquals(REFERENCE))
+                || qualifiedTypeInfo.getClassInfo().contentEquals(getCapitalCase(fileInfo.getJavaName() + SERVICE))
+                || qualifiedTypeInfo.getClassInfo().contentEquals(getCapitalCase(fileInfo.getJavaName() + MANAGER))) {
+
+            isQualified = true;
+        } else {
+            String className;
+            if (targetNode instanceof YangJavaModule || targetNode instanceof YangJavaSubModule) {
+                className = getCapitalCase(fileInfo.getJavaName()) + "Service";
+            } else {
+                className = getCapitalCase(fileInfo.getJavaName());
+            }
+
+            isQualified = parentImportData.addImportInfo(qualifiedTypeInfo,
+                    className, fileInfo.getPackage());
+        }
+
+        if (isListNode) {
+            parentImportData.setIfListImported(true);
+        }
+
+        return getAttributeInfoForTheData(qualifiedTypeInfo, curNodeName, null, isQualified, isListNode);
+    }
+
+    /**
+     * Resolves groupings java qualified info.
+     *
+     * @param curNode      grouping node
+     * @param pluginConfig plugin configurations
+     * @return groupings java qualified info
+     */
+    public static JavaQualifiedTypeInfo resolveGroupingsQuailifiedInfo(YangNode curNode,
+            YangPluginConfig pluginConfig) {
+
+        JavaFileInfo groupingFileInfo = ((JavaFileInfoContainer) curNode).getJavaFileInfo();
+        JavaQualifiedTypeInfo qualifiedTypeInfo = new JavaQualifiedTypeInfo();
+        if (groupingFileInfo.getPackage() == null) {
+            List<String> parentNames = new ArrayList<>();
+
+            YangNode tempNode = curNode.getParent();
+            YangNode groupingSuperParent = null;
+            while (tempNode != null) {
+                parentNames.add(tempNode.getName());
+                groupingSuperParent = tempNode;
+                tempNode = tempNode.getParent();
+            }
+
+            String pkg = null;
+            JavaFileInfo parentInfo = ((JavaFileInfoContainer) groupingSuperParent).getJavaFileInfo();
+            if (parentInfo.getPackage() == null) {
+                if (groupingSuperParent instanceof YangJavaModule) {
+                    YangJavaModule module = (YangJavaModule) groupingSuperParent;
+                    String modulePkg = getRootPackage(module.getVersion(), module.getNameSpace().getUri(), module
+                            .getRevision().getRevDate(), pluginConfig.getConflictResolver());
+                    pkg = modulePkg;
+                } else if (groupingSuperParent instanceof YangJavaSubModule) {
+                    YangJavaSubModule submodule = (YangJavaSubModule) groupingSuperParent;
+                    String subModulePkg = getRootPackage(submodule.getVersion(),
+                            submodule.getNameSpaceFromModule(submodule.getBelongsTo()),
+                            submodule.getRevision().getRevDate(), pluginConfig.getConflictResolver());
+                    pkg = subModulePkg;
+                }
+            } else {
+                pkg = parentInfo.getPackage();
+            }
+            for (String name : parentNames) {
+                pkg = pkg + PERIOD + getCamelCase(name, pluginConfig.getConflictResolver());
+            }
+
+            qualifiedTypeInfo.setPkgInfo(pkg.toLowerCase());
+            qualifiedTypeInfo.setClassInfo(
+                    getCapitalCase(getCamelCase(curNode.getName(), pluginConfig.getConflictResolver())));
+            return qualifiedTypeInfo;
+
+        } else {
+            qualifiedTypeInfo.setPkgInfo(groupingFileInfo.getPackage().toLowerCase());
+            qualifiedTypeInfo.setClassInfo(getCapitalCase(groupingFileInfo.getJavaName()));
+            return qualifiedTypeInfo;
+        }
+    }
+
+    /**
+     * Returns interface fragment files for node.
+     *
+     * @param node YANG node
+     * @return interface fragment files for node
+     */
+    public static TempJavaFragmentFiles getNodesInterfaceFragmentFiles(YangNode node) {
+        TempJavaFragmentFiles tempJavaFragmentFiles;
+        if (node instanceof RpcNotificationContainer) {
+            tempJavaFragmentFiles = ((TempJavaCodeFragmentFilesContainer) node)
+                    .getTempJavaCodeFragmentFiles()
+                    .getServiceTempFiles();
+        } else {
+            tempJavaFragmentFiles = ((TempJavaCodeFragmentFilesContainer) node)
+                    .getTempJavaCodeFragmentFiles()
+                    .getBeanTempFiles();
+        }
+        return tempJavaFragmentFiles;
+    }
+
+    /**
+     * Adds parent's info to current node import list.
+     *
+     * @param curNode      current node for which import list needs to be updated
+     * @param pluginConfig plugin configurations
+     */
+    public void addParentInfoInCurNodeTempFile(YangNode curNode, YangPluginConfig pluginConfig) {
+        caseImportInfo = new JavaQualifiedTypeInfo();
+        YangNode parent = getParentNodeInGenCode(curNode);
+        if (!(parent instanceof JavaCodeGenerator)) {
+            throw new TranslatorException("missing parent node to contain current node info in generated file");
+        }
+        if (!(curNode instanceof JavaFileInfoContainer)) {
+            throw new TranslatorException("missing java file information to get the package details "
+                    + "of attribute corresponding to child node");
+        }
+        caseImportInfo.setClassInfo(getCapitalCase(getCamelCase(parent.getName(),
+                pluginConfig.getConflictResolver())));
+        caseImportInfo.setPkgInfo(((JavaFileInfoContainer) parent).getJavaFileInfo().getPackage());
+
+        JavaFileInfo fileInfo = ((JavaFileInfoContainer) curNode).getJavaFileInfo();
+
+        ((TempJavaCodeFragmentFilesContainer) curNode).getTempJavaCodeFragmentFiles()
+                .getBeanTempFiles().getJavaImportData().addImportInfo(caseImportInfo,
+                        getCapitalCase(fileInfo.getJavaName()), fileInfo.getPackage());
+    }
+
+    /**
+     * Adds leaf attributes in generated files.
+     *
+     * @param listOfLeaves     list of YANG leaf
+     * @param yangPluginConfig plugin config
+     * @throws IOException IO operation fail
+     */
+    public void addLeavesInfoToTempFiles(List<YangLeaf> listOfLeaves,
+            YangPluginConfig yangPluginConfig)
+            throws IOException {
+        if (listOfLeaves != null) {
+            for (YangLeaf leaf : listOfLeaves) {
+                if (!(leaf instanceof JavaLeafInfoContainer)) {
+                    throw new TranslatorException("Leaf does not have java information");
+                }
+                JavaLeafInfoContainer javaLeaf = (JavaLeafInfoContainer) leaf;
+                javaLeaf.setConflictResolveConfig(yangPluginConfig.getConflictResolver());
+                javaLeaf.updateJavaQualifiedInfo();
+                JavaAttributeInfo javaAttributeInfo = getAttributeInfoForTheData(
+                        javaLeaf.getJavaQualifiedInfo(),
+                        javaLeaf.getJavaName(yangPluginConfig.getConflictResolver()),
+                        javaLeaf.getDataType(),
+                        getIsQualifiedAccessOrAddToImportList(javaLeaf.getJavaQualifiedInfo()),
+                        false);
+                addJavaSnippetInfoToApplicableTempFiles(javaAttributeInfo, yangPluginConfig);
+            }
+        }
+    }
+
+    /**
+     * Adds leaf list's attributes in generated files.
+     *
+     * @param listOfLeafList   list of YANG leaves
+     * @param yangPluginConfig plugin config
+     * @throws IOException IO operation fail
+     */
+    public void addLeafListInfoToTempFiles(List<YangLeafList> listOfLeafList, YangPluginConfig yangPluginConfig)
+            throws IOException {
+        if (listOfLeafList != null) {
+            for (YangLeafList leafList : listOfLeafList) {
+                if (!(leafList instanceof JavaLeafInfoContainer)) {
+                    throw new TranslatorException("Leaf-list does not have java information");
+                }
+                JavaLeafInfoContainer javaLeaf = (JavaLeafInfoContainer) leafList;
+                javaLeaf.setConflictResolveConfig(yangPluginConfig.getConflictResolver());
+                javaLeaf.updateJavaQualifiedInfo();
+                getJavaImportData().setIfListImported(true);
+                JavaAttributeInfo javaAttributeInfo = getAttributeInfoForTheData(
+                        javaLeaf.getJavaQualifiedInfo(),
+                        javaLeaf.getJavaName(yangPluginConfig.getConflictResolver()),
+                        javaLeaf.getDataType(),
+                        getIsQualifiedAccessOrAddToImportList(javaLeaf.getJavaQualifiedInfo()),
+                        true);
+                addJavaSnippetInfoToApplicableTempFiles(javaAttributeInfo, yangPluginConfig);
+            }
+        }
+    }
+
+    /**
+     * Adds all the leaves in the current data model node as part of the
+     * generated temporary file.
+     *
+     * @param curNode          java file info of the generated file
+     * @param yangPluginConfig plugin config
+     * @throws IOException IO operation fail
+     */
+    public void addCurNodeLeavesInfoToTempFiles(YangNode curNode,
+            YangPluginConfig yangPluginConfig)
+            throws IOException {
+        if (!(curNode instanceof YangLeavesHolder)) {
+            throw new TranslatorException("Data model node does not have any leaves");
+        }
+        YangLeavesHolder leavesHolder = (YangLeavesHolder) curNode;
+        addLeavesInfoToTempFiles(leavesHolder.getListOfLeaf(), yangPluginConfig);
+        addLeafListInfoToTempFiles(leavesHolder.getListOfLeafList(), yangPluginConfig);
+    }
+
+    /**
+     * Adds the new attribute info to the target generated temporary files.
+     *
+     * @param newAttrInfo  the attribute info that needs to be added to temporary
+     *                     files
+     * @param pluginConfig plugin configurations
+     * @throws IOException IO operation fail
+     */
+    void addJavaSnippetInfoToApplicableTempFiles(JavaAttributeInfo newAttrInfo, YangPluginConfig pluginConfig)
+            throws IOException {
+        setAttributePresent(true);
+        if ((getGeneratedTempFiles() & ATTRIBUTES_MASK) != 0) {
+            addAttribute(newAttrInfo, pluginConfig);
+        }
+
+        if ((getGeneratedTempFiles() & GETTER_FOR_INTERFACE_MASK) != 0) {
+            addGetterForInterface(newAttrInfo, pluginConfig);
+        }
+
+        if ((getGeneratedTempFiles() & SETTER_FOR_INTERFACE_MASK) != 0) {
+            addSetterForInterface(newAttrInfo, pluginConfig);
+        }
+
+        if ((getGeneratedTempFiles() & SETTER_FOR_CLASS_MASK) != 0) {
+            addSetterImpl(newAttrInfo);
+        }
+
+        if ((getGeneratedTempFiles() & GETTER_FOR_CLASS_MASK) != 0) {
+            addGetterImpl(newAttrInfo, pluginConfig);
+        }
+        if ((getGeneratedTempFiles() & HASH_CODE_IMPL_MASK) != 0) {
+            addHashCodeMethod(newAttrInfo);
+        }
+        if ((getGeneratedTempFiles() & EQUALS_IMPL_MASK) != 0) {
+            addEqualsMethod(newAttrInfo);
+        }
+        if ((getGeneratedTempFiles() & TO_STRING_IMPL_MASK) != 0) {
+            addToStringMethod(newAttrInfo);
+        }
+
+        if ((getGeneratedTempFiles() & FROM_STRING_IMPL_MASK) != 0) {
+            JavaQualifiedTypeInfo qualifiedInfoOfFromString = getQualifiedInfoOfFromString(newAttrInfo,
+                    pluginConfig.getConflictResolver());
+            /*
+             * Create a new java attribute info with qualified information of
+             * wrapper classes.
+             */
+            JavaAttributeInfo fromStringAttributeInfo = getAttributeInfoForTheData(qualifiedInfoOfFromString,
+                    newAttrInfo.getAttributeName(),
+                    newAttrInfo.getAttributeType(),
+                    getIsQualifiedAccessOrAddToImportList(qualifiedInfoOfFromString), false);
+
+            addFromStringMethod(newAttrInfo, fromStringAttributeInfo);
+        }
+    }
+
+    /**
+     * Returns java class name.
+     *
+     * @param suffix for the class name based on the file type
+     * @return java class name
+     */
+    String getJavaClassName(String suffix) {
+        return getCapitalCase(getJavaFileInfo().getJavaName()) + suffix;
+    }
+
+    /**
+     * Returns the directory path.
+     *
+     * @return directory path
+     */
+    private String getDirPath() {
+        return getJavaFileInfo().getPackageFilePath();
+    }
+
+    /**
+     * Constructs java code exit.
+     *
+     * @param fileType generated file type
+     * @param curNode  current YANG node
+     * @throws IOException when fails to generate java files
+     */
+    public void generateJavaFile(int fileType, YangNode curNode)
+            throws IOException {
+        List<String> imports = new ArrayList<>();
+        imports = getJavaImportData().getImports();
+
+        createPackage(curNode);
+
+        /*
+         * Generate java code.
+         */
+        if ((fileType & INTERFACE_MASK) != 0 || (fileType &
+                BUILDER_INTERFACE_MASK) != 0) {
+
+            /*
+             * Create interface file.
+             */
+            setInterfaceJavaFileHandle(getJavaFileHandle(getJavaClassName(INTERFACE_FILE_NAME_SUFFIX)));
+            setInterfaceJavaFileHandle(
+                    generateInterfaceFile(getInterfaceJavaFileHandle(), imports, curNode, isAttributePresent()));
+            /*
+             * Create builder interface file.
+             */
+            if ((fileType & BUILDER_INTERFACE_MASK) != 0) {
+                setBuilderInterfaceJavaFileHandle(
+                        getJavaFileHandle(getJavaClassName(BUILDER_INTERFACE_FILE_NAME_SUFFIX)));
+                setBuilderInterfaceJavaFileHandle(
+                        generateBuilderInterfaceFile(getBuilderInterfaceJavaFileHandle(), curNode,
+                                isAttributePresent()));
+                /*
+                 * Append builder interface file to interface file and close it.
+                 */
+                mergeJavaFiles(getBuilderInterfaceJavaFileHandle(), getInterfaceJavaFileHandle());
+                validateLineLength(getInterfaceJavaFileHandle());
+            }
+            insertDataIntoJavaFile(getInterfaceJavaFileHandle(), getJavaClassDefClose());
+            if (isAugmentationHolderExtended(getJavaExtendsListHolder().getExtendsList())) {
+                addAugmentationHoldersImport(curNode, imports, false);
+            }
+            if (isAugmentedInfoExtended(getJavaExtendsListHolder().getExtendsList())) {
+                addAugmentedInfoImport(curNode, imports, false);
+            }
+            if (curNode instanceof YangCase) {
+                removeCaseImport(imports);
+            }
+        }
+        if ((fileType & BUILDER_CLASS_MASK) != 0 || (fileType & IMPL_CLASS_MASK) != 0) {
+            if (isAttributePresent()) {
+                addImportsToStringAndHasCodeMethods(curNode, imports);
+            }
+            if (isAugmentationHolderExtended(getJavaExtendsListHolder().getExtendsList())) {
+                addAugmentedInfoImport(curNode, imports, true);
+                addArrayListImport(curNode, imports, true);
+            }
+            sortImports(imports);
+            /*
+             * Create builder class file.
+             */
+            setBuilderClassJavaFileHandle(getJavaFileHandle(getJavaClassName(BUILDER_CLASS_FILE_NAME_SUFFIX)));
+            setBuilderClassJavaFileHandle(
+                    generateBuilderClassFile(getBuilderClassJavaFileHandle(), imports, curNode,
+                            isAttributePresent()));
+            /*
+             * Create impl class file.
+             */
+            if ((fileType & IMPL_CLASS_MASK) != 0) {
+                setImplClassJavaFileHandle(getJavaFileHandle(getJavaClassName(IMPL_CLASS_FILE_NAME_SUFFIX)));
+                setImplClassJavaFileHandle(
+                        generateImplClassFile(getImplClassJavaFileHandle(), curNode, isAttributePresent()));
+                /*
+                 * Append impl class to builder class and close it.
+                 */
+                mergeJavaFiles(getImplClassJavaFileHandle(), getBuilderClassJavaFileHandle());
+                validateLineLength(getBuilderClassJavaFileHandle());
+            }
+            insertDataIntoJavaFile(getBuilderClassJavaFileHandle(), getJavaClassDefClose());
+            if (isAugmentationHolderExtended(getJavaExtendsListHolder().getExtendsList())) {
+                addAugmentedInfoImport(curNode, imports, false);
+                addArrayListImport(curNode, imports, false);
+            }
+        }
+        /*
+         * Close all the file handles.
+         */
+        freeTemporaryResources(false);
+    }
+
+    /**
+     * Adds imports for ToString and HashCodeMethod.
+     *
+     * @param curNode current YANG node
+     * @param imports import list
+     * @return import list
+     */
+    public List<String> addImportsToStringAndHasCodeMethods(YangNode curNode, List<String> imports) {
+        imports.add(getJavaImportData().getImportForHashAndEquals());
+        imports.add(getJavaImportData().getImportForToString());
+        return imports;
+    }
+
+    /**
+     * Removes case import info from import list.
+     *
+     * @param imports list of imports
+     * @return import for class
+     */
+    private List<String> removeCaseImport(List<String> imports) {
+        if (imports != null && caseImportInfo != null) {
+            String caseImport = IMPORT + caseImportInfo.getPkgInfo() + PERIOD + caseImportInfo.getClassInfo() +
+                    SEMI_COLAN + NEW_LINE;
+            imports.remove(caseImport);
+        }
+        return imports;
+    }
+
+    /**
+     * Removes all temporary file handles.
+     *
+     * @param isErrorOccurred when translator fails to generate java files we
+     *                        need to close all open file handles include temporary files
+     *                        and java files.
+     * @throws IOException when failed to delete the temporary files
+     */
+    public void freeTemporaryResources(boolean isErrorOccurred)
+            throws IOException {
+        boolean isError = isErrorOccurred;
+        /*
+         * Close all java file handles and when error occurs delete the files.
+         */
+        if ((getGeneratedJavaFiles() & INTERFACE_MASK) != 0) {
+            closeFile(getInterfaceJavaFileHandle(), isError);
+        }
+        if ((getGeneratedJavaFiles() & BUILDER_CLASS_MASK) != 0) {
+            closeFile(getBuilderClassJavaFileHandle(), isError);
+        }
+        if ((getGeneratedJavaFiles() & BUILDER_INTERFACE_MASK) != 0) {
+            closeFile(getBuilderInterfaceJavaFileHandle(), true);
+        }
+        if ((getGeneratedJavaFiles() & IMPL_CLASS_MASK) != 0) {
+            closeFile(getImplClassJavaFileHandle(), true);
+        }
+
+        /*
+         * Close all temporary file handles and delete the files.
+         */
+        if ((getGeneratedTempFiles() & GETTER_FOR_CLASS_MASK) != 0) {
+            closeFile(getGetterImplTempFileHandle(), true);
+        }
+        if ((getGeneratedTempFiles() & ATTRIBUTES_MASK) != 0) {
+            closeFile(getAttributesTempFileHandle(), true);
+        }
+        if ((getGeneratedTempFiles() & HASH_CODE_IMPL_MASK) != 0) {
+            closeFile(getHashCodeImplTempFileHandle(), true);
+        }
+        if ((getGeneratedTempFiles() & TO_STRING_IMPL_MASK) != 0) {
+            closeFile(getToStringImplTempFileHandle(), true);
+        }
+        if ((getGeneratedTempFiles() & EQUALS_IMPL_MASK) != 0) {
+            closeFile(getEqualsImplTempFileHandle(), true);
+        }
+        if ((getGeneratedTempFiles() & FROM_STRING_IMPL_MASK) != 0) {
+            closeFile(getFromStringImplTempFileHandle(), true);
+        }
+    }
+
+    /**
+     * Returns if the attribute needs to be accessed in a qualified manner or
+     * not, if it needs to be imported, then the same needs to be done.
+     *
+     * @param importInfo import info for the current attribute being added
+     * @return status of the qualified access to the attribute
+     */
+    public boolean getIsQualifiedAccessOrAddToImportList(
+            JavaQualifiedTypeInfo importInfo) {
+
+        return getJavaImportData().addImportInfo(importInfo, getGeneratedJavaClassName(),
+                getJavaFileInfo().getPackage());
+    }
+
+    /**
+     * Checks if the import info is same as the package of the current generated
+     * java file.
+     *
+     * @param importInfo import info for an attribute
+     * @return true if the import info is same as the current nodes package
+     * false otherwise
+     */
+    public boolean isImportPkgEqualCurNodePkg(JavaQualifiedTypeInfo importInfo) {
+        return getJavaFileInfo().getPackage()
+                .contentEquals(importInfo.getPkgInfo());
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/TempJavaServiceFragmentFiles.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/TempJavaServiceFragmentFiles.java
new file mode 100644
index 0000000..0d6215e
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/TempJavaServiceFragmentFiles.java
@@ -0,0 +1,802 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.translator.tojava;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangNotification;
+import org.onosproject.yangutils.translator.tojava.javamodel.YangJavaModule;
+import org.onosproject.yangutils.translator.tojava.javamodel.YangJavaSubModule;
+import org.onosproject.yangutils.translator.tojava.utils.YangPluginConfig;
+
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.GENERATE_EVENT_CLASS;
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.GENERATE_EVENT_LISTENER_INTERFACE;
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.GENERATE_EVENT_SUBJECT_CLASS;
+import static org.onosproject.yangutils.translator.tojava.GeneratedTempFileType.EVENT_ENUM_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedTempFileType.EVENT_METHOD_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedTempFileType.EVENT_SUBJECT_ATTRIBUTE_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedTempFileType.EVENT_SUBJECT_GETTER_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedTempFileType.EVENT_SUBJECT_SETTER_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedTempFileType.RPC_IMPL_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedTempFileType.RPC_INTERFACE_MASK;
+import static org.onosproject.yangutils.translator.tojava.JavaAttributeInfo.getAttributeInfoForTheData;
+import static org.onosproject.yangutils.translator.tojava.JavaQualifiedTypeInfo.getQualifiedTypeInfoOfCurNode;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaCodeSnippetGen.getJavaClassDefClose;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaFileGenerator.generateEventFile;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaFileGenerator.generateEventListenerFile;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaFileGenerator.generateEventSubjectFile;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaFileGenerator.generateManagerClassFile;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaFileGenerator.generateServiceInterfaceFile;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaFileGeneratorUtils.getFileObject;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaIdentifierSyntax.getCamelCase;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaIdentifierSyntax.getCapitalCase;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaIdentifierSyntax.getEnumJavaAttribute;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaIdentifierSyntax.getSmallCase;
+import static org.onosproject.yangutils.translator.tojava.utils.MethodsGenerator.getGetterForClass;
+import static org.onosproject.yangutils.translator.tojava.utils.MethodsGenerator.getRpcManagerMethod;
+import static org.onosproject.yangutils.translator.tojava.utils.MethodsGenerator.getRpcServiceMethod;
+import static org.onosproject.yangutils.translator.tojava.utils.MethodsGenerator.getSetterForClass;
+import static org.onosproject.yangutils.translator.tojava.utils.TempJavaCodeFragmentFilesUtils.addAnnotationsImports;
+import static org.onosproject.yangutils.translator.tojava.utils.TempJavaCodeFragmentFilesUtils.addListnersImport;
+import static org.onosproject.yangutils.translator.tojava.utils.TempJavaCodeFragmentFilesUtils.closeFile;
+import static org.onosproject.yangutils.utils.UtilConstants.COMMA;
+import static org.onosproject.yangutils.utils.UtilConstants.EMPTY_STRING;
+import static org.onosproject.yangutils.utils.UtilConstants.EVENT_STRING;
+import static org.onosproject.yangutils.utils.UtilConstants.FOUR_SPACE_INDENTATION;
+import static org.onosproject.yangutils.utils.UtilConstants.LISTENER_REG;
+import static org.onosproject.yangutils.utils.UtilConstants.LISTENER_SERVICE;
+import static org.onosproject.yangutils.utils.UtilConstants.NEW_LINE;
+import static org.onosproject.yangutils.utils.UtilConstants.RPC_INPUT_VAR_NAME;
+import static org.onosproject.yangutils.utils.UtilConstants.SLASH;
+import static org.onosproject.yangutils.utils.UtilConstants.VOID;
+import static org.onosproject.yangutils.utils.io.impl.FileSystemUtil.createPackage;
+import static org.onosproject.yangutils.utils.io.impl.JavaDocGen.generateJavaDocForRpc;
+import static org.onosproject.yangutils.utils.io.impl.JavaDocGen.getJavaDoc;
+import static org.onosproject.yangutils.utils.io.impl.JavaDocGen.JavaDocType.ENUM_ATTRIBUTE;
+import static org.onosproject.yangutils.utils.io.impl.JavaDocGen.JavaDocType.GETTER_METHOD;
+import static org.onosproject.yangutils.utils.io.impl.JavaDocGen.JavaDocType.MANAGER_SETTER_METHOD;
+import static org.onosproject.yangutils.utils.io.impl.YangIoUtils.insertDataIntoJavaFile;
+
+/**
+ * Represents implementation of java service code fragments temporary implementations.
+ * Maintains the temp files required specific for service and manager java snippet generation.
+ */
+public class TempJavaServiceFragmentFiles
+        extends TempJavaFragmentFiles {
+
+    /**
+     * File name for rpc method.
+     */
+    private static final String RPC_INTERFACE_FILE_NAME = "Rpc";
+
+    /**
+     * File name for rpc implementation method.
+     */
+    private static final String RPC_IMPL_FILE_NAME = "RpcImpl";
+
+    /**
+     * File name for event enum temp file.
+     */
+    private static final String EVENT_ENUM_FILE_NAME = "EventEnum";
+
+    /**
+     * File name for event method temp file.
+     */
+    private static final String EVENT_METHOD_FILE_NAME = "EventMethod";
+
+    /**
+     * File name for event subject attribute temp file.
+     */
+    private static final String EVENT_SUBJECT_ATTRIBUTE_FILE_NAME = "EventSubjectAttribute";
+
+    /**
+     * File name for event subject getter temp file.
+     */
+    private static final String EVENT_SUBJECT_GETTER_FILE_NAME = "EventSubjectGetter";
+
+    /**
+     * File name for event subject setter temp file.
+     */
+    private static final String EVENT_SUBJECT_SETTER_FILE_NAME = "EventSubjectSetter";
+
+    /**
+     * File name for generated class file for service
+     * suffix.
+     */
+    private static final String SERVICE_FILE_NAME_SUFFIX = "Service";
+
+    /**
+     * File name for generated class file for manager
+     * suffix.
+     */
+    private static final String MANAGER_FILE_NAME_SUFFIX = "Manager";
+
+    /**
+     * File name for generated class file for special type like union, typedef
+     * suffix.
+     */
+    private static final String EVENT_FILE_NAME_SUFFIX = "Event";
+
+    /**
+     * File name for generated class file for special type like union, typedef
+     * suffix.
+     */
+    private static final String EVENT_LISTENER_FILE_NAME_SUFFIX = "Listener";
+
+    /**
+     * File name for generated class file for special type like union, typedef
+     * suffix.
+     */
+    public static final String EVENT_SUBJECT_NAME_SUFFIX = "EventSubject";
+
+    private static final String JAVA_FILE_EXTENSION = ".java";
+
+    /**
+     * Java file handle for event subject file.
+     */
+    private File eventSubjectJavaFileHandle;
+
+    /**
+     * Java file handle for event listener file.
+     */
+    private File eventListenerJavaFileHandle;
+
+    /**
+     * Java file handle for event file.
+     */
+    private File eventJavaFileHandle;
+
+    /**
+     * Temporary file handle for rpc interface.
+     */
+    private File rpcInterfaceTempFileHandle;
+
+    /**
+     * Temporary file handle for rpc manager impl.
+     */
+    private File rpcImplTempFileHandle;
+
+    /**
+     * Java file handle for rpc interface file.
+     */
+    private File serviceInterfaceJavaFileHandle;
+
+    /**
+     * Java file handle for manager impl file.
+     */
+    private File managerJavaFileHandle;
+
+    /**
+     * Java file handle for event enum impl file.
+     */
+    private File eventEnumTempFileHandle;
+
+    /**
+     * Java file handle for event method impl file.
+     */
+    private File eventMethodTempFileHandle;
+
+    /**
+     * Java file handle for event subject attribute file.
+     */
+    private File eventSubjectAttributeTempFileHandle;
+
+    /**
+     * Java file handle for event subject getter impl file.
+     */
+    private File eventSubjectGetterTempFileHandle;
+
+    /**
+     * Java file handle for event subject setter impl file.
+     */
+    private File eventSubjectSetterTempFileHandle;
+
+    /**
+     * Returns rpc method's java file handle.
+     *
+     * @return java file handle
+     */
+    private File getServiceInterfaceJavaFileHandle() {
+        return serviceInterfaceJavaFileHandle;
+    }
+
+    /**
+     * Sets rpc method's java file handle.
+     *
+     * @param serviceInterfaceJavaFileHandle file handle for to rpc method
+     */
+    private void setServiceInterfaceJavaFileHandle(File serviceInterfaceJavaFileHandle) {
+        this.serviceInterfaceJavaFileHandle = serviceInterfaceJavaFileHandle;
+    }
+
+    /**
+     * Returns managers java file handle.
+     *
+     * @return java file handle
+     */
+    public File getManagerJavaFileHandle() {
+        return managerJavaFileHandle;
+    }
+
+    /**
+     * Sets manager java file handle.
+     *
+     * @param managerJavaFileHandle file handle for to manager
+     */
+    public void setManagerJavaFileHandle(File managerJavaFileHandle) {
+        this.managerJavaFileHandle = managerJavaFileHandle;
+    }
+
+    /**
+     * Returns rpc method's temporary file handle.
+     *
+     * @return temporary file handle
+     */
+    public File getRpcInterfaceTempFileHandle() {
+        return rpcInterfaceTempFileHandle;
+    }
+
+    /**
+     * Sets rpc method's temporary file handle.
+     *
+     * @param rpcInterfaceTempFileHandle file handle for to rpc method
+     */
+    private void setRpcInterfaceTempFileHandle(File rpcInterfaceTempFileHandle) {
+        this.rpcInterfaceTempFileHandle = rpcInterfaceTempFileHandle;
+    }
+
+    /**
+     * Retrieves the manager impl temp file.
+     *
+     * @return the manager impl temp file
+     */
+    public File getRpcImplTempFileHandle() {
+        return rpcImplTempFileHandle;
+    }
+
+    /**
+     * Sets the manager impl temp file.
+     *
+     * @param rpcImplTempFileHandle the manager impl temp file
+     */
+    public void setRpcImplTempFileHandle(File rpcImplTempFileHandle) {
+        this.rpcImplTempFileHandle = rpcImplTempFileHandle;
+    }
+
+    /**
+     * Returns event's java file handle.
+     *
+     * @return java file handle
+     */
+    private File getEventJavaFileHandle() {
+        return eventJavaFileHandle;
+    }
+
+    /**
+     * Sets event's java file handle.
+     *
+     * @param eventJavaFileHandle file handle for event
+     */
+    private void setEventJavaFileHandle(File eventJavaFileHandle) {
+        this.eventJavaFileHandle = eventJavaFileHandle;
+    }
+
+    /**
+     * Returns event listeners's java file handle.
+     *
+     * @return java file handle
+     */
+    private File getEventListenerJavaFileHandle() {
+        return eventListenerJavaFileHandle;
+    }
+
+    /**
+     * Sets event's java file handle.
+     *
+     * @param eventListenerJavaFileHandle file handle for event
+     */
+    private void setEventListenerJavaFileHandle(File eventListenerJavaFileHandle) {
+        this.eventListenerJavaFileHandle = eventListenerJavaFileHandle;
+    }
+
+    /**
+     * Returns event subject's java file handle.
+     *
+     * @return java file handle
+     */
+    private File getEventSubjectJavaFileHandle() {
+        return eventSubjectJavaFileHandle;
+    }
+
+    /**
+     * Sets event's subject java file handle.
+     *
+     * @param eventSubjectJavaFileHandle file handle for event's subject
+     */
+    private void setEventSubjectJavaFileHandle(File eventSubjectJavaFileHandle) {
+        this.eventSubjectJavaFileHandle = eventSubjectJavaFileHandle;
+    }
+
+    /**
+     * Creates an instance of temporary java code fragment.
+     *
+     * @param javaFileInfo generated file information
+     * @throws IOException when fails to create new file handle
+     */
+    public TempJavaServiceFragmentFiles(JavaFileInfo javaFileInfo)
+            throws IOException {
+        super(javaFileInfo);
+
+        addGeneratedTempFile(RPC_INTERFACE_MASK);
+        addGeneratedTempFile(RPC_IMPL_MASK);
+
+        addGeneratedTempFile(EVENT_ENUM_MASK);
+        addGeneratedTempFile(EVENT_METHOD_MASK);
+        addGeneratedTempFile(EVENT_SUBJECT_ATTRIBUTE_MASK);
+        addGeneratedTempFile(EVENT_SUBJECT_GETTER_MASK);
+        addGeneratedTempFile(EVENT_SUBJECT_SETTER_MASK);
+
+        setRpcInterfaceTempFileHandle(getTemporaryFileHandle(RPC_INTERFACE_FILE_NAME));
+        setRpcImplTempFileHandle(getTemporaryFileHandle(RPC_IMPL_FILE_NAME));
+
+        setEventEnumTempFileHandle(getTemporaryFileHandle(EVENT_ENUM_FILE_NAME));
+        setEventMethodTempFileHandle(getTemporaryFileHandle(EVENT_METHOD_FILE_NAME));
+        setEventSubjectAttributeTempFileHandle(getTemporaryFileHandle(EVENT_SUBJECT_ATTRIBUTE_FILE_NAME));
+        setEventSubjectGetterTempFileHandle(getTemporaryFileHandle(EVENT_SUBJECT_GETTER_FILE_NAME));
+        setEventSubjectSetterTempFileHandle(getTemporaryFileHandle(EVENT_SUBJECT_SETTER_FILE_NAME));
+    }
+
+    /**
+     * Constructs java code exit.
+     *
+     * @param fileType generated file type
+     * @param curNode  current YANG node
+     * @throws IOException when fails to generate java files
+     */
+    @Override
+    public void generateJavaFile(int fileType, YangNode curNode)
+            throws IOException {
+        List<String> imports = getJavaImportData().getImports();
+
+        createPackage(curNode);
+
+        boolean isNotification = false;
+        if (curNode instanceof YangJavaModule) {
+            if (!((YangJavaModule) curNode).getNotificationNodes().isEmpty()) {
+                isNotification = true;
+            }
+        } else if (curNode instanceof YangJavaSubModule) {
+            if (!((YangJavaSubModule) curNode).getNotificationNodes().isEmpty()) {
+                isNotification = true;
+            }
+        }
+
+        if (isNotification) {
+            addListnersImport(curNode, imports, true, LISTENER_SERVICE);
+        }
+        /**
+         * Creates rpc interface file.
+         */
+        setServiceInterfaceJavaFileHandle(getJavaFileHandle(getJavaClassName(SERVICE_FILE_NAME_SUFFIX)));
+        generateServiceInterfaceFile(getServiceInterfaceJavaFileHandle(), curNode, imports, isAttributePresent());
+
+        if (isNotification) {
+            addListnersImport(curNode, imports, false, LISTENER_SERVICE);
+            addListnersImport(curNode, imports, true, LISTENER_REG);
+        }
+        addAnnotationsImports(imports, true);
+        /**
+         * Create builder class file.
+         */
+        setManagerJavaFileHandle(getJavaFileHandle(getJavaClassName(MANAGER_FILE_NAME_SUFFIX)));
+        generateManagerClassFile(getManagerJavaFileHandle(), imports, curNode, isAttributePresent());
+
+        insertDataIntoJavaFile(getManagerJavaFileHandle(), getJavaClassDefClose());
+        if (isNotification) {
+            addListnersImport(curNode, imports, false, LISTENER_REG);
+        }
+        addAnnotationsImports(imports, false);
+
+        if (isNotification) {
+            generateEventJavaFile(GENERATE_EVENT_CLASS, curNode);
+            generateEventListenerJavaFile(GENERATE_EVENT_LISTENER_INTERFACE, curNode);
+            generateEventSubjectJavaFile(GENERATE_EVENT_SUBJECT_CLASS, curNode);
+        }
+
+        /**
+         * Close all the file handles.
+         */
+        freeTemporaryResources(false);
+    }
+
+    /**
+     * Adds rpc string information to applicable temp file.
+     *
+     * @param javaAttributeInfoOfInput  rpc's input node attribute info
+     * @param javaAttributeInfoOfOutput rpc's output node attribute info
+     * @param rpcName                   name of the rpc function
+     * @param pluginConfig              plugin configurations
+     * @throws IOException IO operation fail
+     */
+    private void addRpcString(JavaAttributeInfo javaAttributeInfoOfInput,
+            JavaAttributeInfo javaAttributeInfoOfOutput, YangPluginConfig pluginConfig,
+            String rpcName)
+            throws IOException {
+        String rpcInput = EMPTY_STRING;
+        String rpcOutput = VOID;
+        String rpcInputJavaDoc = EMPTY_STRING;
+        if (javaAttributeInfoOfInput != null) {
+            rpcInput = getCapitalCase(javaAttributeInfoOfInput.getAttributeName());
+        }
+        if (javaAttributeInfoOfOutput != null) {
+            rpcOutput = getCapitalCase(javaAttributeInfoOfOutput.getAttributeName());
+        }
+        if (!rpcInput.equals(EMPTY_STRING)) {
+            rpcInputJavaDoc = RPC_INPUT_VAR_NAME;
+        }
+        appendToFile(getRpcInterfaceTempFileHandle(),
+                generateJavaDocForRpc(rpcName, rpcInputJavaDoc, rpcOutput, pluginConfig)
+                        + getRpcServiceMethod(rpcName, rpcInput, rpcOutput, pluginConfig) + NEW_LINE);
+        appendToFile(getRpcImplTempFileHandle(),
+                getRpcManagerMethod(rpcName, rpcInput, rpcOutput, pluginConfig) + NEW_LINE);
+    }
+
+    /**
+     * Adds the JAVA rpc snippet information.
+     *
+     * @param javaAttributeInfoOfInput  rpc's input node attribute info
+     * @param javaAttributeInfoOfOutput rpc's output node attribute info
+     * @param pluginConfig              plugin configurations
+     * @param rpcName                   name of the rpc function
+     * @throws IOException IO operation fail
+     */
+    public void addJavaSnippetInfoToApplicableTempFiles(JavaAttributeInfo javaAttributeInfoOfInput,
+            JavaAttributeInfo javaAttributeInfoOfOutput, YangPluginConfig pluginConfig,
+            String rpcName)
+            throws IOException {
+        addRpcString(javaAttributeInfoOfInput, javaAttributeInfoOfOutput, pluginConfig, rpcName);
+    }
+
+    /**
+     * Constructs java code exit.
+     *
+     * @param fileType generated file type
+     * @param curNode  current YANG node
+     * @throws IOException when fails to generate java files
+     */
+    public void generateEventJavaFile(int fileType, YangNode curNode)
+            throws IOException {
+
+        List<String> imports = new ArrayList<>();
+
+        imports.add(getJavaImportData().getAbstractEventsImport());
+        String curNodeInfo = getCapitalCase(((JavaFileInfoContainer) curNode).getJavaFileInfo().getJavaName());
+        String nodeName = curNodeInfo + EVENT_STRING;
+
+        addEnumMethod(nodeName, curNodeInfo + EVENT_SUBJECT_NAME_SUFFIX);
+
+        /**
+         * Creates event interface file.
+         */
+        setEventJavaFileHandle(getJavaFileHandle(curNode, curNodeInfo + EVENT_FILE_NAME_SUFFIX));
+        generateEventFile(getEventJavaFileHandle(), curNode, imports);
+
+        /**
+         * Close all the file handles.
+         */
+        freeTemporaryResources(false);
+    }
+
+    /**
+     * Constructs java code exit.
+     *
+     * @param fileType generated file type
+     * @param curNode  current YANG node
+     * @throws IOException when fails to generate java files
+     */
+    public void generateEventListenerJavaFile(int fileType, YangNode curNode)
+            throws IOException {
+
+        List<String> imports = new ArrayList<>();
+
+        imports.add(getJavaImportData().getEventListenerImport());
+        String curNodeInfo = getCapitalCase(((JavaFileInfoContainer) curNode)
+                .getJavaFileInfo().getJavaName());
+        /**
+         * Creates event listener interface file.
+         */
+        setEventListenerJavaFileHandle(
+                getJavaFileHandle(curNode, curNodeInfo + EVENT_LISTENER_FILE_NAME_SUFFIX));
+        generateEventListenerFile(getEventListenerJavaFileHandle(), curNode, imports);
+
+        /**
+         * Close all the file handles.
+         */
+        freeTemporaryResources(false);
+    }
+
+    /**
+     * Constructs java code exit.
+     *
+     * @param fileType generated file type
+     * @param curNode  current YANG node
+     * @throws IOException when fails to generate java files
+     */
+    public void generateEventSubjectJavaFile(int fileType, YangNode curNode)
+            throws IOException {
+
+        String curNodeInfo = getCapitalCase(((JavaFileInfoContainer) curNode)
+                .getJavaFileInfo().getJavaName());
+        /**
+         * Creates event interface file.
+         */
+        setEventSubjectJavaFileHandle(getJavaFileHandle(curNode, curNodeInfo +
+                EVENT_SUBJECT_NAME_SUFFIX));
+        generateEventSubjectFile(getEventSubjectJavaFileHandle(), curNode);
+
+        /**
+         * Close all the file handles.
+         */
+        freeTemporaryResources(false);
+    }
+
+    /**
+     * Removes all temporary file handles.
+     *
+     * @param isErrorOccurred when translator fails to generate java files we
+     *                        need to close all open file handles include temporary files
+     *                        and java files.
+     * @throws IOException when failed to delete the temporary files
+     */
+    @Override
+    public void freeTemporaryResources(boolean isErrorOccurred)
+            throws IOException {
+        boolean isError = isErrorOccurred;
+
+        closeFile(getServiceInterfaceJavaFileHandle(), isError);
+        closeFile(getManagerJavaFileHandle(), isError);
+
+        if (getEventJavaFileHandle() != null) {
+            closeFile(getEventJavaFileHandle(), isError);
+        }
+        if (getEventListenerJavaFileHandle() != null) {
+            closeFile(getEventListenerJavaFileHandle(), isError);
+        }
+        if (getEventSubjectJavaFileHandle() != null) {
+            closeFile(getEventSubjectJavaFileHandle(), isError);
+        }
+
+        closeFile(getRpcInterfaceTempFileHandle(), true);
+        closeFile(getRpcImplTempFileHandle(), true);
+        closeFile(getGetterInterfaceTempFileHandle(), true);
+        closeFile(getSetterInterfaceTempFileHandle(), true);
+        closeFile(getSetterImplTempFileHandle(), true);
+
+        super.freeTemporaryResources(isErrorOccurred);
+
+    }
+
+    /**
+     * Returns event enum temp file.
+     *
+     * @return event enum temp file
+     */
+    public File getEventEnumTempFileHandle() {
+        return eventEnumTempFileHandle;
+    }
+
+    /**
+     * Sets event enum temp file.
+     *
+     * @param eventEnumTempFileHandle event enum temp file
+     */
+    public void setEventEnumTempFileHandle(File eventEnumTempFileHandle) {
+        this.eventEnumTempFileHandle = eventEnumTempFileHandle;
+    }
+
+    /**
+     * Returns event method temp file.
+     *
+     * @return event method temp file
+     */
+    public File getEventMethodTempFileHandle() {
+        return eventMethodTempFileHandle;
+    }
+
+    /**
+     * Sets event method temp file.
+     *
+     * @param eventMethodTempFileHandle event method temp file
+     */
+    public void setEventMethodTempFileHandle(File eventMethodTempFileHandle) {
+        this.eventMethodTempFileHandle = eventMethodTempFileHandle;
+    }
+
+    /**
+     * Returns event subject attribute temp file.
+     *
+     * @return event subject attribute temp file
+     */
+    public File getEventSubjectAttributeTempFileHandle() {
+        return eventSubjectAttributeTempFileHandle;
+    }
+
+    /**
+     * Sets event subject attribute temp file.
+     *
+     * @param eventSubjectAttributeTempFileHandle event subject attribute temp file
+     */
+    public void setEventSubjectAttributeTempFileHandle(File eventSubjectAttributeTempFileHandle) {
+        this.eventSubjectAttributeTempFileHandle = eventSubjectAttributeTempFileHandle;
+    }
+
+    /**
+     * Returns event subject getter temp file.
+     *
+     * @return event subject getter temp file
+     */
+    public File getEventSubjectGetterTempFileHandle() {
+        return eventSubjectGetterTempFileHandle;
+    }
+
+    /**
+     * Sets event subject getter temp file.
+     *
+     * @param eventSubjectGetterTempFileHandle event subject getter temp file
+     */
+    public void setEventSubjectGetterTempFileHandle(File eventSubjectGetterTempFileHandle) {
+        this.eventSubjectGetterTempFileHandle = eventSubjectGetterTempFileHandle;
+    }
+
+    /**
+     * Returns event subject setter temp file.
+     *
+     * @return event subject setter temp file
+     */
+    public File getEventSubjectSetterTempFileHandle() {
+        return eventSubjectSetterTempFileHandle;
+    }
+
+    /**
+     * Sets event subject setter temp file.
+     *
+     * @param eventSubjectSetterTempFileHandle event subject setter temp file
+     */
+    public void setEventSubjectSetterTempFileHandle(File eventSubjectSetterTempFileHandle) {
+        this.eventSubjectSetterTempFileHandle = eventSubjectSetterTempFileHandle;
+    }
+
+    /**
+     * Adds java snippet for events to event subject file.
+     *
+     * @param curNode      current node
+     * @param pluginConfig plugin configurations
+     * @throws IOException when fails to do IO operations
+     */
+    public void addJavaSnippetOfEvent(YangNode curNode, YangPluginConfig pluginConfig)
+            throws IOException {
+
+        String currentInfo = getCapitalCase(getCamelCase(((YangNotification) curNode).getName(),
+                pluginConfig.getConflictResolver()));
+        String notificationName = ((YangNotification) curNode).getName();
+
+        JavaQualifiedTypeInfo qualifiedTypeInfo = getQualifiedTypeInfoOfCurNode(curNode,
+                getCapitalCase(currentInfo));
+
+        JavaAttributeInfo javaAttributeInfo = getAttributeInfoForTheData(qualifiedTypeInfo, getSmallCase(currentInfo),
+                null, false, false);
+
+        /*Adds java info for event in respective temp files.*/
+        addEventEnum(notificationName, pluginConfig);
+        addEventSubjectAttribute(javaAttributeInfo, pluginConfig);
+        addEventSubjectGetter(javaAttributeInfo, pluginConfig);
+        addEventSubjectSetter(javaAttributeInfo, pluginConfig, currentInfo);
+    }
+
+    /*Adds event to enum temp file.*/
+    private void addEventEnum(String notificationName, YangPluginConfig pluginConfig)
+            throws IOException {
+        appendToFile(getEventEnumTempFileHandle(),
+                getJavaDoc(ENUM_ATTRIBUTE, notificationName, false, pluginConfig) + FOUR_SPACE_INDENTATION
+                        + getEnumJavaAttribute(notificationName).toUpperCase() + COMMA + NEW_LINE);
+    }
+
+    /*Adds event method in event class*/
+    private void addEnumMethod(String eventClassname, String className)
+            throws IOException {
+        appendToFile(getEventMethodTempFileHandle(), getEventFileContents(eventClassname, className));
+    }
+
+    /*Adds event method contents to event file.*/
+    private static String getEventFileContents(String eventClassname, String classname) {
+        return "\n" +
+                "    /**\n" +
+                "     * Creates " + classname + " event with type and subject.\n" +
+                "     *\n" +
+                "     * @param type event type\n" +
+                "     * @param subject subject " + classname + "\n" +
+                "     */\n" +
+                "    public " + eventClassname + "(Type type, " + getCapitalCase(classname) + " subject) {\n" +
+                "        super(type, subject);\n" +
+                "    }\n" +
+                "\n" +
+                "    /**\n" +
+                "     * Creates " + classname + " event with type, subject and time.\n" +
+                "     *\n" +
+                "     * @param type event type\n" +
+                "     * @param subject subject " + classname + "\n" +
+                "     * @param time time of event\n" +
+                "     */\n" +
+                "    public " + eventClassname + "(Type type, " + getCapitalCase(classname)
+                + " subject, long time) {\n" +
+                "        super(type, subject, time);\n" +
+                "    }\n" +
+                "\n";
+    }
+
+    /*Adds events to event subject file.*/
+    private void addEventSubjectAttribute(JavaAttributeInfo attr, YangPluginConfig pluginConfig)
+            throws IOException {
+        appendToFile(getEventSubjectAttributeTempFileHandle(),
+                FOUR_SPACE_INDENTATION + parseAttribute(attr, pluginConfig));
+    }
+
+    /*Adds getter method for event in event subject class.*/
+    private void addEventSubjectGetter(JavaAttributeInfo attr, YangPluginConfig pluginConfig)
+            throws IOException {
+        appendToFile(getEventSubjectGetterTempFileHandle(),
+                getJavaDoc(GETTER_METHOD, getCapitalCase(attr.getAttributeName()), false, pluginConfig)
+                        + getGetterForClass(attr, GENERATE_EVENT_SUBJECT_CLASS) + NEW_LINE);
+    }
+
+    /*Adds setter method for event in event subject class.*/
+    private void addEventSubjectSetter(JavaAttributeInfo attr, YangPluginConfig pluginConfig, String className)
+            throws IOException {
+        appendToFile(getEventSubjectSetterTempFileHandle(),
+                getJavaDoc(MANAGER_SETTER_METHOD, getCapitalCase(attr.getAttributeName()), false, pluginConfig)
+                        + getSetterForClass(attr, className, GENERATE_EVENT_SUBJECT_CLASS) + NEW_LINE);
+    }
+
+    /**
+     * Returns a temporary file handle for the event's file type.
+     *
+     * @param fileName file name
+     * @return temporary file handle
+     * @throws IOException when fails to create new file handle
+     */
+    private File getJavaFileHandle(YangNode curNode, String name)
+            throws IOException {
+
+        JavaFileInfo parentInfo = ((JavaFileInfoContainer) curNode).getJavaFileInfo();
+
+        return getFileObject(getDirPath(parentInfo), name, JAVA_FILE_EXTENSION,
+                parentInfo);
+    }
+
+    /**
+     * Returns the directory path.
+     *
+     * @return directory path
+     */
+    private String getDirPath(JavaFileInfo parentInfo) {
+        return (parentInfo.getPackageFilePath() + SLASH + parentInfo.getJavaName()).toLowerCase();
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/TempJavaTypeFragmentFiles.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/TempJavaTypeFragmentFiles.java
new file mode 100644
index 0000000..930b6b4
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/TempJavaTypeFragmentFiles.java
@@ -0,0 +1,353 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.translator.tojava;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangType;
+import org.onosproject.yangutils.datamodel.YangTypeHolder;
+import org.onosproject.yangutils.translator.exception.TranslatorException;
+import org.onosproject.yangutils.translator.tojava.javamodel.YangJavaType;
+import org.onosproject.yangutils.translator.tojava.utils.YangPluginConfig;
+
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.GENERATE_TYPEDEF_CLASS;
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.GENERATE_UNION_CLASS;
+import static org.onosproject.yangutils.translator.tojava.GeneratedTempFileType.CONSTRUCTOR_FOR_TYPE_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedTempFileType.FROM_STRING_IMPL_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedTempFileType.OF_STRING_IMPL_MASK;
+import static org.onosproject.yangutils.translator.tojava.JavaAttributeInfo.getAttributeInfoForTheData;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaFileGenerator.generateTypeDefClassFile;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaFileGenerator.generateUnionClassFile;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaIdentifierSyntax.getCamelCase;
+import static org.onosproject.yangutils.translator.tojava.utils.MethodsGenerator.getOfMethodStringAndJavaDoc;
+import static org.onosproject.yangutils.translator.tojava.utils.MethodsGenerator.getTypeConstructorStringAndJavaDoc;
+import static org.onosproject.yangutils.translator.tojava.utils.TempJavaCodeFragmentFilesUtils.closeFile;
+import static org.onosproject.yangutils.utils.UtilConstants.EMPTY_STRING;
+import static org.onosproject.yangutils.utils.UtilConstants.NEW_LINE;
+import static org.onosproject.yangutils.utils.io.impl.FileSystemUtil.createPackage;
+
+/**
+ * Represents implementation of java data type code fragments temporary implementations.
+ * Maintains the temp files required specific for user defined data type java snippet generation.
+ */
+public class TempJavaTypeFragmentFiles
+        extends TempJavaFragmentFiles {
+
+    /**
+     * File name for of string method.
+     */
+    private static final String OF_STRING_METHOD_FILE_NAME = "OfString";
+
+    /**
+     * File name for construction for special type like union, typedef.
+     */
+    private static final String CONSTRUCTOR_FOR_TYPE_FILE_NAME = "ConstructorForType";
+
+    /**
+     * File name for typedef class file name suffix.
+     */
+    private static final String TYPEDEF_CLASS_FILE_NAME_SUFFIX = EMPTY_STRING;
+
+    /**
+     * File name for generated class file for special type like union, typedef
+     * suffix.
+     */
+    private static final String UNION_TYPE_CLASS_FILE_NAME_SUFFIX = EMPTY_STRING;
+
+    /**
+     * Temporary file handle for of string method of class.
+     */
+    private File ofStringImplTempFileHandle;
+
+    /**
+     * Temporary file handle for constructor for type class.
+     */
+    private File constructorForTypeTempFileHandle;
+
+    /**
+     * Java file handle for typedef class file.
+     */
+    private File typedefClassJavaFileHandle;
+
+    /**
+     * Java file handle for type class like union, typedef file.
+     */
+    private File typeClassJavaFileHandle;
+
+    /**
+     * Creates an instance of temporary java code fragment.
+     *
+     * @param javaFileInfo generated java file info
+     * @throws IOException when fails to create new file handle
+     */
+    public TempJavaTypeFragmentFiles(JavaFileInfo javaFileInfo)
+            throws IOException {
+
+        super(javaFileInfo);
+
+        /*
+         * Initialize getterImpl, attributes, hash code, equals and to strings
+         * when generation file type matches to typeDef class mask.
+         */
+        addGeneratedTempFile(OF_STRING_IMPL_MASK);
+        addGeneratedTempFile(CONSTRUCTOR_FOR_TYPE_MASK);
+        addGeneratedTempFile(FROM_STRING_IMPL_MASK);
+
+        setOfStringImplTempFileHandle(getTemporaryFileHandle(OF_STRING_METHOD_FILE_NAME));
+        setConstructorForTypeTempFileHandle(getTemporaryFileHandle(CONSTRUCTOR_FOR_TYPE_FILE_NAME));
+
+    }
+
+    /**
+     * Returns type class constructor method's temporary file handle.
+     *
+     * @return type class constructor method's temporary file handle
+     */
+
+    public File getConstructorForTypeTempFileHandle() {
+        return constructorForTypeTempFileHandle;
+    }
+
+    /**
+     * Sets type class constructor method's temporary file handle.
+     *
+     * @param constructorForTypeTempFileHandle type class constructor method's
+     * temporary file handle
+     */
+    private void setConstructorForTypeTempFileHandle(File constructorForTypeTempFileHandle) {
+        this.constructorForTypeTempFileHandle = constructorForTypeTempFileHandle;
+    }
+
+    /**
+     * Returns java file handle for typedef class file.
+     *
+     * @return java file handle for typedef class file
+     */
+    File getTypedefClassJavaFileHandle() {
+        return typedefClassJavaFileHandle;
+    }
+
+    /**
+     * Sets the java file handle for typedef class file.
+     *
+     * @param typedefClassJavaFileHandle java file handle
+     */
+    private void setTypedefClassJavaFileHandle(File typedefClassJavaFileHandle) {
+        this.typedefClassJavaFileHandle = typedefClassJavaFileHandle;
+    }
+
+    /**
+     * Returns java file handle for type class file.
+     *
+     * @return java file handle for type class file
+     */
+    File getTypeClassJavaFileHandle() {
+        return typeClassJavaFileHandle;
+    }
+
+    /**
+     * Sets the java file handle for type class file.
+     *
+     * @param typeClassJavaFileHandle type file handle
+     */
+    private void setTypeClassJavaFileHandle(File typeClassJavaFileHandle) {
+        this.typeClassJavaFileHandle = typeClassJavaFileHandle;
+    }
+
+    /**
+     * Returns of string method's temporary file handle.
+     *
+     * @return of string method's temporary file handle
+     */
+
+    public File getOfStringImplTempFileHandle() {
+        return ofStringImplTempFileHandle;
+    }
+
+    /**
+     * Set of string method's temporary file handle.
+     *
+     * @param ofStringImplTempFileHandle of string method's temporary file
+     * handle
+     */
+    private void setOfStringImplTempFileHandle(File ofStringImplTempFileHandle) {
+        this.ofStringImplTempFileHandle = ofStringImplTempFileHandle;
+    }
+
+    /**
+     * Adds all the type in the current data model node as part of the generated
+     * temporary file.
+     *
+     * @param yangTypeHolder YANG java data model node which has type info, eg union /
+     * typedef
+     * @param pluginConfig plugin configurations for naming conventions
+     * @throws IOException IO operation fail
+     */
+    public void addTypeInfoToTempFiles(YangTypeHolder yangTypeHolder, YangPluginConfig pluginConfig)
+            throws IOException {
+
+        List<YangType<?>> typeList = yangTypeHolder.getTypeList();
+        if (typeList != null) {
+            for (YangType<?> yangType : typeList) {
+                if (!(yangType instanceof YangJavaType)) {
+                    throw new TranslatorException("Type does not have Java info");
+                }
+                YangJavaType<?> javaType = (YangJavaType<?>) yangType;
+                javaType.updateJavaQualifiedInfo(pluginConfig.getConflictResolver());
+                String typeName = javaType.getDataTypeName();
+                typeName = getCamelCase(typeName, pluginConfig.getConflictResolver());
+                JavaAttributeInfo javaAttributeInfo = getAttributeInfoForTheData(
+                        javaType.getJavaQualifiedInfo(),
+                        typeName, javaType,
+                        getIsQualifiedAccessOrAddToImportList(javaType.getJavaQualifiedInfo()),
+                        false);
+                addJavaSnippetInfoToApplicableTempFiles((YangNode) yangTypeHolder, javaAttributeInfo,
+                        pluginConfig);
+            }
+        }
+    }
+
+    /**
+     * Adds the new attribute info to the target generated temporary files for
+     * union class.
+     *
+     * @param hasType the node for which the type is being added as an attribute
+     * @param javaAttributeInfo the attribute info that needs to be added to
+     * temporary files
+     * @param pluginConfig plugin configurations
+     * @throws IOException IO operation fail
+     */
+    private void addJavaSnippetInfoToApplicableTempFiles(YangNode hasType, JavaAttributeInfo javaAttributeInfo,
+            YangPluginConfig pluginConfig)
+            throws IOException {
+
+        super.addJavaSnippetInfoToApplicableTempFiles(javaAttributeInfo, pluginConfig);
+
+        if ((getGeneratedTempFiles() & OF_STRING_IMPL_MASK) != 0) {
+            addOfStringMethod(javaAttributeInfo, pluginConfig);
+        }
+        if ((getGeneratedTempFiles() & CONSTRUCTOR_FOR_TYPE_MASK) != 0) {
+            addTypeConstructor(javaAttributeInfo, pluginConfig);
+        }
+    }
+
+    /**
+     * Adds type constructor.
+     *
+     * @param attr attribute info
+     * @param pluginConfig plugin configurations
+     * @throws IOException when fails to append to temporary file
+     */
+    private void addTypeConstructor(JavaAttributeInfo attr, YangPluginConfig pluginConfig)
+            throws IOException {
+        appendToFile(getConstructorForTypeTempFileHandle(), getTypeConstructorStringAndJavaDoc(attr,
+                getGeneratedJavaClassName(), pluginConfig) + NEW_LINE);
+    }
+
+    /**
+     * Adds of string for type.
+     *
+     * @param attr attribute info
+     * @param pluginConfig plugin configurations
+     * @throws IOException when fails to append to temporary file
+     */
+    private void addOfStringMethod(JavaAttributeInfo attr, YangPluginConfig pluginConfig)
+            throws IOException {
+        appendToFile(getOfStringImplTempFileHandle(), getOfMethodStringAndJavaDoc(attr,
+                getGeneratedJavaClassName(), pluginConfig)
+                + NEW_LINE);
+    }
+
+    /**
+     * Removes all temporary file handles.
+     *
+     * @param isErrorOccurred when translator fails to generate java files we
+     * need to close all open file handles include temporary files
+     * and java files.
+     * @throws IOException when failed to delete the temporary files
+     */
+    @Override
+    public void freeTemporaryResources(boolean isErrorOccurred)
+            throws IOException {
+        boolean isError = isErrorOccurred;
+
+        if ((getGeneratedJavaFiles() & GENERATE_TYPEDEF_CLASS) != 0) {
+            closeFile(getTypedefClassJavaFileHandle(), isError);
+        }
+
+        if ((getGeneratedJavaFiles() & GENERATE_UNION_CLASS) != 0) {
+            closeFile(getTypeClassJavaFileHandle(), isError);
+        }
+
+        if ((getGeneratedTempFiles() & CONSTRUCTOR_FOR_TYPE_MASK) != 0) {
+            closeFile(getConstructorForTypeTempFileHandle(), true);
+        }
+        if ((getGeneratedTempFiles() & OF_STRING_IMPL_MASK) != 0) {
+            closeFile(getOfStringImplTempFileHandle(), true);
+        }
+        if ((getGeneratedTempFiles() & FROM_STRING_IMPL_MASK) != 0) {
+            closeFile(getFromStringImplTempFileHandle(), true);
+        }
+
+        super.freeTemporaryResources(isErrorOccurred);
+
+    }
+
+    /**
+     * Constructs java code exit.
+     *
+     * @param fileType generated file type
+     * @param curNode current YANG node
+     * @throws IOException when fails to generate java files
+     */
+    @Override
+    public void generateJavaFile(int fileType, YangNode curNode)
+            throws IOException {
+        List<String> imports = new ArrayList<>();
+        if (isAttributePresent()) {
+            imports = getJavaImportData().getImports();
+        }
+
+        createPackage(curNode);
+
+        /*
+         * Creates type def class file.
+         */
+        if ((fileType & GENERATE_TYPEDEF_CLASS) != 0) {
+            addImportsToStringAndHasCodeMethods(curNode, imports);
+            setTypedefClassJavaFileHandle(getJavaFileHandle(getJavaClassName(TYPEDEF_CLASS_FILE_NAME_SUFFIX)));
+            generateTypeDefClassFile(getTypedefClassJavaFileHandle(), curNode, imports);
+        }
+        /*
+         * Creates type class file.
+         */
+        if ((fileType & GENERATE_UNION_CLASS) != 0) {
+            addImportsToStringAndHasCodeMethods(curNode, imports);
+            setTypeClassJavaFileHandle(getJavaFileHandle(getJavaClassName(UNION_TYPE_CLASS_FILE_NAME_SUFFIX)));
+            generateUnionClassFile(getTypeClassJavaFileHandle(), curNode, imports);
+        }
+
+        /*
+         * Close all the file handles.
+         */
+        freeTemporaryResources(false);
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/TraversalType.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/TraversalType.java
new file mode 100644
index 0000000..dd7db35
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/TraversalType.java
@@ -0,0 +1,43 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.translator.tojava;
+
+/**
+ * Represents data model tree traversal types.
+ */
+public enum TraversalType {
+
+    /**
+     * Start of traversal at the tree root.
+     */
+    ROOT,
+
+    /**
+     * Child node traversal.
+     */
+    CHILD,
+
+    /**
+     * Sibling node traversal.
+     */
+    SIBILING,
+
+    /**
+     * Parent node traversal.
+     */
+    PARENT
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/YangDataModelFactory.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/YangDataModelFactory.java
new file mode 100644
index 0000000..4d68fe2
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/YangDataModelFactory.java
@@ -0,0 +1,409 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.yangutils.translator.tojava;
+
+import org.onosproject.yangutils.datamodel.YangAugment;
+import org.onosproject.yangutils.datamodel.YangCase;
+import org.onosproject.yangutils.datamodel.YangChoice;
+import org.onosproject.yangutils.datamodel.YangContainer;
+import org.onosproject.yangutils.datamodel.YangGrouping;
+import org.onosproject.yangutils.datamodel.YangInput;
+import org.onosproject.yangutils.datamodel.YangLeaf;
+import org.onosproject.yangutils.datamodel.YangLeafList;
+import org.onosproject.yangutils.datamodel.YangList;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangNotification;
+import org.onosproject.yangutils.datamodel.YangOutput;
+import org.onosproject.yangutils.datamodel.YangRpc;
+import org.onosproject.yangutils.datamodel.YangSubModule;
+import org.onosproject.yangutils.datamodel.YangType;
+import org.onosproject.yangutils.datamodel.YangTypeDef;
+import org.onosproject.yangutils.datamodel.YangUnion;
+import org.onosproject.yangutils.datamodel.YangUses;
+import org.onosproject.yangutils.datamodel.utils.GeneratedLanguage;
+import org.onosproject.yangutils.translator.exception.TranslatorException;
+import org.onosproject.yangutils.translator.tojava.javamodel.YangJavaAugment;
+import org.onosproject.yangutils.translator.tojava.javamodel.YangJavaCase;
+import org.onosproject.yangutils.translator.tojava.javamodel.YangJavaChoice;
+import org.onosproject.yangutils.translator.tojava.javamodel.YangJavaContainer;
+import org.onosproject.yangutils.translator.tojava.javamodel.YangJavaEnumeration;
+import org.onosproject.yangutils.translator.tojava.javamodel.YangJavaGrouping;
+import org.onosproject.yangutils.translator.tojava.javamodel.YangJavaInput;
+import org.onosproject.yangutils.translator.tojava.javamodel.YangJavaLeaf;
+import org.onosproject.yangutils.translator.tojava.javamodel.YangJavaLeafList;
+import org.onosproject.yangutils.translator.tojava.javamodel.YangJavaList;
+import org.onosproject.yangutils.translator.tojava.javamodel.YangJavaModule;
+import org.onosproject.yangutils.translator.tojava.javamodel.YangJavaNotification;
+import org.onosproject.yangutils.translator.tojava.javamodel.YangJavaOutput;
+import org.onosproject.yangutils.translator.tojava.javamodel.YangJavaRpc;
+import org.onosproject.yangutils.translator.tojava.javamodel.YangJavaSubModule;
+import org.onosproject.yangutils.translator.tojava.javamodel.YangJavaType;
+import org.onosproject.yangutils.translator.tojava.javamodel.YangJavaTypeDef;
+import org.onosproject.yangutils.translator.tojava.javamodel.YangJavaUnion;
+import org.onosproject.yangutils.translator.tojava.javamodel.YangJavaUses;
+
+/**
+ * Represents factory to create data model objects based on the target file type.
+ */
+public final class YangDataModelFactory {
+
+    /**
+     * Creates a YANG data model factory object.
+     */
+    private YangDataModelFactory() {
+    }
+
+    /**
+     * Based on the target language generate the inherited data model node.
+     *
+     * @param targetLanguage target language in which YANG mapping needs to be
+     * generated
+     * @return the corresponding inherited node based on the target language
+     */
+    public static YangModule getYangModuleNode(GeneratedLanguage targetLanguage) {
+        switch (targetLanguage) {
+            case JAVA_GENERATION: {
+                return new YangJavaModule();
+            }
+            default: {
+                throw new TranslatorException("Only YANG to Java is supported.");
+            }
+        }
+    }
+
+    /**
+     * Returns based on the target language generate the inherited data model node.
+     *
+     * @param targetLanguage target language in which YANG mapping needs to be
+     * generated
+     * @return the corresponding inherited node based on the target language
+     */
+    public static YangAugment getYangAugmentNode(GeneratedLanguage targetLanguage) {
+        switch (targetLanguage) {
+            case JAVA_GENERATION: {
+                return new YangJavaAugment();
+            }
+            default: {
+                throw new TranslatorException("Only YANG to Java is supported.");
+            }
+        }
+    }
+
+    /**
+     * Returns based on the target language generate the inherited data model node.
+     *
+     * @param targetLanguage target language in which YANG mapping needs to be
+     * generated
+     * @return the corresponding inherited node based on the target language
+     */
+    public static YangCase getYangCaseNode(GeneratedLanguage targetLanguage) {
+        switch (targetLanguage) {
+            case JAVA_GENERATION: {
+                return new YangJavaCase();
+            }
+            default: {
+                throw new TranslatorException("Only YANG to Java is supported.");
+            }
+        }
+    }
+
+    /**
+     * Returns based on the target language generate the inherited data model node.
+     *
+     * @param targetLanguage target language in which YANG mapping needs to be
+     * generated
+     * @return the corresponding inherited node based on the target language
+     */
+    public static YangChoice getYangChoiceNode(GeneratedLanguage targetLanguage) {
+        switch (targetLanguage) {
+            case JAVA_GENERATION: {
+                return new YangJavaChoice();
+            }
+            default: {
+                throw new TranslatorException("Only YANG to Java is supported.");
+            }
+        }
+    }
+
+    /**
+     * Returns based on the target language generate the inherited data model node.
+     *
+     * @param targetLanguage target language in which YANG mapping needs to be
+     * generated
+     * @return the corresponding inherited node based on the target language
+     */
+    public static YangContainer getYangContainerNode(GeneratedLanguage targetLanguage) {
+        switch (targetLanguage) {
+            case JAVA_GENERATION: {
+                return new YangJavaContainer();
+            }
+            default: {
+                throw new TranslatorException("Only YANG to Java is supported.");
+            }
+        }
+    }
+
+    /**
+     * Returns based on the target language generate the inherited data model node.
+     *
+     * @param targetLanguage target language in which YANG mapping needs to be
+     * generated
+     * @return the corresponding inherited node based on the target language
+     */
+    public static YangGrouping getYangGroupingNode(GeneratedLanguage targetLanguage) {
+        switch (targetLanguage) {
+            case JAVA_GENERATION: {
+                return new YangJavaGrouping();
+            }
+            default: {
+                throw new TranslatorException("Only YANG to Java is supported.");
+            }
+        }
+    }
+
+    /**
+     * Returns based on the target language generate the inherited data model node.
+     *
+     * @param targetLanguage target language in which YANG mapping needs to be
+     * generated
+     * @return the corresponding inherited node based on the target language
+     */
+    public static YangList getYangListNode(GeneratedLanguage targetLanguage) {
+        switch (targetLanguage) {
+            case JAVA_GENERATION: {
+                return new YangJavaList();
+            }
+            default: {
+                throw new TranslatorException("Only YANG to Java is supported.");
+            }
+        }
+    }
+
+    /**
+     * Returns based on the target language generate the inherited data model node.
+     *
+     * @param targetLanguage target language in which YANG mapping needs to be
+     * generated
+     * @return the corresponding inherited node based on the target language
+     */
+    public static YangSubModule getYangSubModuleNode(GeneratedLanguage targetLanguage) {
+        switch (targetLanguage) {
+            case JAVA_GENERATION: {
+                return new YangJavaSubModule();
+            }
+            default: {
+                throw new TranslatorException("Only YANG to Java is supported.");
+            }
+        }
+    }
+
+    /**
+     * Returns based on the target language generate the inherited data model node.
+     *
+     * @param targetLanguage target language in which YANG mapping needs to be
+     * generated
+     * @return the corresponding inherited node based on the target language
+     */
+    public static YangTypeDef getYangTypeDefNode(GeneratedLanguage targetLanguage) {
+        switch (targetLanguage) {
+            case JAVA_GENERATION: {
+                return new YangJavaTypeDef();
+            }
+            default: {
+                throw new TranslatorException("Only YANG to Java is supported.");
+            }
+        }
+    }
+
+    /**
+     * Returns based on the target language generate the inherited data model node.
+     *
+     * @param targetLanguage target language in which YANG mapping needs to be
+     * generated
+     * @return the corresponding inherited node based on the target language
+     */
+    public static YangUnion getYangUnionNode(GeneratedLanguage targetLanguage) {
+        switch (targetLanguage) {
+            case JAVA_GENERATION: {
+                return new YangJavaUnion();
+            }
+            default: {
+                throw new TranslatorException("Only YANG to Java is supported.");
+            }
+        }
+    }
+
+    /**
+     * Returns based on the target language generate the inherited data model node.
+     *
+     * @param targetLanguage target language in which YANG mapping needs to be
+     * generated
+     * @return the corresponding inherited node based on the target language
+     */
+    public static YangUses getYangUsesNode(GeneratedLanguage targetLanguage) {
+        switch (targetLanguage) {
+            case JAVA_GENERATION: {
+                return new YangJavaUses();
+            }
+            default: {
+                throw new TranslatorException("Only YANG to Java is supported.");
+            }
+        }
+    }
+
+    /**
+     * Returns based on the target language generate the inherited data model node.
+     *
+     * @param targetLanguage target language in which YANG mapping needs to be
+     * generated
+     * @return the corresponding inherited node based on the target language
+     */
+    public static YangNotification getYangNotificationNode(GeneratedLanguage targetLanguage) {
+        switch (targetLanguage) {
+            case JAVA_GENERATION: {
+                return new YangJavaNotification();
+            }
+            default: {
+                throw new TranslatorException("Only YANG to Java is supported.");
+            }
+        }
+    }
+
+    /**
+     * Returns based on the target language generate the inherited data model node.
+     *
+     * @param targetLanguage target language in which YANG mapping needs to be
+     * generated
+     * @return the corresponding inherited node based on the target language
+     */
+    public static YangLeaf getYangLeaf(GeneratedLanguage targetLanguage) {
+        switch (targetLanguage) {
+            case JAVA_GENERATION: {
+                return new YangJavaLeaf();
+            }
+            default: {
+                throw new RuntimeException("Only YANG to Java is supported.");
+            }
+        }
+    }
+
+    /**
+     * Returns based on the target language generate the inherited data model node.
+     *
+     * @param targetLanguage target language in which YANG mapping needs to be
+     * generated
+     * @return the corresponding inherited node based on the target language
+     */
+    public static YangLeafList getYangLeafList(GeneratedLanguage targetLanguage) {
+        switch (targetLanguage) {
+            case JAVA_GENERATION: {
+                return new YangJavaLeafList();
+            }
+            default: {
+                throw new RuntimeException("Only YANG to Java is supported.");
+            }
+        }
+    }
+
+    /**
+     * Returns based on the target language generate the inherited data model node.
+     *
+     * @param targetLanguage target language in which YANG mapping needs to be
+     * generated
+     * @return the corresponding inherited node based on the target language
+     */
+    public static YangRpc getYangRpcNode(GeneratedLanguage targetLanguage) {
+        switch (targetLanguage) {
+            case JAVA_GENERATION: {
+                return new YangJavaRpc();
+            }
+            default: {
+                throw new TranslatorException("Only YANG to Java is supported.");
+            }
+        }
+    }
+
+    /**
+     * Returns based on the target language generate the inherited data model node.
+     *
+     * @param targetLanguage target language in which YANG mapping needs to be
+     * generated
+     * @return the corresponding inherited node based on the target language
+     */
+    public static YangInput getYangInputNode(GeneratedLanguage targetLanguage) {
+        switch (targetLanguage) {
+            case JAVA_GENERATION: {
+                return new YangJavaInput();
+            }
+            default: {
+                throw new TranslatorException("Only YANG to Java is supported.");
+            }
+        }
+    }
+
+    /**
+     * Returns based on the target language generate the inherited data model node.
+     *
+     * @param targetLanguage target language in which YANG mapping needs to be
+     * generated
+     * @return the corresponding inherited node based on the target language
+     */
+    public static YangOutput getYangOutputNode(GeneratedLanguage targetLanguage) {
+        switch (targetLanguage) {
+            case JAVA_GENERATION: {
+                return new YangJavaOutput();
+            }
+            default: {
+                throw new TranslatorException("Only YANG to Java is supported.");
+            }
+        }
+    }
+
+    /**
+     * Returns based on the target language generate the inherited data model node.
+     *
+     * @param targetLanguage target language in which YANG mapping needs to be
+     * generated
+     * @return the corresponding inherited node based on the target language
+     */
+    public static YangJavaEnumeration getYangEnumerationNode(GeneratedLanguage targetLanguage) {
+        switch (targetLanguage) {
+            case JAVA_GENERATION: {
+                return new YangJavaEnumeration();
+            }
+            default: {
+                throw new TranslatorException("Only YANG to Java is supported.");
+            }
+        }
+    }
+    /**
+     * Returns based on the target language generate the inherited data model node.
+     *
+     * @param targetLanguage target language in which YANG mapping needs to be
+     * generated
+     * @return the corresponding inherited node based on the target language
+     */
+    public static YangType getYangType(GeneratedLanguage targetLanguage) {
+        switch (targetLanguage) {
+            case JAVA_GENERATION: {
+                return new YangJavaType();
+            }
+            default: {
+                throw new RuntimeException("Only YANG to Java is supported.");
+            }
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/JavaCodeGeneratorInfo.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/JavaCodeGeneratorInfo.java
new file mode 100644
index 0000000..8dc0db5
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/JavaCodeGeneratorInfo.java
@@ -0,0 +1,30 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.translator.tojava.javamodel;
+
+import org.onosproject.yangutils.translator.tojava.JavaFileInfoContainer;
+import org.onosproject.yangutils.translator.tojava.TempJavaCodeFragmentFilesContainer;
+
+/**
+ * Represents YANG java info containing interface for java code generator, java
+ * file information, java import data and temp java code fragment files. This
+ * interface serves as a generic interface and help to unify the generate code
+ * entry function.
+ */
+public interface JavaCodeGeneratorInfo
+        extends JavaFileInfoContainer, TempJavaCodeFragmentFilesContainer {
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/JavaLeafInfoContainer.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/JavaLeafInfoContainer.java
new file mode 100644
index 0000000..3722ad3
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/JavaLeafInfoContainer.java
@@ -0,0 +1,75 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.yangutils.translator.tojava.javamodel;
+
+import org.onosproject.yangutils.datamodel.YangType;
+import org.onosproject.yangutils.translator.tojava.JavaQualifiedTypeInfoContainer;
+import org.onosproject.yangutils.translator.tojava.utils.YangToJavaNamingConflictUtil;
+
+/**
+ * Represent java based identification of the YANG leaves.
+ */
+public interface JavaLeafInfoContainer
+        extends JavaQualifiedTypeInfoContainer {
+    /**
+     * Retreives the data type of the leaf.
+     *
+     * @return data type of the leaf
+     */
+    YangType<?> getDataType();
+
+    /**
+     * Retreives the name of the leaf.
+     *
+     * @return name of the leaf
+     */
+    String getName();
+
+    /**
+     * Retreives the java name of the leaf.
+     *
+     * @param conflictResolveConfig user config to resolve conflicts
+     * @return name of the leaf
+     */
+    String getJavaName(YangToJavaNamingConflictUtil conflictResolveConfig);
+
+    /**
+     * Identifies if object is a leaf-list.
+     *
+     * @return true if leaf-list false otherwise
+     */
+    boolean isLeafList();
+
+    /**
+     * updates the qualified info.
+     */
+    void updateJavaQualifiedInfo();
+
+    /**
+     * Returns java naming conflict resolver.
+     *
+     * @return  java naming conflict resolver
+     */
+    YangToJavaNamingConflictUtil getConflictResolveConfig();
+
+    /**
+     * Sets  java naming conflict resolver.
+     *
+     * @param conflictResolveConfig  java naming conflict resolver
+     */
+    void setConflictResolveConfig(YangToJavaNamingConflictUtil conflictResolveConfig);
+
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/JavaQualifiedTypeResolver.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/JavaQualifiedTypeResolver.java
new file mode 100644
index 0000000..5b1e7c5
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/JavaQualifiedTypeResolver.java
@@ -0,0 +1,33 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.yangutils.translator.tojava.javamodel;
+
+import org.onosproject.yangutils.translator.tojava.JavaQualifiedTypeInfoContainer;
+import org.onosproject.yangutils.translator.tojava.utils.YangToJavaNamingConflictUtil;
+
+/**
+ * Represent java based identification of the YANG leaves.
+ */
+public interface JavaQualifiedTypeResolver
+        extends JavaQualifiedTypeInfoContainer {
+
+    /**
+     * updates the qualified access details of the type.
+     *
+     * @param confilictResolver plugin configurations
+     */
+    void updateJavaQualifiedInfo(YangToJavaNamingConflictUtil confilictResolver);
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/YangJavaAugment.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/YangJavaAugment.java
new file mode 100644
index 0000000..6ac0fb7
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/YangJavaAugment.java
@@ -0,0 +1,132 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.yangutils.translator.tojava.javamodel;
+
+import java.io.IOException;
+
+import org.onosproject.yangutils.datamodel.YangAugment;
+import org.onosproject.yangutils.translator.exception.TranslatorException;
+import org.onosproject.yangutils.translator.tojava.JavaCodeGenerator;
+import org.onosproject.yangutils.translator.tojava.JavaFileInfo;
+import org.onosproject.yangutils.translator.tojava.TempJavaCodeFragmentFiles;
+import org.onosproject.yangutils.translator.tojava.utils.YangPluginConfig;
+
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.GENERATE_INTERFACE_WITH_BUILDER;
+import static org.onosproject.yangutils.translator.tojava.utils.YangJavaModelUtils.generateCodeOfAugmentableNode;
+
+/**
+ * Represents augment information extended to support java code generation.
+ */
+public class YangJavaAugment
+        extends YangAugment
+        implements JavaCodeGeneratorInfo, JavaCodeGenerator {
+
+    private static final long serialVersionUID = 806201632L;
+
+    /**
+     * Contains the information of the java file being generated.
+     */
+    private JavaFileInfo javaFileInfo;
+
+    /**
+     * File handle to maintain temporary java code fragments as per the code
+     * snippet types.
+     */
+    private transient TempJavaCodeFragmentFiles tempFileHandle;
+
+    /**
+     * Creates a YANG java augment object.
+     */
+    public YangJavaAugment() {
+        super();
+        setJavaFileInfo(new JavaFileInfo());
+        getJavaFileInfo().setGeneratedFileTypes(GENERATE_INTERFACE_WITH_BUILDER);
+    }
+
+    /**
+     * Returns the generated java file information.
+     *
+     * @return generated java file information
+     */
+    @Override
+    public JavaFileInfo getJavaFileInfo() {
+
+        if (javaFileInfo == null) {
+            throw new TranslatorException("Missing java info in java datamodel node");
+        }
+        return javaFileInfo;
+    }
+
+    /**
+     * Sets the java file info object.
+     *
+     * @param javaInfo java file info object
+     */
+    @Override
+    public void setJavaFileInfo(JavaFileInfo javaInfo) {
+        javaFileInfo = javaInfo;
+    }
+
+    /**
+     * Returns the temporary file handle.
+     *
+     * @return temporary file handle
+     */
+    @Override
+    public TempJavaCodeFragmentFiles getTempJavaCodeFragmentFiles() {
+        return tempFileHandle;
+    }
+
+    /**
+     * Sets temporary file handle.
+     *
+     * @param fileHandle temporary file handle
+     */
+    @Override
+    public void setTempJavaCodeFragmentFiles(TempJavaCodeFragmentFiles fileHandle) {
+        tempFileHandle = fileHandle;
+    }
+
+    /**
+     * Prepare the information for java code generation corresponding to YANG
+     * augment info.
+     *
+     * @param yangPlugin YANG plugin config
+     * @throws TranslatorException translator operation fail
+     */
+    @Override
+    public void generateCodeEntry(YangPluginConfig yangPlugin) throws TranslatorException {
+        try {
+            generateCodeOfAugmentableNode(this, yangPlugin);
+        } catch (IOException e) {
+            throw new TranslatorException("Failed to generate code for augmentable node " + getName());
+        }
+    }
+
+    /**
+     * Create a java file using the YANG augment info.
+     *
+     * @throws TranslatorException when failed to do translator operations
+     */
+    @Override
+    public void generateCodeExit() throws TranslatorException {
+        try {
+            getTempJavaCodeFragmentFiles().generateJavaFile(GENERATE_INTERFACE_WITH_BUILDER, this);
+        } catch (IOException e) {
+            throw new TranslatorException("Failed to generate code for augmentable node " + getName());
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/YangJavaCase.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/YangJavaCase.java
new file mode 100644
index 0000000..ba7bd01
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/YangJavaCase.java
@@ -0,0 +1,130 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.yangutils.translator.tojava.javamodel;
+
+import java.io.IOException;
+
+import org.onosproject.yangutils.datamodel.YangCase;
+import org.onosproject.yangutils.translator.exception.TranslatorException;
+import org.onosproject.yangutils.translator.tojava.JavaCodeGenerator;
+import org.onosproject.yangutils.translator.tojava.JavaFileInfo;
+import org.onosproject.yangutils.translator.tojava.TempJavaCodeFragmentFiles;
+import org.onosproject.yangutils.translator.tojava.utils.YangPluginConfig;
+
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.GENERATE_INTERFACE_WITH_BUILDER;
+import static org.onosproject.yangutils.translator.tojava.utils.YangJavaModelUtils.generateCodeOfAugmentableNode;
+
+/**
+ * Represents case information extended to support java code generation.
+ */
+public class YangJavaCase
+        extends YangCase
+        implements JavaCodeGeneratorInfo, JavaCodeGenerator {
+
+    private static final long serialVersionUID = 806201631L;
+
+    /**
+     * Contains the information of the java file being generated.
+     */
+    private JavaFileInfo javaFileInfo;
+
+    /**
+     * File handle to maintain temporary java code fragments as per the code
+     * snippet types.
+     */
+    private transient TempJavaCodeFragmentFiles tempFileHandle;
+
+    /**
+     * Creates YANG java case object.
+     */
+    public YangJavaCase() {
+        super();
+        setJavaFileInfo(new JavaFileInfo());
+        getJavaFileInfo().setGeneratedFileTypes(GENERATE_INTERFACE_WITH_BUILDER);
+    }
+
+    /**
+     * Returns the generated java file information.
+     *
+     * @return generated java file information
+     */
+    @Override
+    public JavaFileInfo getJavaFileInfo() {
+        if (javaFileInfo == null) {
+            throw new TranslatorException("Missing java info in java datamodel node");
+        }
+        return javaFileInfo;
+    }
+
+    /**
+     * Sets the java file info object.
+     *
+     * @param javaInfo java file info object
+     */
+    @Override
+    public void setJavaFileInfo(JavaFileInfo javaInfo) {
+        javaFileInfo = javaInfo;
+    }
+
+    /**
+     * Returns the temporary file handle.
+     *
+     * @return temporary file handle
+     */
+    @Override
+    public TempJavaCodeFragmentFiles getTempJavaCodeFragmentFiles() {
+        return tempFileHandle;
+    }
+
+    /**
+     * Sets temporary file handle.
+     *
+     * @param fileHandle temporary file handle
+     */
+    @Override
+    public void setTempJavaCodeFragmentFiles(TempJavaCodeFragmentFiles fileHandle) {
+        tempFileHandle = fileHandle;
+    }
+
+    /**
+     * Prepare the information for java code generation corresponding to YANG
+     * case info.
+     *
+     * @param yangPlugin YANG plugin config
+     * @throws TranslatorException translator operation fail
+     */
+    @Override
+    public void generateCodeEntry(YangPluginConfig yangPlugin) throws TranslatorException {
+        try {
+            generateCodeOfAugmentableNode(this, yangPlugin);
+        } catch (IOException e) {
+            throw new TranslatorException(
+                    "Failed to prepare generate code entry for case node " + getName());
+        }
+    }
+
+    /**
+     * Creates a java file using the YANG case info.
+     */
+    @Override
+    public void generateCodeExit() throws TranslatorException {
+        try {
+            getTempJavaCodeFragmentFiles().generateJavaFile(GENERATE_INTERFACE_WITH_BUILDER, this);
+        } catch (IOException e) {
+            throw new TranslatorException("Failed to generate code for case node " + getName());
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/YangJavaChoice.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/YangJavaChoice.java
new file mode 100644
index 0000000..4096972
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/YangJavaChoice.java
@@ -0,0 +1,130 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.yangutils.translator.tojava.javamodel;
+
+import java.io.IOException;
+
+import org.onosproject.yangutils.datamodel.YangChoice;
+import org.onosproject.yangutils.translator.exception.TranslatorException;
+import org.onosproject.yangutils.translator.tojava.JavaCodeGenerator;
+import org.onosproject.yangutils.translator.tojava.JavaFileInfo;
+import org.onosproject.yangutils.translator.tojava.TempJavaCodeFragmentFiles;
+import org.onosproject.yangutils.translator.tojava.utils.YangPluginConfig;
+
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.INTERFACE_MASK;
+import static org.onosproject.yangutils.translator.tojava.utils.YangJavaModelUtils.generateCodeAndUpdateInParent;
+
+/**
+ * Represents choice information extended to support java code generation.
+ */
+public class YangJavaChoice
+        extends YangChoice
+        implements JavaCodeGeneratorInfo, JavaCodeGenerator {
+
+    private static final long serialVersionUID = 806201631L;
+
+    /**
+     * Contains the information of the java file being generated.
+     */
+    private JavaFileInfo javaFileInfo;
+
+    /**
+     * File handle to maintain temporary java code fragments as per the code
+     * snippet types.
+     */
+    private transient TempJavaCodeFragmentFiles tempFileHandle;
+
+    /**
+     * Creates YANG java choice object.
+     */
+    public YangJavaChoice() {
+        super();
+        setJavaFileInfo(new JavaFileInfo());
+        getJavaFileInfo().setGeneratedFileTypes(INTERFACE_MASK);
+    }
+
+    /**
+     * Returns the generated java file information.
+     *
+     * @return generated java file information
+     */
+    @Override
+    public JavaFileInfo getJavaFileInfo() {
+        if (javaFileInfo == null) {
+            throw new TranslatorException("Missing java info in java datamodel node");
+        }
+        return javaFileInfo;
+    }
+
+    /**
+     * Sets the java file info object.
+     *
+     * @param javaInfo java file info object
+     */
+    @Override
+    public void setJavaFileInfo(JavaFileInfo javaInfo) {
+        javaFileInfo = javaInfo;
+    }
+
+    /**
+     * Returns the temporary file handle.
+     *
+     * @return temporary file handle
+     */
+    @Override
+    public TempJavaCodeFragmentFiles getTempJavaCodeFragmentFiles() {
+        return tempFileHandle;
+    }
+
+    /**
+     * Sets temporary file handle.
+     *
+     * @param fileHandle temporary file handle
+     */
+    @Override
+    public void setTempJavaCodeFragmentFiles(TempJavaCodeFragmentFiles fileHandle) {
+        tempFileHandle = fileHandle;
+    }
+
+    /**
+     * Prepare the information for java code generation corresponding to YANG
+     * choice info.
+     *
+     * @param yangPlugin YANG plugin config
+     * @throws TranslatorException translator operation fail
+     */
+    @Override
+    public void generateCodeEntry(YangPluginConfig yangPlugin) throws TranslatorException {
+        try {
+            generateCodeAndUpdateInParent(this, yangPlugin, false);
+        } catch (IOException e) {
+            throw new TranslatorException(
+                    "Failed to prepare generate code entry for choice node " + getName());
+        }
+    }
+
+    /**
+     * Creates a java file using the YANG choice info.
+     */
+    @Override
+    public void generateCodeExit() throws TranslatorException {
+        try {
+            getTempJavaCodeFragmentFiles().generateJavaFile(INTERFACE_MASK, this);
+        } catch (IOException e) {
+            throw new TranslatorException("Failed to generate code for choice node " + getName());
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/YangJavaContainer.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/YangJavaContainer.java
new file mode 100644
index 0000000..c056632
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/YangJavaContainer.java
@@ -0,0 +1,133 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.yangutils.translator.tojava.javamodel;
+
+import java.io.IOException;
+
+import org.onosproject.yangutils.datamodel.YangContainer;
+import org.onosproject.yangutils.translator.exception.TranslatorException;
+import org.onosproject.yangutils.translator.tojava.JavaCodeGenerator;
+import org.onosproject.yangutils.translator.tojava.JavaFileInfo;
+import org.onosproject.yangutils.translator.tojava.TempJavaCodeFragmentFiles;
+import org.onosproject.yangutils.translator.tojava.utils.YangPluginConfig;
+
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.GENERATE_INTERFACE_WITH_BUILDER;
+import static org.onosproject.yangutils.translator.tojava.utils.YangJavaModelUtils.generateCodeAndUpdateInParent;
+
+/**
+ * Represents container information extended to support java code generation.
+ */
+public class YangJavaContainer
+        extends YangContainer
+        implements JavaCodeGeneratorInfo, JavaCodeGenerator {
+
+    private static final long serialVersionUID = 806201630L;
+
+    /**
+     * Contains the information of the java file being generated.
+     */
+    private JavaFileInfo javaFileInfo;
+
+    /**
+     * File handle to maintain temporary java code fragments as per the code
+     * snippet types.
+     */
+    private transient TempJavaCodeFragmentFiles tempFileHandle;
+
+    /**
+     * Creates YANG java container object.
+     */
+    public YangJavaContainer() {
+        super();
+        setJavaFileInfo(new JavaFileInfo());
+        getJavaFileInfo().setGeneratedFileTypes(GENERATE_INTERFACE_WITH_BUILDER);
+    }
+
+    /**
+     * Returns the generated java file information.
+     *
+     * @return generated java file information
+     */
+    @Override
+    public JavaFileInfo getJavaFileInfo() {
+        if (javaFileInfo == null) {
+            throw new TranslatorException("Missing java info in java datamodel node");
+        }
+        return javaFileInfo;
+    }
+
+    /**
+     * Sets the java file info object.
+     *
+     * @param javaInfo java file info object
+     */
+    @Override
+    public void setJavaFileInfo(JavaFileInfo javaInfo) {
+        javaFileInfo = javaInfo;
+    }
+
+    /**
+     * Returns the temporary file handle.
+     *
+     * @return temporary file handle
+     */
+    @Override
+    public TempJavaCodeFragmentFiles getTempJavaCodeFragmentFiles() {
+        return tempFileHandle;
+    }
+
+    /**
+     * Sets temporary file handle.
+     *
+     * @param fileHandle temporary file handle
+     */
+    @Override
+    public void setTempJavaCodeFragmentFiles(TempJavaCodeFragmentFiles fileHandle) {
+        tempFileHandle = fileHandle;
+    }
+
+    /**
+     * Prepare the information for java code generation corresponding to YANG
+     * container info.
+     *
+     * @param yangPlugin YANG plugin config
+     * @throws TranslatorException translator operation fail
+     */
+    @Override
+    public void generateCodeEntry(YangPluginConfig yangPlugin) throws TranslatorException {
+        try {
+            generateCodeAndUpdateInParent(this, yangPlugin, false);
+        } catch (IOException e) {
+            throw new TranslatorException(
+                    "Failed to prepare generate code entry for container node " + getName());
+        }
+    }
+
+    /**
+     * Create a java file using the YANG container info.
+     *
+     * @throws TranslatorException translator operation fail
+     */
+    @Override
+    public void generateCodeExit() throws TranslatorException {
+        try {
+            getTempJavaCodeFragmentFiles().generateJavaFile(GENERATE_INTERFACE_WITH_BUILDER, this);
+        } catch (IOException e) {
+            throw new TranslatorException("Failed to generate code for container node " + getName());
+        }
+    }
+
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/YangJavaEnumeration.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/YangJavaEnumeration.java
new file mode 100644
index 0000000..16cabc2
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/YangJavaEnumeration.java
@@ -0,0 +1,135 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.translator.tojava.javamodel;
+
+import java.io.IOException;
+
+import org.onosproject.yangutils.datamodel.YangEnumeration;
+import org.onosproject.yangutils.translator.exception.TranslatorException;
+import org.onosproject.yangutils.translator.tojava.JavaCodeGenerator;
+import org.onosproject.yangutils.translator.tojava.JavaFileInfo;
+import org.onosproject.yangutils.translator.tojava.TempJavaCodeFragmentFiles;
+import org.onosproject.yangutils.translator.tojava.utils.YangPluginConfig;
+
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.GENERATE_ENUM_CLASS;
+import static org.onosproject.yangutils.translator.tojava.utils.YangJavaModelUtils.generateCodeOfNode;
+
+/**
+ * Represents YANG java enumeration information extended to support java code generation.
+ */
+public class YangJavaEnumeration
+        extends YangEnumeration
+        implements JavaCodeGenerator, JavaCodeGeneratorInfo {
+
+    private static final long serialVersionUID = 806201629L;
+
+    /**
+     * Contains the information of the java file being generated.
+     */
+    private JavaFileInfo javaFileInfo;
+
+    /**
+     * File handle to maintain temporary java code fragments as per the code
+     * snippet types.
+     */
+    private transient TempJavaCodeFragmentFiles tempFileHandle;
+
+    /**
+     * Creates YANG java enumeration object.
+     */
+    public YangJavaEnumeration() {
+        super();
+        setJavaFileInfo(new JavaFileInfo());
+        getJavaFileInfo().setGeneratedFileTypes(GENERATE_ENUM_CLASS);
+    }
+
+    /**
+     * Returns the generated java file information.
+     *
+     * @return generated java file information
+     */
+    @Override
+    public JavaFileInfo getJavaFileInfo() {
+
+        if (javaFileInfo == null) {
+            throw new TranslatorException("Missing java info in java datamodel node");
+        }
+        return javaFileInfo;
+    }
+
+    /**
+     * Sets the java file info object.
+     *
+     * @param javaInfo java file info object
+     */
+    @Override
+    public void setJavaFileInfo(JavaFileInfo javaInfo) {
+        javaFileInfo = javaInfo;
+    }
+
+    /**
+     * Returns the temporary file handle.
+     *
+     * @return temporary file handle
+     */
+    @Override
+    public TempJavaCodeFragmentFiles getTempJavaCodeFragmentFiles() {
+        return tempFileHandle;
+    }
+
+    /**
+     * Sets temporary file handle.
+     *
+     * @param fileHandle temporary file handle
+     */
+    @Override
+    public void setTempJavaCodeFragmentFiles(TempJavaCodeFragmentFiles fileHandle) {
+        tempFileHandle = fileHandle;
+    }
+
+    /**
+     * Prepare the information for java code generation corresponding to YANG
+     * enumeration info.
+     *
+     * @param yangPlugin YANG plugin config
+     * @throws TranslatorException translator operations fails
+     */
+    @Override
+    public void generateCodeEntry(YangPluginConfig yangPlugin) throws TranslatorException {
+        try {
+            generateCodeOfNode(this, yangPlugin);
+        } catch (IOException e) {
+            throw new TranslatorException(
+                    "Failed to prepare generate code entry for enumeration node " + getName());
+        }
+    }
+
+    /**
+     * Creates a java file using the YANG enumeration info.
+     *
+     * @throws TranslatorException translator operation fail
+     */
+    @Override
+    public void generateCodeExit() throws TranslatorException {
+        try {
+            getTempJavaCodeFragmentFiles().generateJavaFile(GENERATE_ENUM_CLASS, this);
+        } catch (IOException e) {
+            throw new TranslatorException("Failed to generate code for enumeration node " + getName());
+        }
+    }
+
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/YangJavaGrouping.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/YangJavaGrouping.java
new file mode 100644
index 0000000..8a90a44
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/YangJavaGrouping.java
@@ -0,0 +1,118 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.yangutils.translator.tojava.javamodel;
+
+import java.io.IOException;
+
+import org.onosproject.yangutils.datamodel.YangGrouping;
+import org.onosproject.yangutils.translator.exception.TranslatorException;
+import org.onosproject.yangutils.translator.tojava.JavaCodeGenerator;
+import org.onosproject.yangutils.translator.tojava.JavaFileInfo;
+import org.onosproject.yangutils.translator.tojava.TempJavaCodeFragmentFiles;
+import org.onosproject.yangutils.translator.tojava.utils.YangPluginConfig;
+
+import static org.onosproject.yangutils.translator.tojava.utils.YangJavaModelUtils.updatePackageInfo;
+
+/**
+ * Represents grouping information extended to support java code generation.
+ */
+public class YangJavaGrouping
+        extends YangGrouping
+        implements JavaCodeGeneratorInfo, JavaCodeGenerator {
+
+    private static final long serialVersionUID = 806201628L;
+
+    /**
+     * Contains the information of the java file being generated.
+     */
+    private JavaFileInfo javaFileInfo;
+
+    /**
+     * File handle to maintain temporary java code fragments as per the code
+     * snippet types.
+     */
+    private transient TempJavaCodeFragmentFiles tempFileHandle;
+
+    /**
+     * Creates YANG Java grouping object.
+     */
+    public YangJavaGrouping() {
+        super();
+        setJavaFileInfo(new JavaFileInfo());
+    }
+
+    /**
+     * Returns the generated java file information.
+     *
+     * @return generated java file information
+     */
+    @Override
+    public JavaFileInfo getJavaFileInfo() {
+        if (javaFileInfo == null) {
+            throw new TranslatorException("Missing java info in java datamodel node");
+        }
+        return javaFileInfo;
+    }
+
+    /**
+     * Sets the java file info object.
+     *
+     * @param javaInfo java file info object
+     */
+    @Override
+    public void setJavaFileInfo(JavaFileInfo javaInfo) {
+        javaFileInfo = javaInfo;
+    }
+
+    /**
+     * Returns the temporary file handle.
+     *
+     * @return temporary file handle
+     */
+    @Override
+    public TempJavaCodeFragmentFiles getTempJavaCodeFragmentFiles() {
+        return tempFileHandle;
+    }
+
+    /**
+     * Sets temporary file handle.
+     *
+     * @param fileHandle temporary file handle
+     */
+    @Override
+    public void setTempJavaCodeFragmentFiles(TempJavaCodeFragmentFiles fileHandle) {
+        tempFileHandle = fileHandle;
+    }
+
+
+    @Override
+    public void generateCodeEntry(YangPluginConfig yangPlugin)
+            throws TranslatorException {
+        try {
+            updatePackageInfo(this, yangPlugin);
+        } catch (IOException e) {
+            throw new TranslatorException(e.getCause());
+        }
+    }
+
+    @Override
+    public void generateCodeExit()
+            throws TranslatorException {
+        /*
+         * Do nothing.
+         */
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/YangJavaInput.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/YangJavaInput.java
new file mode 100644
index 0000000..db59174
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/YangJavaInput.java
@@ -0,0 +1,134 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.translator.tojava.javamodel;
+
+import java.io.IOException;
+
+import org.onosproject.yangutils.datamodel.YangInput;
+import org.onosproject.yangutils.translator.exception.TranslatorException;
+import org.onosproject.yangutils.translator.tojava.JavaCodeGenerator;
+import org.onosproject.yangutils.translator.tojava.JavaFileInfo;
+import org.onosproject.yangutils.translator.tojava.TempJavaCodeFragmentFiles;
+import org.onosproject.yangutils.translator.tojava.utils.YangPluginConfig;
+
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.GENERATE_INTERFACE_WITH_BUILDER;
+import static org.onosproject.yangutils.translator.tojava.utils.YangJavaModelUtils.generateCodeOfAugmentableNode;
+
+/**
+ * Represents input information extended to support java code generation.
+ */
+public class YangJavaInput
+        extends YangInput
+        implements JavaCodeGeneratorInfo, JavaCodeGenerator {
+
+    private static final long serialVersionUID = 806201627L;
+
+    /**
+     * Contains information of the java file being generated.
+     */
+    private JavaFileInfo javaFileInfo;
+
+    /**
+     * File handle to maintain temporary java code fragments as per the code
+     * snippet types.
+     */
+    private transient TempJavaCodeFragmentFiles tempFileHandle;
+
+    /**
+     * Creates an instance of java input.
+     */
+    public YangJavaInput() {
+        super();
+        setJavaFileInfo(new JavaFileInfo());
+        getJavaFileInfo().setGeneratedFileTypes(GENERATE_INTERFACE_WITH_BUILDER);
+    }
+
+    /**
+     * Returns the generated java file information.
+     *
+     * @return generated java file information
+     */
+    @Override
+    public JavaFileInfo getJavaFileInfo() {
+        if (javaFileInfo == null) {
+            throw new TranslatorException("missing java info in java datamodel node");
+        }
+        return javaFileInfo;
+    }
+
+    /**
+     * Sets the java file info object.
+     *
+     * @param javaInfo java file info object
+     */
+    @Override
+    public void setJavaFileInfo(JavaFileInfo javaInfo) {
+        javaFileInfo = javaInfo;
+    }
+
+    /**
+     * Returns the temporary file handle.
+     *
+     * @return temporary file handle
+     */
+    @Override
+    public TempJavaCodeFragmentFiles getTempJavaCodeFragmentFiles() {
+        return tempFileHandle;
+    }
+
+    /**
+     * Sets temporary file handle.
+     *
+     * @param fileHandle temporary file handle
+     */
+    @Override
+    public void setTempJavaCodeFragmentFiles(TempJavaCodeFragmentFiles fileHandle) {
+        tempFileHandle = fileHandle;
+    }
+
+    /**
+     * Prepare the information for java code generation corresponding to YANG
+     * input info.
+     *
+     * @param yangPlugin YANG plugin config
+     * @throws TranslatorException translator operation fail
+     */
+    @Override
+    public void generateCodeEntry(YangPluginConfig yangPlugin) throws TranslatorException {
+        try {
+            generateCodeOfAugmentableNode(this, yangPlugin);
+        } catch (IOException e) {
+            throw new TranslatorException(
+                    "Failed to prepare generate code entry for input node " + getName());
+        }
+    }
+
+    /**
+     * Creates a java file using the YANG input info.
+     *
+     * @throws TranslatorException translator operation fail
+     */
+    @Override
+    public void generateCodeExit() throws TranslatorException {
+        try {
+            getTempJavaCodeFragmentFiles().generateJavaFile(GENERATE_INTERFACE_WITH_BUILDER, this);
+        } catch (IOException e) {
+            throw new TranslatorException("Failed to generate code for input node " + getName());
+        }
+    }
+
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/YangJavaLeaf.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/YangJavaLeaf.java
new file mode 100644
index 0000000..9f39dce
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/YangJavaLeaf.java
@@ -0,0 +1,91 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.yangutils.translator.tojava.javamodel;
+
+import org.onosproject.yangutils.datamodel.YangLeaf;
+import org.onosproject.yangutils.translator.tojava.JavaQualifiedTypeInfo;
+import org.onosproject.yangutils.translator.tojava.utils.YangToJavaNamingConflictUtil;
+
+import static org.onosproject.yangutils.translator.tojava.JavaQualifiedTypeInfo.updateLeavesJavaQualifiedInfo;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaIdentifierSyntax.getCamelCase;
+
+/**
+ * Represents java information corresponding to the YANG leaf.
+ */
+public class YangJavaLeaf
+        extends YangLeaf
+        implements JavaLeafInfoContainer {
+
+    private static final long serialVersionUID = 806201636L;
+
+    private JavaQualifiedTypeInfo javaQualifiedAccess;
+    private transient YangToJavaNamingConflictUtil conflictResolveConfig;
+
+    /**
+     * Returns a new YANG leaf object with java qualified access details.
+     */
+    public YangJavaLeaf() {
+        super();
+        setJavaQualifiedInfo(new JavaQualifiedTypeInfo());
+    }
+
+    @Override
+    public JavaQualifiedTypeInfo getJavaQualifiedInfo() {
+        return javaQualifiedAccess;
+    }
+
+    @Override
+    public void setJavaQualifiedInfo(JavaQualifiedTypeInfo typeInfo) {
+        javaQualifiedAccess = typeInfo;
+
+    }
+
+    @Override
+    public String getJavaName(YangToJavaNamingConflictUtil conflictResolveConfig) {
+        return getCamelCase(getName(), conflictResolveConfig);
+    }
+
+    @Override
+    public boolean isLeafList() {
+        return false;
+    }
+
+    @Override
+    public void updateJavaQualifiedInfo() {
+        updateLeavesJavaQualifiedInfo(this);
+    }
+
+    /**
+     * Returns java naming conflict resolve configurations.
+     *
+     * @return java naming conflict resolve configurations
+     */
+    @Override
+    public YangToJavaNamingConflictUtil getConflictResolveConfig() {
+        return conflictResolveConfig;
+    }
+
+    /**
+     * Sets java naming conflict resolve configurations.
+     *
+     * @param conflictResolveConfig java naming conflict resolve configurations
+     */
+    @Override
+    public void setConflictResolveConfig(YangToJavaNamingConflictUtil conflictResolveConfig) {
+        this.conflictResolveConfig = conflictResolveConfig;
+    }
+
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/YangJavaLeafList.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/YangJavaLeafList.java
new file mode 100644
index 0000000..91c550f
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/YangJavaLeafList.java
@@ -0,0 +1,89 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.yangutils.translator.tojava.javamodel;
+
+import org.onosproject.yangutils.datamodel.YangLeafList;
+import org.onosproject.yangutils.translator.tojava.JavaQualifiedTypeInfo;
+import org.onosproject.yangutils.translator.tojava.utils.YangToJavaNamingConflictUtil;
+
+import static org.onosproject.yangutils.translator.tojava.JavaQualifiedTypeInfo.updateLeavesJavaQualifiedInfo;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaIdentifierSyntax.getCamelCase;
+
+/**
+ * Represents java information corresponding to the YANG leaf-list.
+ */
+public class YangJavaLeafList
+        extends YangLeafList
+        implements JavaLeafInfoContainer {
+
+    private static final long serialVersionUID = 806201638L;
+
+    private JavaQualifiedTypeInfo javaQualifiedAccess;
+    private transient YangToJavaNamingConflictUtil conflictResolveConfig;
+
+    /**
+     * Returns a new YANG leaf object with java qualified access details.
+     */
+    public YangJavaLeafList() {
+        super();
+        setJavaQualifiedInfo(new JavaQualifiedTypeInfo());
+    }
+
+    @Override
+    public String getJavaName(YangToJavaNamingConflictUtil conflictResolveConfig) {
+        return getCamelCase(getName(), conflictResolveConfig);
+    }
+
+    @Override
+    public boolean isLeafList() {
+        return true;
+    }
+
+    @Override
+    public void updateJavaQualifiedInfo() {
+        updateLeavesJavaQualifiedInfo(this);
+    }
+
+    @Override
+    public JavaQualifiedTypeInfo getJavaQualifiedInfo() {
+        return javaQualifiedAccess;
+    }
+
+    @Override
+    public void setJavaQualifiedInfo(JavaQualifiedTypeInfo typeInfo) {
+        javaQualifiedAccess = typeInfo;
+    }
+
+    /**
+     * Returns java naming conflict resolve configurations.
+     *
+     * @return java naming conflict resolve configurations
+     */
+    @Override
+    public YangToJavaNamingConflictUtil getConflictResolveConfig() {
+        return conflictResolveConfig;
+    }
+
+    /**
+     * Sets java naming conflict resolve configurations.
+     *
+     * @param conflictResolveConfig java naming conflict resolve configurations
+     */
+    @Override
+    public void setConflictResolveConfig(YangToJavaNamingConflictUtil conflictResolveConfig) {
+        this.conflictResolveConfig = conflictResolveConfig;
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/YangJavaList.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/YangJavaList.java
new file mode 100644
index 0000000..6f08b5d
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/YangJavaList.java
@@ -0,0 +1,132 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.yangutils.translator.tojava.javamodel;
+
+import java.io.IOException;
+
+import org.onosproject.yangutils.datamodel.YangList;
+import org.onosproject.yangutils.translator.exception.TranslatorException;
+import org.onosproject.yangutils.translator.tojava.JavaCodeGenerator;
+import org.onosproject.yangutils.translator.tojava.JavaFileInfo;
+import org.onosproject.yangutils.translator.tojava.TempJavaCodeFragmentFiles;
+import org.onosproject.yangutils.translator.tojava.utils.YangPluginConfig;
+
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.GENERATE_INTERFACE_WITH_BUILDER;
+import static org.onosproject.yangutils.translator.tojava.utils.YangJavaModelUtils.generateCodeAndUpdateInParent;
+
+/**
+ * Represents YANG list information extended to support java code generation.
+ */
+public class YangJavaList
+        extends YangList
+        implements JavaCodeGeneratorInfo, JavaCodeGenerator {
+
+    private static final long serialVersionUID = 806201626L;
+
+    /**
+     * Contains the information of the java file being generated.
+     */
+    private JavaFileInfo javaFileInfo;
+
+    /**
+     * File handle to maintain temporary java code fragments as per the code
+     * snippet types.
+     */
+    private transient TempJavaCodeFragmentFiles tempFileHandle;
+
+    /**
+     * Creates YANG java list object.
+     */
+    public YangJavaList() {
+        super();
+        setJavaFileInfo(new JavaFileInfo());
+        getJavaFileInfo().setGeneratedFileTypes(GENERATE_INTERFACE_WITH_BUILDER);
+    }
+
+    /**
+     * Returns the generated java file information.
+     *
+     * @return generated java file information
+     */
+    @Override
+    public JavaFileInfo getJavaFileInfo() {
+        if (javaFileInfo == null) {
+            throw new TranslatorException("Missing java info in java datamodel node");
+        }
+        return javaFileInfo;
+    }
+
+    /**
+     * Sets the java file info object.
+     *
+     * @param javaInfo java file info object
+     */
+    @Override
+    public void setJavaFileInfo(JavaFileInfo javaInfo) {
+        javaFileInfo = javaInfo;
+    }
+
+    /**
+     * Returns the temporary file handle.
+     *
+     * @return temporary file handle
+     */
+    @Override
+    public TempJavaCodeFragmentFiles getTempJavaCodeFragmentFiles() {
+        return tempFileHandle;
+    }
+
+    /**
+     * Sets temporary file handle.
+     *
+     * @param fileHandle temporary file handle
+     */
+    @Override
+    public void setTempJavaCodeFragmentFiles(TempJavaCodeFragmentFiles fileHandle) {
+        tempFileHandle = fileHandle;
+    }
+
+    /**
+     * Prepare the information for java code generation corresponding to YANG
+     * list info.
+     *
+     * @param yangPlugin YANG plugin config
+     * @throws TranslatorException translator operation fail
+     */
+    @Override
+    public void generateCodeEntry(YangPluginConfig yangPlugin) throws TranslatorException {
+        try {
+            generateCodeAndUpdateInParent(this, yangPlugin, true);
+        } catch (IOException e) {
+            throw new TranslatorException(
+                    "Failed to prepare generate code entry for list node " + getName());
+        }
+    }
+
+    /**
+     * Creates a java file using the YANG list info.
+     *
+     * @throws TranslatorException translator operation fail
+     */
+    @Override
+    public void generateCodeExit() throws TranslatorException {
+        try {
+            getTempJavaCodeFragmentFiles().generateJavaFile(GENERATE_INTERFACE_WITH_BUILDER, this);
+        } catch (IOException e) {
+            throw new TranslatorException("Failed to generate code for list node " + getName());
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/YangJavaModule.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/YangJavaModule.java
new file mode 100644
index 0000000..1413f9c
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/YangJavaModule.java
@@ -0,0 +1,212 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.yangutils.translator.tojava.javamodel;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangNotification;
+import org.onosproject.yangutils.translator.exception.TranslatorException;
+import org.onosproject.yangutils.translator.tojava.JavaCodeGenerator;
+import org.onosproject.yangutils.translator.tojava.JavaFileInfo;
+import org.onosproject.yangutils.translator.tojava.TempJavaCodeFragmentFiles;
+import org.onosproject.yangutils.translator.tojava.utils.YangPluginConfig;
+
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.GENERATE_EVENT_CLASS;
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.GENERATE_EVENT_LISTENER_INTERFACE;
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.GENERATE_EVENT_SUBJECT_CLASS;
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.GENERATE_SERVICE_AND_MANAGER;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaIdentifierSyntax.getRootPackage;
+import static org.onosproject.yangutils.translator.tojava.utils.YangJavaModelUtils.generateCodeOfRootNode;
+import static org.onosproject.yangutils.utils.io.impl.YangIoUtils.searchAndDeleteTempDir;
+
+/**
+ * Represents module information extended to support java code generation.
+ */
+public class YangJavaModule
+        extends YangModule
+        implements JavaCodeGeneratorInfo, JavaCodeGenerator {
+
+    private static final long serialVersionUID = 806201625L;
+
+    /**
+     * Contains the information of the java file being generated.
+     */
+    private JavaFileInfo javaFileInfo;
+
+    /**
+     * File handle to maintain temporary java code fragments as per the code
+     * snippet types.
+     */
+    private transient TempJavaCodeFragmentFiles tempFileHandle;
+
+    /**
+     * List of notifications nodes.
+     */
+    private List<YangNode> notificationNodes;
+
+    /**
+     * Creates a YANG node of module type.
+     */
+    public YangJavaModule() {
+        super();
+        setJavaFileInfo(new JavaFileInfo());
+        setNotificationNodes(new ArrayList<>());
+        int gentype = GENERATE_SERVICE_AND_MANAGER;
+        if (isNotificationChildNodePresent(this)) {
+            gentype = GENERATE_SERVICE_AND_MANAGER | GENERATE_EVENT_SUBJECT_CLASS | GENERATE_EVENT_CLASS
+                    | GENERATE_EVENT_LISTENER_INTERFACE;
+        }
+        getJavaFileInfo().setGeneratedFileTypes(gentype);
+
+    }
+
+    /**
+     * Returns the generated java file information.
+     *
+     * @return generated java file information
+     */
+    @Override
+    public JavaFileInfo getJavaFileInfo() {
+        if (javaFileInfo == null) {
+            throw new TranslatorException("Missing java info in java datamodel node");
+        }
+        return javaFileInfo;
+    }
+
+    /**
+     * Sets the java file info object.
+     *
+     * @param javaInfo java file info object
+     */
+    @Override
+    public void setJavaFileInfo(JavaFileInfo javaInfo) {
+        javaFileInfo = javaInfo;
+    }
+
+    /**
+     * Returns the temporary file handle.
+     *
+     * @return temporary file handle
+     */
+    @Override
+    public TempJavaCodeFragmentFiles getTempJavaCodeFragmentFiles() {
+        return tempFileHandle;
+    }
+
+    /**
+     * Sets temporary file handle.
+     *
+     * @param fileHandle temporary file handle
+     */
+    @Override
+    public void setTempJavaCodeFragmentFiles(TempJavaCodeFragmentFiles fileHandle) {
+        tempFileHandle = fileHandle;
+    }
+
+    /**
+     * Generates java code for module.
+     *
+     * @param yangPlugin YANG plugin config
+     * @throws TranslatorException when fails to generate the source files
+     */
+    @Override
+    public void generateCodeEntry(YangPluginConfig yangPlugin) throws TranslatorException {
+        String modulePkg = getRootPackage(getVersion(), getNameSpace().getUri(), getRevision().getRevDate(),
+                yangPlugin.getConflictResolver());
+        try {
+            generateCodeOfRootNode(this, yangPlugin, modulePkg);
+        } catch (IOException e) {
+            throw new TranslatorException(
+                    "Failed to prepare generate code entry for module node " + getName());
+        }
+    }
+
+    /**
+     * Creates a java file using the YANG module info.
+     */
+    @Override
+    public void generateCodeExit() throws TranslatorException {
+        /**
+         * As part of the notification support the following files needs to be generated.
+         * 1) Subject of the notification(event), this is simple interface with builder class.
+         * 2) Event class extending "AbstractEvent" and defining event type enum.
+         * 3) Event listener interface extending "EventListener".
+         * 4) Event subject class.
+         *
+         * The manager class needs to extend the "ListenerRegistry".
+         */
+        try {
+            getTempJavaCodeFragmentFiles().generateJavaFile(GENERATE_SERVICE_AND_MANAGER, this);
+            searchAndDeleteTempDir(getJavaFileInfo().getBaseCodeGenPath() +
+                    getJavaFileInfo().getPackageFilePath());
+        } catch (IOException e) {
+            throw new TranslatorException("Failed to generate code for module node " + getName());
+        }
+    }
+
+    /**
+     * Returns notifications node list.
+     *
+     * @return notification nodes
+     */
+    public List<YangNode> getNotificationNodes() {
+        return notificationNodes;
+    }
+
+    /**
+     * Sets notifications list.
+     *
+     * @param notificationNodes notification list
+     */
+    private void setNotificationNodes(List<YangNode> notificationNodes) {
+        this.notificationNodes = notificationNodes;
+    }
+
+    /**
+     * Adds to notification node list.
+     *
+     * @param curNode notification node
+     */
+    private void addToNotificaitonList(YangNode curNode) {
+        getNotificationNodes().add(curNode);
+    }
+
+    /**
+     * Checks if there is any rpc defined in the module or sub-module.
+     *
+     * @param rootNode root node of the data model
+     * @return status of rpc's existence
+     */
+    public boolean isNotificationChildNodePresent(YangNode rootNode) {
+        YangNode childNode = rootNode.getChild();
+
+        while (childNode != null) {
+            if (childNode instanceof YangNotification) {
+                addToNotificaitonList(childNode);
+            }
+            childNode = childNode.getNextSibling();
+        }
+
+        if (!getNotificationNodes().isEmpty()) {
+            return true;
+        }
+        return false;
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/YangJavaNotification.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/YangJavaNotification.java
new file mode 100644
index 0000000..68f8164
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/YangJavaNotification.java
@@ -0,0 +1,176 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.translator.tojava.javamodel;
+
+import java.io.IOException;
+
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangNotification;
+import org.onosproject.yangutils.translator.exception.TranslatorException;
+import org.onosproject.yangutils.translator.tojava.JavaCodeGenerator;
+import org.onosproject.yangutils.translator.tojava.JavaFileInfo;
+import org.onosproject.yangutils.translator.tojava.JavaFileInfoContainer;
+import org.onosproject.yangutils.translator.tojava.JavaQualifiedTypeInfo;
+import org.onosproject.yangutils.translator.tojava.TempJavaCodeFragmentFiles;
+import org.onosproject.yangutils.translator.tojava.TempJavaCodeFragmentFilesContainer;
+import org.onosproject.yangutils.translator.tojava.utils.JavaExtendsListHolder;
+import org.onosproject.yangutils.translator.tojava.utils.YangPluginConfig;
+
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.GENERATE_INTERFACE_WITH_BUILDER;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaIdentifierSyntax.getCapitalCase;
+import static org.onosproject.yangutils.translator.tojava.utils.YangJavaModelUtils.generateCodeOfAugmentableNode;
+import static org.onosproject.yangutils.utils.UtilConstants.EVENT_LISTENER_STRING;
+import static org.onosproject.yangutils.utils.UtilConstants.EVENT_STRING;
+
+/**
+ * Represents notification information extended to support java code generation.
+ */
+public class YangJavaNotification
+        extends YangNotification
+        implements JavaCodeGenerator, JavaCodeGeneratorInfo {
+
+    private static final long serialVersionUID = 806201624L;
+
+    /**
+     * Contains information of the java file being generated.
+     */
+    private JavaFileInfo javaFileInfo;
+
+    /**
+     * File handle to maintain temporary java code fragments as per the code
+     * snippet types.
+     */
+    private transient TempJavaCodeFragmentFiles tempFileHandle;
+
+    /**
+     * Creates an instance of java Notification.
+     */
+    public YangJavaNotification() {
+        super();
+        setJavaFileInfo(new JavaFileInfo());
+        getJavaFileInfo().setGeneratedFileTypes(GENERATE_INTERFACE_WITH_BUILDER);
+    }
+
+    /**
+     * Returns the generated java file information.
+     *
+     * @return generated java file information
+     */
+    @Override
+    public JavaFileInfo getJavaFileInfo() {
+
+        if (javaFileInfo == null) {
+            throw new TranslatorException("Missing java info in java datamodel node");
+        }
+        return javaFileInfo;
+    }
+
+    /**
+     * Sets the java file info object.
+     *
+     * @param javaInfo java file info object
+     */
+    @Override
+    public void setJavaFileInfo(JavaFileInfo javaInfo) {
+        javaFileInfo = javaInfo;
+    }
+
+    /**
+     * Returns the temporary file handle.
+     *
+     * @return temporary file handle
+     */
+    @Override
+    public TempJavaCodeFragmentFiles getTempJavaCodeFragmentFiles() {
+        return tempFileHandle;
+    }
+
+    /**
+     * Sets temporary file handle.
+     *
+     * @param fileHandle temporary file handle
+     */
+    @Override
+    public void setTempJavaCodeFragmentFiles(TempJavaCodeFragmentFiles fileHandle) {
+        tempFileHandle = fileHandle;
+    }
+
+    /**
+     * Prepare the information for java code generation corresponding to YANG
+     * notification info.
+     *
+     * @param yangPlugin YANG plugin config
+     * @throws TranslatorException translator operation fail
+     */
+    @Override
+    public void generateCodeEntry(YangPluginConfig yangPlugin) throws TranslatorException {
+
+        /**
+         * As part of the notification support the following files needs to be generated.
+         * 1) Subject of the notification(event), this is simple interface with builder class.
+         * 2) Event class extending "AbstractEvent" and defining event type enum.
+         * 3) Event listener interface extending "EventListener".
+         *
+         * The manager class needs to extend the ListenerRegistry.
+         */
+
+        // Generate subject of the notification(event), this is simple interface
+        // with builder class.
+        try {
+            generateCodeOfAugmentableNode(this, yangPlugin);
+            addNotificationToExtendsList();
+        } catch (IOException e) {
+            throw new TranslatorException(
+                    "Failed to prepare generate code entry for notification node " + getName());
+        }
+    }
+
+    /*Adds current notification info to the extends list so its parents service*/
+    private void addNotificationToExtendsList() {
+        YangNode parent = getParent();
+        JavaExtendsListHolder holder = ((TempJavaCodeFragmentFilesContainer) parent)
+                .getTempJavaCodeFragmentFiles()
+                .getServiceTempFiles().getJavaExtendsListHolder();
+        JavaQualifiedTypeInfo event = new JavaQualifiedTypeInfo();
+
+        String parentInfo = getCapitalCase(((JavaFileInfoContainer) parent)
+                .getJavaFileInfo().getJavaName());
+        event.setClassInfo(parentInfo + EVENT_STRING);
+        event.setPkgInfo(getJavaFileInfo().getPackage());
+        holder.addToExtendsList(event, parent);
+
+        JavaQualifiedTypeInfo eventListener = new JavaQualifiedTypeInfo();
+
+        eventListener.setClassInfo(parentInfo + EVENT_LISTENER_STRING);
+        eventListener.setPkgInfo(getJavaFileInfo().getPackage());
+        holder.addToExtendsList(eventListener, parent);
+
+    }
+
+    /**
+     * Creates a java file using the YANG notification info.
+     */
+    @Override
+    public void generateCodeExit() throws TranslatorException {
+        try {
+            getTempJavaCodeFragmentFiles().generateJavaFile(GENERATE_INTERFACE_WITH_BUILDER, this);
+        } catch (IOException e) {
+            throw new TranslatorException("Failed to generate code for notification node " + getName());
+        }
+
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/YangJavaOutput.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/YangJavaOutput.java
new file mode 100644
index 0000000..dda3fc9
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/YangJavaOutput.java
@@ -0,0 +1,136 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.translator.tojava.javamodel;
+
+import java.io.IOException;
+
+import org.onosproject.yangutils.datamodel.YangOutput;
+import org.onosproject.yangutils.translator.exception.TranslatorException;
+import org.onosproject.yangutils.translator.tojava.JavaCodeGenerator;
+import org.onosproject.yangutils.translator.tojava.JavaFileInfo;
+import org.onosproject.yangutils.translator.tojava.TempJavaCodeFragmentFiles;
+import org.onosproject.yangutils.translator.tojava.utils.YangPluginConfig;
+
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.GENERATE_INTERFACE_WITH_BUILDER;
+import static org.onosproject.yangutils.translator.tojava.utils.YangJavaModelUtils.generateCodeOfAugmentableNode;
+
+/**
+ * Represents output information extended to support java code generation.
+ */
+public class YangJavaOutput
+        extends YangOutput
+        implements JavaCodeGeneratorInfo, JavaCodeGenerator {
+
+    private static final long serialVersionUID = 806201623L;
+
+    /**
+     * Contains information of the java file being generated.
+     */
+    private JavaFileInfo javaFileInfo;
+
+    /**
+     * File handle to maintain temporary java code fragments as per the code
+     * snippet types.
+     */
+    private transient TempJavaCodeFragmentFiles tempFileHandle;
+
+    /**
+     * Creates an instance of java output.
+     */
+    public YangJavaOutput() {
+        super();
+        setJavaFileInfo(new JavaFileInfo());
+        getJavaFileInfo().setGeneratedFileTypes(GENERATE_INTERFACE_WITH_BUILDER);
+    }
+
+    /**
+     * Returns the generated java file information.
+     *
+     * @return generated java file information
+     */
+    @Override
+    public JavaFileInfo getJavaFileInfo() {
+        if (javaFileInfo == null) {
+            throw new TranslatorException("missing java info in java datamodel node");
+        }
+        return javaFileInfo;
+    }
+
+    /**
+     * Sets the java file info object.
+     *
+     * @param javaInfo java file info object
+     */
+    @Override
+    public void setJavaFileInfo(JavaFileInfo javaInfo) {
+        javaFileInfo = javaInfo;
+    }
+
+    /**
+     * Returns the temporary file handle.
+     *
+     * @return temporary file handle
+     */
+    @Override
+    public TempJavaCodeFragmentFiles getTempJavaCodeFragmentFiles() {
+        return tempFileHandle;
+    }
+
+    /**
+     * Sets temporary file handle.
+     *
+     * @param fileHandle temporary file handle
+     */
+    @Override
+    public void setTempJavaCodeFragmentFiles(TempJavaCodeFragmentFiles fileHandle) {
+        tempFileHandle = fileHandle;
+    }
+
+    /**
+     * Prepare the information for java code generation corresponding to YANG
+     * output info.
+     *
+     * @param yangPlugin YANG plugin config
+     * @throws TranslatorException translator operation fail
+     */
+    @Override
+    public void generateCodeEntry(YangPluginConfig yangPlugin) throws TranslatorException {
+        try {
+            generateCodeOfAugmentableNode(this, yangPlugin);
+        } catch (IOException e) {
+            throw new TranslatorException(
+                    "Failed to prepare generate code entry for output node " + getName());
+        }
+
+    }
+
+    /**
+     * Creates a java file using the YANG output info.
+     *
+     * @throws TranslatorException translator operation fail
+     */
+    @Override
+    public void generateCodeExit() throws TranslatorException {
+        try {
+            getTempJavaCodeFragmentFiles().generateJavaFile(GENERATE_INTERFACE_WITH_BUILDER, this);
+        } catch (IOException e) {
+            throw new TranslatorException(
+                    "Failed to prepare generate code exit for output node " + getName());
+        }
+    }
+
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/YangJavaRpc.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/YangJavaRpc.java
new file mode 100644
index 0000000..f3730a2
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/YangJavaRpc.java
@@ -0,0 +1,254 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.translator.tojava.javamodel;
+
+import java.io.IOException;
+
+import org.onosproject.yangutils.datamodel.RpcNotificationContainer;
+import org.onosproject.yangutils.datamodel.YangInput;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangOutput;
+import org.onosproject.yangutils.datamodel.YangRpc;
+import org.onosproject.yangutils.translator.exception.TranslatorException;
+import org.onosproject.yangutils.translator.tojava.JavaAttributeInfo;
+import org.onosproject.yangutils.translator.tojava.JavaCodeGenerator;
+import org.onosproject.yangutils.translator.tojava.JavaFileInfo;
+import org.onosproject.yangutils.translator.tojava.JavaFileInfoContainer;
+import org.onosproject.yangutils.translator.tojava.JavaQualifiedTypeInfo;
+import org.onosproject.yangutils.translator.tojava.TempJavaCodeFragmentFiles;
+import org.onosproject.yangutils.translator.tojava.TempJavaCodeFragmentFilesContainer;
+import org.onosproject.yangutils.translator.tojava.TempJavaFragmentFiles;
+import org.onosproject.yangutils.translator.tojava.utils.YangPluginConfig;
+
+import static org.onosproject.yangutils.datamodel.utils.DataModelUtils.getParentNodeInGenCode;
+import static org.onosproject.yangutils.translator.tojava.JavaAttributeInfo.getAttributeInfoForTheData;
+import static org.onosproject.yangutils.translator.tojava.JavaQualifiedTypeInfo.getQualifiedTypeInfoOfCurNode;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaIdentifierSyntax.getCapitalCase;
+import static org.onosproject.yangutils.translator.tojava.utils.YangJavaModelUtils.updatePackageInfo;
+import static org.onosproject.yangutils.utils.UtilConstants.ACTIVATE;
+import static org.onosproject.yangutils.utils.UtilConstants.COMPONENT;
+import static org.onosproject.yangutils.utils.UtilConstants.DEACTIVATE;
+import static org.onosproject.yangutils.utils.UtilConstants.MANAGER;
+import static org.onosproject.yangutils.utils.UtilConstants.REFERENCE;
+import static org.onosproject.yangutils.utils.UtilConstants.REFERENCE_CARDINALITY;
+import static org.onosproject.yangutils.utils.UtilConstants.SERVICE;
+
+/**
+ * Represents rpc information extended to support java code generation.
+ */
+public class YangJavaRpc
+        extends YangRpc
+        implements JavaCodeGenerator, JavaCodeGeneratorInfo {
+
+    private static final long serialVersionUID = 806201622L;
+
+    /**
+     * Contains the information of the java file being generated.
+     */
+    private JavaFileInfo javaFileInfo;
+
+    /**
+     * Temproary file for code generation.
+     */
+    private transient TempJavaCodeFragmentFiles tempJavaCodeFragmentFiles;
+
+    /**
+     * Creates an instance of YANG java rpc.
+     */
+    public YangJavaRpc() {
+        super();
+        setJavaFileInfo(new JavaFileInfo());
+    }
+
+    /**
+     * Returns the generated java file information.
+     *
+     * @return generated java file information
+     */
+    @Override
+    public JavaFileInfo getJavaFileInfo() {
+
+        if (javaFileInfo == null) {
+            throw new TranslatorException("missing java info in java datamodel node");
+        }
+        return javaFileInfo;
+    }
+
+    /**
+     * Sets the java file info object.
+     *
+     * @param javaInfo java file info object
+     */
+    @Override
+    public void setJavaFileInfo(JavaFileInfo javaInfo) {
+        javaFileInfo = javaInfo;
+    }
+
+    @Override
+    public TempJavaCodeFragmentFiles getTempJavaCodeFragmentFiles() {
+        return tempJavaCodeFragmentFiles;
+    }
+
+    @Override
+    public void setTempJavaCodeFragmentFiles(TempJavaCodeFragmentFiles fileHandle) {
+        tempJavaCodeFragmentFiles = fileHandle;
+    }
+
+    /**
+     * Prepares the information for java code generation corresponding to YANG
+     * RPC info.
+     *
+     * @param yangPlugin YANG plugin config
+     * @throws TranslatorException translator operations fails
+     */
+    @Override
+    public void generateCodeEntry(YangPluginConfig yangPlugin)
+            throws TranslatorException {
+
+        // Add package information for rpc and create corresponding folder.
+        try {
+            updatePackageInfo(this, yangPlugin);
+        } catch (IOException e) {
+            throw new TranslatorException("Failed to prepare generate code entry for RPC node " + getName());
+        }
+    }
+
+    /**
+     * Creates a java file using the YANG RPC info.
+     *
+     * @throws TranslatorException translator operations fails
+     */
+    @Override
+    public void generateCodeExit()
+            throws TranslatorException {
+        // Get the parent module/sub-module.
+        YangNode parent = getParentNodeInGenCode(this);
+
+        // Parent should be holder of rpc or notification.
+        if (!(parent instanceof RpcNotificationContainer)) {
+            throw new TranslatorException("parent node of rpc can only be module or sub-module");
+        }
+
+        /*
+         * Create attribute info for input and output of rpc and add it to the
+         * parent import list.
+         */
+
+        JavaAttributeInfo javaAttributeInfoOfInput = null;
+        JavaAttributeInfo javaAttributeInfoOfOutput = null;
+
+        // Get the child input and output node and obtain create java attribute
+        // info.
+        YangNode yangNode = getChild();
+        while (yangNode != null) {
+            if (yangNode instanceof YangInput) {
+                javaAttributeInfoOfInput = getChildNodeAsAttributeInParentService(yangNode, this);
+
+            } else if (yangNode instanceof YangOutput) {
+                javaAttributeInfoOfOutput = getChildNodeAsAttributeInParentService(yangNode, this);
+            } else {
+                throw new TranslatorException("RPC should contain only input/output child nodes.");
+            }
+            yangNode = yangNode.getNextSibling();
+        }
+
+        if (!(parent instanceof TempJavaCodeFragmentFilesContainer)) {
+            throw new TranslatorException("missing parent temp file handle");
+        }
+
+        /*
+         * Add the rpc information to the parent's service temp file.
+         */
+        try {
+
+            ((TempJavaCodeFragmentFilesContainer) parent).getTempJavaCodeFragmentFiles().getServiceTempFiles()
+                    .addJavaSnippetInfoToApplicableTempFiles(javaAttributeInfoOfInput, javaAttributeInfoOfOutput,
+                            ((JavaFileInfoContainer) parent).getJavaFileInfo().getPluginConfig(), getName());
+
+        } catch (IOException e) {
+            throw new TranslatorException("Failed to generate code for RPC node " + getName());
+        }
+        // No file will be generated during RPC exit.
+    }
+
+    /**
+     * Creates an attribute info object corresponding to a data model node and
+     * return it.
+     *
+     * @param childNode   child data model node(input / output) for which the java code generation
+     *                    is being handled
+     * @param currentNode parent node (module / sub-module) in which the child node is an attribute
+     * @return AttributeInfo attribute details required to add in temporary
+     * files
+     */
+    public JavaAttributeInfo getChildNodeAsAttributeInParentService(
+            YangNode childNode, YangNode currentNode) {
+
+        YangNode parentNode = getParentNodeInGenCode(currentNode);
+
+        String childNodeName = ((JavaFileInfoContainer) childNode).getJavaFileInfo().getJavaName();
+        /*
+         * Get the import info corresponding to the attribute for import in
+         * generated java files or qualified access
+         */
+        JavaQualifiedTypeInfo qualifiedTypeInfo = getQualifiedTypeInfoOfCurNode(childNode,
+                getCapitalCase(childNodeName));
+        if (!(parentNode instanceof TempJavaCodeFragmentFilesContainer)) {
+            throw new TranslatorException("Parent node does not have file info");
+        }
+
+        TempJavaFragmentFiles tempJavaFragmentFiles;
+        tempJavaFragmentFiles = ((TempJavaCodeFragmentFilesContainer) parentNode)
+                .getTempJavaCodeFragmentFiles()
+                .getServiceTempFiles();
+
+        if (tempJavaFragmentFiles == null) {
+            throw new TranslatorException("Parent node does not have service file info");
+        }
+        boolean isQualified = addImportToService(qualifiedTypeInfo);
+        return getAttributeInfoForTheData(qualifiedTypeInfo, childNodeName, null, isQualified, false);
+    }
+
+    /**
+     * Adds to service class import list.
+     *
+     * @param importInfo import info
+     * @return true or false
+     */
+    private boolean addImportToService(JavaQualifiedTypeInfo importInfo) {
+        JavaFileInfo fileInfo = ((JavaFileInfoContainer) getParent()).getJavaFileInfo();
+
+        if (importInfo.getClassInfo().contentEquals(SERVICE)
+                || importInfo.getClassInfo().contentEquals(COMPONENT)
+                || importInfo.getClassInfo().contentEquals(getCapitalCase(ACTIVATE))
+                || importInfo.getClassInfo().contentEquals(getCapitalCase(DEACTIVATE))
+                || importInfo.getClassInfo().contentEquals(REFERENCE_CARDINALITY)
+                || importInfo.getClassInfo().contentEquals(REFERENCE)
+                || importInfo.getClassInfo().contentEquals(getCapitalCase(fileInfo.getJavaName() + SERVICE))
+                || importInfo.getClassInfo().contentEquals(getCapitalCase(fileInfo.getJavaName() + MANAGER))) {
+            return true;
+        }
+
+        String className;
+        className = getCapitalCase(fileInfo.getJavaName()) + "Service";
+
+        return ((TempJavaCodeFragmentFilesContainer) getParent()).getTempJavaCodeFragmentFiles()
+                .getServiceTempFiles().getJavaImportData().addImportInfo(importInfo,
+                        className, fileInfo.getPackage());
+    }
+
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/YangJavaSubModule.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/YangJavaSubModule.java
new file mode 100644
index 0000000..d838682
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/YangJavaSubModule.java
@@ -0,0 +1,216 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.yangutils.translator.tojava.javamodel;
+
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
+import org.onosproject.yangutils.datamodel.YangBelongsTo;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangNotification;
+import org.onosproject.yangutils.datamodel.YangSubModule;
+import org.onosproject.yangutils.translator.exception.TranslatorException;
+import org.onosproject.yangutils.translator.tojava.JavaCodeGenerator;
+import org.onosproject.yangutils.translator.tojava.JavaFileInfo;
+import org.onosproject.yangutils.translator.tojava.TempJavaCodeFragmentFiles;
+import org.onosproject.yangutils.translator.tojava.utils.YangPluginConfig;
+
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.GENERATE_EVENT_CLASS;
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.GENERATE_EVENT_LISTENER_INTERFACE;
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.GENERATE_EVENT_SUBJECT_CLASS;
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.GENERATE_SERVICE_AND_MANAGER;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaIdentifierSyntax.getRootPackage;
+import static org.onosproject.yangutils.translator.tojava.utils.YangJavaModelUtils.generateCodeOfRootNode;
+import static org.onosproject.yangutils.utils.io.impl.YangIoUtils.searchAndDeleteTempDir;
+
+/**
+ * Represents sub module information extended to support java code generation.
+ */
+public class YangJavaSubModule
+        extends YangSubModule
+        implements JavaCodeGeneratorInfo, JavaCodeGenerator {
+
+    private static final long serialVersionUID = 806201621L;
+
+    /**
+     * Contains the information of the java file being generated.
+     */
+    private JavaFileInfo javaFileInfo;
+
+    /**
+     * File handle to maintain temporary java code fragments as per the code
+     * snippet types.
+     */
+    private transient TempJavaCodeFragmentFiles tempFileHandle;
+
+    /**
+     * List of notifications nodes.
+     */
+    private List<YangNode> notificationNodes = new ArrayList<>();
+
+    /**
+     * Creates YANG java sub module object.
+     */
+    public YangJavaSubModule() {
+        super();
+        setJavaFileInfo(new JavaFileInfo());
+        int gentype = GENERATE_SERVICE_AND_MANAGER;
+        if (isNotificationChildNodePresent(this)) {
+            gentype = GENERATE_SERVICE_AND_MANAGER | GENERATE_EVENT_SUBJECT_CLASS | GENERATE_EVENT_CLASS
+                    | GENERATE_EVENT_LISTENER_INTERFACE;
+        }
+        getJavaFileInfo().setGeneratedFileTypes(gentype);
+    }
+
+    /**
+     * Returns the generated java file information.
+     *
+     * @return generated java file information
+     */
+    @Override
+    public JavaFileInfo getJavaFileInfo() {
+        if (javaFileInfo == null) {
+            throw new TranslatorException("Missing java info in java datamodel node");
+        }
+        return javaFileInfo;
+    }
+
+    /**
+     * Sets the java file info object.
+     *
+     * @param javaInfo java file info object
+     */
+    @Override
+    public void setJavaFileInfo(JavaFileInfo javaInfo) {
+        javaFileInfo = javaInfo;
+    }
+
+    /**
+     * Returns the temporary file handle.
+     *
+     * @return temporary file handle
+     */
+    @Override
+    public TempJavaCodeFragmentFiles getTempJavaCodeFragmentFiles() {
+        return tempFileHandle;
+    }
+
+    /**
+     * Sets temporary file handle.
+     *
+     * @param fileHandle temporary file handle
+     */
+    @Override
+    public void setTempJavaCodeFragmentFiles(TempJavaCodeFragmentFiles fileHandle) {
+        tempFileHandle = fileHandle;
+    }
+
+    /**
+     * Returns the name space of the module to which the sub module belongs to.
+     *
+     * @param belongsToInfo Information of the module to which the sub module
+     *                      belongs
+     * @return the name space string of the module.
+     */
+    public String getNameSpaceFromModule(YangBelongsTo belongsToInfo) {
+        return ((YangModule) belongsToInfo.getModuleNode()).getNameSpace().getUri();
+    }
+
+    /**
+     * Prepares the information for java code generation corresponding to YANG
+     * submodule info.
+     *
+     * @param yangPlugin YANG plugin config
+     * @throws TranslatorException when fails to translate
+     */
+    @Override
+    public void generateCodeEntry(YangPluginConfig yangPlugin) throws TranslatorException {
+        String subModulePkg = getRootPackage(getVersion(), getNameSpaceFromModule(getBelongsTo()),
+                getRevision().getRevDate(), yangPlugin.getConflictResolver());
+        try {
+            generateCodeOfRootNode(this, yangPlugin, subModulePkg);
+        } catch (IOException e) {
+            throw new TranslatorException(
+                    "failed to prepare generate code entry for submodule node " + getName());
+        }
+
+    }
+
+    /**
+     * Creates a java file using the YANG submodule info.
+     */
+    @Override
+    public void generateCodeExit() throws TranslatorException {
+        /**
+         * As part of the notification support the following files needs to be generated.
+         * 1) Subject of the notification(event), this is simple interface with builder class.
+         * 2) Event class extending "AbstractEvent" and defining event type enum.
+         * 3) Event listener interface extending "EventListener".
+         * 4) Event subject class.
+         *
+         * The manager class needs to extend the "ListenerRegistry".
+         */
+        try {
+            getTempJavaCodeFragmentFiles().generateJavaFile(GENERATE_SERVICE_AND_MANAGER, this);
+            searchAndDeleteTempDir(getJavaFileInfo().getBaseCodeGenPath() +
+                    getJavaFileInfo().getPackageFilePath());
+        } catch (IOException e) {
+            throw new TranslatorException("Failed to generate code for submodule node " + getName());
+        }
+    }
+
+    /**
+     * Returns notifications node list.
+     *
+     * @return notification nodes
+     */
+    public List<YangNode> getNotificationNodes() {
+        return notificationNodes;
+    }
+
+    /**
+     * Adds to notification node list.
+     *
+     * @param curNode notification node
+     */
+    private void addToNotificaitonList(YangNode curNode) {
+        getNotificationNodes().add(curNode);
+    }
+
+    /**
+     * Checks if there is any rpc defined in the module or sub-module.
+     *
+     * @param rootNode root node of the data model
+     * @return status of rpc's existence
+     */
+    public boolean isNotificationChildNodePresent(YangNode rootNode) {
+        YangNode childNode = rootNode.getChild();
+
+        while (childNode != null) {
+            if (childNode instanceof YangNotification) {
+                addToNotificaitonList(childNode);
+            }
+            childNode = childNode.getNextSibling();
+        }
+
+        if (!getNotificationNodes().isEmpty()) {
+            return true;
+        }
+        return false;
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/YangJavaType.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/YangJavaType.java
new file mode 100644
index 0000000..e537743
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/YangJavaType.java
@@ -0,0 +1,86 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.yangutils.translator.tojava.javamodel;
+
+import org.onosproject.yangutils.datamodel.YangType;
+import org.onosproject.yangutils.translator.exception.TranslatorException;
+import org.onosproject.yangutils.translator.tojava.JavaQualifiedTypeInfo;
+import org.onosproject.yangutils.translator.tojava.utils.AttributesJavaDataType;
+import org.onosproject.yangutils.translator.tojava.utils.YangToJavaNamingConflictUtil;
+
+/**
+ * Represents java information corresponding to the YANG type.
+ *
+ * @param <T> generic parameter for YANG java type
+ */
+public class YangJavaType<T>
+        extends YangType<T>
+        implements JavaQualifiedTypeResolver {
+
+    private JavaQualifiedTypeInfo javaQualifiedAccess;
+
+    /**
+     * Create a YANG leaf object with java qualified access details.
+     */
+    public YangJavaType() {
+        super();
+        setJavaQualifiedInfo(new JavaQualifiedTypeInfo());
+    }
+
+    @Override
+    public void updateJavaQualifiedInfo(YangToJavaNamingConflictUtil conflictResolver) {
+        JavaQualifiedTypeInfo importInfo = getJavaQualifiedInfo();
+
+        /*
+         * Type is added as an attribute in the class.
+         */
+        String className = AttributesJavaDataType.getJavaImportClass(this, false, conflictResolver);
+        if (className != null) {
+            /*
+             * Corresponding to the attribute type a class needs to be imported,
+             * since it can be a derived type or a usage of wrapper classes.
+             */
+            importInfo.setClassInfo(className);
+            String classPkg = AttributesJavaDataType.getJavaImportPackage(this,
+                    false,  conflictResolver);
+            if (classPkg == null) {
+                throw new TranslatorException("import package cannot be null when the class is used");
+            }
+            importInfo.setPkgInfo(classPkg);
+        } else {
+            /*
+             * The attribute does not need a class to be imported, for example
+             * built in java types.
+             */
+            String dataTypeName = AttributesJavaDataType.getJavaDataType(this);
+            if (dataTypeName == null) {
+                throw new TranslatorException("not supported data type");
+            }
+            importInfo.setClassInfo(dataTypeName);
+        }
+        setJavaQualifiedInfo(importInfo);
+    }
+
+    @Override
+    public JavaQualifiedTypeInfo getJavaQualifiedInfo() {
+        return javaQualifiedAccess;
+    }
+
+    @Override
+    public void setJavaQualifiedInfo(JavaQualifiedTypeInfo typeInfo) {
+        javaQualifiedAccess = typeInfo;
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/YangJavaTypeDef.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/YangJavaTypeDef.java
new file mode 100644
index 0000000..0124510
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/YangJavaTypeDef.java
@@ -0,0 +1,135 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.yangutils.translator.tojava.javamodel;
+
+import java.io.IOException;
+
+import org.onosproject.yangutils.datamodel.YangTypeDef;
+import org.onosproject.yangutils.translator.exception.TranslatorException;
+import org.onosproject.yangutils.translator.tojava.JavaCodeGenerator;
+import org.onosproject.yangutils.translator.tojava.JavaFileInfo;
+import org.onosproject.yangutils.translator.tojava.TempJavaCodeFragmentFiles;
+import org.onosproject.yangutils.translator.tojava.utils.YangPluginConfig;
+
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.GENERATE_TYPEDEF_CLASS;
+import static org.onosproject.yangutils.translator.tojava.utils.YangJavaModelUtils.generateCodeOfNode;
+
+/**
+ * Represents type define information extended to support java code generation.
+ */
+public class YangJavaTypeDef
+        extends YangTypeDef
+        implements JavaCodeGeneratorInfo, JavaCodeGenerator {
+
+    private static final long serialVersionUID = 806201620L;
+
+    /**
+     * Contains the information of the java file being generated.
+     */
+    private JavaFileInfo javaFileInfo;
+
+    /**
+     * File handle to maintain temporary java code fragments as per the code
+     * snippet types.
+     */
+    private transient TempJavaCodeFragmentFiles tempFileHandle;
+
+    /**
+     * Creates a YANG java typedef object.
+     */
+    public YangJavaTypeDef() {
+        super();
+        setJavaFileInfo(new JavaFileInfo());
+        getJavaFileInfo().setGeneratedFileTypes(GENERATE_TYPEDEF_CLASS);
+    }
+
+    /**
+     * Returns the generated java file information.
+     *
+     * @return generated java file information
+     */
+    @Override
+    public JavaFileInfo getJavaFileInfo() {
+
+        if (javaFileInfo == null) {
+            throw new TranslatorException("Missing java info in java datamodel node");
+        }
+        return javaFileInfo;
+    }
+
+    /**
+     * Sets the java file info object.
+     *
+     * @param javaInfo java file info object
+     */
+    @Override
+    public void setJavaFileInfo(JavaFileInfo javaInfo) {
+        javaFileInfo = javaInfo;
+    }
+
+    /**
+     * Returns the temporary file handle.
+     *
+     * @return temporary file handle
+     */
+    @Override
+    public TempJavaCodeFragmentFiles getTempJavaCodeFragmentFiles() {
+        return tempFileHandle;
+    }
+
+    /**
+     * Sets temporary file handle.
+     *
+     * @param fileHandle temporary file handle
+     */
+    @Override
+    public void setTempJavaCodeFragmentFiles(TempJavaCodeFragmentFiles fileHandle) {
+        tempFileHandle = fileHandle;
+    }
+
+    /**
+     * Prepare the information for java code generation corresponding to YANG
+     * typedef info.
+     *
+     * @param yangPlugin YANG plugin config
+     * @throws TranslatorException when fails to translate
+     */
+    @Override
+    public void generateCodeEntry(YangPluginConfig yangPlugin) throws TranslatorException {
+        try {
+            generateCodeOfNode(this, yangPlugin);
+        } catch (IOException e) {
+            throw new TranslatorException(
+                    "Failed to prepare generate code entry for typedef node " + getName());
+        }
+
+    }
+
+    /**
+     * Create a java file using the YANG typedef info.
+     *
+     * @throws TranslatorException when fails to translate
+     */
+    @Override
+    public void generateCodeExit() throws TranslatorException {
+        try {
+            getTempJavaCodeFragmentFiles().generateJavaFile(GENERATE_TYPEDEF_CLASS, this);
+        } catch (IOException e) {
+            throw new TranslatorException("Failed to generate code for typedef node " + getName());
+        }
+    }
+
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/YangJavaUnion.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/YangJavaUnion.java
new file mode 100644
index 0000000..eac8e52
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/YangJavaUnion.java
@@ -0,0 +1,133 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.yangutils.translator.tojava.javamodel;
+
+import java.io.IOException;
+
+import org.onosproject.yangutils.datamodel.YangUnion;
+import org.onosproject.yangutils.translator.exception.TranslatorException;
+import org.onosproject.yangutils.translator.tojava.JavaCodeGenerator;
+import org.onosproject.yangutils.translator.tojava.JavaFileInfo;
+import org.onosproject.yangutils.translator.tojava.TempJavaCodeFragmentFiles;
+import org.onosproject.yangutils.translator.tojava.utils.YangPluginConfig;
+
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.GENERATE_UNION_CLASS;
+import static org.onosproject.yangutils.translator.tojava.utils.YangJavaModelUtils.generateCodeOfNode;
+
+/**
+ * Represents union information extended to support java code generation.
+ */
+public class YangJavaUnion
+        extends YangUnion
+        implements JavaCodeGeneratorInfo, JavaCodeGenerator {
+
+    private static final long serialVersionUID = 806201619L;
+
+    /**
+     * Contains the information of the java file being generated.
+     */
+    private JavaFileInfo javaFileInfo;
+
+    /**
+     * File handle to maintain temporary java code fragments as per the code
+     * snippet types.
+     */
+    private transient TempJavaCodeFragmentFiles tempFileHandle;
+
+    /**
+     * Creates an instance of YANG java union.
+     */
+    public YangJavaUnion() {
+        super();
+        setJavaFileInfo(new JavaFileInfo());
+        getJavaFileInfo().setGeneratedFileTypes(GENERATE_UNION_CLASS);
+    }
+
+    /**
+     * Returns the generated java file information.
+     *
+     * @return generated java file information
+     */
+    @Override
+    public JavaFileInfo getJavaFileInfo() {
+        if (javaFileInfo == null) {
+            throw new RuntimeException("Missing java info in java datamodel node");
+        }
+        return javaFileInfo;
+    }
+
+    /**
+     * Sets the java file info object.
+     *
+     * @param javaInfo java file info object
+     */
+    @Override
+    public void setJavaFileInfo(JavaFileInfo javaInfo) {
+        javaFileInfo = javaInfo;
+    }
+
+    /**
+     * Returns the temporary file handle.
+     *
+     * @return temporary file handle
+     */
+    @Override
+    public TempJavaCodeFragmentFiles getTempJavaCodeFragmentFiles() {
+        return tempFileHandle;
+    }
+
+    /**
+     * Sets temporary file handle.
+     *
+     * @param fileHandle temporary file handle
+     */
+    @Override
+    public void setTempJavaCodeFragmentFiles(TempJavaCodeFragmentFiles fileHandle) {
+        tempFileHandle = fileHandle;
+    }
+
+    /**
+     * Prepare the information for java code generation corresponding to YANG
+     * union info.
+     *
+     * @param yangPlugin YANG plugin config
+     * @throws TranslatorException when fails to translate
+     */
+    @Override
+    public void generateCodeEntry(YangPluginConfig yangPlugin) throws TranslatorException {
+        try {
+            generateCodeOfNode(this, yangPlugin);
+        } catch (IOException e) {
+            throw new TranslatorException(
+                    "Failed to prepare generate code entry for union node " + getName());
+        }
+
+    }
+
+    /**
+     * Creates a java file using the YANG union info.
+     *
+     * @throws TranslatorException when fails to translate
+     */
+    @Override
+    public void generateCodeExit() throws TranslatorException {
+        try {
+            getTempJavaCodeFragmentFiles().generateJavaFile(GENERATE_UNION_CLASS, this);
+        } catch (IOException e) {
+            throw new TranslatorException("Failed to generate code for union node " + getName());
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/YangJavaUses.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/YangJavaUses.java
new file mode 100644
index 0000000..f6166a5
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/YangJavaUses.java
@@ -0,0 +1,155 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.yangutils.translator.tojava.javamodel;
+
+import java.io.IOException;
+import java.util.List;
+
+import org.onosproject.yangutils.datamodel.YangGrouping;
+import org.onosproject.yangutils.datamodel.YangLeaf;
+import org.onosproject.yangutils.datamodel.YangLeafList;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangUses;
+import org.onosproject.yangutils.translator.exception.TranslatorException;
+import org.onosproject.yangutils.translator.tojava.JavaCodeGenerator;
+import org.onosproject.yangutils.translator.tojava.JavaFileInfo;
+import org.onosproject.yangutils.translator.tojava.TempJavaCodeFragmentFiles;
+import org.onosproject.yangutils.translator.tojava.utils.YangPluginConfig;
+
+import static org.onosproject.yangutils.datamodel.utils.DataModelUtils.getParentNodeInGenCode;
+import static org.onosproject.yangutils.translator.tojava.TempJavaFragmentFiles.addCurNodeAsAttributeInTargetTempFile;
+import static org.onosproject.yangutils.translator.tojava.utils.YangJavaModelUtils.updatePackageInfo;
+
+/**
+ * Represents uses information extended to support java code generation.
+ */
+public class YangJavaUses
+        extends YangUses
+        implements JavaCodeGeneratorInfo, JavaCodeGenerator {
+
+    private static final long serialVersionUID = 806201618L;
+
+    /**
+     * Contains the information of the java file being generated.
+     */
+    private JavaFileInfo javaFileInfo;
+
+    /**
+     * File handle to maintain temporary java code fragments as per the code
+     * snippet types.
+     */
+    private transient TempJavaCodeFragmentFiles tempFileHandle;
+
+    /**
+     * Creates YANG java uses object.
+     */
+    public YangJavaUses() {
+        super();
+        setJavaFileInfo(new JavaFileInfo());
+    }
+
+    /**
+     * Returns the generated java file information.
+     *
+     * @return generated java file information
+     */
+    @Override
+    public JavaFileInfo getJavaFileInfo() {
+        if (javaFileInfo == null) {
+            throw new TranslatorException("Missing java info in java datamodel node");
+        }
+        return javaFileInfo;
+    }
+
+    /**
+     * Sets the java file info object.
+     *
+     * @param javaInfo java file info object
+     */
+    @Override
+    public void setJavaFileInfo(JavaFileInfo javaInfo) {
+        javaFileInfo = javaInfo;
+    }
+
+    /**
+     * Returns the temporary file handle.
+     *
+     * @return temporary file handle
+     */
+    @Override
+    public TempJavaCodeFragmentFiles getTempJavaCodeFragmentFiles() {
+        return tempFileHandle;
+    }
+
+    /**
+     * Sets temporary file handle.
+     *
+     * @param fileHandle temporary file handle
+     */
+    @Override
+    public void setTempJavaCodeFragmentFiles(TempJavaCodeFragmentFiles fileHandle) {
+        tempFileHandle = fileHandle;
+    }
+
+    @Override
+    public void generateCodeEntry(YangPluginConfig yangPlugin)
+            throws TranslatorException {
+        try {
+            updatePackageInfo(this, yangPlugin);
+
+            if (!(getParentNodeInGenCode(this) instanceof JavaCodeGeneratorInfo)) {
+                throw new TranslatorException("invalid container of uses");
+            }
+            JavaCodeGeneratorInfo javaCodeGeneratorInfo = (JavaCodeGeneratorInfo) getParentNodeInGenCode(this);
+
+            if (javaCodeGeneratorInfo instanceof YangGrouping) {
+                /*
+                 * Do nothing, since it will taken care in the groupings uses.
+                 */
+                return;
+            }
+
+            for (List<YangLeaf> leavesList : getUsesResolvedLeavesList()) {
+                // add the resolved leaves to the parent as an attribute
+                javaCodeGeneratorInfo.getTempJavaCodeFragmentFiles()
+                        .getBeanTempFiles().addLeavesInfoToTempFiles(leavesList, yangPlugin);
+            }
+
+            for (List<YangLeafList> listOfLeafLists : getUsesResolvedListOfLeafList()) {
+                // add the resolved leaf-list to the parent as an attribute
+                javaCodeGeneratorInfo.getTempJavaCodeFragmentFiles()
+                        .getBeanTempFiles().addLeafListInfoToTempFiles(listOfLeafLists, yangPlugin);
+            }
+
+            for (YangNode usesResolvedNode : getUsesResolvedNodeList()) {
+                // add the resolved nodes to the parent as an attribute
+                addCurNodeAsAttributeInTargetTempFile(usesResolvedNode, yangPlugin,
+                        getParentNodeInGenCode(this));
+            }
+
+        } catch (IOException e) {
+            throw new TranslatorException(e.getCause());
+        }
+    }
+
+    @Override
+    public void generateCodeExit()
+            throws TranslatorException {
+        /*
+         * Do nothing.
+         */
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/package-info.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/package-info.java
new file mode 100644
index 0000000..3257922
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/javamodel/package-info.java
@@ -0,0 +1,20 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License"); you may not
+ * use this file except in compliance with the License. You may obtain a copy of
+ * the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
+ * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
+ * License for the specific language governing permissions and limitations under
+ * the License.
+ */
+
+/**
+ * Maintains application's schema mapped to java classes / interfaces.
+ */
+package org.onosproject.yangutils.translator.tojava.javamodel;
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/package-info.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/package-info.java
new file mode 100644
index 0000000..1aac09e
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/package-info.java
@@ -0,0 +1,20 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Generates java class definition from data model.
+ */
+package org.onosproject.yangutils.translator.tojava;
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/utils/AttributesJavaDataType.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/utils/AttributesJavaDataType.java
new file mode 100644
index 0000000..19ed11d
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/utils/AttributesJavaDataType.java
@@ -0,0 +1,506 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.translator.tojava.utils;
+
+import java.util.Stack;
+
+import org.onosproject.yangutils.datamodel.YangDataTypes;
+import org.onosproject.yangutils.datamodel.YangDerivedInfo;
+import org.onosproject.yangutils.datamodel.YangEnumeration;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangType;
+import org.onosproject.yangutils.datamodel.YangTypeDef;
+import org.onosproject.yangutils.datamodel.YangUnion;
+import org.onosproject.yangutils.translator.exception.TranslatorException;
+import org.onosproject.yangutils.translator.tojava.JavaFileInfo;
+import org.onosproject.yangutils.translator.tojava.JavaFileInfoContainer;
+import org.onosproject.yangutils.translator.tojava.javamodel.JavaCodeGeneratorInfo;
+import org.onosproject.yangutils.translator.tojava.javamodel.YangJavaEnumeration;
+import org.onosproject.yangutils.translator.tojava.javamodel.YangJavaModule;
+import org.onosproject.yangutils.translator.tojava.javamodel.YangJavaSubModule;
+import org.onosproject.yangutils.translator.tojava.javamodel.YangJavaTypeDef;
+import org.onosproject.yangutils.translator.tojava.javamodel.YangJavaUnion;
+
+import static org.onosproject.yangutils.translator.tojava.utils.JavaIdentifierSyntax.getCamelCase;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaIdentifierSyntax.getCapitalCase;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaIdentifierSyntax.getCurNodePackage;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaIdentifierSyntax.getPackageDirPathFromJavaJPackage;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaIdentifierSyntax.getRootPackage;
+import static org.onosproject.yangutils.utils.UtilConstants.BIG_INTEGER;
+import static org.onosproject.yangutils.utils.UtilConstants.BOOLEAN_DATA_TYPE;
+import static org.onosproject.yangutils.utils.UtilConstants.BOOLEAN_WRAPPER;
+import static org.onosproject.yangutils.utils.UtilConstants.BYTE;
+import static org.onosproject.yangutils.utils.UtilConstants.BYTE_WRAPPER;
+import static org.onosproject.yangutils.utils.UtilConstants.EMPTY_STRING;
+import static org.onosproject.yangutils.utils.UtilConstants.FROM_STRING_METHOD_NAME;
+import static org.onosproject.yangutils.utils.UtilConstants.INT;
+import static org.onosproject.yangutils.utils.UtilConstants.INTEGER_WRAPPER;
+import static org.onosproject.yangutils.utils.UtilConstants.JAVA_LANG;
+import static org.onosproject.yangutils.utils.UtilConstants.JAVA_MATH;
+import static org.onosproject.yangutils.utils.UtilConstants.LONG;
+import static org.onosproject.yangutils.utils.UtilConstants.LONG_WRAPPER;
+import static org.onosproject.yangutils.utils.UtilConstants.NEW;
+import static org.onosproject.yangutils.utils.UtilConstants.PARSE_BOOLEAN;
+import static org.onosproject.yangutils.utils.UtilConstants.PARSE_BYTE;
+import static org.onosproject.yangutils.utils.UtilConstants.PARSE_INT;
+import static org.onosproject.yangutils.utils.UtilConstants.PARSE_LONG;
+import static org.onosproject.yangutils.utils.UtilConstants.PARSE_SHORT;
+import static org.onosproject.yangutils.utils.UtilConstants.PERIOD;
+import static org.onosproject.yangutils.utils.UtilConstants.SHORT;
+import static org.onosproject.yangutils.utils.UtilConstants.SHORT_WRAPPER;
+import static org.onosproject.yangutils.utils.UtilConstants.SPACE;
+import static org.onosproject.yangutils.utils.UtilConstants.STRING_DATA_TYPE;
+import static org.onosproject.yangutils.utils.UtilConstants.YANG_BINARY_CLASS;
+import static org.onosproject.yangutils.utils.UtilConstants.YANG_BITS_CLASS;
+import static org.onosproject.yangutils.utils.UtilConstants.YANG_DECIMAL64_CLASS;
+import static org.onosproject.yangutils.utils.UtilConstants.YANG_TYPES_PKG;
+
+/**
+ * Represents java data types info corresponding to YANG type.
+ */
+public final class AttributesJavaDataType {
+
+    /**
+     * Creates an instance of attribute java data type.
+     */
+    private AttributesJavaDataType() {
+    }
+
+    /**
+     * Returns java type.
+     *
+     * @param yangType YANG type
+     * @return java type
+     */
+    public static String getJavaDataType(YangType<?> yangType) {
+
+        YangDataTypes type = yangType.getDataType();
+
+        switch (type) {
+            case INT8:
+                return BYTE;
+            case INT16:
+                return SHORT;
+            case INT32:
+                return INT;
+            case INT64:
+                return LONG;
+            case UINT8:
+                return SHORT;
+            case UINT16:
+                return INT;
+            case UINT32:
+                return LONG;
+            case UINT64:
+                return BIG_INTEGER;
+            case BINARY:
+                return YANG_BINARY_CLASS;
+            case DECIMAL64:
+                return YANG_DECIMAL64_CLASS;
+            case STRING:
+                return STRING_DATA_TYPE;
+            case BOOLEAN:
+                return BOOLEAN_DATA_TYPE;
+            default:
+                throw new TranslatorException("given data type is not supported.");
+        }
+    }
+
+    /**
+     * Returns from string method parsed string.
+     *
+     * @param targetDataType target data type
+     * @param yangType       YANG type
+     * @return parsed string
+     */
+    public static String getParseFromStringMethod(String targetDataType, YangType<?> yangType) {
+
+        YangDataTypes type = yangType.getDataType();
+
+        switch (type) {
+            case INT8:
+                return BYTE_WRAPPER + PERIOD + PARSE_BYTE;
+            case INT16:
+                return SHORT_WRAPPER + PERIOD + PARSE_SHORT;
+            case INT32:
+                return INTEGER_WRAPPER + PERIOD + PARSE_INT;
+            case INT64:
+                return LONG_WRAPPER + PERIOD + PARSE_LONG;
+            case UINT8:
+                return SHORT_WRAPPER + PERIOD + PARSE_SHORT;
+            case UINT16:
+                return INTEGER_WRAPPER + PERIOD + PARSE_INT;
+            case UINT32:
+                return LONG_WRAPPER + PERIOD + PARSE_LONG;
+            case UINT64:
+                return NEW + SPACE + BIG_INTEGER;
+            case STRING:
+                return EMPTY_STRING;
+            case EMPTY:
+            case BOOLEAN:
+                return BOOLEAN_WRAPPER + PERIOD + PARSE_BOOLEAN;
+            case DECIMAL64:
+            case BITS:
+            case BINARY:
+            case UNION:
+            case ENUMERATION:
+            case DERIVED:
+                return targetDataType + PERIOD + FROM_STRING_METHOD_NAME;
+            default:
+                throw new TranslatorException("given data type is not supported.");
+        }
+    }
+
+    /**
+     * Returns java import class.
+     *
+     * @param yangType     YANG type
+     * @param isListAttr   if the attribute need to be a list
+     * @param pluginConfig plugin configurations
+     * @return java import class
+     */
+    public static String getJavaImportClass(YangType<?> yangType, boolean isListAttr,
+            YangToJavaNamingConflictUtil pluginConfig) {
+
+        YangDataTypes type = yangType.getDataType();
+
+        if (isListAttr) {
+            switch (type) {
+                case INT8:
+                    return BYTE_WRAPPER;
+                case INT16:
+                    return SHORT_WRAPPER;
+                case INT32:
+                    return INTEGER_WRAPPER;
+                case INT64:
+                    return LONG_WRAPPER;
+                case UINT8:
+                    return SHORT_WRAPPER;
+                case UINT16:
+                    return INTEGER_WRAPPER;
+                case UINT32:
+                    return LONG_WRAPPER;
+                case UINT64:
+                    return BIG_INTEGER;
+                case DECIMAL64:
+                    return YANG_DECIMAL64_CLASS;
+                case STRING:
+                    return STRING_DATA_TYPE;
+                case BOOLEAN:
+                    return BOOLEAN_WRAPPER;
+                case ENUMERATION:
+                    return getCapitalCase(
+                            getCamelCase(((YangJavaEnumeration) yangType.getDataTypeExtendedInfo()).getName(),
+                                    pluginConfig));
+                case BITS:
+                    return YANG_BITS_CLASS;
+                case BINARY:
+                    return YANG_BINARY_CLASS;
+                case LEAFREF:
+                    //TODO:LEAFREF
+                    break;
+                case IDENTITYREF:
+                    //TODO:IDENTITYREF
+                    break;
+                case EMPTY:
+                    return BOOLEAN_WRAPPER;
+                case UNION:
+                    return getCapitalCase(getCamelCase(((YangJavaUnion) yangType.getDataTypeExtendedInfo()).getName(),
+                            pluginConfig));
+                case INSTANCE_IDENTIFIER:
+                    //TODO:INSTANCE_IDENTIFIER
+                    break;
+                case DERIVED:
+                    return getCapitalCase(
+                            getCamelCase(yangType.getDataTypeName(), pluginConfig));
+                default:
+                    throw new TranslatorException("given data type is not supported.");
+            }
+        } else {
+            switch (type) {
+                case UINT64:
+                    return BIG_INTEGER;
+                case DECIMAL64:
+                    return YANG_DECIMAL64_CLASS;
+                case STRING:
+                    return STRING_DATA_TYPE;
+                case ENUMERATION:
+                    return getCapitalCase(
+                            getCamelCase(((YangJavaEnumeration) yangType.getDataTypeExtendedInfo()).getName(),
+                                    pluginConfig));
+                case BITS:
+                    return YANG_BITS_CLASS;
+                case BINARY:
+                    return YANG_BINARY_CLASS;
+                case LEAFREF:
+                    //TODO:LEAFREF
+                    break;
+                case IDENTITYREF:
+                    //TODO:IDENTITYREF
+                    break;
+                case EMPTY:
+                    return BOOLEAN_DATA_TYPE;
+                case UNION:
+                    return getCapitalCase(getCamelCase(((YangJavaUnion) yangType.getDataTypeExtendedInfo()).getName(),
+                            pluginConfig));
+                case INSTANCE_IDENTIFIER:
+                    //TODO:INSTANCE_IDENTIFIER
+                    break;
+                case DERIVED:
+                    return getCapitalCase(
+                            getCamelCase(yangType.getDataTypeName(), pluginConfig));
+                default:
+                    return null;
+            }
+        }
+        return null;
+    }
+
+    /**
+     * Returns java import package.
+     *
+     * @param yangType         YANG type
+     * @param isListAttr       if the attribute is of list type
+     * @param conflictResolver object of YANG to java naming conflict util
+     * @return java import package
+     */
+    public static String getJavaImportPackage(YangType<?> yangType, boolean isListAttr,
+            YangToJavaNamingConflictUtil conflictResolver) {
+
+        YangDataTypes type = yangType.getDataType();
+
+        if (isListAttr) {
+            switch (type) {
+                case INT8:
+                case INT16:
+                case INT32:
+                case INT64:
+                case UINT8:
+                case UINT16:
+                case UINT32:
+                case STRING:
+                case BOOLEAN:
+                case EMPTY:
+                    return JAVA_LANG;
+                case UINT64:
+                    return JAVA_MATH;
+                case ENUMERATION:
+                    return getEnumsPackage(yangType, conflictResolver);
+                case DECIMAL64:
+                case BITS:
+                case BINARY:
+                    return YANG_TYPES_PKG;
+                case LEAFREF:
+                    //TODO:LEAFREF
+                    break;
+                case IDENTITYREF:
+                    //TODO:IDENTITYREF
+                    break;
+                case UNION:
+                    return getUnionPackage(yangType, conflictResolver);
+                case INSTANCE_IDENTIFIER:
+                    //TODO:INSTANCE_IDENTIFIER
+                    break;
+                case DERIVED:
+                    return getTypDefsPackage(yangType, conflictResolver);
+                default:
+                    throw new TranslatorException("given data type is not supported.");
+            }
+        } else {
+            switch (type) {
+                case UINT64:
+                    return JAVA_MATH;
+                case STRING:
+                    return JAVA_LANG;
+                case ENUMERATION:
+                    return getEnumsPackage(yangType, conflictResolver);
+                case DECIMAL64:
+                case BITS:
+                case BINARY:
+                    return YANG_TYPES_PKG;
+                case LEAFREF:
+                    //TODO:LEAFREF
+                    break;
+                case IDENTITYREF:
+                    //TODO:IDENTITYREF
+                    break;
+                case EMPTY:
+                    return JAVA_LANG;
+                case UNION:
+                    return getUnionPackage(yangType, conflictResolver);
+                case INSTANCE_IDENTIFIER:
+                    //TODO:INSTANCE_IDENTIFIER
+                    break;
+                case DERIVED:
+                    return getTypDefsPackage(yangType, conflictResolver);
+                default:
+                    return null;
+            }
+        }
+        return null;
+    }
+
+    /**
+     * Returns java package for typedef node.
+     *
+     * @param type             YANG type
+     * @param conflictResolver object of YANG to java naming conflict util
+     * @return java package for typedef node
+     */
+    private static String getTypDefsPackage(YangType<?> type, YangToJavaNamingConflictUtil conflictResolver) {
+        Object var = type.getDataTypeExtendedInfo();
+        if (!(var instanceof YangDerivedInfo)) {
+            throw new TranslatorException("type should have been derived.");
+        }
+
+        if (!(((YangDerivedInfo<?>) var).getReferredTypeDef() instanceof YangTypeDef)) {
+            throw new TranslatorException("derived info is not an instance of typedef.");
+        }
+
+        YangJavaTypeDef typedef = (YangJavaTypeDef) ((YangDerivedInfo<?>) var).getReferredTypeDef();
+        if (typedef.getJavaFileInfo().getPackage() == null) {
+            return getPackageFromParent(typedef.getParent(), conflictResolver);
+        }
+        return typedef.getJavaFileInfo().getPackage();
+    }
+
+    /**
+     * Returns java package for union node.
+     *
+     * @param type             YANG type
+     * @param conflictResolver object of YANG to java naming conflict util
+     * @return java package for union node
+     */
+    private static String getUnionPackage(YangType<?> type, YangToJavaNamingConflictUtil conflictResolver) {
+
+        if (!(type.getDataTypeExtendedInfo() instanceof YangUnion)) {
+            throw new TranslatorException("type should have been union.");
+        }
+
+        YangJavaUnion union = (YangJavaUnion) type.getDataTypeExtendedInfo();
+        if (union.getJavaFileInfo().getPackage() == null) {
+            return getPackageFromParent(union.getParent(), conflictResolver);
+        }
+        return union.getJavaFileInfo().getPackage();
+    }
+
+    /**
+     * Returns YANG enumeration's java package.
+     *
+     * @param type             YANG type
+     * @param conflictResolver object of YANG to java naming conflict util
+     * @return YANG enumeration's java package
+     */
+    private static String getEnumsPackage(YangType<?> type, YangToJavaNamingConflictUtil conflictResolver) {
+
+        if (!(type.getDataTypeExtendedInfo() instanceof YangEnumeration)) {
+            throw new TranslatorException("type should have been enumeration.");
+        }
+        YangJavaEnumeration enumeration = (YangJavaEnumeration) type.getDataTypeExtendedInfo();
+        if (enumeration.getJavaFileInfo().getPackage() == null) {
+            return getPackageFromParent(enumeration.getParent(), conflictResolver);
+        }
+        return enumeration.getJavaFileInfo().getPackage();
+    }
+
+    /**
+     * Returns package from parent node.
+     *
+     * @param parent           parent YANG node
+     * @param conflictResolver object of YANG to java naming conflict util
+     * @return java package from parent node
+     */
+    private static String getPackageFromParent(YangNode parent,
+            YangToJavaNamingConflictUtil conflictResolver) {
+        if (!(parent instanceof JavaFileInfoContainer)) {
+            throw new TranslatorException("invalid child node is being processed.");
+        }
+        JavaFileInfo parentInfo = ((JavaFileInfoContainer) parent).getJavaFileInfo();
+        if (parentInfo.getPackage() == null) {
+            updateJavaFileInfo(parent, conflictResolver);
+        }
+        return parentInfo.getPackage() + PERIOD + parentInfo.getJavaName().toLowerCase();
+    }
+
+    /**
+     * Update the referred data model nodes java file info, this will be called,
+     * when the linked node is yet to translate. Then resolve until the parent hierarchy.
+     *
+     * @param yangNode         node whose java info needs to be updated
+     * @param conflictResolver yang plugin config
+     */
+    public static void updateJavaFileInfo(YangNode yangNode,
+            YangToJavaNamingConflictUtil conflictResolver) {
+        Stack<YangNode> nodesToUpdatePackage = new Stack<YangNode>();
+
+        /*
+         * Add the nodes to be updated for package info in a stack.
+         */
+        while (yangNode != null
+                && ((JavaFileInfoContainer) yangNode)
+                .getJavaFileInfo().getPackage() == null) {
+            nodesToUpdatePackage.push(yangNode);
+            yangNode = yangNode.getParent();
+        }
+
+        /*
+         * If the package is not updated till root node, then root package needs to
+         * be updated.
+         */
+        if (yangNode == null) {
+            yangNode = nodesToUpdatePackage.pop();
+            String pkg;
+            if (yangNode instanceof YangJavaModule) {
+                YangJavaModule module = (YangJavaModule) yangNode;
+                pkg = getRootPackage(module.getVersion(), module.getNameSpace().getUri(), module
+                        .getRevision().getRevDate(), conflictResolver);
+            } else if (yangNode instanceof YangJavaSubModule) {
+                YangJavaSubModule submodule = (YangJavaSubModule) yangNode;
+                pkg = getRootPackage(submodule.getVersion(),
+                        submodule.getNameSpaceFromModule(submodule.getBelongsTo()),
+                        submodule.getRevision().getRevDate(), conflictResolver);
+            } else {
+                throw new TranslatorException("Invalid root node of data model tree");
+            }
+
+            ((JavaCodeGeneratorInfo) yangNode).getJavaFileInfo()
+                    .setJavaName(getCamelCase(yangNode.getName(), conflictResolver));
+            ((JavaCodeGeneratorInfo) yangNode).getJavaFileInfo()
+                    .setPackage(pkg);
+            ((JavaCodeGeneratorInfo) yangNode).getJavaFileInfo()
+                    .setPackageFilePath(getPackageDirPathFromJavaJPackage(
+                            ((JavaCodeGeneratorInfo) yangNode).getJavaFileInfo()
+                                    .getPackage()));
+        }
+
+        /**
+         * Parent of the node in stack is updated with java info,
+         * all the nodes can be popped and updated
+         */
+        while (nodesToUpdatePackage.size() != 0) {
+            yangNode = nodesToUpdatePackage.pop();
+            ((JavaCodeGeneratorInfo) yangNode).getJavaFileInfo()
+                    .setJavaName(getCamelCase(yangNode.getName(), conflictResolver));
+            ((JavaCodeGeneratorInfo) yangNode).getJavaFileInfo()
+                    .setPackage(getCurNodePackage(yangNode));
+            ((JavaCodeGeneratorInfo) yangNode).getJavaFileInfo()
+                    .setPackageFilePath(getPackageDirPathFromJavaJPackage(
+                            ((JavaCodeGeneratorInfo) yangNode).getJavaFileInfo()
+                                    .getPackage()));
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/utils/ClassDefinitionGenerator.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/utils/ClassDefinitionGenerator.java
new file mode 100644
index 0000000..dde4b03
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/utils/ClassDefinitionGenerator.java
@@ -0,0 +1,301 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.translator.tojava.utils;
+
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.translator.tojava.JavaQualifiedTypeInfo;
+import org.onosproject.yangutils.translator.tojava.TempJavaCodeFragmentFilesContainer;
+import org.onosproject.yangutils.translator.tojava.javamodel.YangJavaNotification;
+
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.BUILDER_CLASS_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.BUILDER_INTERFACE_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.GENERATE_ENUM_CLASS;
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.GENERATE_EVENT_CLASS;
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.GENERATE_EVENT_LISTENER_INTERFACE;
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.GENERATE_EVENT_SUBJECT_CLASS;
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.GENERATE_SERVICE_AND_MANAGER;
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.GENERATE_TYPEDEF_CLASS;
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.GENERATE_UNION_CLASS;
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.IMPL_CLASS_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.INTERFACE_MASK;
+import static org.onosproject.yangutils.utils.UtilConstants.BUILDER;
+import static org.onosproject.yangutils.utils.UtilConstants.CLASS;
+import static org.onosproject.yangutils.utils.UtilConstants.COMMA;
+import static org.onosproject.yangutils.utils.UtilConstants.DIAMOND_CLOSE_BRACKET;
+import static org.onosproject.yangutils.utils.UtilConstants.DIAMOND_OPEN_BRACKET;
+import static org.onosproject.yangutils.utils.UtilConstants.EIGHT_SPACE_INDENTATION;
+import static org.onosproject.yangutils.utils.UtilConstants.ENUM;
+import static org.onosproject.yangutils.utils.UtilConstants.EVENT_LISTENER_STRING;
+import static org.onosproject.yangutils.utils.UtilConstants.EVENT_STRING;
+import static org.onosproject.yangutils.utils.UtilConstants.EXTEND;
+import static org.onosproject.yangutils.utils.UtilConstants.FINAL;
+import static org.onosproject.yangutils.utils.UtilConstants.IMPL;
+import static org.onosproject.yangutils.utils.UtilConstants.IMPLEMENTS;
+import static org.onosproject.yangutils.utils.UtilConstants.INTERFACE;
+import static org.onosproject.yangutils.utils.UtilConstants.LISTENER_REG;
+import static org.onosproject.yangutils.utils.UtilConstants.LISTENER_SERVICE;
+import static org.onosproject.yangutils.utils.UtilConstants.MANAGER;
+import static org.onosproject.yangutils.utils.UtilConstants.NEW_LINE;
+import static org.onosproject.yangutils.utils.UtilConstants.OPEN_CURLY_BRACKET;
+import static org.onosproject.yangutils.utils.UtilConstants.PERIOD;
+import static org.onosproject.yangutils.utils.UtilConstants.PUBLIC;
+import static org.onosproject.yangutils.utils.UtilConstants.REGEX_FOR_ANY_STRING_ENDING_WITH_SERVICE;
+import static org.onosproject.yangutils.utils.UtilConstants.SERVICE;
+import static org.onosproject.yangutils.utils.UtilConstants.SPACE;
+import static org.onosproject.yangutils.utils.UtilConstants.SUBJECT;
+import static org.onosproject.yangutils.utils.io.impl.YangIoUtils.trimAtLast;
+
+/**
+ * Represents generator for class definition of generated files.
+ */
+public final class ClassDefinitionGenerator {
+
+    /**
+     * Creates an instance of class definition generator.
+     */
+    private ClassDefinitionGenerator() {
+    }
+
+    /**
+     * Based on the file type and the YANG name of the file, generate the class
+     * / interface definition start.
+     *
+     * @param genFileTypes generated file type
+     * @param yangName class name
+     * @return class definition
+     */
+    public static String generateClassDefinition(int genFileTypes, String yangName) {
+
+        /**
+         * Based on the file type and the YANG name of the file, generate the
+         * class / interface definition start.
+         */
+        switch (genFileTypes) {
+        case BUILDER_CLASS_MASK:
+            return getBuilderClassDefinition(yangName);
+        case IMPL_CLASS_MASK:
+            return getImplClassDefinition(yangName);
+        case BUILDER_INTERFACE_MASK:
+            return getBuilderInterfaceDefinition(yangName);
+        case GENERATE_TYPEDEF_CLASS:
+        case GENERATE_UNION_CLASS:
+            return getTypeClassDefinition(yangName);
+        case GENERATE_ENUM_CLASS:
+            return getEnumClassDefinition(yangName);
+        default:
+            return null;
+        }
+    }
+
+    /**
+     * Based on the file type and the YANG name of the file, generate the class
+     * / interface definition start.
+     *
+     * @param genFileTypes generated file type
+     * @param yangName class name
+     * @param curNode current YANG node
+     * @return class definition
+     */
+    public static String generateClassDefinition(int genFileTypes, String yangName, YangNode curNode) {
+
+        /**
+         * Based on the file type and the YANG name of the file, generate the
+         * class / interface definition start.
+         */
+        switch (genFileTypes) {
+        case INTERFACE_MASK:
+            return getInterfaceDefinition(yangName, curNode);
+        case GENERATE_SERVICE_AND_MANAGER:
+            return getRpcInterfaceDefinition(yangName, curNode);
+        case GENERATE_EVENT_CLASS:
+            String eventName = yangName + SUBJECT;
+            return getEventDefinition(yangName, eventName);
+        case GENERATE_EVENT_LISTENER_INTERFACE:
+            return getEventListenerDefinition(yangName);
+        case GENERATE_EVENT_SUBJECT_CLASS:
+            return getClassDefinition(yangName);
+        default:
+            return null;
+        }
+    }
+
+    /**
+     * Returns enum file class definition.
+     *
+     * @param yangName class name
+     * @return enum file class definition
+     */
+    private static String getEnumClassDefinition(String yangName) {
+        return PUBLIC + SPACE + ENUM + SPACE + yangName + SPACE + OPEN_CURLY_BRACKET + NEW_LINE;
+    }
+
+    /**
+     * Returns interface file class definition.
+     *
+     * @param yangName file name
+     * @return definition
+     */
+    private static String getInterfaceDefinition(String yangName, YangNode curNode) {
+        JavaExtendsListHolder holder = ((TempJavaCodeFragmentFilesContainer) curNode)
+                .getTempJavaCodeFragmentFiles().getBeanTempFiles().getJavaExtendsListHolder();
+
+        if (holder.getExtendsList() != null && !holder.getExtendsList().isEmpty()) {
+            String def = PUBLIC + SPACE + INTERFACE + SPACE + yangName + SPACE + EXTEND + SPACE;
+            for (JavaQualifiedTypeInfo info : holder.getExtendsList()) {
+                if (!holder.getExtendedClassStore().get(info)) {
+                    def = def + info.getClassInfo() + COMMA + SPACE;
+                } else {
+                    def = def + info.getPkgInfo() + PERIOD + info.getClassInfo() + COMMA + SPACE;
+                }
+            }
+
+            def = trimAtLast(def, COMMA);
+
+            return def + SPACE + OPEN_CURLY_BRACKET + NEW_LINE;
+        }
+        return PUBLIC + SPACE + INTERFACE + SPACE + yangName + SPACE + OPEN_CURLY_BRACKET + NEW_LINE;
+    }
+
+    /**
+     * Returns builder interface file class definition.
+     *
+     * @param yangName java class name, corresponding to which the builder class
+     * is being generated
+     * @return definition
+     */
+    private static String getBuilderInterfaceDefinition(String yangName) {
+        return INTERFACE + SPACE + yangName + BUILDER + SPACE + OPEN_CURLY_BRACKET + NEW_LINE + NEW_LINE;
+    }
+
+    /**
+     * Returns builder file class definition.
+     *
+     * @param yangName file name
+     * @return definition
+     */
+    private static String getBuilderClassDefinition(String yangName) {
+        return PUBLIC + SPACE + CLASS + SPACE + yangName + BUILDER + SPACE + IMPLEMENTS + SPACE + yangName + PERIOD
+                + yangName + BUILDER + SPACE + OPEN_CURLY_BRACKET + NEW_LINE;
+    }
+
+    /**
+     * Returns impl file class definition.
+     *
+     * @param yangName file name
+     * @return definition
+     */
+    private static String getImplClassDefinition(String yangName) {
+        return PUBLIC + SPACE + FINAL + SPACE + CLASS + SPACE + yangName + IMPL + SPACE + IMPLEMENTS + SPACE
+                + yangName + SPACE + OPEN_CURLY_BRACKET + NEW_LINE;
+    }
+
+    /**
+     * Returns impl file class definition.
+     *
+     * @param yangName file name
+     * @return definition
+     */
+    private static String getClassDefinition(String yangName) {
+        return PUBLIC + SPACE + CLASS + SPACE + yangName + SPACE + OPEN_CURLY_BRACKET + NEW_LINE;
+    }
+
+    /**
+     * Returns type file class definition.
+     *
+     * @param yangName file name
+     * @return definition
+     */
+    private static String getTypeClassDefinition(String yangName) {
+        return PUBLIC + SPACE + FINAL + SPACE + CLASS + SPACE + yangName + SPACE + OPEN_CURLY_BRACKET + NEW_LINE;
+    }
+
+    /**
+     * Returns RPC file interface definition.
+     *
+     * @param yangName file name
+     * @param curNode current YANG node
+     * @return definition
+     */
+    private static String getRpcInterfaceDefinition(String yangName, YangNode curNode) {
+        JavaExtendsListHolder holder = ((TempJavaCodeFragmentFilesContainer) curNode)
+                .getTempJavaCodeFragmentFiles().getServiceTempFiles().getJavaExtendsListHolder();
+        if (holder.getExtendsList() != null && !holder.getExtendsList().isEmpty()) {
+            curNode = curNode.getChild();
+            while (curNode != null) {
+                if (curNode instanceof YangJavaNotification) {
+                    return getRpcInterfaceDefinitionWhenItExtends(yangName, holder);
+                }
+                curNode = curNode.getNextSibling();
+            }
+        }
+        if (yangName.matches(REGEX_FOR_ANY_STRING_ENDING_WITH_SERVICE)) {
+            return PUBLIC + SPACE + INTERFACE + SPACE + yangName + SPACE + OPEN_CURLY_BRACKET + NEW_LINE;
+        }
+        return PUBLIC + SPACE + CLASS + SPACE + yangName + SPACE + IMPLEMENTS + SPACE
+                + yangName.substring(0, yangName.length() - 7) + SERVICE + SPACE + OPEN_CURLY_BRACKET + NEW_LINE;
+    }
+
+    /* Provides class definition when RPC interface needs to extends any event.*/
+    private static String getRpcInterfaceDefinitionWhenItExtends(String yangName,
+            JavaExtendsListHolder holder) {
+
+        if (yangName.matches(REGEX_FOR_ANY_STRING_ENDING_WITH_SERVICE)) {
+            String[] strArray = yangName.split(SERVICE);
+            return PUBLIC + SPACE + INTERFACE + SPACE + yangName + NEW_LINE + EIGHT_SPACE_INDENTATION
+                    + EXTEND + SPACE + LISTENER_SERVICE + DIAMOND_OPEN_BRACKET + strArray[0] + EVENT_STRING + COMMA
+                    + SPACE + strArray[0] + EVENT_LISTENER_STRING + DIAMOND_CLOSE_BRACKET + SPACE
+                    + OPEN_CURLY_BRACKET + NEW_LINE;
+        }
+        yangName = yangName.substring(0, yangName.length() - 7);
+        return PUBLIC + SPACE + CLASS + SPACE + yangName + MANAGER + NEW_LINE + EIGHT_SPACE_INDENTATION
+                + EXTEND + SPACE + LISTENER_REG + DIAMOND_OPEN_BRACKET + yangName + EVENT_STRING + COMMA + SPACE
+                + yangName + EVENT_LISTENER_STRING + DIAMOND_CLOSE_BRACKET + NEW_LINE
+                + EIGHT_SPACE_INDENTATION + IMPLEMENTS + SPACE + yangName + SERVICE + SPACE + OPEN_CURLY_BRACKET
+                + NEW_LINE;
+    }
+
+    /**
+     * Returns event class definition.
+     *
+     * @param javaName file name
+     * @return definition
+     */
+    private static String getEventDefinition(String javaName, String eventName) {
+        String classDef = PUBLIC + SPACE + CLASS + SPACE + javaName + SPACE + "extends AbstractEvent<"
+                + javaName + ".Type, " + eventName + ">" + SPACE + OPEN_CURLY_BRACKET + NEW_LINE;
+
+        return classDef;
+    }
+
+    /**
+     * Returns event listener interface definition.
+     *
+     * @param javaName file name
+     * @return definition
+     */
+    private static String getEventListenerDefinition(String javaName) {
+        String intfDef = PUBLIC + SPACE + INTERFACE + SPACE + javaName + SPACE + "extends EventListener<"
+                + javaName;
+        if (intfDef.length() < 8) {
+            throw new RuntimeException("Event listener interface name is error");
+        }
+        intfDef = intfDef.substring(0, intfDef.length() - 8);
+        intfDef = intfDef + "Event>" + SPACE + OPEN_CURLY_BRACKET + NEW_LINE;
+
+        return intfDef;
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/utils/JavaCodeSnippetGen.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/utils/JavaCodeSnippetGen.java
new file mode 100644
index 0000000..b254e87
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/utils/JavaCodeSnippetGen.java
@@ -0,0 +1,157 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.translator.tojava.utils;
+
+import org.onosproject.yangutils.translator.tojava.JavaQualifiedTypeInfo;
+
+import static org.onosproject.yangutils.translator.tojava.utils.JavaIdentifierSyntax.getEnumJavaAttribute;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaIdentifierSyntax.getSmallCase;
+import static org.onosproject.yangutils.utils.UtilConstants.ARRAY_LIST;
+import static org.onosproject.yangutils.utils.UtilConstants.AUGMENTED_INFO;
+import static org.onosproject.yangutils.utils.UtilConstants.CLOSE_CURLY_BRACKET;
+import static org.onosproject.yangutils.utils.UtilConstants.CLOSE_PARENTHESIS;
+import static org.onosproject.yangutils.utils.UtilConstants.COMMA;
+import static org.onosproject.yangutils.utils.UtilConstants.DIAMOND_CLOSE_BRACKET;
+import static org.onosproject.yangutils.utils.UtilConstants.DIAMOND_OPEN_BRACKET;
+import static org.onosproject.yangutils.utils.UtilConstants.EQUAL;
+import static org.onosproject.yangutils.utils.UtilConstants.FOUR_SPACE_INDENTATION;
+import static org.onosproject.yangutils.utils.UtilConstants.IMPORT;
+import static org.onosproject.yangutils.utils.UtilConstants.LIST;
+import static org.onosproject.yangutils.utils.UtilConstants.NEW;
+import static org.onosproject.yangutils.utils.UtilConstants.NEW_LINE;
+import static org.onosproject.yangutils.utils.UtilConstants.OPEN_PARENTHESIS;
+import static org.onosproject.yangutils.utils.UtilConstants.PERIOD;
+import static org.onosproject.yangutils.utils.UtilConstants.PRIVATE;
+import static org.onosproject.yangutils.utils.UtilConstants.SEMI_COLAN;
+import static org.onosproject.yangutils.utils.UtilConstants.SPACE;
+import static org.onosproject.yangutils.utils.io.impl.JavaDocGen.getJavaDoc;
+import static org.onosproject.yangutils.utils.io.impl.JavaDocGen.JavaDocType.ENUM_ATTRIBUTE;
+
+/**
+ * Represents utility class to generate the java snippet.
+ */
+public final class JavaCodeSnippetGen {
+
+    /**
+     * Creates an instance of java code snippet gen.
+     */
+    private JavaCodeSnippetGen() {
+    }
+
+    /**
+     * Returns the java file header comment.
+     *
+     * @return the java file header comment
+     */
+    public static String getFileHeaderComment() {
+
+        /**
+         * TODO return the file header.
+         */
+        return null;
+    }
+
+    /**
+     * Returns the textual java code information corresponding to the import list.
+     *
+     * @param importInfo import info
+     * @return the textual java code information corresponding to the import
+     *         list
+     */
+    public static String getImportText(JavaQualifiedTypeInfo importInfo) {
+        return IMPORT + importInfo.getPkgInfo() + PERIOD + importInfo.getClassInfo() + SEMI_COLAN + NEW_LINE;
+    }
+
+    /**
+     * Returns the textual java code for attribute definition in class.
+     *
+     * @param javaAttributeTypePkg Package of the attribute type
+     * @param javaAttributeType java attribute type
+     * @param javaAttributeName name of the attribute
+     * @param isList is list attribute
+     * @return the textual java code for attribute definition in class
+     */
+    public static String getJavaAttributeDefination(String javaAttributeTypePkg, String javaAttributeType,
+            String javaAttributeName, boolean isList) {
+
+        String attributeDefination = PRIVATE + SPACE;
+
+        if (!isList) {
+            if (javaAttributeTypePkg != null) {
+                attributeDefination = attributeDefination + javaAttributeTypePkg + PERIOD;
+            }
+
+            attributeDefination = attributeDefination + javaAttributeType + SPACE + javaAttributeName + SEMI_COLAN
+                    + NEW_LINE;
+        } else {
+            attributeDefination = attributeDefination + LIST + DIAMOND_OPEN_BRACKET;
+            if (javaAttributeTypePkg != null) {
+                attributeDefination = attributeDefination + javaAttributeTypePkg + PERIOD;
+            }
+
+            attributeDefination = attributeDefination + javaAttributeType + DIAMOND_CLOSE_BRACKET + SPACE
+                    + javaAttributeName + SEMI_COLAN + NEW_LINE;
+        }
+        return attributeDefination;
+    }
+
+    /**
+     * Returns list attribute string.
+     *
+     * @param type attribute type
+     * @return list attribute string
+     */
+    public static String getListAttribute(String type) {
+        return LIST + DIAMOND_OPEN_BRACKET + type + DIAMOND_CLOSE_BRACKET;
+    }
+
+    /**
+     * Returns attribute of augmented info for generated impl file.
+     *
+     * @return attribute of augmented info for generated impl file
+     */
+    public static String getAugmentedInfoAttribute() {
+        return NEW_LINE + FOUR_SPACE_INDENTATION + PRIVATE + SPACE + getListAttribute(AUGMENTED_INFO) + SPACE
+                + getSmallCase(AUGMENTED_INFO) + LIST + SPACE + EQUAL + SPACE + NEW + SPACE + ARRAY_LIST
+                + DIAMOND_OPEN_BRACKET + DIAMOND_CLOSE_BRACKET + OPEN_PARENTHESIS + CLOSE_PARENTHESIS + SEMI_COLAN;
+    }
+
+    /**
+     * Returns based on the file type and the YANG name of the file, generate the class
+     * / interface definition close.
+     *
+     * @return corresponding textual java code information
+     */
+    public static String getJavaClassDefClose() {
+        return CLOSE_CURLY_BRACKET;
+    }
+
+    /**
+     * Returns string for enum's attribute.
+     *
+     * @param name name of attribute
+     * @param value value of the enum
+     * @param pluginConfig plugin configurations
+     * @return string for enum's attribute
+     */
+    public static String generateEnumAttributeString(String name, int value, YangPluginConfig pluginConfig) {
+        return getJavaDoc(ENUM_ATTRIBUTE, name, false, pluginConfig) + FOUR_SPACE_INDENTATION
+                + getEnumJavaAttribute(name).toUpperCase() + OPEN_PARENTHESIS
+                + value + CLOSE_PARENTHESIS + COMMA + NEW_LINE;
+    }
+
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/utils/JavaExtendsListHolder.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/utils/JavaExtendsListHolder.java
new file mode 100644
index 0000000..36986b8
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/utils/JavaExtendsListHolder.java
@@ -0,0 +1,114 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.translator.tojava.utils;
+
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.translator.tojava.JavaFileInfo;
+import org.onosproject.yangutils.translator.tojava.JavaFileInfoContainer;
+import org.onosproject.yangutils.translator.tojava.JavaImportData;
+import org.onosproject.yangutils.translator.tojava.JavaQualifiedTypeInfo;
+
+import static org.onosproject.yangutils.translator.tojava.utils.JavaIdentifierSyntax.getCapitalCase;
+import static org.onosproject.yangutils.translator.tojava.utils.TempJavaCodeFragmentFilesUtils.getTempJavaFragement;
+
+/**
+ * Represent the extends list for generated java classes. It holds the class details which needs
+ * to be extended by the generated java code.
+ */
+public class JavaExtendsListHolder {
+
+    /**
+     * Creates an instance of JavaExtendsListHolder.
+     */
+    public JavaExtendsListHolder() {
+        setExtendedClassStore(new HashMap<>());
+        setExtendsList(new ArrayList<>());
+    }
+
+    private Map<JavaQualifiedTypeInfo, Boolean> extendedClassStore;
+    private List<JavaQualifiedTypeInfo> extendsList;
+
+    /**
+     * Returns extends list.
+     *
+     * @return extends list
+     */
+    public Map<JavaQualifiedTypeInfo, Boolean> getExtendedClassStore() {
+        return extendedClassStore;
+    }
+
+    /**
+     * Sets extends list.
+     *
+     * @param extendedClass map of classes need to be extended
+     */
+    private void setExtendedClassStore(Map<JavaQualifiedTypeInfo, Boolean> extendedClass) {
+        this.extendedClassStore = extendedClass;
+    }
+
+    /**
+     * Adds to the extends list.
+     *
+     * @param info java file info
+     * @param node YANG node
+     */
+    public void addToExtendsList(JavaQualifiedTypeInfo info, YangNode node) {
+        JavaFileInfo fileInfo = ((JavaFileInfoContainer) node).getJavaFileInfo();
+
+        JavaImportData importData = getTempJavaFragement(node).getJavaImportData();
+        boolean qualified = importData.addImportInfo(info,
+                getCapitalCase(fileInfo.getJavaName()), fileInfo.getPackage());
+
+            /*true means import should be added*/
+        getExtendedClassStore().put(info, qualified);
+
+        addToExtendsList(info);
+    }
+
+    /**
+     * Returns extends list.
+     *
+     * @return the extendsList
+     */
+    public List<JavaQualifiedTypeInfo> getExtendsList() {
+        return extendsList;
+    }
+
+    /**
+     * Sets extends info list.
+     *
+     * @param classInfoList the extends List to set
+     */
+    private void setExtendsList(List<JavaQualifiedTypeInfo> classInfoList) {
+        this.extendsList = classInfoList;
+    }
+
+    /**
+     * Adds extends info to list.
+     *
+     * @param classInfo class info
+     */
+    private void addToExtendsList(JavaQualifiedTypeInfo classInfo) {
+        getExtendsList().add(classInfo);
+    }
+
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/utils/JavaFileGenerator.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/utils/JavaFileGenerator.java
new file mode 100644
index 0000000..c082d26
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/utils/JavaFileGenerator.java
@@ -0,0 +1,915 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.translator.tojava.utils;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.List;
+
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.translator.tojava.JavaFileInfo;
+import org.onosproject.yangutils.translator.tojava.JavaFileInfoContainer;
+import org.onosproject.yangutils.translator.tojava.TempJavaCodeFragmentFiles;
+import org.onosproject.yangutils.translator.tojava.TempJavaCodeFragmentFilesContainer;
+import org.onosproject.yangutils.translator.tojava.TempJavaEnumerationFragmentFiles;
+import org.onosproject.yangutils.translator.tojava.TempJavaServiceFragmentFiles;
+import org.onosproject.yangutils.translator.tojava.javamodel.JavaCodeGeneratorInfo;
+
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.BUILDER_CLASS_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.BUILDER_INTERFACE_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.GENERATE_ENUM_CLASS;
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.GENERATE_EVENT_CLASS;
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.GENERATE_EVENT_LISTENER_INTERFACE;
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.GENERATE_EVENT_SUBJECT_CLASS;
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.GENERATE_SERVICE_AND_MANAGER;
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.GENERATE_TYPEDEF_CLASS;
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.GENERATE_UNION_CLASS;
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.IMPL_CLASS_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.INTERFACE_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedTempFileType.ATTRIBUTES_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedTempFileType.CONSTRUCTOR_FOR_TYPE_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedTempFileType.CONSTRUCTOR_IMPL_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedTempFileType.ENUM_IMPL_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedTempFileType.EQUALS_IMPL_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedTempFileType.EVENT_ENUM_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedTempFileType.EVENT_METHOD_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedTempFileType.EVENT_SUBJECT_ATTRIBUTE_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedTempFileType.EVENT_SUBJECT_GETTER_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedTempFileType.EVENT_SUBJECT_SETTER_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedTempFileType.FROM_STRING_IMPL_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedTempFileType.GETTER_FOR_CLASS_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedTempFileType.GETTER_FOR_INTERFACE_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedTempFileType.HASH_CODE_IMPL_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedTempFileType.OF_STRING_IMPL_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedTempFileType.RPC_IMPL_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedTempFileType.RPC_INTERFACE_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedTempFileType.SETTER_FOR_CLASS_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedTempFileType.SETTER_FOR_INTERFACE_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedTempFileType.TO_STRING_IMPL_MASK;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaCodeSnippetGen.getAugmentedInfoAttribute;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaFileGeneratorUtils.getDataFromTempFileHandle;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaFileGeneratorUtils.getEnumsValueAttribute;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaFileGeneratorUtils.initiateJavaFileGeneration;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaIdentifierSyntax.getCapitalCase;
+import static org.onosproject.yangutils.translator.tojava.utils.MethodsGenerator.addActivateMethod;
+import static org.onosproject.yangutils.translator.tojava.utils.MethodsGenerator.addDeActivateMethod;
+import static org.onosproject.yangutils.translator.tojava.utils.MethodsGenerator.getAddAugmentInfoMethodImpl;
+import static org.onosproject.yangutils.translator.tojava.utils.MethodsGenerator.getAugmentInfoListImpl;
+import static org.onosproject.yangutils.translator.tojava.utils.MethodsGenerator.getConstructorStart;
+import static org.onosproject.yangutils.translator.tojava.utils.MethodsGenerator.getEnumsConstrcutor;
+import static org.onosproject.yangutils.translator.tojava.utils.MethodsGenerator.getEnumsOfMethod;
+import static org.onosproject.yangutils.translator.tojava.utils.MethodsGenerator.getEqualsMethodClose;
+import static org.onosproject.yangutils.translator.tojava.utils.MethodsGenerator.getEqualsMethodOpen;
+import static org.onosproject.yangutils.translator.tojava.utils.MethodsGenerator.getFromStringMethodClose;
+import static org.onosproject.yangutils.translator.tojava.utils.MethodsGenerator.getFromStringMethodSignature;
+import static org.onosproject.yangutils.translator.tojava.utils.MethodsGenerator.getGetter;
+import static org.onosproject.yangutils.translator.tojava.utils.MethodsGenerator.getHashCodeMethodClose;
+import static org.onosproject.yangutils.translator.tojava.utils.MethodsGenerator.getHashCodeMethodOpen;
+import static org.onosproject.yangutils.translator.tojava.utils.MethodsGenerator.getOmitNullValueString;
+import static org.onosproject.yangutils.translator.tojava.utils.MethodsGenerator.getRemoveAugmentationImpl;
+import static org.onosproject.yangutils.translator.tojava.utils.MethodsGenerator.getToStringMethodClose;
+import static org.onosproject.yangutils.translator.tojava.utils.MethodsGenerator.getToStringMethodOpen;
+import static org.onosproject.yangutils.translator.tojava.utils.TempJavaCodeFragmentFilesUtils.getEventEnumTypeStart;
+import static org.onosproject.yangutils.translator.tojava.utils.TempJavaCodeFragmentFilesUtils.isAugmentationHolderExtended;
+import static org.onosproject.yangutils.utils.UtilConstants.BUILDER;
+import static org.onosproject.yangutils.utils.UtilConstants.CLOSE_CURLY_BRACKET;
+import static org.onosproject.yangutils.utils.UtilConstants.COMMA;
+import static org.onosproject.yangutils.utils.UtilConstants.EMPTY_STRING;
+import static org.onosproject.yangutils.utils.UtilConstants.EVENT_LISTENER_STRING;
+import static org.onosproject.yangutils.utils.UtilConstants.EVENT_STRING;
+import static org.onosproject.yangutils.utils.UtilConstants.EVENT_SUBJECT_NAME_SUFFIX;
+import static org.onosproject.yangutils.utils.UtilConstants.FOUR_SPACE_INDENTATION;
+import static org.onosproject.yangutils.utils.UtilConstants.IMPL;
+import static org.onosproject.yangutils.utils.UtilConstants.INT;
+import static org.onosproject.yangutils.utils.UtilConstants.LOGGER_STATEMENT;
+import static org.onosproject.yangutils.utils.UtilConstants.MANAGER;
+import static org.onosproject.yangutils.utils.UtilConstants.NEW_LINE;
+import static org.onosproject.yangutils.utils.UtilConstants.PRIVATE;
+import static org.onosproject.yangutils.utils.UtilConstants.PUBLIC;
+import static org.onosproject.yangutils.utils.UtilConstants.SEMI_COLAN;
+import static org.onosproject.yangutils.utils.UtilConstants.SERVICE_METHOD_STRING;
+import static org.onosproject.yangutils.utils.io.impl.JavaDocGen.getJavaDoc;
+import static org.onosproject.yangutils.utils.io.impl.JavaDocGen.JavaDocType.GETTER_METHOD;
+import static org.onosproject.yangutils.utils.io.impl.JavaDocGen.JavaDocType.TYPE_CONSTRUCTOR;
+import static org.onosproject.yangutils.utils.io.impl.YangIoUtils.insertDataIntoJavaFile;
+import static org.onosproject.yangutils.utils.io.impl.YangIoUtils.trimAtLast;
+import static org.onosproject.yangutils.utils.io.impl.YangIoUtils.validateLineLength;
+
+/**
+ * Representation of java file generator.
+ */
+public final class JavaFileGenerator {
+
+    private JavaFileGenerator() {
+    }
+
+    /**
+     * Returns generated interface file for current node.
+     *
+     * @param file file
+     * @param imports imports for the file
+     * @param curNode current YANG node
+     * @param isAttrPresent if any attribute is present or not
+     * @return interface file
+     * @throws IOException when fails to write in file
+     */
+    public static File generateInterfaceFile(File file, List<String> imports, YangNode curNode,
+            boolean isAttrPresent)
+            throws IOException {
+
+        JavaFileInfo javaFileInfo = ((JavaFileInfoContainer) curNode).getJavaFileInfo();
+
+        String className = getCapitalCase(javaFileInfo.getJavaName());
+
+        initiateJavaFileGeneration(file, INTERFACE_MASK, imports, curNode, className);
+
+        if (isAttrPresent) {
+            /**
+             * Add getter methods to interface file.
+             */
+            try {
+                /**
+                 * Getter methods.
+                 */
+                insertDataIntoJavaFile(file, getDataFromTempFileHandle(GETTER_FOR_INTERFACE_MASK,
+                        ((TempJavaCodeFragmentFilesContainer) curNode).getTempJavaCodeFragmentFiles()
+                                .getBeanTempFiles()));
+            } catch (IOException e) {
+                throw new IOException("No data found in temporary java code fragment files for " + className
+                        + " while interface file generation");
+            }
+        }
+        return validateLineLength(file);
+    }
+
+    /**
+     * Returns generated builder interface file for current node.
+     *
+     * @param file file
+     * @param curNode current YANG node
+     * @param isAttrPresent if any attribute is present or not
+     * @return builder interface file
+     * @throws IOException when fails to write in file
+     */
+    public static File generateBuilderInterfaceFile(File file, YangNode curNode, boolean isAttrPresent)
+            throws IOException {
+
+        JavaFileInfo javaFileInfo = ((JavaFileInfoContainer) curNode).getJavaFileInfo();
+        YangPluginConfig pluginConfig = javaFileInfo.getPluginConfig();
+
+        String className = getCapitalCase(javaFileInfo.getJavaName());
+        String path = javaFileInfo.getBaseCodeGenPath() + javaFileInfo.getPackageFilePath();
+
+        initiateJavaFileGeneration(file, className, BUILDER_INTERFACE_MASK, null, path, pluginConfig);
+        List<String> methods = new ArrayList<>();
+        if (isAttrPresent) {
+            try {
+                /**
+                 * Getter methods.
+                 */
+                methods.add(FOUR_SPACE_INDENTATION + getDataFromTempFileHandle(GETTER_FOR_INTERFACE_MASK,
+                        ((TempJavaCodeFragmentFilesContainer) curNode).getTempJavaCodeFragmentFiles()
+                                .getBeanTempFiles()));
+                /**
+                 * Setter methods.
+                 */
+                methods.add(NEW_LINE);
+                methods.add(FOUR_SPACE_INDENTATION + getDataFromTempFileHandle(SETTER_FOR_INTERFACE_MASK,
+                        ((TempJavaCodeFragmentFilesContainer) curNode).getTempJavaCodeFragmentFiles()
+                                .getBeanTempFiles()));
+            } catch (IOException e) {
+                throw new IOException("No data found in temporary java code fragment files for " + className
+                        + " while builder interface file generation");
+            }
+        }
+        /**
+         * Add build method to builder interface file.
+         */
+        methods.add(
+                ((TempJavaCodeFragmentFilesContainer) curNode).getTempJavaCodeFragmentFiles()
+                        .addBuildMethodForInterface(pluginConfig));
+
+        /**
+         * Add getters and setters in builder interface.
+         */
+        for (String method : methods) {
+            insertDataIntoJavaFile(file, method);
+        }
+
+        insertDataIntoJavaFile(file, CLOSE_CURLY_BRACKET + NEW_LINE);
+        return validateLineLength(file);
+    }
+
+    /**
+     * Returns generated builder class file for current node.
+     *
+     * @param file file
+     * @param imports imports for the file
+     * @param curNode current YANG node
+     * @param isAttrPresent if any attribute is present or not
+     * @return builder class file
+     * @throws IOException when fails to write in file
+     */
+    public static File generateBuilderClassFile(File file, List<String> imports, YangNode curNode,
+            boolean isAttrPresent)
+            throws IOException {
+
+        JavaFileInfo javaFileInfo = ((JavaFileInfoContainer) curNode).getJavaFileInfo();
+        YangPluginConfig pluginConfig = javaFileInfo.getPluginConfig();
+
+        String className = getCapitalCase(javaFileInfo.getJavaName());
+        String path = javaFileInfo.getBaseCodeGenPath() + javaFileInfo.getPackageFilePath();
+
+        initiateJavaFileGeneration(file, className, BUILDER_CLASS_MASK, imports, path, pluginConfig);
+
+        List<String> methods = new ArrayList<>();
+
+        if (isAttrPresent) {
+            /**
+             * Add attribute strings.
+             */
+            try {
+                insertDataIntoJavaFile(file,
+                        NEW_LINE + FOUR_SPACE_INDENTATION + getDataFromTempFileHandle(ATTRIBUTES_MASK,
+                                ((TempJavaCodeFragmentFilesContainer) curNode).getTempJavaCodeFragmentFiles()
+                                        .getBeanTempFiles()));
+            } catch (IOException e) {
+                throw new IOException("No data found in temporary java code fragment files for " + className
+                        + " while builder class file generation");
+            }
+
+            try {
+                /**
+                 * Getter methods.
+                 */
+                methods.add(getDataFromTempFileHandle(GETTER_FOR_CLASS_MASK,
+                        ((TempJavaCodeFragmentFilesContainer) curNode).getTempJavaCodeFragmentFiles()
+                                .getBeanTempFiles()));
+                /**
+                 * Setter methods.
+                 */
+                methods.add(getDataFromTempFileHandle(SETTER_FOR_CLASS_MASK,
+                        ((TempJavaCodeFragmentFilesContainer) curNode).getTempJavaCodeFragmentFiles()
+                                .getBeanTempFiles()) +
+                        NEW_LINE);
+            } catch (IOException e) {
+                throw new IOException("No data found in temporary java code fragment files for " + className
+                        + " while builder class file generation");
+            }
+        } else {
+            insertDataIntoJavaFile(file, NEW_LINE);
+        }
+        /**
+         * Add default constructor and build method impl.
+         */
+        methods.add(((TempJavaCodeFragmentFilesContainer) curNode).getTempJavaCodeFragmentFiles()
+                .addBuildMethodImpl());
+        methods.add(((TempJavaCodeFragmentFilesContainer) curNode).getTempJavaCodeFragmentFiles()
+                .addDefaultConstructor(PUBLIC, BUILDER, pluginConfig));
+
+        /**
+         * Add methods in builder class.
+         */
+        for (String method : methods) {
+            insertDataIntoJavaFile(file, method);
+        }
+        return validateLineLength(file);
+    }
+
+    /**
+     * Returns generated manager class file for current node.
+     *
+     * @param file file
+     * @param imports imports for the file
+     * @param curNode current YANG node
+     * @param isAttrPresent if any attribute is present or not
+     * @return builder class file
+     * @throws IOException when fails to write in file
+     */
+    public static File generateManagerClassFile(File file, List<String> imports, YangNode curNode,
+            boolean isAttrPresent)
+            throws IOException {
+
+        JavaFileInfo javaFileInfo = ((JavaFileInfoContainer) curNode).getJavaFileInfo();
+
+        String className = getCapitalCase(javaFileInfo.getJavaName()) + MANAGER;
+
+        initiateJavaFileGeneration(file, GENERATE_SERVICE_AND_MANAGER, imports, curNode, className);
+
+        List<String> methods = new ArrayList<>();
+
+        insertDataIntoJavaFile(file, LOGGER_STATEMENT);
+        methods.add(addActivateMethod());
+        methods.add(addDeActivateMethod());
+
+        try {
+            if (isAttrPresent) {
+                /**
+                 * Getter methods.
+                 */
+                methods.add(
+                        getDataFromTempFileHandle(GETTER_FOR_CLASS_MASK,
+                                ((TempJavaCodeFragmentFilesContainer) curNode)
+                                        .getTempJavaCodeFragmentFiles().getServiceTempFiles()));
+                /**
+                 * Setter methods.
+                 */
+                methods.add(
+                        getDataFromTempFileHandle(SETTER_FOR_CLASS_MASK,
+                                ((TempJavaCodeFragmentFilesContainer) curNode)
+                                        .getTempJavaCodeFragmentFiles().getServiceTempFiles())
+                                + NEW_LINE);
+
+            }
+            if (((JavaCodeGeneratorInfo) curNode).getTempJavaCodeFragmentFiles().getServiceTempFiles() != null) {
+                JavaCodeGeneratorInfo javaGeninfo = (JavaCodeGeneratorInfo) curNode;
+                /**
+                 * Rpc methods
+                 */
+                methods.add(getDataFromTempFileHandle(RPC_IMPL_MASK,
+                        javaGeninfo.getTempJavaCodeFragmentFiles().getServiceTempFiles()));
+            }
+            insertDataIntoJavaFile(file, NEW_LINE);
+
+        } catch (IOException e) {
+            throw new IOException("No data found in temporary java code fragment files for " + className
+                    + " while manager class file generation");
+        }
+
+        /**
+         * Add methods in builder class.
+         */
+        for (String method : methods) {
+            insertDataIntoJavaFile(file, method);
+        }
+        return validateLineLength(file);
+    }
+
+    /**
+     * Returns generated impl class file for current node.
+     *
+     * @param file file
+     * @param curNode current YANG node
+     * @param isAttrPresent if any attribute is present or not
+     * @return impl class file
+     * @throws IOException when fails to write in file
+     */
+    public static File generateImplClassFile(File file, YangNode curNode, boolean isAttrPresent)
+            throws IOException {
+
+        JavaFileInfo javaFileInfo = ((JavaFileInfoContainer) curNode).getJavaFileInfo();
+        YangPluginConfig pluginConfig = javaFileInfo.getPluginConfig();
+
+        String className = getCapitalCase(javaFileInfo.getJavaName());
+        String path = javaFileInfo.getBaseCodeGenPath() + javaFileInfo.getPackageFilePath();
+
+        initiateJavaFileGeneration(file, className, IMPL_CLASS_MASK, null, path, pluginConfig);
+
+        List<String> methods = new ArrayList<>();
+
+        TempJavaCodeFragmentFiles javaCodeFragmentFiles = ((TempJavaCodeFragmentFilesContainer) curNode)
+                .getTempJavaCodeFragmentFiles();
+        boolean isAugmentationHolderExtended = isAugmentationHolderExtended(
+                javaCodeFragmentFiles.getBeanTempFiles().getJavaExtendsListHolder().getExtendsList());
+        /**
+         * Add attribute for augmented info's list.
+         */
+        if (isAugmentationHolderExtended) {
+            insertDataIntoJavaFile(file, getAugmentedInfoAttribute());
+        }
+        if (isAttrPresent) {
+            /**
+             * Add attribute strings.
+             */
+            try {
+                insertDataIntoJavaFile(file,
+                        NEW_LINE + FOUR_SPACE_INDENTATION + getDataFromTempFileHandle(ATTRIBUTES_MASK,
+                                ((TempJavaCodeFragmentFilesContainer) curNode).getTempJavaCodeFragmentFiles()
+                                        .getBeanTempFiles()));
+            } catch (IOException e) {
+                throw new IOException("No data found in temporary java code fragment files for " + className
+                        + " while impl class file generation");
+            }
+
+            insertDataIntoJavaFile(file, NEW_LINE);
+            try {
+                /**
+                 * Getter methods.
+                 */
+                methods.add(getDataFromTempFileHandle(GETTER_FOR_CLASS_MASK,
+                        ((TempJavaCodeFragmentFilesContainer) curNode).getTempJavaCodeFragmentFiles()
+                                .getBeanTempFiles()));
+
+                /**
+                 * Hash code method.
+                 */
+                methods.add(getHashCodeMethodClose(getHashCodeMethodOpen() +
+                        getDataFromTempFileHandle(HASH_CODE_IMPL_MASK,
+                                ((TempJavaCodeFragmentFilesContainer) curNode).getTempJavaCodeFragmentFiles()
+                                        .getBeanTempFiles()).replace(NEW_LINE, EMPTY_STRING)));
+                /**
+                 * Equals method.
+                 */
+                methods.add(getEqualsMethodClose(
+                        getEqualsMethodOpen(className + IMPL) + getDataFromTempFileHandle(EQUALS_IMPL_MASK,
+                                ((TempJavaCodeFragmentFilesContainer) curNode).getTempJavaCodeFragmentFiles()
+                                        .getBeanTempFiles())));
+                /**
+                 * To string method.
+                 */
+                methods.add(getToStringMethodOpen() + getDataFromTempFileHandle(TO_STRING_IMPL_MASK,
+                        ((TempJavaCodeFragmentFilesContainer) curNode).getTempJavaCodeFragmentFiles()
+                                .getBeanTempFiles())
+                        + getToStringMethodClose());
+
+            } catch (IOException e) {
+                throw new IOException("No data found in temporary java code fragment files for " + className
+                        + " while impl class file generation");
+            }
+        } else {
+            insertDataIntoJavaFile(file, NEW_LINE);
+        }
+        try {
+
+            /**
+             * Constructor.
+             */
+            String constructor =
+                    getConstructorStart(className, pluginConfig) + getDataFromTempFileHandle(CONSTRUCTOR_IMPL_MASK,
+                            ((TempJavaCodeFragmentFilesContainer) curNode).getTempJavaCodeFragmentFiles()
+                                    .getBeanTempFiles());
+
+            methods.add(constructor + FOUR_SPACE_INDENTATION + CLOSE_CURLY_BRACKET);
+        } catch (IOException e) {
+            throw new IOException("No data found in temporary java code fragment files for " + className
+                    + " while impl class file generation");
+        }
+
+        /**
+         * Add method for augment info's list.
+         */
+        if (isAugmentationHolderExtended) {
+            methods.add(getAddAugmentInfoMethodImpl());
+            methods.add(getAugmentInfoListImpl());
+            methods.add(getRemoveAugmentationImpl());
+        }
+
+        /**
+         * Add methods in impl class.
+         */
+        for (String method : methods) {
+            insertDataIntoJavaFile(file, FOUR_SPACE_INDENTATION + method + NEW_LINE);
+        }
+        insertDataIntoJavaFile(file, CLOSE_CURLY_BRACKET + NEW_LINE);
+
+        return validateLineLength(file);
+    }
+
+    /**
+     * Generates class file for type def.
+     *
+     * @param file generated file
+     * @param curNode current YANG node
+     * @param imports imports for file
+     * @return type def class file
+     * @throws IOException when fails to generate class file
+     */
+    public static File generateTypeDefClassFile(File file, YangNode curNode, List<String> imports)
+            throws IOException {
+
+        JavaFileInfo javaFileInfo = ((JavaFileInfoContainer) curNode).getJavaFileInfo();
+        YangPluginConfig pluginConfig = javaFileInfo.getPluginConfig();
+
+        String className = getCapitalCase(javaFileInfo.getJavaName());
+        String path = javaFileInfo.getBaseCodeGenPath() + javaFileInfo.getPackageFilePath();
+
+        initiateJavaFileGeneration(file, className, GENERATE_TYPEDEF_CLASS, imports, path, pluginConfig);
+
+        List<String> methods = new ArrayList<>();
+
+        /**
+         * Add attribute strings.
+         */
+        try {
+            insertDataIntoJavaFile(file,
+                    NEW_LINE + FOUR_SPACE_INDENTATION + getDataFromTempFileHandle(ATTRIBUTES_MASK,
+                            ((TempJavaCodeFragmentFilesContainer) curNode).getTempJavaCodeFragmentFiles()
+                                    .getTypeTempFiles()));
+        } catch (IOException e) {
+            throw new IOException("No data found in temporary java code fragment files for " + className
+                    + " while type def class file generation");
+        }
+
+        /**
+         * Default constructor.
+         */
+        methods.add(((TempJavaCodeFragmentFilesContainer) curNode).getTempJavaCodeFragmentFiles()
+                .addDefaultConstructor(PRIVATE, EMPTY_STRING, pluginConfig));
+
+        try {
+
+            /**
+             * Type constructor.
+             */
+            methods.add(getDataFromTempFileHandle(CONSTRUCTOR_FOR_TYPE_MASK,
+                    ((TempJavaCodeFragmentFilesContainer) curNode).getTempJavaCodeFragmentFiles().getTypeTempFiles()));
+
+            /**
+             * Of method.
+             */
+            methods.add(getDataFromTempFileHandle(OF_STRING_IMPL_MASK,
+                    ((TempJavaCodeFragmentFilesContainer) curNode).getTempJavaCodeFragmentFiles().getTypeTempFiles()));
+
+            /**
+             * Getter method.
+             */
+            methods.add(getDataFromTempFileHandle(GETTER_FOR_CLASS_MASK,
+                    ((TempJavaCodeFragmentFilesContainer) curNode).getTempJavaCodeFragmentFiles().getTypeTempFiles()));
+
+            /**
+             * Hash code method.
+             */
+            methods.add(getHashCodeMethodClose(getHashCodeMethodOpen() +
+                    getDataFromTempFileHandle(HASH_CODE_IMPL_MASK,
+                            ((TempJavaCodeFragmentFilesContainer) curNode).getTempJavaCodeFragmentFiles()
+                                    .getTypeTempFiles())
+                                            .replace(NEW_LINE, EMPTY_STRING)));
+
+            /**
+             * Equals method.
+             */
+            methods.add(getEqualsMethodClose(getEqualsMethodOpen(className + EMPTY_STRING)
+                    + getDataFromTempFileHandle(EQUALS_IMPL_MASK,
+                    ((TempJavaCodeFragmentFilesContainer) curNode).getTempJavaCodeFragmentFiles().getTypeTempFiles())));
+
+            /**
+             * To string method.
+             */
+            methods.add(getToStringMethodOpen() + getDataFromTempFileHandle(TO_STRING_IMPL_MASK,
+                    ((TempJavaCodeFragmentFilesContainer) curNode).getTempJavaCodeFragmentFiles().getTypeTempFiles())
+                    + getToStringMethodClose());
+
+            JavaCodeGeneratorInfo javaGeninfo = (JavaCodeGeneratorInfo) curNode;
+            /**
+             * From string method.
+             */
+            methods.add(getFromStringMethodSignature(className, pluginConfig)
+                    + getDataFromTempFileHandle(FROM_STRING_IMPL_MASK, javaGeninfo.getTempJavaCodeFragmentFiles()
+                    .getTypeTempFiles()) + getFromStringMethodClose());
+
+        } catch (IOException e) {
+            throw new IOException("No data found in temporary java code fragment files for " + className
+                    + " while type def class file generation");
+        }
+
+        for (String method : methods) {
+            insertDataIntoJavaFile(file, method);
+        }
+        insertDataIntoJavaFile(file, CLOSE_CURLY_BRACKET + NEW_LINE);
+
+        return validateLineLength(file);
+    }
+
+    /**
+     * Generates class file for union type.
+     *
+     * @param file generated file
+     * @param curNode current YANG node
+     * @param imports imports for file
+     * @return type def class file
+     * @throws IOException when fails to generate class file
+     */
+    public static File generateUnionClassFile(File file, YangNode curNode, List<String> imports)
+            throws IOException {
+
+        JavaFileInfo javaFileInfo = ((JavaFileInfoContainer) curNode).getJavaFileInfo();
+        YangPluginConfig pluginConfig = javaFileInfo.getPluginConfig();
+
+        String className = getCapitalCase(javaFileInfo.getJavaName());
+        String path = javaFileInfo.getBaseCodeGenPath() + javaFileInfo.getPackageFilePath();
+
+        initiateJavaFileGeneration(file, className, GENERATE_UNION_CLASS, imports, path, pluginConfig);
+
+        List<String> methods = new ArrayList<>();
+
+        /**
+         * Add attribute strings.
+         */
+        try {
+            insertDataIntoJavaFile(file,
+                    NEW_LINE + FOUR_SPACE_INDENTATION + getDataFromTempFileHandle(ATTRIBUTES_MASK,
+                            ((TempJavaCodeFragmentFilesContainer) curNode).getTempJavaCodeFragmentFiles()
+                                    .getTypeTempFiles()));
+        } catch (IOException e) {
+            throw new IOException("No data found in temporary java code fragment files for " + className
+                    + " while union class file generation");
+        }
+
+        /**
+         * Default constructor.
+         */
+        methods.add(((TempJavaCodeFragmentFilesContainer) curNode).getTempJavaCodeFragmentFiles()
+                .addDefaultConstructor(PRIVATE, EMPTY_STRING, pluginConfig));
+
+        try {
+
+            /**
+             * Type constructor.
+             */
+            methods.add(getDataFromTempFileHandle(CONSTRUCTOR_FOR_TYPE_MASK,
+                    ((TempJavaCodeFragmentFilesContainer) curNode).getTempJavaCodeFragmentFiles().getTypeTempFiles()));
+
+            /**
+             * Of string method.
+             */
+            methods.add(getDataFromTempFileHandle(OF_STRING_IMPL_MASK,
+                    ((TempJavaCodeFragmentFilesContainer) curNode).getTempJavaCodeFragmentFiles().getTypeTempFiles()));
+
+            /**
+             * Getter method.
+             */
+            methods.add(getDataFromTempFileHandle(GETTER_FOR_CLASS_MASK,
+                    ((TempJavaCodeFragmentFilesContainer) curNode).getTempJavaCodeFragmentFiles().getTypeTempFiles()));
+
+            /**
+             * Hash code method.
+             */
+            methods.add(getHashCodeMethodClose(getHashCodeMethodOpen() +
+                    getDataFromTempFileHandle(HASH_CODE_IMPL_MASK,
+                            ((TempJavaCodeFragmentFilesContainer) curNode).getTempJavaCodeFragmentFiles()
+                                    .getTypeTempFiles())
+                                            .replace(NEW_LINE, EMPTY_STRING)));
+
+            /**
+             * Equals method.
+             */
+            methods.add(getEqualsMethodClose(getEqualsMethodOpen(className + EMPTY_STRING)
+                    + getDataFromTempFileHandle(EQUALS_IMPL_MASK,
+                    ((TempJavaCodeFragmentFilesContainer) curNode).getTempJavaCodeFragmentFiles().getTypeTempFiles())));
+
+            /**
+             * To string method.
+             */
+            methods.add(getToStringMethodOpen() + getOmitNullValueString() +
+                    getDataFromTempFileHandle(TO_STRING_IMPL_MASK,
+                            ((TempJavaCodeFragmentFilesContainer) curNode).getTempJavaCodeFragmentFiles()
+                                    .getTypeTempFiles()) + getToStringMethodClose());
+
+            /**
+             * From string method.
+             */
+            methods.add(getFromStringMethodSignature(className, pluginConfig)
+                    + getDataFromTempFileHandle(FROM_STRING_IMPL_MASK,
+                    ((TempJavaCodeFragmentFilesContainer) curNode).getTempJavaCodeFragmentFiles().getTypeTempFiles())
+                    + getFromStringMethodClose());
+
+        } catch (IOException e) {
+            throw new IOException("No data found in temporary java code fragment files for " + className
+                    + " while union class file generation");
+        }
+
+        for (String method : methods) {
+            insertDataIntoJavaFile(file, method);
+        }
+        insertDataIntoJavaFile(file, CLOSE_CURLY_BRACKET + NEW_LINE);
+
+        return validateLineLength(file);
+    }
+
+    /**
+     * Generates class file for type enum.
+     *
+     * @param file generated file
+     * @param curNode current YANG node
+     * @return class file for type enum
+     * @throws IOException when fails to generate class file
+     */
+    public static File generateEnumClassFile(File file, YangNode curNode)
+            throws IOException {
+
+        JavaFileInfo javaFileInfo = ((JavaFileInfoContainer) curNode).getJavaFileInfo();
+        YangPluginConfig pluginConfig = javaFileInfo.getPluginConfig();
+
+        String className = javaFileInfo.getJavaName();
+        String path = javaFileInfo.getBaseCodeGenPath() + javaFileInfo.getPackageFilePath();
+
+        initiateJavaFileGeneration(file, getCapitalCase(className), GENERATE_ENUM_CLASS, null, path, pluginConfig);
+        /**
+         * Add attribute strings.
+         */
+        try {
+            JavaCodeGeneratorInfo javaGeninfo = (JavaCodeGeneratorInfo) curNode;
+            insertDataIntoJavaFile(file,
+                    trimAtLast(trimAtLast(getDataFromTempFileHandle(ENUM_IMPL_MASK, javaGeninfo
+                            .getTempJavaCodeFragmentFiles().getEnumerationTempFiles()), COMMA), NEW_LINE)
+                            + SEMI_COLAN + NEW_LINE);
+        } catch (IOException e) {
+            throw new IOException("No data found in temporary java code fragment files for " + getCapitalCase(className)
+                    + " while enum class file generation");
+        }
+
+        /**
+         * Add an
+         * attribute to get the enum's values.
+         */
+        insertDataIntoJavaFile(file, getEnumsValueAttribute(getCapitalCase(className)));
+
+        /**
+         * Add a constructor for enum.
+         */
+        insertDataIntoJavaFile(file, getJavaDoc(TYPE_CONSTRUCTOR, className, false, pluginConfig)
+                + getEnumsConstrcutor(getCapitalCase(className)) + NEW_LINE);
+
+        TempJavaEnumerationFragmentFiles enumFragFiles =
+                ((TempJavaCodeFragmentFilesContainer) curNode).getTempJavaCodeFragmentFiles()
+                        .getEnumerationTempFiles();
+        insertDataIntoJavaFile(file, getEnumsOfMethod(className,
+                enumFragFiles.getJavaAttributeForEnum(pluginConfig),
+                enumFragFiles.getEnumSetJavaMap(),
+                enumFragFiles.getEnumStringList(), pluginConfig)
+                + NEW_LINE);
+
+        /**
+         * Add a getter method for enum.
+         */
+        insertDataIntoJavaFile(file, getJavaDoc(GETTER_METHOD, className, false, pluginConfig)
+                + getGetter(INT, className, GENERATE_ENUM_CLASS) + NEW_LINE);
+
+        try {
+            insertDataIntoJavaFile(file, getFromStringMethodSignature(getCapitalCase(className), pluginConfig)
+                    + getDataFromTempFileHandle(FROM_STRING_IMPL_MASK,
+                            ((TempJavaCodeFragmentFilesContainer) curNode).getTempJavaCodeFragmentFiles()
+                                    .getEnumerationTempFiles())
+                    + getFromStringMethodClose());
+        } catch (IOException e) {
+            throw new IOException("No data found in temporary java code fragment files for " +
+                    getCapitalCase(className) + " while enum class file generation");
+        }
+
+        insertDataIntoJavaFile(file, CLOSE_CURLY_BRACKET + NEW_LINE);
+
+        return validateLineLength(file);
+    }
+
+    /**
+     * Generates interface file for rpc.
+     *
+     * @param file generated file
+     * @param curNode current YANG node
+     * @param imports imports for file
+     * @param isAttributePresent is attribute present
+     * @return rpc class file
+     * @throws IOException when fails to generate class file
+     */
+    public static File generateServiceInterfaceFile(File file, YangNode curNode, List<String> imports,
+            boolean isAttributePresent)
+            throws IOException {
+
+        JavaFileInfo javaFileInfo = ((JavaFileInfoContainer) curNode).getJavaFileInfo();
+
+        String className = getCapitalCase(javaFileInfo.getJavaName()) + SERVICE_METHOD_STRING;
+        initiateJavaFileGeneration(file, GENERATE_SERVICE_AND_MANAGER, imports, curNode, className);
+
+        List<String> methods = new ArrayList<>();
+
+        try {
+            if (isAttributePresent) {
+
+                /**
+                 * Getter methods.
+                 */
+                methods.add(getDataFromTempFileHandle(GETTER_FOR_INTERFACE_MASK,
+                        ((TempJavaCodeFragmentFilesContainer) curNode).getTempJavaCodeFragmentFiles()
+                                .getServiceTempFiles()));
+                /**
+                 * Setter methods.
+                 */
+                methods.add(getDataFromTempFileHandle(SETTER_FOR_INTERFACE_MASK,
+                        ((TempJavaCodeFragmentFilesContainer) curNode).getTempJavaCodeFragmentFiles()
+                                .getServiceTempFiles()));
+            }
+            if (((JavaCodeGeneratorInfo) curNode).getTempJavaCodeFragmentFiles().getServiceTempFiles() != null) {
+                JavaCodeGeneratorInfo javaGeninfo = (JavaCodeGeneratorInfo) curNode;
+                /**
+                 * Rpc methods
+                 */
+                methods.add(getDataFromTempFileHandle(RPC_INTERFACE_MASK,
+                        javaGeninfo.getTempJavaCodeFragmentFiles().getServiceTempFiles()));
+            }
+        } catch (IOException e) {
+            throw new IOException("No data found in temporary java code fragment files for " + className
+                    + " while rpc class file generation");
+        }
+
+        for (String method : methods) {
+            insertDataIntoJavaFile(file, method);
+        }
+        insertDataIntoJavaFile(file, CLOSE_CURLY_BRACKET + NEW_LINE);
+
+        return validateLineLength(file);
+    }
+
+    /**
+     * Generates event file.
+     *
+     * @param file generated file
+     * @param curNode current YANG node
+     * @param imports imports for file
+     * @throws IOException when fails to generate class file
+     */
+    public static void generateEventFile(File file, YangNode curNode, List<String> imports) throws IOException {
+
+        String className =
+                getCapitalCase(((JavaFileInfoContainer) curNode).getJavaFileInfo().getJavaName())
+                        + EVENT_STRING;
+
+        TempJavaServiceFragmentFiles tempFiles = ((TempJavaCodeFragmentFilesContainer) curNode)
+                .getTempJavaCodeFragmentFiles().getServiceTempFiles();
+
+        initiateJavaFileGeneration(file, GENERATE_EVENT_CLASS, imports, curNode, className);
+        try {
+            insertDataIntoJavaFile(file, NEW_LINE + getEventEnumTypeStart() +
+                    trimAtLast(getDataFromTempFileHandle(EVENT_ENUM_MASK, tempFiles), COMMA)
+                    + FOUR_SPACE_INDENTATION + CLOSE_CURLY_BRACKET + NEW_LINE);
+
+            insertDataIntoJavaFile(file, getDataFromTempFileHandle(EVENT_METHOD_MASK, tempFiles));
+
+        } catch (IOException e) {
+            throw new IOException("No data found in temporary java code fragment files for " + className
+                    + " while event class file generation");
+        }
+
+        insertDataIntoJavaFile(file, CLOSE_CURLY_BRACKET + NEW_LINE);
+        validateLineLength(file);
+    }
+
+    /**
+     * Generates event listener file.
+     *
+     * @param file generated file
+     * @param curNode current YANG node
+     * @param imports imports for file
+     * @throws IOException when fails to generate class file
+     */
+    public static void generateEventListenerFile(File file, YangNode curNode, List<String> imports)
+            throws IOException {
+
+        String className =
+                getCapitalCase(((JavaFileInfoContainer) curNode).getJavaFileInfo().getJavaName())
+                        + EVENT_LISTENER_STRING;
+
+        initiateJavaFileGeneration(file, GENERATE_EVENT_LISTENER_INTERFACE, imports, curNode, className);
+        insertDataIntoJavaFile(file, CLOSE_CURLY_BRACKET + NEW_LINE);
+        validateLineLength(file);
+    }
+
+    /**
+     * Generates event subject's file.
+     *
+     * @param file file handle
+     * @param curNode current YANG node
+     * @throws IOException when fails to do IO exceptions
+     */
+    public static void generateEventSubjectFile(File file, YangNode curNode)
+            throws IOException {
+
+        String className = getCapitalCase(((JavaFileInfoContainer) curNode).getJavaFileInfo().getJavaName())
+                + EVENT_SUBJECT_NAME_SUFFIX;
+
+        initiateJavaFileGeneration(file, GENERATE_EVENT_SUBJECT_CLASS, null, curNode, className);
+
+        TempJavaServiceFragmentFiles tempFiles = ((TempJavaCodeFragmentFilesContainer) curNode)
+                .getTempJavaCodeFragmentFiles().getServiceTempFiles();
+
+        insertDataIntoJavaFile(file, NEW_LINE);
+        try {
+            insertDataIntoJavaFile(file, getDataFromTempFileHandle(EVENT_SUBJECT_ATTRIBUTE_MASK, tempFiles));
+
+            insertDataIntoJavaFile(file, getDataFromTempFileHandle(EVENT_SUBJECT_GETTER_MASK, tempFiles));
+
+            insertDataIntoJavaFile(file, getDataFromTempFileHandle(EVENT_SUBJECT_SETTER_MASK, tempFiles));
+
+        } catch (IOException e) {
+            throw new IOException("No data found in temporary java code fragment files for " + className
+                    + " while event class file generation");
+        }
+
+        insertDataIntoJavaFile(file, CLOSE_CURLY_BRACKET + NEW_LINE);
+        validateLineLength(file);
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/utils/JavaFileGeneratorUtils.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/utils/JavaFileGeneratorUtils.java
new file mode 100644
index 0000000..c940791
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/utils/JavaFileGeneratorUtils.java
@@ -0,0 +1,513 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.translator.tojava.utils;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.List;
+
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.translator.exception.TranslatorException;
+import org.onosproject.yangutils.translator.tojava.JavaFileInfo;
+import org.onosproject.yangutils.translator.tojava.JavaFileInfoContainer;
+import org.onosproject.yangutils.translator.tojava.TempJavaBeanFragmentFiles;
+import org.onosproject.yangutils.translator.tojava.TempJavaEnumerationFragmentFiles;
+import org.onosproject.yangutils.translator.tojava.TempJavaFragmentFiles;
+import org.onosproject.yangutils.translator.tojava.TempJavaServiceFragmentFiles;
+import org.onosproject.yangutils.translator.tojava.TempJavaTypeFragmentFiles;
+import org.onosproject.yangutils.utils.io.impl.CopyrightHeader;
+import org.onosproject.yangutils.utils.io.impl.JavaDocGen.JavaDocType;
+
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.BUILDER_CLASS_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.BUILDER_INTERFACE_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.GENERATE_ENUM_CLASS;
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.GENERATE_EVENT_CLASS;
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.GENERATE_EVENT_LISTENER_INTERFACE;
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.GENERATE_EVENT_SUBJECT_CLASS;
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.GENERATE_SERVICE_AND_MANAGER;
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.GENERATE_TYPEDEF_CLASS;
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.GENERATE_UNION_CLASS;
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.IMPL_CLASS_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.INTERFACE_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedTempFileType.ATTRIBUTES_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedTempFileType.CONSTRUCTOR_FOR_TYPE_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedTempFileType.CONSTRUCTOR_IMPL_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedTempFileType.ENUM_IMPL_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedTempFileType.EQUALS_IMPL_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedTempFileType.EVENT_ENUM_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedTempFileType.EVENT_METHOD_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedTempFileType.EVENT_SUBJECT_ATTRIBUTE_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedTempFileType.EVENT_SUBJECT_GETTER_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedTempFileType.EVENT_SUBJECT_SETTER_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedTempFileType.FROM_STRING_IMPL_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedTempFileType.GETTER_FOR_CLASS_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedTempFileType.GETTER_FOR_INTERFACE_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedTempFileType.HASH_CODE_IMPL_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedTempFileType.OF_STRING_IMPL_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedTempFileType.RPC_IMPL_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedTempFileType.RPC_INTERFACE_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedTempFileType.SETTER_FOR_CLASS_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedTempFileType.SETTER_FOR_INTERFACE_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedTempFileType.TO_STRING_IMPL_MASK;
+import static org.onosproject.yangutils.translator.tojava.utils.ClassDefinitionGenerator.generateClassDefinition;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaIdentifierSyntax.getJavaPackageFromPackagePath;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaIdentifierSyntax.getSmallCase;
+import static org.onosproject.yangutils.utils.UtilConstants.CLOSE_PARENTHESIS;
+import static org.onosproject.yangutils.utils.UtilConstants.COMPONENT_ANNOTATION;
+import static org.onosproject.yangutils.utils.UtilConstants.EQUAL;
+import static org.onosproject.yangutils.utils.UtilConstants.FOUR_SPACE_INDENTATION;
+import static org.onosproject.yangutils.utils.UtilConstants.IMMEDIATE;
+import static org.onosproject.yangutils.utils.UtilConstants.INT;
+import static org.onosproject.yangutils.utils.UtilConstants.NEW_LINE;
+import static org.onosproject.yangutils.utils.UtilConstants.OPEN_PARENTHESIS;
+import static org.onosproject.yangutils.utils.UtilConstants.PACKAGE;
+import static org.onosproject.yangutils.utils.UtilConstants.PERIOD;
+import static org.onosproject.yangutils.utils.UtilConstants.PRIVATE;
+import static org.onosproject.yangutils.utils.UtilConstants.REGEX_FOR_ANY_STRING_ENDING_WITH_SERVICE;
+import static org.onosproject.yangutils.utils.UtilConstants.SEMI_COLAN;
+import static org.onosproject.yangutils.utils.UtilConstants.SERVICE_ANNOTATION;
+import static org.onosproject.yangutils.utils.UtilConstants.SLASH;
+import static org.onosproject.yangutils.utils.UtilConstants.SPACE;
+import static org.onosproject.yangutils.utils.UtilConstants.TRUE;
+import static org.onosproject.yangutils.utils.io.impl.JavaDocGen.JavaDocType.BUILDER_CLASS;
+import static org.onosproject.yangutils.utils.io.impl.JavaDocGen.JavaDocType.BUILDER_INTERFACE;
+import static org.onosproject.yangutils.utils.io.impl.JavaDocGen.JavaDocType.ENUM_CLASS;
+import static org.onosproject.yangutils.utils.io.impl.JavaDocGen.JavaDocType.EVENT;
+import static org.onosproject.yangutils.utils.io.impl.JavaDocGen.JavaDocType.EVENT_LISTENER;
+import static org.onosproject.yangutils.utils.io.impl.JavaDocGen.JavaDocType.EVENT_SUBJECT_CLASS;
+import static org.onosproject.yangutils.utils.io.impl.JavaDocGen.JavaDocType.IMPL_CLASS;
+import static org.onosproject.yangutils.utils.io.impl.JavaDocGen.JavaDocType.INTERFACE;
+import static org.onosproject.yangutils.utils.io.impl.JavaDocGen.JavaDocType.RPC_INTERFACE;
+import static org.onosproject.yangutils.utils.io.impl.JavaDocGen.JavaDocType.RPC_MANAGER;
+import static org.onosproject.yangutils.utils.io.impl.JavaDocGen.getJavaDoc;
+import static org.onosproject.yangutils.utils.io.impl.YangIoUtils.insertDataIntoJavaFile;
+import static org.onosproject.yangutils.utils.io.impl.YangIoUtils.parsePkg;
+
+/**
+ * Represents utilities for java file generator.
+ */
+public final class JavaFileGeneratorUtils {
+
+    /**
+     * Creates an instance of java file generator util.
+     */
+    private JavaFileGeneratorUtils() {
+    }
+
+    /**
+     * Returns a file object for generated file.
+     *
+     * @param fileName  file name
+     * @param filePath  file package path
+     * @param extension file extension
+     * @param handle    cached file handle
+     * @return file object
+     */
+    public static File getFileObject(String filePath, String fileName, String extension, JavaFileInfo handle) {
+
+        return new File(handle.getBaseCodeGenPath() + filePath + SLASH + fileName + extension);
+    }
+
+    /**
+     * Returns data stored in temporary files.
+     *
+     * @param generatedTempFiles    temporary file types
+     * @param tempJavaFragmentFiles temp java fragment files
+     * @return data stored in temporary files
+     * @throws IOException when failed to get the data from temporary file handle
+     */
+    public static String getDataFromTempFileHandle(int generatedTempFiles,
+            TempJavaFragmentFiles tempJavaFragmentFiles)
+            throws IOException {
+
+        TempJavaTypeFragmentFiles typeFragmentFiles = null;
+
+        if (tempJavaFragmentFiles instanceof TempJavaTypeFragmentFiles) {
+            typeFragmentFiles = (TempJavaTypeFragmentFiles) tempJavaFragmentFiles;
+        }
+
+        TempJavaBeanFragmentFiles beanFragmentFiles = null;
+
+        if (tempJavaFragmentFiles instanceof TempJavaBeanFragmentFiles) {
+            beanFragmentFiles = (TempJavaBeanFragmentFiles) tempJavaFragmentFiles;
+        }
+
+        TempJavaServiceFragmentFiles serviceFragmentFiles = null;
+        if (tempJavaFragmentFiles instanceof TempJavaServiceFragmentFiles) {
+            serviceFragmentFiles = (TempJavaServiceFragmentFiles) tempJavaFragmentFiles;
+        }
+
+        if ((generatedTempFiles & ATTRIBUTES_MASK) != 0) {
+            return tempJavaFragmentFiles
+                    .getTemporaryDataFromFileHandle(tempJavaFragmentFiles.getAttributesTempFileHandle());
+        } else if ((generatedTempFiles & GETTER_FOR_INTERFACE_MASK) != 0) {
+            return tempJavaFragmentFiles
+                    .getTemporaryDataFromFileHandle(tempJavaFragmentFiles.getGetterInterfaceTempFileHandle());
+        } else if ((generatedTempFiles & SETTER_FOR_INTERFACE_MASK) != 0) {
+            return tempJavaFragmentFiles
+                    .getTemporaryDataFromFileHandle(tempJavaFragmentFiles.getSetterInterfaceTempFileHandle());
+        } else if ((generatedTempFiles & GETTER_FOR_CLASS_MASK) != 0) {
+            return tempJavaFragmentFiles
+                    .getTemporaryDataFromFileHandle(tempJavaFragmentFiles.getGetterImplTempFileHandle());
+        } else if ((generatedTempFiles & SETTER_FOR_CLASS_MASK) != 0) {
+            return tempJavaFragmentFiles
+                    .getTemporaryDataFromFileHandle(tempJavaFragmentFiles.getSetterImplTempFileHandle());
+        } else if ((generatedTempFiles & CONSTRUCTOR_IMPL_MASK) != 0) {
+            if (beanFragmentFiles == null) {
+                throw new TranslatorException("Required constructor info is missing.");
+            }
+            return beanFragmentFiles
+                    .getTemporaryDataFromFileHandle(beanFragmentFiles.getConstructorImplTempFileHandle());
+        } else if ((generatedTempFiles & HASH_CODE_IMPL_MASK) != 0) {
+            return tempJavaFragmentFiles
+                    .getTemporaryDataFromFileHandle(tempJavaFragmentFiles.getHashCodeImplTempFileHandle());
+        } else if ((generatedTempFiles & EQUALS_IMPL_MASK) != 0) {
+            return tempJavaFragmentFiles
+                    .getTemporaryDataFromFileHandle(tempJavaFragmentFiles.getEqualsImplTempFileHandle());
+        } else if ((generatedTempFiles & TO_STRING_IMPL_MASK) != 0) {
+            return tempJavaFragmentFiles
+                    .getTemporaryDataFromFileHandle(tempJavaFragmentFiles.getToStringImplTempFileHandle());
+        } else if ((generatedTempFiles & OF_STRING_IMPL_MASK) != 0) {
+            if (typeFragmentFiles == null) {
+                throw new TranslatorException("Required of string implementation info is missing.");
+            }
+            return typeFragmentFiles
+                    .getTemporaryDataFromFileHandle(typeFragmentFiles.getOfStringImplTempFileHandle());
+        } else if ((generatedTempFiles & CONSTRUCTOR_FOR_TYPE_MASK) != 0) {
+            if (typeFragmentFiles == null) {
+                throw new TranslatorException("Required constructor implementation info is missing.");
+            }
+            return typeFragmentFiles
+                    .getTemporaryDataFromFileHandle(typeFragmentFiles.getConstructorForTypeTempFileHandle());
+        } else if ((generatedTempFiles & FROM_STRING_IMPL_MASK) != 0) {
+            return tempJavaFragmentFiles
+                    .getTemporaryDataFromFileHandle(tempJavaFragmentFiles.getFromStringImplTempFileHandle());
+        } else if ((generatedTempFiles & ENUM_IMPL_MASK) != 0) {
+            if (!(tempJavaFragmentFiles instanceof TempJavaEnumerationFragmentFiles)) {
+                throw new TranslatorException("Required enum info is missing.");
+            }
+            TempJavaEnumerationFragmentFiles enumFragmentFiles =
+                    (TempJavaEnumerationFragmentFiles) tempJavaFragmentFiles;
+            return enumFragmentFiles
+                    .getTemporaryDataFromFileHandle(enumFragmentFiles.getEnumClassTempFileHandle());
+        } else if ((generatedTempFiles & RPC_INTERFACE_MASK) != 0) {
+            if (serviceFragmentFiles == null) {
+                throw new TranslatorException("Required rpc interface info is missing.");
+            }
+            return serviceFragmentFiles
+                    .getTemporaryDataFromFileHandle(serviceFragmentFiles.getRpcInterfaceTempFileHandle());
+        } else if ((generatedTempFiles & RPC_IMPL_MASK) != 0) {
+            if (serviceFragmentFiles == null) {
+                throw new TranslatorException("Required rpc implementation info is missing.");
+            }
+            return serviceFragmentFiles
+                    .getTemporaryDataFromFileHandle(serviceFragmentFiles.getRpcImplTempFileHandle());
+        } else if ((generatedTempFiles & EVENT_ENUM_MASK) != 0) {
+            if (serviceFragmentFiles == null) {
+                throw new TranslatorException("Required rpc implementation info is missing.");
+            }
+            return serviceFragmentFiles
+                    .getTemporaryDataFromFileHandle(serviceFragmentFiles.getEventEnumTempFileHandle());
+        } else if ((generatedTempFiles & EVENT_METHOD_MASK) != 0) {
+            if (serviceFragmentFiles == null) {
+                throw new TranslatorException("Required rpc implementation info is missing.");
+            }
+            return serviceFragmentFiles
+                    .getTemporaryDataFromFileHandle(serviceFragmentFiles.getEventMethodTempFileHandle());
+        } else if ((generatedTempFiles & EVENT_SUBJECT_GETTER_MASK) != 0) {
+            if (serviceFragmentFiles == null) {
+                throw new TranslatorException("Required rpc implementation info is missing.");
+            }
+            return serviceFragmentFiles
+                    .getTemporaryDataFromFileHandle(serviceFragmentFiles.getEventSubjectGetterTempFileHandle());
+        } else if ((generatedTempFiles & EVENT_SUBJECT_SETTER_MASK) != 0) {
+            if (serviceFragmentFiles == null) {
+                throw new TranslatorException("Required rpc implementation info is missing.");
+            }
+            return serviceFragmentFiles
+                    .getTemporaryDataFromFileHandle(serviceFragmentFiles.getEventSubjectSetterTempFileHandle());
+        } else if ((generatedTempFiles & EVENT_SUBJECT_ATTRIBUTE_MASK) != 0) {
+            if (serviceFragmentFiles == null) {
+                throw new TranslatorException("Required rpc implementation info is missing.");
+            }
+            return serviceFragmentFiles
+                    .getTemporaryDataFromFileHandle(serviceFragmentFiles.getEventSubjectAttributeTempFileHandle());
+        }
+        return null;
+    }
+
+    /**
+     * Initiates generation of file based on generated file type.
+     *
+     * @param file         generated file
+     * @param className    generated file class name
+     * @param genType      generated file type
+     * @param imports      imports for the file
+     * @param pkg          generated file package
+     * @param pluginConfig plugin configurations
+     * @throws IOException when fails to generate a file
+     */
+    public static void initiateJavaFileGeneration(File file, String className, int genType, List<String> imports,
+            String pkg, YangPluginConfig pluginConfig)
+            throws IOException {
+
+        try {
+            file.createNewFile();
+            appendContents(file, className, genType, imports, pkg, pluginConfig);
+        } catch (IOException e) {
+            throw new IOException("Failed to create " + file.getName() + " class file.");
+        }
+    }
+
+    /**
+     * Initiates generation of file based on generated file type.
+     *
+     * @param file      generated file
+     * @param genType   generated file type
+     * @param imports   imports for the file
+     * @param curNode   current YANG node
+     * @param className class name
+     * @throws IOException when fails to generate a file
+     */
+    public static void initiateJavaFileGeneration(File file, int genType, List<String> imports,
+            YangNode curNode, String className)
+            throws IOException {
+
+        try {
+            if (file.exists()) {
+                throw new IOException(file.getName() + " is reused due to YANG naming");
+            }
+
+            file.createNewFile();
+            appendContents(file, genType, imports, curNode, className);
+        } catch (IOException e) {
+            throw new IOException("Failed to create " + file.getName() + " class file.");
+        }
+    }
+
+    /**
+     * Appends all the contents into a generated java file.
+     *
+     * @param file        generated file
+     * @param genType     generated file type
+     * @param importsList list of java imports
+     * @param curNode     current YANG node
+     * @param className   class name
+     * @throws IOException
+     */
+    private static void appendContents(File file, int genType, List<String> importsList, YangNode curNode,
+            String className)
+            throws IOException {
+
+        JavaFileInfo javaFileInfo = ((JavaFileInfoContainer) curNode).getJavaFileInfo();
+
+        String name = javaFileInfo.getJavaName();
+        String path = javaFileInfo.getBaseCodeGenPath() + javaFileInfo.getPackageFilePath();
+
+        String pkgString = null;
+        if (genType == GENERATE_EVENT_CLASS
+                || genType == GENERATE_EVENT_LISTENER_INTERFACE
+                || genType == GENERATE_EVENT_SUBJECT_CLASS) {
+            pkgString = parsePackageString((path + PERIOD + name).toLowerCase(), importsList);
+        } else {
+            pkgString = parsePackageString(path, importsList);
+        }
+        switch (genType) {
+            case INTERFACE_MASK:
+                appendHeaderContents(file, pkgString, importsList);
+                write(file, genType, INTERFACE, curNode, className);
+                break;
+            case GENERATE_SERVICE_AND_MANAGER:
+                appendHeaderContents(file, pkgString, importsList);
+                write(file, genType, RPC_INTERFACE, curNode, className);
+                break;
+            case GENERATE_EVENT_CLASS:
+                appendHeaderContents(file, pkgString, importsList);
+                write(file, genType, EVENT, curNode, className);
+                break;
+            case GENERATE_EVENT_LISTENER_INTERFACE:
+                appendHeaderContents(file, pkgString, importsList);
+                write(file, genType, EVENT_LISTENER, curNode, className);
+                break;
+            case GENERATE_EVENT_SUBJECT_CLASS:
+                appendHeaderContents(file, pkgString, importsList);
+                write(file, genType, EVENT_SUBJECT_CLASS, curNode, className);
+                break;
+            default:
+                break;
+        }
+    }
+
+    /**
+     * Appends all the contents into a generated java file.
+     *
+     * @param file         generated file
+     * @param fileName     generated file name
+     * @param genType      generated file type
+     * @param importsList  list of java imports
+     * @param pkg          generated file package
+     * @param pluginConfig plugin configurations
+     * @throws IOException when fails to append contents
+     */
+    private static void appendContents(File file, String fileName, int genType, List<String> importsList, String pkg,
+            YangPluginConfig pluginConfig)
+            throws IOException {
+
+        String pkgString = parsePackageString(pkg, importsList);
+
+        switch (genType) {
+            case IMPL_CLASS_MASK:
+                write(file, fileName, genType, IMPL_CLASS, pluginConfig);
+                break;
+            case BUILDER_INTERFACE_MASK:
+                write(file, fileName, genType, BUILDER_INTERFACE, pluginConfig);
+                break;
+            case GENERATE_TYPEDEF_CLASS:
+                appendHeaderContents(file, pkgString, importsList);
+                write(file, fileName, genType, IMPL_CLASS, pluginConfig);
+                break;
+            case BUILDER_CLASS_MASK:
+                appendHeaderContents(file, pkgString, importsList);
+                write(file, fileName, genType, BUILDER_CLASS, pluginConfig);
+                break;
+            case GENERATE_UNION_CLASS:
+                appendHeaderContents(file, pkgString, importsList);
+                write(file, fileName, genType, IMPL_CLASS, pluginConfig);
+                break;
+            case GENERATE_ENUM_CLASS:
+                appendHeaderContents(file, pkgString, importsList);
+                write(file, fileName, genType, ENUM_CLASS, pluginConfig);
+                break;
+            default:
+                break;
+        }
+    }
+
+    /**
+     * Removes base directory path from package and generates package string for file.
+     *
+     * @param javaPkg     generated java package
+     * @param importsList list of imports
+     * @return package string
+     */
+    private static String parsePackageString(String javaPkg, List<String> importsList) {
+
+        javaPkg = parsePkg(getJavaPackageFromPackagePath(javaPkg));
+        if (importsList != null) {
+            if (!importsList.isEmpty()) {
+                return PACKAGE + SPACE + javaPkg + SEMI_COLAN + NEW_LINE;
+            } else {
+                return PACKAGE + SPACE + javaPkg + SEMI_COLAN;
+            }
+        } else {
+            return PACKAGE + SPACE + javaPkg + SEMI_COLAN;
+        }
+    }
+
+    /**
+     * Appends other contents to interface, builder and typedef classes.
+     * for example : ONOS copyright, imports and package.
+     *
+     * @param file        generated file
+     * @param pkg         generated package
+     * @param importsList list of imports
+     * @throws IOException when fails to append contents
+     */
+    private static void appendHeaderContents(File file, String pkg, List<String> importsList)
+            throws IOException {
+
+        insertDataIntoJavaFile(file, CopyrightHeader.getCopyrightHeader());
+        insertDataIntoJavaFile(file, pkg);
+
+        /*
+         * TODO: add the file header using
+         * JavaCodeSnippetGen.getFileHeaderComment
+         */
+
+        if (importsList != null) {
+            insertDataIntoJavaFile(file, NEW_LINE);
+            for (String imports : importsList) {
+                insertDataIntoJavaFile(file, imports);
+            }
+        }
+    }
+
+    /**
+     * Writes data to the specific generated file.
+     *
+     * @param file        generated file
+     * @param genType     generated file type
+     * @param javaDocType java doc type
+     * @param curNode     current YANG node
+     * @param fileName    file name
+     * @throws IOException when fails to write into a file
+     */
+    private static void write(File file, int genType, JavaDocType javaDocType, YangNode curNode, String fileName)
+            throws IOException {
+
+        YangPluginConfig pluginConfig = ((JavaFileInfoContainer) curNode).getJavaFileInfo().getPluginConfig();
+        if ((genType & GENERATE_SERVICE_AND_MANAGER) != 0) {
+            if (!fileName.matches(REGEX_FOR_ANY_STRING_ENDING_WITH_SERVICE)) {
+                insertDataIntoJavaFile(file, getJavaDoc(RPC_MANAGER, fileName, false, pluginConfig));
+                insertDataIntoJavaFile(file, addComponentString());
+            } else {
+                insertDataIntoJavaFile(file, getJavaDoc(javaDocType, fileName, false, pluginConfig));
+            }
+        } else {
+            insertDataIntoJavaFile(file, getJavaDoc(javaDocType, fileName, false, pluginConfig));
+        }
+        insertDataIntoJavaFile(file, generateClassDefinition(genType, fileName, curNode));
+    }
+
+    /**
+     * Writes data to the specific generated file.
+     *
+     * @param file         generated file
+     * @param fileName     file name
+     * @param genType      generated file type
+     * @param javaDocType  java doc type
+     * @param pluginConfig plugin configurations
+     * @throws IOException when fails to write into a file
+     */
+    private static void write(File file, String fileName, int genType, JavaDocType javaDocType,
+            YangPluginConfig pluginConfig)
+            throws IOException {
+        insertDataIntoJavaFile(file, getJavaDoc(javaDocType, fileName, false, pluginConfig));
+        insertDataIntoJavaFile(file, generateClassDefinition(genType, fileName));
+    }
+
+    /**
+     * Returns integer attribute for enum's class to get the values.
+     *
+     * @param className enum's class name
+     * @return enum's attribute
+     */
+    public static String getEnumsValueAttribute(String className) {
+        return NEW_LINE + FOUR_SPACE_INDENTATION + PRIVATE + SPACE + INT + SPACE + getSmallCase(className)
+                + SEMI_COLAN + NEW_LINE;
+    }
+
+    /**
+     * Returns component string.
+     *
+     * @return component string
+     */
+    public static String addComponentString() {
+        return NEW_LINE + COMPONENT_ANNOTATION + SPACE + OPEN_PARENTHESIS + IMMEDIATE + SPACE
+                + EQUAL + SPACE + TRUE + CLOSE_PARENTHESIS + NEW_LINE + SERVICE_ANNOTATION;
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/utils/JavaIdentifierSyntax.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/utils/JavaIdentifierSyntax.java
new file mode 100644
index 0000000..95355aa
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/utils/JavaIdentifierSyntax.java
@@ -0,0 +1,490 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.translator.tojava.utils;
+
+import java.util.ArrayList;
+import java.util.Arrays;
+import java.util.List;
+
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.utils.DataModelUtils;
+import org.onosproject.yangutils.translator.exception.TranslatorException;
+import org.onosproject.yangutils.translator.tojava.JavaFileInfoContainer;
+import org.onosproject.yangutils.translator.tojava.JavaFileInfo;
+
+import static org.onosproject.yangutils.utils.UtilConstants.COLAN;
+import static org.onosproject.yangutils.utils.UtilConstants.DEFAULT_BASE_PKG;
+import static org.onosproject.yangutils.utils.UtilConstants.EMPTY_STRING;
+import static org.onosproject.yangutils.utils.UtilConstants.HYPHEN;
+import static org.onosproject.yangutils.utils.UtilConstants.JAVA_KEY_WORDS;
+import static org.onosproject.yangutils.utils.UtilConstants.PERIOD;
+import static org.onosproject.yangutils.utils.UtilConstants.QUOTES;
+import static org.onosproject.yangutils.utils.UtilConstants.REGEX_FOR_DIGITS_WITH_SINGLE_LETTER;
+import static org.onosproject.yangutils.utils.UtilConstants.REGEX_FOR_FIRST_DIGIT;
+import static org.onosproject.yangutils.utils.UtilConstants.REGEX_FOR_HYPHEN;
+import static org.onosproject.yangutils.utils.UtilConstants.REGEX_FOR_IDENTIFIER_SPECIAL_CHAR;
+import static org.onosproject.yangutils.utils.UtilConstants.REGEX_FOR_PERIOD;
+import static org.onosproject.yangutils.utils.UtilConstants.REGEX_FOR_SINGLE_LETTER;
+import static org.onosproject.yangutils.utils.UtilConstants.REGEX_FOR_UNDERSCORE;
+import static org.onosproject.yangutils.utils.UtilConstants.REGEX_WITH_ALL_SPECIAL_CHAR;
+import static org.onosproject.yangutils.utils.UtilConstants.REGEX_WITH_DIGITS;
+import static org.onosproject.yangutils.utils.UtilConstants.REGEX_WITH_SINGLE_CAPITAL_CASE;
+import static org.onosproject.yangutils.utils.UtilConstants.REGEX_WITH_SINGLE_CAPITAL_CASE_AND_DIGITS_SMALL_CASES;
+import static org.onosproject.yangutils.utils.UtilConstants.REGEX_WITH_UPPERCASE;
+import static org.onosproject.yangutils.utils.UtilConstants.REVISION_PREFIX;
+import static org.onosproject.yangutils.utils.UtilConstants.SLASH;
+import static org.onosproject.yangutils.utils.UtilConstants.UNDER_SCORE;
+import static org.onosproject.yangutils.utils.UtilConstants.VERSION_PREFIX;
+import static org.onosproject.yangutils.utils.UtilConstants.YANG_AUTO_PREFIX;
+
+/**
+ * Represents an utility Class for translating the name from YANG to java convention.
+ */
+public final class JavaIdentifierSyntax {
+
+    private static final int MAX_MONTHS = 12;
+    private static final int MAX_DAYS = 31;
+    private static final int INDEX_ZERO = 0;
+    private static final int INDEX_ONE = 1;
+    private static final int INDEX_TWO = 2;
+    private static final int VALUE_CHECK = 10;
+    private static final String ZERO = "0";
+
+    /**
+     * Create instance of java identifier syntax.
+     */
+    private JavaIdentifierSyntax() {
+    }
+
+    /**
+     * Returns the root package string.
+     *
+     * @param version YANG version
+     * @param nameSpace name space of the module
+     * @param revision revision of the module defined
+     * @param conflictResolver object of YANG to java naming conflict util
+     * @return the root package string
+     */
+    public static String getRootPackage(byte version, String nameSpace, String revision,
+            YangToJavaNamingConflictUtil conflictResolver) {
+
+        String pkg;
+        pkg = DEFAULT_BASE_PKG;
+        pkg = pkg + PERIOD;
+        pkg = pkg + getYangVersion(version);
+        pkg = pkg + PERIOD;
+        pkg = pkg + getPkgFromNameSpace(nameSpace, conflictResolver);
+        pkg = pkg + PERIOD;
+        pkg = pkg + getYangRevisionStr(revision);
+
+        return pkg.toLowerCase();
+    }
+
+    /**
+     * Returns the node package string.
+     *
+     * @param curNode current java node whose package string needs to be set
+     * @return returns the root package string
+     */
+    public static String getCurNodePackage(YangNode curNode) {
+
+        String pkg;
+        if (!(curNode instanceof JavaFileInfoContainer)
+                || curNode.getParent() == null) {
+            throw new TranslatorException("missing parent node to get current node's package");
+        }
+
+        YangNode parentNode = DataModelUtils.getParentNodeInGenCode(curNode);
+        if (!(parentNode instanceof JavaFileInfoContainer)) {
+            throw new TranslatorException("missing parent java node to get current node's package");
+        }
+        JavaFileInfo parentJavaFileHandle = ((JavaFileInfoContainer) parentNode).getJavaFileInfo();
+        pkg = parentJavaFileHandle.getPackage() + PERIOD + parentJavaFileHandle.getJavaName();
+        return pkg.toLowerCase();
+    }
+
+    /**
+     * Returns version.
+     *
+     * @param ver YANG version
+     * @return version
+     */
+    private static String getYangVersion(byte ver) {
+        return VERSION_PREFIX + ver;
+    }
+
+    /**
+     * Returns package name from name space.
+     *
+     * @param nameSpace name space of YANG module
+     * @param conflictResolver object of YANG to java naming conflict util
+     * @return java package name as per java rules
+     */
+    private static String getPkgFromNameSpace(String nameSpace, YangToJavaNamingConflictUtil conflictResolver) {
+
+        ArrayList<String> pkgArr = new ArrayList<String>();
+        nameSpace = nameSpace.replace(QUOTES, EMPTY_STRING);
+        String properNameSpace = nameSpace.replaceAll(REGEX_WITH_ALL_SPECIAL_CHAR, COLAN);
+        String[] nameSpaceArr = properNameSpace.split(COLAN);
+
+        for (String nameSpaceString : nameSpaceArr) {
+            pkgArr.add(nameSpaceString);
+        }
+        return getPkgFrmArr(pkgArr, conflictResolver);
+    }
+
+    /**
+     * Returns revision string array.
+     *
+     * @param date YANG module revision
+     * @return revision string
+     * @throws TranslatorException when date is invalid.
+     */
+    private static String getYangRevisionStr(String date) throws TranslatorException {
+
+        String[] revisionArr = date.split(HYPHEN);
+
+        String rev = REVISION_PREFIX;
+        rev = rev + revisionArr[INDEX_ZERO];
+
+        if (Integer.parseInt(revisionArr[INDEX_ONE]) <= MAX_MONTHS
+                && Integer.parseInt(revisionArr[INDEX_TWO]) <= MAX_DAYS) {
+            for (int i = INDEX_ONE; i < revisionArr.length; i++) {
+
+                Integer val = Integer.parseInt(revisionArr[i]);
+                if (val < VALUE_CHECK) {
+                    rev = rev + ZERO;
+                }
+                rev = rev + val;
+            }
+
+            return rev;
+        } else {
+            throw new TranslatorException("Date in revision is not proper: " + date);
+        }
+    }
+
+    /**
+     * Returns the package string.
+     *
+     * @param pkgArr package array
+     * @param conflictResolver object of YANG to java naming conflict util
+     * @return package string
+     */
+    private static String getPkgFrmArr(ArrayList<String> pkgArr, YangToJavaNamingConflictUtil conflictResolver) {
+
+        String pkg = EMPTY_STRING;
+        int size = pkgArr.size();
+        int i = 0;
+        for (String member : pkgArr) {
+            boolean presenceOfKeyword = JAVA_KEY_WORDS.contains(member.toLowerCase());
+            if (presenceOfKeyword || member.matches(REGEX_FOR_FIRST_DIGIT)) {
+                String prefix = getPrefixForIdentifier(conflictResolver);
+                member = prefix + member;
+            }
+            pkg = pkg + member;
+            if (i != size - 1) {
+                pkg = pkg + PERIOD;
+            }
+            i++;
+        }
+        return pkg;
+    }
+
+    /**
+     * Prefix for adding with identifier and namespace, when it is a java keyword or starting with digits.
+     *
+     * @param conflictResolver object of YANG to java naming conflict util
+     * @return prefix which needs to be added
+     */
+    public static String getPrefixForIdentifier(YangToJavaNamingConflictUtil conflictResolver) {
+
+        String prefixForIdentifier = null;
+        if (conflictResolver != null) {
+            prefixForIdentifier = conflictResolver.getPrefixForIdentifier();
+        }
+        if (prefixForIdentifier != null) {
+            prefixForIdentifier = prefixForIdentifier.replaceAll(REGEX_WITH_ALL_SPECIAL_CHAR, COLAN);
+            String[] strArray = prefixForIdentifier.split(COLAN);
+            try {
+                if (strArray[0].isEmpty()) {
+                    List<String> stringArrangement = new ArrayList<String>();
+                    for (int i = 1; i < strArray.length; i++) {
+                        stringArrangement.add(strArray[i]);
+                    }
+                    strArray = stringArrangement.toArray(new String[stringArrangement.size()]);
+                }
+                prefixForIdentifier = strArray[0];
+                for (int j = 1; j < strArray.length; j++) {
+                    prefixForIdentifier = prefixForIdentifier + strArray[j].substring(0, 1).toUpperCase() +
+                            strArray[j].substring(1);
+                }
+            } catch (ArrayIndexOutOfBoundsException outOfBoundsException) {
+                throw new TranslatorException("The given prefix in pom.xml is invalid.");
+            }
+        } else {
+            prefixForIdentifier = YANG_AUTO_PREFIX;
+        }
+        return prefixForIdentifier;
+    }
+
+    /**
+     * Returns the YANG identifier name as java identifier.
+     *
+     * @param yangIdentifier identifier in YANG file
+     * @param conflictResolver object of YANG to java naming conflict util
+     * @return corresponding java identifier
+     */
+    public static String getCamelCase(String yangIdentifier, YangToJavaNamingConflictUtil conflictResolver) {
+
+        if (conflictResolver != null) {
+            String replacementForHyphen = conflictResolver.getReplacementForHyphen();
+            String replacementForPeriod = conflictResolver.getReplacementForPeriod();
+            String replacementForUnderscore = conflictResolver.getReplacementForUnderscore();
+            if (replacementForPeriod != null) {
+                yangIdentifier = yangIdentifier.replaceAll(REGEX_FOR_PERIOD,
+                        PERIOD + replacementForPeriod.toLowerCase() + PERIOD);
+            }
+            if (replacementForUnderscore != null) {
+                yangIdentifier = yangIdentifier.replaceAll(REGEX_FOR_UNDERSCORE,
+                        UNDER_SCORE + replacementForUnderscore.toLowerCase() + UNDER_SCORE);
+            }
+            if (replacementForHyphen != null) {
+                yangIdentifier = yangIdentifier.replaceAll(REGEX_FOR_HYPHEN,
+                        HYPHEN + replacementForHyphen.toLowerCase() + HYPHEN);
+            }
+        }
+        yangIdentifier = yangIdentifier.replaceAll(REGEX_FOR_IDENTIFIER_SPECIAL_CHAR, COLAN);
+        String[] strArray = yangIdentifier.split(COLAN);
+        if (strArray[0].isEmpty()) {
+            List<String> stringArrangement = new ArrayList<String>();
+            for (int i = 1; i < strArray.length; i++) {
+                stringArrangement.add(strArray[i]);
+            }
+            strArray = stringArrangement.toArray(new String[stringArrangement.size()]);
+        }
+        return upperCaseConflictResolver(strArray, conflictResolver);
+    }
+
+    /**
+     * Resolves the conflict when input has upper case.
+     *
+     * @param stringArray containing strings for upper case conflict resolver
+     * @param conflictResolver object of YANG to java naming conflict util
+     * @return camel cased string
+     */
+    private static String upperCaseConflictResolver(String[] stringArray,
+            YangToJavaNamingConflictUtil conflictResolver) {
+
+        for (int l = 0; l < stringArray.length; l++) {
+            String[] upperCaseSplitArray = stringArray[l].split(REGEX_WITH_UPPERCASE);
+            for (int m = 0; m < upperCaseSplitArray.length; m++) {
+                if (upperCaseSplitArray[m].matches(REGEX_WITH_SINGLE_CAPITAL_CASE)) {
+                    int check = m;
+                    while (check + 1 < upperCaseSplitArray.length) {
+                        if (upperCaseSplitArray[check + 1].matches(REGEX_WITH_SINGLE_CAPITAL_CASE)) {
+                            upperCaseSplitArray[check + 1] = upperCaseSplitArray[check + 1].toLowerCase();
+                            check = check + 1;
+                        } else if (upperCaseSplitArray[check + 1]
+                                .matches(REGEX_WITH_SINGLE_CAPITAL_CASE_AND_DIGITS_SMALL_CASES)) {
+                            upperCaseSplitArray[check + 1] = upperCaseSplitArray[check + 1].toLowerCase();
+                            break;
+                        } else {
+                            break;
+                        }
+                    }
+                }
+            }
+            StringBuilder strBuilder = new StringBuilder();
+            for (String element : upperCaseSplitArray) {
+                strBuilder.append(element);
+            }
+            stringArray[l] = strBuilder.toString();
+        }
+        List<String> result = new ArrayList<String>();
+        for (String element : stringArray) {
+            String[] capitalCaseSplitArray = element.split(REGEX_WITH_UPPERCASE);
+            for (String letter : capitalCaseSplitArray) {
+                String[] arrayForAddition = letter.split(REGEX_WITH_DIGITS);
+                List<String> list = Arrays.asList(arrayForAddition);
+                for (String str : list) {
+                    if (str != null && !str.isEmpty()) {
+                        result.add(str);
+                    }
+                }
+            }
+        }
+        stringArray = result.toArray(new String[result.size()]);
+        return applyCamelCaseRule(stringArray, conflictResolver);
+    }
+
+    /**
+     * Applies the rule that a string does not end with a capitalized letter and capitalizes
+     * the letter next to a number in an array.
+     *
+     * @param stringArray containing strings for camel case separation
+     * @param conflictResolver object of YANG to java naming conflict util
+     * @return camel case rule checked string
+     */
+    private static String applyCamelCaseRule(String[] stringArray, YangToJavaNamingConflictUtil conflictResolver) {
+
+        String ruleChecker = stringArray[0].toLowerCase();
+        int i;
+        if (ruleChecker.matches(REGEX_FOR_FIRST_DIGIT)) {
+            i = 0;
+            ruleChecker = EMPTY_STRING;
+        } else {
+            i = 1;
+        }
+        for (; i < stringArray.length; i++) {
+            if (i + 1 == stringArray.length) {
+                if (stringArray[i].matches(REGEX_FOR_SINGLE_LETTER)
+                        || stringArray[i].matches(REGEX_FOR_DIGITS_WITH_SINGLE_LETTER)) {
+                    ruleChecker = ruleChecker + stringArray[i].toLowerCase();
+                    break;
+                }
+            }
+            if (stringArray[i].matches(REGEX_FOR_FIRST_DIGIT)) {
+                for (int j = 0; j < stringArray[i].length(); j++) {
+                    char letterCheck = stringArray[i].charAt(j);
+                    if (Character.isLetter(letterCheck)) {
+                        stringArray[i] = stringArray[i].substring(0, j)
+                                + stringArray[i].substring(j, j + 1).toUpperCase() + stringArray[i].substring(j + 1);
+                        break;
+                    }
+                }
+                ruleChecker = ruleChecker + stringArray[i];
+            } else {
+                ruleChecker = ruleChecker + stringArray[i].substring(0, 1).toUpperCase() + stringArray[i].substring(1);
+            }
+        }
+        String ruleCheckerWithPrefix = addPrefix(ruleChecker, conflictResolver);
+        return restrictConsecutiveCapitalCase(ruleCheckerWithPrefix);
+    }
+
+    /**
+     * Adds prefix, if the string begins with digit or is a java key word.
+     *
+     * @param camelCasePrefix string for adding prefix
+     * @param conflictResolver object of YANG to java naming conflict util
+     * @return prefixed camel case string
+     */
+    private static String addPrefix(String camelCasePrefix, YangToJavaNamingConflictUtil conflictResolver) {
+
+        String prefix = getPrefixForIdentifier(conflictResolver);
+        if (camelCasePrefix.matches(REGEX_FOR_FIRST_DIGIT)) {
+            camelCasePrefix = prefix + camelCasePrefix;
+        }
+        if (JAVA_KEY_WORDS.contains(camelCasePrefix)) {
+            camelCasePrefix = prefix + camelCasePrefix.substring(0, 1).toUpperCase()
+                    + camelCasePrefix.substring(1);
+        }
+        return camelCasePrefix;
+    }
+
+    /**
+     * Restricts consecutive capital cased string as a rule in camel case.
+     *
+     * @param consecCapitalCaseRemover which requires the restriction of consecutive capital case
+     * @return string without consecutive capital case
+     */
+    private static String restrictConsecutiveCapitalCase(String consecCapitalCaseRemover) {
+
+        for (int k = 0; k < consecCapitalCaseRemover.length(); k++) {
+            if (k + 1 < consecCapitalCaseRemover.length()) {
+                if (Character.isUpperCase(consecCapitalCaseRemover.charAt(k))) {
+                    if (Character.isUpperCase(consecCapitalCaseRemover.charAt(k + 1))) {
+                        consecCapitalCaseRemover = consecCapitalCaseRemover.substring(0, k + 1)
+                                + consecCapitalCaseRemover.substring(k + 1, k + 2).toLowerCase()
+                                + consecCapitalCaseRemover.substring(k + 2);
+                    }
+                }
+            }
+        }
+        return consecCapitalCaseRemover;
+    }
+
+    /**
+     * Returns the YANG identifier name as java identifier with first letter
+     * in capital.
+     *
+     * @param yangIdentifier identifier in YANG file
+     * @return corresponding java identifier
+     */
+    public static String getCapitalCase(String yangIdentifier) {
+        yangIdentifier = yangIdentifier.substring(0, 1).toUpperCase() + yangIdentifier.substring(1);
+        return restrictConsecutiveCapitalCase(yangIdentifier);
+    }
+
+    /**
+     * Returns the YANG identifier name as java identifier with first letter
+     * in small.
+     *
+     * @param yangIdentifier identifier in YANG file.
+     * @return corresponding java identifier
+     */
+    public static String getSmallCase(String yangIdentifier) {
+        return yangIdentifier.substring(0, 1).toLowerCase() + yangIdentifier.substring(1);
+    }
+
+    /**
+     * Returns the java Package from package path.
+     *
+     * @param packagePath package path
+     * @return java package
+     */
+    public static String getJavaPackageFromPackagePath(String packagePath) {
+        return packagePath.replace(SLASH, PERIOD);
+    }
+
+    /**
+     * Returns enum's java name.
+     *
+     * @param name enum's name
+     * @return enum's java name
+     */
+    public static String getEnumJavaAttribute(String name) {
+
+        name = name.replaceAll(REGEX_WITH_ALL_SPECIAL_CHAR, COLAN);
+        String[] strArray = name.split(COLAN);
+        String output = EMPTY_STRING;
+        if (strArray[0].isEmpty()) {
+            List<String> stringArrangement = new ArrayList<String>();
+            for (int i = 1; i < strArray.length; i++) {
+                stringArrangement.add(strArray[i]);
+            }
+            strArray = stringArrangement.toArray(new String[stringArrangement.size()]);
+        }
+        for (int i = 0; i < strArray.length; i++) {
+            if (i > 0 && i < strArray.length) {
+                output = output + UNDER_SCORE;
+            }
+            output = output + strArray[i];
+        }
+        return output;
+    }
+
+    /**
+     * Returns the directory path corresponding to java package.
+     *
+     * @param packagePath package path
+     * @return java package
+     */
+    public static String getPackageDirPathFromJavaJPackage(String packagePath) {
+        return packagePath.replace(PERIOD, SLASH);
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/utils/MethodsGenerator.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/utils/MethodsGenerator.java
new file mode 100644
index 0000000..b6889c8
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/utils/MethodsGenerator.java
@@ -0,0 +1,1086 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.translator.tojava.utils;
+
+import java.util.List;
+import java.util.Map;
+
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangNodeIdentifier;
+import org.onosproject.yangutils.translator.exception.TranslatorException;
+import org.onosproject.yangutils.translator.tojava.JavaAttributeInfo;
+import org.onosproject.yangutils.translator.tojava.javamodel.YangJavaAugment;
+import org.onosproject.yangutils.utils.io.impl.JavaDocGen;
+
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.GENERATE_EVENT_SUBJECT_CLASS;
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.GENERATE_SERVICE_AND_MANAGER;
+import static org.onosproject.yangutils.translator.tojava.utils.AttributesJavaDataType.getParseFromStringMethod;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaIdentifierSyntax.getCamelCase;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaIdentifierSyntax.getCapitalCase;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaIdentifierSyntax.getSmallCase;
+import static org.onosproject.yangutils.utils.UtilConstants.ACTIVATE;
+import static org.onosproject.yangutils.utils.UtilConstants.ACTIVATE_ANNOTATION;
+import static org.onosproject.yangutils.utils.UtilConstants.ADD_STRING;
+import static org.onosproject.yangutils.utils.UtilConstants.AND;
+import static org.onosproject.yangutils.utils.UtilConstants.AUGMENTABLE;
+import static org.onosproject.yangutils.utils.UtilConstants.AUGMENTATION;
+import static org.onosproject.yangutils.utils.UtilConstants.AUGMENTED_INFO;
+import static org.onosproject.yangutils.utils.UtilConstants.BOOLEAN_DATA_TYPE;
+import static org.onosproject.yangutils.utils.UtilConstants.BUILD;
+import static org.onosproject.yangutils.utils.UtilConstants.BUILDER;
+import static org.onosproject.yangutils.utils.UtilConstants.BYTE;
+import static org.onosproject.yangutils.utils.UtilConstants.CASE;
+import static org.onosproject.yangutils.utils.UtilConstants.CATCH;
+import static org.onosproject.yangutils.utils.UtilConstants.CHECK_NOT_NULL_STRING;
+import static org.onosproject.yangutils.utils.UtilConstants.CLEAR;
+import static org.onosproject.yangutils.utils.UtilConstants.CLOSE_CURLY_BRACKET;
+import static org.onosproject.yangutils.utils.UtilConstants.CLOSE_PARENTHESIS;
+import static org.onosproject.yangutils.utils.UtilConstants.COLAN;
+import static org.onosproject.yangutils.utils.UtilConstants.COMMA;
+import static org.onosproject.yangutils.utils.UtilConstants.DEACTIVATE;
+import static org.onosproject.yangutils.utils.UtilConstants.DEACTIVATE_ANNOTATION;
+import static org.onosproject.yangutils.utils.UtilConstants.DEFAULT;
+import static org.onosproject.yangutils.utils.UtilConstants.DIAMOND_CLOSE_BRACKET;
+import static org.onosproject.yangutils.utils.UtilConstants.DIAMOND_OPEN_BRACKET;
+import static org.onosproject.yangutils.utils.UtilConstants.EIGHT_SPACE_INDENTATION;
+import static org.onosproject.yangutils.utils.UtilConstants.EMPTY_STRING;
+import static org.onosproject.yangutils.utils.UtilConstants.EQUAL;
+import static org.onosproject.yangutils.utils.UtilConstants.EQUALS_STRING;
+import static org.onosproject.yangutils.utils.UtilConstants.EXCEPTION;
+import static org.onosproject.yangutils.utils.UtilConstants.EXCEPTION_VAR;
+import static org.onosproject.yangutils.utils.UtilConstants.FALSE;
+import static org.onosproject.yangutils.utils.UtilConstants.FOUR_SPACE_INDENTATION;
+import static org.onosproject.yangutils.utils.UtilConstants.FROM_STRING_METHOD_NAME;
+import static org.onosproject.yangutils.utils.UtilConstants.FROM_STRING_PARAM_NAME;
+import static org.onosproject.yangutils.utils.UtilConstants.GET_METHOD_PREFIX;
+import static org.onosproject.yangutils.utils.UtilConstants.GOOGLE_MORE_OBJECT_METHOD_STRING;
+import static org.onosproject.yangutils.utils.UtilConstants.HASH;
+import static org.onosproject.yangutils.utils.UtilConstants.HASH_CODE_STRING;
+import static org.onosproject.yangutils.utils.UtilConstants.IF;
+import static org.onosproject.yangutils.utils.UtilConstants.IMPL;
+import static org.onosproject.yangutils.utils.UtilConstants.INSTANCE_OF;
+import static org.onosproject.yangutils.utils.UtilConstants.INT;
+import static org.onosproject.yangutils.utils.UtilConstants.LIST;
+import static org.onosproject.yangutils.utils.UtilConstants.LONG;
+import static org.onosproject.yangutils.utils.UtilConstants.NEW;
+import static org.onosproject.yangutils.utils.UtilConstants.NEW_LINE;
+import static org.onosproject.yangutils.utils.UtilConstants.NULL;
+import static org.onosproject.yangutils.utils.UtilConstants.OBJ;
+import static org.onosproject.yangutils.utils.UtilConstants.OBJECT;
+import static org.onosproject.yangutils.utils.UtilConstants.OBJECT_STRING;
+import static org.onosproject.yangutils.utils.UtilConstants.OF;
+import static org.onosproject.yangutils.utils.UtilConstants.OMIT_NULL_VALUE_STRING;
+import static org.onosproject.yangutils.utils.UtilConstants.OPEN_CURLY_BRACKET;
+import static org.onosproject.yangutils.utils.UtilConstants.OPEN_PARENTHESIS;
+import static org.onosproject.yangutils.utils.UtilConstants.OTHER;
+import static org.onosproject.yangutils.utils.UtilConstants.OVERRIDE;
+import static org.onosproject.yangutils.utils.UtilConstants.PERIOD;
+import static org.onosproject.yangutils.utils.UtilConstants.PUBLIC;
+import static org.onosproject.yangutils.utils.UtilConstants.QUOTES;
+import static org.onosproject.yangutils.utils.UtilConstants.RETURN;
+import static org.onosproject.yangutils.utils.UtilConstants.RPC_INPUT_VAR_NAME;
+import static org.onosproject.yangutils.utils.UtilConstants.SEMI_COLAN;
+import static org.onosproject.yangutils.utils.UtilConstants.SET_METHOD_PREFIX;
+import static org.onosproject.yangutils.utils.UtilConstants.SHORT;
+import static org.onosproject.yangutils.utils.UtilConstants.SIXTEEN_SPACE_INDENTATION;
+import static org.onosproject.yangutils.utils.UtilConstants.SPACE;
+import static org.onosproject.yangutils.utils.UtilConstants.STARTED_LOG_INFO;
+import static org.onosproject.yangutils.utils.UtilConstants.STATIC;
+import static org.onosproject.yangutils.utils.UtilConstants.STOPPED_LOG_INFO;
+import static org.onosproject.yangutils.utils.UtilConstants.STRING_DATA_TYPE;
+import static org.onosproject.yangutils.utils.UtilConstants.SUFFIX_S;
+import static org.onosproject.yangutils.utils.UtilConstants.SWITCH;
+import static org.onosproject.yangutils.utils.UtilConstants.THIS;
+import static org.onosproject.yangutils.utils.UtilConstants.TMP_VAL;
+import static org.onosproject.yangutils.utils.UtilConstants.TO;
+import static org.onosproject.yangutils.utils.UtilConstants.TRUE;
+import static org.onosproject.yangutils.utils.UtilConstants.TRY;
+import static org.onosproject.yangutils.utils.UtilConstants.TWELVE_SPACE_INDENTATION;
+import static org.onosproject.yangutils.utils.UtilConstants.VALUE;
+import static org.onosproject.yangutils.utils.UtilConstants.VOID;
+import static org.onosproject.yangutils.utils.UtilConstants.YANG_UTILS_TODO;
+import static org.onosproject.yangutils.utils.io.impl.JavaDocGen.getJavaDoc;
+import static org.onosproject.yangutils.utils.io.impl.JavaDocGen.JavaDocType.BUILD_METHOD;
+import static org.onosproject.yangutils.utils.io.impl.JavaDocGen.JavaDocType.CONSTRUCTOR;
+import static org.onosproject.yangutils.utils.io.impl.JavaDocGen.JavaDocType.DEFAULT_CONSTRUCTOR;
+import static org.onosproject.yangutils.utils.io.impl.JavaDocGen.JavaDocType.FROM_METHOD;
+import static org.onosproject.yangutils.utils.io.impl.JavaDocGen.JavaDocType.GETTER_METHOD;
+import static org.onosproject.yangutils.utils.io.impl.JavaDocGen.JavaDocType.MANAGER_SETTER_METHOD;
+import static org.onosproject.yangutils.utils.io.impl.JavaDocGen.JavaDocType.OF_METHOD;
+import static org.onosproject.yangutils.utils.io.impl.JavaDocGen.JavaDocType.SETTER_METHOD;
+import static org.onosproject.yangutils.utils.io.impl.JavaDocGen.JavaDocType.TYPE_CONSTRUCTOR;
+import static org.onosproject.yangutils.utils.io.impl.YangIoUtils.trimAtLast;
+
+/**
+ * Represents generator for methods of generated files based on the file type.
+ */
+public final class MethodsGenerator {
+
+    /**
+     * Creates an instance of method generator.
+     */
+    private MethodsGenerator() {
+    }
+
+    /**
+     * Returns the methods strings for builder interface.
+     *
+     * @param name attribute name
+     * @param pluginConfig plugin configurations
+     * @return method string for builder interface
+     */
+    public static String parseBuilderInterfaceBuildMethodString(String name, YangPluginConfig pluginConfig) {
+        return getJavaDoc(BUILD_METHOD, name, false, pluginConfig) + getBuildForInterface(name);
+    }
+
+    /**
+     * Returns getter string.
+     *
+     * @param attr attribute info
+     * @param generatedJavaFiles generated java files
+     * @param pluginConfig plugin configurations
+     * @return getter string
+     */
+    public static String getGetterString(JavaAttributeInfo attr, int generatedJavaFiles,
+            YangPluginConfig pluginConfig) {
+
+        String returnType = getReturnType(attr);
+        String attributeName = attr.getAttributeName();
+
+        return getJavaDoc(GETTER_METHOD, attributeName, attr.isListAttr(), pluginConfig)
+                + getGetterForInterface(attributeName, returnType, attr.isListAttr(), generatedJavaFiles);
+    }
+
+    /**
+     * Returns setter string.
+     *
+     * @param attr attribute info
+     * @param className java class name
+     * @param generatedJavaFiles generated java files
+     * @param pluginConfig plugin configurations
+     * @return setter string
+     */
+    public static String getSetterString(JavaAttributeInfo attr, String className, int generatedJavaFiles,
+            YangPluginConfig pluginConfig) {
+
+        String attrType = getReturnType(attr);
+        String attributeName = attr.getAttributeName();
+        JavaDocGen.JavaDocType type;
+        if ((generatedJavaFiles & GENERATE_SERVICE_AND_MANAGER) != 0) {
+            type = MANAGER_SETTER_METHOD;
+        } else {
+            type = SETTER_METHOD;
+        }
+
+        return getJavaDoc(type, attributeName, attr.isListAttr(), pluginConfig)
+                + getSetterForInterface(attributeName, attrType, className, attr.isListAttr(), generatedJavaFiles);
+    }
+
+    /**
+     * Returns constructor method string.
+     *
+     * @param name class name
+     * @param pluginConfig plugin configurations
+     * @return constructor string
+     */
+    public static String getConstructorString(String name, YangPluginConfig pluginConfig) {
+        return getJavaDoc(CONSTRUCTOR, name, false, pluginConfig);
+    }
+
+    /**
+     * Returns default constructor method string.
+     *
+     * @param name class name
+     * @param modifierType modifier type
+     * @param pluginConfig plugin configurations
+     * @return default constructor string
+     */
+    public static String getDefaultConstructorString(String name, String modifierType,
+            YangPluginConfig pluginConfig) {
+        return getJavaDoc(DEFAULT_CONSTRUCTOR, name, false, pluginConfig)
+                + getDefaultConstructor(name, modifierType)
+                + NEW_LINE;
+    }
+
+    /**
+     * Returns check not null string.
+     *
+     * @param name attribute name
+     * @return check not null string
+     */
+    public static String getCheckNotNull(String name) {
+        return EIGHT_SPACE_INDENTATION + CHECK_NOT_NULL_STRING + OPEN_PARENTHESIS + name + COMMA + SPACE + name
+                + CLOSE_PARENTHESIS + SEMI_COLAN + NEW_LINE;
+    }
+
+    /**
+     * Returns build method string.
+     *
+     * @param name class name
+     * @return build string
+     */
+    public static String getBuildString(String name) {
+        return FOUR_SPACE_INDENTATION + OVERRIDE + NEW_LINE + getBuild(name);
+    }
+
+    /**
+     * Returns the getter method strings for class file.
+     *
+     * @param attr attribute info
+     * @param generatedJavaFiles for the type of java file being generated
+     * @return getter method for class
+     */
+    public static String getGetterForClass(JavaAttributeInfo attr, int generatedJavaFiles) {
+
+        String attrQuaifiedType = getReturnType(attr);
+        String attributeName = attr.getAttributeName();
+
+        if (!attr.isListAttr()) {
+            return getGetter(attrQuaifiedType, attributeName, generatedJavaFiles);
+        }
+        String listAttr = getListString() + attrQuaifiedType + DIAMOND_CLOSE_BRACKET;
+        return getGetter(listAttr, attributeName, generatedJavaFiles);
+    }
+
+    /**
+     * Returns getter for attribute.
+     *
+     * @param type return type
+     * @param name attribute name
+     * @param generatedJavaFiles generated java files
+     * @return getter for attribute
+     */
+    public static String getGetter(String type, String name, int generatedJavaFiles) {
+        String ret = parseTypeForReturnValue(type);
+        if ((generatedJavaFiles & GENERATE_SERVICE_AND_MANAGER) != 0) {
+            return FOUR_SPACE_INDENTATION + PUBLIC + SPACE + type + SPACE + GET_METHOD_PREFIX + getCapitalCase(name)
+                    + OPEN_PARENTHESIS + CLOSE_PARENTHESIS + SPACE + OPEN_CURLY_BRACKET + NEW_LINE +
+                    EIGHT_SPACE_INDENTATION + YANG_UTILS_TODO + NEW_LINE + EIGHT_SPACE_INDENTATION +
+                    RETURN + SPACE + ret + SEMI_COLAN + NEW_LINE + FOUR_SPACE_INDENTATION + CLOSE_CURLY_BRACKET;
+        } else {
+            return FOUR_SPACE_INDENTATION + PUBLIC + SPACE + type + SPACE + name
+                    + OPEN_PARENTHESIS + CLOSE_PARENTHESIS + SPACE + OPEN_CURLY_BRACKET + NEW_LINE +
+                    EIGHT_SPACE_INDENTATION + RETURN + SPACE + name + SEMI_COLAN + NEW_LINE + FOUR_SPACE_INDENTATION
+                    + CLOSE_CURLY_BRACKET;
+        }
+
+    }
+
+    /*Provides string to return for type.*/
+    private static String parseTypeForReturnValue(String type) {
+        switch (type) {
+        case BYTE:
+        case INT:
+        case SHORT:
+        case LONG:
+            return "0";
+        case BOOLEAN_DATA_TYPE:
+            return FALSE;
+        default:
+            return null;
+        }
+    }
+
+    /**
+     * Returns the setter method strings for class file.
+     *
+     * @param attr attribute info
+     * @param className name of the class
+     * @param generatedJavaFiles generated java files
+     * @return setter method for class
+     */
+    public static String getSetterForClass(JavaAttributeInfo attr, String className, int generatedJavaFiles) {
+
+        String attrQuaifiedType = getReturnType(attr);
+        String attributeName = attr.getAttributeName();
+        if (!attr.isListAttr()) {
+            return getSetter(className, attributeName, attrQuaifiedType, generatedJavaFiles);
+        }
+        String listAttr = getListString() + attrQuaifiedType + DIAMOND_CLOSE_BRACKET;
+        return getSetter(className, attributeName, listAttr, generatedJavaFiles);
+    }
+
+    /**
+     * Returns setter for attribute.
+     *
+     * @param className class name
+     * @param name attribute name
+     * @param type return type
+     * @return setter for attribute
+     */
+    private static String getSetter(String className, String name, String type, int generatedJavaFiles) {
+        if ((generatedJavaFiles & GENERATE_SERVICE_AND_MANAGER) != 0) {
+            return FOUR_SPACE_INDENTATION + PUBLIC + SPACE + VOID + SPACE + SET_METHOD_PREFIX
+                    + getCapitalCase(name) + OPEN_PARENTHESIS + type + SPACE + name + CLOSE_PARENTHESIS + SPACE +
+                    OPEN_CURLY_BRACKET + NEW_LINE + EIGHT_SPACE_INDENTATION + YANG_UTILS_TODO +
+                    NEW_LINE + FOUR_SPACE_INDENTATION + CLOSE_CURLY_BRACKET;
+        } else if (generatedJavaFiles == GENERATE_EVENT_SUBJECT_CLASS) {
+            return FOUR_SPACE_INDENTATION + PUBLIC + SPACE + VOID + SPACE + name + OPEN_PARENTHESIS + type + SPACE
+                    + name + CLOSE_PARENTHESIS + SPACE + OPEN_CURLY_BRACKET + NEW_LINE + EIGHT_SPACE_INDENTATION
+                    + THIS + PERIOD + name + SPACE + EQUAL + SPACE + name + SEMI_COLAN + NEW_LINE
+                    + FOUR_SPACE_INDENTATION + CLOSE_CURLY_BRACKET;
+        } else {
+            return FOUR_SPACE_INDENTATION + PUBLIC + SPACE + className + BUILDER + SPACE +
+                    name + OPEN_PARENTHESIS + type + SPACE + name + CLOSE_PARENTHESIS + SPACE
+                    + OPEN_CURLY_BRACKET + NEW_LINE + EIGHT_SPACE_INDENTATION + THIS + PERIOD + name + SPACE
+                    + EQUAL + SPACE + name + SEMI_COLAN + NEW_LINE + EIGHT_SPACE_INDENTATION + RETURN + SPACE
+                    + THIS + SEMI_COLAN + NEW_LINE + FOUR_SPACE_INDENTATION + CLOSE_CURLY_BRACKET;
+        }
+    }
+
+    /**
+     * Returns the setter method strings for class file.
+     *
+     * @param attr attribute info
+     * @return setter method for class
+     */
+    public static String getSetterForTypeDefClass(JavaAttributeInfo attr) {
+
+        String attrQuaifiedType = getReturnType(attr);
+        String attributeName = attr.getAttributeName();
+        return getTypeDefSetter(attrQuaifiedType, attributeName);
+    }
+
+    /**
+     * Returns type def's setter for attribute.
+     *
+     * @param type data type
+     * @param name attribute name
+     * @return setter for type def's attribute
+     */
+    private static String getTypeDefSetter(String type, String name) {
+        return FOUR_SPACE_INDENTATION + PUBLIC + SPACE + VOID + SPACE + SET_METHOD_PREFIX + getCapitalCase(name)
+                + OPEN_PARENTHESIS + type + SPACE + VALUE + CLOSE_PARENTHESIS + SPACE + OPEN_CURLY_BRACKET + NEW_LINE
+                + EIGHT_SPACE_INDENTATION + THIS + PERIOD + name + SPACE + EQUAL + SPACE + VALUE + SEMI_COLAN + NEW_LINE
+                + FOUR_SPACE_INDENTATION + CLOSE_CURLY_BRACKET;
+    }
+
+    /**
+     * Returns override string.
+     *
+     * @return override string
+     */
+    public static String getOverRideString() {
+        return NEW_LINE + FOUR_SPACE_INDENTATION + OVERRIDE + NEW_LINE;
+    }
+
+    /**
+     * Returns the getter method strings for interface file.
+     *
+     * @param yangName name of the attribute
+     * @param returnType return type of attribute
+     * @param isList is list attribute
+     * @param generatedJavaFiles generated java files
+     * @return getter method for interface
+     */
+    public static String getGetterForInterface(String yangName, String returnType, boolean isList,
+            int generatedJavaFiles) {
+
+        if (!isList) {
+            return getGetterInterfaceString(returnType, yangName, generatedJavaFiles);
+        }
+        String listAttr = getListString() + returnType + DIAMOND_CLOSE_BRACKET;
+        return getGetterInterfaceString(listAttr, yangName, generatedJavaFiles);
+    }
+
+    /**
+     * Returns getter for attribute in interface.
+     *
+     * @param returnType return type
+     * @param yangName attribute name
+     * @return getter for interface
+     */
+    private static String getGetterInterfaceString(String returnType, String yangName,
+            int generatedJavaFiles) {
+        if ((generatedJavaFiles & GENERATE_SERVICE_AND_MANAGER) != 0) {
+            return FOUR_SPACE_INDENTATION + returnType + SPACE + GET_METHOD_PREFIX + getCapitalCase(yangName)
+                    + OPEN_PARENTHESIS + CLOSE_PARENTHESIS + SEMI_COLAN;
+        } else {
+            return FOUR_SPACE_INDENTATION + returnType + SPACE + yangName
+                    + OPEN_PARENTHESIS + CLOSE_PARENTHESIS + SEMI_COLAN;
+        }
+    }
+
+    /**
+     * Returns the setter method strings for interface file.
+     *
+     * @param attrName name of the attribute
+     * @param attrType return type of attribute
+     * @param className name of the java class being generated
+     * @param isList is list attribute
+     * @param generatedJavaFiles generated java files
+     * @return setter method for interface
+     */
+    public static String getSetterForInterface(String attrName, String attrType, String className,
+            boolean isList, int generatedJavaFiles) {
+
+        if (!isList) {
+            return getSetterInterfaceString(className, attrName, attrType, generatedJavaFiles);
+        }
+        String listAttr = getListString() + attrType + DIAMOND_CLOSE_BRACKET;
+        return getSetterInterfaceString(className, attrName, listAttr, generatedJavaFiles);
+    }
+
+    /**
+     * Returns setter string for interface.
+     *
+     * @param className class name
+     * @param attrName attribute name
+     * @param attrType attribute type
+     * @return setter string
+     */
+    private static String getSetterInterfaceString(String className, String attrName, String attrType,
+            int generatedJavaFiles) {
+        if ((generatedJavaFiles & GENERATE_SERVICE_AND_MANAGER) != 0) {
+
+            return FOUR_SPACE_INDENTATION + VOID + SPACE + SET_METHOD_PREFIX + getCapitalCase(attrName)
+                    + OPEN_PARENTHESIS + attrType + SPACE + attrName + CLOSE_PARENTHESIS + SEMI_COLAN;
+        } else {
+            return FOUR_SPACE_INDENTATION + className + BUILDER + SPACE + attrName
+                    + OPEN_PARENTHESIS + attrType + SPACE + attrName + CLOSE_PARENTHESIS + SEMI_COLAN;
+        }
+    }
+
+    /**
+     * Returns list string.
+     *
+     * @return list string
+     */
+    private static String getListString() {
+        return LIST + DIAMOND_OPEN_BRACKET;
+    }
+
+    /**
+     * Returns return type for attribute.
+     *
+     * @param attr attribute info
+     * @return return type
+     */
+    private static String getReturnType(JavaAttributeInfo attr) {
+
+        String returnType = EMPTY_STRING;
+        if (attr.isQualifiedName() && attr.getImportInfo().getPkgInfo() != null) {
+            returnType = attr.getImportInfo().getPkgInfo() + PERIOD;
+        }
+        returnType = returnType + attr.getImportInfo().getClassInfo();
+        return returnType;
+    }
+
+    /**
+     * Returns the build method strings for interface file.
+     *
+     * @param yangName name of the interface
+     * @return build method for interface
+     */
+    public static String getBuildForInterface(String yangName) {
+        return FOUR_SPACE_INDENTATION + yangName + SPACE + BUILD + OPEN_PARENTHESIS + CLOSE_PARENTHESIS + SEMI_COLAN
+                + NEW_LINE;
+    }
+
+    /**
+     * Returns constructor string for impl class.
+     *
+     * @param yangName class name
+     * @param pluginConfig plugin configurations
+     * @return constructor string
+     */
+    public static String getConstructorStart(String yangName, YangPluginConfig pluginConfig) {
+
+        String javadoc = getConstructorString(yangName, pluginConfig);
+        String constructor =
+                FOUR_SPACE_INDENTATION + PUBLIC + SPACE + yangName + IMPL + OPEN_PARENTHESIS + yangName
+                        + BUILDER + SPACE + BUILDER.toLowerCase() + OBJECT + CLOSE_PARENTHESIS + SPACE
+                        + OPEN_CURLY_BRACKET
+                        + NEW_LINE;
+        return javadoc + constructor;
+    }
+
+    /**
+     * Returns the constructor strings for class file.
+     *
+     * @param yangName name of the class
+     * @param attr attribute info
+     * @param generatedJavaFiles generated java files
+     * @param pluginConfig plugin configurations
+     * @return constructor for class
+     */
+    public static String getConstructor(String yangName, JavaAttributeInfo attr, int generatedJavaFiles,
+            YangPluginConfig pluginConfig) {
+
+        String attributeName = attr.getAttributeName();
+        String constructor;
+
+        if ((generatedJavaFiles & GENERATE_SERVICE_AND_MANAGER) != 0) {
+            constructor =
+                    EIGHT_SPACE_INDENTATION + THIS + PERIOD
+                            + getCamelCase(attributeName, pluginConfig.getConflictResolver()) + SPACE + EQUAL
+                            + SPACE + BUILDER.toLowerCase() + OBJECT + PERIOD + GET_METHOD_PREFIX
+                            + getCapitalCase(getCamelCase(attributeName, pluginConfig.getConflictResolver()))
+                            + OPEN_PARENTHESIS + CLOSE_PARENTHESIS + SEMI_COLAN + NEW_LINE;
+        } else {
+            constructor =
+                    EIGHT_SPACE_INDENTATION + THIS + PERIOD
+                            + getCamelCase(attributeName, pluginConfig.getConflictResolver()) + SPACE + EQUAL
+                            + SPACE + BUILDER.toLowerCase() + OBJECT + PERIOD
+                            + getCamelCase(attributeName, pluginConfig.getConflictResolver()) +
+                            OPEN_PARENTHESIS + CLOSE_PARENTHESIS + SEMI_COLAN + NEW_LINE;
+        }
+        return constructor;
+    }
+
+    /**
+     * Returns the rpc strings for service interface.
+     *
+     * @param rpcName name of the rpc
+     * @param inputName name of input
+     * @param outputName name of output
+     * @param pluginConfig plugin configurations
+     * @return rpc method string
+     */
+    public static String getRpcServiceMethod(String rpcName, String inputName, String outputName,
+            YangPluginConfig pluginConfig) {
+
+        rpcName = getCamelCase(rpcName, pluginConfig.getConflictResolver());
+        if (!inputName.equals(EMPTY_STRING)) {
+            inputName = inputName + SPACE + RPC_INPUT_VAR_NAME;
+        }
+        return FOUR_SPACE_INDENTATION + outputName + SPACE + rpcName + OPEN_PARENTHESIS + inputName
+                + CLOSE_PARENTHESIS + SEMI_COLAN;
+    }
+
+    /**
+     * Returns the rpc strings for manager impl.
+     *
+     * @param rpcName name of the rpc
+     * @param inputName name of input
+     * @param outputName name of output
+     * @param pluginConfig plugin configurations
+     * @return rpc method string
+     */
+    public static String getRpcManagerMethod(String rpcName, String inputName, String outputName,
+            YangPluginConfig pluginConfig) {
+
+        rpcName = getCamelCase(rpcName, pluginConfig.getConflictResolver());
+        if (!inputName.equals(EMPTY_STRING)) {
+            inputName = inputName + SPACE + RPC_INPUT_VAR_NAME;
+        }
+
+        String method =
+                getOverRideString() + FOUR_SPACE_INDENTATION + PUBLIC + SPACE + outputName + SPACE + rpcName
+                        + OPEN_PARENTHESIS + inputName + CLOSE_PARENTHESIS + SPACE
+                        + OPEN_CURLY_BRACKET + NEW_LINE + EIGHT_SPACE_INDENTATION + YANG_UTILS_TODO + NEW_LINE;
+        if (!outputName.contentEquals(VOID)) {
+            method += EIGHT_SPACE_INDENTATION + RETURN + SPACE + parseTypeForReturnValue(outputName) + SEMI_COLAN
+                    + NEW_LINE;
+        }
+        method += FOUR_SPACE_INDENTATION + CLOSE_CURLY_BRACKET;
+
+        return method;
+    }
+
+    /**
+     * Returns the build method strings for class file.
+     *
+     * @param yangName class name
+     * @return build method string for class
+     */
+    public static String getBuild(String yangName) {
+        return FOUR_SPACE_INDENTATION + PUBLIC + SPACE + yangName + SPACE + BUILD + OPEN_PARENTHESIS + CLOSE_PARENTHESIS
+                + SPACE + OPEN_CURLY_BRACKET + NEW_LINE + EIGHT_SPACE_INDENTATION + RETURN + SPACE + NEW + SPACE
+                + yangName + IMPL + OPEN_PARENTHESIS + THIS + CLOSE_PARENTHESIS + SEMI_COLAN + NEW_LINE
+                + FOUR_SPACE_INDENTATION + CLOSE_CURLY_BRACKET;
+    }
+
+    /**
+     * Returns the Default constructor strings for class file.
+     *
+     * @param name name of the class
+     * @param modifierType modifier type for default constructor
+     * @return Default constructor for class
+     */
+    private static String getDefaultConstructor(String name, String modifierType) {
+        return FOUR_SPACE_INDENTATION + modifierType + SPACE + name + OPEN_PARENTHESIS + CLOSE_PARENTHESIS + SPACE
+                + OPEN_CURLY_BRACKET + NEW_LINE + FOUR_SPACE_INDENTATION + CLOSE_CURLY_BRACKET;
+    }
+
+    /**
+     * Returns to string method's open strings.
+     *
+     * @return string method's open string
+     */
+    public static String getToStringMethodOpen() {
+        return getOverRideString() + FOUR_SPACE_INDENTATION + PUBLIC + SPACE + STRING_DATA_TYPE + SPACE + TO
+                + STRING_DATA_TYPE + OPEN_PARENTHESIS + CLOSE_PARENTHESIS + SPACE + OPEN_CURLY_BRACKET + NEW_LINE
+                + EIGHT_SPACE_INDENTATION + RETURN + GOOGLE_MORE_OBJECT_METHOD_STRING + NEW_LINE;
+    }
+
+    /**
+     * Returns omit null value string.
+     *
+     * @return omit null value string
+     */
+    public static String getOmitNullValueString() {
+        return TWELVE_SPACE_INDENTATION + PERIOD + OMIT_NULL_VALUE_STRING + NEW_LINE;
+    }
+
+    /**
+     * Returns to string method's close string.
+     *
+     * @return to string method close string
+     */
+    public static String getToStringMethodClose() {
+        return TWELVE_SPACE_INDENTATION + PERIOD + TO + STRING_DATA_TYPE + OPEN_PARENTHESIS + CLOSE_PARENTHESIS
+                + SEMI_COLAN + NEW_LINE + FOUR_SPACE_INDENTATION + CLOSE_CURLY_BRACKET + NEW_LINE;
+    }
+
+    /**
+     * Returns to string method for class.
+     *
+     * @param attr attribute info
+     * @return to string method
+     */
+    public static String getToStringMethod(JavaAttributeInfo attr) {
+
+        String attributeName = attr.getAttributeName();
+        return TWELVE_SPACE_INDENTATION + PERIOD + ADD_STRING + OPEN_PARENTHESIS + QUOTES + attributeName + QUOTES
+                + COMMA + SPACE + attributeName + CLOSE_PARENTHESIS;
+    }
+
+    /**
+     * Returns from string method's open string.
+     *
+     * @param className name of the class
+     * @param pluginConfig plugin configurations
+     * @return from string method's open string
+     */
+    public static String getFromStringMethodSignature(String className, YangPluginConfig pluginConfig) {
+        return getJavaDoc(FROM_METHOD, className, false, pluginConfig) + FOUR_SPACE_INDENTATION + PUBLIC + SPACE
+                + STATIC + SPACE + className + SPACE + FROM_STRING_METHOD_NAME + OPEN_PARENTHESIS
+                + STRING_DATA_TYPE + SPACE + FROM_STRING_PARAM_NAME + CLOSE_PARENTHESIS + SPACE
+                + OPEN_CURLY_BRACKET + NEW_LINE;
+    }
+
+    /**
+     * Return from string method's close string.
+     *
+     * @return from string method's close string
+     */
+    public static String getFromStringMethodClose() {
+        return EIGHT_SPACE_INDENTATION + RETURN + SPACE + NULL + SEMI_COLAN + NEW_LINE + FOUR_SPACE_INDENTATION +
+                CLOSE_CURLY_BRACKET + NEW_LINE;
+    }
+
+    /**
+     * Return from string method's body string.
+     *
+     * @param attr attribute info
+     * @param fromStringAttributeInfo attribute info for the from string
+     * wrapper type
+     * @return from string method's body string
+     */
+    public static String getFromStringMethod(JavaAttributeInfo attr,
+            JavaAttributeInfo fromStringAttributeInfo) {
+
+        return EIGHT_SPACE_INDENTATION + getTrySubString() + NEW_LINE + TWELVE_SPACE_INDENTATION
+                + getParsedSubString(attr, fromStringAttributeInfo) + SEMI_COLAN + NEW_LINE + TWELVE_SPACE_INDENTATION
+                + getReturnOfSubString() + NEW_LINE + EIGHT_SPACE_INDENTATION + getCatchSubString()
+                + NEW_LINE + EIGHT_SPACE_INDENTATION + CLOSE_CURLY_BRACKET;
+    }
+
+    /**
+     * Returns sub string with try statement for union's from string method.
+     *
+     * @return sub string with try statement for union's from string method
+     */
+    public static String getTrySubString() {
+        return TRY + SPACE + OPEN_CURLY_BRACKET;
+    }
+
+    /**
+     * Returns sub string with return statement for union's from string method.
+     *
+     * @return sub string with return statement for union's from string method
+     */
+    public static String getReturnOfSubString() {
+        return RETURN + SPACE + OF + OPEN_PARENTHESIS + TMP_VAL + CLOSE_PARENTHESIS + SEMI_COLAN;
+    }
+
+    /**
+     * Returns sub string with catch statement for union's from string method.
+     *
+     * @return sub string with catch statement for union's from string method
+     */
+    public static String getCatchSubString() {
+        return CLOSE_CURLY_BRACKET + SPACE + CATCH + SPACE + OPEN_PARENTHESIS + EXCEPTION + SPACE + EXCEPTION_VAR
+                + CLOSE_PARENTHESIS + SPACE + OPEN_CURLY_BRACKET;
+    }
+
+    /**
+     * Returns sub string with parsed statement for union's from string method.
+     *
+     * @param attr attribute info
+     * @return sub string with parsed statement for union's from string method
+     */
+    private static String getParsedSubString(JavaAttributeInfo attr,
+            JavaAttributeInfo fromStringAttributeInfo) {
+
+        String targetDataType = getReturnType(attr);
+        String parseFromStringMethod = getParseFromStringMethod(targetDataType,
+                fromStringAttributeInfo.getAttributeType());
+        return targetDataType + SPACE + TMP_VAL + SPACE + EQUAL + SPACE + parseFromStringMethod
+                + OPEN_PARENTHESIS + FROM_STRING_PARAM_NAME + CLOSE_PARENTHESIS;
+    }
+
+    /**
+     * Returns hash code method open strings.
+     *
+     * @return hash code method open string
+     */
+    public static String getHashCodeMethodOpen() {
+        return getOverRideString() + FOUR_SPACE_INDENTATION + PUBLIC + SPACE + INT + SPACE + HASH_CODE_STRING
+                + OPEN_PARENTHESIS + CLOSE_PARENTHESIS + SPACE + OPEN_CURLY_BRACKET + NEW_LINE + EIGHT_SPACE_INDENTATION
+                + RETURN + SPACE + OBJECT_STRING + SUFFIX_S + PERIOD + HASH + OPEN_PARENTHESIS;
+    }
+
+    /**
+     * Returns hash code methods close string.
+     *
+     * @param hashcodeString hash code string
+     * @return to hash code method close string
+     */
+    public static String getHashCodeMethodClose(String hashcodeString) {
+        hashcodeString = trimAtLast(hashcodeString, COMMA);
+        hashcodeString = trimAtLast(hashcodeString, SPACE);
+        return hashcodeString + CLOSE_PARENTHESIS + SEMI_COLAN + NEW_LINE + FOUR_SPACE_INDENTATION + CLOSE_CURLY_BRACKET
+                + NEW_LINE;
+    }
+
+    /**
+     * Returns hash code method for class.
+     *
+     * @param attr attribute info
+     * @return hash code method
+     */
+    public static String getHashCodeMethod(JavaAttributeInfo attr) {
+        return attr.getAttributeName() + COMMA + SPACE;
+    }
+
+    /**
+     * Returns equals method open strings.
+     *
+     * @param className class name
+     * @return equals method open string
+     */
+    public static String getEqualsMethodOpen(String className) {
+        return getOverRideString() + FOUR_SPACE_INDENTATION + PUBLIC + SPACE + BOOLEAN_DATA_TYPE + SPACE + EQUALS_STRING
+                + OPEN_PARENTHESIS + OBJECT_STRING + SPACE + OBJ + CLOSE_PARENTHESIS + SPACE + OPEN_CURLY_BRACKET
+                + NEW_LINE + getEqualsMethodsCommonIfCondition() + getEqualsMethodsSpecificIfCondition(className);
+    }
+
+    /**
+     * Returns equal methods if condition string.
+     *
+     * @return if condition string
+     */
+    private static String getEqualsMethodsCommonIfCondition() {
+        return EIGHT_SPACE_INDENTATION + IF + SPACE + OPEN_PARENTHESIS + THIS + SPACE + EQUAL + EQUAL + SPACE + OBJ
+                + CLOSE_PARENTHESIS + SPACE + OPEN_CURLY_BRACKET + NEW_LINE + TWELVE_SPACE_INDENTATION + RETURN + SPACE
+                + TRUE + SEMI_COLAN + NEW_LINE + EIGHT_SPACE_INDENTATION + CLOSE_CURLY_BRACKET + NEW_LINE;
+    }
+
+    /**
+     * Returns if condition for specific class object in equals method.
+     *
+     * @param className class name
+     * @return if condition string
+     */
+    private static String getEqualsMethodsSpecificIfCondition(String className) {
+        return EIGHT_SPACE_INDENTATION + IF + SPACE + OPEN_PARENTHESIS + OBJ + INSTANCE_OF + className
+                + CLOSE_PARENTHESIS + SPACE + OPEN_CURLY_BRACKET + NEW_LINE + TWELVE_SPACE_INDENTATION + className
+                + SPACE + OTHER + SPACE + EQUAL + SPACE + OPEN_PARENTHESIS + className + CLOSE_PARENTHESIS + SPACE
+                + OBJ + SEMI_COLAN + NEW_LINE + TWELVE_SPACE_INDENTATION + RETURN + NEW_LINE;
+    }
+
+    /**
+     * Returns equals methods close string.
+     *
+     * @param equalMethodString equal method string
+     * @return equals method close string
+     */
+    public static String getEqualsMethodClose(String equalMethodString) {
+        equalMethodString = trimAtLast(equalMethodString, AND);
+        equalMethodString = trimAtLast(equalMethodString, AND);
+        equalMethodString = trimAtLast(equalMethodString, SPACE);
+        equalMethodString = trimAtLast(equalMethodString, NEW_LINE) + SEMI_COLAN + NEW_LINE;
+        return equalMethodString + EIGHT_SPACE_INDENTATION + CLOSE_CURLY_BRACKET + NEW_LINE + EIGHT_SPACE_INDENTATION
+                + RETURN + SPACE + FALSE + SEMI_COLAN + NEW_LINE + FOUR_SPACE_INDENTATION + CLOSE_CURLY_BRACKET
+                + NEW_LINE;
+    }
+
+    /**
+     * Returns equals method for class.
+     *
+     * @param attr attribute info
+     * @return equals method
+     */
+    public static String getEqualsMethod(JavaAttributeInfo attr) {
+
+        String attributeName = attr.getAttributeName();
+        return SIXTEEN_SPACE_INDENTATION + SPACE + OBJECT_STRING + SUFFIX_S + PERIOD + EQUALS_STRING + OPEN_PARENTHESIS
+                + attributeName + COMMA + SPACE + OTHER + PERIOD + attributeName + CLOSE_PARENTHESIS + SPACE + AND
+                + AND;
+    }
+
+    /**
+     * Returns of method string for class.
+     *
+     * @param name class name
+     * @param attr attribute info
+     * @return of method string
+     */
+    public static String getOfMethod(String name, JavaAttributeInfo attr) {
+
+        String attrQualifiedType = getReturnType(attr);
+
+        return FOUR_SPACE_INDENTATION + PUBLIC + SPACE + STATIC + SPACE + name + SPACE + OF + OPEN_PARENTHESIS
+                + attrQualifiedType + SPACE + VALUE + CLOSE_PARENTHESIS + SPACE + OPEN_CURLY_BRACKET + NEW_LINE
+                + EIGHT_SPACE_INDENTATION + RETURN + SPACE + NEW + SPACE + name + OPEN_PARENTHESIS + VALUE
+                + CLOSE_PARENTHESIS + SEMI_COLAN + NEW_LINE + FOUR_SPACE_INDENTATION + CLOSE_CURLY_BRACKET + NEW_LINE;
+    }
+
+    /**
+     * Returns of method's string and java doc for special type.
+     *
+     * @param attr attribute info
+     * @param generatedJavaClassName class name
+     * @param pluginConfig plugin configurations
+     * @return of method's string and java doc for special type
+     */
+    public static String getOfMethodStringAndJavaDoc(JavaAttributeInfo attr, String generatedJavaClassName,
+            YangPluginConfig pluginConfig) {
+
+        String attrType = getReturnType(attr);
+        String attrName = attr.getAttributeName();
+
+        return getJavaDoc(OF_METHOD, generatedJavaClassName + " for type " + attrName, false, pluginConfig)
+                + getOfMethodString(attrType, generatedJavaClassName);
+    }
+
+    /**
+     * Returns of method's string.
+     *
+     * @param type data type
+     * @param className class name
+     * @return of method's string
+     */
+    private static String getOfMethodString(String type, String className) {
+
+        return FOUR_SPACE_INDENTATION + PUBLIC + SPACE + STATIC + SPACE + className + SPACE + OF + OPEN_PARENTHESIS
+                + type + SPACE + VALUE + CLOSE_PARENTHESIS + SPACE + OPEN_CURLY_BRACKET + NEW_LINE
+                + EIGHT_SPACE_INDENTATION + RETURN + SPACE + NEW + SPACE + className + OPEN_PARENTHESIS + VALUE
+                + CLOSE_PARENTHESIS + SEMI_COLAN + NEW_LINE + FOUR_SPACE_INDENTATION + CLOSE_CURLY_BRACKET;
+    }
+
+    /**
+     * Returns string and java doc for constructor of type class.
+     *
+     * @param attr attribute info
+     * @param generatedJavaClassName class name
+     * @param pluginConfig plugin configurations
+     * @return string and java doc for constructor of type class
+     */
+    public static String getTypeConstructorStringAndJavaDoc(JavaAttributeInfo attr,
+            String generatedJavaClassName, YangPluginConfig pluginConfig) {
+
+        String attrType = getReturnType(attr);
+        String attrName = attr.getAttributeName();
+
+        return getJavaDoc(TYPE_CONSTRUCTOR, generatedJavaClassName + " for type " + attrName, false, pluginConfig)
+                + getTypeConstructorString(attrType, attrName, generatedJavaClassName);
+    }
+
+    /**
+     * Returns type constructor string.
+     *
+     * @param type data type
+     * @param name attribute name
+     * @param className class name
+     * @return type constructor string
+     */
+    private static String getTypeConstructorString(String type, String name, String className) {
+
+        return FOUR_SPACE_INDENTATION + PUBLIC + SPACE + className + OPEN_PARENTHESIS + type + SPACE + VALUE
+                + CLOSE_PARENTHESIS + SPACE + OPEN_CURLY_BRACKET + NEW_LINE + EIGHT_SPACE_INDENTATION + THIS + PERIOD
+                + name + SPACE + EQUAL + SPACE + VALUE + SEMI_COLAN + NEW_LINE + FOUR_SPACE_INDENTATION
+                + CLOSE_CURLY_BRACKET;
+    }
+
+    /**
+     * Returns implementation of add augmentation method of AugmentationHolder class.
+     *
+     * @return implementation of add augmentation method of AugmentationHolder class
+     */
+    public static String getAddAugmentInfoMethodImpl() {
+        String method = FOUR_SPACE_INDENTATION;
+        method = method + getOverRideString() + FOUR_SPACE_INDENTATION + PUBLIC + SPACE + VOID + SPACE + ADD_STRING
+                + AUGMENTATION + OPEN_PARENTHESIS + AUGMENTED_INFO + SPACE + VALUE + CLOSE_PARENTHESIS + SPACE
+                + OPEN_CURLY_BRACKET + NEW_LINE + EIGHT_SPACE_INDENTATION + GET_METHOD_PREFIX + AUGMENTED_INFO + LIST
+                + OPEN_PARENTHESIS + CLOSE_PARENTHESIS + PERIOD + ADD_STRING + OPEN_PARENTHESIS + VALUE
+                + CLOSE_PARENTHESIS + SEMI_COLAN + NEW_LINE + FOUR_SPACE_INDENTATION + CLOSE_CURLY_BRACKET;
+
+        return method;
+    }
+
+    /**
+     * Returns implementation of get augment info list method of AugmentationHolder class.
+     *
+     * @return implementation of get augment info list method of AugmentationHolder class
+     */
+    public static String getAugmentInfoListImpl() {
+
+        String method = FOUR_SPACE_INDENTATION;
+        method = method + getOverRideString() + FOUR_SPACE_INDENTATION + PUBLIC + SPACE + LIST + DIAMOND_OPEN_BRACKET
+                + AUGMENTED_INFO + DIAMOND_CLOSE_BRACKET + SPACE + GET_METHOD_PREFIX + AUGMENTED_INFO + LIST
+                + OPEN_PARENTHESIS + CLOSE_PARENTHESIS + SPACE + OPEN_CURLY_BRACKET + NEW_LINE + EIGHT_SPACE_INDENTATION
+                + RETURN + SPACE + getSmallCase(AUGMENTED_INFO) + LIST + SEMI_COLAN + NEW_LINE + FOUR_SPACE_INDENTATION
+                + CLOSE_CURLY_BRACKET;
+        return method;
+    }
+
+    /**
+     * Returns implementation of remove augmentation method of AugmentationHolder class.
+     *
+     * @return implementation of remove augmentation method of AugmentationHolder class
+     */
+    public static String getRemoveAugmentationImpl() {
+        String method = FOUR_SPACE_INDENTATION;
+        method = method + getOverRideString() + FOUR_SPACE_INDENTATION + PUBLIC + SPACE + VOID + SPACE + "remove"
+                + AUGMENTATION + OPEN_PARENTHESIS + CLOSE_PARENTHESIS + SPACE + OPEN_CURLY_BRACKET + NEW_LINE
+                + EIGHT_SPACE_INDENTATION + GET_METHOD_PREFIX + AUGMENTED_INFO + LIST + OPEN_PARENTHESIS
+                + CLOSE_PARENTHESIS + PERIOD + CLEAR + OPEN_PARENTHESIS + CLOSE_PARENTHESIS + SEMI_COLAN + NEW_LINE
+                + FOUR_SPACE_INDENTATION + CLOSE_CURLY_BRACKET;
+        return method;
+    }
+
+    /**
+     * Returns enum's constructor.
+     *
+     * @param className enum's class name
+     * @return enum's constructor
+     */
+    public static String getEnumsConstrcutor(String className) {
+        return FOUR_SPACE_INDENTATION + className + OPEN_PARENTHESIS + INT + SPACE + VALUE + CLOSE_PARENTHESIS + SPACE
+                + OPEN_CURLY_BRACKET + NEW_LINE + EIGHT_SPACE_INDENTATION + getSmallCase(className) + SPACE + EQUAL
+                + SPACE + VALUE + SEMI_COLAN + NEW_LINE + FOUR_SPACE_INDENTATION + CLOSE_CURLY_BRACKET;
+    }
+
+    /**
+     * Provides string to be added in augment node's constructor.
+     *
+     * @param curNode current YANG node
+     * @return constructors string
+     */
+    public static String getAugmentsAddToAugmentedMethod(YangNode curNode) {
+
+        if (!(curNode instanceof YangJavaAugment)) {
+            throw new TranslatorException("current node should be of type augment node.");
+        }
+        YangJavaAugment augment = (YangJavaAugment) curNode;
+        List<YangNodeIdentifier> targetNodes = augment.getTargetNode();
+
+        String name = targetNodes.get(targetNodes.size() - 1).getName();
+        String captialCase = getCapitalCase(name);
+        String smallCase = getSmallCase(captialCase);
+        return EIGHT_SPACE_INDENTATION + captialCase + IMPL + SPACE + smallCase + IMPL + SPACE + EQUAL + SPACE
+                + NEW + SPACE + captialCase + BUILDER + OPEN_PARENTHESIS + CLOSE_PARENTHESIS + PERIOD + NEW + SPACE
+                + captialCase + IMPL + OPEN_PARENTHESIS + CLOSE_PARENTHESIS + SEMI_COLAN + NEW_LINE
+                + EIGHT_SPACE_INDENTATION + smallCase + IMPL + PERIOD + ADD_STRING + AUGMENTATION
+                + OPEN_PARENTHESIS + THIS + CLOSE_PARENTHESIS + SEMI_COLAN + NEW_LINE;
+
+    }
+
+    private static String getAugmentsAddToAugmentedMethodStart() {
+        return FOUR_SPACE_INDENTATION + PUBLIC + SPACE + VOID + SPACE + ADD_STRING + AUGMENTABLE + OPEN_PARENTHESIS
+                + CLOSE_PARENTHESIS + SPACE + OPEN_CURLY_BRACKET;
+    }
+
+    /**
+     * Returns of method for enum class.
+     *
+     * @param className class name
+     * @param attr java attribute
+     * @param enumMap enum's sets map
+     * @param enumList enum's sets list
+     * @param pluginConfig plugin configurations
+     * @return of method
+     */
+    public static String getEnumsOfMethod(String className, JavaAttributeInfo attr,
+            Map<String, Integer> enumMap, List<String> enumList, YangPluginConfig pluginConfig) {
+        String attrType = getReturnType(attr);
+        String attrName = attr.getAttributeName();
+
+        String method = FOUR_SPACE_INDENTATION + PUBLIC + SPACE + STATIC + SPACE + getCapitalCase(className) + SPACE
+                + OF + OPEN_PARENTHESIS
+                + attrType + SPACE + VALUE + CLOSE_PARENTHESIS + SPACE + OPEN_CURLY_BRACKET + NEW_LINE
+                + EIGHT_SPACE_INDENTATION + SWITCH + SPACE + OPEN_PARENTHESIS + VALUE
+                + CLOSE_PARENTHESIS + SPACE + OPEN_CURLY_BRACKET + NEW_LINE;
+        int value = 0;
+        for (String str : enumList) {
+
+            value = enumMap.get(str);
+            method = method + TWELVE_SPACE_INDENTATION + CASE + SPACE + value + COLAN + NEW_LINE
+                    + SIXTEEN_SPACE_INDENTATION + RETURN + SPACE + getCapitalCase(className) + PERIOD
+                    + str + SEMI_COLAN + NEW_LINE;
+        }
+        method = method + TWELVE_SPACE_INDENTATION + DEFAULT + SPACE + COLAN + NEW_LINE + SIXTEEN_SPACE_INDENTATION
+                + RETURN + SPACE + NULL + SEMI_COLAN + NEW_LINE + EIGHT_SPACE_INDENTATION + CLOSE_CURLY_BRACKET
+                + NEW_LINE + FOUR_SPACE_INDENTATION + CLOSE_CURLY_BRACKET;
+
+        return getJavaDoc(OF_METHOD, getCapitalCase(className) + " for type " + attrName, false, pluginConfig)
+                + method;
+    }
+
+    /**
+     * Returns activate method string.
+     *
+     * @return activate method string
+     */
+    public static String addActivateMethod() {
+        return FOUR_SPACE_INDENTATION + ACTIVATE_ANNOTATION + FOUR_SPACE_INDENTATION
+                + PUBLIC + SPACE + VOID + SPACE + ACTIVATE + OPEN_PARENTHESIS
+                + CLOSE_PARENTHESIS + SPACE + OPEN_CURLY_BRACKET
+                + NEW_LINE + EIGHT_SPACE_INDENTATION
+                + YANG_UTILS_TODO
+                + NEW_LINE + EIGHT_SPACE_INDENTATION
+                + STARTED_LOG_INFO + FOUR_SPACE_INDENTATION
+                + CLOSE_CURLY_BRACKET + NEW_LINE;
+    }
+
+    /**
+     * Returns deactivate method string.
+     *
+     * @return deactivate method string
+     */
+    public static String addDeActivateMethod() {
+        return NEW_LINE + FOUR_SPACE_INDENTATION + DEACTIVATE_ANNOTATION + FOUR_SPACE_INDENTATION
+                + PUBLIC + SPACE + VOID + SPACE + DEACTIVATE + OPEN_PARENTHESIS
+                + CLOSE_PARENTHESIS + SPACE + OPEN_CURLY_BRACKET + NEW_LINE + EIGHT_SPACE_INDENTATION
+                + YANG_UTILS_TODO + NEW_LINE + EIGHT_SPACE_INDENTATION
+                + STOPPED_LOG_INFO + FOUR_SPACE_INDENTATION + CLOSE_CURLY_BRACKET + NEW_LINE;
+    }
+
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/utils/TempJavaCodeFragmentFilesUtils.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/utils/TempJavaCodeFragmentFilesUtils.java
new file mode 100644
index 0000000..f70ec53
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/utils/TempJavaCodeFragmentFilesUtils.java
@@ -0,0 +1,349 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.translator.tojava.utils;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.List;
+
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangNodeIdentifier;
+import org.onosproject.yangutils.translator.exception.TranslatorException;
+import org.onosproject.yangutils.translator.tojava.JavaFileInfoContainer;
+import org.onosproject.yangutils.translator.tojava.JavaQualifiedTypeInfo;
+import org.onosproject.yangutils.translator.tojava.TempJavaCodeFragmentFiles;
+import org.onosproject.yangutils.translator.tojava.TempJavaCodeFragmentFilesContainer;
+import org.onosproject.yangutils.translator.tojava.TempJavaFragmentFiles;
+import org.onosproject.yangutils.translator.tojava.javamodel.YangJavaAugment;
+import org.onosproject.yangutils.translator.tojava.javamodel.YangJavaModule;
+
+import static org.onosproject.yangutils.translator.tojava.utils.JavaIdentifierSyntax.getCapitalCase;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaIdentifierSyntax.getSmallCase;
+import static org.onosproject.yangutils.utils.UtilConstants.ACTIVATE_ANNOTATION_IMPORT;
+import static org.onosproject.yangutils.utils.UtilConstants.ADD_STRING;
+import static org.onosproject.yangutils.utils.UtilConstants.AUGMENTATION;
+import static org.onosproject.yangutils.utils.UtilConstants.AUGMENTATION_HOLDER;
+import static org.onosproject.yangutils.utils.UtilConstants.AUGMENTED_INFO;
+import static org.onosproject.yangutils.utils.UtilConstants.BUILDER;
+import static org.onosproject.yangutils.utils.UtilConstants.CLOSE_PARENTHESIS;
+import static org.onosproject.yangutils.utils.UtilConstants.COMPONENT_ANNOTATION_IMPORT;
+import static org.onosproject.yangutils.utils.UtilConstants.DEACTIVATE_ANNOTATION_IMPORT;
+import static org.onosproject.yangutils.utils.UtilConstants.EIGHT_SPACE_INDENTATION;
+import static org.onosproject.yangutils.utils.UtilConstants.ENUM;
+import static org.onosproject.yangutils.utils.UtilConstants.EQUAL;
+import static org.onosproject.yangutils.utils.UtilConstants.FOUR_SPACE_INDENTATION;
+import static org.onosproject.yangutils.utils.UtilConstants.IMPL;
+import static org.onosproject.yangutils.utils.UtilConstants.IMPORT;
+import static org.onosproject.yangutils.utils.UtilConstants.LISTENER_SERVICE;
+import static org.onosproject.yangutils.utils.UtilConstants.LOGGER_FACTORY_IMPORT;
+import static org.onosproject.yangutils.utils.UtilConstants.LOGGER_IMPORT;
+import static org.onosproject.yangutils.utils.UtilConstants.NEW;
+import static org.onosproject.yangutils.utils.UtilConstants.NEW_LINE;
+import static org.onosproject.yangutils.utils.UtilConstants.OPEN_CURLY_BRACKET;
+import static org.onosproject.yangutils.utils.UtilConstants.OPEN_PARENTHESIS;
+import static org.onosproject.yangutils.utils.UtilConstants.PERIOD;
+import static org.onosproject.yangutils.utils.UtilConstants.PUBLIC;
+import static org.onosproject.yangutils.utils.UtilConstants.SEMI_COLAN;
+import static org.onosproject.yangutils.utils.UtilConstants.SERVICE_ANNOTATION_IMPORT;
+import static org.onosproject.yangutils.utils.UtilConstants.SPACE;
+import static org.onosproject.yangutils.utils.UtilConstants.THIS;
+import static org.onosproject.yangutils.utils.UtilConstants.TYPE;
+import static org.onosproject.yangutils.utils.io.impl.FileSystemUtil.updateFileHandle;
+
+import static java.util.Collections.sort;
+
+/**
+ * Represents utilities for temporary java code fragments.
+ */
+public final class TempJavaCodeFragmentFilesUtils {
+
+    /**
+     * Creates a private instance of temporary java code fragment utils.
+     */
+    private TempJavaCodeFragmentFilesUtils() {
+    }
+
+    /**
+     * Adds import for AugmentationHolders class.
+     *
+     * @param curNode   current YANG node
+     * @param imports   list of imports
+     * @param operation add or delete import
+     */
+    public static void addAugmentationHoldersImport(YangNode curNode, List<String> imports, boolean operation) {
+        String thisImport = getTempJavaFragement(curNode).getJavaImportData().getAugmentationHolderImport();
+        performOperationOnImports(imports, thisImport, operation);
+    }
+
+    /**
+     * Adds import for AugmentedInfo class.
+     *
+     * @param curNode   current YANG node
+     * @param imports   list of imports
+     * @param operation add or delete import
+     */
+    public static void addAugmentedInfoImport(YangNode curNode, List<String> imports, boolean operation) {
+        String thisImport = getTempJavaFragement(curNode).getJavaImportData().getAugmentedInfoImport();
+        performOperationOnImports(imports, thisImport, operation);
+    }
+
+    /**
+     * Returns temp java fragment.
+     *
+     * @param curNode current YANG node
+     * @return temp java fragments
+     */
+    public static TempJavaFragmentFiles getTempJavaFragement(YangNode curNode) {
+        TempJavaCodeFragmentFiles container = ((TempJavaCodeFragmentFilesContainer) curNode)
+                .getTempJavaCodeFragmentFiles();
+        if (container.getBeanTempFiles() != null) {
+            return container.getBeanTempFiles();
+        }
+        if (container.getServiceTempFiles() != null) {
+            return container.getServiceTempFiles();
+        }
+
+        return null;
+    }
+
+    /**
+     * Updated imports with augmented nodes import.
+     *
+     * @param curNode   current YANG node
+     * @param imports   list of imports
+     * @param operation to add or to delete
+     */
+    public static void addAugmentedNodesImport(YangNode curNode, List<String> imports, boolean operation) {
+
+        String nodesImport = "";
+
+        if (!(curNode instanceof YangJavaAugment)) {
+            throw new TranslatorException("current node should be of type augment node.");
+        }
+        YangJavaAugment augment = (YangJavaAugment) curNode;
+        List<YangNodeIdentifier> targetNodes = augment.getTargetNode();
+        YangNode parent = curNode.getParent();
+        if (parent instanceof YangJavaModule) {
+            // Add impl class import.
+            nodesImport = getAugmendtedNodesImports(parent, targetNodes, true) + SEMI_COLAN + NEW_LINE;
+            performOperationOnImports(imports, nodesImport, operation);
+            // Add builder class import.
+            if (targetNodes.size() > 2) {
+                nodesImport = getAugmendtedNodesImports(parent, targetNodes, false) + SEMI_COLAN + NEW_LINE;
+                performOperationOnImports(imports, nodesImport, operation);
+            }
+        }
+        // TODO: add functionality for submodule and uses.
+    }
+
+    /**
+     * Returns imports for augmented node.
+     *
+     * @param parent      parent YANG node
+     * @param targetNodes list of target nodes
+     * @param isImplClass if impl class's import required
+     * @return imports for augmented node
+     */
+    private static String getAugmendtedNodesImports(YangNode parent, List<YangNodeIdentifier> targetNodes,
+            boolean isImplClass) {
+        String pkgInfo = ((JavaFileInfoContainer) parent).getJavaFileInfo().getPackage();
+
+        for (int i = 0; i < targetNodes.size() - 1; i++) {
+            pkgInfo = pkgInfo + PERIOD + targetNodes.get(i).getName();
+        }
+        String classInfo = targetNodes.get(targetNodes.size() - 1).getName();
+        if (!isImplClass) {
+            return IMPORT + pkgInfo.toLowerCase() + PERIOD + getCapitalCase(classInfo) + BUILDER;
+        }
+        return IMPORT + pkgInfo.toLowerCase() + PERIOD + getCapitalCase(classInfo) + BUILDER + PERIOD
+                + getCapitalCase(classInfo) + IMPL;
+    }
+
+    /**
+     * Provides string to be added in augment node's constructor.
+     *
+     * @param curNode current YANG node
+     * @return constructors string
+     */
+    public static String getAugmentsAddToAugmentedClassString(YangNode curNode) {
+
+        if (!(curNode instanceof YangJavaAugment)) {
+            throw new TranslatorException("current node should be of type augment node.");
+        }
+        YangJavaAugment augment = (YangJavaAugment) curNode;
+        List<YangNodeIdentifier> targetNodes = augment.getTargetNode();
+
+        String name = targetNodes.get(targetNodes.size() - 1).getName();
+        String captialCase = getCapitalCase(name);
+        String smallCase = getSmallCase(captialCase);
+        return EIGHT_SPACE_INDENTATION + captialCase + IMPL + SPACE + smallCase + IMPL + SPACE + EQUAL + SPACE + NEW
+                + SPACE + captialCase + BUILDER + OPEN_PARENTHESIS + CLOSE_PARENTHESIS + PERIOD + NEW + SPACE
+                + captialCase + IMPL + OPEN_PARENTHESIS + CLOSE_PARENTHESIS + SEMI_COLAN + NEW_LINE
+                + EIGHT_SPACE_INDENTATION + smallCase + IMPL + PERIOD + ADD_STRING + AUGMENTATION + OPEN_PARENTHESIS
+                + THIS + CLOSE_PARENTHESIS + SEMI_COLAN + NEW_LINE;
+
+    }
+
+    /**
+     * Adds import for array list.
+     *
+     * @param curNode   current YANG node
+     * @param imports   list of imports
+     * @param operation add or delete import
+     */
+    public static void addArrayListImport(YangNode curNode, List<String> imports, boolean operation) {
+        String arrayListImport = getTempJavaFragement(curNode).getJavaImportData().getImportForArrayList();
+        String listImport = getTempJavaFragement(curNode).getJavaImportData().getImportForList();
+        performOperationOnImports(imports, arrayListImport, operation);
+        if (!imports.contains(listImport)) {
+            /**
+             * List can be there because of attribute also , so no need to remove it and operation will
+             * always be add(true).
+             */
+            performOperationOnImports(imports, listImport, true);
+        }
+    }
+
+    /**
+     * Adds listener's imports.
+     *
+     * @param curNode   currentYangNode.
+     * @param imports   import list
+     * @param operation add or remove
+     * @param classInfo class info to be added to import list
+     */
+    public static void addListnersImport(YangNode curNode, List<String> imports, boolean operation,
+            String classInfo) {
+        String thisImport = "";
+        if (classInfo.equals(LISTENER_SERVICE)) {
+            thisImport = getTempJavaFragement(curNode).getJavaImportData().getListenerServiceImport();
+            performOperationOnImports(imports, thisImport, operation);
+        } else {
+            thisImport = getTempJavaFragement(curNode).getJavaImportData().getListenerRegistryImport();
+            performOperationOnImports(imports, thisImport, operation);
+        }
+    }
+
+    /**
+     * Adds annotations imports.
+     *
+     * @param imports   list if imports
+     * @param operation to add or to delete
+     */
+    public static void addAnnotationsImports(List<String> imports, boolean operation) {
+        if (operation) {
+            imports.add(ACTIVATE_ANNOTATION_IMPORT);
+            imports.add(DEACTIVATE_ANNOTATION_IMPORT);
+            imports.add(COMPONENT_ANNOTATION_IMPORT);
+            imports.add(SERVICE_ANNOTATION_IMPORT);
+            imports.add(LOGGER_FACTORY_IMPORT);
+            imports.add(LOGGER_IMPORT);
+        } else {
+            imports.remove(ACTIVATE_ANNOTATION_IMPORT);
+            imports.remove(DEACTIVATE_ANNOTATION_IMPORT);
+            imports.remove(COMPONENT_ANNOTATION_IMPORT);
+            imports.remove(SERVICE_ANNOTATION_IMPORT);
+            imports.remove(LOGGER_FACTORY_IMPORT);
+            imports.remove(LOGGER_IMPORT);
+        }
+        sortImports(imports);
+    }
+
+    /**
+     * Performs given operations on import list.
+     *
+     * @param imports   list of imports
+     * @param curImport current import
+     * @param operation add or remove
+     * @return import list
+     */
+    private static List<String> performOperationOnImports(List<String> imports, String curImport,
+            boolean operation) {
+        if (operation) {
+            imports.add(curImport);
+        } else {
+            imports.remove(curImport);
+        }
+        sortImports(imports);
+        return imports;
+    }
+
+    /**
+     * Returns true if AugmentationHolder class needs to be extended.
+     *
+     * @param extendsList list of classes need to be extended
+     * @return true or false
+     */
+    public static boolean isAugmentationHolderExtended(List<JavaQualifiedTypeInfo> extendsList) {
+        for (JavaQualifiedTypeInfo info : extendsList) {
+            return info.getClassInfo().equals(AUGMENTATION_HOLDER);
+        }
+        return false;
+    }
+
+    /**
+     * Returns true if AugmentedInfo class needs to be extended.
+     *
+     * @param extendsList list of classes need to be extended
+     * @return true or false
+     */
+    public static boolean isAugmentedInfoExtended(List<JavaQualifiedTypeInfo> extendsList) {
+        for (JavaQualifiedTypeInfo info : extendsList) {
+            return info.getClassInfo().equals(AUGMENTED_INFO);
+        }
+        return false;
+    }
+
+    /**
+     * Closes the file handle for temporary file.
+     *
+     * @param file        file to be closed
+     * @param toBeDeleted flag to indicate if file needs to be deleted
+     * @throws IOException when failed to close the file handle
+     */
+    public static void closeFile(File file, boolean toBeDeleted)
+            throws IOException {
+
+        if (file != null) {
+            updateFileHandle(file, null, true);
+            if (toBeDeleted) {
+                file.delete();
+            }
+        }
+    }
+
+    /**
+     * Returns sorted import list.
+     *
+     * @param imports import list
+     * @return sorted import list
+     */
+    public static List<String> sortImports(List<String> imports) {
+        sort(imports);
+        return imports;
+    }
+
+    /**
+     * Returns event enum start.
+     *
+     * @return event enum start
+     */
+    public static String getEventEnumTypeStart() {
+        return FOUR_SPACE_INDENTATION + PUBLIC + SPACE + ENUM + SPACE + TYPE + SPACE + OPEN_CURLY_BRACKET
+                + NEW_LINE;
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/utils/YangJavaModelUtils.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/utils/YangJavaModelUtils.java
new file mode 100644
index 0000000..3f378c7
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/utils/YangJavaModelUtils.java
@@ -0,0 +1,352 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.translator.tojava.utils;
+
+import java.io.IOException;
+
+import org.onosproject.yangutils.datamodel.RpcNotificationContainer;
+import org.onosproject.yangutils.datamodel.YangCase;
+import org.onosproject.yangutils.datamodel.YangChoice;
+import org.onosproject.yangutils.datamodel.YangLeavesHolder;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangTypeHolder;
+import org.onosproject.yangutils.translator.exception.TranslatorException;
+import org.onosproject.yangutils.translator.tojava.JavaFileInfoContainer;
+import org.onosproject.yangutils.translator.tojava.JavaQualifiedTypeInfo;
+import org.onosproject.yangutils.translator.tojava.TempJavaCodeFragmentFiles;
+import org.onosproject.yangutils.translator.tojava.javamodel.JavaCodeGeneratorInfo;
+import org.onosproject.yangutils.translator.tojava.javamodel.YangJavaEnumeration;
+import org.onosproject.yangutils.translator.tojava.javamodel.YangJavaModule;
+import org.onosproject.yangutils.translator.tojava.javamodel.YangJavaSubModule;
+
+import static org.onosproject.yangutils.datamodel.utils.DataModelUtils.isRpcChildNodePresent;
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.GENERATE_EVENT_CLASS;
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.GENERATE_EVENT_LISTENER_INTERFACE;
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.GENERATE_EVENT_SUBJECT_CLASS;
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.GENERATE_SERVICE_AND_MANAGER;
+import static org.onosproject.yangutils.translator.tojava.TempJavaFragmentFiles.addCurNodeInfoInParentTempFile;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaIdentifierSyntax.getCamelCase;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaIdentifierSyntax.getCapitalCase;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaIdentifierSyntax.getCurNodePackage;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaIdentifierSyntax.getPackageDirPathFromJavaJPackage;
+
+/**
+ * Represents utility class for YANG java model.
+ */
+public final class YangJavaModelUtils {
+
+    /**
+     * Creates an instance of YANG java model utility.
+     */
+    private YangJavaModelUtils() {
+    }
+
+    /**
+     * Updates YANG java file package information.
+     *
+     * @param javaCodeGeneratorInfo YANG java file info node
+     * @param yangPluginConfig      YANG plugin config
+     * @throws IOException IO operations fails
+     */
+    public static void updatePackageInfo(JavaCodeGeneratorInfo javaCodeGeneratorInfo,
+            YangPluginConfig yangPluginConfig)
+            throws IOException {
+
+        javaCodeGeneratorInfo.getJavaFileInfo()
+                .setJavaName(getCamelCase(((YangNode) javaCodeGeneratorInfo).getName(),
+                        yangPluginConfig.getConflictResolver()));
+        javaCodeGeneratorInfo.getJavaFileInfo().setPackage(getCurNodePackage((YangNode) javaCodeGeneratorInfo));
+        javaCodeGeneratorInfo.getJavaFileInfo().setPackageFilePath(
+                getPackageDirPathFromJavaJPackage(javaCodeGeneratorInfo.getJavaFileInfo().getPackage()));
+        javaCodeGeneratorInfo.getJavaFileInfo().setBaseCodeGenPath(yangPluginConfig.getCodeGenDir());
+        javaCodeGeneratorInfo.getJavaFileInfo().setPluginConfig(yangPluginConfig);
+    }
+
+    /**
+     * Updates YANG java file package information for specified package.
+     *
+     * @param javaCodeGeneratorInfo YANG java file info node
+     * @param yangPlugin            YANG plugin config
+     * @throws IOException IO operations fails
+     */
+    private static void updatePackageInfo(JavaCodeGeneratorInfo javaCodeGeneratorInfo, YangPluginConfig yangPlugin,
+            String pkg)
+            throws IOException {
+        javaCodeGeneratorInfo.getJavaFileInfo()
+                .setJavaName(getCamelCase(((YangNode) javaCodeGeneratorInfo).getName(),
+                        yangPlugin.getConflictResolver()));
+        javaCodeGeneratorInfo.getJavaFileInfo().setPackage(pkg);
+        javaCodeGeneratorInfo.getJavaFileInfo().setPackageFilePath(
+                getPackageDirPathFromJavaJPackage(javaCodeGeneratorInfo.getJavaFileInfo().getPackage()));
+        javaCodeGeneratorInfo.getJavaFileInfo().setBaseCodeGenPath(yangPlugin.getCodeGenDir());
+        javaCodeGeneratorInfo.getJavaFileInfo().setPluginConfig(yangPlugin);
+    }
+
+    /**
+     * Updates temporary java code fragment files.
+     *
+     * @param javaCodeGeneratorInfo YANG java file info node
+     * @throws IOException IO operations fails
+     */
+    private static void createTempFragmentFile(JavaCodeGeneratorInfo javaCodeGeneratorInfo)
+            throws IOException {
+        javaCodeGeneratorInfo.setTempJavaCodeFragmentFiles(
+                new TempJavaCodeFragmentFiles(javaCodeGeneratorInfo.getJavaFileInfo()));
+    }
+
+    /**
+     * Updates leaf information in temporary java code fragment files.
+     *
+     * @param javaCodeGeneratorInfo YANG java file info node
+     * @throws IOException IO operations fails
+     */
+    private static void updateTempFragmentFiles(JavaCodeGeneratorInfo javaCodeGeneratorInfo,
+            YangPluginConfig yangPluginConfig)
+            throws IOException {
+        if (javaCodeGeneratorInfo instanceof RpcNotificationContainer) {
+            /*
+             * Module / sub module node code generation.
+             */
+            javaCodeGeneratorInfo.getTempJavaCodeFragmentFiles()
+                    .getServiceTempFiles().addCurNodeLeavesInfoToTempFiles(
+                    (YangNode) javaCodeGeneratorInfo, yangPluginConfig);
+            if ((YangNode) javaCodeGeneratorInfo instanceof YangJavaModule) {
+                if (!((YangJavaModule) javaCodeGeneratorInfo).getNotificationNodes().isEmpty()) {
+                    updateNotificaitonNodeInfo(javaCodeGeneratorInfo, yangPluginConfig);
+                }
+            } else if ((YangNode) javaCodeGeneratorInfo instanceof YangJavaSubModule) {
+                if (!((YangJavaSubModule) javaCodeGeneratorInfo).getNotificationNodes().isEmpty()) {
+                    updateNotificaitonNodeInfo(javaCodeGeneratorInfo, yangPluginConfig);
+                }
+            }
+
+        } else if (javaCodeGeneratorInfo instanceof YangLeavesHolder) {
+            /*
+             * Container
+             * Case
+             * Grouping
+             * Input
+             * List
+             * Notification
+             * Output
+             */
+            javaCodeGeneratorInfo.getTempJavaCodeFragmentFiles()
+                    .getBeanTempFiles().addCurNodeLeavesInfoToTempFiles(
+                    (YangNode) javaCodeGeneratorInfo, yangPluginConfig);
+        } else if (javaCodeGeneratorInfo instanceof YangTypeHolder) {
+            /*
+             * Typedef
+             * Union
+             */
+            javaCodeGeneratorInfo.getTempJavaCodeFragmentFiles()
+                    .addTypeInfoToTempFiles((YangTypeHolder) javaCodeGeneratorInfo, yangPluginConfig);
+        } else if (javaCodeGeneratorInfo instanceof YangJavaEnumeration) {
+            /*
+             * Enumeration
+             */
+            javaCodeGeneratorInfo.getTempJavaCodeFragmentFiles().getEnumerationTempFiles()
+                    .addEnumAttributeToTempFiles((YangNode) javaCodeGeneratorInfo, yangPluginConfig);
+
+        } else if (javaCodeGeneratorInfo instanceof YangChoice) {
+            /*Do nothing, only the interface needs to be generated*/
+        } else {
+            throw new TranslatorException("Unsupported Node Translation");
+        }
+    }
+
+    /**
+     * Process generate code entry of YANG node.
+     *
+     * @param javaCodeGeneratorInfo YANG java file info node
+     * @throws IOException IO operations fails
+     */
+    private static void generateTempFiles(JavaCodeGeneratorInfo javaCodeGeneratorInfo,
+            YangPluginConfig yangPluginConfig)
+            throws IOException {
+        if (!(javaCodeGeneratorInfo instanceof YangNode)) {
+            throw new TranslatorException("translation is not supported for the node");
+        }
+        createTempFragmentFile(javaCodeGeneratorInfo);
+        updateTempFragmentFiles(javaCodeGeneratorInfo, yangPluginConfig);
+
+    }
+
+    /**
+     * Updates notification node info in service temporary file.
+     *
+     * @param javaCodeGeneratorInfo java code generator info
+     * @param yangPluginConfig      plugin configurations
+     * @throws IOException when fails to do IO operations
+     */
+    private static void updateNotificaitonNodeInfo(JavaCodeGeneratorInfo javaCodeGeneratorInfo,
+            YangPluginConfig yangPluginConfig)
+            throws IOException {
+        if ((YangNode) javaCodeGeneratorInfo instanceof YangJavaModule) {
+            for (YangNode notificaiton : ((YangJavaModule) javaCodeGeneratorInfo).getNotificationNodes()) {
+                javaCodeGeneratorInfo.getTempJavaCodeFragmentFiles()
+                        .getServiceTempFiles()
+                        .addJavaSnippetOfEvent(notificaiton, yangPluginConfig);
+            }
+        }
+        if ((YangNode) javaCodeGeneratorInfo instanceof YangJavaSubModule) {
+            for (YangNode notificaiton : ((YangJavaSubModule) javaCodeGeneratorInfo)
+                    .getNotificationNodes()) {
+                javaCodeGeneratorInfo.getTempJavaCodeFragmentFiles()
+                        .getServiceTempFiles()
+                        .addJavaSnippetOfEvent(notificaiton, yangPluginConfig);
+            }
+        }
+    }
+
+    /**
+     * Generates code for the current ata model node and adds itself as an attribute in the parent.
+     *
+     * @param javaCodeGeneratorInfo YANG java file info node
+     * @param yangPlugin            YANG plugin config
+     * @param isMultiInstance       flag to indicate whether it's a list
+     * @throws IOException IO operations fails
+     */
+    public static void generateCodeAndUpdateInParent(JavaCodeGeneratorInfo javaCodeGeneratorInfo,
+            YangPluginConfig yangPlugin, boolean isMultiInstance)
+            throws IOException {
+        if (!(javaCodeGeneratorInfo instanceof YangNode)) {
+            throw new TranslatorException("Invalid node for translation");
+        }
+
+        /*
+         * Generate the Java files corresponding to the current node.
+         */
+        generateCodeOfAugmentableNode(javaCodeGeneratorInfo, yangPlugin);
+
+        /*
+         * Update the current nodes info in its parent nodes generated files.
+         */
+        addCurNodeInfoInParentTempFile((YangNode) javaCodeGeneratorInfo, isMultiInstance, yangPlugin);
+    }
+
+    /**
+     * Generates code for the current data model node and adds support for it to be augmented.
+     *
+     * @param javaCodeGeneratorInfo YANG java file info node
+     * @param yangPlugin            YANG plugin config
+     * @throws IOException IO operations fails
+     */
+    public static void generateCodeOfAugmentableNode(JavaCodeGeneratorInfo javaCodeGeneratorInfo,
+            YangPluginConfig yangPlugin)
+            throws IOException {
+        if (!(javaCodeGeneratorInfo instanceof YangNode)) {
+            throw new TranslatorException("invalid node for translation");
+        }
+
+        generateCodeOfNode(javaCodeGeneratorInfo, yangPlugin);
+
+        /*
+        TODO: Need to use this, when augmentation is added in YMS
+         * For augmentation of nodes.
+
+        if (javaCodeGeneratorInfo instanceof YangAugmentationHolder) {
+            JavaQualifiedTypeInfo augmentationHoldersInfo = new JavaQualifiedTypeInfo();
+            augmentationHoldersInfo.setClassInfo(AUGMENTATION_HOLDER);
+            augmentationHoldersInfo.setPkgInfo(PROVIDED_AUGMENTATION_CLASS_IMPORT_PKG);
+            javaCodeGeneratorInfo.getTempJavaCodeFragmentFiles().getBeanTempFiles().getJavaExtendsListHolder()
+                    .addToExtendsList(augmentationHoldersInfo, (YangNode) javaCodeGeneratorInfo);
+
+        } else if (javaCodeGeneratorInfo instanceof YangAugment) {
+            JavaQualifiedTypeInfo augmentedInfo = new JavaQualifiedTypeInfo();
+            augmentedInfo.setClassInfo(AUGMENTED_INFO);
+            augmentedInfo.setPkgInfo(PROVIDED_AUGMENTATION_CLASS_IMPORT_PKG);
+            javaCodeGeneratorInfo.getTempJavaCodeFragmentFiles().getBeanTempFiles().getJavaExtendsListHolder()
+                    .addToExtendsList(augmentedInfo, (YangNode) javaCodeGeneratorInfo);
+
+        }
+        */
+        if (javaCodeGeneratorInfo instanceof YangCase) {
+            YangNode parent = ((YangCase) javaCodeGeneratorInfo).getParent();
+            JavaQualifiedTypeInfo parentsInfo = new JavaQualifiedTypeInfo();
+            String parentName = getCapitalCase(((JavaFileInfoContainer) parent).getJavaFileInfo().getJavaName());
+            String parentPkg = ((JavaFileInfoContainer) parent).getJavaFileInfo().getPackage();
+            parentsInfo.setClassInfo(parentName);
+            parentsInfo.setPkgInfo(parentPkg);
+            javaCodeGeneratorInfo.getTempJavaCodeFragmentFiles().getBeanTempFiles().getJavaExtendsListHolder()
+                    .addToExtendsList(parentsInfo, (YangNode) javaCodeGeneratorInfo);
+
+            javaCodeGeneratorInfo.getTempJavaCodeFragmentFiles().getBeanTempFiles()
+                    .addParentInfoInCurNodeTempFile((YangNode) javaCodeGeneratorInfo, yangPlugin);
+
+        }
+    }
+
+    /**
+     * Generates code for the current data model node.
+     *
+     * @param javaCodeGeneratorInfo YANG java file info node
+     * @param yangPluginConfig      YANG plugin config
+     * @throws IOException IO operations fails
+     */
+    public static void generateCodeOfNode(JavaCodeGeneratorInfo javaCodeGeneratorInfo,
+            YangPluginConfig yangPluginConfig)
+            throws IOException {
+        if (!(javaCodeGeneratorInfo instanceof YangNode)) {
+            // TODO:throw exception
+        }
+        updatePackageInfo(javaCodeGeneratorInfo, yangPluginConfig);
+        generateTempFiles(javaCodeGeneratorInfo, yangPluginConfig);
+    }
+
+    /**
+     * Generates code for the root module/sub-module node.
+     *
+     * @param javaCodeGeneratorInfo YANG java file info node
+     * @param yangPluginConfig      YANG plugin config
+     * @param rootPkg               package of the root node
+     * @throws IOException IO operations fails
+     */
+    public static void generateCodeOfRootNode(JavaCodeGeneratorInfo javaCodeGeneratorInfo,
+            YangPluginConfig yangPluginConfig, String rootPkg)
+            throws IOException {
+        if (!(javaCodeGeneratorInfo instanceof YangNode)) {
+            // TODO:throw exception
+        }
+        updatePackageInfo(javaCodeGeneratorInfo, yangPluginConfig, rootPkg);
+
+        if (isRpcChildNodePresent((YangNode) javaCodeGeneratorInfo)) {
+            javaCodeGeneratorInfo.getJavaFileInfo().addGeneratedFileTypes(GENERATE_SERVICE_AND_MANAGER);
+        }
+
+        if ((YangNode) javaCodeGeneratorInfo instanceof YangJavaModule) {
+            if (!((YangJavaModule) javaCodeGeneratorInfo)
+                    .isNotificationChildNodePresent((YangNode) javaCodeGeneratorInfo)) {
+                updateCodeGenInfoForEvent(javaCodeGeneratorInfo);
+            }
+        } else if ((YangNode) javaCodeGeneratorInfo instanceof YangJavaSubModule) {
+            if (!((YangJavaSubModule) javaCodeGeneratorInfo)
+                    .isNotificationChildNodePresent((YangNode) javaCodeGeneratorInfo)) {
+                updateCodeGenInfoForEvent(javaCodeGeneratorInfo);
+            }
+        }
+
+        generateTempFiles(javaCodeGeneratorInfo, yangPluginConfig);
+    }
+
+    /*Updates java code generator info with events info.*/
+    private static void updateCodeGenInfoForEvent(JavaCodeGeneratorInfo javaCodeGeneratorInfo) {
+        javaCodeGeneratorInfo.getJavaFileInfo().addGeneratedFileTypes(GENERATE_EVENT_SUBJECT_CLASS);
+        javaCodeGeneratorInfo.getJavaFileInfo().addGeneratedFileTypes(GENERATE_EVENT_CLASS);
+        javaCodeGeneratorInfo.getJavaFileInfo().addGeneratedFileTypes(GENERATE_EVENT_LISTENER_INTERFACE);
+    }
+
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/utils/YangPluginConfig.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/utils/YangPluginConfig.java
new file mode 100644
index 0000000..f827698
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/utils/YangPluginConfig.java
@@ -0,0 +1,75 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.translator.tojava.utils;
+
+/**
+ * Representation of plugin configurations required for YANG utils.
+ */
+public final class YangPluginConfig {
+
+    /**
+     * Contains the code generation directory.
+     */
+    private String codeGenDir;
+
+    /**
+     * Contains information of naming conflicts that can be resolved.
+     */
+    private YangToJavaNamingConflictUtil conflictResolver;
+
+    /**
+     * Creates an object for YANG plugin config.
+     */
+    public YangPluginConfig() {
+    }
+
+    /**
+     * Sets the path of the java code where it has to be generated.
+     *
+     * @param codeGenDir path of the directory
+     */
+    public void setCodeGenDir(String codeGenDir) {
+        this.codeGenDir = codeGenDir;
+    }
+
+    /**
+     * Returns the code generation directory path.
+     *
+     * @return code generation directory
+     */
+    public String getCodeGenDir() {
+        return codeGenDir;
+    }
+
+    /**
+     * Sets the object.
+     *
+     * @param conflictResolver object of the class
+     */
+    public void setConflictResolver(YangToJavaNamingConflictUtil conflictResolver) {
+        this.conflictResolver = conflictResolver;
+    }
+
+    /**
+     * Returns the object.
+     *
+     * @return object of the class
+     */
+    public YangToJavaNamingConflictUtil getConflictResolver() {
+        return conflictResolver;
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/utils/YangToJavaNamingConflictUtil.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/utils/YangToJavaNamingConflictUtil.java
new file mode 100644
index 0000000..4f701b6
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/utils/YangToJavaNamingConflictUtil.java
@@ -0,0 +1,121 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.translator.tojava.utils;
+
+/**
+ * Representation of YANG to java naming conflict resolver util.
+ */
+public final class YangToJavaNamingConflictUtil {
+
+    /**
+     * Contains the replacement value for a period.
+     */
+    private static String replacementForPeriodInIdentifier;
+
+    /**
+     * Contains the replacement value for an underscore.
+     */
+    private static String replacementForUnderscoreInIdentifier;
+
+    /**
+     * Contains the replacement value for a hyphen.
+     */
+    private static String replacementForHyphenInIdentifier;
+
+    /**
+     * Contains the prefix value for adding with the identifier.
+     */
+    private static String prefixForIdentifier;
+
+    /**
+     * Creates an object for YANG to java naming conflict util.
+     */
+    public YangToJavaNamingConflictUtil() {
+    }
+
+    /**
+     * Sets the replacement value for a period.
+     *
+     * @param periodReplacement replacement value for period
+     */
+    public void setReplacementForPeriod(String periodReplacement) {
+        replacementForPeriodInIdentifier = periodReplacement;
+    }
+
+    /**
+     * Returns the replaced period value.
+     *
+     * @return replaced period
+     */
+    public String getReplacementForPeriod() {
+        return replacementForPeriodInIdentifier;
+    }
+
+    /**
+     * Sets the replacement value for a hyphen.
+     *
+     * @param hyphenReplacement replacement value for hyphen
+     */
+    public void setReplacementForHyphen(String hyphenReplacement) {
+        replacementForHyphenInIdentifier = hyphenReplacement;
+    }
+
+    /**
+     * Returns the replaced hyphen value.
+     *
+     * @return replaced hyphen
+     */
+    public String getReplacementForHyphen() {
+        return replacementForHyphenInIdentifier;
+    }
+
+    /**
+     * Sets the replacement value for an underscore.
+     *
+     * @param underscoreReplacement replacement value for underscore
+     */
+    public void setReplacementForUnderscore(String underscoreReplacement) {
+        replacementForUnderscoreInIdentifier = underscoreReplacement;
+    }
+
+    /**
+     * Returns the replaced underscore value.
+     *
+     * @return replaced underscore
+     */
+    public String getReplacementForUnderscore() {
+        return replacementForUnderscoreInIdentifier;
+    }
+
+    /**
+     * Sets the prefix value for adding with the identifier.
+     *
+     * @param prefix prefix for identifier
+     */
+    public void setPrefixForIdentifier(String prefix) {
+        prefixForIdentifier = prefix;
+    }
+
+    /**
+     * Returns the prefix for identifier.
+     *
+     * @return prefix for identifier
+     */
+    public String getPrefixForIdentifier() {
+        return prefixForIdentifier;
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/utils/package-info.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/utils/package-info.java
new file mode 100644
index 0000000..709e704
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/translator/tojava/utils/package-info.java
@@ -0,0 +1,20 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Translator's utils for YANG plugin.
+ */
+package org.onosproject.yangutils.translator.tojava.utils;
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/utils/AugmentationHolder.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/utils/AugmentationHolder.java
new file mode 100644
index 0000000..b306fe2
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/utils/AugmentationHolder.java
@@ -0,0 +1,44 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.utils;
+
+import java.util.List;
+
+/**
+ * Abstraction of an entity which represents augmentation of a YANG node.
+ */
+public interface AugmentationHolder {
+
+    /**
+     * Adds augment info to the augment info list.
+     *
+     * @param augmentInfo augment info of node
+     */
+    void addAugmentation(AugmentedInfo augmentInfo);
+
+    /**
+     * Removes augment info from the node.
+     */
+    void removeAugmentation();
+
+    /**
+     * Returns list of augment info.
+     *
+     * @return list of augment info
+     */
+    List<AugmentedInfo> getAugmentedInfoList();
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/utils/AugmentedInfo.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/utils/AugmentedInfo.java
new file mode 100644
index 0000000..566caf0
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/utils/AugmentedInfo.java
@@ -0,0 +1,23 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.utils;
+
+/**
+ * Abstraction of an entity which represents augmented info.
+ */
+public interface AugmentedInfo {
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/utils/UtilConstants.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/utils/UtilConstants.java
new file mode 100644
index 0000000..37b8992
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/utils/UtilConstants.java
@@ -0,0 +1,1162 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.utils;
+
+import java.io.File;
+import java.util.Arrays;
+import java.util.List;
+
+/**
+ * Represents utilities constants which are used while generating java files.
+ */
+public final class UtilConstants {
+
+    /**
+     * JavaDocs for impl class.
+     */
+    public static final String IMPL_CLASS_JAVA_DOC = " * Represents the implementation of ";
+
+    /**
+     * JavaDocs for builder class.
+     */
+    public static final String BUILDER_CLASS_JAVA_DOC = " * Represents the builder implementation of ";
+
+    /**
+     * JavaDocs for interface class.
+     */
+    public static final String INTERFACE_JAVA_DOC = " * Abstraction of an entity which represents the"
+            + " functionality of ";
+
+    /**
+     * JavaDocs for event.
+     */
+    public static final String EVENT_JAVA_DOC = " * Represents event implementation of ";
+
+    /**
+     * JavaDocs for event listener.
+     */
+    public static final String EVENT_LISTENER_JAVA_DOC = " * Abstraction for event listener of ";
+
+    /**
+     * JavaDocs for builder interface class.
+     */
+    public static final String BUILDER_INTERFACE_JAVA_DOC = " * Builder for ";
+
+    /**
+     * JavaDocs for enum class.
+     */
+    public static final String ENUM_CLASS_JAVADOC = " * Represents ENUM data of ";
+
+    /**
+     * JavaDocs for enum attribute.
+     */
+    public static final String ENUM_ATTRIBUTE_JAVADOC = " * Represents ";
+
+    /**
+     * JavaDocs for package info class.
+     */
+    public static final String PACKAGE_INFO_JAVADOC = " * Implementation of YANG node ";
+
+    /**
+     * JavaDocs for package info class.
+     */
+    public static final String PACKAGE_INFO_JAVADOC_OF_CHILD = "'s children nodes";
+
+    /**
+     * JavaDocs's first line.
+     */
+    public static final String JAVA_DOC_FIRST_LINE = "/**\n";
+
+    /**
+     * JavaDocs's last line.
+     */
+    public static final String JAVA_DOC_END_LINE = " */\n";
+
+    /**
+     * JavaDocs's param annotation.
+     */
+    public static final String JAVA_DOC_PARAM = " * @param ";
+
+    /**
+     * JavaDocs's return annotation.
+     */
+    public static final String JAVA_DOC_RETURN = " * @return ";
+
+    /**
+     * JavaDocs's throw annotation.
+     */
+    public static final String JAVA_DOC_THROWS = " * @throws ";
+
+    /**
+     * JavaDocs's description for setter method.
+     */
+    public static final String JAVA_DOC_SETTERS = " * Returns the builder object of ";
+
+    /**
+     * JavaDocs's description for setter method.
+     */
+    public static final String JAVA_DOC_MANAGER_SETTERS = " * Sets the value to attribute ";
+
+    /**
+     * JavaDocs's description for OF method.
+     */
+    public static final String JAVA_DOC_OF = " * Returns the object of ";
+
+    /**
+     * JavaDocs's description for typedef' setter method.
+     */
+    public static final String JAVA_DOC_SETTERS_COMMON = " * Sets the value of ";
+
+    /**
+     * JavaDocs's description for getter method.
+     */
+    public static final String JAVA_DOC_GETTERS = " * Returns the attribute ";
+
+    /**
+     * JavaDocs's description for constructor.
+     */
+    public static final String JAVA_DOC_CONSTRUCTOR = " * Creates an instance of ";
+
+    /**
+     * JavaDocs's description for build method.
+     */
+    public static final String JAVA_DOC_BUILD = " * Builds object of ";
+
+    /**
+     * JavaDocs's return statement for build method.
+     */
+    public static final String JAVA_DOC_BUILD_RETURN = "object of ";
+
+    /**
+     * JavaDocs's statement for builder object.
+     */
+    public static final String BUILDER_OBJECT = "builder object of ";
+
+    /**
+     * JavaDocs's statement for rpc method.
+     */
+    public static final String JAVA_DOC_RPC = " * Service interface of ";
+
+    /**
+     * JavaDocs's statement for rpc's input string.
+     */
+    public static final String RPC_INPUT_STRING = "input of service interface ";
+
+    /**
+     * JavaDocs's statement for rpc's output string.
+     */
+    public static final String RPC_OUTPUT_STRING = "output of service interface ";
+
+    /**
+     * Static attribute for new line.
+     */
+    public static final String NEW_LINE = "\n";
+
+    /**
+     * Static attribute for default.
+     */
+    public static final String DEFAULT = "default";
+
+    /**
+     * Static attribute for multiple new line.
+     */
+    public static final String MULTIPLE_NEW_LINE = "\n\n";
+
+    /**
+     * Static attribute for empty line.
+     */
+    public static final String EMPTY_STRING = "";
+
+    /**
+     * Static attribute for new line with asterisk.
+     */
+    public static final String NEW_LINE_ASTERISK = " *\n";
+
+    /**
+     * Static attribute for period.
+     */
+    public static final String PERIOD = ".";
+
+    /**
+     * Static attribute for parse byte.
+     */
+    public static final String PARSE_BYTE = "parseByte";
+
+    /**
+     * Static attribute for parse boolean.
+     */
+    public static final String PARSE_BOOLEAN = "parseBoolean";
+
+    /**
+     * Static attribute for parse short.
+     */
+    public static final String PARSE_SHORT = "parseShort";
+
+    /**
+     * Static attribute for parse int.
+     */
+    public static final String PARSE_INT = "parseInt";
+
+    /**
+     * Static attribute for parse long.
+     */
+    public static final String PARSE_LONG = "parseLong";
+
+    /**
+     * Static attribute for omit null value.
+     */
+    public static final String OMIT_NULL_VALUE_STRING = "omitNullValues()";
+
+    /**
+     * Static attribute for colan.
+     */
+    public static final String COLAN = ":";
+
+    /**
+     * Static attribute for underscore.
+     */
+    public static final String UNDER_SCORE = "_";
+
+    /**
+     * Static attribute for semi-colan.
+     */
+    public static final String SEMI_COLAN = ";";
+
+    /**
+     * Static attribute for hyphen.
+     */
+    public static final String HYPHEN = "-";
+
+    /**
+     * Static attribute for space.
+     */
+    public static final String SPACE = " ";
+
+    /**
+     * Static attribute for subject.
+     */
+    public static final String SUBJECT = "Subject";
+
+    /**
+     * Static attribute for ListenerRegistry.
+     */
+    public static final String LISTENER_REG = "ListenerRegistry";
+
+    /**
+     * Static attribute for ListenerService.
+     */
+    public static final String LISTENER_SERVICE = "ListenerService";
+
+    /**
+     * Static attribute for listener package.
+     */
+    public static final String ONOS_EVENT_PKG = "org.onosproject.event";
+
+    /**
+     * Static attribute for colon.
+     */
+    public static final String COLON = ":";
+
+    /**
+     * Static attribute for caret.
+     */
+    public static final String CARET = "^";
+
+    /**
+     * Static attribute for input string.
+     */
+    public static final String INPUT = "input";
+
+    /**
+     * Static attribute for leafref string.
+     */
+    public static final String LEAFREF = "leafref";
+
+    /**
+     * Static attribute for identityref string.
+     */
+    public static final String IDENTITYREF = "identityref";
+
+    /**
+     * Static attribute for instance identifier string.
+     */
+    public static final String INSTANCE_IDENTIFIER = "instance-identifier";
+
+    /**
+     * Static attribute for output variable of rpc.
+     */
+    public static final String RPC_INPUT_VAR_NAME = "inputVar";
+
+    /**
+     * Static attribute for new line.
+     */
+    public static final String EQUAL = "=";
+
+    /**
+     * Static attribute for slash syntax.
+     */
+    public static final String SLASH = File.separator;
+
+    /**
+     * Static attribute for add syntax.
+     */
+    public static final String ADD = "+";
+
+    /**
+     * Static attribute for asterisk.
+     */
+    public static final String ASTERISK = "*";
+
+    /**
+     * Static attribute for at.
+     */
+    public static final String AT = "@";
+
+    /**
+     * Static attribute for quotes.
+     */
+    public static final String QUOTES = "\"";
+
+    /**
+     * Static attribute for ampersand.
+     */
+    public static final String AND = "&";
+
+    /**
+     * Static attribute for comma.
+     */
+    public static final String COMMA = ",";
+
+    /**
+     * Static attribute for add syntax.
+     */
+    public static final String ADD_STRING = "add";
+
+    /**
+     * Static attribute for from syntax.
+     */
+    public static final String FROM_STRING_METHOD_NAME = "fromString";
+
+    /**
+     * Static attribute for check not null syntax.
+     */
+    public static final String CHECK_NOT_NULL_STRING = "checkNotNull";
+
+    /**
+     * Static attribute for hash code syntax.
+     */
+    public static final String HASH_CODE_STRING = "hashCode";
+
+    /**
+     * Static attribute for equals syntax.
+     */
+    public static final String EQUALS_STRING = "equals";
+
+    /**
+     * Static attribute for object.
+     */
+    public static final String OBJECT_STRING = "Object";
+
+    /**
+     * Static attribute for instance of syntax.
+     */
+    public static final String INSTANCE_OF = " instanceof ";
+
+    /**
+     * Static attribute for value syntax.
+     */
+    public static final String VALUE = "value";
+
+    /**
+     * Static attribute for enumValue syntax.
+     */
+    public static final String ENUM_VALUE = "enumValue";
+
+    /**
+     * Static attribute for suffix s.
+     */
+    public static final String SUFFIX_S = "s";
+
+    /**
+     * Static attribute for if.
+     */
+    public static final String IF = "if";
+
+    /**
+     * Static attribute for for.
+     */
+    public static final String FOR = "for";
+
+    /**
+     * Static attribute for while.
+     */
+    public static final String WHILE = "while";
+
+    /**
+     * Static attribute for of.
+     */
+    public static final String OF = "of";
+
+    /**
+     * Static attribute for other.
+     */
+    public static final String OTHER = "other";
+
+    /**
+     * Static attribute for obj syntax.
+     */
+    public static final String OBJ = "obj";
+
+    /**
+     * Static attribute for hash syntax.
+     */
+    public static final String HASH = "hash";
+
+    /**
+     * Static attribute for to syntax.
+     */
+    public static final String TO = "to";
+
+    /**
+     * Static attribute for true syntax.
+     */
+    public static final String TRUE = "true";
+
+    /**
+     * Static attribute for false syntax.
+     */
+    public static final String FALSE = "false";
+
+    /**
+     * Static attribute for org.
+     */
+    public static final String ORG = "org";
+
+    /**
+     * Static attribute for temp.
+     */
+    public static final String TEMP = "temp";
+
+    /**
+     * Static attribute for YANG file directory.
+     */
+    public static final String YANG_RESOURCES = "yang/resources";
+
+    /**
+     * Static attribute for diamond close bracket syntax.
+     */
+    public static final String DIAMOND_OPEN_BRACKET = "<";
+
+    /**
+     * Static attribute for diamond close bracket syntax.
+     */
+    public static final String DIAMOND_CLOSE_BRACKET = ">";
+
+    /**
+     * Static attribute for exception syntax.
+     */
+    public static final String EXCEPTION = "Exception";
+
+    /**
+     * Static attribute for exception variable syntax.
+     */
+    public static final String EXCEPTION_VAR = "e";
+
+    /**
+     * Static attribute for open parenthesis syntax.
+     */
+    public static final String OPEN_PARENTHESIS = "(";
+
+    /**
+     * Static attribute for clear syntax.
+     */
+    public static final String CLEAR = "clear";
+
+    /**
+     * Static attribute for switch syntax.
+     */
+    public static final String SWITCH = "switch";
+
+    /**
+     * Static attribute for case syntax.
+     */
+    public static final String CASE = "case";
+
+    /**
+     * Static attribute for temp val syntax.
+     */
+    public static final String TMP_VAL = "tmpVal";
+
+    /**
+     * From string parameter name.
+     */
+    public static final String FROM_STRING_PARAM_NAME = "valInString";
+
+    /**
+     * Static attribute for close parenthesis syntax.
+     */
+    public static final String CLOSE_PARENTHESIS = ")";
+
+    /**
+     * Static attribute for open curly bracket syntax.
+     */
+    public static final String OPEN_CURLY_BRACKET = "{";
+
+    /**
+     * Static attribute for close curly bracket syntax.
+     */
+    public static final String CLOSE_CURLY_BRACKET = "}";
+
+    /**
+     * Static attribute for getter method prefix.
+     */
+    public static final String GET_METHOD_PREFIX = "get";
+
+    /**
+     * Static attribute for setter method prefix.
+     */
+    public static final String SET_METHOD_PREFIX = "set";
+
+    /**
+     * Static attribute for four space indentation.
+     */
+    public static final String FOUR_SPACE_INDENTATION = "    ";
+
+    /**
+     * Static attribute for not syntax.
+     */
+    public static final String NOT = "!";
+
+    /**
+     * Static attribute for try syntax.
+     */
+    public static final String TRY = "try";
+
+    /**
+     * Static attribute for catch syntax.
+     */
+    public static final String CATCH = "catch";
+
+    /**
+     * Static attribute for eight space indentation.
+     */
+    public static final String EIGHT_SPACE_INDENTATION = FOUR_SPACE_INDENTATION + FOUR_SPACE_INDENTATION;
+
+    /**
+     * Static attribute for twelve space indentation.
+     */
+    public static final String TWELVE_SPACE_INDENTATION = FOUR_SPACE_INDENTATION + EIGHT_SPACE_INDENTATION;
+
+    /**
+     * Static attribute for sixteen space indentation.
+     */
+    public static final String SIXTEEN_SPACE_INDENTATION = EIGHT_SPACE_INDENTATION + EIGHT_SPACE_INDENTATION;
+
+    /**
+     * Static attribute for generated code path.
+     */
+    public static final String YANG_GEN_DIR = "src/main/java/";
+
+    /**
+     * Static attribute for base package.
+     */
+    public static final String DEFAULT_BASE_PKG = "org.onosproject.yang.gen";
+
+    /**
+     * Static attribute for YANG date prefix.
+     */
+    public static final String REVISION_PREFIX = "rev";
+
+    /**
+     * Static attribute for YANG automatic prefix for identifiers with keywords and beginning with digits.
+     */
+    public static final String YANG_AUTO_PREFIX = "yangAutoPrefix";
+
+    /**
+     * Static attribute for YANG version perifx.
+     */
+    public static final String VERSION_PREFIX = "v";
+
+    /**
+     * Static attribute for private modifier.
+     */
+    public static final String PRIVATE = "private";
+
+    /**
+     * Static attribute for public modifier.
+     */
+    public static final String PUBLIC = "public";
+
+    /**
+     * Static attribute for protected modifier.
+     */
+    public static final String PROTECTED = "protected";
+
+    /**
+     * Void java type.
+     */
+    public static final String VOID = "void";
+
+    /**
+     * String built in java type.
+     */
+    public static final String STRING_DATA_TYPE = "String";
+
+    /**
+     * Java.lang.* packages.
+     */
+    public static final String JAVA_LANG = "java.lang";
+
+    /**
+     * Java.math.* packages.
+     */
+    public static final String JAVA_MATH = "java.math";
+
+    /**
+     * Boolean built in java type.
+     */
+    public static final String BOOLEAN_DATA_TYPE = "boolean";
+
+    /**
+     * BigInteger built in java type.
+     */
+    public static final String BIG_INTEGER = "BigInteger";
+
+    /**
+     * Byte java built in type.
+     */
+    public static final String BYTE = "byte";
+
+    /**
+     * Short java built in type.
+     */
+    public static final String SHORT = "short";
+
+    /**
+     * Int java built in type.
+     */
+    public static final String INT = "int";
+
+    /**
+     * Long java built in type.
+     */
+    public static final String LONG = "long";
+
+    /**
+     * Float java built in type.
+     */
+    public static final String FLOAT = "float";
+
+    /**
+     * Double java built in type.
+     */
+    public static final String DOUBLE = "double";
+
+    /**
+     * Boolean built in java wrapper type.
+     */
+    public static final String BOOLEAN_WRAPPER = "Boolean";
+
+    /**
+     * Byte java built in wrapper type.
+     */
+    public static final String BYTE_WRAPPER = "Byte";
+
+    /**
+     * Short java built in wrapper type.
+     */
+    public static final String SHORT_WRAPPER = "Short";
+
+    /**
+     * Integer java built in wrapper type.
+     */
+    public static final String INTEGER_WRAPPER = "Integer";
+
+    /**
+     * Long java built in wrapper type.
+     */
+    public static final String LONG_WRAPPER = "Long";
+
+    /**
+     * YangUint64 java built in wrapper type.
+     */
+    public static final String YANG_UINT64 = "YangUint64";
+
+    /**
+     * List of keywords in java, this is used for checking if the input does not contain these keywords.
+     */
+    public static final List<String> JAVA_KEY_WORDS = Arrays.asList(
+            "abstract", "assert", "boolean", "break", "byte", "case", "catch", "char", "class", "const", "continue",
+            "default", "do", "double", "else", "extends", "false", "final", "finally", "float", "for", "goto", "if",
+            "implements", "import", "instanceof", "int", "interface", "long", "native", "new", "null", "package",
+            "private", "protected", "public", "return", "short", "static", "strictfp", "super", "switch",
+            "synchronized", "this", "throw", "throws", "transient", "true", "try", "void", "volatile", "while");
+
+    /**
+     * Static attribute for regex for all the special characters.
+     */
+    public static final String REGEX_WITH_ALL_SPECIAL_CHAR = "\\p{Punct}+";
+
+    /**
+     * Static attribute for regex for three special characters used in identifier.
+     */
+    public static final String REGEX_FOR_IDENTIFIER_SPECIAL_CHAR = "[. _ -]+";
+
+    /**
+     * Static attribute for regex for period.
+     */
+    public static final String REGEX_FOR_PERIOD = "[.]";
+
+    /**
+     * Static attribute for regex for underscore.
+     */
+    public static final String REGEX_FOR_UNDERSCORE = "[_]";
+
+    /**
+     * Static attribute for regex for hyphen.
+     */
+    public static final String REGEX_FOR_HYPHEN = "[-]";
+
+    /**
+     * Static attribute for regex for digits.
+     */
+    public static final String REGEX_FOR_FIRST_DIGIT = "\\d.*";
+
+    /**
+     * Static attribute for regex with digits.
+     */
+    public static final String REGEX_WITH_DIGITS = "(?=\\d+)";
+
+    /**
+     * Static attribute for regex for single letter.
+     */
+    public static final String REGEX_FOR_SINGLE_LETTER = "[a-zA-Z]";
+
+    /**
+     * Static attribute for regex for digits with single letter.
+     */
+    public static final String REGEX_FOR_DIGITS_WITH_SINGLE_LETTER = "[0-9]+[a-zA-Z]";
+
+    /**
+     * Static attribute for regex with uppercase.
+     */
+    public static final String REGEX_WITH_UPPERCASE = "(?=\\p{Upper})";
+
+    /**
+     * Static attribute for regex for single capital case letter.
+     */
+    public static final String REGEX_WITH_SINGLE_CAPITAL_CASE = "[A-Z]";
+
+    /**
+     * Static attribute for regex for capital case letter with any number of digits and small case letters.
+     */
+    public static final String REGEX_WITH_SINGLE_CAPITAL_CASE_AND_DIGITS_SMALL_CASES = "[A-Z][0-9a-z]+";
+
+    /**
+     * Static attribute for regex for any string ending with service.
+     */
+    public static final String REGEX_FOR_ANY_STRING_ENDING_WITH_SERVICE = ".+Service";
+
+    /**
+     * Static attribute for class syntax.
+     */
+    public static final String CLASS = "class";
+
+    /**
+     * Static attribute for builder syntax.
+     */
+    public static final String BUILDER = "Builder";
+
+    /**
+     * Static attribute for manager syntax.
+     */
+    public static final String MANAGER = "Manager";
+
+    /**
+     * Static attribute for service syntax.
+     */
+    public static final String SERVICE = "Service";
+
+    /**
+     * Static attribute for interface syntax.
+     */
+    public static final String INTERFACE = "interface";
+
+    /**
+     * Static attribute for enum syntax.
+     */
+    public static final String ENUM = "enum";
+
+    /**
+     * Static attribute for type syntax.
+     */
+    public static final String TYPE = "Type";
+
+    /**
+     * Static attribute for static syntax.
+     */
+    public static final String STATIC = "static";
+
+    /**
+     * Static attribute for final syntax.
+     */
+    public static final String FINAL = "final";
+
+    /**
+     * Static attribute for package syntax.
+     */
+    public static final String PACKAGE = "package";
+
+    /**
+     * Static attribute for import syntax.
+     */
+    public static final String IMPORT = "import ";
+
+    /**
+     * Static attribute for null syntax.
+     */
+    public static final String NULL = "null";
+
+    /**
+     * Static attribute for return syntax.
+     */
+    public static final String RETURN = "return";
+
+    /**
+     * Static attribute for java new syntax.
+     */
+    public static final String NEW = "new";
+
+    /**
+     * Static attribute for this syntax.
+     */
+    public static final String THIS = "this";
+
+    /**
+     * Static attribute for implements syntax.
+     */
+    public static final String IMPLEMENTS = "implements";
+
+    /**
+     * Static attribute for extends syntax.
+     */
+    public static final String EXTEND = "extends";
+
+    /**
+     * Static attribute for service interface suffix syntax.
+     */
+    public static final String SERVICE_METHOD_STRING = "Service";
+
+    /**
+     * For event file generation.
+     */
+    public static final String EVENT_STRING = "Event";
+
+    /**
+     * For event listener file generation.
+     */
+    public static final String EVENT_LISTENER_STRING = "Listener";
+
+    /**
+     * For event subject file generation.
+     */
+    public static final String EVENT_SUBJECT_NAME_SUFFIX = "EventSubject";
+
+    /**
+     * Static attribute for impl syntax.
+     */
+    public static final String IMPL = "Impl";
+
+    /**
+     * Static attribute for build method syntax.
+     */
+    public static final String BUILD = "build";
+
+    /**
+     * Static attribute for object.
+     */
+    public static final String OBJECT = "Object";
+
+    /**
+     * Static attribute for override annotation.
+     */
+    public static final String OVERRIDE = "@Override";
+
+    /**
+     * Static attribute for new line.
+     */
+    public static final String COLLECTION_IMPORTS = "java.util";
+
+    /**
+     * Static attribute for more object import package.
+     */
+    public static final String GOOGLE_MORE_OBJECT_IMPORT_PKG = "com.google.common.base";
+
+    /**
+     * Static attribute for more object import class.
+     */
+    public static final String GOOGLE_MORE_OBJECT_IMPORT_CLASS = "MoreObjects;\n";
+
+    /**
+     * Static attribute for to string method.
+     */
+    public static final String GOOGLE_MORE_OBJECT_METHOD_STRING = " MoreObjects.toStringHelper(getClass())";
+
+    /**
+     * Static attribute for java utilities import package.
+     */
+    public static final String JAVA_UTIL_OBJECTS_IMPORT_PKG = "java.util";
+
+    /**
+     * Static attribute for java utilities objects import class.
+     */
+    public static final String JAVA_UTIL_OBJECTS_IMPORT_CLASS = "Objects;\n";
+
+    /**
+     * Static attribute for AugmentationHolder class import package.
+     */
+    public static final String PROVIDED_AUGMENTATION_CLASS_IMPORT_PKG =
+            "org.onosproject.yangutils.utils";
+
+    /**
+     * Static attribute for AugmentationHolder class import class.
+     */
+    public static final String AUGMENTATION_HOLDER_CLASS_IMPORT_CLASS = "AugmentationHolder;\n";
+
+    /**
+     * Static attribute for AugmentedInfo class import package.
+     */
+    public static final String AUGMENTED_INFO_CLASS_IMPORT_PKG = "org.onosproject.yangutils.utils";
+
+    /**
+     * Static attribute for AugmentedInfo class import class.
+     */
+    public static final String AUGMENTED_INFO_CLASS_IMPORT_CLASS = "AugmentedInfo;\n";
+
+    /**
+     * Static attribute for augmentation class.
+     */
+    public static final String AUGMENTATION = "Augmentation";
+
+    /**
+     * Static attribute for AugmentationHolder class.
+     */
+    public static final String AUGMENTATION_HOLDER = "AugmentationHolder";
+
+    /**
+     * Static attribute for AugmentedInfo class.
+     */
+    public static final String AUGMENTED_INFO = "AugmentedInfo";
+
+    /**
+     * Static attribute for augmentable.
+     */
+    public static final String AUGMENTABLE = "Augmentable";
+
+    /**
+     * Static attribute for list.
+     */
+    public static final String LIST = "List";
+
+    /**
+     * Static attribute for array list.
+     */
+    public static final String ARRAY_LIST = "ArrayList";
+
+    /**
+     * Comment to be added for autogenerated impl methods.
+     */
+    public static final String YANG_UTILS_TODO = "//TODO: YANG utils generated code";
+
+    /**
+     * Static attribute for activate annotation.
+     */
+    public static final String ACTIVATE_ANNOTATION = "@Activate\n";
+
+    /**
+     * Static attribute for activate.
+     */
+    public static final String ACTIVATE = "activate";
+
+    /**
+     * Static attribute for activate annotation import.
+     */
+    public static final String ACTIVATE_ANNOTATION_IMPORT = "import org.apache.felix.scr.annotations.Activate;\n";
+
+    /**
+     * Static attribute for deactivate annotation.
+     */
+    public static final String DEACTIVATE_ANNOTATION = "@Deactivate\n";
+
+    /**
+     * Static attribute for deactivate.
+     */
+    public static final String DEACTIVATE = "deactivate";
+
+    /**
+     * Static attribute for deactivate annotation import.
+     */
+    public static final String DEACTIVATE_ANNOTATION_IMPORT =
+            "import org.apache.felix.scr.annotations.Deactivate;\n";
+
+    /**
+     * Static attribute for component annotation.
+     */
+    public static final String COMPONENT_ANNOTATION = "@Component";
+
+    /**
+     * Static attribute for component.
+     */
+    public static final String COMPONENT = "Component";
+
+    /**
+     * Static attribute for immediate.
+     */
+    public static final String IMMEDIATE = "immediate";
+
+    /**
+     * Static attribute for component annotation import.
+     */
+    public static final String COMPONENT_ANNOTATION_IMPORT =
+            "import org.apache.felix.scr.annotations.Component;\n";
+
+    /**
+     * Static attribute for service annotation.
+     */
+    public static final String SERVICE_ANNOTATION = "@Service\n";
+
+    /**
+     * Static attribute for service annotation import.
+     */
+    public static final String SERVICE_ANNOTATION_IMPORT =
+            "import org.apache.felix.scr.annotations.Service;\n";
+
+    /**
+     * Static attribute for logger factory import.
+     */
+    public static final String LOGGER_FACTORY_IMPORT =
+            "import static org.slf4j.LoggerFactory.getLogger;\n";
+
+    /**
+     * Static attribute for logger import.
+     */
+    public static final String LOGGER_IMPORT =
+            "import org.slf4j.Logger;\n";
+
+    /**
+     * Static attribute for logger statement.
+     */
+    public static final String LOGGER_STATEMENT =
+            "\n    private final Logger log = getLogger(getClass());\n";
+
+    /**
+     * Static attribute for logger statement for started.
+     */
+    public static final String STARTED_LOG_INFO =
+            "log.info(\"Started\");\n";
+
+    /**
+     * Static attribute for logger statement for stopped.
+     */
+    public static final String STOPPED_LOG_INFO =
+            "log.info(\"Stopped\");\n";
+
+    /**
+     * Static attribute for AbstractEvent.
+     */
+    public static final String ABSTRACT_EVENT = "AbstractEvent";
+
+    /**
+     * Static attribute for EventListener.
+     */
+    public static final String EVENT_LISTENER = "EventListener";
+
+    /**
+     * Static attribute for YangBinary class.
+     */
+    public static final String YANG_BINARY_CLASS = "YangBinary";
+
+    /**
+     * Static attribute for YangBinary class.
+     */
+    public static final String YANG_BITS_CLASS = "YangBits";
+
+    /**
+     * Static attribute for YANG types package.
+     */
+    public static final String YANG_TYPES_PKG = "org.onosproject.yangutils.datamodel.utils.builtindatatype";
+
+    /**
+     * Static attribute for MathContext class.
+     */
+    public static final String MATH_CONTEXT = "MathContext";
+
+    /**
+     * Static attribute for DECIMAL64 class.
+     */
+    public static final String YANG_DECIMAL64_CLASS = "YangDecimal64";
+
+
+    /**
+     * Static attribute for YANG file error.
+     */
+    public static final String YANG_FILE_ERROR = "YANG file error : ";
+
+    /**
+     * Static attribute for unsupported error information.
+     */
+    public static final String UNSUPPORTED_YANG_CONSTRUCT = " is not supported.";
+
+    /**
+     * Static attribute for currently unsupported error information.
+     */
+    public static final String CURRENTLY_UNSUPPORTED = " is not supported in current version, please check wiki" +
+            " for YANG utils road map.";
+
+    /**
+     * Static attribute for typedef linker error information.
+     */
+    public static final String TYPEDEF_LINKER_ERROR = "YANG file error: Unable to find base "
+            + "typedef for given type";
+
+    /**
+     * Static attribute for grouping linker error information.
+     */
+    public static final String GROUPING_LINKER_ERROR = "YANG file error: Unable to find base "
+            + "grouping for given uses";
+
+    /**
+     * Static attribute for reference.
+     */
+    public static final String REFERENCE = "Reference";
+
+    /**
+     * Static attribute for ReferenceCardinality.
+     */
+    public static final String REFERENCE_CARDINALITY = "ReferenceCardinality";
+
+    /**
+     * Static attribute for jar.
+     */
+    public static final String JAR = "jar";
+
+    /**
+     * Creates an instance of util constants.
+     */
+    private UtilConstants() {
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/utils/io/impl/CopyrightHeader.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/utils/io/impl/CopyrightHeader.java
new file mode 100644
index 0000000..5833de2
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/utils/io/impl/CopyrightHeader.java
@@ -0,0 +1,129 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.utils.io.impl;
+
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileOutputStream;
+import java.io.FileReader;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.OutputStream;
+import java.util.Calendar;
+
+import static org.onosproject.yangutils.utils.UtilConstants.NEW_LINE;
+
+/**
+ * Represents the license header for the generated files.
+ */
+public final class CopyrightHeader {
+
+    private static final int EOF = -1;
+    private static final String COPYRIGHT_HEADER_FILE = "CopyrightHeader.txt";
+    private static final String COPYRIGHTS_FIRST_LINE = "/*\n * Copyright " + Calendar.getInstance().get(Calendar.YEAR)
+            + "-present Open Networking Laboratory\n";
+    private static final String TEMP_FILE = "temp.txt";
+    private static ClassLoader classLoader = CopyrightHeader.class.getClassLoader();
+
+    private static String copyrightHeader;
+
+    /**
+     * Creates an instance of copyright header.
+     */
+    private CopyrightHeader() {
+    }
+
+    /**
+     * Returns copyright file header.
+     *
+     * @return copyright file header
+     * @throws IOException when fails to parse copyright header
+     */
+    public static String getCopyrightHeader() throws IOException {
+
+        if (copyrightHeader == null) {
+            parseCopyrightHeader();
+        }
+        return copyrightHeader;
+    }
+
+    /**
+     * Sets the copyright header.
+     *
+     * @param header copyright header
+     */
+    private static void setCopyrightHeader(String header) {
+
+        copyrightHeader = header;
+    }
+
+    /**
+     * parses Copyright to the temporary file.
+     *
+     * @throws IOException when fails to get the copyright header
+     */
+    private static void parseCopyrightHeader() throws IOException {
+
+        File temp = new File(TEMP_FILE);
+
+        try {
+            InputStream stream = classLoader.getResourceAsStream(COPYRIGHT_HEADER_FILE);
+            OutputStream out = new FileOutputStream(temp);
+
+            int index;
+            out.write(COPYRIGHTS_FIRST_LINE.getBytes());
+            while ((index = stream.read()) != EOF) {
+                out.write(index);
+            }
+            out.close();
+            stream.close();
+            getStringFileContent(temp);
+            setCopyrightHeader(getStringFileContent(temp));
+        } catch (IOException e) {
+            throw new IOException("failed to parse the Copyright header");
+        } finally {
+            temp.delete();
+        }
+    }
+
+    /**
+     * Converts it to string.
+     *
+     * @param toAppend file to be converted.
+     * @return string of file.
+     * @throws IOException when fails to convert to string
+     */
+    private static String getStringFileContent(File toAppend) throws IOException {
+
+        FileReader fileReader = new FileReader(toAppend);
+        BufferedReader bufferReader = new BufferedReader(fileReader);
+        try {
+            StringBuilder stringBuilder = new StringBuilder();
+            String line = bufferReader.readLine();
+
+            while (line != null) {
+                stringBuilder.append(line);
+                stringBuilder.append(NEW_LINE);
+                line = bufferReader.readLine();
+            }
+            return stringBuilder.toString();
+        } finally {
+            fileReader.close();
+            bufferReader.close();
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/utils/io/impl/FileSystemUtil.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/utils/io/impl/FileSystemUtil.java
new file mode 100644
index 0000000..7ae17d4
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/utils/io/impl/FileSystemUtil.java
@@ -0,0 +1,182 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.utils.io.impl;
+
+import java.io.BufferedReader;
+import java.io.File;
+import java.io.FileReader;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.io.PrintWriter;
+import java.util.ArrayList;
+import java.util.List;
+
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.translator.exception.TranslatorException;
+import org.onosproject.yangutils.translator.tojava.JavaFileInfo;
+import org.onosproject.yangutils.translator.tojava.JavaFileInfoContainer;
+
+import static org.onosproject.yangutils.datamodel.utils.DataModelUtils.getParentNodeInGenCode;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaIdentifierSyntax.getJavaPackageFromPackagePath;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaIdentifierSyntax.getPackageDirPathFromJavaJPackage;
+import static org.onosproject.yangutils.utils.UtilConstants.EIGHT_SPACE_INDENTATION;
+import static org.onosproject.yangutils.utils.UtilConstants.EMPTY_STRING;
+import static org.onosproject.yangutils.utils.UtilConstants.FOUR_SPACE_INDENTATION;
+import static org.onosproject.yangutils.utils.UtilConstants.MULTIPLE_NEW_LINE;
+import static org.onosproject.yangutils.utils.UtilConstants.NEW_LINE;
+import static org.onosproject.yangutils.utils.UtilConstants.SLASH;
+import static org.onosproject.yangutils.utils.UtilConstants.SPACE;
+import static org.onosproject.yangutils.utils.io.impl.YangIoUtils.addPackageInfo;
+import static org.onosproject.yangutils.utils.io.impl.YangIoUtils.createDirectories;
+import static org.onosproject.yangutils.utils.io.impl.YangIoUtils.getAbsolutePackagePath;
+
+/**
+ * Represents utility to handle file system operations.
+ */
+public final class FileSystemUtil {
+
+    /**
+     * Creates an instance of file system util.
+     */
+    private FileSystemUtil() {
+    }
+
+    /**
+     * Checks if the package directory structure created.
+     *
+     * @param pkg Package to check if it is created
+     * @return existence status of package
+     */
+    public static boolean doesPackageExist(String pkg) {
+        File pkgDir = new File(getPackageDirPathFromJavaJPackage(pkg));
+        File pkgWithFile = new File(pkgDir + SLASH + "package-info.java");
+        return pkgDir.exists() && pkgWithFile.isFile();
+    }
+
+    /**
+     * Creates a package structure with package info java file if not present.
+     *
+     * @param yangNode YANG node for which code is being generated
+     * @throws IOException any IO exception
+     */
+    public static void createPackage(YangNode yangNode) throws IOException {
+        if (!(yangNode instanceof JavaFileInfoContainer)) {
+            throw new TranslatorException("current node must have java file info");
+        }
+        String pkgInfo;
+        JavaFileInfo javaFileInfo = ((JavaFileInfoContainer) yangNode).getJavaFileInfo();
+        String pkg = getAbsolutePackagePath(javaFileInfo.getBaseCodeGenPath(), javaFileInfo.getPackageFilePath());
+        if (!doesPackageExist(pkg)) {
+            try {
+                File pack = createDirectories(pkg);
+                YangNode parent = getParentNodeInGenCode(yangNode);
+                if (parent != null) {
+                    pkgInfo = ((JavaFileInfoContainer) parent).getJavaFileInfo().getJavaName();
+                    addPackageInfo(pack, pkgInfo, getJavaPackageFromPackagePath(pkg), true,
+                            ((JavaFileInfoContainer) parent).getJavaFileInfo().getPluginConfig());
+                } else {
+                    pkgInfo = ((JavaFileInfoContainer) yangNode).getJavaFileInfo().getJavaName();
+                    addPackageInfo(pack, pkgInfo, getJavaPackageFromPackagePath(pkg), false,
+                            ((JavaFileInfoContainer) yangNode).getJavaFileInfo().getPluginConfig());
+                }
+            } catch (IOException e) {
+                throw new IOException("failed to create package-info file");
+            }
+        }
+    }
+
+    /**
+     * Reads the contents from source file and append its contents to append
+     * file.
+     *
+     * @param toAppend destination file in which the contents of source file is
+     * appended
+     * @param srcFile source file from which data is read and added to to append
+     * file
+     * @throws IOException any IO errors
+     */
+    public static void appendFileContents(File toAppend, File srcFile)
+            throws IOException {
+        updateFileHandle(srcFile, NEW_LINE + readAppendFile(toAppend.toString(), FOUR_SPACE_INDENTATION), false);
+    }
+
+    /**
+     * Reads file and convert it to string.
+     *
+     * @param toAppend file to be converted
+     * @param spaces spaces to be appended
+     * @return string of file
+     * @throws IOException when fails to convert to string
+     */
+    public static String readAppendFile(String toAppend, String spaces)
+            throws IOException {
+
+        FileReader fileReader = new FileReader(toAppend);
+        BufferedReader bufferReader = new BufferedReader(fileReader);
+        try {
+            StringBuilder stringBuilder = new StringBuilder();
+            String line = bufferReader.readLine();
+
+            while (line != null) {
+                if (line.equals(SPACE) || line.equals(EMPTY_STRING) || line.equals(EIGHT_SPACE_INDENTATION)
+                        || line.equals(MULTIPLE_NEW_LINE)) {
+                    stringBuilder.append(NEW_LINE);
+                } else if (line.equals(FOUR_SPACE_INDENTATION)) {
+                    stringBuilder.append(EMPTY_STRING);
+                } else {
+                    stringBuilder.append(spaces + line);
+                    stringBuilder.append(NEW_LINE);
+                }
+                line = bufferReader.readLine();
+            }
+            return stringBuilder.toString();
+        } finally {
+            fileReader.close();
+            bufferReader.close();
+        }
+    }
+
+    /**
+     * Updates the generated file handle.
+     *
+     * @param inputFile input file
+     * @param contentTobeAdded content to be appended to the file
+     * @param isClose when close of file is called.
+     * @throws IOException if the named file exists but is a directory rather than a regular file,
+     *                     does not exist but cannot be created, or cannot be opened for any other reason
+     */
+    public static void updateFileHandle(File inputFile, String contentTobeAdded, boolean isClose)
+            throws IOException {
+
+        List<FileWriter> fileWriterStore = new ArrayList<>();
+
+        FileWriter fileWriter = new FileWriter(inputFile, true);
+        fileWriterStore.add(fileWriter);
+        PrintWriter outputPrintWriter = new PrintWriter(fileWriter, true);
+        if (!isClose) {
+            outputPrintWriter.write(contentTobeAdded);
+            outputPrintWriter.flush();
+            outputPrintWriter.close();
+        } else {
+            for (FileWriter curWriter : fileWriterStore) {
+                curWriter.flush();
+                curWriter.close();
+                curWriter = null;
+            }
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/utils/io/impl/JavaDocGen.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/utils/io/impl/JavaDocGen.java
new file mode 100644
index 0000000..fb8f981
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/utils/io/impl/JavaDocGen.java
@@ -0,0 +1,602 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.utils.io.impl;
+
+import org.onosproject.yangutils.translator.tojava.utils.JavaIdentifierSyntax;
+import org.onosproject.yangutils.translator.tojava.utils.YangPluginConfig;
+
+import static org.onosproject.yangutils.translator.tojava.utils.JavaIdentifierSyntax.getCamelCase;
+import static org.onosproject.yangutils.utils.UtilConstants.BUILDER;
+import static org.onosproject.yangutils.utils.UtilConstants.BUILDER_CLASS_JAVA_DOC;
+import static org.onosproject.yangutils.utils.UtilConstants.BUILDER_INTERFACE_JAVA_DOC;
+import static org.onosproject.yangutils.utils.UtilConstants.BUILDER_OBJECT;
+import static org.onosproject.yangutils.utils.UtilConstants.EMPTY_STRING;
+import static org.onosproject.yangutils.utils.UtilConstants.ENUM_ATTRIBUTE_JAVADOC;
+import static org.onosproject.yangutils.utils.UtilConstants.ENUM_CLASS_JAVADOC;
+import static org.onosproject.yangutils.utils.UtilConstants.EVENT_JAVA_DOC;
+import static org.onosproject.yangutils.utils.UtilConstants.EVENT_LISTENER_JAVA_DOC;
+import static org.onosproject.yangutils.utils.UtilConstants.FOUR_SPACE_INDENTATION;
+import static org.onosproject.yangutils.utils.UtilConstants.FROM_STRING_METHOD_NAME;
+import static org.onosproject.yangutils.utils.UtilConstants.FROM_STRING_PARAM_NAME;
+import static org.onosproject.yangutils.utils.UtilConstants.IMPL;
+import static org.onosproject.yangutils.utils.UtilConstants.IMPL_CLASS_JAVA_DOC;
+import static org.onosproject.yangutils.utils.UtilConstants.INPUT;
+import static org.onosproject.yangutils.utils.UtilConstants.INTERFACE_JAVA_DOC;
+import static org.onosproject.yangutils.utils.UtilConstants.JAVA_DOC_BUILD;
+import static org.onosproject.yangutils.utils.UtilConstants.JAVA_DOC_BUILD_RETURN;
+import static org.onosproject.yangutils.utils.UtilConstants.JAVA_DOC_CONSTRUCTOR;
+import static org.onosproject.yangutils.utils.UtilConstants.JAVA_DOC_END_LINE;
+import static org.onosproject.yangutils.utils.UtilConstants.JAVA_DOC_FIRST_LINE;
+import static org.onosproject.yangutils.utils.UtilConstants.JAVA_DOC_GETTERS;
+import static org.onosproject.yangutils.utils.UtilConstants.JAVA_DOC_MANAGER_SETTERS;
+import static org.onosproject.yangutils.utils.UtilConstants.JAVA_DOC_OF;
+import static org.onosproject.yangutils.utils.UtilConstants.JAVA_DOC_PARAM;
+import static org.onosproject.yangutils.utils.UtilConstants.JAVA_DOC_RETURN;
+import static org.onosproject.yangutils.utils.UtilConstants.JAVA_DOC_RPC;
+import static org.onosproject.yangutils.utils.UtilConstants.JAVA_DOC_SETTERS;
+import static org.onosproject.yangutils.utils.UtilConstants.JAVA_DOC_SETTERS_COMMON;
+import static org.onosproject.yangutils.utils.UtilConstants.LIST;
+import static org.onosproject.yangutils.utils.UtilConstants.NEW_LINE;
+import static org.onosproject.yangutils.utils.UtilConstants.NEW_LINE_ASTERISK;
+import static org.onosproject.yangutils.utils.UtilConstants.OBJECT;
+import static org.onosproject.yangutils.utils.UtilConstants.OF;
+import static org.onosproject.yangutils.utils.UtilConstants.PACKAGE_INFO_JAVADOC;
+import static org.onosproject.yangutils.utils.UtilConstants.PACKAGE_INFO_JAVADOC_OF_CHILD;
+import static org.onosproject.yangutils.utils.UtilConstants.PERIOD;
+import static org.onosproject.yangutils.utils.UtilConstants.RPC_INPUT_STRING;
+import static org.onosproject.yangutils.utils.UtilConstants.RPC_OUTPUT_STRING;
+import static org.onosproject.yangutils.utils.UtilConstants.SPACE;
+import static org.onosproject.yangutils.utils.UtilConstants.STRING_DATA_TYPE;
+import static org.onosproject.yangutils.utils.UtilConstants.VALUE;
+import static org.onosproject.yangutils.utils.UtilConstants.VOID;
+
+/**
+ * Represents javadoc for the generated classes.
+ */
+public final class JavaDocGen {
+
+    /**
+     * Creates an instance of java doc gen.
+     */
+    private JavaDocGen() {
+    }
+
+    /**
+     * JavaDocs types.
+     */
+    public enum JavaDocType {
+
+        /**
+         * For class.
+         */
+        IMPL_CLASS,
+
+        /**
+         * For builder class.
+         */
+        BUILDER_CLASS,
+
+        /**
+         * For interface.
+         */
+        INTERFACE,
+
+        /**
+         * For builder interface.
+         */
+        BUILDER_INTERFACE,
+
+        /**
+         * For package-info.
+         */
+        PACKAGE_INFO,
+
+        /**
+         * For getters.
+         */
+        GETTER_METHOD,
+
+        /**
+         * For rpc service.
+         */
+        RPC_INTERFACE,
+
+        /**
+         * For rpc manager.
+         */
+        RPC_MANAGER,
+
+        /**
+         * For event.
+         */
+        EVENT,
+
+        /**
+         * For event listener.
+         */
+        EVENT_LISTENER,
+
+        /**
+         * For setters.
+         */
+        SETTER_METHOD,
+
+        /**
+         * For type def's setters.
+         */
+        TYPE_DEF_SETTER_METHOD,
+
+        /**
+         * For of method.
+         */
+        OF_METHOD,
+
+        /**
+         * For default constructor.
+         */
+        DEFAULT_CONSTRUCTOR,
+
+        /**
+         * For constructor.
+         */
+        CONSTRUCTOR,
+
+        /**
+         * For from method.
+         */
+        FROM_METHOD,
+
+        /**
+         * For type constructor.
+         */
+        TYPE_CONSTRUCTOR,
+
+        /**
+         * For build.
+         */
+        BUILD_METHOD,
+
+        /**
+         * For enum.
+         */
+        ENUM_CLASS,
+
+        /**
+         * For enum's attributes.
+         */
+        ENUM_ATTRIBUTE,
+
+        /**
+         * For manager setters.
+         */
+        MANAGER_SETTER_METHOD,
+
+        /**
+         * For event subject.
+         */
+        EVENT_SUBJECT_CLASS
+    }
+
+    /**
+     * Returns java docs.
+     *
+     * @param type java doc type
+     * @param name name of the YangNode
+     * @param isList is list attribute
+     * @param pluginConfig plugin configurations
+     * @return javadocs.
+     */
+    public static String getJavaDoc(JavaDocType type, String name, boolean isList, YangPluginConfig pluginConfig) {
+
+        name = JavaIdentifierSyntax.getSmallCase(getCamelCase(name, pluginConfig.getConflictResolver()));
+        switch (type) {
+            case IMPL_CLASS: {
+                return generateForClass(name);
+            }
+            case BUILDER_CLASS: {
+                return generateForBuilderClass(name);
+            }
+            case INTERFACE: {
+                return generateForInterface(name);
+            }
+            case BUILDER_INTERFACE: {
+                return generateForBuilderInterface(name);
+            }
+            case PACKAGE_INFO: {
+                return generateForPackage(name, isList);
+            }
+            case GETTER_METHOD: {
+                return generateForGetters(name, isList);
+            }
+            case TYPE_DEF_SETTER_METHOD: {
+                return generateForTypeDefSetter(name);
+            }
+            case SETTER_METHOD: {
+                return generateForSetters(name, isList);
+            }
+            case MANAGER_SETTER_METHOD: {
+                return generateForManagerSetters(name, isList);
+            }
+            case OF_METHOD: {
+                return generateForOf(name);
+            }
+            case DEFAULT_CONSTRUCTOR: {
+                return generateForDefaultConstructors(name);
+            }
+            case BUILD_METHOD: {
+                return generateForBuild(name);
+            }
+            case TYPE_CONSTRUCTOR: {
+                return generateForTypeConstructor(name);
+            }
+            case FROM_METHOD: {
+                return generateForFromString(name);
+            }
+            case ENUM_CLASS: {
+                return generateForEnum(name);
+            }
+            case ENUM_ATTRIBUTE: {
+                return generateForEnumAttr(name);
+            }
+            case RPC_INTERFACE: {
+               return generateForRpcService(name);
+            }
+            case RPC_MANAGER: {
+               return generateForClass(name);
+            }
+            case EVENT: {
+                return generateForEvent(name);
+            }
+            case EVENT_LISTENER: {
+                return generateForEventListener(name);
+            }
+            case EVENT_SUBJECT_CLASS: {
+                return generateForClass(name);
+            }
+            default: {
+                return generateForConstructors(name);
+            }
+        }
+    }
+
+    /**
+     * Generates javaDocs for enum's attributes.
+     *
+     * @param name attribute name
+     * @return javaDocs
+     */
+    private static String generateForEnumAttr(String name) {
+        return NEW_LINE + FOUR_SPACE_INDENTATION + JAVA_DOC_FIRST_LINE + FOUR_SPACE_INDENTATION + ENUM_ATTRIBUTE_JAVADOC
+                + name + PERIOD + NEW_LINE + FOUR_SPACE_INDENTATION + JAVA_DOC_END_LINE;
+    }
+
+    /**
+     * Generates javaDocs for rpc method.
+     *
+     * @param rpcName name of the rpc
+     * @param inputName name of input
+     * @param outputName name of output
+     * @param pluginConfig plugin configurations
+     * @return javaDocs of rpc method
+     */
+    public static String generateJavaDocForRpc(String rpcName, String inputName, String outputName,
+            YangPluginConfig pluginConfig) {
+        rpcName = getCamelCase(rpcName, pluginConfig.getConflictResolver());
+
+        String javadoc =
+                NEW_LINE + FOUR_SPACE_INDENTATION + JAVA_DOC_FIRST_LINE + FOUR_SPACE_INDENTATION + JAVA_DOC_RPC
+                        + rpcName + PERIOD + NEW_LINE + FOUR_SPACE_INDENTATION + NEW_LINE_ASTERISK;
+        if (!inputName.equals(EMPTY_STRING)) {
+            javadoc = javadoc + getInputString(inputName, rpcName);
+        }
+        if (!outputName.equals(VOID)) {
+            javadoc = javadoc + getOutputString(outputName, rpcName);
+        }
+        return javadoc + FOUR_SPACE_INDENTATION + JAVA_DOC_END_LINE;
+    }
+
+    /**
+     * Returns output string of rpc.
+     *
+     * @param outputName name of output
+     * @param rpcName name of rpc
+     * @return javaDocs for output string of rpc
+     */
+    private static String getOutputString(String outputName, String rpcName) {
+        return FOUR_SPACE_INDENTATION + JAVA_DOC_RETURN + outputName + SPACE + RPC_OUTPUT_STRING + rpcName + NEW_LINE;
+    }
+
+    /**
+     * Returns input string of rpc.
+     *
+     * @param inputName name of input
+     * @param rpcName name of rpc
+     * @return javaDocs for input string of rpc
+     */
+    private static String getInputString(String inputName, String rpcName) {
+        if (inputName.equals("")) {
+            return null;
+        } else {
+            return FOUR_SPACE_INDENTATION + JAVA_DOC_PARAM + inputName + SPACE + RPC_INPUT_STRING + rpcName + NEW_LINE;
+        }
+    }
+
+    /**
+     * Generates javaDoc for the interface.
+     *
+     * @param interfaceName interface name
+     * @return javaDocs
+     */
+    private static String generateForRpcService(String interfaceName) {
+        return NEW_LINE + JAVA_DOC_FIRST_LINE + INTERFACE_JAVA_DOC + interfaceName + PERIOD + NEW_LINE
+                + JAVA_DOC_END_LINE;
+    }
+
+    /**
+     * Generates javaDoc for the event.
+     *
+     * @param eventClassName event class name
+     * @return javaDocs
+     */
+    private static String generateForEvent(String eventClassName) {
+        return NEW_LINE + JAVA_DOC_FIRST_LINE + EVENT_JAVA_DOC + eventClassName + PERIOD + NEW_LINE
+                + JAVA_DOC_END_LINE;
+    }
+
+    /**
+     * Generates javaDoc for the event listener.
+     *
+     * @param eventListenerInterfaceName event class name
+     * @return javaDocs
+     */
+    private static String generateForEventListener(String eventListenerInterfaceName) {
+        return NEW_LINE + JAVA_DOC_FIRST_LINE + EVENT_LISTENER_JAVA_DOC + eventListenerInterfaceName
+                + PERIOD + NEW_LINE + JAVA_DOC_END_LINE;
+    }
+
+    /**
+     * Generates javaDocs for getter method.
+     *
+     * @param attribute attribute
+     * @param isList is list attribute
+     * @return javaDocs
+     */
+    private static String generateForGetters(String attribute, boolean isList) {
+
+        String getter = NEW_LINE + FOUR_SPACE_INDENTATION + JAVA_DOC_FIRST_LINE + FOUR_SPACE_INDENTATION
+                + JAVA_DOC_GETTERS + attribute + PERIOD + NEW_LINE + FOUR_SPACE_INDENTATION + NEW_LINE_ASTERISK
+                + FOUR_SPACE_INDENTATION + JAVA_DOC_RETURN;
+        if (isList) {
+            String listAttribute = LIST.toLowerCase() + SPACE + OF + SPACE;
+            getter = getter + listAttribute;
+        } else {
+            getter = getter + VALUE + SPACE + OF + SPACE;
+        }
+
+        getter = getter + attribute + NEW_LINE + FOUR_SPACE_INDENTATION + JAVA_DOC_END_LINE;
+        return getter;
+    }
+
+    /**
+     * Generates javaDocs for setter method.
+     *
+     * @param attribute attribute
+     * @param isList is list attribute
+     * @return javaDocs
+     */
+    private static String generateForSetters(String attribute, boolean isList) {
+
+        String setter = NEW_LINE + FOUR_SPACE_INDENTATION + JAVA_DOC_FIRST_LINE + FOUR_SPACE_INDENTATION
+                + JAVA_DOC_SETTERS + attribute + PERIOD + NEW_LINE + FOUR_SPACE_INDENTATION + NEW_LINE_ASTERISK
+                + FOUR_SPACE_INDENTATION + JAVA_DOC_PARAM + attribute + SPACE;
+        if (isList) {
+            String listAttribute = LIST.toLowerCase() + SPACE + OF + SPACE;
+            setter = setter + listAttribute;
+        } else {
+            setter = setter + VALUE + SPACE + OF + SPACE;
+        }
+        setter = setter + attribute + NEW_LINE + FOUR_SPACE_INDENTATION + JAVA_DOC_RETURN + BUILDER_OBJECT
+                + attribute
+                + NEW_LINE + FOUR_SPACE_INDENTATION + JAVA_DOC_END_LINE;
+        return setter;
+    }
+
+    /**
+     * Generates javaDocs for setter method.
+     *
+     * @param attribute attribute
+     * @param isList is list attribute
+     * @return javaDocs
+     */
+    private static String generateForManagerSetters(String attribute, boolean isList) {
+
+        String setter = NEW_LINE + FOUR_SPACE_INDENTATION + JAVA_DOC_FIRST_LINE + FOUR_SPACE_INDENTATION
+                + JAVA_DOC_MANAGER_SETTERS + attribute + PERIOD + NEW_LINE + FOUR_SPACE_INDENTATION + NEW_LINE_ASTERISK
+                + FOUR_SPACE_INDENTATION + JAVA_DOC_PARAM + attribute + SPACE;
+        if (isList) {
+            String listAttribute = LIST.toLowerCase() + SPACE + OF + SPACE;
+            setter = setter + listAttribute;
+        } else {
+            setter = setter + VALUE + SPACE + OF + SPACE;
+        }
+        setter = setter + attribute
+                + NEW_LINE + FOUR_SPACE_INDENTATION + JAVA_DOC_END_LINE;
+        return setter;
+    }
+
+    /**
+     * Generates javaDocs for of method.
+     *
+     * @param attribute attribute
+     * @return javaDocs
+     */
+    private static String generateForOf(String attribute) {
+        return NEW_LINE + FOUR_SPACE_INDENTATION + JAVA_DOC_FIRST_LINE + FOUR_SPACE_INDENTATION + JAVA_DOC_OF
+                + attribute + PERIOD + NEW_LINE + FOUR_SPACE_INDENTATION + NEW_LINE_ASTERISK + FOUR_SPACE_INDENTATION
+                + JAVA_DOC_PARAM + VALUE + SPACE + VALUE + SPACE + OF + SPACE + attribute + NEW_LINE
+                + FOUR_SPACE_INDENTATION + JAVA_DOC_RETURN + OBJECT + SPACE + OF + SPACE + attribute + NEW_LINE
+                + FOUR_SPACE_INDENTATION + JAVA_DOC_END_LINE;
+    }
+
+    /**
+     * Generates javaDocs for from method.
+     *
+     * @param attribute attribute
+     * @return javaDocs
+     */
+    private static String generateForFromString(String attribute) {
+
+        return NEW_LINE + FOUR_SPACE_INDENTATION + JAVA_DOC_FIRST_LINE + FOUR_SPACE_INDENTATION + JAVA_DOC_OF
+                + attribute + SPACE + FROM_STRING_METHOD_NAME + SPACE + INPUT + SPACE + STRING_DATA_TYPE + PERIOD
+                + NEW_LINE + FOUR_SPACE_INDENTATION + NEW_LINE_ASTERISK + FOUR_SPACE_INDENTATION + JAVA_DOC_PARAM
+                + FROM_STRING_PARAM_NAME + SPACE + INPUT + SPACE + STRING_DATA_TYPE + NEW_LINE
+                + FOUR_SPACE_INDENTATION + JAVA_DOC_RETURN + OBJECT + SPACE + OF + SPACE + attribute + NEW_LINE
+                + FOUR_SPACE_INDENTATION + JAVA_DOC_END_LINE;
+    }
+
+    /**
+     * Generates javaDocs for typedef setter method.
+     *
+     * @param attribute attribute
+     * @return javaDocs
+     */
+    private static String generateForTypeDefSetter(String attribute) {
+        return NEW_LINE + FOUR_SPACE_INDENTATION + JAVA_DOC_FIRST_LINE + FOUR_SPACE_INDENTATION
+                + JAVA_DOC_SETTERS_COMMON + attribute + PERIOD + NEW_LINE + FOUR_SPACE_INDENTATION + NEW_LINE_ASTERISK
+                + FOUR_SPACE_INDENTATION + JAVA_DOC_PARAM + VALUE + SPACE + VALUE + SPACE + OF + SPACE + attribute
+                + NEW_LINE + FOUR_SPACE_INDENTATION + JAVA_DOC_END_LINE;
+    }
+
+    /**
+     * Generates javaDocs for the impl class.
+     *
+     * @param className class name
+     * @return javaDocs
+     */
+    private static String generateForClass(String className) {
+        return NEW_LINE + JAVA_DOC_FIRST_LINE + IMPL_CLASS_JAVA_DOC + className + PERIOD + NEW_LINE + JAVA_DOC_END_LINE;
+    }
+
+    /**
+     * Generates javaDocs for enum.
+     *
+     * @param className enum class name
+     * @return javaDocs
+     */
+    private static String generateForEnum(String className) {
+        return NEW_LINE + NEW_LINE + JAVA_DOC_FIRST_LINE + ENUM_CLASS_JAVADOC + className + PERIOD + NEW_LINE
+                + JAVA_DOC_END_LINE;
+    }
+
+    /**
+     * Generates javaDocs for the builder class.
+     *
+     * @param className class name
+     * @return javaDocs
+     */
+    private static String generateForBuilderClass(String className) {
+        return NEW_LINE + JAVA_DOC_FIRST_LINE + BUILDER_CLASS_JAVA_DOC + className + PERIOD + NEW_LINE
+                + JAVA_DOC_END_LINE;
+    }
+
+    /**
+     * Generates javaDoc for the interface.
+     *
+     * @param interfaceName interface name
+     * @return javaDocs
+     */
+    private static String generateForInterface(String interfaceName) {
+        return NEW_LINE + JAVA_DOC_FIRST_LINE + INTERFACE_JAVA_DOC + interfaceName + PERIOD + NEW_LINE
+                + JAVA_DOC_END_LINE;
+    }
+
+    /**
+     * Generates javaDoc for the builder interface.
+     *
+     * @param builderforName builder for name
+     * @return javaDocs
+     */
+    private static String generateForBuilderInterface(String builderforName) {
+        return JAVA_DOC_FIRST_LINE + BUILDER_INTERFACE_JAVA_DOC + builderforName + PERIOD + NEW_LINE
+                + JAVA_DOC_END_LINE;
+    }
+
+    /**
+     * Generates javaDocs for package-info.
+     *
+     * @param packageName package name
+     * @param isChildNode is it child node
+     * @return javaDocs
+     */
+    private static String generateForPackage(String packageName, boolean isChildNode) {
+        String javaDoc = JAVA_DOC_FIRST_LINE + PACKAGE_INFO_JAVADOC + packageName;
+        if (isChildNode) {
+            javaDoc = javaDoc + PACKAGE_INFO_JAVADOC_OF_CHILD;
+        }
+        return javaDoc + PERIOD + NEW_LINE + JAVA_DOC_END_LINE;
+    }
+
+    /**
+     * Generates javaDocs for default constructor.
+     *
+     * @param className class name
+     * @return javaDocs
+     */
+    private static String generateForDefaultConstructors(String className) {
+        return FOUR_SPACE_INDENTATION + JAVA_DOC_FIRST_LINE + FOUR_SPACE_INDENTATION + JAVA_DOC_CONSTRUCTOR + className
+                + PERIOD + NEW_LINE + FOUR_SPACE_INDENTATION + JAVA_DOC_END_LINE;
+    }
+
+    /**
+     * Generates javaDocs for constructor with parameters.
+     *
+     * @param className class name
+     * @return javaDocs
+     */
+    private static String generateForConstructors(String className) {
+        return NEW_LINE + FOUR_SPACE_INDENTATION + JAVA_DOC_FIRST_LINE + FOUR_SPACE_INDENTATION + JAVA_DOC_CONSTRUCTOR
+                + className + IMPL + PERIOD + NEW_LINE + FOUR_SPACE_INDENTATION + NEW_LINE_ASTERISK
+                + FOUR_SPACE_INDENTATION + JAVA_DOC_PARAM + BUILDER.toLowerCase() + OBJECT + SPACE + BUILDER_OBJECT
+                + className + NEW_LINE + FOUR_SPACE_INDENTATION + JAVA_DOC_END_LINE;
+    }
+
+    /**
+     * Generates javaDocs for build.
+     *
+     * @param buildName builder name
+     * @return javaDocs
+     */
+    private static String generateForBuild(String buildName) {
+        return NEW_LINE + FOUR_SPACE_INDENTATION + JAVA_DOC_FIRST_LINE + FOUR_SPACE_INDENTATION + JAVA_DOC_BUILD
+                + buildName + PERIOD + NEW_LINE + FOUR_SPACE_INDENTATION + NEW_LINE_ASTERISK + FOUR_SPACE_INDENTATION
+                + JAVA_DOC_RETURN + JAVA_DOC_BUILD_RETURN + buildName + PERIOD + NEW_LINE + FOUR_SPACE_INDENTATION
+                + JAVA_DOC_END_LINE;
+    }
+
+    /**
+     * Generates javaDocs for type constructor.
+     *
+     * @param attribute attribute string
+     * @return javaDocs for type constructor
+     */
+    private static String generateForTypeConstructor(String attribute) {
+        return NEW_LINE + FOUR_SPACE_INDENTATION + JAVA_DOC_FIRST_LINE + FOUR_SPACE_INDENTATION + JAVA_DOC_CONSTRUCTOR
+                + attribute + PERIOD + NEW_LINE + FOUR_SPACE_INDENTATION + NEW_LINE_ASTERISK + FOUR_SPACE_INDENTATION
+                + JAVA_DOC_PARAM + VALUE + SPACE + VALUE + SPACE + OF + SPACE + attribute + NEW_LINE
+                + FOUR_SPACE_INDENTATION + JAVA_DOC_END_LINE;
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/utils/io/impl/YangFileScanner.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/utils/io/impl/YangFileScanner.java
new file mode 100644
index 0000000..ff2e3e7
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/utils/io/impl/YangFileScanner.java
@@ -0,0 +1,107 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.utils.io.impl;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Stack;
+
+/**
+ * Represents utility for searching the files in a directory.
+ */
+public final class YangFileScanner {
+
+    private static final String JAVA_FILE_EXTENTION = ".java";
+    private static final String YANG_FILE_EXTENTION = ".yang";
+
+    /**
+     * Creates an instance of YANG file scanner.
+     */
+    private YangFileScanner() {
+    }
+
+    /**
+     * Returns the list of java files.
+     *
+     * @param root specified directory
+     * @return list of java files
+     * @throws NullPointerException when no files are there.
+     * @throws IOException          when files get deleted while performing the
+     *                              operations
+     */
+    public static List<String> getJavaFiles(String root) throws IOException {
+
+        return getFiles(root, JAVA_FILE_EXTENTION);
+    }
+
+    /**
+     * Returns the list of YANG file.
+     *
+     * @param root specified directory
+     * @return list of YANG file information
+     * @throws NullPointerException when no files are there
+     * @throws IOException          when files get deleted while performing the
+     *                              operations
+     */
+    public static List<String> getYangFiles(String root) throws IOException {
+
+        return getFiles(root, YANG_FILE_EXTENTION);
+    }
+
+    /**
+     * Returns the list of required files.
+     *
+     * @param root      specified directory
+     * @param extension file extension
+     * @return list of required files
+     * @throws NullPointerException when no file is there
+     * @throws IOException          when files get deleted while performing the operations
+     */
+    public static List<String> getFiles(String root, String extension) throws IOException {
+
+        List<String> store = new LinkedList<>();
+        Stack<String> stack = new Stack<>();
+        stack.push(root);
+        File file;
+        File[] filelist;
+        try {
+            while (!stack.empty()) {
+                root = stack.pop();
+                file = new File(root);
+                filelist = file.listFiles();
+                if ((filelist == null) || (filelist.length == 0)) {
+                    continue;
+                }
+                for (File current : filelist) {
+                    if (current.isDirectory()) {
+                        stack.push(current.toString());
+                    } else {
+                        String yangFile = current.getCanonicalPath();
+                        if (yangFile.endsWith(extension)) {
+                            store.add(yangFile);
+                        }
+                    }
+                }
+            }
+            return store;
+        } catch (IOException e) {
+            throw new IOException("No File found of " + extension + " extension in " + root + " directory.");
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/utils/io/impl/YangIoUtils.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/utils/io/impl/YangIoUtils.java
new file mode 100644
index 0000000..05cd471
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/utils/io/impl/YangIoUtils.java
@@ -0,0 +1,673 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.utils.io.impl;
+
+import java.io.BufferedReader;
+import java.io.BufferedWriter;
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.FileReader;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.io.InputStream;
+import java.io.ObjectInputStream;
+import java.io.ObjectOutputStream;
+import java.nio.file.Files;
+import java.nio.file.StandardCopyOption;
+import java.util.ArrayList;
+import java.util.Enumeration;
+import java.util.Iterator;
+import java.util.LinkedList;
+import java.util.List;
+import java.util.Set;
+import java.util.Stack;
+import java.util.jar.JarEntry;
+import java.util.jar.JarFile;
+import java.util.regex.Pattern;
+
+import org.apache.commons.io.FileUtils;
+import org.apache.maven.artifact.repository.ArtifactRepository;
+import org.apache.maven.model.Dependency;
+import org.apache.maven.model.Resource;
+import org.apache.maven.project.MavenProject;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.plugin.manager.YangFileInfo;
+import org.onosproject.yangutils.translator.tojava.utils.YangPluginConfig;
+import org.slf4j.Logger;
+import org.sonatype.plexus.build.incremental.BuildContext;
+
+import static org.onosproject.yangutils.translator.tojava.utils.JavaIdentifierSyntax.getCamelCase;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaIdentifierSyntax.getPackageDirPathFromJavaJPackage;
+import static org.onosproject.yangutils.utils.UtilConstants.COMMA;
+import static org.onosproject.yangutils.utils.UtilConstants.EMPTY_STRING;
+import static org.onosproject.yangutils.utils.UtilConstants.HASH;
+import static org.onosproject.yangutils.utils.UtilConstants.HYPHEN;
+import static org.onosproject.yangutils.utils.UtilConstants.JAR;
+import static org.onosproject.yangutils.utils.UtilConstants.NEW_LINE;
+import static org.onosproject.yangutils.utils.UtilConstants.OPEN_PARENTHESIS;
+import static org.onosproject.yangutils.utils.UtilConstants.ORG;
+import static org.onosproject.yangutils.utils.UtilConstants.PACKAGE;
+import static org.onosproject.yangutils.utils.UtilConstants.PERIOD;
+import static org.onosproject.yangutils.utils.UtilConstants.SEMI_COLAN;
+import static org.onosproject.yangutils.utils.UtilConstants.SLASH;
+import static org.onosproject.yangutils.utils.UtilConstants.SPACE;
+import static org.onosproject.yangutils.utils.UtilConstants.TEMP;
+import static org.onosproject.yangutils.utils.UtilConstants.TWELVE_SPACE_INDENTATION;
+import static org.onosproject.yangutils.utils.UtilConstants.YANG_RESOURCES;
+import static org.onosproject.yangutils.utils.io.impl.FileSystemUtil.appendFileContents;
+import static org.onosproject.yangutils.utils.io.impl.FileSystemUtil.updateFileHandle;
+import static org.onosproject.yangutils.utils.io.impl.JavaDocGen.getJavaDoc;
+import static org.onosproject.yangutils.utils.io.impl.JavaDocGen.JavaDocType.PACKAGE_INFO;
+import static org.slf4j.LoggerFactory.getLogger;
+
+/**
+ * Represents common utility functionalities for code generation.
+ */
+public final class YangIoUtils {
+
+    private static final Logger log = getLogger(YangIoUtils.class);
+    private static final String TARGET_RESOURCE_PATH = SLASH + TEMP + SLASH + YANG_RESOURCES + SLASH;
+    private static final int LINE_SIZE = 118;
+    private static final int SUB_LINE_SIZE = 112;
+    private static final int ZERO = 0;
+    private static final String SERIALIZED_FILE_EXTENSION = ".ser";
+
+    /**
+     * Creates an instance of YANG io utils.
+     */
+    private YangIoUtils() {
+    }
+
+    /**
+     * Creates the directory structure.
+     *
+     * @param path directory path
+     * @return directory structure
+     */
+    public static File createDirectories(String path) {
+        File generatedDir = new File(path);
+        generatedDir.mkdirs();
+        return generatedDir;
+    }
+
+    /**
+     * Adds package info file for the created directory.
+     *
+     * @param path         directory path
+     * @param classInfo    class info for the package
+     * @param pack         package of the directory
+     * @param isChildNode  is it a child node
+     * @param pluginConfig plugin configurations
+     * @throws IOException when fails to create package info file
+     */
+    public static void addPackageInfo(File path, String classInfo, String pack, boolean isChildNode,
+            YangPluginConfig pluginConfig)
+            throws IOException {
+
+        pack = parsePkg(pack);
+
+        try {
+
+            File packageInfo = new File(path + SLASH + "package-info.java");
+            packageInfo.createNewFile();
+
+            FileWriter fileWriter = new FileWriter(packageInfo);
+            BufferedWriter bufferedWriter = new BufferedWriter(fileWriter);
+
+            bufferedWriter.write(CopyrightHeader.getCopyrightHeader());
+            bufferedWriter.write(getJavaDoc(PACKAGE_INFO, classInfo, isChildNode, pluginConfig));
+            String pkg = PACKAGE + SPACE + pack + SEMI_COLAN;
+            if (pkg.length() > LINE_SIZE) {
+                pkg = whenDelimiterIsPersent(pkg, LINE_SIZE);
+            }
+            bufferedWriter.write(pkg);
+            bufferedWriter.close();
+            fileWriter.close();
+        } catch (IOException e) {
+            throw new IOException("Exception occured while creating package info file.");
+        }
+    }
+
+    /**
+     * Parses package and returns updated package.
+     *
+     * @param pack package needs to be updated
+     * @return updated package
+     */
+    public static String parsePkg(String pack) {
+
+        if (pack.contains(ORG)) {
+            String[] strArray = pack.split(ORG);
+            if (strArray.length >= 3) {
+                for (int i = 1; i < strArray.length; i++) {
+                    if (i == 1) {
+                        pack = ORG + strArray[1];
+                    } else {
+                        pack = pack + ORG + strArray[i];
+                    }
+                }
+            } else {
+                pack = ORG + strArray[1];
+            }
+        }
+
+        return pack;
+    }
+
+    /**
+     * Cleans the generated directory if already exist in source folder.
+     *
+     * @param dir generated directory in previous build
+     * @throws IOException when failed to delete directory
+     */
+    public static void deleteDirectory(String dir)
+            throws IOException {
+        File generatedDirectory = new File(dir);
+        if (generatedDirectory.exists()) {
+            try {
+                FileUtils.deleteDirectory(generatedDirectory);
+            } catch (IOException e) {
+                throw new IOException(
+                        "Failed to delete the generated files in " + generatedDirectory + " directory");
+            }
+        }
+    }
+
+    /**
+     * Searches and deletes generated temporary directories.
+     *
+     * @param root root directory
+     * @throws IOException when fails to do IO operations.
+     */
+    public static void searchAndDeleteTempDir(String root)
+            throws IOException {
+        List<File> store = new LinkedList<>();
+        Stack<String> stack = new Stack<>();
+        stack.push(root);
+
+        while (!stack.empty()) {
+            root = stack.pop();
+            File file = new File(root);
+            File[] filelist = file.listFiles();
+            if (filelist == null || filelist.length == 0) {
+                continue;
+            }
+            for (File current : filelist) {
+                if (current.isDirectory()) {
+                    stack.push(current.toString());
+                    if (current.getName().endsWith("-Temp")) {
+                        store.add(current);
+                    }
+                }
+            }
+        }
+
+        for (File dir : store) {
+            FileUtils.deleteDirectory(dir);
+        }
+    }
+
+    /**
+     * Adds generated source directory to the compilation root.
+     *
+     * @param source  directory
+     * @param project current maven project
+     * @param context current build context
+     */
+    public static void addToCompilationRoot(String source, MavenProject project, BuildContext context) {
+        project.addCompileSourceRoot(source);
+        context.refresh(project.getBasedir());
+        log.info("Source directory added to compilation root: " + source);
+    }
+
+    /**
+     * Removes extra char from the string.
+     *
+     * @param valueString    string to be trimmed
+     * @param removealStirng extra chars
+     * @return new string
+     */
+    public static String trimAtLast(String valueString, String removealStirng) {
+        StringBuilder stringBuilder = new StringBuilder(valueString);
+        int index = valueString.lastIndexOf(removealStirng);
+        stringBuilder.deleteCharAt(index);
+        return stringBuilder.toString();
+    }
+
+    /**
+     * Returns new parted string.
+     *
+     * @param partString string to be parted
+     * @return parted string
+     */
+    public static String partString(String partString) {
+        String[] strArray = partString.split(COMMA);
+        String newString = EMPTY_STRING;
+        for (int i = 0; i < strArray.length; i++) {
+            if (i % 4 != 0 || i == 0) {
+                newString = newString + strArray[i] + COMMA;
+            } else {
+                newString = newString + NEW_LINE + TWELVE_SPACE_INDENTATION
+                        + strArray[i] + COMMA;
+            }
+        }
+        return trimAtLast(newString, COMMA);
+    }
+
+    /**
+     * Returns the directory path of the package in canonical form.
+     *
+     * @param baseCodeGenPath base path where the generated files needs to be
+     *                        put
+     * @param pathOfJavaPkg   java package of the file being generated
+     * @return absolute path of the package in canonical form
+     */
+    public static String getDirectory(String baseCodeGenPath, String pathOfJavaPkg) {
+
+        if (pathOfJavaPkg.charAt(pathOfJavaPkg.length() - 1) == File.separatorChar) {
+            pathOfJavaPkg = trimAtLast(pathOfJavaPkg, SLASH);
+        }
+        String[] strArray = pathOfJavaPkg.split(SLASH);
+        if (strArray[0].equals(EMPTY_STRING)) {
+            return pathOfJavaPkg;
+        } else {
+            return baseCodeGenPath + SLASH + pathOfJavaPkg;
+        }
+    }
+
+    /**
+     * Returns the absolute path of the package in canonical form.
+     *
+     * @param baseCodeGenPath base path where the generated files needs to be
+     *                        put
+     * @param pathOfJavaPkg   java package of the file being generated
+     * @return absolute path of the package in canonical form
+     */
+    public static String getAbsolutePackagePath(String baseCodeGenPath, String pathOfJavaPkg) {
+        return baseCodeGenPath + pathOfJavaPkg;
+    }
+
+    /**
+     * Copies YANG files to the current project's output directory.
+     *
+     * @param yangFileInfo list of YANG files
+     * @param outputDir    project's output directory
+     * @param project      maven project
+     * @throws IOException when fails to copy files to destination resource directory
+     */
+    public static void copyYangFilesToTarget(Set<YangFileInfo> yangFileInfo, String outputDir, MavenProject project)
+            throws IOException {
+
+        List<File> files = getListOfFile(yangFileInfo);
+
+        String path = outputDir + TARGET_RESOURCE_PATH;
+        File targetDir = new File(path);
+        targetDir.mkdirs();
+
+        for (File file : files) {
+            Files.copy(file.toPath(),
+                    new File(path + file.getName()).toPath(),
+                    StandardCopyOption.REPLACE_EXISTING);
+        }
+        addToProjectResource(outputDir + SLASH + TEMP + SLASH, project);
+    }
+
+    /**
+     * Provides a list of files from list of strings.
+     *
+     * @param yangFileInfo set of yang file information
+     * @return list of files
+     */
+    private static List<File> getListOfFile(Set<YangFileInfo> yangFileInfo) {
+        List<File> files = new ArrayList<>();
+        Iterator<YangFileInfo> yangFileIterator = yangFileInfo.iterator();
+        while (yangFileIterator.hasNext()) {
+            YangFileInfo yangFile = yangFileIterator.next();
+            if (yangFile.isForTranslator()) {
+                files.add(new File(yangFile.getYangFileName()));
+            }
+        }
+        return files;
+    }
+
+    /**
+     * Merges the temp java files to main java files.
+     *
+     * @param appendFile temp file
+     * @param srcFile    main file
+     * @throws IOException when fails to append contents
+     */
+    public static void mergeJavaFiles(File appendFile, File srcFile)
+            throws IOException {
+        try {
+            appendFileContents(appendFile, srcFile);
+        } catch (IOException e) {
+            throw new IOException("Failed to append " + appendFile + " in " + srcFile);
+        }
+    }
+
+    /**
+     * Inserts data in the generated file.
+     *
+     * @param file file in which need to be inserted
+     * @param data data which need to be inserted
+     * @throws IOException when fails to insert into file
+     */
+    public static void insertDataIntoJavaFile(File file, String data)
+            throws IOException {
+        try {
+            updateFileHandle(file, data, false);
+        } catch (IOException e) {
+            throw new IOException("Failed to insert in " + file + "file");
+        }
+    }
+
+    /**
+     * Validates a line size in given file whether it is having more then 120 characters.
+     * If yes it will update and give a new file.
+     *
+     * @param dataFile file in which need to verify all lines.
+     * @return updated file
+     * @throws IOException when fails to do IO operations.
+     */
+    public static File validateLineLength(File dataFile)
+            throws IOException {
+        File tempFile = dataFile;
+        FileReader fileReader = new FileReader(dataFile);
+        BufferedReader bufferReader = new BufferedReader(fileReader);
+        try {
+            StringBuilder stringBuilder = new StringBuilder();
+            String line = bufferReader.readLine();
+
+            while (line != null) {
+                if (line.length() > LINE_SIZE) {
+                    if (line.contains(PERIOD)) {
+                        line = whenDelimiterIsPersent(line, LINE_SIZE);
+                    } else if (line.contains(SPACE)) {
+                        line = whenSpaceIsPresent(line, LINE_SIZE);
+                    }
+                    stringBuilder.append(line);
+                } else {
+                    stringBuilder.append(line + NEW_LINE);
+                }
+                line = bufferReader.readLine();
+            }
+            FileWriter writer = new FileWriter(tempFile);
+            writer.write(stringBuilder.toString());
+            writer.close();
+            return tempFile;
+        } finally {
+            fileReader.close();
+            bufferReader.close();
+        }
+    }
+
+    /* When delimiters are present in the given line. */
+    private static String whenDelimiterIsPersent(String line, int lineSize) {
+        StringBuilder stringBuilder = new StringBuilder();
+
+        if (line.length() > lineSize) {
+            String[] strArray = line.split(Pattern.quote(PERIOD));
+            stringBuilder = updateString(strArray, stringBuilder, PERIOD, lineSize);
+        } else {
+            stringBuilder.append(line + NEW_LINE);
+        }
+        String[] strArray = stringBuilder.toString().split(NEW_LINE);
+        StringBuilder tempBuilder = new StringBuilder();
+        for (String str : strArray) {
+            if (str.length() > SUB_LINE_SIZE) {
+                if (line.contains(PERIOD) && !line.contains(PERIOD + HASH + OPEN_PARENTHESIS)) {
+                    String[] strArr = str.split(Pattern.quote(PERIOD));
+                    tempBuilder = updateString(strArr, tempBuilder, PERIOD, SUB_LINE_SIZE);
+                } else if (str.contains(SPACE)) {
+                    tempBuilder.append(whenSpaceIsPresent(str, SUB_LINE_SIZE));
+                }
+            } else {
+                tempBuilder.append(str + NEW_LINE);
+            }
+        }
+        return tempBuilder.toString();
+
+    }
+
+    /* When spaces are present in the given line. */
+    private static String whenSpaceIsPresent(String line, int lineSize) {
+        StringBuilder stringBuilder = new StringBuilder();
+        if (line.length() > lineSize) {
+            String[] strArray = line.split(SPACE);
+            stringBuilder = updateString(strArray, stringBuilder, SPACE, lineSize);
+        } else {
+            stringBuilder.append(line + NEW_LINE);
+        }
+
+        String[] strArray = stringBuilder.toString().split(NEW_LINE);
+        StringBuilder tempBuilder = new StringBuilder();
+        for (String str : strArray) {
+            if (str.length() > SUB_LINE_SIZE) {
+                if (str.contains(SPACE)) {
+                    String[] strArr = str.split(SPACE);
+                    tempBuilder = updateString(strArr, tempBuilder, SPACE, SUB_LINE_SIZE);
+                }
+            } else {
+                tempBuilder.append(str + NEW_LINE);
+            }
+        }
+        return tempBuilder.toString();
+    }
+
+    /* Updates the given line with the given size conditions. */
+    private static StringBuilder updateString(String[] strArray, StringBuilder stringBuilder, String string,
+            int lineSize) {
+
+        StringBuilder tempBuilder = new StringBuilder();
+        for (String str : strArray) {
+            tempBuilder.append(str + string);
+            if (tempBuilder.length() > lineSize) {
+                String tempString = stringBuilder.toString();
+                stringBuilder.delete(ZERO, stringBuilder.length());
+                tempString = trimAtLast(tempString, string);
+                stringBuilder.append(tempString);
+                if (string.equals(PERIOD)) {
+                    stringBuilder.append(NEW_LINE + TWELVE_SPACE_INDENTATION + PERIOD + str + string);
+                } else {
+                    stringBuilder.append(NEW_LINE + TWELVE_SPACE_INDENTATION + str + string);
+                }
+                tempBuilder.delete(ZERO, tempBuilder.length());
+                tempBuilder.append(TWELVE_SPACE_INDENTATION);
+            } else {
+                stringBuilder.append(str + string);
+            }
+        }
+        String tempString = stringBuilder.toString();
+        tempString = trimAtLast(tempString, string);
+        stringBuilder.delete(ZERO, stringBuilder.length());
+        stringBuilder.append(tempString + NEW_LINE);
+        return stringBuilder;
+    }
+
+    /**
+     * Serializes data-model.
+     *
+     * @param directory base directory for serialized files
+     * @param fileInfoSet YANG file info set
+     * @param project maven project
+     * @param operation true if need to add to resource
+     * @throws IOException when fails to do IO operations
+     */
+    public static void serializeDataModel(String directory, Set<YangFileInfo> fileInfoSet,
+            MavenProject project, boolean operation) throws IOException {
+
+        String serFileDirPath = directory + TARGET_RESOURCE_PATH;
+        File dir = new File(serFileDirPath);
+        dir.mkdirs();
+
+        if (operation) {
+            addToProjectResource(directory + SLASH + TEMP + SLASH, project);
+        }
+
+        for (YangFileInfo fileInfo : fileInfoSet) {
+
+            String serFileName = serFileDirPath + getCamelCase(fileInfo.getRootNode().getName(), null)
+                    + SERIALIZED_FILE_EXTENSION;
+            fileInfo.setSerializedFile(serFileName);
+            FileOutputStream fileOutputStream = new FileOutputStream(serFileName);
+            ObjectOutputStream objectOutputStream = new ObjectOutputStream(fileOutputStream);
+            objectOutputStream.writeObject(fileInfo.getRootNode());
+            objectOutputStream.close();
+            fileOutputStream.close();
+        }
+    }
+
+    /* Adds directory to resources of project */
+    private static void addToProjectResource(String dir, MavenProject project) {
+        Resource rsc = new Resource();
+        rsc.setDirectory(dir);
+        project.addResource(rsc);
+    }
+
+    /**
+     * Returns de-serializes YANG data-model nodes.
+     *
+     * @param serailizedfileInfoSet YANG file info set
+     * @return de-serializes YANG data-model nodes
+     * @throws IOException when fails do IO operations
+     */
+    public static List<YangNode> deSerializeDataModel(List<String> serailizedfileInfoSet) throws IOException {
+
+        List<YangNode> nodes = new ArrayList<>();
+        for (String fileInfo : serailizedfileInfoSet) {
+            YangNode node = null;
+            try {
+                FileInputStream fileInputStream = new FileInputStream(fileInfo);
+                ObjectInputStream objectInputStream = new ObjectInputStream(fileInputStream);
+                node = (YangNode) objectInputStream.readObject();
+                nodes.add(node);
+                objectInputStream.close();
+                fileInputStream.close();
+            } catch (IOException | ClassNotFoundException e) {
+                throw new IOException(fileInfo + " not found.");
+            }
+        }
+        return nodes;
+    }
+
+    /**
+     * Resolves inter jar dependencies.
+     *
+     * @param project current maven project
+     * @param localRepository local maven repository
+     * @param remoteRepos list of remote repository
+     * @param directory directory for serialized files
+     * @return list of resolved datamodel nodes
+     * @throws IOException when fails to do IO operations
+     */
+    public static List<YangNode> resolveInterJarDependencies(MavenProject project, ArtifactRepository localRepository,
+            List<ArtifactRepository> remoteRepos, String directory) throws IOException {
+
+        List<String> dependeciesJarPaths = resolveDependecyJarPath(project, localRepository, remoteRepos);
+        List<YangNode> resolvedDataModelNodes = new ArrayList<>();
+        for (String dependecy : dependeciesJarPaths) {
+            resolvedDataModelNodes.addAll(deSerializeDataModel(parseJarFile(dependecy, directory)));
+        }
+        return resolvedDataModelNodes;
+    }
+
+    /**
+     * Returns list of jar path.
+     *
+     * @return list of jar paths
+     */
+    private static List<String> resolveDependecyJarPath(MavenProject project, ArtifactRepository localRepository,
+            List<ArtifactRepository> remoteRepos) {
+
+        StringBuilder path = new StringBuilder();
+        List<String> jarPaths = new ArrayList<>();
+        for (Dependency dependency : project.getDependencies()) {
+
+            path.append(localRepository.getBasedir());
+            path.append(SLASH);
+            path.append(getPackageDirPathFromJavaJPackage(dependency.getGroupId()));
+            path.append(SLASH);
+            path.append(dependency.getArtifactId());
+            path.append(SLASH);
+            path.append(dependency.getVersion());
+            path.append(SLASH);
+            path.append(dependency.getArtifactId() + HYPHEN + dependency.getVersion() + PERIOD + JAR);
+            File jarFile = new File(path.toString());
+            if (jarFile.exists()) {
+                jarPaths.add(path.toString());
+            }
+            path.delete(0, path.length());
+        }
+
+        for (ArtifactRepository repo : remoteRepos) {
+            // TODO: add resolver for remote repo.
+        }
+        return jarPaths;
+    }
+
+    /**
+     * Parses jar file and returns list of serialized file names.
+     *
+     * @param jarFile jar file to be parsed
+     * @param directory directory for keeping the searized files
+     * @return list of serialized files
+     * @throws IOException when fails to do IO operations
+     */
+    public static List<String> parseJarFile(String jarFile, String directory)
+            throws IOException {
+
+        List<String> serailizedFiles = new ArrayList<>();
+        JarFile jar = new JarFile(jarFile);
+        Enumeration<?> enumEntries = jar.entries();
+
+        File serializedFileDir = new File(directory);
+        serializedFileDir.mkdirs();
+        while (enumEntries.hasMoreElements()) {
+            JarEntry file = (JarEntry) enumEntries.nextElement();
+            if (file.getName().endsWith(SERIALIZED_FILE_EXTENSION)) {
+                if (file.getName().contains(SLASH)) {
+                    String[] strArray = file.getName().split(SLASH);
+                    String tempPath = "";
+                    for (int i = 0; i < strArray.length - 1; i++) {
+                        tempPath = SLASH + tempPath + SLASH + strArray[i];
+                    }
+                    File dir = new File(directory + tempPath);
+                    dir.mkdirs();
+                }
+                File serailizedFile = new File(directory + SLASH + file.getName());
+                if (file.isDirectory()) {
+                    serailizedFile.mkdirs();
+                    continue;
+                }
+                InputStream inputStream = jar.getInputStream(file);
+
+                FileOutputStream fileOutputStream = new FileOutputStream(serailizedFile);
+                while (inputStream.available() > 0) {
+                    fileOutputStream.write(inputStream.read());
+                }
+                fileOutputStream.close();
+                inputStream.close();
+                serailizedFiles.add(serailizedFile.toString());
+            }
+        }
+        jar.close();
+        return serailizedFiles;
+    }
+
+}
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/utils/io/impl/package-info.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/utils/io/impl/package-info.java
new file mode 100644
index 0000000..a128fa2
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/utils/io/impl/package-info.java
@@ -0,0 +1,20 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * File system utilities implementation.
+ */
+package org.onosproject.yangutils.utils.io.impl;
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/utils/io/package-info.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/utils/io/package-info.java
new file mode 100644
index 0000000..856653e
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/utils/io/package-info.java
@@ -0,0 +1,20 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * File system utilities.
+ */
+package org.onosproject.yangutils.utils.io;
diff --git a/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/utils/package-info.java b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/utils/package-info.java
new file mode 100644
index 0000000..2123da0
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/java/org/onosproject/yangutils/utils/package-info.java
@@ -0,0 +1,20 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * Utilities for YANG maven plugin.
+ */
+package org.onosproject.yangutils.utils;
diff --git a/utils/yangutils/plugin/src/main/resources/CopyrightHeader.txt b/utils/yangutils/plugin/src/main/resources/CopyrightHeader.txt
new file mode 100644
index 0000000..2cbed45
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/resources/CopyrightHeader.txt
@@ -0,0 +1,14 @@
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
diff --git a/utils/yangutils/plugin/src/main/resources/GeneratedYang.g4 b/utils/yangutils/plugin/src/main/resources/GeneratedYang.g4
new file mode 100644
index 0000000..55a7a35
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/resources/GeneratedYang.g4
@@ -0,0 +1,1299 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * This is a YANG grammar for parser based on which ANTLR will generate YANG parser.
+ */
+
+grammar GeneratedYang;
+import YangLexer;
+
+@header {
+package org.onosproject.yangutils.parser.antlrgencode;
+}
+
+    yangfile : moduleStatement EOF
+             | subModuleStatement EOF;
+
+    /**
+     * module-stmt         = optsep module-keyword sep identifier-arg-str
+     *                       optsep
+     *                       "{" stmtsep
+     *                           module-header-stmts
+     *                           linkage-stmts
+     *                           meta-stmts
+     *                           revision-stmts
+     *                           body-stmts
+     *                       "}" optsep
+     */
+
+    moduleStatement : MODULE_KEYWORD identifier LEFT_CURLY_BRACE moduleBody RIGHT_CURLY_BRACE;
+
+    moduleBody : moduleHeaderStatement linkageStatements metaStatements revisionStatements bodyStatements;
+
+    /**
+     * module-header-stmts = ;; these stmts can appear in any order
+     *                       [yang-version-stmt stmtsep]
+     *                        namespace-stmt stmtsep
+     *                        prefix-stmt stmtsep
+     */
+
+    moduleHeaderStatement : yangVersionStatement? namespaceStatement prefixStatement
+                            | yangVersionStatement? prefixStatement namespaceStatement
+                            | namespaceStatement yangVersionStatement? prefixStatement
+                            | namespaceStatement prefixStatement yangVersionStatement?
+                            | prefixStatement namespaceStatement yangVersionStatement?
+                            | prefixStatement yangVersionStatement? namespaceStatement
+                            ;
+
+    /**
+     * linkage-stmts       = ;; these stmts can appear in any order
+     *                       *(import-stmt stmtsep)
+     *                       *(include-stmt stmtsep)
+     */
+    linkageStatements : (importStatement
+                  | includeStatement)*;
+
+    /**
+     * meta-stmts          = ;; these stmts can appear in any order
+     *                       [organization-stmt stmtsep]
+     *                       [contact-stmt stmtsep]
+     *                       [description-stmt stmtsep]
+     *                       [reference-stmt stmtsep]
+     */
+    metaStatements : organizationStatement? contactStatement? descriptionStatement? referenceStatement?
+               | organizationStatement? contactStatement? referenceStatement? descriptionStatement?
+               | organizationStatement? descriptionStatement? contactStatement? referenceStatement?
+               | organizationStatement? descriptionStatement? referenceStatement? contactStatement?
+               | organizationStatement? referenceStatement? contactStatement? descriptionStatement?
+               | organizationStatement? referenceStatement? descriptionStatement? contactStatement?
+               | contactStatement? organizationStatement? descriptionStatement? referenceStatement?
+               | contactStatement? organizationStatement? referenceStatement? descriptionStatement?
+               | contactStatement? referenceStatement? organizationStatement? descriptionStatement?
+               | contactStatement? referenceStatement? descriptionStatement? organizationStatement?
+               | contactStatement? descriptionStatement? referenceStatement? organizationStatement?
+               | contactStatement? descriptionStatement? organizationStatement? referenceStatement?
+               | referenceStatement? contactStatement? organizationStatement? descriptionStatement?
+               | referenceStatement? contactStatement? descriptionStatement? organizationStatement?
+               | referenceStatement? organizationStatement? contactStatement? descriptionStatement?
+               | referenceStatement? organizationStatement? descriptionStatement? contactStatement?
+               | referenceStatement? descriptionStatement? organizationStatement? contactStatement?
+               | referenceStatement? descriptionStatement? contactStatement? organizationStatement?
+               | descriptionStatement? referenceStatement? contactStatement? organizationStatement?
+               | descriptionStatement? referenceStatement? organizationStatement? contactStatement?
+               | descriptionStatement? contactStatement? referenceStatement? organizationStatement?
+               | descriptionStatement? contactStatement? organizationStatement? referenceStatement?
+               | descriptionStatement? organizationStatement? contactStatement? referenceStatement?
+               | descriptionStatement? organizationStatement? referenceStatement? contactStatement?
+               ;
+
+    // revision-stmts      = *(revision-stmt stmtsep)
+    revisionStatements : revisionStatement*;
+
+    /**
+     * body-stmts          = *((extension-stmt /
+     *                          feature-stmt /
+     *                          identity-stmt /
+     *                          typedef-stmt /
+     *                          grouping-stmt /
+     *                          data-def-stmt /
+     *                          augment-stmt /
+     *                          rpc-stmt /
+     *                          notification-stmt /
+     *                          deviation-stmt) stmtsep)
+     */
+    bodyStatements : (extensionStatement
+               | featureStatement
+               | identityStatement
+               | typedefStatement
+               | groupingStatement
+               | dataDefStatement
+               | augmentStatement
+               | rpcStatement
+               | notificationStatement
+               | deviationStatement)*
+               ;
+
+    /**
+     * yang-version-stmt   = yang-version-keyword sep yang-version-arg-str
+     *                       optsep stmtend
+     */
+    yangVersionStatement :   YANG_VERSION_KEYWORD version STMTEND;
+
+
+    /**
+     * namespace-stmt      = namespace-keyword sep uri-str optsep stmtend
+     * For namespace validation TODO in Listener
+     */
+    namespaceStatement : NAMESPACE_KEYWORD string STMTEND;
+
+    /**
+     * prefix-stmt         = prefix-keyword sep prefix-arg-str
+     *                       optsep stmtend
+     */
+    prefixStatement : PREFIX_KEYWORD identifier STMTEND;
+
+    /**
+     * import-stmt         = import-keyword sep identifier-arg-str optsep
+     *                       "{" stmtsep
+     *                           prefix-stmt stmtsep
+     *                           [revision-date-stmt stmtsep]
+     *                        "}"
+     */
+    importStatement : IMPORT_KEYWORD identifier LEFT_CURLY_BRACE importStatementBody RIGHT_CURLY_BRACE;
+
+    importStatementBody : prefixStatement revisionDateStatement?;
+
+    // revision-date-stmt = revision-date-keyword sep revision-date stmtend
+    revisionDateStatement : REVISION_DATE_KEYWORD dateArgumentString STMTEND;
+
+    /**
+     * include-stmt        = include-keyword sep identifier-arg-str optsep
+     *                             (";" /
+     *                              "{" stmtsep
+     *                                  [revision-date-stmt stmtsep]
+     *                            "}")
+     */
+    includeStatement : INCLUDE_KEYWORD identifier (STMTEND | LEFT_CURLY_BRACE revisionDateStatement? RIGHT_CURLY_BRACE);
+
+    /**
+     * organization-stmt   = organization-keyword sep string
+     *                            optsep stmtend
+     */
+    organizationStatement : ORGANIZATION_KEYWORD string STMTEND;
+
+    // contact-stmt        = contact-keyword sep string optsep stmtend
+    contactStatement : CONTACT_KEYWORD string STMTEND;
+
+    // description-stmt    = description-keyword sep string optsep stmtend
+    descriptionStatement : DESCRIPTION_KEYWORD string STMTEND;
+
+    // reference-stmt      = reference-keyword sep string optsep stmtend
+    referenceStatement : REFERENCE_KEYWORD string STMTEND;
+
+    /**
+     * revision-stmt       = revision-keyword sep revision-date optsep
+     *                             (";" /
+     *                              "{" stmtsep
+     *                                  [description-stmt stmtsep]
+     *                                  [reference-stmt stmtsep]
+     *                              "}")
+     */
+    revisionStatement : REVISION_KEYWORD dateArgumentString (STMTEND | LEFT_CURLY_BRACE revisionStatementBody RIGHT_CURLY_BRACE);
+    revisionStatementBody : descriptionStatement? referenceStatement?;
+
+    /**
+     * submodule-stmt      = optsep submodule-keyword sep identifier-arg-str
+     *                             optsep
+     *                             "{" stmtsep
+     *                                 submodule-header-stmts
+     *                                 linkage-stmts
+     *                                 meta-stmts
+     *                                 revision-stmts
+     *                                 body-stmts
+     *                             "}" optsep
+     */
+    subModuleStatement : SUBMODULE_KEYWORD identifier LEFT_CURLY_BRACE submoduleBody RIGHT_CURLY_BRACE;
+    submoduleBody : submoduleHeaderStatement linkageStatements metaStatements revisionStatements bodyStatements;
+
+    /** submodule-header-stmts =
+     *                            ;; these stmts can appear in any order
+     *                            [yang-version-stmt stmtsep]
+     *                             belongs-to-stmt stmtsep
+     */
+    submoduleHeaderStatement : yangVersionStatement? belongstoStatement
+                               | belongstoStatement yangVersionStatement?
+                              ;
+
+    /**
+     * belongs-to-stmt     = belongs-to-keyword sep identifier-arg-str
+     *                       optsep
+     *                       "{" stmtsep
+     *                           prefix-stmt stmtsep
+     *                       "}"
+     */
+    belongstoStatement : BELONGS_TO_KEYWORD identifier LEFT_CURLY_BRACE belongstoStatementBody RIGHT_CURLY_BRACE;
+    belongstoStatementBody : prefixStatement;
+
+    /**
+     * extension-stmt      = extension-keyword sep identifier-arg-str optsep
+     *                       (";" /
+     *                        "{" stmtsep
+     *                            ;; these stmts can appear in any order
+     *                            [argument-stmt stmtsep]
+     *                            [status-stmt stmtsep]
+     *                            [description-stmt stmtsep]
+     *                            [reference-stmt stmtsep]
+     *                        "}")
+     */
+    extensionStatement : EXTENSION_KEYWORD identifier (STMTEND | LEFT_CURLY_BRACE extensionBody RIGHT_CURLY_BRACE);
+    extensionBody : argumentStatement? statusStatement? descriptionStatement? referenceStatement?
+                   | argumentStatement? statusStatement? referenceStatement? descriptionStatement?
+                   | argumentStatement? descriptionStatement? statusStatement? referenceStatement?
+                   | argumentStatement? descriptionStatement? referenceStatement? statusStatement?
+                   | argumentStatement? referenceStatement? descriptionStatement? statusStatement?
+                   | argumentStatement? referenceStatement? statusStatement? descriptionStatement?
+                   | statusStatement? referenceStatement? argumentStatement? descriptionStatement?
+                   | statusStatement? referenceStatement? descriptionStatement? argumentStatement?
+                   | statusStatement? descriptionStatement? referenceStatement? argumentStatement?
+                   | statusStatement? descriptionStatement? argumentStatement? referenceStatement?
+                   | statusStatement? argumentStatement? referenceStatement? descriptionStatement?
+                   | statusStatement? argumentStatement? descriptionStatement? referenceStatement?
+                   | descriptionStatement? argumentStatement? statusStatement? referenceStatement?
+                   | descriptionStatement? argumentStatement? referenceStatement? statusStatement?
+                   | descriptionStatement? statusStatement? argumentStatement? referenceStatement?
+                   | descriptionStatement? statusStatement? referenceStatement? argumentStatement?
+                   | descriptionStatement? referenceStatement? statusStatement? argumentStatement?
+                   | descriptionStatement? referenceStatement? argumentStatement? statusStatement?
+                   | referenceStatement? descriptionStatement? argumentStatement? statusStatement?
+                   | referenceStatement? descriptionStatement? statusStatement? argumentStatement?
+                   | referenceStatement? statusStatement? argumentStatement? descriptionStatement?
+                   | referenceStatement? statusStatement? descriptionStatement? argumentStatement?
+                   | referenceStatement? argumentStatement? descriptionStatement? statusStatement?
+                   | referenceStatement? argumentStatement? statusStatement? descriptionStatement?
+                   ;
+
+    /**
+     * argument-stmt       = argument-keyword sep identifier-arg-str optsep
+     *                       (";" /
+     *                        "{" stmtsep
+     *                            [yin-element-stmt stmtsep]
+     *                        "}")
+     */
+    argumentStatement : ARGUMENT_KEYWORD identifier (STMTEND | LEFT_CURLY_BRACE argumentBody RIGHT_CURLY_BRACE);
+    argumentBody : yinElementStatement?;
+
+    /**
+     * yin-element-stmt    = yin-element-keyword sep yin-element-arg-str
+     *                       stmtend
+     */
+    yinElementStatement : YIN_ELEMENT_KEYWORD (TRUE_KEYWORD | FALSE_KEYWORD) STMTEND;
+
+    /**
+     * identity-stmt       = identity-keyword sep identifier-arg-str optsep
+     *                       (";" /
+     *                        "{" stmtsep
+     *                            ;; these stmts can appear in any order
+     *                            [base-stmt stmtsep]
+     *                            [status-stmt stmtsep]
+     *                            [description-stmt stmtsep]
+     *                            [reference-stmt stmtsep]
+     *                        "}")
+     */
+    identityStatement : IDENTITY_KEYWORD identifier (STMTEND | LEFT_CURLY_BRACE identityBody RIGHT_CURLY_BRACE);
+    identityBody : baseStatement? statusStatement? descriptionStatement? referenceStatement?
+                  | baseStatement? statusStatement? referenceStatement? descriptionStatement?
+                  | baseStatement? descriptionStatement? statusStatement? referenceStatement?
+                  | baseStatement? descriptionStatement? referenceStatement? statusStatement?
+                  | baseStatement? referenceStatement? descriptionStatement? statusStatement?
+                  | baseStatement? referenceStatement? statusStatement? descriptionStatement?
+                  | referenceStatement? baseStatement? statusStatement? descriptionStatement?
+                  | referenceStatement? baseStatement? descriptionStatement? statusStatement?
+                  | referenceStatement? statusStatement? baseStatement? descriptionStatement?
+                  | referenceStatement? statusStatement? descriptionStatement? baseStatement?
+                  | referenceStatement? descriptionStatement? statusStatement? baseStatement?
+                  | referenceStatement? descriptionStatement? baseStatement? statusStatement?
+                  | descriptionStatement? referenceStatement? statusStatement? baseStatement?
+                  | descriptionStatement? referenceStatement? statusStatement? baseStatement?
+                  | descriptionStatement? referenceStatement? baseStatement? statusStatement?
+                  | descriptionStatement? statusStatement? baseStatement? referenceStatement?
+                  | descriptionStatement? statusStatement? referenceStatement? baseStatement?
+                  | descriptionStatement? baseStatement? referenceStatement? statusStatement?
+                  | descriptionStatement? baseStatement? statusStatement? referenceStatement?
+                  | statusStatement? baseStatement? descriptionStatement? referenceStatement?
+                  | statusStatement? baseStatement? referenceStatement? descriptionStatement?
+                  | statusStatement? descriptionStatement? baseStatement? referenceStatement?
+                  | statusStatement? descriptionStatement? referenceStatement? baseStatement?
+                  | statusStatement? referenceStatement? descriptionStatement? baseStatement?
+                  | statusStatement? referenceStatement? baseStatement? descriptionStatement?
+                  ;
+
+    /**
+     * base-stmt           = base-keyword sep identifier-ref-arg-str
+     *                          optsep stmtend*
+     * identifier-ref-arg  = [prefix ":"] identifier
+     */
+    baseStatement : BASE_KEYWORD string STMTEND;
+
+    /**
+     *  feature-stmt        = feature-keyword sep identifier-arg-str optsep
+     *                        (";" /
+     *                         "{" stmtsep
+     *                             ;; these stmts can appear in any order
+     *                             *(if-feature-stmt stmtsep)
+     *                             [status-stmt stmtsep]
+     *                             [description-stmt stmtsep]
+     *                             [reference-stmt stmtsep]
+     *                         "}")
+     */
+    featureStatement : FEATURE_KEYWORD string (STMTEND | LEFT_CURLY_BRACE featureBody RIGHT_CURLY_BRACE);
+    featureBody : ifFeatureStatement* statusStatement? descriptionStatement? referenceStatement?
+                 | ifFeatureStatement* statusStatement? referenceStatement? descriptionStatement?
+                 | ifFeatureStatement* descriptionStatement? statusStatement? referenceStatement?
+                 | ifFeatureStatement* descriptionStatement? referenceStatement? statusStatement?
+                 | ifFeatureStatement* referenceStatement? statusStatement? descriptionStatement?
+                 | ifFeatureStatement* referenceStatement? descriptionStatement? statusStatement?
+                 | statusStatement? ifFeatureStatement* descriptionStatement? referenceStatement?
+                 | statusStatement? ifFeatureStatement* referenceStatement? descriptionStatement?
+                 | statusStatement? descriptionStatement? ifFeatureStatement* referenceStatement?
+                 | statusStatement? descriptionStatement? referenceStatement? ifFeatureStatement*
+                 | statusStatement? referenceStatement? ifFeatureStatement* descriptionStatement?
+                 | statusStatement? referenceStatement? descriptionStatement? ifFeatureStatement*
+                 | descriptionStatement? ifFeatureStatement* statusStatement? referenceStatement?
+                 | descriptionStatement? ifFeatureStatement* referenceStatement? statusStatement?
+                 | descriptionStatement? statusStatement? ifFeatureStatement* referenceStatement?
+                 | descriptionStatement? statusStatement? referenceStatement? ifFeatureStatement*
+                 | descriptionStatement? referenceStatement* statusStatement? ifFeatureStatement*
+                 | descriptionStatement? referenceStatement* ifFeatureStatement? statusStatement?
+                 | referenceStatement? ifFeatureStatement* statusStatement? descriptionStatement?
+                 | referenceStatement? ifFeatureStatement* descriptionStatement? statusStatement?
+                 | referenceStatement? descriptionStatement? statusStatement? ifFeatureStatement*
+                 | referenceStatement? descriptionStatement? ifFeatureStatement* statusStatement?
+                 | referenceStatement? statusStatement? descriptionStatement? ifFeatureStatement*
+                 | referenceStatement? statusStatement? ifFeatureStatement* descriptionStatement?
+                 ;
+
+    /**
+     *  data-def-stmt       = container-stmt /
+     *                       leaf-stmt /
+     *                       leaf-list-stmt /
+     *                       list-stmt /
+     *                       choice-stmt /
+     *                       anyxml-stmt /
+     *                       uses-stmt
+     */
+    dataDefStatement : containerStatement
+                    | leafStatement
+                    | leafListStatement
+                    | listStatement
+                    | choiceStatement
+                    | anyxmlStatement
+                    | usesStatement;
+
+    /**
+     *  if-feature-stmt     = if-feature-keyword sep identifier-ref-arg-str
+     *                        optsep stmtend
+     */
+    ifFeatureStatement : IF_FEATURE_KEYWORD string STMTEND;
+
+    /**
+    *    units-stmt          = units-keyword sep string optsep stmtend
+    */
+    unitsStatement : UNITS_KEYWORD string STMTEND;
+
+    /**
+     *   typedef-stmt        = typedef-keyword sep identifier-arg-str optsep
+     *                         "{" stmtsep
+     *                             ;; these stmts can appear in any order
+     *                             type-stmt stmtsep
+     *                            [units-stmt stmtsep]
+     *                             [default-stmt stmtsep]
+     *                             [status-stmt stmtsep]
+     *                             [description-stmt stmtsep]
+     *                             [reference-stmt stmtsep]
+     *                           "}"
+     * TODO : 0..1 occurance to be validated in listener
+     */
+    typedefStatement : TYPEDEF_KEYWORD identifier LEFT_CURLY_BRACE
+                   (typeStatement | unitsStatement | defaultStatement | statusStatement | descriptionStatement | referenceStatement)*
+                   RIGHT_CURLY_BRACE;
+
+    /**
+     *  type-stmt           = type-keyword sep identifier-ref-arg-str optsep
+     *                        (";" /
+     *                         "{" stmtsep
+     *                            type-body-stmts
+     *                         "}")
+     */
+    typeStatement : TYPE_KEYWORD string (STMTEND | LEFT_CURLY_BRACE typeBodyStatements RIGHT_CURLY_BRACE);
+
+    /**
+     *  type-body-stmts     = numerical-restrictions /
+     *                        decimal64-specification /
+     *                       string-restrictions /
+     *                        enum-specification /
+     *                        leafref-specification /
+     *                        identityref-specification /
+     *                        instance-identifier-specification /
+     *                        bits-specification /
+     *                        union-specification
+     *
+     */
+    typeBodyStatements : numericalRestrictions | decimal64Specification | stringRestrictions | enumSpecification
+                    | leafrefSpecification | identityrefSpecification | instanceIdentifierSpecification
+                    | bitsSpecification | unionSpecification;
+
+    /**
+     *  fraction-digits-stmt = fraction-digits-keyword sep
+     *                         fraction-digits-arg-str stmtend
+     *
+     *  fraction-digits-arg-str = < a string that matches the rule
+     *                             fraction-digits-arg >
+     *
+     *  fraction-digits-arg = ("1" ["0" / "1" / "2" / "3" / "4" /
+     *                              "5" / "6" / "7" / "8"])
+     *                        / "2" / "3" / "4" / "5" / "6" / "7" / "8" / "9"
+     */
+    decimal64Specification : FRACTION_DIGITS_KEYWORD fraction STMTEND;
+
+    /**
+     *  numerical-restrictions = range-stmt stmtsep
+     */
+    numericalRestrictions : rangeStatement;
+
+    /**
+     *  range-stmt          = range-keyword sep range-arg-str optsep
+     *                        (";" /
+     *                         "{" stmtsep
+     *                             ;; these stmts can appear in any order
+     *                             [error-message-stmt stmtsep]
+     *                             [error-app-tag-stmt stmtsep]
+     *                             [description-stmt stmtsep]
+     *                             [reference-stmt stmtsep]
+     *                          "}")
+     */
+    rangeStatement : RANGE_KEYWORD range (STMTEND | LEFT_CURLY_BRACE commonStatements RIGHT_CURLY_BRACE);
+
+    commonStatements : errorMessageStatement? errorAppTagStatement? descriptionStatement? referenceStatement?
+                 | errorMessageStatement? errorAppTagStatement? referenceStatement? descriptionStatement?
+                 | errorMessageStatement? descriptionStatement? errorAppTagStatement? referenceStatement?
+                 | errorMessageStatement? descriptionStatement? referenceStatement? errorAppTagStatement?
+                 | errorMessageStatement? referenceStatement? errorAppTagStatement? descriptionStatement?
+                 | errorMessageStatement? referenceStatement? descriptionStatement? errorAppTagStatement?
+                 | errorAppTagStatement? errorMessageStatement? descriptionStatement? referenceStatement?
+                 | errorAppTagStatement? errorMessageStatement? referenceStatement? descriptionStatement?
+                 | errorAppTagStatement? descriptionStatement? descriptionStatement? errorMessageStatement?
+                 | errorAppTagStatement? descriptionStatement? errorMessageStatement? descriptionStatement?
+                 | errorAppTagStatement? referenceStatement? errorMessageStatement? descriptionStatement?
+                 | errorAppTagStatement? referenceStatement? descriptionStatement? errorMessageStatement?
+                 | descriptionStatement? errorMessageStatement? errorAppTagStatement? referenceStatement?
+                 | descriptionStatement? errorMessageStatement? referenceStatement? errorAppTagStatement?
+                 | descriptionStatement? errorAppTagStatement? errorMessageStatement? referenceStatement?
+                 | descriptionStatement? errorAppTagStatement? referenceStatement? errorMessageStatement?
+                 | descriptionStatement? referenceStatement? errorMessageStatement? errorAppTagStatement?
+                 | descriptionStatement? referenceStatement? errorAppTagStatement? errorMessageStatement?
+                 | referenceStatement? errorMessageStatement? descriptionStatement? errorAppTagStatement?
+                 | referenceStatement? errorMessageStatement? errorAppTagStatement? descriptionStatement?
+                 | referenceStatement? errorAppTagStatement? descriptionStatement? errorMessageStatement?
+                 | referenceStatement? errorAppTagStatement? errorMessageStatement? descriptionStatement?
+                 | referenceStatement? descriptionStatement? errorMessageStatement? errorAppTagStatement?
+                 | referenceStatement? descriptionStatement? errorAppTagStatement? errorMessageStatement?
+                 ;
+
+    /**
+     *  string-restrictions = ;; these stmts can appear in any order
+     *                        [length-stmt stmtsep]
+     *                        *(pattern-stmt stmtsep)
+     */
+    stringRestrictions : ((lengthStatement)? (patternStatement)*) | ((patternStatement)* (lengthStatement)?);
+
+    /**
+     *  length-stmt         = length-keyword sep length-arg-str optsep
+     *                        (";" /
+     *                         "{" stmtsep
+     *                             ;; these stmts can appear in any order
+     *                             [error-message-stmt stmtsep]
+     *                             [error-app-tag-stmt stmtsep]
+     *                             [description-stmt stmtsep]
+     *                             [reference-stmt stmtsep]
+     *                          "}")
+     */
+    lengthStatement : LENGTH_KEYWORD length
+                  (STMTEND | LEFT_CURLY_BRACE commonStatements RIGHT_CURLY_BRACE);
+
+    /**
+     *  pattern-stmt        = pattern-keyword sep string optsep
+     *                        (";" /
+     *                         "{" stmtsep
+     *                             ;; these stmts can appear in any order
+     *                             [error-message-stmt stmtsep]
+     *                             [error-app-tag-stmt stmtsep]
+     *                             [description-stmt stmtsep]
+     *                             [reference-stmt stmtsep]
+     *                          "}")
+     */
+    patternStatement : PATTERN_KEYWORD string (STMTEND | LEFT_CURLY_BRACE commonStatements RIGHT_CURLY_BRACE);
+
+    /**
+     *  default-stmt        = default-keyword sep string stmtend
+     */
+    defaultStatement : DEFAULT_KEYWORD string STMTEND;
+
+    /**
+     *  enum-specification  = 1*(enum-stmt stmtsep)
+     */
+    enumSpecification : enumStatement+;
+
+    /**
+     *  enum-stmt           = enum-keyword sep string optsep
+     *                        (";" /
+     *                         "{" stmtsep
+     *                             ;; these stmts can appear in any order
+     *                             [value-stmt stmtsep]
+     *                             [status-stmt stmtsep]
+     *                             [description-stmt stmtsep]
+     *                             [reference-stmt stmtsep]
+     *                          "}")
+     */
+    enumStatement : ENUM_KEYWORD string (STMTEND | LEFT_CURLY_BRACE enumStatementBody RIGHT_CURLY_BRACE);
+
+    enumStatementBody : valueStatement? statusStatement? descriptionStatement? referenceStatement?
+                   | valueStatement? statusStatement? referenceStatement? descriptionStatement?
+                   | valueStatement? descriptionStatement? statusStatement? referenceStatement?
+                   | valueStatement? descriptionStatement? referenceStatement? statusStatement?
+                   | valueStatement? referenceStatement? statusStatement? descriptionStatement?
+                   | valueStatement? referenceStatement? descriptionStatement? statusStatement?
+                   | statusStatement? valueStatement? descriptionStatement? referenceStatement?
+                   | statusStatement? valueStatement? referenceStatement? descriptionStatement?
+                   | statusStatement? descriptionStatement? descriptionStatement? valueStatement?
+                   | statusStatement? descriptionStatement? valueStatement? descriptionStatement?
+                   | statusStatement? referenceStatement? valueStatement? descriptionStatement?
+                   | statusStatement? referenceStatement? descriptionStatement? valueStatement?
+                   | descriptionStatement? valueStatement? statusStatement? referenceStatement?
+                   | descriptionStatement? valueStatement? referenceStatement? statusStatement?
+                   | descriptionStatement? statusStatement? valueStatement? referenceStatement?
+                   | descriptionStatement? statusStatement? referenceStatement? valueStatement?
+                   | descriptionStatement? referenceStatement? valueStatement? statusStatement?
+                   | descriptionStatement? referenceStatement? statusStatement? valueStatement?
+                   | referenceStatement? valueStatement? descriptionStatement? statusStatement?
+                   | referenceStatement? valueStatement? statusStatement? descriptionStatement?
+                   | referenceStatement? statusStatement? descriptionStatement? valueStatement?
+                   | referenceStatement? statusStatement? valueStatement? descriptionStatement?
+                   | referenceStatement? descriptionStatement? valueStatement? statusStatement?
+                   | referenceStatement? descriptionStatement? statusStatement? valueStatement?
+                   ;
+
+    /**
+     *  leafref-specification =
+     *                        ;; these stmts can appear in any order
+     *                        path-stmt stmtsep
+     *                        [require-instance-stmt stmtsep]
+     */
+    leafrefSpecification : (pathStatement (requireInstanceStatement)?) | ((requireInstanceStatement)? pathStatement);
+
+    /**
+     *  path-stmt           = path-keyword sep path-arg-str stmtend
+     */
+    pathStatement : PATH_KEYWORD path STMTEND;
+
+    /**
+     *  require-instance-stmt = require-instance-keyword sep
+     *                           require-instance-arg-str stmtend
+     *  require-instance-arg-str = < a string that matches the rule
+     *                             require-instance-arg >
+     *  require-instance-arg = true-keyword / false-keyword
+     */
+    requireInstanceStatement : REQUIRE_INSTANCE_KEYWORD (TRUE_KEYWORD | FALSE_KEYWORD) STMTEND;
+
+    /**
+     *  instance-identifier-specification =
+     *                        [require-instance-stmt stmtsep]
+     */
+    instanceIdentifierSpecification : requireInstanceStatement?;
+
+    /**
+     * identityref-specification =
+     *                        base-stmt stmtsep
+     */
+    identityrefSpecification : baseStatement;
+
+    /**
+     *  union-specification = 1*(type-stmt stmtsep)
+     */
+    unionSpecification : typeStatement+;
+
+    /**
+     *  bits-specification  = 1*(bit-stmt stmtsep)
+     */
+    bitsSpecification : bitStatement+;
+
+    /**
+     * bit-stmt            = bit-keyword sep identifier-arg-str optsep
+     *                       (";" /
+     *                        "{" stmtsep
+     *                            ;; these stmts can appear in any order
+     *                            [position-stmt stmtsep]
+     *                            [status-stmt stmtsep]
+     *                            [description-stmt stmtsep]
+     *                            [reference-stmt stmtsep]
+     *                          "}"
+     *                        "}")
+     */
+    bitStatement : BIT_KEYWORD identifier (STMTEND | LEFT_CURLY_BRACE bitBodyStatement RIGHT_CURLY_BRACE);
+
+    bitBodyStatement : positionStatement? statusStatement? descriptionStatement? referenceStatement?
+                  | positionStatement? statusStatement? referenceStatement? descriptionStatement?
+                  | positionStatement? descriptionStatement? statusStatement? referenceStatement?
+                  | positionStatement? descriptionStatement? referenceStatement? statusStatement?
+                  | positionStatement? referenceStatement? statusStatement? descriptionStatement?
+                  | positionStatement? referenceStatement? descriptionStatement? statusStatement?
+                  | statusStatement? positionStatement? descriptionStatement? referenceStatement?
+                  | statusStatement? positionStatement? referenceStatement? descriptionStatement?
+                  | statusStatement? descriptionStatement? descriptionStatement? positionStatement?
+                  | statusStatement? descriptionStatement? positionStatement? descriptionStatement?
+                  | statusStatement? referenceStatement? positionStatement? descriptionStatement?
+                  | statusStatement? referenceStatement? descriptionStatement? positionStatement?
+                  | descriptionStatement? positionStatement? statusStatement? referenceStatement?
+                  | descriptionStatement? positionStatement? referenceStatement? statusStatement?
+                  | descriptionStatement? statusStatement? positionStatement? referenceStatement?
+                  | descriptionStatement? statusStatement? referenceStatement? positionStatement?
+                  | descriptionStatement? referenceStatement? positionStatement? statusStatement?
+                  | descriptionStatement? referenceStatement? statusStatement? positionStatement?
+                  | referenceStatement? positionStatement? descriptionStatement? statusStatement?
+                  | referenceStatement? positionStatement? statusStatement? descriptionStatement?
+                  | referenceStatement? statusStatement? descriptionStatement? positionStatement?
+                  | referenceStatement? statusStatement? positionStatement? descriptionStatement?
+                  | referenceStatement? descriptionStatement? positionStatement? statusStatement?
+                  | referenceStatement? descriptionStatement? statusStatement? positionStatement?
+                  ;
+
+    /**
+     *  position-stmt       = position-keyword sep
+     *                        position-value-arg-str stmtend
+     *  position-value-arg-str = < a string that matches the rule
+     *                              position-value-arg >
+     *  position-value-arg  = non-negative-integer-value
+     */
+    positionStatement : POSITION_KEYWORD position STMTEND;
+
+    /**
+     *  status-stmt         = status-keyword sep status-arg-str stmtend
+     *  status-arg-str      = < a string that matches the rule
+     *                         status-arg >
+     *  status-arg          = current-keyword /
+     *                        obsolete-keyword /
+     *                        deprecated-keyword
+     */
+    statusStatement : STATUS_KEYWORD status STMTEND;
+
+    /**
+     *  config-stmt         = config-keyword sep
+     *                        config-arg-str stmtend
+     *  config-arg-str      = < a string that matches the rule
+     *                          config-arg >
+     *  config-arg          = true-keyword / false-keyword
+     */
+    configStatement : CONFIG_KEYWORD config STMTEND;
+
+    /**
+     *  mandatory-stmt      = mandatory-keyword sep
+     *                        mandatory-arg-str stmtend
+     *
+     *  mandatory-arg-str   = < a string that matches the rule
+     *                          mandatory-arg >
+     *
+     *  mandatory-arg       = true-keyword / false-keyword
+     */
+    mandatoryStatement : MANDATORY_KEYWORD mandatory STMTEND;
+
+    /**
+     *  presence-stmt       = presence-keyword sep string stmtend
+     */
+    presenceStatement : PRESENCE_KEYWORD string STMTEND;
+
+    /**
+     *  ordered-by-stmt     = ordered-by-keyword sep
+     *                        ordered-by-arg-str stmtend
+     *
+     *  ordered-by-arg-str  = < a string that matches the rule
+     *                          ordered-by-arg >
+     *
+     *  ordered-by-arg      = user-keyword / system-keyword
+     */
+    orderedByStatement : ORDERED_BY_KEYWORD orderedBy STMTEND;
+
+    /**
+     *  must-stmt           = must-keyword sep string optsep
+     *                        (";" /
+     *                         "{" stmtsep
+     *                             ;; these stmts can appear in any order
+     *                             [error-message-stmt stmtsep]
+     *                             [error-app-tag-stmt stmtsep]
+     *                             [description-stmt stmtsep]
+     *                             [reference-stmt stmtsep]
+     *                          "}")
+     */
+    mustStatement : MUST_KEYWORD string (STMTEND | LEFT_CURLY_BRACE commonStatements RIGHT_CURLY_BRACE);
+
+    /**
+     *   error-message-stmt  = error-message-keyword sep string stmtend
+     */
+    errorMessageStatement : ERROR_MESSAGE_KEYWORD string STMTEND;
+
+    /**
+     *  error-app-tag-stmt  = error-app-tag-keyword sep string stmtend
+     */
+    errorAppTagStatement : ERROR_APP_TAG_KEYWORD string STMTEND;
+
+    /**
+     *  min-elements-stmt   = min-elements-keyword sep
+     *                        min-value-arg-str stmtend
+     *  min-value-arg-str   = < a string that matches the rule
+     *                          min-value-arg >
+     *  min-value-arg       = non-negative-integer-value
+     */
+    minElementsStatement : MIN_ELEMENTS_KEYWORD minValue STMTEND;
+
+    /**
+     *  max-elements-stmt   = max-elements-keyword sep
+     *                        max-value-arg-str stmtend
+     *  max-value-arg-str   = < a string that matches the rule
+     *                          max-value-arg >
+     *  max-value-arg       = unbounded-keyword /
+     *                        positive-integer-value
+     */
+    maxElementsStatement :  MAX_ELEMENTS_KEYWORD maxValue STMTEND;
+
+    /**
+     *  value-stmt          = value-keyword sep integer-value stmtend
+     */
+    valueStatement : VALUE_KEYWORD value STMTEND;
+
+    /**
+     *   grouping-stmt       = grouping-keyword sep identifier-arg-str optsep
+     *                        (";" /
+     *                         "{" stmtsep
+     *                            ;; these stmts can appear in any order
+     *                            [status-stmt stmtsep]
+     *                             [description-stmt stmtsep]
+     *                             [reference-stmt stmtsep]
+     *                             *((typedef-stmt /
+     *                                grouping-stmt) stmtsep)
+     *                             *(data-def-stmt stmtsep)
+     *                         "}")
+     * TODO : 0..1 occurance to be checked in listener
+     */
+    groupingStatement : GROUPING_KEYWORD identifier (STMTEND | LEFT_CURLY_BRACE
+                      (statusStatement | descriptionStatement | referenceStatement | typedefStatement | groupingStatement
+                       | dataDefStatement)* RIGHT_CURLY_BRACE);
+
+    /**
+     *  container-stmt      = container-keyword sep identifier-arg-str optsep
+     *                        (";" /
+     *                         "{" stmtsep
+     *                             ;; these stmts can appear in any order
+     *                             [when-stmt stmtsep]
+     *                             *(if-feature-stmt stmtsep)
+     *                             *(must-stmt stmtsep)
+     *                             [presence-stmt stmtsep]
+     *                             [config-stmt stmtsep]
+     *                             [status-stmt stmtsep]
+     *                             [description-stmt stmtsep]
+     *                             [reference-stmt stmtsep]
+     *                             *((typedef-stmt /
+     *                                grouping-stmt) stmtsep)
+     *                             *(data-def-stmt stmtsep)
+     *                         "}")
+     * TODO : 0..1 occurance to be checked in listener
+     */
+    containerStatement : CONTAINER_KEYWORD identifier
+                     (STMTEND | LEFT_CURLY_BRACE (whenStatement | ifFeatureStatement | mustStatement | presenceStatement | configStatement
+                     | statusStatement | descriptionStatement | referenceStatement | typedefStatement | groupingStatement
+                     | dataDefStatement)* RIGHT_CURLY_BRACE);
+
+    /**
+     *  leaf-stmt           = leaf-keyword sep identifier-arg-str optsep
+     *                        "{" stmtsep
+     *                            ;; these stmts can appear in any order
+     *                            [when-stmt stmtsep]
+     *                            *(if-feature-stmt stmtsep)
+     *                            type-stmt stmtsep
+     *                            [units-stmt stmtsep]
+     *                            *(must-stmt stmtsep)
+     *                            [default-stmt stmtsep]
+     *                            [config-stmt stmtsep]
+     *                            [mandatory-stmt stmtsep]
+     *                            [status-stmt stmtsep]
+     *                            [description-stmt stmtsep]
+     *                            [reference-stmt stmtsep]
+     *                         "}"
+     * TODO : 0..1 occurance to be checked in listener
+     */
+    leafStatement : LEAF_KEYWORD identifier LEFT_CURLY_BRACE (whenStatement | ifFeatureStatement | typeStatement | unitsStatement
+              | mustStatement | defaultStatement | configStatement | mandatoryStatement | statusStatement  | descriptionStatement
+              | referenceStatement)* RIGHT_CURLY_BRACE;
+
+    /**
+     *  leaf-list-stmt      = leaf-list-keyword sep identifier-arg-str optsep
+     *                        "{" stmtsep
+     *                            ;; these stmts can appear in any order
+     *                            [when-stmt stmtsep]
+     *                            *(if-feature-stmt stmtsep)
+     *                            type-stmt stmtsep
+     *                            [units-stmt stmtsep]
+     *                            *(must-stmt stmtsep)
+     *                            [config-stmt stmtsep]
+     *                            [min-elements-stmt stmtsep]
+     *                            [max-elements-stmt stmtsep]
+     *                            [ordered-by-stmt stmtsep]
+     *                            [status-stmt stmtsep]
+     *                            [description-stmt stmtsep]
+     *                            [reference-stmt stmtsep]
+     *                         "}"
+     * TODO : 0..1 occurance to be checked in listener
+     */
+    leafListStatement : LEAF_LIST_KEYWORD identifier LEFT_CURLY_BRACE (whenStatement | ifFeatureStatement | typeStatement
+                     | unitsStatement | mustStatement | configStatement | minElementsStatement | maxElementsStatement | orderedByStatement
+                     | statusStatement | descriptionStatement | referenceStatement)* RIGHT_CURLY_BRACE;
+
+    /**
+     *  list-stmt           = list-keyword sep identifier-arg-str optsep
+     *                        "{" stmtsep
+     *                            ;; these stmts can appear in any order
+     *                            [when-stmt stmtsep]
+     *                            *(if-feature-stmt stmtsep)
+     *                            *(must-stmt stmtsep)
+     *                            [key-stmt stmtsep]
+     *                            *(unique-stmt stmtsep)
+     *                            [config-stmt stmtsep]
+     *                            [min-elements-stmt stmtsep]
+     *                            [max-elements-stmt stmtsep]
+     *                            [ordered-by-stmt stmtsep]
+     *                            [status-stmt stmtsep]
+     *                            [description-stmt stmtsep]
+     *                            [reference-stmt stmtsep]
+     *                            *((typedef-stmt /
+     *                               grouping-stmt) stmtsep)
+     *                            1*(data-def-stmt stmtsep)
+     *                         "}"
+     * TODO : 0..1 occurance to be checked in listener
+     */
+    listStatement : LIST_KEYWORD identifier LEFT_CURLY_BRACE (whenStatement | ifFeatureStatement | mustStatement | keyStatement
+              | uniqueStatement | configStatement | minElementsStatement | maxElementsStatement | orderedByStatement | statusStatement
+              | descriptionStatement | referenceStatement | typedefStatement | groupingStatement| dataDefStatement)* RIGHT_CURLY_BRACE;
+
+    /**
+     *  key-stmt            = key-keyword sep key-arg-str stmtend
+     */
+    keyStatement : KEY_KEYWORD key STMTEND;
+
+    /**
+     *  unique-stmt         = unique-keyword sep unique-arg-str stmtend
+     */
+    uniqueStatement: UNIQUE_KEYWORD unique STMTEND;
+
+    /**
+     *  choice-stmt         = choice-keyword sep identifier-arg-str optsep
+     *                        (";" /
+     *                         "{" stmtsep
+     *                             ;; these stmts can appear in any order
+     *                             [when-stmt stmtsep]
+     *                             *(if-feature-stmt stmtsep)
+     *                             [default-stmt stmtsep]
+     *                             [config-stmt stmtsep]
+     *                             [mandatory-stmt stmtsep]
+     *                             [status-stmt stmtsep]
+     *                             [description-stmt stmtsep]
+     *                             [reference-stmt stmtsep]
+     *                             *((short-case-stmt / case-stmt) stmtsep)
+     *                         "}")
+     * TODO : 0..1 occurance to be checked in listener
+     */
+    choiceStatement : CHOICE_KEYWORD identifier (STMTEND | LEFT_CURLY_BRACE (whenStatement | ifFeatureStatement | defaultStatement
+                  | configStatement | mandatoryStatement | statusStatement | descriptionStatement | referenceStatement | shortCaseStatement
+                  | caseStatement)* RIGHT_CURLY_BRACE);
+
+    /**
+     *  short-case-stmt     = container-stmt /
+     *                        leaf-stmt /
+     *                        leaf-list-stmt /
+     *                        list-stmt /
+     *                        anyxml-stmt
+     */
+    shortCaseStatement : containerStatement | leafStatement | leafListStatement | listStatement | anyxmlStatement;
+
+    /**
+     *  case-stmt           = case-keyword sep identifier-arg-str optsep
+     *                        (";" /
+     *                         "{" stmtsep
+     *                             ;; these stmts can appear in any order
+     *                             [when-stmt stmtsep]
+     *                             *(if-feature-stmt stmtsep)
+     *                             [status-stmt stmtsep]
+     *                             [description-stmt stmtsep]
+     *                             [reference-stmt stmtsep]
+     *                             *(data-def-stmt stmtsep)
+     *                         "}")
+     * TODO : 0..1 occurance to be checked in listener
+     */
+    caseStatement : CASE_KEYWORD identifier (STMTEND | LEFT_CURLY_BRACE (whenStatement | ifFeatureStatement | statusStatement
+              | descriptionStatement | referenceStatement | dataDefStatement)* RIGHT_CURLY_BRACE);
+
+    /**
+     *    anyxml-stmt         = anyxml-keyword sep identifier-arg-str optsep
+     *                         (";" /
+     *                         "{" stmtsep
+     *                             ;; these stmts can appear in any order
+     *                             [when-stmt stmtsep]
+     *                             *(if-feature-stmt stmtsep)
+     *                             *(must-stmt stmtsep)
+     *                             [config-stmt stmtsep]
+     *                             [mandatory-stmt stmtsep]
+     *                             [status-stmt stmtsep]
+     *                             [description-stmt stmtsep]
+     *                             [reference-stmt stmtsep]
+     *                          "}")
+     */
+     anyxmlStatement : ANYXML_KEYWORD identifier (STMTEND | LEFT_CURLY_BRACE (whenStatement | ifFeatureStatement
+                     | mustStatement | configStatement | mandatoryStatement | statusStatement | descriptionStatement
+                     | referenceStatement)* RIGHT_CURLY_BRACE);
+
+    /**
+     *  uses-stmt           = uses-keyword sep identifier-ref-arg-str optsep
+     *                        (";" /
+     *                         "{" stmtsep
+     *                             ;; these stmts can appear in any order
+     *                             [when-stmt stmtsep]
+     *                             *(if-feature-stmt stmtsep)
+     *                             [status-stmt stmtsep]
+     *                             [description-stmt stmtsep]
+     *                             [reference-stmt stmtsep]
+     *                             *(refine-stmt stmtsep)
+     *                             *(uses-augment-stmt stmtsep)
+     *                         "}")
+     * TODO : 0..1 occurance to be checked in listener
+     */
+    usesStatement : USES_KEYWORD string (STMTEND | LEFT_CURLY_BRACE (whenStatement | ifFeatureStatement | statusStatement
+                | descriptionStatement | referenceStatement | refineStatement | augmentStatement)* RIGHT_CURLY_BRACE);
+
+    /**
+     *  refine-stmt         = refine-keyword sep refine-arg-str optsep
+     *                        (";" /
+     *                         "{" stmtsep
+     *                             (refine-container-stmts /
+     *                              refine-leaf-stmts /
+     *                              refine-leaf-list-stmts /
+     *                              refine-list-stmts /
+     *                              refine-choice-stmts /
+     *                              refine-case-stmts /
+     *                              refine-anyxml-stmts)
+     *                         "}")
+     */
+    refineStatement : REFINE_KEYWORD refine (STMTEND  | LEFT_CURLY_BRACE (refineContainerStatements
+                    | refineLeafStatements | refineLeafListStatements | refineListStatements | refineChoiceStatements
+                    | refineCaseStatements | refineAnyxmlStatements) RIGHT_CURLY_BRACE);
+
+    /**
+     *  refine-container-stmts =
+     *                        ;; these stmts can appear in any order
+     *                        *(must-stmt stmtsep)
+     *                        [presence-stmt stmtsep]
+     *                        [config-stmt stmtsep]
+     *                        [description-stmt stmtsep]
+     *                         [reference-stmt stmtsep]
+     * TODO : 0..1 occurance to be checked in listener
+     */
+    refineContainerStatements : (mustStatement | presenceStatement | configStatement | descriptionStatement | referenceStatement)* ;
+
+    /**
+     *   refine-leaf-stmts   = ;; these stmts can appear in any order
+     *                         *(must-stmt stmtsep)
+     *                         [default-stmt stmtsep]
+     *                         [config-stmt stmtsep]
+     *                        [mandatory-stmt stmtsep]
+     *                        [description-stmt stmtsep]
+     *                        [reference-stmt stmtsep]
+     * TODO : 0..1 occurance to be checked in listener
+     */
+    refineLeafStatements : (mustStatement | defaultStatement | configStatement | mandatoryStatement | descriptionStatement | referenceStatement)*;
+
+    /**
+     *  refine-leaf-list-stmts =
+     *                        ;; these stmts can appear in any order
+     *                        *(must-stmt stmtsep)
+     *                        [config-stmt stmtsep]
+     *                        [min-elements-stmt stmtsep]
+     *                        [max-elements-stmt stmtsep]
+     *                        [description-stmt stmtsep]
+     *                        [reference-stmt stmtsep]
+     * TODO : 0..1 occurance to be checked in listener
+     */
+    refineLeafListStatements : (mustStatement | configStatement | minElementsStatement | maxElementsStatement | descriptionStatement
+                             | referenceStatement)*;
+
+    /**
+     *  refine-list-stmts   = ;; these stmts can appear in any order
+     *                        *(must-stmt stmtsep)
+     *                        [config-stmt stmtsep]
+     *                        [min-elements-stmt stmtsep]
+     *                        [max-elements-stmt stmtsep]
+     *                        [description-stmt stmtsep]
+     *                        [reference-stmt stmtsep]
+     * TODO : 0..1 occurance to be checked in listener
+     */
+    refineListStatements : (mustStatement | configStatement | minElementsStatement | maxElementsStatement | descriptionStatement
+                        | referenceStatement)*;
+
+    /**
+     *  refine-choice-stmts = ;; these stmts can appear in any order
+     *                        [default-stmt stmtsep]
+     *                        [config-stmt stmtsep]
+     *                        [mandatory-stmt stmtsep]
+     *                        [description-stmt stmtsep]
+     *                        [reference-stmt stmtsep]
+     * TODO : 0..1 occurance to be checked in listener
+     */
+    refineChoiceStatements : (defaultStatement | configStatement | mandatoryStatement | descriptionStatement | referenceStatement)*;
+
+    /**
+     *  refine-case-stmts   = ;; these stmts can appear in any order
+     *                        [description-stmt stmtsep]
+     *                        [reference-stmt stmtsep]
+     *
+     */
+    refineCaseStatements : (descriptionStatement | referenceStatement)? | (referenceStatement | descriptionStatement)?;
+
+    /**
+     *  refine-anyxml-stmts = ;; these stmts can appear in any order
+     *                        *(must-stmt stmtsep)
+     *                        [config-stmt stmtsep]
+     *                        [mandatory-stmt stmtsep]
+     *                        [description-stmt stmtsep]
+     *                        [reference-stmt stmtsep]
+     */
+     refineAnyxmlStatements : (mustStatement | configStatement | mandatoryStatement | descriptionStatement
+                            | referenceStatement)*;
+
+    /**
+     *  augment-stmt        = augment-keyword sep augment-arg-str optsep
+     *                        "{" stmtsep
+     *                            ;; these stmts can appear in any order
+     *                            [when-stmt stmtsep]
+     *                            *(if-feature-stmt stmtsep)
+     *                            [status-stmt stmtsep]
+     *                            [description-stmt stmtsep]
+     *                            [reference-stmt stmtsep]
+     *                            1*((data-def-stmt stmtsep) /
+     *                               (case-stmt stmtsep))
+     *                         "}"
+     * TODO : 0..1 occurance to be checked in listener
+     */
+    augmentStatement : AUGMENT_KEYWORD augment LEFT_CURLY_BRACE (whenStatement | ifFeatureStatement | statusStatement
+                   | descriptionStatement | referenceStatement | dataDefStatement  | caseStatement)* RIGHT_CURLY_BRACE;
+
+    /**
+     *  when-stmt           = when-keyword sep string optsep
+     *                        (";" /
+     *                         "{" stmtsep
+     *                             ;; these stmts can appear in any order
+     *                             [description-stmt stmtsep]
+     *                             [reference-stmt stmtsep]
+     *                          "}")
+     *
+     */
+    whenStatement : WHEN_KEYWORD string (STMTEND | LEFT_CURLY_BRACE ((descriptionStatement? referenceStatement?)
+                       | (referenceStatement? descriptionStatement?)) RIGHT_CURLY_BRACE);
+
+    /**
+     *  rpc-stmt            = rpc-keyword sep identifier-arg-str optsep
+     *                        (";" /
+     *                         "{" stmtsep
+     *                             ;; these stmts can appear in any order
+     *                             *(if-feature-stmt stmtsep)
+     *                             [status-stmt stmtsep]
+     *                             [description-stmt stmtsep]
+     *                             [reference-stmt stmtsep]
+     *                             *((typedef-stmt /
+     *                                grouping-stmt) stmtsep)
+     *                             [input-stmt stmtsep]
+     *                             [output-stmt stmtsep]
+     *                         "}")
+     */
+    rpcStatement : RPC_KEYWORD identifier (STMTEND | LEFT_CURLY_BRACE (ifFeatureStatement | statusStatement | descriptionStatement
+                | referenceStatement | typedefStatement | groupingStatement | inputStatement | outputStatement)* RIGHT_CURLY_BRACE);
+
+    /**
+     * input-stmt          = input-keyword optsep
+     *                       "{" stmtsep
+     *                           ;; these stmts can appear in any order
+     *                           *((typedef-stmt /
+     *                              grouping-stmt) stmtsep)
+     *                           1*(data-def-stmt stmtsep)
+     *                         "}"
+     */
+    inputStatement : INPUT_KEYWORD LEFT_CURLY_BRACE (typedefStatement | groupingStatement | dataDefStatement)* RIGHT_CURLY_BRACE;
+
+    /**
+     *  output-stmt         = output-keyword optsep
+     *                        "{" stmtsep
+     *                            ;; these stmts can appear in any order
+     *                            *((typedef-stmt /
+     *                               grouping-stmt) stmtsep)
+     *                            1*(data-def-stmt stmtsep)
+     *                        "}"
+     */
+    outputStatement : OUTPUT_KEYWORD LEFT_CURLY_BRACE (typedefStatement | groupingStatement | dataDefStatement)* RIGHT_CURLY_BRACE;
+
+    /**
+     *  notification-stmt   = notification-keyword sep
+     *                        identifier-arg-str optsep
+     *                        (";" /
+     *                         "{" stmtsep
+     *                             ;; these stmts can appear in any order
+     *                             *(if-feature-stmt stmtsep)
+     *                             [status-stmt stmtsep]
+     *                             [description-stmt stmtsep]
+     *                             [reference-stmt stmtsep]
+     *                             *((typedef-stmt /
+     *                                grouping-stmt) stmtsep)
+     *                             *(data-def-stmt stmtsep)
+     *                         "}")
+     * TODO : 0..1 occurance to be checked in listener
+     */
+     notificationStatement : NOTIFICATION_KEYWORD identifier (STMTEND | LEFT_CURLY_BRACE (ifFeatureStatement
+                           | statusStatement | descriptionStatement | referenceStatement | typedefStatement
+                           | groupingStatement | dataDefStatement)* RIGHT_CURLY_BRACE);
+
+    /**
+     *  deviation-stmt      = deviation-keyword sep
+     *                        deviation-arg-str optsep
+     *                        "{" stmtsep
+     *                            ;; these stmts can appear in any order
+     *                            [description-stmt stmtsep]
+     *                            [reference-stmt stmtsep]
+     *                            (deviate-not-supported-stmt /
+     *                              1*(deviate-add-stmt /
+     *                                 deviate-replace-stmt /
+     *                                 deviate-delete-stmt))
+     *                        "}"
+     * TODO : 0..1 occurance to be checked in listener
+     */
+    deviationStatement: DEVIATION_KEYWORD deviation LEFT_CURLY_BRACE (descriptionStatement | referenceStatement
+                      | deviateNotSupportedStatement | deviateAddStatement | deviateReplaceStatement
+                      | deviateDeleteStatement)* RIGHT_CURLY_BRACE;
+
+    /**
+     * deviate-not-supported-stmt =
+     *                       deviate-keyword sep
+     *                       not-supported-keyword optsep
+     *                       (";" /
+     *                        "{" stmtsep
+     *                        "}")
+     */
+    deviateNotSupportedStatement: DEVIATE_KEYWORD NOT_SUPPORTED_KEYWORD (STMTEND | LEFT_CURLY_BRACE RIGHT_CURLY_BRACE);
+
+    /**
+     *  deviate-add-stmt    = deviate-keyword sep add-keyword optsep
+     *                        (";" /
+     *                         "{" stmtsep
+     *                             [units-stmt stmtsep]
+     *                             *(must-stmt stmtsep)
+     *                             *(unique-stmt stmtsep)
+     *                             [default-stmt stmtsep]
+     *                             [config-stmt stmtsep]
+     *                             [mandatory-stmt stmtsep]
+     *                             [min-elements-stmt stmtsep]
+     *                             [max-elements-stmt stmtsep]
+     *                         "}")
+     */
+    deviateAddStatement: DEVIATE_KEYWORD ADD_KEYWORD (STMTEND | (LEFT_CURLY_BRACE unitsStatement? mustStatement* uniqueStatement*
+                      defaultStatement? configStatement? mandatoryStatement? minElementsStatement? maxElementsStatement?
+                      RIGHT_CURLY_BRACE));
+
+    /**
+     *  deviate-delete-stmt = deviate-keyword sep delete-keyword optsep
+     *                        (";" /
+     *                         "{" stmtsep
+     *                             [units-stmt stmtsep]
+     *                             *(must-stmt stmtsep)
+     *                             *(unique-stmt stmtsep)
+     *                               [default-stmt stmtsep]
+     *                           "}")
+     */
+    deviateDeleteStatement: DEVIATE_KEYWORD DELETE_KEYWORD (STMTEND
+                       | (LEFT_CURLY_BRACE  unitsStatement? mustStatement* uniqueStatement* defaultStatement? RIGHT_CURLY_BRACE));
+
+    /**
+     *   deviate-replace-stmt = deviate-keyword sep replace-keyword optsep
+     *                         (";" /
+     *                          "{" stmtsep
+     *                              [type-stmt stmtsep]
+     *                              [units-stmt stmtsep]
+     *                              [default-stmt stmtsep]
+     *                              [config-stmt stmtsep]
+     *                              [mandatory-stmt stmtsep]
+     *                              [min-elements-stmt stmtsep]
+     *                              [max-elements-stmt stmtsep]
+     *                          "}")
+     */
+    deviateReplaceStatement: DEVIATE_KEYWORD REPLACE_KEYWORD (STMTEND | (LEFT_CURLY_BRACE typeStatement? unitsStatement?
+                           defaultStatement? configStatement? mandatoryStatement? minElementsStatement?
+                           maxElementsStatement? RIGHT_CURLY_BRACE));
+
+    string : STRING (PLUS STRING)*
+           | IDENTIFIER
+           | INTEGER
+           | yangConstruct;
+
+    identifier : STRING (PLUS STRING)*
+               | IDENTIFIER
+               | yangConstruct;
+
+    dateArgumentString : DATE_ARG
+                       | STRING (PLUS STRING)*;
+
+    version : string;
+
+    range : string;
+
+    length : string;
+
+    path : string;
+
+    position : string;
+
+    status : string;
+
+    config : string;
+
+    mandatory : string;
+
+    orderedBy : string;
+
+    minValue : string;
+
+    maxValue : string;
+
+    key : string;
+
+    unique : string;
+
+    refine : string;
+
+    augment : string;
+
+    deviation : string;
+
+    value : string;
+
+    fraction : string;
+
+    yangConstruct : ANYXML_KEYWORD | ARGUMENT_KEYWORD | AUGMENT_KEYWORD | BASE_KEYWORD | BELONGS_TO_KEYWORD
+                  | BIT_KEYWORD | CASE_KEYWORD | CHOICE_KEYWORD | CONFIG_KEYWORD | CONTACT_KEYWORD | CONTAINER_KEYWORD
+                  | DEFAULT_KEYWORD | DESCRIPTION_KEYWORD | ENUM_KEYWORD ERROR_APP_TAG_KEYWORD | ERROR_MESSAGE_KEYWORD
+                  | EXTENSION_KEYWORD | DEVIATION_KEYWORD | DEVIATE_KEYWORD | FEATURE_KEYWORD
+                  | FRACTION_DIGITS_KEYWORD | GROUPING_KEYWORD | IDENTITY_KEYWORD | IF_FEATURE_KEYWORD
+                  | IMPORT_KEYWORD | INCLUDE_KEYWORD | INPUT_KEYWORD | KEY_KEYWORD | LEAF_KEYWORD | LEAF_LIST_KEYWORD
+                  | LENGTH_KEYWORD | LIST_KEYWORD | MANDATORY_KEYWORD | MAX_ELEMENTS_KEYWORD | MIN_ELEMENTS_KEYWORD
+                  | MODULE_KEYWORD | MUST_KEYWORD | NAMESPACE_KEYWORD | NOTIFICATION_KEYWORD | ORDERED_BY_KEYWORD
+                  | ORGANIZATION_KEYWORD | OUTPUT_KEYWORD | PATH_KEYWORD | PATTERN_KEYWORD |POSITION_KEYWORD
+                  | PREFIX_KEYWORD | PRESENCE_KEYWORD | RANGE_KEYWORD | REFERENCE_KEYWORD | REFINE_KEYWORD
+                  | REQUIRE_INSTANCE_KEYWORD | REVISION_KEYWORD | REVISION_DATE_KEYWORD | RPC_KEYWORD
+                  | STATUS_KEYWORD | SUBMODULE_KEYWORD | TYPE_KEYWORD | TYPEDEF_KEYWORD | UNIQUE_KEYWORD
+                  | UNITS_KEYWORD | USES_KEYWORD | VALUE_KEYWORD | WHEN_KEYWORD | YANG_VERSION_KEYWORD
+                  | YIN_ELEMENT_KEYWORD | ADD_KEYWORD | CURRENT_KEYWORD | DELETE_KEYWORD | DEPRECATED_KEYWORD
+                  | FALSE_KEYWORD | MAX_KEYWORD | MIN_KEYWORD | NOT_SUPPORTED_KEYWORD | OBSOLETE_KEYWORD
+                  | REPLACE_KEYWORD | SYSTEM_KEYWORD | TRUE_KEYWORD | UNBOUNDED_KEYWORD | USER_KEYWORD;
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/main/resources/YangLexer.g4 b/utils/yangutils/plugin/src/main/resources/YangLexer.g4
new file mode 100644
index 0000000..da20fd8
--- /dev/null
+++ b/utils/yangutils/plugin/src/main/resources/YangLexer.g4
@@ -0,0 +1,137 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+/**
+ * This is a YANG grammar for lexer based on which ANTLR will generate YANG lexer.
+ */
+
+lexer grammar YangLexer;
+
+    // Statements keywords
+    ANYXML_KEYWORD      : 'anyxml';
+    ARGUMENT_KEYWORD    : 'argument';
+    AUGMENT_KEYWORD     : 'augment';
+    BASE_KEYWORD        : 'base';
+    BELONGS_TO_KEYWORD  : 'belongs-to';
+    BIT_KEYWORD         : 'bit';
+    CASE_KEYWORD        : 'case';
+    CHOICE_KEYWORD      : 'choice';
+    CONFIG_KEYWORD      : 'config';
+    CONTACT_KEYWORD     : 'contact';
+    CONTAINER_KEYWORD   : 'container';
+    DEFAULT_KEYWORD     : 'default';
+    DESCRIPTION_KEYWORD : 'description';
+    ENUM_KEYWORD        : 'enum';
+    ERROR_APP_TAG_KEYWORD : 'error-app-tag';
+    ERROR_MESSAGE_KEYWORD : 'error-message';
+    EXTENSION_KEYWORD   : 'extension';
+    DEVIATION_KEYWORD   : 'deviation';
+    DEVIATE_KEYWORD     : 'deviate';
+    FEATURE_KEYWORD     : 'feature';
+    FRACTION_DIGITS_KEYWORD : 'fraction-digits';
+    GROUPING_KEYWORD    : 'grouping';
+    IDENTITY_KEYWORD    : 'identity';
+    IF_FEATURE_KEYWORD  : 'if-feature';
+    IMPORT_KEYWORD      : 'import';
+    INCLUDE_KEYWORD     : 'include';
+    INPUT_KEYWORD       : 'input';
+    KEY_KEYWORD         : 'key';
+    LEAF_KEYWORD        : 'leaf';
+    LEAF_LIST_KEYWORD   : 'leaf-list';
+    LENGTH_KEYWORD      : 'length';
+    LIST_KEYWORD        : 'list';
+    MANDATORY_KEYWORD   : 'mandatory';
+    MAX_ELEMENTS_KEYWORD : 'max-elements';
+    MIN_ELEMENTS_KEYWORD : 'min-elements';
+    MODULE_KEYWORD      : 'module';
+    MUST_KEYWORD        : 'must';
+    NAMESPACE_KEYWORD   : 'namespace';
+    NOTIFICATION_KEYWORD: 'notification';
+    ORDERED_BY_KEYWORD  : 'ordered-by';
+    ORGANIZATION_KEYWORD: 'organization';
+    OUTPUT_KEYWORD      : 'output';
+    PATH_KEYWORD        : 'path';
+    PATTERN_KEYWORD     : 'pattern';
+    POSITION_KEYWORD    : 'position';
+    PREFIX_KEYWORD      : 'prefix';
+    PRESENCE_KEYWORD    : 'presence';
+    RANGE_KEYWORD       : 'range';
+    REFERENCE_KEYWORD   : 'reference';
+    REFINE_KEYWORD      : 'refine';
+    REQUIRE_INSTANCE_KEYWORD : 'require-instance';
+    REVISION_KEYWORD    : 'revision';
+    REVISION_DATE_KEYWORD : 'revision-date';
+    RPC_KEYWORD         : 'rpc';
+    STATUS_KEYWORD      : 'status';
+    SUBMODULE_KEYWORD   : 'submodule';
+    TYPE_KEYWORD        : 'type';
+    TYPEDEF_KEYWORD     : 'typedef';
+    UNIQUE_KEYWORD      : 'unique';
+    UNITS_KEYWORD       : 'units';
+    USES_KEYWORD        : 'uses';
+    VALUE_KEYWORD       : 'value';
+    WHEN_KEYWORD        : 'when';
+    YANG_VERSION_KEYWORD: 'yang-version';
+    YIN_ELEMENT_KEYWORD : 'yin-element';
+    ADD_KEYWORD         : 'add';
+    CURRENT_KEYWORD     : 'current';
+    DELETE_KEYWORD      : 'delete';
+    DEPRECATED_KEYWORD  : 'deprecated';
+    FALSE_KEYWORD       : 'false';
+    MAX_KEYWORD         : 'max';
+    MIN_KEYWORD         : 'min';
+    NOT_SUPPORTED_KEYWORD : 'not-supported';
+    OBSOLETE_KEYWORD    : 'obsolete';
+    REPLACE_KEYWORD     : 'replace';
+    SYSTEM_KEYWORD      : 'system';
+    TRUE_KEYWORD        : 'true';
+    UNBOUNDED_KEYWORD   : 'unbounded';
+    USER_KEYWORD        : 'user';
+
+    // Lexer tokens to be skipped
+    COMMENT
+        :   '/*' .*? '*/'    -> channel(HIDDEN)
+        ;
+    WS  :   [ \r\t\u000C\n]+ -> channel(HIDDEN)
+        ;
+    LINE_COMMENT
+        : '//' ~[\r\n]* '\r'? '\n' -> channel(HIDDEN)
+        ;
+
+    // Additional rules
+    INTEGER             : DIGIT+;
+    DATE_ARG            : DIGIT DIGIT DIGIT DIGIT '-' DIGIT DIGIT '-' DIGIT DIGIT;
+    LEFT_CURLY_BRACE    : '{';
+    RIGHT_CURLY_BRACE   : '}';
+    IDENTIFIER          : (ALPHA | '_')
+                          (ALPHA | DIGIT | '_' | '-' | '.')*;
+    STMTEND             : ';';
+    DQUOTE              : '"';
+    COLON               : ':';
+    PLUS : '+';
+    MINUS: '-';
+
+    STRING : ((~( '\r' | '\n' | '\t' | ' ' | ';' | '{' | '"' | '\'')~( '\r' | '\n' | '\t' | ' ' | ';' | '{' )* ) | SUB_STRING );
+
+    //Fragment rules
+    fragment SUB_STRING : ('"' (ESC | ~["])*'"') | ('\'' (ESC | ~['])*'\'') ;
+    fragment ESC :  '\\' (["\\/bfnrt] | UNICODE) ;
+    fragment UNICODE : 'u' HEX HEX HEX HEX ;
+    fragment HEX : [0-9a-fA-F] ;
+    fragment ALPHA      : [A-Za-z];
+    fragment DIGIT      : [0-9];
+    fragment URN        : [u][r][n];
+    fragment HTTP       : [h][t][t][p];
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/ietfyang/IetfYangFileTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/ietfyang/IetfYangFileTest.java
new file mode 100644
index 0000000..0f0a514
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/ietfyang/IetfYangFileTest.java
@@ -0,0 +1,63 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.ietfyang;
+
+import org.apache.maven.plugin.MojoExecutionException;
+import org.junit.Test;
+import org.onosproject.yangutils.linker.impl.YangLinkerManager;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
+import org.onosproject.yangutils.plugin.manager.YangUtilManager;
+import org.onosproject.yangutils.translator.tojava.utils.YangPluginConfig;
+import org.onosproject.yangutils.utils.io.impl.YangFileScanner;
+
+import java.io.IOException;
+
+import static org.onosproject.yangutils.utils.io.impl.YangIoUtils.deleteDirectory;
+
+/**
+ * Test cases for testing IETF YANG files.
+ */
+public class IetfYangFileTest {
+
+    private final YangUtilsParserManager manager = new YangUtilsParserManager();
+    private final YangUtilManager utilManager = new YangUtilManager();
+    private final YangLinkerManager yangLinkerManager = new YangLinkerManager();
+
+    /**
+     * Checks hierarchical intra with inter file type linking.
+     * Reference: https://datatracker.ietf.org/doc/draft-zha-l3sm-l3vpn-onos-deployment
+     */
+    @Test
+    public void l3vpnserviceyang()
+            throws IOException, ParserException, MojoExecutionException {
+
+        String searchDir = "src/test/resources/ietfyang/l3vpnservice";
+        utilManager.createYangFileInfoSet(YangFileScanner.getYangFiles(searchDir));
+        utilManager.parseYangFileInfoSet();
+        utilManager.resolveDependenciesUsingLinker();
+
+        String userDir = System.getProperty("user.dir");
+        YangPluginConfig yangPluginConfig = new YangPluginConfig();
+        yangPluginConfig.setCodeGenDir("target/ietfyang/l3vpnservice/");
+
+        utilManager.translateToJava(utilManager.getYangFileInfoSet(), yangPluginConfig);
+
+        deleteDirectory(userDir + "/target/ietfyang/");
+    }
+
+}
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/linker/InterFileLinkingTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/linker/InterFileLinkingTest.java
new file mode 100644
index 0000000..fd7b8ad
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/linker/InterFileLinkingTest.java
@@ -0,0 +1,741 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.linker;
+
+import java.io.IOException;
+import java.util.Iterator;
+import java.util.ListIterator;
+import org.apache.maven.plugin.MojoExecutionException;
+import org.junit.Test;
+import org.onosproject.yangutils.datamodel.YangDataTypes;
+import org.onosproject.yangutils.datamodel.YangDerivedInfo;
+import org.onosproject.yangutils.datamodel.YangGrouping;
+import org.onosproject.yangutils.datamodel.YangLeaf;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangNodeType;
+import org.onosproject.yangutils.datamodel.YangTypeDef;
+import org.onosproject.yangutils.datamodel.YangUses;
+import org.onosproject.yangutils.datamodel.utils.ResolvableStatus;
+import org.onosproject.yangutils.linker.impl.YangLinkerManager;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
+import org.onosproject.yangutils.plugin.manager.YangFileInfo;
+import org.onosproject.yangutils.plugin.manager.YangUtilManager;
+import org.onosproject.yangutils.translator.tojava.utils.YangPluginConfig;
+import org.onosproject.yangutils.utils.io.impl.YangFileScanner;
+
+import static org.hamcrest.CoreMatchers.nullValue;
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.core.Is.is;
+import static org.onosproject.yangutils.datamodel.YangDataTypes.DERIVED;
+import static org.onosproject.yangutils.datamodel.YangDataTypes.STRING;
+import static org.onosproject.yangutils.datamodel.YangNodeType.MODULE_NODE;
+import static org.onosproject.yangutils.datamodel.utils.ResolvableStatus.RESOLVED;
+import static org.onosproject.yangutils.utils.io.impl.YangIoUtils.deleteDirectory;
+
+/**
+ * Test cases for testing inter file linking.
+ */
+public class InterFileLinkingTest {
+
+    private final YangUtilsParserManager manager = new YangUtilsParserManager();
+    private final YangUtilManager utilManager = new YangUtilManager();
+    private final YangLinkerManager yangLinkerManager = new YangLinkerManager();
+
+    /**
+     * Checks inter file type linking.
+     */
+    @Test
+    public void processInterFileTypeLinking()
+            throws IOException, ParserException, MojoExecutionException {
+
+        String searchDir = "src/test/resources/interfiletype";
+        utilManager.createYangFileInfoSet(YangFileScanner.getYangFiles(searchDir));
+        utilManager.parseYangFileInfoSet();
+
+        YangNode refNode = null;
+        YangNode selfNode = null;
+
+        // Create YANG node set
+        yangLinkerManager.createYangNodeSet(utilManager.getYangFileInfoSet());
+
+        // Add references to import list.
+        yangLinkerManager.addRefToYangFilesImportList(utilManager.getYangFileInfoSet());
+
+        // Carry out inter-file linking.
+        yangLinkerManager.processInterFileLinking(utilManager.getYangFileInfoSet());
+
+        Iterator<YangFileInfo> yangFileInfoIterator = utilManager.getYangFileInfoSet().iterator();
+
+        YangFileInfo yangFileInfo = yangFileInfoIterator.next();
+
+        if (yangFileInfo.getRootNode().getName().equals("module1")) {
+            selfNode = yangFileInfo.getRootNode();
+            refNode = yangFileInfoIterator.next().getRootNode();
+        } else {
+            refNode = yangFileInfo.getRootNode();
+            selfNode = yangFileInfoIterator.next().getRootNode();
+        }
+
+        // Check whether the data model tree returned is of type module.
+        assertThat(selfNode instanceof YangModule, is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(selfNode.getNodeType(), is(MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) selfNode;
+        assertThat(yangNode.getName(), is("module1"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("hello"));
+        assertThat(leafInfo.getDataType().getDataType(), is(DERIVED));
+
+        assertThat(((YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo()).getReferredTypeDef(),
+                is((YangTypeDef) refNode.getChild()));
+
+        assertThat(leafInfo.getDataType().getResolvableStatus(), is(RESOLVED));
+
+        YangDerivedInfo<?> derivedInfo = (YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo();
+
+        // Check for the effective built-in type.
+        assertThat(derivedInfo.getEffectiveBuiltInType(), is(STRING));
+
+        // Check for the restriction.
+        assertThat(derivedInfo.getLengthRestrictionString(), is(nullValue()));
+        assertThat(derivedInfo.getRangeRestrictionString(), is(nullValue()));
+        assertThat(derivedInfo.getPatternRestriction(), is(nullValue()));
+        assertThat(derivedInfo.getResolvedExtendedInfo(), is(nullValue()));
+    }
+
+    /**
+     * Checks inter file uses linking.
+     */
+    @Test
+    public void processInterFileUsesLinking()
+            throws IOException, ParserException, MojoExecutionException {
+
+        String searchDir = "src/test/resources/interfileuses";
+        utilManager.createYangFileInfoSet(YangFileScanner.getYangFiles(searchDir));
+        utilManager.parseYangFileInfoSet();
+
+        YangNode refNode = null;
+        YangNode selfNode = null;
+
+        // Create YANG node set
+        yangLinkerManager.createYangNodeSet(utilManager.getYangFileInfoSet());
+
+        // Add references to import list.
+        yangLinkerManager.addRefToYangFilesImportList(utilManager.getYangFileInfoSet());
+
+        // Carry out inter-file linking.
+        yangLinkerManager.processInterFileLinking(utilManager.getYangFileInfoSet());
+
+        Iterator<YangFileInfo> yangFileInfoIterator = utilManager.getYangFileInfoSet().iterator();
+
+        YangFileInfo yangFileInfo = yangFileInfoIterator.next();
+
+        if (yangFileInfo.getRootNode().getName().equals("module1")) {
+            selfNode = yangFileInfo.getRootNode();
+            refNode = yangFileInfoIterator.next().getRootNode();
+        } else {
+            refNode = yangFileInfo.getRootNode();
+            selfNode = yangFileInfoIterator.next().getRootNode();
+        }
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((selfNode instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(selfNode.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) selfNode;
+        assertThat(yangNode.getName(), is("module1"));
+
+        ListIterator<YangLeaf> leafIterator;
+        YangLeaf leafInfo;
+
+        // Check whether grouping is the sibling of module's child.
+        assertThat((refNode.getChild() instanceof YangGrouping), is(true));
+
+        YangGrouping grouping = (YangGrouping) refNode.getChild();
+        leafIterator = grouping.getListOfLeaf().listIterator();
+        leafInfo = leafIterator.next();
+
+        // Check whether the information in the leaf is correct under grouping.
+        assertThat(leafInfo.getName(), is("hello"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("string"));
+        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.STRING));
+
+        // Check whether uses is module's child.
+        assertThat((yangNode.getChild() instanceof YangUses), is(true));
+        YangUses uses = (YangUses) yangNode.getChild();
+
+        // Check whether uses get resolved.
+        assertThat(uses.getResolvableStatus(),
+                is(ResolvableStatus.RESOLVED));
+
+//        leafIterator = yangNode.getListOfLeaf().listIterator();
+//        leafInfo = leafIterator.next();
+//
+//        // Check whether the information in the leaf is correct under module.
+//        assertThat(leafInfo.getName(), is("hello"));
+//        assertThat(leafInfo.getDataType().getDataTypeName(), is("string"));
+//        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.STRING));
+    }
+
+    /**
+     * Checks inter file type linking with include list.
+     */
+    @Test
+    public void processInterFileTypeLinkingWithIncludeList()
+            throws IOException, ParserException, MojoExecutionException {
+
+        String searchDir = "src/test/resources/interfiletypewithinclude";
+        utilManager.createYangFileInfoSet(YangFileScanner.getYangFiles(searchDir));
+        utilManager.parseYangFileInfoSet();
+
+        YangNode refNode = null;
+        YangNode selfNode = null;
+
+        // Create YANG node set
+        yangLinkerManager.createYangNodeSet(utilManager.getYangFileInfoSet());
+
+        // Carry out linking of sub module with module.
+        yangLinkerManager.linkSubModulesToParentModule(utilManager.getYangFileInfoSet());
+
+        // Add reference to include list.
+        yangLinkerManager.addRefToYangFilesIncludeList(utilManager.getYangFileInfoSet());
+
+        // Carry out inter-file linking.
+        yangLinkerManager.processInterFileLinking(utilManager.getYangFileInfoSet());
+
+        Iterator<YangFileInfo> yangFileInfoIterator = utilManager.getYangFileInfoSet().iterator();
+
+        YangFileInfo yangFileInfo = yangFileInfoIterator.next();
+
+        if (yangFileInfo.getRootNode().getName().equals("module1")) {
+            selfNode = yangFileInfo.getRootNode();
+            refNode = yangFileInfoIterator.next().getRootNode();
+        } else {
+            refNode = yangFileInfo.getRootNode();
+            selfNode = yangFileInfoIterator.next().getRootNode();
+        }
+
+        // Check whether the data model tree returned is of type module.
+        assertThat(selfNode instanceof YangModule, is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(selfNode.getNodeType(), is(MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) selfNode;
+        assertThat(yangNode.getName(), is("module1"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("hello"));
+        assertThat(leafInfo.getDataType().getDataType(), is(DERIVED));
+
+        assertThat(((YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo()).getReferredTypeDef(),
+                is((YangTypeDef) refNode.getChild()));
+
+        assertThat(leafInfo.getDataType().getResolvableStatus(), is(RESOLVED));
+
+        YangDerivedInfo<?> derivedInfo = (YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo();
+
+        // Check for the effective built-in type.
+        assertThat(derivedInfo.getEffectiveBuiltInType(), is(STRING));
+
+        // Check for the restriction.
+        assertThat(derivedInfo.getLengthRestrictionString(), is(nullValue()));
+        assertThat(derivedInfo.getRangeRestrictionString(), is(nullValue()));
+        assertThat(derivedInfo.getPatternRestriction(), is(nullValue()));
+        assertThat(derivedInfo.getResolvedExtendedInfo(), is(nullValue()));
+    }
+
+    /**
+     * Checks inter file uses linking with include list.
+     */
+    @Test
+    public void processInterFileUsesLinkingWithInclude()
+            throws IOException, ParserException, MojoExecutionException {
+
+        String searchDir = "src/test/resources/interfileuseswithinclude";
+        utilManager.createYangFileInfoSet(YangFileScanner.getYangFiles(searchDir));
+        utilManager.parseYangFileInfoSet();
+
+        YangNode refNode = null;
+        YangNode selfNode = null;
+
+        // Create YANG node set
+        yangLinkerManager.createYangNodeSet(utilManager.getYangFileInfoSet());
+
+        // Carry out linking of sub module with module.
+        yangLinkerManager.linkSubModulesToParentModule(utilManager.getYangFileInfoSet());
+
+        // Add reference to include list.
+        yangLinkerManager.addRefToYangFilesIncludeList(utilManager.getYangFileInfoSet());
+
+        // Carry out inter-file linking.
+        yangLinkerManager.processInterFileLinking(utilManager.getYangFileInfoSet());
+
+        Iterator<YangFileInfo> yangFileInfoIterator = utilManager.getYangFileInfoSet().iterator();
+
+        YangFileInfo yangFileInfo = yangFileInfoIterator.next();
+
+        if (yangFileInfo.getRootNode().getName().equals("module1")) {
+            selfNode = yangFileInfo.getRootNode();
+            refNode = yangFileInfoIterator.next().getRootNode();
+        } else {
+            refNode = yangFileInfo.getRootNode();
+            selfNode = yangFileInfoIterator.next().getRootNode();
+        }
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((selfNode instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(selfNode.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) selfNode;
+        assertThat(yangNode.getName(), is("module1"));
+
+        ListIterator<YangLeaf> leafIterator;
+        YangLeaf leafInfo;
+
+        // Check whether grouping is the sibling of module's child.
+        assertThat((refNode.getChild() instanceof YangGrouping), is(true));
+
+        YangGrouping grouping = (YangGrouping) refNode.getChild();
+        leafIterator = grouping.getListOfLeaf().listIterator();
+        leafInfo = leafIterator.next();
+
+        // Check whether the information in the leaf is correct under grouping.
+        assertThat(leafInfo.getName(), is("hello"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("string"));
+        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.STRING));
+
+        // Check whether uses is module's child.
+        assertThat((yangNode.getChild() instanceof YangUses), is(true));
+        YangUses uses = (YangUses) yangNode.getChild();
+
+        // Check whether uses get resolved.
+        assertThat(uses.getResolvableStatus(),
+                is(ResolvableStatus.RESOLVED));
+
+//        leafIterator = yangNode.getListOfLeaf().listIterator();
+//        leafInfo = leafIterator.next();
+//
+//        // Check whether the information in the leaf is correct under module.
+//        assertThat(leafInfo.getName(), is("hello"));
+//        assertThat(leafInfo.getDataType().getDataTypeName(), is("string"));
+//        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.STRING));
+    }
+
+    /**
+     * Checks inter file type linking with revision.
+     */
+    @Test
+    public void processInterFileTypeLinkingWithRevision()
+            throws IOException, ParserException, MojoExecutionException {
+
+        String searchDir = "src/test/resources/interfiletypewithrevision";
+        utilManager.createYangFileInfoSet(YangFileScanner.getYangFiles(searchDir));
+        utilManager.parseYangFileInfoSet();
+
+        YangNode refNode = null;
+        YangNode selfNode = null;
+
+        // Create YANG node set
+        yangLinkerManager.createYangNodeSet(utilManager.getYangFileInfoSet());
+
+        // Add references to import list.
+        yangLinkerManager.addRefToYangFilesImportList(utilManager.getYangFileInfoSet());
+
+        // Carry out inter-file linking.
+        yangLinkerManager.processInterFileLinking(utilManager.getYangFileInfoSet());
+
+        Iterator<YangFileInfo> yangFileInfoIterator = utilManager.getYangFileInfoSet().iterator();
+
+        YangFileInfo yangFileInfo = yangFileInfoIterator.next();
+
+        if (yangFileInfo.getRootNode().getName().equals("module1")) {
+            selfNode = yangFileInfo.getRootNode();
+            refNode = yangFileInfoIterator.next().getRootNode();
+        } else {
+            refNode = yangFileInfo.getRootNode();
+            selfNode = yangFileInfoIterator.next().getRootNode();
+        }
+
+        // Check whether the data model tree returned is of type module.
+        assertThat(selfNode instanceof YangModule, is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(selfNode.getNodeType(), is(MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) selfNode;
+        assertThat(yangNode.getName(), is("module1"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("hello"));
+        assertThat(leafInfo.getDataType().getDataType(), is(DERIVED));
+
+        assertThat(((YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo()).getReferredTypeDef(),
+                is((YangTypeDef) refNode.getChild()));
+
+        assertThat(leafInfo.getDataType().getResolvableStatus(), is(RESOLVED));
+
+        YangDerivedInfo<?> derivedInfo = (YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo();
+
+        // Check for the effective built-in type.
+        assertThat(derivedInfo.getEffectiveBuiltInType(), is(STRING));
+
+        // Check for the restriction.
+        assertThat(derivedInfo.getLengthRestrictionString(), is(nullValue()));
+        assertThat(derivedInfo.getRangeRestrictionString(), is(nullValue()));
+        assertThat(derivedInfo.getPatternRestriction(), is(nullValue()));
+        assertThat(derivedInfo.getResolvedExtendedInfo(), is(nullValue()));
+    }
+
+    /**
+     * Checks inter file type linking with revision in name.
+     */
+    @Test
+    public void processInterFileTypeLinkingWithRevisionInName()
+            throws IOException, ParserException, MojoExecutionException {
+
+        String searchDir = "src/test/resources/interfiletypewithrevisioninname";
+        utilManager.createYangFileInfoSet(YangFileScanner.getYangFiles(searchDir));
+        utilManager.parseYangFileInfoSet();
+
+        YangNode refNode = null;
+        YangNode selfNode = null;
+
+        // Create YANG node set
+        yangLinkerManager.createYangNodeSet(utilManager.getYangFileInfoSet());
+
+        // Add references to import list.
+        yangLinkerManager.addRefToYangFilesImportList(utilManager.getYangFileInfoSet());
+
+        // Carry out inter-file linking.
+        yangLinkerManager.processInterFileLinking(utilManager.getYangFileInfoSet());
+
+        Iterator<YangFileInfo> yangFileInfoIterator = utilManager.getYangFileInfoSet().iterator();
+
+        YangFileInfo yangFileInfo = yangFileInfoIterator.next();
+
+        if (yangFileInfo.getRootNode().getName().equals("module1")) {
+            selfNode = yangFileInfo.getRootNode();
+            refNode = yangFileInfoIterator.next().getRootNode();
+        } else {
+            refNode = yangFileInfo.getRootNode();
+            selfNode = yangFileInfoIterator.next().getRootNode();
+        }
+
+        // Check whether the data model tree returned is of type module.
+        assertThat(selfNode instanceof YangModule, is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(selfNode.getNodeType(), is(MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) selfNode;
+        assertThat(yangNode.getName(), is("module1"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("hello"));
+        assertThat(leafInfo.getDataType().getDataType(), is(DERIVED));
+
+        assertThat(((YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo()).getReferredTypeDef(),
+                is((YangTypeDef) refNode.getChild()));
+
+        assertThat(leafInfo.getDataType().getResolvableStatus(), is(RESOLVED));
+
+        YangDerivedInfo<?> derivedInfo = (YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo();
+
+        // Check for the effective built-in type.
+        assertThat(derivedInfo.getEffectiveBuiltInType(), is(STRING));
+
+        // Check for the restriction.
+        assertThat(derivedInfo.getLengthRestrictionString(), is(nullValue()));
+        assertThat(derivedInfo.getRangeRestrictionString(), is(nullValue()));
+        assertThat(derivedInfo.getPatternRestriction(), is(nullValue()));
+        assertThat(derivedInfo.getResolvedExtendedInfo(), is(nullValue()));
+    }
+
+    /**
+     * Checks hierarchical inter file type linking.
+     */
+    @Test
+    public void processHierarchicalInterFileTypeLinking()
+            throws IOException, ParserException, MojoExecutionException {
+
+        String searchDir = "src/test/resources/hierarchicalinterfiletype";
+        utilManager.createYangFileInfoSet(YangFileScanner.getYangFiles(searchDir));
+        utilManager.parseYangFileInfoSet();
+
+        YangNode refNode1 = null;
+        YangNode refNode2 = null;
+        YangNode selfNode = null;
+
+        // Create YANG node set
+        yangLinkerManager.createYangNodeSet(utilManager.getYangFileInfoSet());
+
+        // Add references to import list.
+        yangLinkerManager.addRefToYangFilesImportList(utilManager.getYangFileInfoSet());
+
+        // Carry out inter-file linking.
+        yangLinkerManager.processInterFileLinking(utilManager.getYangFileInfoSet());
+
+        for (YangFileInfo yangFile : utilManager.getYangFileInfoSet()) {
+            if (yangFile.getRootNode().getName().equals("ietf-network-topology")) {
+                selfNode = yangFile.getRootNode();
+            } else if (yangFile.getRootNode().getName().equals("ietf-network")) {
+                refNode1 = yangFile.getRootNode();
+            } else {
+                refNode2 = yangFile.getRootNode();
+            }
+        }
+
+        // Check whether the data model tree returned is of type module.
+        assertThat(selfNode instanceof YangModule, is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(selfNode.getNodeType(), is(MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) selfNode;
+        assertThat(yangNode.getName(), is("ietf-network-topology"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("source-node"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("node-id"));
+        assertThat(leafInfo.getDataType().getDataType(), is(DERIVED));
+
+        assertThat(((YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo()).getReferredTypeDef(),
+                is((YangTypeDef) refNode1.getChild()));
+
+        assertThat(leafInfo.getDataType().getResolvableStatus(), is(RESOLVED));
+
+        YangDerivedInfo<?> derivedInfo = (YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo();
+
+        // Check for the effective built-in type.
+        assertThat(derivedInfo.getEffectiveBuiltInType(), is(STRING));
+
+        // Check for the restriction.
+        assertThat(derivedInfo.getLengthRestrictionString(), is(nullValue()));
+        assertThat(derivedInfo.getRangeRestrictionString(), is(nullValue()));
+        assertThat(derivedInfo.getPatternRestriction(), is(nullValue()));
+        assertThat(derivedInfo.getResolvedExtendedInfo(), is(nullValue()));
+    }
+
+    /**
+     * Checks hierarchical intra with inter file type linking.
+     */
+    @Test
+    public void processHierarchicalIntraWithInterFileTypeLinking()
+            throws IOException, ParserException, MojoExecutionException {
+
+        String searchDir = "src/test/resources/hierarchicalintrawithinterfiletype";
+        utilManager.createYangFileInfoSet(YangFileScanner.getYangFiles(searchDir));
+        utilManager.parseYangFileInfoSet();
+
+        YangNode refNode1 = null;
+        YangNode selfNode = null;
+
+        // Create YANG node set
+        yangLinkerManager.createYangNodeSet(utilManager.getYangFileInfoSet());
+
+        // Add references to import list.
+        yangLinkerManager.addRefToYangFilesImportList(utilManager.getYangFileInfoSet());
+
+        // Carry out inter-file linking.
+        yangLinkerManager.processInterFileLinking(utilManager.getYangFileInfoSet());
+
+        for (YangFileInfo yangFile : utilManager.getYangFileInfoSet()) {
+            if (yangFile.getRootNode().getName().equals("ietf-network")) {
+                selfNode = yangFile.getRootNode();
+            } else if (yangFile.getRootNode().getName().equals("ietf-inet-types")) {
+                refNode1 = yangFile.getRootNode();
+            }
+        }
+
+        // Check whether the data model tree returned is of type module.
+        assertThat(selfNode instanceof YangModule, is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(selfNode.getNodeType(), is(MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) selfNode;
+        assertThat(yangNode.getName(), is("ietf-network"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("node-ref"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("node-id"));
+        assertThat(leafInfo.getDataType().getDataType(), is(DERIVED));
+
+        assertThat(((YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo()).getReferredTypeDef(),
+                is((YangTypeDef) selfNode.getChild()));
+
+        assertThat(leafInfo.getDataType().getResolvableStatus(), is(RESOLVED));
+
+        YangDerivedInfo<?> derivedInfo = (YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo();
+
+        // Check for the effective built-in type.
+        assertThat(derivedInfo.getEffectiveBuiltInType(), is(STRING));
+
+        // Check for the restriction.
+        assertThat(derivedInfo.getLengthRestrictionString(), is(nullValue()));
+        assertThat(derivedInfo.getRangeRestrictionString(), is(nullValue()));
+        assertThat(derivedInfo.getPatternRestriction(), is(nullValue()));
+        assertThat(derivedInfo.getResolvedExtendedInfo(), is(nullValue()));
+    }
+
+    /**
+     * Checks hierarchical intra with inter file type linking.
+     */
+    @Test
+    public void interFileWithUsesReferringType()
+            throws IOException, ParserException, MojoExecutionException {
+
+        String searchDir = "src/test/resources/interfilewithusesreferringtype";
+        utilManager.createYangFileInfoSet(YangFileScanner.getYangFiles(searchDir));
+        utilManager.parseYangFileInfoSet();
+        utilManager.resolveDependenciesUsingLinker();
+
+        String userDir = System.getProperty("user.dir");
+        YangPluginConfig yangPluginConfig = new YangPluginConfig();
+        yangPluginConfig.setCodeGenDir("target/interfilewithusesreferringtype/");
+
+        utilManager.translateToJava(utilManager.getYangFileInfoSet(), yangPluginConfig);
+
+        deleteDirectory(userDir + "/target/interfilewithusesreferringtype/");
+
+    }
+
+    /**
+     * Checks hierarchical intra with inter file type linking.
+     */
+    @Test
+    public void file1UsesFile2TypeDefFile3Type()
+            throws IOException, ParserException, MojoExecutionException {
+
+        String searchDir = "src/test/resources/file1UsesFile2TypeDefFile3Type";
+        utilManager.createYangFileInfoSet(YangFileScanner.getYangFiles(searchDir));
+        utilManager.parseYangFileInfoSet();
+        utilManager.resolveDependenciesUsingLinker();
+
+        String userDir = System.getProperty("user.dir");
+        YangPluginConfig yangPluginConfig = new YangPluginConfig();
+        yangPluginConfig.setCodeGenDir("target/file1UsesFile2TypeDefFile3Type/");
+
+        utilManager.translateToJava(utilManager.getYangFileInfoSet(), yangPluginConfig);
+
+        deleteDirectory(userDir + "/target/file1UsesFile2TypeDefFile3Type/");
+
+    }
+
+
+    /**
+     * Checks hierarchical intra with inter file type linking.
+     */
+    @Test
+    public void interFileIetf()
+            throws IOException, ParserException, MojoExecutionException {
+
+        String searchDir = "src/test/resources/interfileietf";
+        utilManager.createYangFileInfoSet(YangFileScanner.getYangFiles(searchDir));
+        utilManager.parseYangFileInfoSet();
+        utilManager.resolveDependenciesUsingLinker();
+
+        String userDir = System.getProperty("user.dir");
+        YangPluginConfig yangPluginConfig = new YangPluginConfig();
+        yangPluginConfig.setCodeGenDir("target/interfileietf/");
+
+        utilManager.translateToJava(utilManager.getYangFileInfoSet(), yangPluginConfig);
+
+        deleteDirectory(userDir + "/target/interfileietf/");
+
+    }
+
+
+    /**
+     * Checks hierarchical intra with inter file type linking.
+     */
+    @Test
+    public void usesInContainer()
+            throws IOException, ParserException, MojoExecutionException {
+
+        String searchDir = "src/test/resources/usesInContainer";
+        utilManager.createYangFileInfoSet(YangFileScanner.getYangFiles(searchDir));
+        utilManager.parseYangFileInfoSet();
+        utilManager.resolveDependenciesUsingLinker();
+
+        String userDir = System.getProperty("user.dir");
+        YangPluginConfig yangPluginConfig = new YangPluginConfig();
+        yangPluginConfig.setCodeGenDir("target/usesInContainer/");
+
+        utilManager.translateToJava(utilManager.getYangFileInfoSet(), yangPluginConfig);
+
+        deleteDirectory(userDir + "/target/usesInContainer/");
+
+    }
+
+
+    /**
+     * Checks hierarchical intra with inter file type linking.
+     */
+    @Test
+    public void groupingNodeSameAsModule()
+            throws IOException, ParserException, MojoExecutionException {
+
+        String searchDir = "src/test/resources/groupingNodeSameAsModule";
+        utilManager.createYangFileInfoSet(YangFileScanner.getYangFiles(searchDir));
+        utilManager.parseYangFileInfoSet();
+        utilManager.resolveDependenciesUsingLinker();
+
+        String userDir = System.getProperty("user.dir");
+        YangPluginConfig yangPluginConfig = new YangPluginConfig();
+        yangPluginConfig.setCodeGenDir("target/groupingNodeSameAsModule/");
+
+        utilManager.translateToJava(utilManager.getYangFileInfoSet(), yangPluginConfig);
+
+        deleteDirectory(userDir + "/target/groupingNodeSameAsModule/");
+
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/linker/InterJarLinkingTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/linker/InterJarLinkingTest.java
new file mode 100644
index 0000000..39b03fe
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/linker/InterJarLinkingTest.java
@@ -0,0 +1,217 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.linker;
+
+import java.io.File;
+import java.io.IOException;
+import java.util.ArrayList;
+import java.util.Iterator;
+import java.util.List;
+import java.util.ListIterator;
+
+import org.apache.maven.plugin.MojoExecutionException;
+import org.junit.Test;
+import org.onosproject.yangutils.datamodel.YangContainer;
+import org.onosproject.yangutils.datamodel.YangDerivedInfo;
+import org.onosproject.yangutils.datamodel.YangGrouping;
+import org.onosproject.yangutils.datamodel.YangLeaf;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.plugin.manager.YangFileInfo;
+import org.onosproject.yangutils.plugin.manager.YangUtilManager;
+import org.onosproject.yangutils.utils.io.impl.YangFileScanner;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.core.Is.is;
+import static org.onosproject.yangutils.datamodel.YangDataTypes.DERIVED;
+import static org.onosproject.yangutils.datamodel.YangDataTypes.STRING;
+import static org.onosproject.yangutils.datamodel.utils.ResolvableStatus.RESOLVED;
+import static org.onosproject.yangutils.utils.io.impl.YangIoUtils.deSerializeDataModel;
+import static org.onosproject.yangutils.utils.io.impl.YangIoUtils.deleteDirectory;
+import static org.onosproject.yangutils.utils.io.impl.YangIoUtils.parseJarFile;
+
+/**
+ * Unit test case for inter-jar linker.
+ */
+public class InterJarLinkingTest {
+
+    private final YangUtilManager utilManager = new YangUtilManager();
+
+    private static final String TARGET = "target/interJarFileLinking";
+    private static final String SEARCH_DIR_FOR_YANG_FILES = "src/test/resources/interJarFileLinking/yangFiles";
+    private static final String SEARCH_DIR_FOR_SINGLE_JAR_FILES = "src/test/resources/interJarFileLinking/"
+            + "jarFiles/single";
+    private static final String SEARCH_DIR_FOR_MULTI_JAR_FILES = "src/test/resources/interJarFileLinking/"
+            + "jarFiles/multi";
+
+    /**
+     * Unit test case for a single jar dependency.
+     *
+     * @throws IOException when fails to do IO operations
+     * @throws MojoExecutionException when fails to do mojo operations
+     */
+    @Test
+    public void processSingleJarLinking()
+            throws IOException, MojoExecutionException {
+        utilManager.createYangFileInfoSet(YangFileScanner.getYangFiles(SEARCH_DIR_FOR_YANG_FILES));
+
+        int size1 = utilManager.getYangFileInfoSet().size();
+
+        for (String file : getListOfTestJar(SEARCH_DIR_FOR_SINGLE_JAR_FILES)) {
+            addInterJarRootNodes(file);
+        }
+
+        utilManager.parseYangFileInfoSet();
+
+        utilManager.resolveDependenciesUsingLinker();
+
+        Iterator<YangFileInfo> yangFileInfoIterator = utilManager.getYangFileInfoSet().iterator();
+
+        YangFileInfo yangFileInfo = yangFileInfoIterator.next();
+
+        int size2 = utilManager.getYangFileInfoSet().size();
+        assertThat(true, is(size1 != size2));
+        assertThat(true, is(yangFileInfo.getRootNode().getName().equals("port-pair")));
+
+        deleteDirectory(TARGET);
+
+    }
+
+    /**
+     * Unit test case for a multiple jar dependency.
+     *
+     * @throws IOException when fails to do IO operations
+     * @throws MojoExecutionException when fails to do mojo operations
+     */
+    @Test
+    public void processMultipleJarLinking()
+            throws IOException, MojoExecutionException {
+        utilManager.createYangFileInfoSet(YangFileScanner.getYangFiles(SEARCH_DIR_FOR_YANG_FILES));
+
+        int size1 = utilManager.getYangFileInfoSet().size();
+
+        for (String file : getListOfTestJar(SEARCH_DIR_FOR_MULTI_JAR_FILES)) {
+            addInterJarRootNodes(file);
+        }
+
+        utilManager.parseYangFileInfoSet();
+
+        utilManager.resolveDependenciesUsingLinker();
+
+        Iterator<YangFileInfo> yangFileInfoIterator = utilManager.getYangFileInfoSet().iterator();
+
+        YangFileInfo yangFileInfo = yangFileInfoIterator.next();
+
+        int size2 = utilManager.getYangFileInfoSet().size();
+        assertThat(true, is(size1 != size2));
+        assertThat(true, is(yangFileInfo.getRootNode().getName().equals("port-pair")));
+
+        yangFileInfo = yangFileInfoIterator.next();
+        assertThat(true, is(yangFileInfo.getRootNode().getName().equals("flow-classifier")));
+
+        /*
+         * grouping flow-classifier {
+         *      container flow-classifier {
+         *           leaf id {
+         *                type flow-classifier-id;
+         *           }
+         *
+         *           leaf tenant-id {
+         *                type port-pair:tenant-id;
+         *           }
+         *           .
+         *           .
+         *           .
+         *
+         */
+
+        YangNode node = yangFileInfo.getRootNode();
+        node = node.getChild();
+        while (node != null) {
+            if (node instanceof YangGrouping) {
+                break;
+            }
+            node = node.getNextSibling();
+        }
+
+        node = node.getChild();
+        ListIterator<YangLeaf> leafIterator = ((YangContainer) node).getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("id"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("flow-classifier-id"));
+        assertThat(leafInfo.getDataType().getDataType(), is(DERIVED));
+
+        leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("tenant-id"));
+        assertThat(leafInfo.getDataType().getDataType(), is(DERIVED));
+
+        assertThat(true, is(((YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo()).getReferredTypeDef()
+                .getName().equals("tenant-id")));
+
+        assertThat(leafInfo.getDataType().getResolvableStatus(), is(RESOLVED));
+
+        YangDerivedInfo<?> derivedInfo = (YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo();
+
+        // Check for the effective built-in type.
+        assertThat(derivedInfo.getEffectiveBuiltInType(), is(STRING));
+
+        deleteDirectory(TARGET);
+    }
+
+    /**
+     * Returns list of test jar files.
+     *
+     * @param searchdir search directory
+     * @return list of test jar files
+     */
+    private List<String> getListOfTestJar(String searchdir) {
+        List<String> jarFiles = new ArrayList<>();
+
+        File directory = new File(searchdir + "/");
+        File[] files = directory.listFiles();
+
+        for (File file : files) {
+            jarFiles.add(file.toString());
+        }
+
+        return jarFiles;
+    }
+
+    /**
+     * Adds data model nodes of jar to file info set.
+     *
+     * @param jarFile jar file name
+     * @throws IOException when fails to do IO operations
+     */
+    private void addInterJarRootNodes(String jarFile) throws IOException {
+        try {
+            List<YangNode> interJarResolvedNodes = deSerializeDataModel(parseJarFile(jarFile, TARGET));
+
+            for (YangNode node : interJarResolvedNodes) {
+                YangFileInfo dependentFileInfo = new YangFileInfo();
+                dependentFileInfo.setRootNode(node);
+                dependentFileInfo.setForTranslator(false);
+                dependentFileInfo.setYangFileName(node.getName());
+                utilManager.getYangFileInfoSet().add(dependentFileInfo);
+            }
+        } catch (IOException e) {
+            throw new IOException("failed to resolve in interjar scenario.");
+        }
+    }
+
+}
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/linker/IntraFileTypeLinkingTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/linker/IntraFileTypeLinkingTest.java
new file mode 100644
index 0000000..9fba40e
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/linker/IntraFileTypeLinkingTest.java
@@ -0,0 +1,565 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.linker;
+
+import java.io.IOException;
+import java.util.ListIterator;
+import org.junit.Test;
+import org.onosproject.yangutils.datamodel.YangContainer;
+import org.onosproject.yangutils.datamodel.YangDerivedInfo;
+import org.onosproject.yangutils.datamodel.YangLeaf;
+import org.onosproject.yangutils.datamodel.YangList;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangTypeDef;
+import org.onosproject.yangutils.linker.exceptions.LinkerException;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
+
+import static org.hamcrest.CoreMatchers.nullValue;
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.core.Is.is;
+import static org.onosproject.yangutils.datamodel.YangDataTypes.BINARY;
+import static org.onosproject.yangutils.datamodel.YangDataTypes.DERIVED;
+import static org.onosproject.yangutils.datamodel.YangDataTypes.INT32;
+import static org.onosproject.yangutils.datamodel.YangDataTypes.STRING;
+import static org.onosproject.yangutils.datamodel.YangNodeType.MODULE_NODE;
+import static org.onosproject.yangutils.datamodel.utils.ResolvableStatus.INTRA_FILE_RESOLVED;
+import static org.onosproject.yangutils.datamodel.utils.ResolvableStatus.RESOLVED;
+
+/**
+ * Test cases for testing "type" intra file linking.
+ */
+public class IntraFileTypeLinkingTest {
+
+    private final YangUtilsParserManager manager = new YangUtilsParserManager();
+
+    /**
+     * Checks self resolution when typedef and leaf using type are siblings.
+     */
+    @Test
+    public void processSelfResolutionWhenTypeAndTypedefAtRootLevel()
+            throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/SelfResolutionWhenTypeAndTypedefAtRootLevel.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat(node instanceof YangModule, is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("hello"));
+        assertThat(leafInfo.getDataType().getDataType(), is(DERIVED));
+
+        assertThat(((YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo()).getReferredTypeDef(),
+                is((YangTypeDef) node.getChild()));
+
+        assertThat(leafInfo.getDataType().getResolvableStatus(), is(RESOLVED));
+
+        YangDerivedInfo<?> derivedInfo = (YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo();
+
+        // Check for the effective built-in type.
+        assertThat(derivedInfo.getEffectiveBuiltInType(), is(STRING));
+
+        // Check for the restriction.
+        assertThat(derivedInfo.getLengthRestrictionString(), is(nullValue()));
+        assertThat(derivedInfo.getRangeRestrictionString(), is(nullValue()));
+        assertThat(derivedInfo.getPatternRestriction(), is(nullValue()));
+        assertThat(derivedInfo.getResolvedExtendedInfo(), is(nullValue()));
+    }
+
+    /**
+     * Checks self resolution when typedef and leaf using type are at different
+     * level where typedef is at the root.
+     */
+    @Test
+    public void processSelfFileLinkingTypedefAtRootTypeTwoLevelInHierarchy()
+            throws IOException, ParserException {
+
+        YangNode node =
+                manager.getDataModel("src/test/resources/SelfFileLinkingTypedefAtRootTypeTwoLevelInHierarchy.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        YangContainer yangContainer = (YangContainer) node.getChild().getNextSibling();
+
+        YangList yangList = (YangList) yangContainer.getChild();
+
+        ListIterator<YangLeaf> leafIterator = yangList.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("hello"));
+        assertThat(leafInfo.getDataType().getDataType(), is(DERIVED));
+
+        assertThat(((YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo()).getReferredTypeDef(),
+                is((YangTypeDef) node.getChild()));
+
+        assertThat(leafInfo.getDataType().getResolvableStatus(), is(RESOLVED));
+
+        YangDerivedInfo<?> derivedInfo = (YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo();
+
+        // Check for the effective built-in type.
+        assertThat(derivedInfo.getEffectiveBuiltInType(), is(STRING));
+
+        // Check for the restriction.
+        assertThat(derivedInfo.getLengthRestrictionString(), is(nullValue()));
+        assertThat(derivedInfo.getRangeRestrictionString(), is(nullValue()));
+        assertThat(derivedInfo.getPatternRestriction(), is(nullValue()));
+        assertThat(derivedInfo.getResolvedExtendedInfo(), is(nullValue()));
+    }
+
+    /**
+     * Checks self resolution when typedef and leaf using type are at different
+     * level where typedef is at the root and defined after parent holder
+     * of type.
+     */
+    @Test
+    public void processSelfFileLinkingTypedefAtRootIsAfterContainerHavingType()
+            throws IOException, ParserException {
+
+        YangNode node =
+                manager.getDataModel("src/test/resources/SelfFileLinkingTypedefAtRootIsAfterContainerHavingType.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        YangContainer yangContainer = (YangContainer) node.getChild();
+
+        YangList yangList = (YangList) yangContainer.getChild();
+
+        ListIterator<YangLeaf> leafIterator = yangList.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("hello"));
+        assertThat(leafInfo.getDataType().getDataType(), is(DERIVED));
+
+        assertThat(((YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo()).getReferredTypeDef(),
+                is((YangTypeDef) node.getChild().getNextSibling()));
+
+        assertThat(leafInfo.getDataType().getResolvableStatus(), is(RESOLVED));
+
+        YangDerivedInfo<?> derivedInfo = (YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo();
+
+        // Check for the effective built-in type.
+        assertThat(derivedInfo.getEffectiveBuiltInType(), is(STRING));
+
+        // Check for the restriction.
+        assertThat(derivedInfo.getLengthRestrictionString(), is(nullValue()));
+        assertThat(derivedInfo.getRangeRestrictionString(), is(nullValue()));
+        assertThat(derivedInfo.getPatternRestriction(), is(nullValue()));
+        assertThat(derivedInfo.getResolvedExtendedInfo(), is(nullValue()));
+    }
+
+    /**
+     * Checks self resolution when typedef and leaf using type are at different
+     * level where typedef is at the level of root+1 and defined after parent
+     * holder of type.
+     */
+    @Test
+    public void processSelfFileLinkingTypedefAtMiddleLevelAfterParentHolder()
+            throws IOException, ParserException {
+
+        YangNode node =
+                manager.getDataModel("src/test/resources/SelfFileLinkingTypedefAtMiddleLevelAfterParentHolder.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        YangContainer yangContainer = (YangContainer) node.getChild();
+
+        YangList yangList = (YangList) yangContainer.getChild();
+
+        ListIterator<YangLeaf> leafIterator = yangList.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("hello"));
+        assertThat(leafInfo.getDataType().getDataType(), is(DERIVED));
+
+        assertThat(((YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo()).getReferredTypeDef(),
+                is((YangTypeDef) yangContainer.getChild().getNextSibling()));
+
+        assertThat(leafInfo.getDataType().getResolvableStatus(), is(RESOLVED));
+
+        YangDerivedInfo<?> derivedInfo = (YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo();
+
+        // Check for the effective built-in type.
+        assertThat(derivedInfo.getEffectiveBuiltInType(), is(STRING));
+
+        // Check for the restriction.
+        assertThat(derivedInfo.getLengthRestrictionString(), is(nullValue()));
+        assertThat(derivedInfo.getRangeRestrictionString(), is(nullValue()));
+        assertThat(derivedInfo.getPatternRestriction(), is(nullValue()));
+        assertThat(derivedInfo.getResolvedExtendedInfo(), is(nullValue()));
+    }
+
+    /**
+     * Checks self resolution when typedef hierarchical references are present.
+     */
+    @Test
+    public void processSelfFileLinkingWithTypdefHierarchicalReference()
+            throws IOException, ParserException {
+
+        YangNode node =
+                manager.getDataModel("src/test/resources/SelfFileLinkingWithTypdefHierarchicalReference.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        YangContainer yangContainer = (YangContainer) node.getChild().getNextSibling();
+
+        YangList yangList = (YangList) yangContainer.getChild();
+
+        ListIterator<YangLeaf> leafIterator = yangList.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("FirstClass"));
+        assertThat(leafInfo.getDataType().getDataType(), is(DERIVED));
+
+        assertThat(((YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo()).getReferredTypeDef(),
+                is((YangTypeDef) yangList.getChild()));
+        assertThat(leafInfo.getDataType().getResolvableStatus(),
+                is(RESOLVED));
+
+        YangTypeDef typeDef1 = (YangTypeDef) yangList.getChild();
+
+        assertThat(((YangDerivedInfo<?>) typeDef1.getTypeDefBaseType().getDataTypeExtendedInfo()).getReferredTypeDef(),
+                is((YangTypeDef) yangContainer.getChild().getNextSibling()));
+        assertThat(typeDef1.getTypeDefBaseType().getResolvableStatus(),
+                is(RESOLVED));
+
+        YangTypeDef typeDef2 = (YangTypeDef) yangContainer.getChild().getNextSibling();
+
+        assertThat(((YangDerivedInfo<?>) typeDef2.getTypeDefBaseType().getDataTypeExtendedInfo()).getReferredTypeDef(),
+                is((YangTypeDef) node.getChild()));
+        assertThat(typeDef2.getTypeDefBaseType().getResolvableStatus(),
+                is(RESOLVED));
+
+        YangDerivedInfo<?> derivedInfo = (YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo();
+
+        // Check for the effective built-in type.
+        assertThat(derivedInfo.getEffectiveBuiltInType(), is(INT32));
+
+        // Check for the restriction.
+        assertThat(derivedInfo.getLengthRestrictionString(), is(nullValue()));
+        assertThat(derivedInfo.getRangeRestrictionString(), is(nullValue()));
+        assertThat(derivedInfo.getPatternRestriction(), is(nullValue()));
+        assertThat(derivedInfo.getResolvedExtendedInfo(), is(nullValue()));
+    }
+
+    /**
+     * Checks self resolution when typedef hierarchical references are present
+     * with last type is unresolved.
+     */
+    @Test
+    public void processSelfFileLinkingWithTypdefHierarchicalRefUnresolved()
+            throws IOException, ParserException {
+
+        YangNode node =
+                manager.getDataModel("src/test/resources/SelfFileLinkingWithTypdefHierarchicalRefUnresolved.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        YangContainer yangContainer = (YangContainer) node.getChild().getNextSibling();
+
+        YangList yangList = (YangList) yangContainer.getChild();
+
+        ListIterator<YangLeaf> leafIterator = yangList.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("FirstClass"));
+        assertThat(leafInfo.getDataType().getDataType(), is(DERIVED));
+
+        assertThat(((YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo()).getReferredTypeDef(),
+                is((YangTypeDef) yangList.getChild()));
+        assertThat(leafInfo.getDataType().getResolvableStatus(),
+                is(INTRA_FILE_RESOLVED));
+
+        YangTypeDef typeDef1 = (YangTypeDef) yangList.getChild();
+
+        assertThat(((YangDerivedInfo<?>) typeDef1.getTypeDefBaseType().getDataTypeExtendedInfo()).getReferredTypeDef(),
+                is((YangTypeDef) yangContainer.getChild().getNextSibling()));
+        assertThat(typeDef1.getTypeDefBaseType().getResolvableStatus(),
+                is(INTRA_FILE_RESOLVED));
+
+        YangTypeDef typeDef2 = (YangTypeDef) yangContainer.getChild().getNextSibling();
+
+        assertThat(((YangDerivedInfo<?>) typeDef2.getTypeDefBaseType().getDataTypeExtendedInfo()).getReferredTypeDef(),
+                is((YangTypeDef) node.getChild()));
+        assertThat(typeDef2.getTypeDefBaseType().getResolvableStatus(),
+                is(INTRA_FILE_RESOLVED));
+
+        YangDerivedInfo<?> derivedInfo = (YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo();
+
+        // Check for the effective built-in type.
+        assertThat(derivedInfo.getEffectiveBuiltInType(), is(nullValue()));
+
+        // Check for the restriction.
+        assertThat(derivedInfo.getLengthRestrictionString(), is(nullValue()));
+        assertThat(derivedInfo.getRangeRestrictionString(), is(nullValue()));
+        assertThat(derivedInfo.getPatternRestriction(), is(nullValue()));
+        assertThat(derivedInfo.getResolvedExtendedInfo(), is(nullValue()));
+    }
+
+    /**
+     * Checks self resolution when type uses prefix of self module.
+     */
+    @Test
+    public void processSelfFileLinkingWithTypeWithSelfModulePrefix()
+            throws IOException, ParserException {
+
+        YangNode node =
+                manager.getDataModel("src/test/resources/SelfFileLinkingWithTypeWithSelfModulePrefix.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        YangContainer yangContainer = (YangContainer) node.getChild().getNextSibling();
+
+        YangList yangList = (YangList) yangContainer.getChild();
+
+        ListIterator<YangLeaf> leafIterator = yangList.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("FirstClass"));
+        assertThat(leafInfo.getDataType().getDataType(), is(DERIVED));
+
+        assertThat(((YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo()).getReferredTypeDef(),
+                is((YangTypeDef) yangList.getChild()));
+        assertThat(leafInfo.getDataType().getResolvableStatus(),
+                is(RESOLVED));
+
+        YangTypeDef typeDef1 = (YangTypeDef) yangList.getChild();
+
+        assertThat(((YangDerivedInfo<?>) typeDef1.getTypeDefBaseType().getDataTypeExtendedInfo()).getReferredTypeDef(),
+                is((YangTypeDef) yangContainer.getChild().getNextSibling()));
+        assertThat(typeDef1.getTypeDefBaseType().getResolvableStatus(),
+                is(RESOLVED));
+
+        YangTypeDef typeDef2 = (YangTypeDef) yangContainer.getChild().getNextSibling();
+
+        assertThat(((YangDerivedInfo<?>) typeDef2.getTypeDefBaseType().getDataTypeExtendedInfo()).getReferredTypeDef(),
+                is((YangTypeDef) node.getChild()));
+        assertThat(typeDef2.getTypeDefBaseType().getResolvableStatus(),
+                is(RESOLVED));
+
+        YangDerivedInfo<?> derivedInfo = (YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo();
+
+        // Check for the effective built-in type.
+        assertThat(derivedInfo.getEffectiveBuiltInType(), is(INT32));
+
+        // Check for the restriction.
+        assertThat(derivedInfo.getLengthRestrictionString(), is(nullValue()));
+        assertThat(derivedInfo.getRangeRestrictionString(), is(nullValue()));
+        assertThat(derivedInfo.getPatternRestriction(), is(nullValue()));
+        assertThat(derivedInfo.getResolvedExtendedInfo(), is(nullValue()));
+    }
+
+    /**
+     * Checks self resolution when some type uses prefix of self module
+     * some uses external prefix.
+     */
+    @Test
+    public void processSelfFileLinkingWithTypeWithSelfAndExternalPrefixMix()
+            throws IOException, ParserException {
+
+        YangNode node =
+                manager.getDataModel("src/test/resources/SelfFileLinkingWithTypeWithSelfAndExternalPrefixMix.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        YangContainer yangContainer = (YangContainer) node.getChild().getNextSibling();
+
+        YangList yangList = (YangList) yangContainer.getChild();
+
+        ListIterator<YangLeaf> leafIterator = yangList.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("FirstClass"));
+        assertThat(leafInfo.getDataType().getDataType(), is(DERIVED));
+
+        assertThat(((YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo()).getReferredTypeDef(),
+                is((YangTypeDef) yangList.getChild()));
+        assertThat(leafInfo.getDataType().getResolvableStatus(),
+                is(INTRA_FILE_RESOLVED));
+
+        YangTypeDef typeDef1 = (YangTypeDef) yangList.getChild();
+
+        YangTypeDef typeDef2 = (YangTypeDef) yangContainer.getChild().getNextSibling();
+
+        assertThat(((YangDerivedInfo<?>) typeDef2.getTypeDefBaseType().getDataTypeExtendedInfo()).getReferredTypeDef(),
+                is((YangTypeDef) node.getChild()));
+        assertThat(typeDef2.getTypeDefBaseType().getResolvableStatus(),
+                is(RESOLVED));
+
+        YangDerivedInfo<?> derivedInfo = (YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo();
+
+        // Check for the effective built-in type.
+        assertThat(derivedInfo.getEffectiveBuiltInType(), is(nullValue()));
+
+        // Check for the restriction.
+        assertThat(derivedInfo.getLengthRestrictionString(), is(nullValue()));
+        assertThat(derivedInfo.getRangeRestrictionString(), is(nullValue()));
+        assertThat(derivedInfo.getPatternRestriction(), is(nullValue()));
+        assertThat(derivedInfo.getResolvedExtendedInfo(), is(nullValue()));
+    }
+
+    /**
+     * Check self resolution when type referred typedef is not available in
+     * file.
+     */
+    @Test(expected = LinkerException.class)
+    public void processSelfResolutionWhenTypeReferredTypedefNotDefined()
+            throws IOException, LinkerException {
+
+        YangNode node =
+                manager.getDataModel("src/test/resources/SelfResolutionWhenTypeReferredTypedefNotDefined.yang");
+    }
+
+    /**
+     * Checks self resolution when typedef and leaf using type are at different
+     * level where typedef is is not an ancestor of type.
+     */
+    @Test(expected = LinkerException.class)
+    public void processSelfFileLinkingTypedefNotFound()
+            throws IOException, LinkerException {
+
+        YangNode node = manager.getDataModel("src/test/resources/SelfFileLinkingTypedefNotFound.yang");
+    }
+
+    /**
+     * Checks hierarchical self resolution with self resolution failure scenario.
+     */
+    @Test(expected = LinkerException.class)
+    public void processSelfFileLinkingWithHierarchicalTypeFailureScenario()
+            throws IOException, LinkerException {
+
+        YangNode node =
+                manager.getDataModel("src/test/resources/SelfFileLinkingWithHierarchicalTypeFailureScenario.yang");
+    }
+
+    /**
+     * Checks self resolution when typedef and leaf using type are siblings for binary type.
+     */
+    @Test
+    public void processSelfResolutionWhenTypeAndTypedefAtRootLevelForBinary()
+            throws IOException, ParserException {
+
+        YangNode node
+                = manager.getDataModel("src/test/resources/SelfResolutionWhenTypeAndTypedefAtRootLevelForBinary.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat(node instanceof YangModule, is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("ospf"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("typedef14"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("type14"));
+        assertThat(leafInfo.getDataType().getDataType(), is(DERIVED));
+
+        assertThat(((YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo()).getReferredTypeDef(),
+                is((YangTypeDef) node.getChild()));
+
+        assertThat(leafInfo.getDataType().getResolvableStatus(), is(RESOLVED));
+
+        YangDerivedInfo<?> derivedInfo = (YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo();
+
+        // Check for the effective built-in type.
+        assertThat(derivedInfo.getEffectiveBuiltInType(), is(BINARY));
+
+        // Check for the restriction.
+        assertThat(derivedInfo.getLengthRestrictionString(), is(nullValue()));
+        assertThat(derivedInfo.getRangeRestrictionString(), is(nullValue()));
+        assertThat(derivedInfo.getPatternRestriction(), is(nullValue()));
+        assertThat(derivedInfo.getResolvedExtendedInfo(), is(nullValue()));
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/linker/IntraFileUsesLinkingTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/linker/IntraFileUsesLinkingTest.java
new file mode 100644
index 0000000..e960d62
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/linker/IntraFileUsesLinkingTest.java
@@ -0,0 +1,756 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.linker;
+
+import java.io.IOException;
+import java.util.ListIterator;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+import org.onosproject.yangutils.datamodel.YangContainer;
+import org.onosproject.yangutils.datamodel.YangDataTypes;
+import org.onosproject.yangutils.datamodel.YangGrouping;
+import org.onosproject.yangutils.datamodel.YangLeaf;
+import org.onosproject.yangutils.datamodel.YangList;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangNodeType;
+import org.onosproject.yangutils.datamodel.YangTypeDef;
+import org.onosproject.yangutils.datamodel.YangUses;
+import org.onosproject.yangutils.datamodel.utils.ResolvableStatus;
+import org.onosproject.yangutils.linker.exceptions.LinkerException;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.core.Is.is;
+
+/**
+ * Test cases for testing uses intra file linking.
+ */
+public class IntraFileUsesLinkingTest {
+
+    @Rule
+    public ExpectedException thrown = ExpectedException.none();
+
+    private final YangUtilsParserManager manager = new YangUtilsParserManager();
+
+    /**
+     * Checks self resolution when grouping and uses are siblings.
+     * Grouping followed by uses.
+     */
+    @Test
+    public void processSelfResolutionWhenUsesAndGroupingAtRootLevel()
+            throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/SelfResolutionWhenUsesAndGroupingAtRootLevel.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeaf> leafIterator;
+        YangLeaf leafInfo;
+
+        // Check whether grouping is the sibling of module's child.
+        assertThat((yangNode.getChild().getNextSibling() instanceof YangGrouping), is(true));
+
+        YangGrouping grouping = (YangGrouping) yangNode.getChild().getNextSibling();
+        leafIterator = grouping.getListOfLeaf().listIterator();
+        leafInfo = leafIterator.next();
+
+        // Check whether the information in the leaf is correct under grouping.
+        assertThat(leafInfo.getName(), is("hello"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("string"));
+        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.STRING));
+
+        // Check whether uses is module's child.
+        assertThat((yangNode.getChild() instanceof YangUses), is(true));
+        YangUses uses = (YangUses) yangNode.getChild();
+
+        // Check whether uses get resolved.
+        assertThat(uses.getResolvableStatus(),
+                is(ResolvableStatus.RESOLVED));
+
+//        leafIterator = yangNode.getListOfLeaf().listIterator();
+//        leafInfo = leafIterator.next();
+//
+//        // Check whether the information in the leaf is correct under module.
+//        assertThat(leafInfo.getName(), is("hello"));
+//        assertThat(leafInfo.getDataType().getDataTypeName(), is("string"));
+//        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.STRING));
+
+    }
+
+    /**
+     * Checks self resolution when grouping and uses are siblings.
+     * Grouping has a child node.
+     */
+    @Test
+    public void processSelfResolutionWhenUsesAndGroupingAtRootLevelGroupingWithChild()
+            throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel(
+                "src/test/resources/SelfResolutionWhenUsesAndGroupingAtRootLevelGroupingWithChild.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeaf> leafIterator;
+        YangLeaf leafInfo;
+
+        // Check whether grouping is the sibling of module's child.
+        assertThat((yangNode.getChild().getNextSibling() instanceof YangGrouping), is(true));
+
+        YangGrouping grouping = (YangGrouping) yangNode.getChild().getNextSibling();
+        leafIterator = grouping.getListOfLeaf().listIterator();
+        leafInfo = leafIterator.next();
+
+        // Check whether the information in the leaf is correct under grouping.
+        assertThat(leafInfo.getName(), is("treat"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("string"));
+        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.STRING));
+
+        // Check whether container is the child of grouping.
+        assertThat((grouping.getChild() instanceof YangContainer), is(true));
+        YangContainer container = (YangContainer) grouping.getChild();
+
+        // Check whether the container name is set correctly which is under grouping.
+        assertThat(container.getName(), is("test"));
+
+        leafIterator = container.getListOfLeaf().listIterator();
+        leafInfo = leafIterator.next();
+
+        // Check whether the information in the leaf is correct under container which is under grouping.
+        assertThat(leafInfo.getName(), is("leaf2"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("string"));
+        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.STRING));
+
+        // Check whether uses is module's child.
+        assertThat((yangNode.getChild() instanceof YangUses), is(true));
+        YangUses uses = (YangUses) yangNode.getChild();
+
+        // Check whether uses get resolved.
+        assertThat(uses.getResolvableStatus(),
+                is(ResolvableStatus.RESOLVED));
+
+//        leafIterator = yangNode.getListOfLeaf().listIterator();
+//        leafInfo = leafIterator.next();
+//
+//        // Check whether the information in the leaf is correct under module.
+//        assertThat(leafInfo.getName(), is("treat"));
+//        assertThat(leafInfo.getDataType().getDataTypeName(), is("string"));
+//        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.STRING));
+
+//        // Check whether container is the child of module.
+//        assertThat((grouping.getNextSibling() instanceof YangContainer), is(true));
+//        container = (YangContainer) grouping.getNextSibling();
+//
+//        // Check whether the container name is set correctly which is under module.
+//        assertThat(container.getName(), is("test"));
+//
+//        leafIterator = container.getListOfLeaf().listIterator();
+//        leafInfo = leafIterator.next();
+//
+//        // Check whether the information in the leaf is correct under container which is under module.
+//        assertThat(leafInfo.getName(), is("leaf2"));
+//        assertThat(leafInfo.getDataType().getDataTypeName(), is("string"));
+//        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.STRING));
+    }
+
+    /**
+     * Checks self resolution when grouping in rpc and uses in output of the same rpc.
+     * Uses is followed by grouping.
+     */
+    @Test
+    public void processSelfResolutionGroupingInRpcAndUsesInOutput()
+            throws IOException, ParserException {
+
+        YangNode node = manager
+                .getDataModel("src/test/resources/SelfResolutionGroupingInRpcAndUsesInOutput.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("rock"));
+
+        ListIterator<YangLeaf> leafIterator;
+        YangLeaf leafInfo;
+
+        // Check whether grouping is the child of rpc.
+        assertThat((yangNode.getChild().getChild() instanceof YangGrouping), is(true));
+        YangGrouping grouping = (YangGrouping) yangNode.getChild().getChild();
+
+        // Check whether the grouping name is set correctly.
+        assertThat(grouping.getName(), is("hello"));
+
+        // Check whether list is the child of grouping.
+        assertThat((grouping.getChild() instanceof YangList), is(true));
+        YangList yangListNode = (YangList) grouping.getChild();
+
+        // Check whether the list name is set correctly.
+        assertThat(yangListNode.getName(), is("valid"));
+
+        leafIterator = yangListNode.getListOfLeaf().listIterator();
+        leafInfo = leafIterator.next();
+
+        // Check whether the information in the leaf is correct under list which is under grouping.
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("uint16"));
+        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.UINT16));
+        assertThat(leafInfo.getUnits(), is("\"seconds\""));
+        assertThat(leafInfo.getReference(), is("\"RFC 6020\""));
+
+        // Check whether uses is input's child.
+        assertThat((yangNode.getChild().getChild().getNextSibling().getChild() instanceof YangUses), is(true));
+        YangUses uses = (YangUses) yangNode.getChild().getChild().getNextSibling().getChild();
+
+        // Check whether uses get resolved.
+        assertThat(uses.getResolvableStatus(),
+                is(ResolvableStatus.RESOLVED));
+
+//        // Check whether list is the sibling of uses which has been deep copied from grouping.
+//        assertThat((yangNode.getChild().getChild().getNextSibling().getChild().getNextSibling() instanceof YangList),
+//                is(true));
+//        YangList yangList = (YangList) yangNode.getChild().getChild().getNextSibling().getChild().getNextSibling();
+//
+//        // Check whether the list name is set correctly.
+//        assertThat(yangList.getName(), is("valid"));
+//
+//        leafIterator = yangList.getListOfLeaf().listIterator();
+//        leafInfo = leafIterator.next();
+//
+//        // Check whether the information in the leaf is correct under list which is deep copied.
+//        assertThat(leafInfo.getName(), is("invalid-interval"));
+//        assertThat(leafInfo.getDataType().getDataTypeName(), is("uint16"));
+//        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.UINT16));
+//        assertThat(leafInfo.getUnits(), is("\"seconds\""));
+//        assertThat(leafInfo.getReference(), is("\"RFC 6020\""));
+//
+//        // Check whether uses is output's child.
+//        assertThat((yangNode.getChild().getChild().getNextSibling().getNextSibling().getChild() instanceof YangUses),
+//                is(true));
+//        YangUses usesInOuput = (YangUses) yangNode.getChild().getChild().getNextSibling().getNextSibling().getChild();
+//
+//        // Check whether uses get resolved.
+//        assertThat(usesInOuput.getResolvableStatus(),
+//                is(ResolvableStatus.RESOLVED));
+//
+//        // Check whether list is the sibling of uses which has been deep copied from grouping.
+//        assertThat((yangNode.getChild().getChild().getNextSibling().getChild().getNextSibling() instanceof YangList),
+//                is(true));
+//
+//        YangList yangListInOutput = (YangList) yangNode.getChild().getChild().getNextSibling().getNextSibling()
+//                .getChild().getNextSibling();
+//
+//        // Check whether the list name is set correctly.
+//        assertThat(yangListInOutput.getName(), is("valid"));
+//
+//        leafIterator = yangListInOutput.getListOfLeaf().listIterator();
+//        leafInfo = leafIterator.next();
+//
+//        // Check whether the information in the leaf is correct under list which is deep copied.
+//        assertThat(leafInfo.getName(), is("invalid-interval"));
+//        assertThat(leafInfo.getDataType().getDataTypeName(), is("uint16"));
+//        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.UINT16));
+//        assertThat(leafInfo.getUnits(), is("\"seconds\""));
+//        assertThat(leafInfo.getReference(), is("\"RFC 6020\""));
+    }
+
+    /**
+     * Checks the failure scenario when uses is referring to its own grouping directly.
+     */
+    @Test
+    public void processSelfResolutionGroupingReferencingItselfFailureScenerio()
+            throws IOException {
+
+        thrown.expect(LinkerException.class);
+        thrown.expectMessage(
+                "YANG file error: Duplicate input identifier detected, same as leaf \"zip-code\"");
+        YangNode node = manager
+                .getDataModel("src/test/resources/SelfResolutionGroupingReferencingItselfFailureScenerio.yang");
+
+    }
+
+    /**
+     * Checks the when multiple uses are present and are referred to the grouping at different levels.
+     */
+    @Test
+    public void processSelfResolutionGroupingWithMultipleUses()
+            throws IOException, ParserException {
+
+        YangNode node = manager
+                .getDataModel("src/test/resources/SelfResolutionGroupingWithMultipleUses.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeaf> leafIterator;
+        YangLeaf leafInfo;
+
+        // Check whether grouping is the child of container.
+        assertThat((yangNode.getChild().getChild() instanceof YangGrouping), is(true));
+        YangGrouping grouping = (YangGrouping) yangNode.getChild().getChild();
+
+        // Check whether the grouping name is set correctly.
+        assertThat(grouping.getName(), is("endpoint"));
+
+        // Check whether uses is endpoint-grouping's child.
+        assertThat((grouping.getChild() instanceof YangUses), is(true));
+        YangUses firstUses = (YangUses) grouping.getChild();
+
+        // Check whether uses get resolved.
+        assertThat(firstUses.getResolvableStatus(),
+                is(ResolvableStatus.RESOLVED));
+
+        // Check whether container is the sibling of uses.
+        assertThat((firstUses.getNextSibling() instanceof YangContainer), is(true));
+        YangContainer yangContainer = (YangContainer) firstUses.getNextSibling();
+
+        // Check whether the container name is set correctly.
+        assertThat(yangContainer.getName(), is("design"));
+
+//        leafIterator = yangContainer.getListOfLeaf().listIterator();
+//        leafInfo = leafIterator.next();
+//
+//        // Check whether the information in the leaf is correct under design-container.
+//        assertThat(leafInfo.getName(), is("ink"));
+//        assertThat(leafInfo.getDataType().getDataTypeName(), is("int32"));
+//        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.INT32));
+
+        // Check whether uses is design-container's child.
+        assertThat((yangContainer.getChild() instanceof YangUses), is(true));
+        YangUses secondUses = (YangUses) yangContainer.getChild();
+
+        // Check whether uses get resolved.
+        assertThat(secondUses.getResolvableStatus(),
+                is(ResolvableStatus.RESOLVED));
+
+        // Check whether container is the sibling of uses.
+        assertThat((secondUses.getNextSibling() instanceof YangContainer), is(true));
+        YangContainer yangContainer2 = (YangContainer) secondUses.getNextSibling();
+        assertThat(yangContainer2.getName(), is("correct"));
+
+        leafIterator = yangContainer2.getListOfLeaf().listIterator();
+        leafInfo = leafIterator.next();
+
+        // Check whether the information in the leaf is correct under correct-container.
+        assertThat(leafInfo.getName(), is("newone"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("string"));
+        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.STRING));
+
+        // Check whether uses is correct container's child.
+        assertThat((yangContainer2.getChild() instanceof YangUses), is(true));
+        YangUses thirdUses = (YangUses) yangContainer2.getChild();
+
+        // Check whether uses get resolved.
+        assertThat(thirdUses.getResolvableStatus(),
+                is(ResolvableStatus.RESOLVED));
+
+//        // Check whether container is the sibling of uses.
+//        assertThat((thirdUses.getNextSibling() instanceof YangContainer), is(true));
+//
+//        YangContainer yangContainer3 = (YangContainer) thirdUses.getNextSibling();
+//        assertThat(yangContainer3.getName(), is("value"));
+//
+//        leafIterator = yangContainer3.getListOfLeaf().listIterator();
+//        leafInfo = leafIterator.next();
+//
+//        // Check whether the information in the leaf is correct under container
+//        // which has been deep copied from grouping.
+//        assertThat(leafInfo.getName(), is("zip-code"));
+//        assertThat(leafInfo.getDataType().getDataTypeName(), is("string"));
+//        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.STRING));
+//
+//        // Check whether uses is the sibling of container-design.
+//        assertThat((yangContainer.getNextSibling() instanceof YangUses), is(true));
+//        YangUses fourthUses = (YangUses) yangContainer.getNextSibling();
+//
+//        // Check whether uses get resolved.
+//        assertThat(fourthUses.getResolvableStatus(),
+//                is(ResolvableStatus.RESOLVED));
+//
+//        // Check whether uses is the sibling of previous uses.
+//        assertThat((fourthUses.getNextSibling() instanceof YangUses), is(true));
+//        YangUses fifthUses = (YangUses) fourthUses.getNextSibling();
+//
+//        // Check whether uses get resolved.
+//        assertThat(fifthUses.getResolvableStatus(),
+//                is(ResolvableStatus.RESOLVED));
+//
+//        // Check whether list is the sibling of uses.
+//        assertThat((fifthUses.getNextSibling() instanceof YangList), is(true));
+//        YangList yangList = (YangList) fifthUses.getNextSibling();
+//        assertThat(yangList.getName(), is("valid"));
+//
+//        leafIterator = yangList.getListOfLeaf().listIterator();
+//        leafInfo = leafIterator.next();
+//
+//        // Check whether the information in the leaf is correct under list which has been deep copied from grouping.
+//        assertThat(leafInfo.getName(), is("invalid-interval"));
+//        assertThat(leafInfo.getDataType().getDataTypeName(), is("uint16"));
+//        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.UINT16));
+//        assertThat(leafInfo.getUnits(), is("\"seconds\""));
+//        assertThat(leafInfo.getReference(), is("\"RFC 6020\""));
+//
+//        // Check whether typedef is the sibling of list.
+//        assertThat((yangList.getNextSibling() instanceof YangTypeDef), is(true));
+//        YangTypeDef yangTypeDef = (YangTypeDef) yangList.getNextSibling();
+//        assertThat(yangTypeDef.getName(), is("my-type"));
+//
+//        leafIterator = grouping.getListOfLeaf().listIterator();
+//        leafInfo = leafIterator.next();
+//
+//        // Check whether the information in the leaf is correct under grouping.
+//        assertThat(leafInfo.getName(), is("zip-code"));
+//        assertThat(leafInfo.getDataType().getDataTypeName(), is("string"));
+//        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.STRING));
+//
+//        // Check whether uses is endpoint-grouping's sibling.
+//        assertThat((grouping.getNextSibling() instanceof YangUses), is(true));
+//        YangUses endpointUses = (YangUses) grouping.getNextSibling();
+//
+//        // Check whether uses get resolved.
+//        assertThat(endpointUses.getResolvableStatus(),
+//                is(ResolvableStatus.RESOLVED));
+//
+//        assertThat((endpointUses.getNextSibling().getNextSibling().getNextSibling().getNextSibling().getNextSibling()
+//                .getNextSibling() instanceof YangUses), is(true));
+//
+//        YangUses yangUsesInEndpoint = (YangUses) endpointUses.getNextSibling().getNextSibling().getNextSibling()
+//                .getNextSibling().getNextSibling().getNextSibling();
+//        assertThat(yangUsesInEndpoint.getResolvableStatus(),
+//                is(ResolvableStatus.RESOLVED));
+//
+//        assertThat((yangUsesInEndpoint.getNextSibling() instanceof YangContainer), is(true));
+//        YangContainer yangContainerInEndPoint = (YangContainer) yangUsesInEndpoint.getNextSibling();
+//
+//        assertThat(yangContainerInEndPoint.getName(), is("design"));
+    }
+
+    /**
+     * Checks the failure scenario when uses is present under the same node many times.
+     */
+    @Test
+    public void processSelfResolutionGroupingHavingSameUsesManyTimes()
+            throws IOException, ParserException {
+
+        thrown.expect(ParserException.class);
+        thrown.expectMessage(
+                "YANG file error: Duplicate input identifier detected, same as uses \"failure\"");
+        YangNode node = manager
+                .getDataModel("src/test/resources/SelfResolutionGroupingHavingSameUsesManyTimes.yang");
+    }
+
+    /**
+     * Checks the rpc having both typedef and grouping.
+     * It also checks that the grouping under different nodes will not give any problem in resolving uses.
+     */
+    @Test
+    public void processSelfResolutionRpcWithOneTypedefAndTwoGroupingUnderDifferentNode()
+            throws IOException, ParserException {
+
+        YangNode node = manager
+                .getDataModel(
+                        "src/test/resources/SelfResolutionRpcWithOneTypedefAndTwoGroupingUnderDifferentNode.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("rock"));
+
+        ListIterator<YangLeaf> leafIterator;
+        YangLeaf leafInfo;
+
+        // Check whether grouping is the child of input.
+        assertThat((yangNode.getChild().getChild().getChild() instanceof YangGrouping), is(true));
+        YangGrouping groupingUnderInput = (YangGrouping) yangNode.getChild().getChild().getChild();
+
+        // Check whether the grouping name is set correctly.
+        assertThat(groupingUnderInput.getName(), is("creative"));
+
+        leafIterator = groupingUnderInput.getListOfLeaf().listIterator();
+        leafInfo = leafIterator.next();
+
+        // Check whether the information in the leaf is correct under grouping.
+        assertThat(leafInfo.getName(), is("carry"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("string"));
+        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.STRING));
+
+        // Check whether grouping is the child of output.
+        assertThat((yangNode.getChild().getChild().getNextSibling().getChild() instanceof YangGrouping), is(true));
+        YangGrouping grouping = (YangGrouping) yangNode.getChild().getChild().getNextSibling().getChild();
+        assertThat(grouping.getName(), is("creative"));
+
+        // Check whether typedef is the sibling of grouping.
+        assertThat((grouping.getNextSibling() instanceof YangTypeDef), is(true));
+
+        YangTypeDef typedef = (YangTypeDef) grouping.getNextSibling();
+        assertThat(typedef.getName(), is("my-type"));
+
+        // Check whether uses is the sibling of typedef.
+        assertThat((typedef.getNextSibling() instanceof YangUses), is(true));
+
+        // Check whether uses get resolved.
+        YangUses uses = (YangUses) typedef.getNextSibling();
+        assertThat(uses.getName(), is("creative"));
+        assertThat(uses.getResolvableStatus(),
+                is(ResolvableStatus.RESOLVED));
+    }
+
+    /**
+     * Checks the failure scenario when uses is cannot resolve its grouping.
+     */
+    @Test
+    public void processSelfResolutionNestedGroupingWithUnresolvedUses()
+            throws IOException, LinkerException {
+
+        thrown.expect(LinkerException.class);
+        thrown.expectMessage(
+                "YANG file error: Unable to find base grouping for given uses");
+
+        YangNode node = manager
+                .getDataModel("src/test/resources/SelfResolutionNestedGroupingWithUnresolvedUses.yang");
+    }
+
+    /**
+     * Checks self resolution when typedef hierarchical references are present
+     * with last type is unresolved.
+     */
+    @Test
+    public void processSelfFileLinkingWithGroupingHierarchicalRefUnresolved()
+            throws IOException, ParserException {
+
+        YangNode node = manager
+                .getDataModel("src/test/resources/SelfFileLinkingWithGroupingHierarchicalRefUnresolved.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        // Check whether container is the sibling of grouping.
+        assertThat((yangNode.getChild().getNextSibling() instanceof YangContainer), is(true));
+        YangContainer containerWithUses = (YangContainer) yangNode.getChild().getNextSibling();
+        assertThat(containerWithUses.getName(), is("test"));
+
+        // Check whether uses is the child of container.
+        assertThat((containerWithUses.getChild() instanceof YangUses), is(true));
+        YangUses uses = (YangUses) containerWithUses.getChild();
+        assertThat(uses.getName(), is("create"));
+
+        // Check whether uses is getting resolved.
+        assertThat(uses.getResolvableStatus(),
+                is(ResolvableStatus.RESOLVED));
+
+        // Check whether grouping is the child of module.
+        assertThat((yangNode.getChild() instanceof YangGrouping), is(true));
+        YangGrouping groupingWithUses = (YangGrouping) yangNode.getChild();
+        assertThat(groupingWithUses.getName(), is("create"));
+
+        // Check whether uses with prefix from from other file, is the child of grouping.
+        assertThat((groupingWithUses.getChild() instanceof YangUses), is(true));
+        YangUses uses1 = (YangUses) groupingWithUses.getChild();
+        assertThat(uses1.getName(), is("valid"));
+
+        // Check whether this uses is getting intra-file-resolved.
+        assertThat(uses1.getResolvableStatus(),
+                is(ResolvableStatus.INTRA_FILE_RESOLVED));
+    }
+
+    /**
+     * Checks self resolution when uses has prefix of self module.
+     */
+    @Test
+    public void processSelfFileLinkingWithGroupingWithSelfModulePrefix()
+            throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/SelfFileLinkingWithGroupingWithSelfModulePrefix.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        // Check whether container is the sibling of grouping.
+        YangContainer yangContainer = (YangContainer) node.getChild().getNextSibling();
+
+        // Check whether list is the child of container.
+        YangList yangList = (YangList) yangContainer.getChild();
+
+        // Check whether uses is the child of list.
+        assertThat((yangList.getChild() instanceof YangUses), is(true));
+        YangUses yangUses1 = (YangUses) yangList.getChild();
+        assertThat(yangUses1.getName(), is("FirstClass"));
+
+        // Check whether uses is getting resolved.
+        assertThat(yangUses1.getResolvableStatus(),
+                is(ResolvableStatus.RESOLVED));
+
+        // Check whether grouping is the sibling of uses.
+        YangGrouping yangGrouping1 = (YangGrouping) yangUses1.getNextSibling();
+        assertThat(yangGrouping1.getName(), is("FirstClass"));
+
+        // Check whether uses is the child of grouping.
+        YangUses yangUses2 = (YangUses) yangGrouping1.getChild();
+        assertThat(yangUses2.getName(), is("PassingClass"));
+
+        // Check the uses gets resolved.
+        assertThat(yangUses2.getResolvableStatus(),
+                is(ResolvableStatus.RESOLVED));
+
+        // Check whether grouping is the sibling of list.
+        YangGrouping yangGrouping2 = (YangGrouping) yangList.getNextSibling();
+        assertThat(yangGrouping2.getName(), is("PassingClass"));
+
+        // Check uses is the child of that grouping which has prefix of the same module.
+        YangUses yangUses3 = (YangUses) yangGrouping2.getChild();
+        assertThat(yangUses3.getName(), is("Percentage"));
+
+        // Check uses is getting resolved.
+        assertThat(yangUses3.getResolvableStatus(),
+                is(ResolvableStatus.RESOLVED));
+
+        // Check grouping is the child of module.
+        YangGrouping yangGrouping3 = (YangGrouping) node.getChild();
+
+        ListIterator<YangLeaf> leafIterator;
+        YangLeaf leafInfo;
+        leafIterator = yangGrouping3.getListOfLeaf().listIterator();
+        leafInfo = leafIterator.next();
+
+        // Check whether the information in the leaf is correct under grouping.
+        assertThat(leafInfo.getName(), is("hello"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("string"));
+        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.STRING));
+
+    }
+
+    /**
+     * Checks self resolution when some type uses prefix of self module
+     * some uses external prefix.
+     */
+    @Test
+    public void processSelfFileLinkingWithGroupingWithSelfAndExternalPrefixMix()
+            throws IOException, ParserException {
+
+        YangNode node = manager
+                .getDataModel("src/test/resources/SelfFileLinkingWithGroupingWithSelfAndExternalPrefixMix.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        // Check whether container is the sibling of grouping.
+        YangContainer yangContainer = (YangContainer) node.getChild().getNextSibling();
+
+        // Check whether list is the child of container.
+        YangList yangList = (YangList) yangContainer.getChild();
+
+        // Check whether uses is the child of list.
+        assertThat((yangList.getChild() instanceof YangUses), is(true));
+        YangUses yangUses1 = (YangUses) yangList.getChild();
+        assertThat(yangUses1.getName(), is("FirstClass"));
+
+        // Check whether uses is getting resolved.
+        assertThat(yangUses1.getResolvableStatus(),
+                is(ResolvableStatus.RESOLVED));
+
+        // Check whether grouping is the sibling of uses.
+        YangGrouping yangGrouping1 = (YangGrouping) yangUses1.getNextSibling();
+        assertThat(yangGrouping1.getName(), is("FirstClass"));
+
+        // Check whether uses is the child of grouping which has prefix from other module.
+        YangUses yangUses2 = (YangUses) yangGrouping1.getChild();
+        assertThat(yangUses2.getName(), is("PassingClass"));
+
+        // Check whether uses gets intra-file-resolved.
+        assertThat(yangUses2.getResolvableStatus(),
+                is(ResolvableStatus.INTRA_FILE_RESOLVED));
+
+        // Check whether grouping is the sibling of list.
+        YangGrouping yangGrouping2 = (YangGrouping) yangList.getNextSibling();
+        assertThat(yangGrouping2.getName(), is("PassingClass"));
+
+        // Check uses is the child of that grouping which has prefix of the same module.
+        YangUses yangUses3 = (YangUses) yangGrouping2.getChild();
+        assertThat(yangUses3.getName(), is("Percentage"));
+
+        // Check uses is getting resolved.
+        assertThat(yangUses3.getResolvableStatus(),
+                is(ResolvableStatus.RESOLVED));
+
+        // Check grouping is the child of module.
+        YangGrouping yangGrouping3 = (YangGrouping) node.getChild();
+        ListIterator<YangLeaf> leafIterator;
+        YangLeaf leafInfo;
+        leafIterator = yangGrouping3.getListOfLeaf().listIterator();
+        leafInfo = leafIterator.next();
+
+        // Check whether the information in the leaf is correct under grouping.
+        assertThat(leafInfo.getName(), is("hello"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("string"));
+        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.STRING));
+    }
+
+}
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/linker/RestrictionResolutionTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/linker/RestrictionResolutionTest.java
new file mode 100644
index 0000000..211f924
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/linker/RestrictionResolutionTest.java
@@ -0,0 +1,835 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.linker;
+
+import java.io.IOException;
+import java.math.BigInteger;
+import java.util.ListIterator;
+import org.junit.Test;
+import org.onosproject.yangutils.datamodel.YangDerivedInfo;
+import org.onosproject.yangutils.datamodel.YangLeaf;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangPatternRestriction;
+import org.onosproject.yangutils.datamodel.YangRangeInterval;
+import org.onosproject.yangutils.datamodel.YangRangeRestriction;
+import org.onosproject.yangutils.datamodel.YangStringRestriction;
+import org.onosproject.yangutils.datamodel.YangTypeDef;
+import org.onosproject.yangutils.datamodel.exceptions.DataModelException;
+import org.onosproject.yangutils.datamodel.utils.builtindatatype.YangInt32;
+import org.onosproject.yangutils.datamodel.utils.builtindatatype.YangUint64;
+import org.onosproject.yangutils.linker.exceptions.LinkerException;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
+
+import static org.hamcrest.CoreMatchers.nullValue;
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.core.Is.is;
+import static org.hamcrest.core.IsNull.notNullValue;
+import static org.onosproject.yangutils.datamodel.YangDataTypes.DERIVED;
+import static org.onosproject.yangutils.datamodel.YangDataTypes.INT32;
+import static org.onosproject.yangutils.datamodel.YangDataTypes.STRING;
+import static org.onosproject.yangutils.datamodel.YangNodeType.MODULE_NODE;
+import static org.onosproject.yangutils.datamodel.utils.ResolvableStatus.RESOLVED;
+
+/**
+ * Test cases for testing restriction resolution.
+ */
+public final class RestrictionResolutionTest {
+
+    private final YangUtilsParserManager manager = new YangUtilsParserManager();
+
+    /**
+     * Checks length restriction in typedef.
+     */
+    @Test
+    public void processLengthRestrictionInTypedef()
+            throws IOException, ParserException, DataModelException {
+
+        YangNode node = manager.getDataModel("src/test/resources/LengthRestrictionInTypedef.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat(node instanceof YangModule, is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("hello"));
+        assertThat(leafInfo.getDataType().getDataType(), is(DERIVED));
+
+        assertThat(((YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo()).getReferredTypeDef(),
+                is((YangTypeDef) node.getChild()));
+
+        assertThat(leafInfo.getDataType().getResolvableStatus(), is(RESOLVED));
+
+        YangDerivedInfo<?> derivedInfo = (YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo();
+
+        // Check for the effective built-in type.
+        assertThat(derivedInfo.getEffectiveBuiltInType(), is(STRING));
+
+        // Check for the restriction.
+        assertThat(derivedInfo.getLengthRestrictionString(), is(nullValue()));
+        assertThat(derivedInfo.getRangeRestrictionString(), is(nullValue()));
+        assertThat(derivedInfo.getPatternRestriction(), is(nullValue()));
+        assertThat(derivedInfo.getResolvedExtendedInfo(), is(notNullValue()));
+
+        // Check for the restriction value.
+        YangStringRestriction stringRestriction = (YangStringRestriction) derivedInfo.getResolvedExtendedInfo();
+        YangRangeRestriction lengthRestriction = stringRestriction.getLengthRestriction();
+
+        ListIterator<YangRangeInterval> lengthListIterator = lengthRestriction.getAscendingRangeIntervals()
+                .listIterator();
+
+        YangRangeInterval rangeInterval = lengthListIterator.next();
+
+        assertThat(((YangUint64) rangeInterval.getStartValue()).getValue(), is(BigInteger.valueOf(0)));
+        assertThat(((YangUint64) rangeInterval.getEndValue()).getValue(), is(BigInteger.valueOf(100)));
+    }
+
+    /**
+     * Checks length restriction in referred type.
+     */
+    @Test
+    public void processLengthRestrictionInRefType()
+            throws IOException, ParserException, DataModelException {
+
+        YangNode node = manager.getDataModel("src/test/resources/LengthRestrictionInRefType.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat(node instanceof YangModule, is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("hello"));
+        assertThat(leafInfo.getDataType().getDataType(), is(DERIVED));
+
+        assertThat(((YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo()).getReferredTypeDef(),
+                is((YangTypeDef) node.getChild()));
+
+        assertThat(leafInfo.getDataType().getResolvableStatus(), is(RESOLVED));
+
+        YangDerivedInfo<?> derivedInfo = (YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo();
+
+        // Check for the effective built-in type.
+        assertThat(derivedInfo.getEffectiveBuiltInType(), is(STRING));
+
+        // Check for the restriction.
+        assertThat(derivedInfo.getLengthRestrictionString(), is(notNullValue()));
+        assertThat(derivedInfo.getRangeRestrictionString(), is(nullValue()));
+        assertThat(derivedInfo.getPatternRestriction(), is(nullValue()));
+        assertThat(derivedInfo.getResolvedExtendedInfo(), is(notNullValue()));
+
+        // Check for the restriction value.
+        YangStringRestriction stringRestriction = (YangStringRestriction) derivedInfo.getResolvedExtendedInfo();
+        YangRangeRestriction lengthRestriction = stringRestriction.getLengthRestriction();
+
+        ListIterator<YangRangeInterval> lengthListIterator = lengthRestriction.getAscendingRangeIntervals()
+                .listIterator();
+
+        YangRangeInterval rangeInterval = lengthListIterator.next();
+
+        assertThat(((YangUint64) rangeInterval.getStartValue()).getValue(), is(BigInteger.valueOf(0)));
+        assertThat(((YangUint64) rangeInterval.getEndValue()).getValue(), is(BigInteger.valueOf(100)));
+    }
+
+    /**
+     * Checks length restriction in typedef and in type with stricter value.
+     */
+    @Test
+    public void processLengthRestrictionInTypedefAndTypeValid()
+            throws IOException, ParserException, DataModelException {
+
+        YangNode node = manager.getDataModel("src/test/resources/LengthRestrictionInTypedefAndTypeValid.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat(node instanceof YangModule, is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("hello"));
+        assertThat(leafInfo.getDataType().getDataType(), is(DERIVED));
+
+        assertThat(((YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo()).getReferredTypeDef(),
+                is((YangTypeDef) node.getChild()));
+
+        assertThat(leafInfo.getDataType().getResolvableStatus(), is(RESOLVED));
+
+        YangDerivedInfo<?> derivedInfo = (YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo();
+
+        // Check for the effective built-in type.
+        assertThat(derivedInfo.getEffectiveBuiltInType(), is(STRING));
+
+        // Check for the restriction.
+        assertThat(derivedInfo.getLengthRestrictionString(), is(notNullValue()));
+        assertThat(derivedInfo.getRangeRestrictionString(), is(nullValue()));
+        assertThat(derivedInfo.getPatternRestriction(), is(nullValue()));
+        assertThat(derivedInfo.getResolvedExtendedInfo(), is(notNullValue()));
+
+        // Check for the restriction value.
+        YangStringRestriction stringRestriction = (YangStringRestriction) derivedInfo.getResolvedExtendedInfo();
+        YangRangeRestriction lengthRestriction = stringRestriction.getLengthRestriction();
+
+        ListIterator<YangRangeInterval> lengthListIterator = lengthRestriction.getAscendingRangeIntervals()
+                .listIterator();
+
+        YangRangeInterval rangeInterval1 = lengthListIterator.next();
+
+        assertThat(((YangUint64) rangeInterval1.getStartValue()).getValue(), is(BigInteger.valueOf(0)));
+        assertThat(((YangUint64) rangeInterval1.getEndValue()).getValue(), is(BigInteger.valueOf(20)));
+
+        YangRangeInterval rangeInterval2 = lengthListIterator.next();
+
+        assertThat(((YangUint64) rangeInterval2.getStartValue()).getValue(), is(BigInteger.valueOf(201)));
+        assertThat(((YangUint64) rangeInterval2.getEndValue()).getValue(), is(BigInteger.valueOf(300)));
+    }
+
+    /**
+     * Checks length restriction in typedef and in type with not stricter value.
+     */
+    @Test(expected = LinkerException.class)
+    public void processLengthRestrictionInTypedefAndTypeInValid()
+            throws IOException, DataModelException {
+        YangNode node = manager.getDataModel("src/test/resources/LengthRestrictionInTypedefAndTypeInValid.yang");
+    }
+
+    /**
+     * Checks range restriction in typedef.
+     */
+    @Test
+    public void processRangeRestrictionInTypedef()
+            throws IOException, ParserException, DataModelException {
+
+        YangNode node = manager.getDataModel("src/test/resources/RangeRestrictionInTypedef.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat(node instanceof YangModule, is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("hello"));
+        assertThat(leafInfo.getDataType().getDataType(), is(DERIVED));
+
+        assertThat(((YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo()).getReferredTypeDef(),
+                is((YangTypeDef) node.getChild()));
+
+        assertThat(leafInfo.getDataType().getResolvableStatus(), is(RESOLVED));
+
+        YangDerivedInfo<?> derivedInfo = (YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo();
+
+        // Check for the effective built-in type.
+        assertThat(derivedInfo.getEffectiveBuiltInType(), is(INT32));
+
+        // Check for the restriction.
+        assertThat(derivedInfo.getLengthRestrictionString(), is(nullValue()));
+        assertThat(derivedInfo.getRangeRestrictionString(), is(nullValue()));
+        assertThat(derivedInfo.getPatternRestriction(), is(nullValue()));
+        assertThat(derivedInfo.getResolvedExtendedInfo(), is(notNullValue()));
+
+        // Check for the restriction value.
+        YangRangeRestriction rangeRestriction = (YangRangeRestriction) derivedInfo.getResolvedExtendedInfo();
+
+        ListIterator<YangRangeInterval> rangeListIterator = rangeRestriction.getAscendingRangeIntervals()
+                .listIterator();
+
+        YangRangeInterval rangeInterval1 = rangeListIterator.next();
+
+        assertThat(((YangInt32) rangeInterval1.getStartValue()).getValue(), is(1));
+        assertThat(((YangInt32) rangeInterval1.getEndValue()).getValue(), is(4));
+
+        YangRangeInterval rangeInterval2 = rangeListIterator.next();
+
+        assertThat(((YangInt32) rangeInterval2.getStartValue()).getValue(), is(10));
+        assertThat(((YangInt32) rangeInterval2.getEndValue()).getValue(), is(20));
+    }
+
+    /**
+     * Checks range restriction in referred type.
+     */
+    @Test
+    public void processRangeRestrictionInRefType()
+            throws IOException, ParserException, DataModelException {
+
+        YangNode node = manager.getDataModel("src/test/resources/RangeRestrictionInRefType.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat(node instanceof YangModule, is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("hello"));
+        assertThat(leafInfo.getDataType().getDataType(), is(DERIVED));
+
+        assertThat(((YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo()).getReferredTypeDef(),
+                is((YangTypeDef) node.getChild()));
+
+        assertThat(leafInfo.getDataType().getResolvableStatus(), is(RESOLVED));
+
+        YangDerivedInfo<?> derivedInfo = (YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo();
+
+        // Check for the effective built-in type.
+        assertThat(derivedInfo.getEffectiveBuiltInType(), is(INT32));
+
+        // Check for the restriction.
+        assertThat(derivedInfo.getLengthRestrictionString(), is(nullValue()));
+        assertThat(derivedInfo.getRangeRestrictionString(), is(notNullValue()));
+        assertThat(derivedInfo.getPatternRestriction(), is(nullValue()));
+        assertThat(derivedInfo.getResolvedExtendedInfo(), is(notNullValue()));
+
+        // Check for the restriction value.
+        YangRangeRestriction rangeRestriction = (YangRangeRestriction) derivedInfo.getResolvedExtendedInfo();
+
+        ListIterator<YangRangeInterval> rangeListIterator = rangeRestriction.getAscendingRangeIntervals()
+                .listIterator();
+
+        YangRangeInterval rangeInterval1 = rangeListIterator.next();
+
+        assertThat(((YangInt32) rangeInterval1.getStartValue()).getValue(), is(1));
+        assertThat(((YangInt32) rangeInterval1.getEndValue()).getValue(), is(4));
+
+        YangRangeInterval rangeInterval2 = rangeListIterator.next();
+
+        assertThat(((YangInt32) rangeInterval2.getStartValue()).getValue(), is(10));
+        assertThat(((YangInt32) rangeInterval2.getEndValue()).getValue(), is(20));
+    }
+
+    /**
+     * Checks range restriction in typedef and stricter in referred type.
+     */
+    @Test
+    public void processRangeRestrictionInRefTypeAndTypedefValid()
+            throws IOException, ParserException, DataModelException {
+
+        YangNode node = manager.getDataModel("src/test/resources/RangeRestrictionInRefTypeAndTypedefValid.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat(node instanceof YangModule, is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("hello"));
+        assertThat(leafInfo.getDataType().getDataType(), is(DERIVED));
+
+        assertThat(((YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo()).getReferredTypeDef(),
+                is((YangTypeDef) node.getChild()));
+
+        assertThat(leafInfo.getDataType().getResolvableStatus(), is(RESOLVED));
+
+        YangDerivedInfo<?> derivedInfo = (YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo();
+
+        // Check for the effective built-in type.
+        assertThat(derivedInfo.getEffectiveBuiltInType(), is(INT32));
+
+        // Check for the restriction.
+        assertThat(derivedInfo.getLengthRestrictionString(), is(nullValue()));
+        assertThat(derivedInfo.getRangeRestrictionString(), is(notNullValue()));
+        assertThat(derivedInfo.getPatternRestriction(), is(nullValue()));
+        assertThat(derivedInfo.getResolvedExtendedInfo(), is(notNullValue()));
+
+        // Check for the restriction value.
+        YangRangeRestriction rangeRestriction = (YangRangeRestriction) derivedInfo.getResolvedExtendedInfo();
+
+        ListIterator<YangRangeInterval> rangeListIterator = rangeRestriction.getAscendingRangeIntervals()
+                .listIterator();
+
+        YangRangeInterval rangeInterval1 = rangeListIterator.next();
+
+        assertThat(((YangInt32) rangeInterval1.getStartValue()).getValue(), is(1));
+        assertThat(((YangInt32) rangeInterval1.getEndValue()).getValue(), is(4));
+
+        YangRangeInterval rangeInterval2 = rangeListIterator.next();
+
+        assertThat(((YangInt32) rangeInterval2.getStartValue()).getValue(), is(10));
+        assertThat(((YangInt32) rangeInterval2.getEndValue()).getValue(), is(20));
+    }
+
+    /**
+     * Checks range restriction in typedef and not stricter in referred type.
+     */
+    @Test(expected = LinkerException.class)
+    public void processRangeRestrictionInRefTypeAndTypedefInValid()
+            throws IOException, ParserException, DataModelException {
+        YangNode node = manager.getDataModel("src/test/resources/RangeRestrictionInRefTypeAndTypedefInValid.yang");
+    }
+
+    /**
+     * Checks range restriction for string.
+     */
+    @Test(expected = ParserException.class)
+    public void processRangeRestrictionInString()
+            throws IOException, ParserException, DataModelException {
+        YangNode node = manager.getDataModel("src/test/resources/RangeRestrictionInString.yang");
+    }
+
+    /**
+     * Checks range restriction for string in referred type.
+     */
+    @Test(expected = LinkerException.class)
+    public void processRangeRestrictionInStringInRefType()
+            throws IOException, DataModelException {
+        YangNode node = manager.getDataModel("src/test/resources/RangeRestrictionInStringInRefType.yang");
+    }
+
+    /**
+     * Checks pattern restriction in typedef.
+     */
+    @Test
+    public void processPatternRestrictionInTypedef()
+            throws IOException, ParserException, DataModelException {
+
+        YangNode node = manager.getDataModel("src/test/resources/PatternRestrictionInTypedef.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat(node instanceof YangModule, is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("hello"));
+        assertThat(leafInfo.getDataType().getDataType(), is(DERIVED));
+
+        assertThat(((YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo()).getReferredTypeDef(),
+                is((YangTypeDef) node.getChild()));
+
+        assertThat(leafInfo.getDataType().getResolvableStatus(), is(RESOLVED));
+
+        YangDerivedInfo<?> derivedInfo = (YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo();
+
+        // Check for the effective built-in type.
+        assertThat(derivedInfo.getEffectiveBuiltInType(), is(STRING));
+
+        // Check for the restriction.
+        assertThat(derivedInfo.getLengthRestrictionString(), is(nullValue()));
+        assertThat(derivedInfo.getRangeRestrictionString(), is(nullValue()));
+        assertThat(derivedInfo.getPatternRestriction(), is(nullValue()));
+        assertThat(derivedInfo.getResolvedExtendedInfo(), is(notNullValue()));
+
+        // Check for the restriction value.
+        YangStringRestriction stringRestriction = (YangStringRestriction) derivedInfo.getResolvedExtendedInfo();
+        YangPatternRestriction patternRestriction = stringRestriction.getPatternRestriction();
+
+        ListIterator<String> patternListIterator = patternRestriction.getPatternList().listIterator();
+        String pattern1 = patternListIterator.next();
+
+        assertThat(pattern1, is("[a-zA-Z]"));
+    }
+
+    /**
+     * Checks pattern restriction in referred type.
+     */
+    @Test
+    public void processPatternRestrictionInRefType()
+            throws IOException, ParserException, DataModelException {
+
+        YangNode node = manager.getDataModel("src/test/resources/PatternRestrictionInRefType.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat(node instanceof YangModule, is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("hello"));
+        assertThat(leafInfo.getDataType().getDataType(), is(DERIVED));
+
+        assertThat(((YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo()).getReferredTypeDef(),
+                is((YangTypeDef) node.getChild()));
+
+        assertThat(leafInfo.getDataType().getResolvableStatus(), is(RESOLVED));
+
+        YangDerivedInfo<?> derivedInfo = (YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo();
+
+        // Check for the effective built-in type.
+        assertThat(derivedInfo.getEffectiveBuiltInType(), is(STRING));
+
+        // Check for the restriction.
+        assertThat(derivedInfo.getLengthRestrictionString(), is(nullValue()));
+        assertThat(derivedInfo.getRangeRestrictionString(), is(nullValue()));
+        assertThat(derivedInfo.getPatternRestriction(), is(notNullValue()));
+        assertThat(derivedInfo.getResolvedExtendedInfo(), is(notNullValue()));
+
+        // Check for the restriction value.
+        YangStringRestriction stringRestriction = (YangStringRestriction) derivedInfo.getResolvedExtendedInfo();
+        YangPatternRestriction patternRestriction = stringRestriction.getPatternRestriction();
+
+        ListIterator<String> patternListIterator = patternRestriction.getPatternList().listIterator();
+        String pattern1 = patternListIterator.next();
+
+        assertThat(pattern1, is("[a-zA-Z]"));
+    }
+
+    /**
+     * Checks pattern restriction in referred type and typedef.
+     */
+    @Test
+    public void processPatternRestrictionInRefTypeAndTypedef()
+            throws IOException, ParserException, DataModelException {
+
+        YangNode node = manager.getDataModel("src/test/resources/PatternRestrictionInRefTypeAndTypedef.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat(node instanceof YangModule, is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("hello"));
+        assertThat(leafInfo.getDataType().getDataType(), is(DERIVED));
+
+        assertThat(((YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo()).getReferredTypeDef(),
+                is((YangTypeDef) node.getChild()));
+
+        assertThat(leafInfo.getDataType().getResolvableStatus(), is(RESOLVED));
+
+        YangDerivedInfo<?> derivedInfo = (YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo();
+
+        // Check for the effective built-in type.
+        assertThat(derivedInfo.getEffectiveBuiltInType(), is(STRING));
+
+        // Check for the restriction.
+        assertThat(derivedInfo.getLengthRestrictionString(), is(nullValue()));
+        assertThat(derivedInfo.getRangeRestrictionString(), is(nullValue()));
+        assertThat(derivedInfo.getPatternRestriction(), is(notNullValue()));
+        assertThat(derivedInfo.getResolvedExtendedInfo(), is(notNullValue()));
+
+        // Check for the restriction value.
+        YangStringRestriction stringRestriction = (YangStringRestriction) derivedInfo.getResolvedExtendedInfo();
+        YangPatternRestriction patternRestriction = stringRestriction.getPatternRestriction();
+
+        ListIterator<String> patternListIterator = patternRestriction.getPatternList().listIterator();
+        String pattern1 = patternListIterator.next();
+
+        assertThat(pattern1, is("[a-zA-Z]"));
+
+        String pattern2 = patternListIterator.next();
+
+        assertThat(pattern2, is("[0-9]"));
+    }
+
+    /**
+     * Checks multiple pattern restriction in referred type and typedef.
+     */
+    @Test
+    public void processMultiplePatternRestriction()
+            throws IOException, ParserException, DataModelException {
+
+        YangNode node = manager.getDataModel("src/test/resources/MultiplePatternRestrictionInRefTypeAndTypedef.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat(node instanceof YangModule, is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("hello"));
+        assertThat(leafInfo.getDataType().getDataType(), is(DERIVED));
+
+        assertThat(((YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo()).getReferredTypeDef(),
+                is((YangTypeDef) node.getChild()));
+
+        assertThat(leafInfo.getDataType().getResolvableStatus(), is(RESOLVED));
+
+        YangDerivedInfo<?> derivedInfo = (YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo();
+
+        // Check for the effective built-in type.
+        assertThat(derivedInfo.getEffectiveBuiltInType(), is(STRING));
+
+        // Check for the restriction.
+        assertThat(derivedInfo.getLengthRestrictionString(), is(nullValue()));
+        assertThat(derivedInfo.getRangeRestrictionString(), is(nullValue()));
+        assertThat(derivedInfo.getPatternRestriction(), is(notNullValue()));
+        assertThat(derivedInfo.getResolvedExtendedInfo(), is(notNullValue()));
+
+        // Check for the restriction value.
+        YangStringRestriction stringRestriction = (YangStringRestriction) derivedInfo.getResolvedExtendedInfo();
+        YangPatternRestriction patternRestriction = stringRestriction.getPatternRestriction();
+
+        ListIterator<String> patternListIterator = patternRestriction.getPatternList().listIterator();
+        String pattern1 = patternListIterator.next();
+
+        assertThat(pattern1, is("[a-z]"));
+
+        String pattern2 = patternListIterator.next();
+
+        assertThat(pattern2, is("[A-Z]"));
+
+        String pattern3 = patternListIterator.next();
+
+        assertThat(pattern3, is("[0-9]"));
+
+        String pattern4 = patternListIterator.next();
+
+        assertThat(pattern4, is("[\\n]"));
+    }
+
+    /**
+     * Checks multiple pattern and length restriction in referred type and
+     * typedef.
+     */
+    @Test
+    public void processMultiplePatternAndLengthRestriction()
+            throws IOException, ParserException, DataModelException {
+
+        YangNode node = manager.getDataModel("src/test/resources/MultiplePatternAndLengthRestriction.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat(node instanceof YangModule, is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("hello"));
+        assertThat(leafInfo.getDataType().getDataType(), is(DERIVED));
+
+        assertThat(((YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo()).getReferredTypeDef(),
+                is((YangTypeDef) node.getChild()));
+
+        assertThat(leafInfo.getDataType().getResolvableStatus(), is(RESOLVED));
+
+        YangDerivedInfo<?> derivedInfo = (YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo();
+
+        // Check for the effective built-in type.
+        assertThat(derivedInfo.getEffectiveBuiltInType(), is(STRING));
+
+        // Check for the restriction.
+        assertThat(derivedInfo.getLengthRestrictionString(), is(notNullValue()));
+        assertThat(derivedInfo.getRangeRestrictionString(), is(nullValue()));
+        assertThat(derivedInfo.getPatternRestriction(), is(notNullValue()));
+        assertThat(derivedInfo.getResolvedExtendedInfo(), is(notNullValue()));
+
+        // Check for the restriction value.
+        YangStringRestriction stringRestriction = (YangStringRestriction) derivedInfo.getResolvedExtendedInfo();
+
+        // Check for pattern restriction.
+        YangPatternRestriction patternRestriction = stringRestriction.getPatternRestriction();
+        ListIterator<String> patternListIterator = patternRestriction.getPatternList().listIterator();
+        String pattern1 = patternListIterator.next();
+
+        assertThat(pattern1, is("[a-z]"));
+
+        String pattern2 = patternListIterator.next();
+
+        assertThat(pattern2, is("[A-Z]"));
+
+        String pattern3 = patternListIterator.next();
+
+        assertThat(pattern3, is("[0-9]"));
+
+        String pattern4 = patternListIterator.next();
+
+        assertThat(pattern4, is("[\\n]"));
+
+        // Check for length restriction.
+        YangRangeRestriction lengthRestriction = stringRestriction.getLengthRestriction();
+        ListIterator<YangRangeInterval> lengthListIterator = lengthRestriction.getAscendingRangeIntervals()
+                .listIterator();
+
+        YangRangeInterval rangeInterval1 = lengthListIterator.next();
+
+        assertThat(((YangUint64) rangeInterval1.getStartValue()).getValue(), is(BigInteger.valueOf(0)));
+        assertThat(((YangUint64) rangeInterval1.getEndValue()).getValue(), is(BigInteger.valueOf(20)));
+
+        YangRangeInterval rangeInterval2 = lengthListIterator.next();
+
+        assertThat(((YangUint64) rangeInterval2.getStartValue()).getValue(), is(BigInteger.valueOf(201)));
+        assertThat(((YangUint64) rangeInterval2.getEndValue()).getValue(), is(BigInteger.valueOf(300)));
+    }
+
+    /**
+     * Checks multiple pattern and length restriction in referred type and
+     * typedef.
+     */
+    @Test
+    public void processMultiplePatternAndLengthRestrictionValid()
+            throws IOException, ParserException, DataModelException {
+
+        YangNode node = manager.getDataModel("src/test/resources/MultiplePatternAndLengthRestrictionValid.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat(node instanceof YangModule, is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("hello"));
+        assertThat(leafInfo.getDataType().getDataType(), is(DERIVED));
+
+        assertThat(((YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo()).getReferredTypeDef(),
+                is((YangTypeDef) node.getChild()));
+
+        assertThat(leafInfo.getDataType().getResolvableStatus(), is(RESOLVED));
+
+        YangDerivedInfo<?> derivedInfo = (YangDerivedInfo<?>) leafInfo.getDataType().getDataTypeExtendedInfo();
+
+        // Check for the effective built-in type.
+        assertThat(derivedInfo.getEffectiveBuiltInType(), is(STRING));
+
+        // Check for the restriction.
+        assertThat(derivedInfo.getLengthRestrictionString(), is(notNullValue()));
+        assertThat(derivedInfo.getRangeRestrictionString(), is(nullValue()));
+        assertThat(derivedInfo.getPatternRestriction(), is(notNullValue()));
+        assertThat(derivedInfo.getResolvedExtendedInfo(), is(notNullValue()));
+
+        // Check for the restriction value.
+        YangStringRestriction stringRestriction = (YangStringRestriction) derivedInfo.getResolvedExtendedInfo();
+
+        // Check for pattern restriction.
+        YangPatternRestriction patternRestriction = stringRestriction.getPatternRestriction();
+        ListIterator<String> patternListIterator = patternRestriction.getPatternList().listIterator();
+        String pattern1 = patternListIterator.next();
+
+        assertThat(pattern1, is("[a-z]"));
+
+        String pattern2 = patternListIterator.next();
+
+        assertThat(pattern2, is("[A-Z]"));
+
+        String pattern3 = patternListIterator.next();
+
+        assertThat(pattern3, is("[0-9]"));
+
+        String pattern4 = patternListIterator.next();
+
+        assertThat(pattern4, is("[\\n]"));
+
+        // Check for length restriction.
+        YangRangeRestriction lengthRestriction = stringRestriction.getLengthRestriction();
+        ListIterator<YangRangeInterval> lengthListIterator = lengthRestriction.getAscendingRangeIntervals()
+                .listIterator();
+
+        YangRangeInterval rangeInterval1 = lengthListIterator.next();
+
+        assertThat(((YangUint64) rangeInterval1.getStartValue()).getValue(), is(BigInteger.valueOf(0)));
+        assertThat(((YangUint64) rangeInterval1.getEndValue()).getValue(), is(BigInteger.valueOf(20)));
+
+        YangRangeInterval rangeInterval2 = lengthListIterator.next();
+
+        assertThat(((YangUint64) rangeInterval2.getStartValue()).getValue(), is(BigInteger.valueOf(100)));
+        assertThat(((YangUint64) rangeInterval2.getEndValue()).getValue(),
+                is(new BigInteger("18446744073709551615")));
+    }
+
+    /**
+     * Checks multiple pattern and length restriction in referred type and
+     * typedef invalid scenario.
+     */
+    @Test(expected = LinkerException.class)
+    public void processMultiplePatternAndLengthRestrictionInValid()
+            throws IOException, DataModelException {
+        YangNode node = manager.getDataModel("src/test/resources/MultiplePatternAndLengthRestrictionInValid.yang");
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/CustomExceptionMatcher.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/CustomExceptionMatcher.java
new file mode 100644
index 0000000..44d0c67
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/CustomExceptionMatcher.java
@@ -0,0 +1,65 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl;
+
+import org.hamcrest.Description;
+import org.hamcrest.TypeSafeMatcher;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+
+/**
+ * ExpectedException framework can use the Hamcrest matcher's to test
+ * custom/extended exceptions. This class extends the type safe matcher to
+ * define the custom exception matcher.
+ */
+public final class CustomExceptionMatcher extends TypeSafeMatcher<ParserException> {
+
+    private int actualLine;
+    private final int expectedLine;
+    private int actualCharPosition;
+    private final int expectedCharPosition;
+
+    /**
+     * Customized exception matcher to match error location.
+     *
+     * @param line error line
+     * @param charPosition error character position
+     * @return customized exception matcher to match error location
+     */
+    public static CustomExceptionMatcher errorLocation(int line, int charPosition) {
+        return new CustomExceptionMatcher(line, charPosition);
+    }
+
+    private CustomExceptionMatcher(int expectedLine, int expectedCharPosition) {
+        this.expectedLine = expectedLine;
+        this.expectedCharPosition = expectedCharPosition;
+    }
+
+    @Override
+    protected boolean matchesSafely(final ParserException exception) {
+        actualLine = exception.getLineNumber();
+        actualCharPosition = exception.getCharPositionInLine();
+        return ((actualLine == expectedLine) && (actualCharPosition == expectedCharPosition));
+    }
+
+    @Override
+    public void describeTo(Description description) {
+        description.appendText(" Error reported location ")
+                .appendText("Line " + actualLine + ", " + "CharPosition " + actualCharPosition)
+                .appendText(" instead of expected ")
+                .appendText("Line " + expectedLine + ", " + "CharPosition " + expectedCharPosition);
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/TreeWalkListenerTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/TreeWalkListenerTest.java
new file mode 100644
index 0000000..1056d98
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/TreeWalkListenerTest.java
@@ -0,0 +1,86 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl;
+
+import java.io.IOException;
+
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+
+/**
+ * Test cases for testing tree walk listener functionality.
+ */
+public class TreeWalkListenerTest {
+
+    private final YangUtilsParserManager manager = new YangUtilsParserManager();
+
+    @Rule
+    public ExpectedException thrown = ExpectedException.none();
+
+    /**
+     * Checks whether exception is thrown for ordered statement.
+     */
+    @Test
+    public void processOrderedByStatement() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("YANG file error : \"ordered-by\" is not supported in current version, please check wiki" +
+                " for YANG utils road map.");
+        manager.getDataModel("src/test/resources/OrderedByStatement.yang");
+    }
+
+    /**
+     * Checks whether exception is thrown for anyxml statement.
+     */
+    @Test
+    public void processAnyXmlStatement() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("YANG file error : \"anyxml\" is not supported.");
+        manager.getDataModel("src/test/resources/AnyxmlStatement.yang");
+    }
+
+    /**
+     * Checks whether exception is thrown when extra brace is added in the EOF.
+     */
+    @Test
+    public void processFileWithExtraBrace() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("mismatched input '}' expecting <EOF>");
+        manager.getDataModel("src/test/resources/ProcessFileWithExtraBrace.yang");
+    }
+
+    /**
+     * Checks whether exception is thrown when leaf is given after module ends.
+     */
+    @Test
+    public void processFileWithExtraLeaf() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("mismatched input 'leaf' expecting <EOF>");
+        manager.getDataModel("src/test/resources/ProcessFileWithExtraLeaf.yang");
+    }
+
+    /**
+     * Checks whether exception is thrown when extra brace is added in between the EOF.
+     */
+    @Test
+    public void processFileWithExtraBraceInBetween() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("mismatched input 'container' expecting <EOF>");
+        manager.getDataModel("src/test/resources/ProcessFileWithExtraBraceInBetween.yang");
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/YangUtilsParserManagerTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/YangUtilsParserManagerTest.java
new file mode 100644
index 0000000..9b3effc
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/YangUtilsParserManagerTest.java
@@ -0,0 +1,103 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl;
+
+import org.junit.After;
+import org.junit.Before;
+import org.junit.Test;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+
+import java.io.BufferedWriter;
+import java.io.File;
+import java.io.FileWriter;
+import java.io.IOException;
+
+/**
+ * Test case for testing YANG utils parser manager.
+ */
+public class YangUtilsParserManagerTest {
+
+    YangUtilsParserManager manager = new YangUtilsParserManager();
+    File file;
+    BufferedWriter out;
+
+    @Before
+    public void setUp() throws Exception {
+        file = new File("demo.yang");
+        out = new BufferedWriter(new FileWriter(file));
+    }
+    @After
+    public void tearDown() throws Exception {
+        file.delete();
+    }
+
+    /**
+     * This test case checks whether the null pointer exception is generated
+     * when the input YANG file is null.
+     */
+    @Test(expected = NullPointerException.class)
+    public void getDataModelNullFileTest() throws IOException, ParserException {
+        YangUtilsParserManager manager = new YangUtilsParserManager();
+        YangNode node = manager.getDataModel(null);
+    }
+
+    /**
+     * This test case checks whether the io exception is generated
+     * when the input YANG file is non existent.
+     */
+    @Test(expected = ParserException.class)
+    public void getDataModelNonExistentFileTest() throws IOException, ParserException {
+
+        YangUtilsParserManager manager = new YangUtilsParserManager();
+        YangNode node = manager.getDataModel("nonexistent.yang");
+    }
+
+    /**
+     * This test case checks if the input YANG file is correct no exception
+     * should be generated.
+     */
+    @Test
+    public void getDataModelCorrectFileTest() throws IOException, ParserException {
+
+        out.write("module ONOS {\n");
+        out.write("yang-version 1;\n");
+        out.write("namespace urn:ietf:params:xml:ns:yang:ietf-ospf;\n");
+        out.write("prefix On;\n");
+        out.write("}\n");
+        out.close();
+
+        YangNode node = manager.getDataModel("demo.yang");
+    }
+
+    /**
+     * This test case checks if the input YANG file with wrong YANG constructs
+     * than parser exception should be generated.
+     */
+    @Test(expected = ParserException.class)
+    public void getDataModelIncorrectFileTest() throws IOException, ParserException {
+
+        out.write("module ONOS {\n");
+        out.write("yang-version 1\n");
+        out.write("namespace urn:ietf:params:xml:ns:yang:ietf-ospf;\n");
+        out.write("prefix On;\n");
+        out.write("}\n");
+        out.close();
+
+        YangNode node = manager.getDataModel("demo.yang");
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/AugmentListenerTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/AugmentListenerTest.java
new file mode 100644
index 0000000..3ce2fd0
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/AugmentListenerTest.java
@@ -0,0 +1,69 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import java.io.IOException;
+import java.util.ListIterator;
+
+import org.junit.Test;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangAugment;
+import org.onosproject.yangutils.datamodel.YangLeaf;
+import org.onosproject.yangutils.datamodel.YangNodeIdentifier;
+import org.onosproject.yangutils.datamodel.YangDataTypes;
+import org.onosproject.yangutils.datamodel.YangNodeType;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
+
+import static org.hamcrest.core.Is.is;
+import static org.junit.Assert.assertThat;
+
+/**
+ * Test cases for testing augment listener functionality.
+ */
+public class AugmentListenerTest {
+
+    private final YangUtilsParserManager manager = new YangUtilsParserManager();
+
+    /**
+     * Checks valid augment statement.
+     */
+    @Test
+    public void processValidAugmentStatement() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ValidAugmentStatement.yang");
+
+        assertThat((node instanceof YangModule), is(true));
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        YangAugment yangAugment = (YangAugment) yangNode.getChild();
+        ListIterator<YangNodeIdentifier> nodeIdentifierIterator = yangAugment.getTargetNode().listIterator();
+        YangNodeIdentifier yangNodeIdentifier = nodeIdentifierIterator.next();
+        assertThat(yangNodeIdentifier.getPrefix(), is("if"));
+        assertThat(yangNodeIdentifier.getName(), is("interfaces"));
+
+        ListIterator<YangLeaf> leafIterator = yangAugment.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("ds0ChannelNumber"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("ChannelNumber"));
+        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.DERIVED));
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/BaseFileListenerTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/BaseFileListenerTest.java
new file mode 100644
index 0000000..ee418c2
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/BaseFileListenerTest.java
@@ -0,0 +1,106 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.TreeWalkListener;
+
+/**
+ * Test cases for testing base rule listener functionality.
+ */
+public class BaseFileListenerTest {
+
+    @Rule
+    public ExpectedException thrown = ExpectedException.none();
+
+    /**
+     * Checks for exception if stack of parsable data is not empty at the entry
+     * of yang base rule.
+     */
+    @Test
+    public void processYangFileEntryNonEmptyStack() {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("Internal parser error detected: Invalid holder for yangbase before processing.");
+
+        YangModule tmpModule = new YangModule();
+        TreeWalkListener listener = new TreeWalkListener();
+        listener.getParsedDataStack().push(tmpModule);
+        GeneratedYangParser.YangfileContext ctx = null;
+        BaseFileListener.processYangFileEntry(listener, ctx);
+    }
+
+    /**
+     * Checks that exception shouldn't be generated if stack of parsable data is
+     * empty at the entry of yang base rule.
+     */
+    @Test
+    public void processYangFileEntryEmptyStack() {
+
+        TreeWalkListener listener = new TreeWalkListener();
+        GeneratedYangParser.YangfileContext ctx = null;
+        BaseFileListener.processYangFileEntry(listener, ctx);
+    }
+
+    /**
+     * Checks that exception should be generated if stack of parsable data is
+     * not empty at the exit of yang base rule.
+     */
+    @Test
+    public void processYangFileExitEmptyStack() {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("Internal parser error detected: Missing holder at yangbase after processing.");
+
+        TreeWalkListener listener = new TreeWalkListener();
+        GeneratedYangParser.YangfileContext ctx = null;
+        BaseFileListener.processYangFileExit(listener, ctx);
+    }
+
+    /**
+     * Checks that exception shouldn't be generated if stack of parsable data is
+     * empty at the exit of yang base rule.
+     */
+    @Test
+    public void processYangFileExitNonEmptyStack() {
+
+        TreeWalkListener listener = new TreeWalkListener();
+        GeneratedYangParser.YangfileContext ctx = null;
+        BaseFileListener.processYangFileEntry(listener, ctx);
+    }
+
+    /**
+     * Checks that after popping out the parsable node from stack it should be
+     * empty.
+     */
+    @Test
+    public void processYangFileExitStackErrorExtraEntryTest() {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("Internal parser error detected: Invalid holder for yangbase after processing.");
+
+        YangModule tmpModule = new YangModule();
+        YangModule tmpModule2 = new YangModule();
+        TreeWalkListener listener = new TreeWalkListener();
+        listener.getParsedDataStack().push(tmpModule);
+        listener.getParsedDataStack().push(tmpModule2);
+        GeneratedYangParser.YangfileContext ctx = null;
+        BaseFileListener.processYangFileExit(listener, ctx);
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/BelongstoListenerTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/BelongstoListenerTest.java
new file mode 100644
index 0000000..927a2d6
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/BelongstoListenerTest.java
@@ -0,0 +1,86 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangSubModule;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.CustomExceptionMatcher;
+import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
+
+import java.io.IOException;
+
+import static org.hamcrest.core.Is.is;
+import static org.junit.Assert.assertThat;
+
+/**
+ * Test cases for testing belongsto listener functionality.
+ */
+public class BelongstoListenerTest {
+
+    @Rule
+    public ExpectedException thrown = ExpectedException.none();
+
+    private final YangUtilsParserManager manager = new YangUtilsParserManager();
+
+    /**
+     * Checks if mandatory belongsto parameter "prefix" is not present.
+     */
+    @Test
+    public void processBelongsToWithoutPrefix() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("mismatched input '}' expecting 'prefix'");
+        thrown.expect(CustomExceptionMatcher.errorLocation(4, 0));
+        YangNode node = manager.getDataModel("src/test/resources/BelongsToWithoutPrefix.yang");
+    }
+
+    /**
+     * Checks that prefix must be present only once in belongsto.
+     */
+    @Test
+    public void processBelongsToDualPrefix() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("mismatched input 'prefix' expecting '}'");
+        thrown.expect(CustomExceptionMatcher.errorLocation(5, 0));
+        YangNode node = manager.getDataModel("src/test/resources/BelongsToDualPrefix.yang");
+    }
+
+    /**
+     * Checks if belongsto listener updates the date model tree.
+     */
+    @Test
+    public void processBelongsToWithPrefix() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/BelongsToWithPrefix.yang");
+        YangSubModule yangNode = (YangSubModule) node;
+        assertThat(yangNode.getBelongsTo().getBelongsToModuleName(), is("ONOS"));
+    }
+
+    /**
+     * Checks if mandatory parameter "belongsto" is present.
+     */
+    @Test
+    public void processSubModuleWithoutBelongsTo() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("mismatched input '}' expecting 'belongs-to'");
+        thrown.expect(CustomExceptionMatcher.errorLocation(3, 0));
+        YangNode node = manager.getDataModel("src/test/resources/SubModuleWithoutBelongsTo.yang");
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/BitListenerTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/BitListenerTest.java
new file mode 100644
index 0000000..6487172
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/BitListenerTest.java
@@ -0,0 +1,172 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.core.Is.is;
+import org.junit.Test;
+import org.onosproject.yangutils.datamodel.YangBit;
+import org.onosproject.yangutils.datamodel.YangBits;
+import org.onosproject.yangutils.datamodel.YangDataTypes;
+import org.onosproject.yangutils.datamodel.YangLeaf;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangNodeType;
+import org.onosproject.yangutils.datamodel.YangType;
+import org.onosproject.yangutils.datamodel.YangTypeDef;
+import org.onosproject.yangutils.datamodel.YangUnion;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
+
+import java.io.IOException;
+import java.util.List;
+import java.util.ListIterator;
+import java.util.Set;
+
+/**
+ * Test cases for bit listener.
+ */
+public class BitListenerTest {
+
+    private final YangUtilsParserManager manager = new YangUtilsParserManager();
+
+    /**
+     * Checks bit statement without position.
+     */
+    @Test
+    public void processBitTypeStatement() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/BitTypeStatement.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("mybits"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("bits"));
+        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.BITS));
+        assertThat(((YangBits) leafInfo.getDataType().getDataTypeExtendedInfo()).getBitsName(),
+                is("mybits"));
+
+        Set<YangBit> bitSet = ((YangBits) leafInfo.getDataType().getDataTypeExtendedInfo()).getBitSet();
+        for (YangBit tmp : bitSet) {
+            if (tmp.getBitName().equals("disable-nagle")) {
+                assertThat(tmp.getPosition(), is(0));
+            } else if (tmp.getBitName().equals("auto-sense-speed")) {
+                assertThat(tmp.getPosition(), is(1));
+            } else if (tmp.getBitName().equals("Ten-Mb-only")) {
+                assertThat(tmp.getPosition(), is(2));
+            }
+        }
+    }
+
+    /**
+     * Checks bit statement with typedef.
+     */
+    @Test
+    public void processBitTypedefStatement() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/BitTypedefStatement.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        YangTypeDef typedef = (YangTypeDef) yangNode.getChild();
+        assertThat(typedef.getName(), is("type15"));
+
+        YangType type = typedef.getTypeList().iterator().next();
+        assertThat(type.getDataType(), is(YangDataTypes.BITS));
+        assertThat(type.getDataTypeName(), is("bits"));
+        Set<YangBit> bitSet = ((YangBits) type.getDataTypeExtendedInfo()).getBitSet();
+        for (YangBit tmp : bitSet) {
+            if (tmp.getBitName().equals("disable-nagle")) {
+                assertThat(tmp.getPosition(), is(0));
+            } else if (tmp.getBitName().equals("auto-sense-speed")) {
+                assertThat(tmp.getPosition(), is(1));
+            }
+        }
+    }
+
+    /**
+     * Checks bit statement with union.
+     */
+    @Test
+    public void processBitUnionStatement() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/BitUnionStatement.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("type15"));
+
+        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.UNION));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("union"));
+
+        YangUnion yangUnion = (YangUnion) leafInfo.getDataType().getDataTypeExtendedInfo();
+
+        List<YangType<?>> typeList = yangUnion.getTypeList();
+        ListIterator<YangType<?>> typeListIterator = typeList.listIterator();
+        YangType<?> yangType = typeListIterator.next();
+
+        assertThat(yangType.getDataType(), is(YangDataTypes.BITS));
+        assertThat(yangType.getDataTypeName(), is("bits"));
+        Set<YangBit> bitSet = ((YangBits) yangType.getDataTypeExtendedInfo()).getBitSet();
+        for (YangBit tmp : bitSet) {
+            if (tmp.getBitName().equals("disable-nagle")) {
+                assertThat(tmp.getPosition(), is(0));
+            } else if (tmp.getBitName().equals("auto-sense-speed")) {
+                assertThat(tmp.getPosition(), is(1));
+            }
+        }
+    }
+
+    /**
+     * Checks if enum with same name is not allowed.
+     */
+    @Test(expected = ParserException.class)
+    public void processBitWithDuplicateName() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/BitWithDuplicateName.yang");
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/CaseListenerTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/CaseListenerTest.java
new file mode 100644
index 0000000..675a9e9
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/CaseListenerTest.java
@@ -0,0 +1,205 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.core.Is.is;
+import org.junit.Test;
+import org.onosproject.yangutils.datamodel.YangCase;
+import org.onosproject.yangutils.datamodel.YangChoice;
+import org.onosproject.yangutils.datamodel.YangContainer;
+import org.onosproject.yangutils.datamodel.YangLeaf;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangNodeType;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
+
+import java.io.IOException;
+import java.util.ListIterator;
+
+/**
+ * Test cases for case listener.
+ */
+public class CaseListenerTest {
+
+    private final YangUtilsParserManager manager = new YangUtilsParserManager();
+
+    /**
+     * Checks multiple case statement.
+     */
+    @Test
+    public void processCaseStatement() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/CaseStatement.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        YangContainer yangContainer = (YangContainer) yangNode.getChild();
+        assertThat(yangContainer.getName(), is("food"));
+
+        YangChoice yangChoice = (YangChoice) yangContainer.getChild();
+        assertThat(yangChoice.getName(), is("snack"));
+
+        YangCase yangCase1 = (YangCase) yangChoice.getChild();
+        assertThat(yangCase1.getName(), is("sports-arena"));
+
+        // Check whether leaf properties as set correctly.
+        ListIterator<YangLeaf> leafIterator1 = yangCase1.getListOfLeaf().listIterator();
+        YangLeaf leafInfo1 = leafIterator1.next();
+
+        assertThat(leafInfo1.getName(), is("pretzel"));
+
+        YangCase yangCase2 = (YangCase) yangCase1.getNextSibling();
+        assertThat(yangCase2.getName(), is("late-night"));
+
+        // Check whether leaf properties as set correctly.
+        ListIterator<YangLeaf> leafIterator2 = yangCase2.getListOfLeaf().listIterator();
+        YangLeaf leafInfo2 = leafIterator2.next();
+
+        assertThat(leafInfo2.getName(), is("chocolate"));
+    }
+
+    /**
+     * Checks duplicate case in choice.
+     */
+    @Test(expected = ParserException.class)
+    public void processDuplicateCaseInChoice() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/DuplicateCaseInChoice.yang");
+    }
+
+    /**
+     * Checks duplicate leaf at different hierarchy.
+     */
+    @Test(expected = ParserException.class)
+    public void processDuplicateLeafInHierarchy() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/DuplicateLeafInHierarchy.yang");
+    }
+
+    /**
+     * Checks duplicate leaf in different case within choice.
+     */
+    @Test(expected = ParserException.class)
+    public void processDuplicateLeafInChoice() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/DuplicateLeafInChoice.yang");
+    }
+
+    /**
+     * Checks same case within different choice.
+     */
+    @Test
+    public void processCaseStatementSameEntryDifferentChoice() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/CaseStatementSameEntryDifferentChoice.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        YangContainer yangContainer = (YangContainer) yangNode.getChild();
+        assertThat(yangContainer.getName(), is("food"));
+
+        YangChoice yangChoice = (YangChoice) yangContainer.getChild();
+        assertThat(yangChoice.getName(), is("snack"));
+
+        YangCase yangCase1 = (YangCase) yangChoice.getChild();
+        assertThat(yangCase1.getName(), is("sports-arena"));
+
+        // Check whether leaf properties as set correctly.
+        ListIterator<YangLeaf> leafIterator1 = yangCase1.getListOfLeaf().listIterator();
+        YangLeaf leafInfo1 = leafIterator1.next();
+
+        assertThat(leafInfo1.getName(), is("pretzel"));
+
+        YangChoice yangChoice2 = (YangChoice) yangChoice.getNextSibling();
+        assertThat(yangChoice2.getName(), is("lunch"));
+
+        YangCase yangCase2 = (YangCase) yangChoice2.getChild();
+        assertThat(yangCase2.getName(), is("sports-arena"));
+
+        // Check whether leaf properties as set correctly.
+        ListIterator<YangLeaf> leafIterator2 = yangCase2.getListOfLeaf().listIterator();
+        YangLeaf leafInfo2 = leafIterator2.next();
+
+        assertThat(leafInfo2.getName(), is("chocolate"));
+    }
+
+    /**
+     * Checks case choice hierarchy.
+     */
+    @Test
+    public void processCaseChoiceHierarchy() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/CaseChoiceHierarchy.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        YangContainer yangContainer = (YangContainer) yangNode.getChild();
+        assertThat(yangContainer.getName(), is("food"));
+
+        YangChoice yangChoice1 = (YangChoice) yangContainer.getChild();
+        assertThat(yangChoice1.getName(), is("snack"));
+
+        YangCase yangCase1 = (YangCase) yangChoice1.getChild();
+        assertThat(yangCase1.getName(), is("sports-arena"));
+
+        // Check whether leaf properties as set correctly.
+        ListIterator<YangLeaf> leafIterator1 = yangCase1.getListOfLeaf().listIterator();
+        YangLeaf leafInfo1 = leafIterator1.next();
+
+        assertThat(leafInfo1.getName(), is("pretzel"));
+
+        YangCase yangCase2 = (YangCase) yangCase1.getNextSibling();
+        assertThat(yangCase2.getName(), is("late-night"));
+
+        YangChoice yangChoice2 = (YangChoice) yangCase2.getChild();
+        assertThat(yangChoice2.getName(), is("dinner"));
+
+        YangCase yangCase3 = (YangCase) yangChoice2.getChild();
+        assertThat(yangCase3.getName(), is("late-night"));
+
+        // Check whether leaf properties as set correctly.
+        ListIterator<YangLeaf> leafIterator2 = yangCase3.getListOfLeaf().listIterator();
+        YangLeaf leafInfo2 = leafIterator2.next();
+        assertThat(leafInfo2.getName(), is("beer"));
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/ChoiceListenerTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/ChoiceListenerTest.java
new file mode 100644
index 0000000..9dcf448
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/ChoiceListenerTest.java
@@ -0,0 +1,128 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.core.Is.is;
+import org.junit.Test;
+import org.onosproject.yangutils.datamodel.YangChoice;
+import org.onosproject.yangutils.datamodel.YangContainer;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangNodeType;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
+
+import java.io.IOException;
+
+/**
+ * Test cases for choice listener.
+ */
+public class ChoiceListenerTest {
+
+    private final YangUtilsParserManager manager = new YangUtilsParserManager();
+
+    /**
+     * Checks choice statement without body.
+     */
+    @Test
+    public void processChoiceStatementWithoutBody() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ChoiceStatementWithoutBody.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        YangContainer yangContainer = (YangContainer) yangNode.getChild();
+        assertThat(yangContainer.getName(), is("food"));
+
+        YangChoice yangChoice = (YangChoice) yangContainer.getChild();
+        assertThat(yangChoice.getName(), is("snack"));
+    }
+
+    /**
+     * Checks choice statement with stmt end.
+     */
+    @Test
+    public void processChoiceStatementWithStmtend() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ChoiceStatementWithStmtend.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        YangContainer yangContainer = (YangContainer) yangNode.getChild();
+        assertThat(yangContainer.getName(), is("food"));
+
+        YangChoice yangChoice = (YangChoice) yangContainer.getChild();
+        assertThat(yangChoice.getName(), is("snack"));
+    }
+
+    /**
+     * Checks choice statement duplicate entry.
+     */
+    @Test(expected = ParserException.class)
+    public void processChoiceStatementDuplicateEntry() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ChoiceStatementDuplicateEntry.yang");
+    }
+
+    /**
+     * Checks choice statement with same entry in two different container.
+     */
+    @Test
+    public void processChoiceStatementSameEntryDifferentContainer() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ChoiceStatementSameEntryDifferentContainer.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        YangContainer yangContainer1 = (YangContainer) yangNode.getChild();
+        assertThat(yangContainer1.getName(), is("food1"));
+
+        YangChoice yangChoice1 = (YangChoice) yangContainer1.getChild();
+        assertThat(yangChoice1.getName(), is("snack"));
+
+        YangContainer yangContainer2 = (YangContainer) yangNode.getChild().getNextSibling();
+        assertThat(yangContainer2.getName(), is("food2"));
+
+        YangChoice yangChoice2 = (YangChoice) yangContainer2.getChild();
+        assertThat(yangChoice2.getName(), is("snack"));
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/ConfigListenerTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/ConfigListenerTest.java
new file mode 100644
index 0000000..d129e38
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/ConfigListenerTest.java
@@ -0,0 +1,534 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import java.io.IOException;
+import java.util.ListIterator;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+import org.onosproject.yangutils.datamodel.YangContainer;
+import org.onosproject.yangutils.datamodel.YangDataTypes;
+import org.onosproject.yangutils.datamodel.YangLeaf;
+import org.onosproject.yangutils.datamodel.YangLeafList;
+import org.onosproject.yangutils.datamodel.YangList;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangNodeType;
+import org.onosproject.yangutils.datamodel.YangStatusType;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.core.Is.is;
+
+/**
+ * Test cases for config listener.
+ */
+public class ConfigListenerTest {
+
+    @Rule
+    public ExpectedException thrown = ExpectedException.none();
+
+    private final YangUtilsParserManager manager = new YangUtilsParserManager();
+
+    /**
+     * Checks valid config statement.
+     */
+    @Test
+    public void processConfigTrue() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ConfigTrue.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        // Check whether the Config value is set correctly.
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.isConfig(), is(true));
+    }
+
+    /**
+     * Checks valid config statement.
+     */
+    @Test
+    public void processConfigFalse() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ConfigFalse.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        // Check whether the Config value is set correctly.
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.isConfig(), is(false));
+    }
+
+    /**
+     * Checks invalid config statement and expects parser exception.
+     */
+    @Test
+    public void processConfigWithoutStatementEnd() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("missing ';' at '}'");
+        YangNode node = manager.getDataModel("src/test/resources/ConfigWithoutStatementEnd.yang");
+    }
+
+    /**
+     * Checks invalid config statement and expects parser exception.
+     */
+    @Test
+    public void processConfigInvalidValue() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("YANG file error : config value invalid is not valid.");
+        YangNode node = manager.getDataModel("src/test/resources/ConfigInvalidValue.yang");
+    }
+
+    /**
+     * Checks invalid config statement and expects parser exception.
+     */
+    @Test
+    public void processConfigEmptyValue() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("no viable alternative at input ';'");
+        YangNode node = manager.getDataModel("src/test/resources/ConfigEmptyValue.yang");
+    }
+
+    /**
+     * Checks config statement as sub-statement of module.
+     */
+    @Test
+    public void processModuleSubStatementConfig() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("mismatched input 'config' expecting {'anyxml', 'augment', 'choice', 'contact', "
+                + "'container', 'description', 'extension', 'deviation', 'feature', 'grouping', 'identity', 'import',"
+                + " 'include', 'leaf', 'leaf-list', 'list', 'notification', 'organization', 'reference',"
+                + " 'revision', 'rpc', 'typedef', 'uses', '}'}");
+        YangNode node = manager.getDataModel("src/test/resources/ModuleSubStatementConfig.yang");
+    }
+
+    /**
+     * Checks config statement as sub-statement of container.
+     */
+    @Test
+    public void processContainerSubStatementConfig() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ContainerSubStatementConfig.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        // Check whether the config value is set correctly.
+        YangContainer container = (YangContainer) yangNode.getChild();
+        assertThat(container.getName(), is("valid"));
+        assertThat(container.isConfig(), is(true));
+
+        // Check whether leaf properties as set correctly.
+        ListIterator<YangLeaf> leafIterator = container.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("uint16"));
+        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.UINT16));
+        assertThat(leafInfo.getUnits(), is("\"seconds\""));
+        assertThat(leafInfo.getDescription(), is("\"Interval before a route is declared invalid\""));
+        assertThat(leafInfo.isMandatory(), is(true));
+        assertThat(leafInfo.getStatus(), is(YangStatusType.CURRENT));
+        assertThat(leafInfo.getReference(), is("\"RFC 6020\""));
+    }
+
+    /**
+     * Checks config statement as sub-statement of list.
+     */
+    @Test
+    public void processListSubStatementConfig() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ListSubStatementConfig.yang");
+
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        // Check whether the list is child of module and config value is set.
+        YangList yangList = (YangList) yangNode.getChild();
+        assertThat(yangList.getName(), is("valid"));
+        assertThat(yangList.isConfig(), is(true));
+
+        // Check whether leaf properties as set correctly.
+        ListIterator<YangLeaf> leafIterator = yangList.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("uint16"));
+        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.UINT16));
+        assertThat(leafInfo.getUnits(), is("\"seconds\""));
+        assertThat(leafInfo.getDescription(), is("\"Interval before a route is declared invalid\""));
+        assertThat(leafInfo.isMandatory(), is(true));
+        assertThat(leafInfo.getStatus(), is(YangStatusType.CURRENT));
+        assertThat(leafInfo.getReference(), is("\"RFC 6020\""));
+    }
+
+    /**
+     * Checks valid config statement as sub-statement of leaf-list.
+     */
+    @Test
+    public void processLeafListSubStatementConfig() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/LeafListSubStatementConfig.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeafList> leafListIterator = yangNode.getListOfLeafList().listIterator();
+        YangLeafList leafListInfo = leafListIterator.next();
+
+        // Check whether config value is set correctly.
+        assertThat(leafListInfo.getName(), is("invalid-interval"));
+        assertThat(leafListInfo.isConfig(), is(true));
+    }
+
+    /**
+     * Checks config statement's default Value.
+     */
+    @Test
+    public void processConfigDefaultValue() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ConfigDefaultValue.yang");
+
+        assertThat((node instanceof YangModule), is(true));
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        // Check whether the config value is set correctly.
+        YangContainer container = (YangContainer) yangNode.getChild();
+        assertThat(container.getName(), is("valid"));
+        assertThat(container.isConfig(), is(true));
+
+        // Check whether leaf properties as set correctly.
+        ListIterator<YangLeaf> leafIterator = container.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.isConfig(), is(true));
+    }
+
+    /**
+     * Checks whether exception is throw when node's parent config set to false,
+     * no node underneath it can have config set to true.
+     */
+    @Test
+    public void processConfigFalseParentContainerChildLeafList() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("Internal parser error detected: Unhandled parsed data at container \"valid\" after "
+                + "processing.\nError Information: If a container has \"config\" set to \"false\", no node underneath "
+                + "it can have \"config\" set to \"true\".");
+        YangNode node = manager.getDataModel("src/test/resources/ConfigFalseParentContainerChildLeafList.yang");
+    }
+
+    /**
+     * Checks whether exception is throw when node's parent config set to false,
+     * no node underneath it can have config set to true.
+     */
+    @Test
+    public void processConfigFalseParentContainerChildLeaf() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("Internal parser error detected: Unhandled parsed data at container \"valid\" after "
+                + "processing.\nError Information: If a container has \"config\" set to \"false\", no node underneath "
+                + "it can have \"config\" set to \"true\".");
+        YangNode node = manager.getDataModel("src/test/resources/ConfigFalseParentContainerChildLeaf.yang");
+    }
+
+    /**
+     * Checks whether exception is throw when node's parent config set to false,
+     * no node underneath it can have config set to true.
+     */
+    @Test
+    public void processConfigFalseParentListChildLeafList() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("Internal parser error detected: Unhandled parsed data at list \"valid\" after"
+                + " processing.\nError Information: If a list has \"config\" set to \"false\", no node underneath"
+                + " it can have \"config\" set to \"true\".");
+        YangNode node = manager.getDataModel("src/test/resources/ConfigFalseParentListChildLeafList.yang");
+    }
+
+    /**
+     * Checks whether exception is throw when node's parent config set to false,
+     * no node underneath it can have config set to true.
+     */
+    @Test
+    public void processConfigFalseParentListChildLeaf() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("Internal parser error detected: Unhandled parsed data at list \"valid\" after"
+                + " processing.\nError Information: If a list has \"config\" set to \"false\", no node underneath"
+                + " it can have \"config\" set to \"true\".");
+        YangNode node = manager.getDataModel("src/test/resources/ConfigFalseParentListChildLeaf.yang");
+    }
+
+    /**
+     * Checks when config is not specified, the default is same as the parent's schema node's
+     * config statement's value.
+     */
+    @Test
+    public void processNoConfigContainerSubStatementContainer() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/NoConfigContainerSubStatementContainer.yang");
+
+        assertThat((node instanceof YangModule), is(true));
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        // Check whether the config value is set correctly.
+        YangContainer container = (YangContainer) yangNode.getChild();
+        assertThat(container.getName(), is("hello"));
+        assertThat(container.isConfig(), is(true));
+
+        YangNode containerNode = container.getChild();
+        assertThat(containerNode instanceof YangContainer, is(true));
+        YangContainer childContainer = (YangContainer) containerNode;
+        assertThat(childContainer.getName(), is("valid"));
+        assertThat(childContainer.isConfig(), is(true));
+    }
+
+    /**
+     * Checks when config is not specified, the default is same as the parent's schema node's
+     * config statement's value.
+     */
+    @Test
+    public void processNoConfigContainerSubStatementLeafList() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/NoConfigContainerSubStatementLeafList.yang");
+
+        assertThat((node instanceof YangModule), is(true));
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        // Check whether the config value is set correctly.
+        YangContainer container = (YangContainer) yangNode.getChild();
+        assertThat(container.getName(), is("valid"));
+        assertThat(container.isConfig(), is(true));
+
+        ListIterator<YangLeafList> leafListIterator = container.getListOfLeafList().listIterator();
+        YangLeafList leafListInfo = leafListIterator.next();
+
+        // Check whether config value is set correctly.
+        assertThat(leafListInfo.getName(), is("invalid-interval"));
+        assertThat(leafListInfo.isConfig(), is(true));
+
+    }
+
+    /**
+     * Checks when config is not specified, the default is same as the parent's schema node's
+     * config statement's value.
+     */
+    @Test
+    public void processNoConfigContainerSubStatementLeaf() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/NoConfigContainerSubStatementLeaf.yang");
+
+        assertThat((node instanceof YangModule), is(true));
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        // Check whether the config value is set correctly.
+        YangContainer container = (YangContainer) yangNode.getChild();
+        assertThat(container.getName(), is("valid"));
+        assertThat(container.isConfig(), is(true));
+
+        // Check whether leaf properties as set correctly.
+        ListIterator<YangLeaf> leafIterator = container.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.isConfig(), is(true));
+    }
+
+    /**
+     * Checks when config is not specified, the default is same as the parent's schema node's
+     * config statement's value.
+     */
+    @Test
+    public void processNoConfigContainerSubStatementList() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/NoConfigContainerSubStatementList.yang");
+
+        assertThat((node instanceof YangModule), is(true));
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        // Check whether the config value is set correctly.
+        YangContainer container = (YangContainer) yangNode.getChild();
+        assertThat(container.getName(), is("hello"));
+        assertThat(container.isConfig(), is(true));
+
+        YangNode listNode = container.getChild();
+        assertThat(listNode instanceof YangList, is(true));
+        YangList childList = (YangList) listNode;
+        assertThat(childList.getName(), is("valid"));
+        assertThat(childList.isConfig(), is(true));
+
+    }
+
+    /**
+     * Checks when config is not specified, the default is same as the parent's schema node's
+     * config statement's value.
+     */
+    @Test
+    public void processNoConfigListSubStatementContainer() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/NoConfigListSubStatementContainer.yang");
+
+        assertThat((node instanceof YangModule), is(true));
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        // Check whether the config value is set correctly.
+        YangList list1 = (YangList) yangNode.getChild();
+        assertThat(list1.getName(), is("list1"));
+        assertThat(list1.isConfig(), is(true));
+
+        YangNode containerNode = list1.getChild();
+        assertThat(containerNode instanceof YangContainer, is(true));
+        YangContainer childContainer = (YangContainer) containerNode;
+        assertThat(childContainer.getName(), is("container1"));
+        assertThat(childContainer.isConfig(), is(true));
+    }
+
+    /**
+     * Checks when config is not specified, the default is same as the parent's schema node's
+     * config statement's value.
+     */
+    @Test
+    public void processNoConfigListSubStatementLeafList() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/NoConfigListSubStatementLeafList.yang");
+
+        assertThat((node instanceof YangModule), is(true));
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        // Check whether the config value is set correctly.
+        YangList list1 = (YangList) yangNode.getChild();
+        assertThat(list1.getName(), is("valid"));
+        assertThat(list1.isConfig(), is(true));
+
+        ListIterator<YangLeafList> leafListIterator = list1.getListOfLeafList().listIterator();
+        YangLeafList leafListInfo = leafListIterator.next();
+
+        // Check whether config value is set correctly.
+        assertThat(leafListInfo.getName(), is("invalid-interval"));
+        assertThat(leafListInfo.isConfig(), is(true));
+    }
+
+    /**
+     * Checks when config is not specified, the default is same as the parent's schema node's
+     * config statement's value.
+     */
+    @Test
+    public void processNoConfigListSubStatementLeaf() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/NoConfigListSubStatementLeaf.yang");
+
+        assertThat((node instanceof YangModule), is(true));
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        // Check whether the config value is set correctly.
+        YangList list1 = (YangList) yangNode.getChild();
+        assertThat(list1.getName(), is("valid"));
+        assertThat(list1.isConfig(), is(true));
+
+        // Check whether leaf properties as set correctly.
+        ListIterator<YangLeaf> leafIterator = list1.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.isConfig(), is(true));
+    }
+
+    /**
+     * Checks when config is not specified, the default is same as the parent's schema node's
+     * config statement's value.
+     */
+    @Test
+    public void processNoConfigListSubStatementList() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/NoConfigListSubStatementList.yang");
+
+        assertThat((node instanceof YangModule), is(true));
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        // Check whether the config value is set correctly.
+        YangList list1 = (YangList) yangNode.getChild();
+        assertThat(list1.getName(), is("valid"));
+        assertThat(list1.isConfig(), is(true));
+
+        YangNode listNode = list1.getChild();
+        assertThat(listNode instanceof YangList, is(true));
+        YangList childList = (YangList) listNode;
+        assertThat(childList.getName(), is("list1"));
+        assertThat(childList.isConfig(), is(true));
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/ContactListenerTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/ContactListenerTest.java
new file mode 100644
index 0000000..7c8c5e9
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/ContactListenerTest.java
@@ -0,0 +1,94 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
+
+import java.io.IOException;
+
+import static org.hamcrest.core.Is.is;
+import static org.junit.Assert.assertThat;
+
+/**
+ * Test cases for testing contact listener functionality.
+ */
+public class ContactListenerTest {
+
+    @Rule
+    public ExpectedException thrown = ExpectedException.none();
+
+    private final YangUtilsParserManager manager = new YangUtilsParserManager();
+
+    /**
+     * Checks if contact listener updates the data model tree.
+     */
+    @Test
+    public void processContactValidEntry() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ContactValidEntry.yang");
+
+        // Checks for the contact value in data model tree.
+        assertThat(((YangModule) node).getContact(), is("\"WG List:  <mailto:spring@ietf.org>\nEditor:    "
+                + "Stephane Litkowski\n           " + "<mailto:stephane.litkowski@orange.com>\""));
+    }
+
+    /**
+     * Checks that contact must be present only once.
+     */
+    @Test(expected = ParserException.class)
+    public void processContactDualEntryTest() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ContactDualEntryTest.yang");
+
+    }
+
+    /**
+     * Checks that contact can have a string value without double quotes.
+     */
+    @Test
+    public void processContactWithoutQuotes() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ContactWithoutQuotes.yang");
+
+        // Checks for the contact value in data model tree.
+        assertThat(((YangModule) node).getContact(), is("WG"));
+    }
+
+    /**
+     * Checks if contact is not empty.
+     */
+    @Test(expected = ParserException.class)
+    public void processContactWithEmptyString() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ContactWithEmptyString.yang");
+    }
+
+    /**
+     * Checks that contact must be present after namespace.
+     */
+    @Test(expected = ParserException.class)
+    public void processContactIncorrectOrder() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ContactIncorrectOrder.yang");
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/ContainerListenerTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/ContainerListenerTest.java
new file mode 100644
index 0000000..a149da2
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/ContainerListenerTest.java
@@ -0,0 +1,232 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import java.io.IOException;
+import java.util.ListIterator;
+
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+import org.onosproject.yangutils.datamodel.YangContainer;
+import org.onosproject.yangutils.datamodel.YangDataTypes;
+import org.onosproject.yangutils.datamodel.YangLeaf;
+import org.onosproject.yangutils.datamodel.YangList;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangNodeType;
+import org.onosproject.yangutils.datamodel.YangStatusType;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.core.Is.is;
+
+/**
+ * Test cases for testing container listener.
+ */
+public class ContainerListenerTest {
+
+    @Rule
+    public ExpectedException thrown = ExpectedException.none();
+
+    private final YangUtilsParserManager manager = new YangUtilsParserManager();
+
+    /**
+     * Checks container statement as sub-statement of module.
+     */
+    @Test
+    public void processModuleSubStatementContainer() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ModuleSubStatementContainer.yang");
+
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        // Check whether the container is child of module
+        YangContainer yangContainer = (YangContainer) yangNode.getChild();
+        assertThat(yangContainer.getName(), is("valid"));
+    }
+
+    /**
+     * Checks if container identifier in module is duplicate.
+     */
+    @Test(expected = ParserException.class)
+    public void processModuleDuplicateContainer() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ModuleDuplicateContainer.yang");
+    }
+
+    /**
+     * Checks if container identifier in container is duplicate.
+     */
+    @Test(expected = ParserException.class)
+    public void processContainerDuplicateContainer() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ContainerDuplicateContainer.yang");
+    }
+
+    /**
+     * Checks if container identifier in list is duplicate.
+     */
+    @Test(expected = ParserException.class)
+    public void processListDuplicateContainer() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ListDuplicateContainer.yang");
+    }
+
+    /**
+     * Checks if container identifier collides with list at same level.
+     */
+    @Test(expected = ParserException.class)
+    public void processDuplicateContainerAndList() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/DuplicateContainerAndList.yang");
+    }
+
+    /**
+     * Checks container statement as sub-statement of container.
+     */
+    @Test
+    public void processContainerSubStatementContainer() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ContainerSubStatementContainer.yang");
+
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        // Check whether the container is child of module
+        YangContainer yangContainer = (YangContainer) yangNode.getChild();
+        assertThat(yangContainer.getName(), is("ospf"));
+
+        // Check whether the container is child of container
+        YangContainer yangContainer1 = (YangContainer) yangContainer.getChild();
+        assertThat(yangContainer1.getName(), is("valid"));
+    }
+
+    /**
+     * Checks container statement as sub-statement of list.
+     */
+    @Test
+    public void processListSubStatementContainer() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ListSubStatementContainer.yang");
+
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        // Check whether the list is child of module
+        YangList yangList1 = (YangList) yangNode.getChild();
+        assertThat(yangList1.getName(), is("ospf"));
+
+        ListIterator<String> keyList = yangList1.getKeyList().listIterator();
+        assertThat(keyList.next(), is("process-id"));
+
+        // Check whether the list is child of list
+        YangContainer yangContainer = (YangContainer) yangList1.getChild();
+        assertThat(yangContainer.getName(), is("interface"));
+    }
+
+    /**
+     * Checks container with all its sub-statements.
+     */
+    @Test
+    public void processContainerSubStatements() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ContainerSubStatements.yang");
+
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        // Check whether the container is child of module
+        YangContainer yangContainer = (YangContainer) yangNode.getChild();
+
+        // Check whether container properties as set correctly.
+        assertThat(yangContainer.getName(), is("ospf"));
+
+        assertThat(yangContainer.isConfig(), is(true));
+        assertThat(yangContainer.getPresence(), is("\"ospf logs\""));
+        assertThat(yangContainer.getDescription(), is("\"container description\""));
+        assertThat(yangContainer.getStatus(), is(YangStatusType.CURRENT));
+        assertThat(yangContainer.getReference(), is("\"container reference\""));
+
+        // Check whether leaf properties as set correctly.
+        ListIterator<YangLeaf> leafIterator = yangContainer.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("uint16"));
+        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.UINT16));
+        assertThat(leafInfo.getUnits(), is("\"seconds\""));
+        assertThat(leafInfo.getStatus(), is(YangStatusType.CURRENT));
+        assertThat(leafInfo.getReference(), is("\"RFC 6020\""));
+    }
+
+    /**
+     * Checks cardinality of sub-statements of container.
+     */
+    @Test
+    public void processContainerSubStatementCardinality() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("YANG file error: \"reference\" is defined more than once in \"container valid\".");
+        YangNode node = manager.getDataModel("src/test/resources/ContainerSubStatementCardinality.yang");
+    }
+
+    /**
+     * Checks container as root node.
+     */
+    @Test
+    public void processContainerRootNode() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("no viable alternative at input 'container'");
+        YangNode node = manager.getDataModel("src/test/resources/ContainerRootNode.yang");
+    }
+
+    /**
+     * Checks invalid identifier for container statement.
+     */
+    @Test
+    public void processContainerInvalidIdentifier() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("YANG file error : container name 1valid is not valid.");
+        YangNode node = manager.getDataModel("src/test/resources/ContainerInvalidIdentifier.yang");
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/DefaultListenerTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/DefaultListenerTest.java
new file mode 100644
index 0000000..2aab556
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/DefaultListenerTest.java
@@ -0,0 +1,90 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import java.io.IOException;
+import java.util.ListIterator;
+
+import org.junit.Test;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangLeaf;
+import org.onosproject.yangutils.datamodel.YangChoice;
+import org.onosproject.yangutils.datamodel.YangContainer;
+import org.onosproject.yangutils.datamodel.YangNodeType;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
+
+import static org.hamcrest.core.Is.is;
+import static org.junit.Assert.assertThat;
+
+/**
+ * Test cases for testing default listener functionality.
+ */
+public class DefaultListenerTest {
+
+    private final YangUtilsParserManager manager = new YangUtilsParserManager();
+
+    /**
+     * Checks if default value is set correctly.
+     */
+    @Test
+    public void processLeafSubStatementDefault() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/LeafSubStatementDefault.yang");
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getDefaultValueInString(), is("\"1\""));
+    }
+
+    /**
+     * Checks if default value is set correctly.
+     */
+    @Test
+    public void processChoiceSubStatementDefault() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ChoiceSubStatementDefault.yang");
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        YangContainer yangContainer = (YangContainer) yangNode.getChild();
+        assertThat(yangContainer.getName(), is("food"));
+
+        YangChoice yangChoice = (YangChoice) yangContainer.getChild();
+        assertThat(yangChoice.getName(), is("snack"));
+        assertThat(yangChoice.getDefaultValueInString(), is("\"hello\""));
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/DescriptionListenerTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/DescriptionListenerTest.java
new file mode 100644
index 0000000..c3989a6
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/DescriptionListenerTest.java
@@ -0,0 +1,251 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import java.io.IOException;
+import java.util.ListIterator;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+import org.onosproject.yangutils.datamodel.YangContainer;
+import org.onosproject.yangutils.datamodel.YangDataTypes;
+import org.onosproject.yangutils.datamodel.YangLeaf;
+import org.onosproject.yangutils.datamodel.YangLeafList;
+import org.onosproject.yangutils.datamodel.YangList;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangNodeType;
+import org.onosproject.yangutils.datamodel.YangStatusType;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.core.Is.is;
+
+/**
+ * Test cases for description listener.
+ */
+public class DescriptionListenerTest {
+
+    @Rule
+    public ExpectedException thrown = ExpectedException.none();
+
+    private final YangUtilsParserManager manager = new YangUtilsParserManager();
+
+    /**
+     * Checks valid description statement.
+     */
+    @Test
+    public void processDescriptionValidStatement() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/DescriptionValidStatement.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        // Check whether the description is set correctly.
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getDescription(), is("\"Interval before a route is declared invalid\""));
+    }
+
+    /**
+     * Checks whether exception is thrown for invalid description statement.
+     */
+    @Test
+    public void processDescriptionWithoutStatementEnd() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("extraneous input '}' expecting {';', '+'}");
+        YangNode node = manager.getDataModel("src/test/resources/DescriptionWithoutStatementEnd.yang");
+    }
+
+    /**
+     * Checks valid description statement as sub-statement of module.
+     */
+    @Test
+    public void processModuleSubStatementDescription() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ModuleSubStatementDescription.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        // Check whether the description is set correctly.
+        assertThat(yangNode.getDescription(), is("\"Interval before a route is declared invalid\""));
+    }
+
+    /**
+     * Checks valid description statement as sub-statement of module.
+     */
+    @Test
+    public void processDescriptionEmptyStatement() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/DescriptionEmptyStatement.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        // Check whether the description is set correctly.
+        assertThat(yangNode.getDescription(), is("\"\""));
+    }
+
+    /**
+     * Checks valid description statement as sub-statement of revision.
+     */
+    @Test
+    public void processRevisionSubStatementRevision() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/RevisionSubStatementRevision.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        // Check whether the description is set correctly.
+        assertThat(yangNode.getDescription(), is("\"module description\""));
+        assertThat(yangNode.getRevision().getDescription(), is("\"revision description\""));
+    }
+
+    /**
+     * Checks description statement as sub-statement of container.
+     */
+    @Test
+    public void processContainerSubStatementDescription() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ContainerSubStatementDescription.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        // Check whether the description value is set correctly.
+        YangContainer container = (YangContainer) yangNode.getChild();
+        assertThat(container.getName(), is("valid"));
+        assertThat(container.getDescription(), is("\"container description\""));
+
+        // Check whether leaf properties as set correctly.
+        ListIterator<YangLeaf> leafIterator = container.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("uint16"));
+        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.UINT16));
+        assertThat(leafInfo.getUnits(), is("\"seconds\""));
+        assertThat(leafInfo.getDescription(), is("\"Interval before a route is declared invalid\""));
+        assertThat(leafInfo.isMandatory(), is(true));
+        assertThat(leafInfo.getStatus(), is(YangStatusType.CURRENT));
+        assertThat(leafInfo.getReference(), is("\"RFC 6020\""));
+    }
+
+    /**
+     * Checks description statement as sub-statement of list.
+     */
+    @Test
+    public void processListSubStatementDescription() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ListSubStatementDescription.yang");
+
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        // Check whether the list is child of module and description value is set correctly.
+        YangList yangList = (YangList) yangNode.getChild();
+        assertThat(yangList.getName(), is("valid"));
+        assertThat(yangList.isConfig(), is(true));
+        assertThat(yangList.getDescription(), is("\"list description\""));
+
+        // Check whether leaf properties as set correctly.
+        ListIterator<YangLeaf> leafIterator = yangList.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("uint16"));
+        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.UINT16));
+        assertThat(leafInfo.getUnits(), is("\"seconds\""));
+        assertThat(leafInfo.getDescription(), is("\"Interval before a route is declared invalid\""));
+        assertThat(leafInfo.isMandatory(), is(true));
+        assertThat(leafInfo.getStatus(), is(YangStatusType.CURRENT));
+        assertThat(leafInfo.getReference(), is("\"RFC 6020\""));
+    }
+
+    /**
+     * Checks valid description statement as sub-statement of leaf-list.
+     */
+    @Test
+    public void processLeafListSubStatementDescription() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/LeafListSubStatementDescription.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeafList> leafListIterator = yangNode.getListOfLeafList().listIterator();
+        YangLeafList leafListInfo = leafListIterator.next();
+
+        // Check whether description value is set correctly.
+        assertThat(leafListInfo.getName(), is("invalid-interval"));
+        assertThat(leafListInfo.getDescription(), is("\"Interval before a route is declared invalid\""));
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/EnumListenerTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/EnumListenerTest.java
new file mode 100644
index 0000000..a0bff1b
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/EnumListenerTest.java
@@ -0,0 +1,148 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.core.Is.is;
+
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+import org.onosproject.yangutils.datamodel.YangDataTypes;
+import org.onosproject.yangutils.datamodel.YangEnum;
+import org.onosproject.yangutils.datamodel.YangEnumeration;
+import org.onosproject.yangutils.datamodel.YangLeaf;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangNodeType;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
+
+import java.io.IOException;
+import java.util.Iterator;
+import java.util.ListIterator;
+import java.util.SortedSet;
+
+/**
+ * Test cases for enum listener.
+ */
+public class EnumListenerTest {
+
+    @Rule
+    public ExpectedException thrown = ExpectedException.none();
+
+    private final YangUtilsParserManager manager = new YangUtilsParserManager();
+
+    /**
+     * Checks enum statement without value.
+     */
+    @Test
+    public void processEnumTypeStatement() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/EnumTypeStatement.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("speed"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("enumeration"));
+        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.ENUMERATION));
+        assertThat(((YangEnumeration) leafInfo.getDataType().getDataTypeExtendedInfo()).getName(),
+                is("speed_enum"));
+
+        SortedSet<YangEnum> enumSet = ((YangEnumeration) leafInfo.getDataType().getDataTypeExtendedInfo()).getEnumSet();
+        for (YangEnum tmp : enumSet) {
+            if (tmp.getNamedValue().equals("10m")) {
+                assertThat(tmp.getValue(), is(0));
+            } else if (tmp.getNamedValue().equals("100m")) {
+                assertThat(tmp.getValue(), is(1));
+            } else if (tmp.getNamedValue().equals("auto")) {
+                assertThat(tmp.getValue(), is(2));
+            }
+        }
+    }
+
+    /**
+     * Checks if enum with same name is not allowed.
+     */
+    @Test(expected = ParserException.class)
+    public void processEnumWithDuplicateName() throws IOException, ParserException {
+        YangNode node = manager.getDataModel("src/test/resources/EnumWithDuplicateName.yang");
+    }
+
+    /**
+     * Checks enum boundary value.
+     */
+    @Test
+    public void processEnumBoundaryValue() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("YANG file error : value value 21474836472147483647 is not valid.");
+        YangNode node = manager.getDataModel("src/test/resources/EnumBoundaryValue.yang");
+    }
+
+    /**
+     * Checks whether exception is thrown if value is not specified following max enum value.
+     */
+    @Test
+    public void processEnumMaxNextValue() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("YANG file error : "
+                + "An enum value MUST be specified for enum substatements following the one"
+                + "with the current highest value");
+        YangNode node = manager.getDataModel("src/test/resources/EnumMaxNextValue.yang");
+    }
+
+    /**
+     * Checks enum values stored are sorted.
+     */
+    @Test
+    public void processEnumSorted() throws IOException, ParserException {
+        YangNode node = manager.getDataModel("src/test/resources/EnumSorted.yang");
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("ifType"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("enumeration"));
+        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.ENUMERATION));
+        assertThat(((YangEnumeration) leafInfo.getDataType().getDataTypeExtendedInfo()).getName(),
+                is("ifType_enum"));
+
+        SortedSet<YangEnum> enumSet = ((YangEnumeration) leafInfo.getDataType().getDataTypeExtendedInfo()).getEnumSet();
+        Iterator<YangEnum> enumIterator = enumSet.iterator();
+        assertThat(enumIterator.next().getNamedValue(), is("five"));
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/GroupingListenerTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/GroupingListenerTest.java
new file mode 100644
index 0000000..acd0c8a
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/GroupingListenerTest.java
@@ -0,0 +1,189 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import java.io.IOException;
+import java.util.ListIterator;
+import org.junit.Test;
+import org.onosproject.yangutils.datamodel.YangContainer;
+import org.onosproject.yangutils.datamodel.YangGrouping;
+import org.onosproject.yangutils.datamodel.YangLeaf;
+import org.onosproject.yangutils.datamodel.YangList;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangNodeType;
+import org.onosproject.yangutils.datamodel.YangStatusType;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.core.Is.is;
+
+/**
+ * Test cases for testing grouping listener.
+ */
+public class GroupingListenerTest {
+
+    private final YangUtilsParserManager manager = new YangUtilsParserManager();
+
+    /**
+     * Checks grouping statement inside module.
+     */
+    @Test
+    public void processGroupingInModule() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/GroupingInModule.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        YangGrouping yangGrouping = (YangGrouping) yangNode.getChild();
+        assertThat(yangGrouping.getName(), is("endpoint"));
+
+        ListIterator<YangLeaf> leafIterator = yangGrouping.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("address"));
+    }
+
+    /**
+     * Checks grouping statement inside container.
+     */
+    @Test
+    public void processGroupingInContainer() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/GroupingInContainer.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        YangContainer yangContainer = (YangContainer) yangNode.getChild();
+        assertThat(yangContainer.getName(), is("valid"));
+
+        YangGrouping yangGrouping = (YangGrouping) yangContainer.getChild();
+        assertThat(yangGrouping.getName(), is("endpoint"));
+
+        ListIterator<YangLeaf> leafIterator = yangGrouping.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("address"));
+    }
+
+    /**
+     * Checks grouping statement inside list.
+     */
+    @Test
+    public void processGroupingInList() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/GroupingInList.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        YangList yangList = (YangList) yangNode.getChild();
+        assertThat(yangList.getName(), is("valid"));
+
+        YangGrouping yangGrouping = (YangGrouping) yangList.getChild();
+        assertThat(yangGrouping.getName(), is("endpoint"));
+
+        ListIterator<YangLeaf> leafIterator = yangGrouping.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("address"));
+    }
+
+    /**
+     * Checks grouping with attributes.
+     */
+    @Test
+    public void processGroupingAttributes() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/GroupingAttributes.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        YangList yangList = (YangList) yangNode.getChild();
+        assertThat(yangList.getName(), is("valid"));
+
+        YangGrouping yangGrouping = (YangGrouping) yangList.getChild();
+        assertThat(yangGrouping.getName(), is("endpoint"));
+        assertThat(yangGrouping.getStatus(), is(YangStatusType.CURRENT));
+        assertThat(yangGrouping.getReference(), is("\"RFC 6020\""));
+        assertThat(yangGrouping.getDescription(), is("\"grouping under test\""));
+
+        ListIterator<YangLeaf> leafIterator = yangGrouping.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("address"));
+    }
+
+    /**
+     * Checks duplicate grouping in list.
+     */
+    @Test(expected = ParserException.class)
+    public void processDuplicateGroupingInList() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/DuplicateGroupingInList.yang");
+    }
+
+    /**
+     * Checks duplicate grouping in container.
+     */
+    @Test (expected = ParserException.class)
+    public void processDuplicateGroupingInContainer() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/DuplicateGroupingInContainer.yang");
+    }
+
+    /**
+     * Checks duplicate grouping in module.
+     */
+    @Test (expected = ParserException.class)
+    public void processDuplicateGroupingInModule() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/DuplicateGroupingInModule.yang");
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/ImportListenerTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/ImportListenerTest.java
new file mode 100644
index 0000000..9797e5e
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/ImportListenerTest.java
@@ -0,0 +1,112 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import org.junit.Test;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
+
+import java.io.IOException;
+
+import static org.hamcrest.core.Is.is;
+import static org.junit.Assert.assertThat;
+
+/**
+ * Test cases for testing import listener functionality.
+ */
+public class ImportListenerTest {
+
+    private final YangUtilsParserManager manager = new YangUtilsParserManager();
+
+    /**
+     * Checks if mandatory parameter prefix is present in import.
+     */
+    @Test(expected = ParserException.class)
+    public void processImportWithoutPrefix() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ImportWithoutPrefix.yang");
+    }
+
+    /**
+     * Checks that prefix must be present only once in import.
+     */
+    @Test(expected = ParserException.class)
+    public void processImportWithDualPrefix() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ImportWithDualPrefix.yang");
+    }
+
+    /**
+     * Checks for the correct order of prefix in import.
+     */
+    @Test(expected = ParserException.class)
+    public void processImportInvalidOrder() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ImportInvalidOrder.yang");
+    }
+
+    /**
+     * Checks if import listener updates the data model tree.
+     */
+    @Test
+    public void processImportValidEntry() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ImportValidEntry.yang");
+
+        // Checks for the revision value in data model tree.
+        assertThat(((YangModule) node).getImportList().get(0).getRevision(), is("2015-02-03"));
+        // Checks for the prefix id in data model tree.
+        assertThat(((YangModule) node).getImportList().get(0).getPrefixId(), is("On2"));
+        // Checks for the module name in data model tree.
+        assertThat(((YangModule) node).getImportList().get(0).getModuleName(), is("ietf"));
+    }
+
+    /**
+     * Checks if optional parameter revision is not mandatory in import.
+     */
+    @Test
+    public void processImportWithoutRevision() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ImportWithoutRevision.yang");
+
+        // Checks for the prefix id in data model tree.
+        assertThat(((YangModule) node).getImportList().get(0).getPrefixId(), is("On2"));
+        // Checks for the module name in data model tree.
+        assertThat(((YangModule) node).getImportList().get(0).getModuleName(), is("ietf"));
+    }
+
+    /**
+     * Checks if multiple imports are allowed.
+     */
+    @Test()
+    public void processImportMultipleInstance() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ImportMultipleInstance.yang");
+
+        // Checks for the prefix id in data model tree.
+        assertThat(((YangModule) node).getImportList().get(0).getPrefixId(), is("On2"));
+        // Checks for the module name in data model tree.
+        assertThat(((YangModule) node).getImportList().get(0).getModuleName(), is("ietf"));
+
+        // Checks for the prefix id in data model tree.
+        assertThat(((YangModule) node).getImportList().get(1).getPrefixId(), is("On3"));
+        // Checks for the module name in data model tree.
+        assertThat(((YangModule) node).getImportList().get(1).getModuleName(), is("itut"));
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/IncludeListenerTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/IncludeListenerTest.java
new file mode 100644
index 0000000..452fc89
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/IncludeListenerTest.java
@@ -0,0 +1,124 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import org.junit.Test;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
+
+import java.io.IOException;
+
+import static org.hamcrest.core.Is.is;
+import static org.junit.Assert.assertThat;
+
+/**
+ * Test cases for testing include listener functionality.
+ */
+public class IncludeListenerTest {
+
+    private final YangUtilsParserManager manager = new YangUtilsParserManager();
+
+    /**
+     * Checks if include listener with ; is valid and updates the data
+     * model tree.
+     */
+    @Test
+    public void processIncludeWithStmtend() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/IncludeWithStmtend.yang");
+
+        // Checks for the sub module name in data model tree.
+        assertThat(((YangModule) node).getIncludeList().get(0).getSubModuleName(), is("itut"));
+    }
+
+    /**
+     * Checks if include listener with braces and without revision date is valid
+     * and updates the data model tree.
+     */
+    @Test
+    public void processIncludeWithEmptyBody() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/IncludeWithEmptyBody.yang");
+
+        // Checks for the sub module name in data model tree.
+        assertThat(((YangModule) node).getIncludeList().get(0).getSubModuleName(), is("itut"));
+    }
+
+    /**
+     * Checks if include listener with braces and with revision date is valid
+     * and updates the data model tree.
+     */
+    @Test
+    public void processIncludeWithDate() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/IncludeWithDate.yang");
+
+        // Checks for the sub module name in data model tree.
+        assertThat(((YangModule) node).getIncludeList().get(0).getSubModuleName(), is("itut"));
+        assertThat(((YangModule) node).getIncludeList().get(0).getRevision(), is("2016-02-03"));
+    }
+
+    /**
+     * Checks if include has more than one occurrence.
+     */
+    @Test
+    public void processIncludeMultiInstance() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/IncludeMultiInstance.yang");
+
+        // Checks for the sub module name in data model tree.
+        assertThat(((YangModule) node).getIncludeList().get(0).getSubModuleName(), is("itut"));
+        assertThat(((YangModule) node).getIncludeList().get(0).getRevision(), is("2016-02-03"));
+        assertThat(((YangModule) node).getIncludeList().get(1).getSubModuleName(), is("sdn"));
+        assertThat(((YangModule) node).getIncludeList().get(1).getRevision(), is("2014-02-03"));
+    }
+
+    /**
+     * Checks if include and import can come in any order.
+     */
+    @Test
+    public void processIncludeImportAnyOrder() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/IncludeImportAnyOrder.yang");
+
+        // Checks for the sub module name in data model tree.
+        assertThat(((YangModule) node).getIncludeList().get(0).getSubModuleName(), is("itut"));
+        assertThat(((YangModule) node).getIncludeList().get(0).getRevision(), is("2016-02-03"));
+        assertThat(((YangModule) node).getIncludeList().get(1).getSubModuleName(), is("sdn"));
+        assertThat(((YangModule) node).getIncludeList().get(1).getRevision(), is("2014-02-03"));
+    }
+
+    /**
+     * Checks if syntax of Include is not correct.
+     */
+    @Test(expected = ParserException.class)
+    public void processIncludeInvalidSyntax() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/IncludeInvalidSyntax.yang");
+    }
+
+    /**
+     * Checks if syntax of revision date in Include is not correct.
+     */
+    @Test(expected = ParserException.class)
+    public void processIncludeInvalidDateSyntax() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/IncludeInvalidDateSyntax.yang");
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/InputListenerTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/InputListenerTest.java
new file mode 100644
index 0000000..c85c1d5
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/InputListenerTest.java
@@ -0,0 +1,111 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import java.io.IOException;
+import java.util.ListIterator;
+
+import org.junit.Test;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangNodeType;
+import org.onosproject.yangutils.datamodel.YangRpc;
+import org.onosproject.yangutils.datamodel.YangInput;
+import org.onosproject.yangutils.datamodel.YangLeaf;
+import org.onosproject.yangutils.datamodel.YangList;
+import org.onosproject.yangutils.datamodel.YangContainer;
+import org.onosproject.yangutils.datamodel.YangTypeDef;
+import org.onosproject.yangutils.datamodel.YangStatusType;
+import org.onosproject.yangutils.datamodel.YangDataTypes;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
+
+import static org.hamcrest.core.Is.is;
+import static org.junit.Assert.assertThat;
+
+/**
+ * Test cases for testing Input listener functionality.
+ */
+public class InputListenerTest {
+
+    private final YangUtilsParserManager manager = new YangUtilsParserManager();
+
+    /**
+     * Checks input statements with data definition statements as sub-statements.
+     */
+    @Test
+    public void processInputStatementWithDataDefinition() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/InputStatementWithDataDefinition.yang");
+
+        assertThat((node instanceof YangModule), is(true));
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("rock"));
+
+        YangRpc yangRpc = (YangRpc) yangNode.getChild();
+        assertThat(yangRpc.getName(), is("activate-software-image"));
+
+        YangInput yangInput = (YangInput) yangRpc.getChild();
+        assertThat(yangInput.getName(), is("activate-software-image_input"));
+        ListIterator<YangLeaf> leafIterator = yangInput.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("image-name"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("string"));
+
+        YangList yangList = (YangList) yangInput.getChild();
+        assertThat(yangList.getName(), is("ospf"));
+        assertThat(yangList.getKeyList().contains("invalid-interval"), is(true));
+        assertThat(yangList.isConfig(), is(true));
+        assertThat(yangList.getMaxElements(), is(10));
+        assertThat(yangList.getMinElements(), is(3));
+        leafIterator = yangList.getListOfLeaf().listIterator();
+        leafInfo = leafIterator.next();
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("uint16"));
+
+        YangContainer yangContainer = (YangContainer) yangList.getNextSibling();
+        assertThat(yangContainer.getName(), is("isis"));
+
+        leafIterator = yangContainer.getListOfLeaf().listIterator();
+        leafInfo = leafIterator.next();
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("uint16"));
+    }
+
+    /**
+     * Checks input statements with type-def statement as sub-statements.
+     */
+    @Test
+    public void processInputStatementWithTypedef() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/InputStatementWithTypedef.yang");
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("rock"));
+
+        YangRpc yangRpc = (YangRpc) yangNode.getChild();
+        assertThat(yangRpc.getName(), is("activate-software-image"));
+
+        YangInput yangInput = (YangInput) yangRpc.getChild();
+        assertThat(yangInput.getName(), is("activate-software-image_input"));
+        YangTypeDef typeDef = (YangTypeDef) yangInput.getChild();
+        assertThat(typeDef.getName(), is("my-type"));
+        assertThat(typeDef.getStatus(), is(YangStatusType.DEPRECATED));
+        assertThat(typeDef.getTypeDefBaseType().getDataType(), is(YangDataTypes.INT32));
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/KeyListenerTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/KeyListenerTest.java
new file mode 100644
index 0000000..510b313
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/KeyListenerTest.java
@@ -0,0 +1,264 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import org.junit.Rule;
+import org.junit.Test;
+
+import org.junit.rules.ExpectedException;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangNodeType;
+import org.onosproject.yangutils.datamodel.YangList;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
+
+import java.io.IOException;
+import java.util.List;
+import java.util.ListIterator;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.core.Is.is;
+
+/**
+ * Test cases for key listener.
+ */
+public class KeyListenerTest {
+
+    @Rule
+    public ExpectedException thrown = ExpectedException.none();
+
+    private final YangUtilsParserManager manager = new YangUtilsParserManager();
+
+    /**
+     * Checks key statement as sub-statement of list.
+     */
+    @Test
+    public void processListSubStatementKey() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ListSubStatementKey.yang");
+
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        // Check whether the list is child of module
+        YangList yangList = (YangList) yangNode.getChild();
+        assertThat(yangList.getName(), is("valid"));
+
+        ListIterator<String> keyList = yangList.getKeyList().listIterator();
+        assertThat(keyList.next(), is("invalid-interval"));
+    }
+
+    /**
+     * Check multiple key values.
+     */
+    @Test
+    public void processMultipleKeyValues() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/MultipleKeyValues.yang");
+
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        // Check whether the list is child of module
+        YangList yangList = (YangList) yangNode.getChild();
+        assertThat(yangList.getName(), is("valid"));
+
+        List<String> keyList = yangList.getKeyList();
+        assertThat(keyList.contains("ospf"), is(true));
+        assertThat(keyList.contains("isis"), is(true));
+    }
+
+    /**
+     * Checks key statement without statement end.
+     */
+    @Test
+    public void processKeyWithoutStatementEnd() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("mismatched input 'leaf' expecting {';', '+'}");
+        YangNode node = manager.getDataModel("src/test/resources/KeyWithoutStatementEnd.yang");
+    }
+
+    /**
+     * Checks key values are set correctly.
+     */
+    @Test
+    public void processConfigFalseNoKey() throws IOException, ParserException {
+        YangNode node = manager.getDataModel("src/test/resources/ConfigFalseNoKey.yang");
+
+        assertThat((node instanceof YangModule), is(true));
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        // Check whether the list is child of module
+        YangList yangList = (YangList) yangNode.getChild();
+        assertThat(yangList.getName(), is("valid"));
+    }
+
+    /**
+     * Checks key values are set correctly.
+     */
+    @Test
+    public void processConfigFalseValidKeyValidLeaf() throws IOException, ParserException {
+        YangNode node = manager.getDataModel("src/test/resources/ConfigFalseValidKeyValidLeaf.yang");
+
+        assertThat((node instanceof YangModule), is(true));
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        // Check whether the list is child of module
+        YangList yangList = (YangList) yangNode.getChild();
+        assertThat(yangList.getName(), is("valid"));
+
+        ListIterator<String> keyList = yangList.getKeyList().listIterator();
+        assertThat(keyList.next(), is("invalid-interval"));
+    }
+
+    /**
+     * Checks key values are set correctly.
+     */
+    @Test
+    public void processConfigFalseValidKeyValidLeafList() throws IOException, ParserException {
+        YangNode node = manager.getDataModel("src/test/resources/ConfigFalseValidKeyValidLeafList.yang");
+
+        assertThat((node instanceof YangModule), is(true));
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        // Check whether the list is child of module
+        YangList yangList = (YangList) yangNode.getChild();
+        assertThat(yangList.getName(), is("valid"));
+
+        ListIterator<String> keyList = yangList.getKeyList().listIterator();
+        assertThat(keyList.next(), is("invalid-interval"));
+    }
+
+    /**
+     * Checks whether exception is thrown when list's config is set to true and there is no key.
+     */
+    @Test
+    public void processConfigTrueNoKey() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("A list must have atleast one key leaf if config is true");
+        YangNode node = manager.getDataModel("src/test/resources/ConfigTrueNoKey.yang");
+    }
+
+    /**
+     * Checks whether exception is thrown when list's config is set to true and there is no leaf.
+     */
+    @Test
+    public void processConfigTrueNoleafNoLeafList() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("A list must have atleast one key leaf if config is true");
+        YangNode node = manager.getDataModel("src/test/resources/ConfigTrueNoleafNoLeafList.yang");
+    }
+
+    /**
+     * Checks key values are set correctly.
+     */
+    @Test
+    public void processConfigTrueValidKeyValidLeaf() throws IOException, ParserException {
+        YangNode node = manager.getDataModel("src/test/resources/ConfigTrueValidKeyValidLeaf.yang");
+
+        assertThat((node instanceof YangModule), is(true));
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        // Check whether the list is child of module
+        YangList yangList = (YangList) yangNode.getChild();
+        assertThat(yangList.getName(), is("valid"));
+
+        ListIterator<String> keyList = yangList.getKeyList().listIterator();
+        assertThat(keyList.next(), is("invalid-interval"));
+    }
+
+    /**
+     * Checks key values are set correctly.
+     */
+    @Test
+    public void processKeyWithUsesInList() throws IOException, ParserException {
+        YangNode node = manager.getDataModel("src/test/resources/KeyWithUsesInList.yang");
+
+        assertThat((node instanceof YangModule), is(true));
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        // Check whether the list is child of module
+        YangList yangList = (YangList) yangNode.getChild().getNextSibling();
+        assertThat(yangList.getName(), is("valid"));
+
+        ListIterator<String> keyList = yangList.getKeyList().listIterator();
+        assertThat(keyList.next(), is("invalid-interval"));
+    }
+
+    /**
+     * Checks whether exception is thrown when key leaf identifier is not found in list.
+     */
+    @Test
+    public void processInvalidLeafIdentifier() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("An identifier, in key, must refer to a child leaf of the list");
+        YangNode node = manager.getDataModel("src/test/resources/InvalidLeafIdentifier.yang");
+    }
+
+    /**
+     * Checks whether exception is thrown when key leaf-list identifier is not found in list.
+     */
+    @Test
+    public void processInvalidLeafListIdentifier() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("An identifier, in key, must refer to a child leaf of the list");
+        YangNode node = manager.getDataModel("src/test/resources/InvalidLeafListIdentifier.yang");
+    }
+
+    /**
+     * Checks whether exception is thrown when key leaf-list is of type empty.
+     */
+    @Test
+    public void processKeyLeafListTypeEmpty() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("A leaf-list that is part of the key must not be the built-in type \"empty\".");
+        YangNode node = manager.getDataModel("src/test/resources/KeyLeafListTypeEmpty.yang");
+    }
+
+    /**
+     * Checks whether exception is thrown when key leaf is of type empty.
+     */
+    @Test
+    public void processKeyLeafTypeEmpty() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("A leaf that is part of the key must not be the built-in type \"empty\".");
+        YangNode node = manager.getDataModel("src/test/resources/KeyLeafTypeEmpty.yang");
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/LeafListListenerTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/LeafListListenerTest.java
new file mode 100644
index 0000000..8e7489b
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/LeafListListenerTest.java
@@ -0,0 +1,211 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import java.io.IOException;
+import java.util.ListIterator;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+import org.onosproject.yangutils.datamodel.YangContainer;
+import org.onosproject.yangutils.datamodel.YangDataTypes;
+import org.onosproject.yangutils.datamodel.YangLeafList;
+import org.onosproject.yangutils.datamodel.YangList;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangNodeType;
+import org.onosproject.yangutils.datamodel.YangStatusType;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.core.Is.is;
+
+/**
+ * Test cases for testing leaf-list listener.
+ */
+public class LeafListListenerTest {
+
+    @Rule
+    public ExpectedException thrown = ExpectedException.none();
+
+    private final YangUtilsParserManager manager = new YangUtilsParserManager();
+
+    /**
+     * Checks all the values of leaf-list sub-statements are set correctly.
+     */
+    @Test
+    public void processLeafListSubStatements() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/LeafListSubStatements.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeafList> leafListIterator = yangNode.getListOfLeafList().listIterator();
+        YangLeafList leafListInfo = leafListIterator.next();
+
+        assertThat(leafListInfo.getName(), is("invalid-interval"));
+        assertThat(leafListInfo.getDataType().getDataTypeName(), is("uint16"));
+        assertThat(leafListInfo.getDataType().getDataType(), is(YangDataTypes.UINT16));
+        assertThat(leafListInfo.getUnits(), is("\"seconds\""));
+        assertThat(leafListInfo.getDescription(), is("\"Interval before a route is declared invalid\""));
+        assertThat(leafListInfo.isConfig(), is(true));
+        assertThat(leafListInfo.getMaxElelements(), is(3));
+        assertThat(leafListInfo.getStatus(), is(YangStatusType.CURRENT));
+        assertThat(leafListInfo.getReference(), is("\"RFC 6020\""));
+    }
+
+    /**
+     * Checks whether exception is thrown when leaf-list identifier starts with
+     * digit.
+     */
+    @Test
+    public void processLeafListInvalidIdentifier() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("YANG file error : leaf-list name 1invalid-interval is not valid.");
+        YangNode node = manager.getDataModel("src/test/resources/LeafListInvalidIdentifier.yang");
+    }
+
+    /**
+     * Checks whether exception is thrown when leaf-list keyword is incorrect.
+     */
+    @Test
+    public void processLeafListInvalidStatement() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("mismatched input 'leaflist' expecting {'anyxml', 'augment', 'choice', 'contact', "
+                + "'container', 'description', 'extension', 'deviation', 'feature', 'grouping', 'identity', 'import',"
+                + " 'include', 'leaf', 'leaf-list', 'list', 'notification', 'organization', 'reference',"
+                + " 'revision', 'rpc', 'typedef', 'uses', '}'}");
+        YangNode node = manager.getDataModel("src/test/resources/LeafListInvalidStatement.yang");
+    }
+
+    /**
+     * Checks whether exception is thrown when leaf-list keyword without Left
+     * brace as per grammar.
+     */
+    @Test
+    public void processLeafListWithoutLeftBrace() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("missing '{' at 'type'");
+        YangNode node = manager.getDataModel("src/test/resources/LeafListWithoutLeftBrace.yang");
+    }
+
+    /**
+     * Checks whether exception is thrown when config statement cardinality is
+     * not as per grammar.
+     */
+    @Test
+    public void processLeafListConfigInvalidCardinality() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("YANG file error: \"config\" is defined more than once in \"leaf-list " +
+                "invalid-interval\".");
+        YangNode node = manager.getDataModel("src/test/resources/LeafListConfigInvalidCardinality.yang");
+    }
+
+    /**
+     * Checks whether exception is thrown when units statement cardinality is
+     * not as per grammar.
+     */
+    @Test
+    public void processLeafListUnitsInvalidCardinality() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("YANG file error: \"units\" is defined more than once in \"leaf-list invalid-interval\"");
+        YangNode node = manager.getDataModel("src/test/resources/LeafListUnitsInvalidCardinality.yang");
+    }
+
+    /**
+     * Checks leaf-list statement as sub-statement of container.
+     */
+    @Test
+    public void processContainerSubStatementLeafList() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ContainerSubStatementLeafList.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        //Check whether the container is child of module.
+        YangContainer container = (YangContainer) yangNode.getChild();
+        assertThat(container.getName(), is("valid"));
+
+        // Check whether leaf-list properties as set correctly.
+        ListIterator<YangLeafList> leafListIterator = container.getListOfLeafList().listIterator();
+        YangLeafList leafListInfo = leafListIterator.next();
+
+        assertThat(leafListInfo.getName(), is("invalid-interval"));
+        assertThat(leafListInfo.getDataType().getDataTypeName(), is("uint16"));
+        assertThat(leafListInfo.getDataType().getDataType(), is(YangDataTypes.UINT16));
+        assertThat(leafListInfo.getUnits(), is("\"seconds\""));
+        assertThat(leafListInfo.getDescription(), is("\"Interval before a route is declared invalid\""));
+        assertThat(leafListInfo.isConfig(), is(true));
+        assertThat(leafListInfo.getMinElements(), is(1));
+        assertThat(leafListInfo.getMaxElelements(), is(2147483647));
+        assertThat(leafListInfo.getStatus(), is(YangStatusType.CURRENT));
+        assertThat(leafListInfo.getReference(), is("\"RFC 6020\""));
+    }
+
+    /**
+     * Checks leaf-list statement as sub-statement of list.
+     */
+    @Test
+    public void processListSubStatementLeafList() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ListSubStatementLeafList.yang");
+
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        // Check whether the list is child of module
+        YangList yangList = (YangList) yangNode.getChild();
+        assertThat(yangList.getName(), is("valid"));
+
+        // Check whether leaf-list properties as set correctly.
+        ListIterator<YangLeafList> leafListIterator = yangList.getListOfLeafList().listIterator();
+        YangLeafList leafListInfo = leafListIterator.next();
+
+        assertThat(leafListInfo.getName(), is("invalid-interval"));
+        assertThat(leafListInfo.getDataType().getDataTypeName(), is("uint16"));
+        assertThat(leafListInfo.getDataType().getDataType(), is(YangDataTypes.UINT16));
+        assertThat(leafListInfo.getUnits(), is("\"seconds\""));
+        assertThat(leafListInfo.getDescription(), is("\"Interval before a route is declared invalid\""));
+        assertThat(leafListInfo.isConfig(), is(true));
+
+        assertThat(leafListInfo.getStatus(), is(YangStatusType.CURRENT));
+        assertThat(leafListInfo.getReference(), is("\"RFC 6020\""));
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/LeafListenerTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/LeafListenerTest.java
new file mode 100644
index 0000000..b330e53
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/LeafListenerTest.java
@@ -0,0 +1,237 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import java.io.IOException;
+import java.util.ListIterator;
+
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+import org.onosproject.yangutils.datamodel.YangContainer;
+import org.onosproject.yangutils.datamodel.YangDataTypes;
+import org.onosproject.yangutils.datamodel.YangLeaf;
+import org.onosproject.yangutils.datamodel.YangList;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangNodeType;
+import org.onosproject.yangutils.datamodel.YangStatusType;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.core.Is.is;
+
+/**
+ * Test cases for testing leaf listener.
+ */
+public class LeafListenerTest {
+
+    @Rule
+    public ExpectedException thrown = ExpectedException.none();
+
+    private final YangUtilsParserManager manager = new YangUtilsParserManager();
+
+    /**
+     * Checks all the values of leaf sub-statements are set correctly.
+     */
+    @Test
+    public void processLeafSubStatements() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/LeafSubStatements.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("uint16"));
+        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.UINT16));
+        assertThat(leafInfo.getUnits(), is("\"seconds\""));
+        assertThat(leafInfo.getDescription(), is("\"Interval before a route is declared invalid\""));
+        assertThat(leafInfo.isConfig(), is(true));
+        assertThat(leafInfo.isMandatory(), is(true));
+        assertThat(leafInfo.getStatus(), is(YangStatusType.CURRENT));
+        assertThat(leafInfo.getReference(), is("\"RFC 6020\""));
+    }
+
+    /**
+     * Checks whether exception is thrown when leaf identifier starts with
+     * digit.
+     */
+    @Test
+    public void processLeafInvalidIdentifier() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("YANG file error : leaf name 1invalid-interval is not valid.");
+        YangNode node = manager.getDataModel("src/test/resources/LeafInvalidIdentifier.yang");
+    }
+
+    /**
+     * Checks whether exception is thrown when leaf keyword is incorrect.
+     */
+    @Test
+    public void processLeafInvalidStatement() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("mismatched input 'leafs' expecting {'anyxml', 'augment', 'choice', 'contact', "
+                + "'container', 'description', 'extension', 'deviation', 'feature', 'grouping', 'identity', 'import',"
+                + " 'include', 'leaf', 'leaf-list', 'list', 'notification', 'organization', 'reference',"
+                + " 'revision', 'rpc', 'typedef', 'uses', '}'}");
+        YangNode node = manager.getDataModel("src/test/resources/LeafInvalidStatement.yang");
+    }
+
+    /**
+     * Checks whether exception is thrown when leaf keyword without Left brace
+     * as per grammar.
+     */
+    @Test
+    public void processLeafWithoutLeftBrace() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("missing '{' at 'type'");
+        YangNode node = manager.getDataModel("src/test/resources/LeafWithoutLeftBrace.yang");
+    }
+
+    /**
+     * Checks whether exception is thrown when config statement cardinality is
+     * not as per grammar.
+     */
+    @Test
+    public void processLeafConfigInvalidCardinality() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("YANG file error: \"config\" is defined more than once in \"leaf invalid-interval\".");
+        YangNode node = manager.getDataModel("src/test/resources/LeafConfigInvalidCardinality.yang");
+    }
+
+    /**
+     * Checks whether exception is thrown when mandatory statement cardinality
+     * is not as per grammar.
+     */
+    @Test
+    public void processLeafMandatoryInvalidCardinality() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("YANG file error: \"mandatory\" is defined more than once in \"leaf invalid-interval\".");
+        YangNode node = manager.getDataModel("src/test/resources/LeafMandatoryInvalidCardinality.yang");
+    }
+
+    /**
+     * Checks leaf statement as sub-statement of container.
+     */
+    @Test
+    public void processContainerSubStatementLeaf() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ContainerSubStatementLeaf.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        //Check whether the container is child of module.
+        YangContainer container = (YangContainer) yangNode.getChild();
+        assertThat(container.getName(), is("valid"));
+
+        // Check whether leaf properties as set correctly.
+        ListIterator<YangLeaf> leafIterator = container.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("uint16"));
+        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.UINT16));
+        assertThat(leafInfo.getUnits(), is("\"seconds\""));
+        assertThat(leafInfo.getDescription(), is("\"Interval before a route is declared invalid\""));
+        assertThat(leafInfo.isConfig(), is(true));
+        assertThat(leafInfo.isMandatory(), is(true));
+        assertThat(leafInfo.getStatus(), is(YangStatusType.CURRENT));
+        assertThat(leafInfo.getReference(), is("\"RFC 6020\""));
+    }
+
+    /**
+     * Checks duplicate leaf statement as sub-statement of module.
+     */
+    @Test(expected = ParserException.class)
+    public void processModuleWithDuplicateLeaf() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ModuleWithDuplicateLeaf.yang");
+    }
+
+    /**
+     * Checks duplicate leaf statement as sub-statement of container.
+     */
+    @Test(expected = ParserException.class)
+    public void processContainerWithDuplicateLeaf() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ContainerWithDuplicateLeaf.yang");
+    }
+
+    /**
+     * Checks duplicate leaf statement as sub-statement of list.
+     */
+    @Test(expected = ParserException.class)
+    public void processListWithDuplicateLeaf() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ListWithDuplicateLeaf.yang");
+    }
+
+    /**
+     * Checks leaf statement as sub-statement of list.
+     */
+    @Test
+    public void processListSubStatementLeaf() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ListSubStatementLeaf.yang");
+
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        // Check whether the list is child of module
+        YangList yangList = (YangList) yangNode.getChild();
+        assertThat(yangList.getName(), is("valid"));
+
+        // Check whether leaf properties as set correctly.
+        ListIterator<YangLeaf> leafIterator = yangList.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("uint16"));
+        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.UINT16));
+        assertThat(leafInfo.getUnits(), is("\"seconds\""));
+        assertThat(leafInfo.getDescription(), is("\"Interval before a route is declared invalid\""));
+        assertThat(leafInfo.isConfig(), is(true));
+        assertThat(leafInfo.isMandatory(), is(true));
+        assertThat(leafInfo.getStatus(), is(YangStatusType.CURRENT));
+        assertThat(leafInfo.getReference(), is("\"RFC 6020\""));
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/LengthRestrictionListenerTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/LengthRestrictionListenerTest.java
new file mode 100644
index 0000000..0c862ba
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/LengthRestrictionListenerTest.java
@@ -0,0 +1,302 @@
+/*
+ * Copyright 2016 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import java.io.IOException;
+import java.math.BigInteger;
+import java.util.ListIterator;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+import org.onosproject.yangutils.datamodel.YangDataTypes;
+import org.onosproject.yangutils.datamodel.YangLeaf;
+import org.onosproject.yangutils.datamodel.YangLeafList;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangNodeType;
+import org.onosproject.yangutils.datamodel.YangRangeInterval;
+import org.onosproject.yangutils.datamodel.YangRangeRestriction;
+import org.onosproject.yangutils.datamodel.YangStringRestriction;
+import org.onosproject.yangutils.datamodel.YangTypeDef;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
+import org.onosproject.yangutils.datamodel.utils.builtindatatype.YangUint64;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.core.Is.is;
+
+/**
+ * Test cases for length restriction listener.
+ */
+public class LengthRestrictionListenerTest {
+
+    @Rule
+    public ExpectedException thrown = ExpectedException.none();
+
+    private final YangUtilsParserManager manager = new YangUtilsParserManager();
+
+    /**
+     * Checks valid length statement as sub-statement of leaf statement.
+     */
+    @Test
+    public void processValidLengthStatement() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ValidLengthStatement.yang");
+
+        assertThat((node instanceof YangModule), is(true));
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("string"));
+        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.STRING));
+        YangStringRestriction stringRestriction = (YangStringRestriction) leafInfo
+                .getDataType().getDataTypeExtendedInfo();
+        YangRangeRestriction lengthRestriction = stringRestriction.getLengthRestriction();
+
+        ListIterator<YangRangeInterval> lengthListIterator = lengthRestriction.getAscendingRangeIntervals()
+                .listIterator();
+
+        YangRangeInterval rangeInterval = lengthListIterator.next();
+
+        assertThat(((YangUint64) rangeInterval.getStartValue()).getValue(), is(BigInteger.valueOf(0)));
+        assertThat(((YangUint64) rangeInterval.getEndValue()).getValue(), is(BigInteger.valueOf(100)));
+    }
+
+    /**
+     * Checks valid length statement as sub-statement of leaf-list.
+     */
+    @Test
+    public void processLengthStatementInsideLeafList() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/LengthStatementInsideLeafList.yang");
+
+        assertThat((node instanceof YangModule), is(true));
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeafList> leafListIterator = yangNode.getListOfLeafList().listIterator();
+        YangLeafList leafListInfo = leafListIterator.next();
+
+        assertThat(leafListInfo.getName(), is("invalid-interval"));
+        assertThat(leafListInfo.getDataType().getDataTypeName(), is("string"));
+        assertThat(leafListInfo.getDataType().getDataType(), is(YangDataTypes.STRING));
+        YangStringRestriction stringRestriction = (YangStringRestriction) leafListInfo
+                .getDataType().getDataTypeExtendedInfo();
+        YangRangeRestriction lengthRestriction = stringRestriction.getLengthRestriction();
+
+        ListIterator<YangRangeInterval> lengthListIterator = lengthRestriction.getAscendingRangeIntervals()
+                .listIterator();
+
+        YangRangeInterval rangeInterval = lengthListIterator.next();
+        assertThat(((YangUint64) rangeInterval.getStartValue()).getValue(), is(BigInteger.valueOf(1)));
+        assertThat(((YangUint64) rangeInterval.getEndValue()).getValue(), is(BigInteger.valueOf(100)));
+    }
+
+    /**
+     * Checks valid length statement as sub-statement of typedef.
+     */
+    @Test
+    public void processLengthStatementInsideTypeDef() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/LengthStatementInsideTypeDef.yang");
+
+        assertThat((node instanceof YangModule), is(true));
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        YangTypeDef typedef = (YangTypeDef) yangNode.getChild();
+        YangStringRestriction stringRestriction = (YangStringRestriction) typedef.getTypeDefBaseType()
+                .getDataTypeExtendedInfo();
+
+        YangRangeRestriction lengthRestriction = stringRestriction.getLengthRestriction();
+        ListIterator<YangRangeInterval> lengthListIterator = lengthRestriction.getAscendingRangeIntervals()
+                .listIterator();
+        YangRangeInterval rangeInterval = lengthListIterator.next();
+        assertThat(((YangUint64) rangeInterval.getStartValue()).getValue(), is(BigInteger.valueOf(1)));
+        assertThat(((YangUint64) rangeInterval.getEndValue()).getValue(), is(BigInteger.valueOf(100)));
+    }
+
+    /**
+     * Checks length statement with invalid type.
+     */
+    @Test
+    public void processLengthWithInvalidType() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("YANG file error : length name \"1..100\" can be used to restrict the built-in type" +
+                " string/binary or types derived from string/binary.");
+        YangNode node = manager.getDataModel("src/test/resources/LengthWithInvalidType.yang");
+    }
+
+    /**
+     * Checks length statement with only start interval.
+     */
+    @Test
+    public void processLengthWithOneInterval() throws IOException, ParserException {
+
+
+        YangNode node = manager.getDataModel("src/test/resources/LengthWithOneInterval.yang");
+
+        assertThat((node instanceof YangModule), is(true));
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeafList> leafListIterator = yangNode.getListOfLeafList().listIterator();
+        YangLeafList leafListInfo = leafListIterator.next();
+
+        assertThat(leafListInfo.getName(), is("invalid-interval"));
+        assertThat(leafListInfo.getDataType().getDataTypeName(), is("string"));
+        assertThat(leafListInfo.getDataType().getDataType(), is(YangDataTypes.STRING));
+        YangStringRestriction stringRestriction = (YangStringRestriction) leafListInfo
+                .getDataType().getDataTypeExtendedInfo();
+        YangRangeRestriction lengthRestriction = stringRestriction.getLengthRestriction();
+
+        ListIterator<YangRangeInterval> lengthListIterator = lengthRestriction.getAscendingRangeIntervals()
+                .listIterator();
+
+        YangRangeInterval rangeInterval = lengthListIterator.next();
+        assertThat(((YangUint64) rangeInterval.getStartValue()).getValue(), is(BigInteger.valueOf(1)));
+        assertThat(((YangUint64) rangeInterval.getEndValue()).getValue(), is(BigInteger.valueOf(1)));
+    }
+
+    /**
+     * Checks length statement with min and max.
+     */
+    @Test
+    public void processLengthWithMinMax() throws IOException, ParserException {
+
+
+        YangNode node = manager.getDataModel("src/test/resources/LengthWithMinMax.yang");
+
+        assertThat((node instanceof YangModule), is(true));
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeafList> leafListIterator = yangNode.getListOfLeafList().listIterator();
+        YangLeafList leafListInfo = leafListIterator.next();
+
+        assertThat(leafListInfo.getName(), is("invalid-interval"));
+        assertThat(leafListInfo.getDataType().getDataTypeName(), is("string"));
+        assertThat(leafListInfo.getDataType().getDataType(), is(YangDataTypes.STRING));
+        YangStringRestriction stringRestriction = (YangStringRestriction) leafListInfo
+                .getDataType().getDataTypeExtendedInfo();
+        YangRangeRestriction lengthRestriction = stringRestriction.getLengthRestriction();
+
+        ListIterator<YangRangeInterval> lengthListIterator = lengthRestriction.getAscendingRangeIntervals()
+                .listIterator();
+
+        YangRangeInterval rangeInterval = lengthListIterator.next();
+        assertThat(((YangUint64) rangeInterval.getStartValue()).getValue(), is(BigInteger.valueOf(0)));
+        assertThat(((YangUint64) rangeInterval.getEndValue()).getValue(), is(new BigInteger("18446744073709551615")));
+    }
+
+    /**
+     * Checks length statement with invalid integer pattern.
+     */
+    @Test
+    public void processLengthWithInvalidIntegerPattern() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("YANG file error : Input value \"a\" is not a valid uint64.");
+        YangNode node = manager.getDataModel("src/test/resources/LengthWithInvalidIntegerPattern.yang");
+    }
+
+    /**
+     * Checks length statement with invalid interval.
+     */
+    @Test
+    public void processLengthWithInvalidInterval() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("YANG file error : 18446744073709551617 is greater than maximum value" +
+                " 18446744073709551615.");
+        YangNode node = manager.getDataModel("src/test/resources/LengthWithInvalidInterval.yang");
+    }
+
+    /**
+     * Checks valid length substatements.
+     */
+    @Test
+    public void processLengthSubStatements() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/LengthSubStatements.yang");
+
+        assertThat((node instanceof YangModule), is(true));
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("string"));
+        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.STRING));
+        YangStringRestriction stringRestriction = (YangStringRestriction) leafInfo
+                .getDataType().getDataTypeExtendedInfo();
+        YangRangeRestriction lengthRestriction = stringRestriction.getLengthRestriction();
+
+        assertThat(lengthRestriction.getDescription(), is("\"length description\""));
+        assertThat(lengthRestriction.getReference(), is("\"length reference\""));
+
+        ListIterator<YangRangeInterval> lengthListIterator = lengthRestriction.getAscendingRangeIntervals()
+                .listIterator();
+
+        YangRangeInterval rangeInterval = lengthListIterator.next();
+
+        assertThat(((YangUint64) rangeInterval.getStartValue()).getValue(), is(BigInteger.valueOf(0)));
+        assertThat(((YangUint64) rangeInterval.getEndValue()).getValue(), is(BigInteger.valueOf(100)));
+    }
+
+    /**
+     * Checks whether space can be allowed when length statement is present.
+     */
+    @Test
+    public void processLengthStatementWithSpace() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/LengthStatementWithSpace.yang");
+
+        assertThat((node instanceof YangModule), is(true));
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("string"));
+        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.STRING));
+        YangStringRestriction stringRestriction = (YangStringRestriction) leafInfo
+                .getDataType().getDataTypeExtendedInfo();
+        YangRangeRestriction lengthRestriction = stringRestriction.getLengthRestriction();
+
+        ListIterator<YangRangeInterval> lengthListIterator = lengthRestriction.getAscendingRangeIntervals()
+                .listIterator();
+
+        YangRangeInterval rangeInterval = lengthListIterator.next();
+
+        assertThat(((YangUint64) rangeInterval.getStartValue()).getValue(), is(BigInteger.valueOf(0)));
+        assertThat(((YangUint64) rangeInterval.getEndValue()).getValue(), is(BigInteger.valueOf(100)));
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/ListListenerTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/ListListenerTest.java
new file mode 100644
index 0000000..526a645
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/ListListenerTest.java
@@ -0,0 +1,211 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import java.io.IOException;
+import java.util.ListIterator;
+
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+import org.onosproject.yangutils.datamodel.YangContainer;
+import org.onosproject.yangutils.datamodel.YangDataTypes;
+import org.onosproject.yangutils.datamodel.YangLeaf;
+import org.onosproject.yangutils.datamodel.YangList;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangNodeType;
+import org.onosproject.yangutils.datamodel.YangStatusType;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.core.Is.is;
+
+/**
+ * Test cases for testing list listener.
+ */
+public class ListListenerTest {
+
+    @Rule
+    public ExpectedException thrown = ExpectedException.none();
+
+    private final YangUtilsParserManager manager = new YangUtilsParserManager();
+
+    /**
+     * Checks list statement as sub-statement of module.
+     */
+    @Test
+    public void processModuleSubStatementList() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ModuleSubStatementList.yang");
+
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        // Check whether the list is child of module
+        YangList yangList = (YangList) yangNode.getChild();
+        assertThat(yangList.getName(), is("valid"));
+
+        ListIterator<String> keyList = yangList.getKeyList().listIterator();
+        assertThat(keyList.next(), is("invalid-interval"));
+    }
+
+    /**
+     * Checks list statement as sub-statement of container.
+     */
+    @Test
+    public void processContainerSubStatementList() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ContainerSubStatementList.yang");
+
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        // Check whether the container is child of module
+        YangContainer yangContainer = (YangContainer) yangNode.getChild();
+        assertThat(yangContainer.getName(), is("ospf"));
+
+        // Check whether the list is child of container
+        YangList yangList = (YangList) yangContainer.getChild();
+        assertThat(yangList.getName(), is("valid"));
+        assertThat(yangList.getKeyList().contains("invalid-interval"), is(true));
+    }
+
+    /**
+     * Checks list statement as sub-statement of list.
+     */
+    @Test
+    public void processListSubStatementList() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ListSubStatementList.yang");
+
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        // Check whether the list is child of module
+        YangList yangList1 = (YangList) yangNode.getChild();
+        assertThat(yangList1.getName(), is("ospf"));
+        assertThat(yangList1.getKeyList().contains("process-id"), is(true));
+
+        // Check whether the list is child of list
+        YangList yangList = (YangList) yangList1.getChild();
+        assertThat(yangList.getName(), is("valid"));
+        assertThat(yangList.getKeyList().contains("invalid-interval"), is(true));
+    }
+
+    /**
+     * Checks list with all its sub-statements.
+     */
+    @Test
+    public void processListSubStatements() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ListSubStatements.yang");
+
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        // Check whether the list is child of module
+        YangList yangList = (YangList) yangNode.getChild();
+
+        // Check whether list properties as set correctly.
+        assertThat(yangList.getName(), is("ospf"));
+        assertThat(yangList.getKeyList().contains("invalid-interval"), is(true));
+
+        assertThat(yangList.isConfig(), is(true));
+        assertThat(yangList.getMaxElements(), is(10));
+        assertThat(yangList.getMinElements(), is(3));
+        assertThat(yangList.getDescription(), is("\"list description\""));
+        assertThat(yangList.getStatus(), is(YangStatusType.CURRENT));
+        assertThat(yangList.getReference(), is("\"list reference\""));
+
+        // Check whether leaf properties as set correctly.
+        ListIterator<YangLeaf> leafIterator = yangList.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("uint16"));
+        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.UINT16));
+        assertThat(leafInfo.getUnits(), is("\"seconds\""));
+        assertThat(leafInfo.getStatus(), is(YangStatusType.CURRENT));
+        assertThat(leafInfo.getReference(), is("\"RFC 6020\""));
+    }
+
+    /**
+     * Checks cardinality of sub-statements of list.
+     */
+    @Test
+    public void processListSubStatementsCardinality() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("YANG file error: \"reference\" is defined more than once in \"list valid\".");
+        YangNode node = manager.getDataModel("src/test/resources/ListSubStatementsCardinality.yang");
+    }
+
+    /**
+     * Checks list statement without child.
+     */
+    @Test
+    public void processListStatementWithoutChild() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("YANG file error: Missing \"data-def-substatements\" in \"list valid\".");
+        YangNode node = manager.getDataModel("src/test/resources/ListStatementWithoutChild.yang");
+    }
+
+    /**
+     * Checks list as root node.
+     */
+    @Test
+    public void processListAsRootNode() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("no viable alternative at input 'list'");
+        YangNode node = manager.getDataModel("src/test/resources/ListAsRootNode.yang");
+    }
+
+    /**
+     * Checks invalid identifier for list statement.
+     */
+    @Test
+    public void processListInvalidIdentifier() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("YANG file error : list name 1valid is not valid.");
+        YangNode node = manager.getDataModel("src/test/resources/ListInvalidIdentifier.yang");
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/MandatoryListenerTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/MandatoryListenerTest.java
new file mode 100644
index 0000000..52e43a9
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/MandatoryListenerTest.java
@@ -0,0 +1,157 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import java.io.IOException;
+import java.util.ListIterator;
+
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+import org.onosproject.yangutils.datamodel.YangLeaf;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangNodeType;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.core.Is.is;
+
+/**
+ * Test case for mandatory listener.
+ */
+public class MandatoryListenerTest {
+
+    @Rule
+    public ExpectedException thrown = ExpectedException.none();
+
+    private final YangUtilsParserManager manager = new YangUtilsParserManager();
+
+    /**
+     * Checks valid mandatory with value true statement.
+     */
+    @Test
+    public void processMandatoryTrue() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/MandatoryTrue.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        // Check whether the mandatory value is set correctly.
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.isMandatory(), is(true));
+    }
+
+    /**
+     * Checks valid mandatory with value false statement.
+     */
+    @Test
+    public void processMandatoryFalse() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/MandatoryFalse.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        // Check whether the mandatory value is set correctly.
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.isMandatory(), is(false));
+    }
+
+    /**
+     * Checks default value of mandatory statement.
+     */
+    @Test
+    public void processMandatoryDefaultValue() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/MandatoryDefaultValue.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        // Check whether the mandatory value is set correctly.
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.isMandatory(), is(false));
+    }
+
+    /**
+     * Checks invalid of mandatory statement and expects exception.
+     */
+    @Test
+    public void processMandatoryEmptyStatement() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("no viable alternative at input ';'");
+        YangNode node = manager.getDataModel("src/test/resources/MandatoryEmptyStatement.yang");
+    }
+
+    /**
+     * Checks invalid mandatory statement(without statement end) and expects
+     * exception.
+     */
+    @Test
+    public void processMandatoryWithoutStatementEnd() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("missing ';' at '}'");
+        YangNode node = manager.getDataModel("src/test/resources/MandatoryWithoutStatementEnd.yang");
+    }
+
+    /**
+     * Checks mandatory statement as sub-statement of module and expects
+     * exception.
+     */
+    @Test
+    public void processModuleSubStatementMandatory() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("mismatched input 'mandatory' expecting {'anyxml', 'augment', 'choice', 'contact',"
+                + " 'container', 'description', 'extension', 'deviation', 'feature', 'grouping', 'identity', 'import',"
+                + " 'include', 'leaf', 'leaf-list', 'list', 'notification', 'organization', 'reference',"
+                + " 'revision', 'rpc', 'typedef', 'uses', '}'}");
+        YangNode node = manager.getDataModel("src/test/resources/ModuleSubStatementMandatory.yang");
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/MaxElementsListenerTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/MaxElementsListenerTest.java
new file mode 100644
index 0000000..aa0cee2
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/MaxElementsListenerTest.java
@@ -0,0 +1,190 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import java.io.IOException;
+import java.util.ListIterator;
+
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+import org.onosproject.yangutils.datamodel.YangLeafList;
+import org.onosproject.yangutils.datamodel.YangList;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangNodeType;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.core.Is.is;
+
+/**
+ * Test cases for testing max-elements listener.
+ */
+public class MaxElementsListenerTest {
+
+    @Rule
+    public ExpectedException thrown = ExpectedException.none();
+
+    private final YangUtilsParserManager manager = new YangUtilsParserManager();
+
+    /**
+     * Checks max-elements as sub-statements of leaf-list.
+     */
+    @Test
+    public void processLeafListSubStatementMaxElements() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/LeafListSubStatementMaxElements.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeafList> leafListIterator = yangNode.getListOfLeafList().listIterator();
+        YangLeafList leafListInfo = leafListIterator.next();
+
+        assertThat(leafListInfo.getName(), is("invalid-interval"));
+        assertThat(leafListInfo.getMaxElelements(), is(3));
+    }
+
+    /**
+     * Checks max-elements as sub-statements of list.
+     */
+    @Test
+    public void processListSubStatementMaxElements() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ListSubStatementMaxElements.yang");
+
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        // Check whether the list is child of module
+        YangList yangList = (YangList) yangNode.getChild();
+        assertThat(yangList.getName(), is("valid"));
+        assertThat(yangList.getMaxElements(), is(3));
+    }
+
+    /**
+     * Checks whether exception is thrown when invalid max-elements keyword is
+     * given as input.
+     */
+    @Test
+    public void processMaxElementsInvalidStatement() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("extraneous input 'max-element' expecting {'config', 'description', 'if-feature',"
+                + " 'max-elements', 'min-elements', 'must', 'ordered-by', 'reference', 'status', 'type', 'units', "
+                + "'when', '}'}");
+        YangNode node = manager.getDataModel("src/test/resources/MaxElementsInvalidStatement.yang");
+    }
+
+    /**
+     * Checks whether exception is thrown when max-elements statement without
+     * statement end is given as input.
+     */
+    @Test
+    public void processMaxElementsWithoutStatementEnd() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("missing ';' at 'description'");
+        YangNode node = manager.getDataModel("src/test/resources/MaxElementsWithoutStatementEnd.yang");
+    }
+
+    /**
+     * Checks whether exception is thrown when max-elements cardinality is not
+     * as per the grammar.
+     */
+    @Test
+    public void processMaxElementsCardinality() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("YANG file error: \"max-elements\" is defined more than once in \"leaf-list " +
+                "invalid-interval\".");
+        YangNode node = manager.getDataModel("src/test/resources/MaxElementsCardinality.yang");
+    }
+
+    /**
+     * Checks unbounded value of max-elements statement.
+     */
+    @Test
+    public void processMaxElementsUnbounded() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/MaxElementsUnbounded.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeafList> leafListIterator = yangNode.getListOfLeafList().listIterator();
+        YangLeafList leafListInfo = leafListIterator.next();
+
+        assertThat(leafListInfo.getName(), is("invalid-interval"));
+        assertThat(leafListInfo.getMaxElelements(), is(2147483647));
+    }
+
+    /**
+     * Checks default value of max-elements statement.
+     */
+    @Test
+    public void processMaxElementsDefaultValue() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/MaxElementsDefaultValue.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeafList> leafListIterator = yangNode.getListOfLeafList().listIterator();
+        YangLeafList leafListInfo = leafListIterator.next();
+
+        assertThat(leafListInfo.getName(), is("invalid-interval"));
+        assertThat(leafListInfo.getMaxElelements(), is(2147483647));
+    }
+
+    /**
+     * Checks whether exception is thrown when invalid min-elements value is
+     * given as input.
+     */
+    @Test
+    public void processMaxElementsMaxValue() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("YANG file error : max-elements value 77777777777777777777777 is not valid.");
+        YangNode node = manager.getDataModel("src/test/resources/MaxElementsMaxValue.yang");
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/MinElementsListenerTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/MinElementsListenerTest.java
new file mode 100644
index 0000000..c2f668b
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/MinElementsListenerTest.java
@@ -0,0 +1,176 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import java.io.IOException;
+import java.util.ListIterator;
+
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+import org.onosproject.yangutils.datamodel.YangLeafList;
+import org.onosproject.yangutils.datamodel.YangList;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangNodeType;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.core.Is.is;
+
+/**
+ * Test cases for testing min-elements listener.
+ */
+public class MinElementsListenerTest {
+
+    @Rule
+    public ExpectedException thrown = ExpectedException.none();
+
+    private final YangUtilsParserManager manager = new YangUtilsParserManager();
+
+    /**
+     * Checks min-elements as sub-statements of leaf-list.
+     */
+    @Test
+    public void processLeafListSubStatementMinElements() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/LeafListSubStatementMinElements.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeafList> leafListIterator = yangNode.getListOfLeafList().listIterator();
+        YangLeafList leafListInfo = leafListIterator.next();
+
+        assertThat(leafListInfo.getName(), is("invalid-interval"));
+        assertThat(leafListInfo.getMinElements(), is(3));
+    }
+
+    /**
+     * Checks min-elements as sub-statements of list.
+     */
+    @Test
+    public void processListSubStatementMinElements() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ListSubStatementMinElements.yang");
+
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        // Check whether the list is child of module
+        YangList yangList = (YangList) yangNode.getChild();
+        assertThat(yangList.getName(), is("valid"));
+        assertThat(yangList.getMinElements(), is(3));
+    }
+
+    /**
+     * Checks whether exception is thrown when invalid min-elements keyword is
+     * given as input.
+     */
+    @Test
+    public void processMinElementsInvalidKeyword() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("extraneous input 'min-element' expecting {'config', 'description', 'if-feature',"
+                + " 'max-elements', 'min-elements', 'must', 'ordered-by', 'reference', 'status', 'type', 'units',"
+                + " 'when', '}'}");
+        YangNode node = manager.getDataModel("src/test/resources/MinElementsInvalidKeyword.yang");
+    }
+
+    /**
+     * Checks whether exception is thrown when invalid min-elements value is
+     * given as input.
+     */
+    @Test
+    public void processMinElementsInvalidValue() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("YANG file error : min-elements value asd is not valid.");
+        YangNode node = manager.getDataModel("src/test/resources/MinElementsInvalidValue.yang");
+    }
+
+    /**
+     * Checks whether exception is thrown when invalid min-elements value is
+     * given as input.
+     */
+    @Test
+    public void processMinElementsMaxValue() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("YANG file error : min-elements value 77777777777777777777777 is not valid.");
+        YangNode node = manager.getDataModel("src/test/resources/MinElementsMaxValue.yang");
+    }
+
+    /**
+     * Checks whether exception is thrown when min-elements statement without
+     * statement end is given as input.
+     */
+    @Test
+    public void processMinElementsWithoutStatementEnd() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("missing ';' at 'description'");
+        YangNode node = manager.getDataModel("src/test/resources/MinElementsWithoutStatementEnd.yang");
+    }
+
+    /**
+     * Checks whether exception is thrown when min-elements cardinality is not
+     * as per the grammar.
+     */
+    @Test
+    public void processMinElementsInvalidCardinality() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("YANG file error: \"min-elements\" is defined more than once in \"leaf-list " +
+                "invalid-interval\".");
+        YangNode node = manager.getDataModel("src/test/resources/MinElementsInvalidCardinality.yang");
+    }
+
+    /**
+     * Checks min-element's default value.
+     */
+    @Test
+    public void processMinElementsDefaultValue() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/MinElementsDefaultValue.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeafList> leafListIterator = yangNode.getListOfLeafList().listIterator();
+        YangLeafList leafListInfo = leafListIterator.next();
+
+        assertThat(leafListInfo.getName(), is("invalid-interval"));
+        assertThat(leafListInfo.getMinElements(), is(0));
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/ModuleListenerTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/ModuleListenerTest.java
new file mode 100644
index 0000000..f77050a
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/ModuleListenerTest.java
@@ -0,0 +1,81 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangNodeType;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
+
+import java.io.IOException;
+
+import static org.hamcrest.core.Is.is;
+import static org.junit.Assert.assertThat;
+
+/**
+ * Test cases for testing module listener functionality.
+ */
+public class ModuleListenerTest {
+
+    private final YangUtilsParserManager manager = new YangUtilsParserManager();
+
+    @Rule
+    public ExpectedException thrown = ExpectedException.none();
+
+    /**
+     * Checks if module listener updates the data model root node.
+     */
+    @Test
+    public void processModuleValidEntry() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ModuleValidEntry.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+    }
+
+    /**
+     * Checks if module name is set correctly.
+     */
+    @Test(expected = ParserException.class)
+    public void processModuleInvalidEntryTest() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ModuleWithInvalidIdentifier.yang");
+    }
+
+    /**
+     * Checks whether exception is thrown when module length is greater than 64 characters.
+     */
+    @Test
+    public void processModuleInvalidIdentifierLength() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("YANG file error : module name Testttttttttttttttttttttttttttttttttttttttttttttttttttt" +
+                "tttttttttt is greater than 64 characters.");
+        YangNode node = manager.getDataModel("src/test/resources/ModuleInvalidIdentifierLength.yang");
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/NamespaceListenerTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/NamespaceListenerTest.java
new file mode 100644
index 0000000..0f35705
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/NamespaceListenerTest.java
@@ -0,0 +1,87 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import org.junit.Test;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
+
+import java.io.IOException;
+
+import static org.hamcrest.core.Is.is;
+import static org.junit.Assert.assertThat;
+
+/**
+ * Test cases for testing namespace listener functionality.
+ */
+public class NamespaceListenerTest {
+
+    private final YangUtilsParserManager manager = new YangUtilsParserManager();
+
+    /**
+     * Checks that value of namespace shouldn't have invalid spaces.
+     */
+    @Test(expected = ParserException.class)
+    public void processNamespaceWithInvalidSpaces() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/NamespaceWithInvalidSpaces.yang");
+    }
+
+    /**
+     * Checks if namespace with double quotes is allowed.
+     */
+    @Test()
+    public void processNamespaceInDoubleQuotes() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/NamespaceInDoubleQuotes.yang");
+
+        // Checks for the version value in data model tree.
+        assertThat(((YangModule) node).getNameSpace().getUri(), is("\"urn:ietf:params:xml:ns:yang:ietf-ospf\""));
+    }
+
+    /**
+     * Checks if namespace without double quotes is allowed.
+     */
+    @Test()
+    public void processNamespaceWithoutQuotes() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/NamespaceWithoutQuotes.yang");
+
+        // Checks for the version value in data model tree.
+        assertThat(((YangModule) node).getNameSpace().getUri(), is("urn:ietf:params:xml:ns:yang:ietf-ospf"));
+    }
+
+    /**
+     * Checks if namespace is present only once.
+     */
+    @Test(expected = ParserException.class)
+    public void processNamespaceDualEntry() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/NamespaceDualEntry.yang");
+    }
+
+    /**
+     * Checks if mandatory parameter namespace is present.
+     */
+    @Test(expected = ParserException.class)
+    public void processNamespaceNoEntryTest() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/NamespaceNoEntryTest.yang");
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/NotificationListenerTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/NotificationListenerTest.java
new file mode 100644
index 0000000..7da2468
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/NotificationListenerTest.java
@@ -0,0 +1,71 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import java.io.IOException;
+import java.util.ListIterator;
+import org.junit.Test;
+import org.onosproject.yangutils.datamodel.YangLeaf;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangNodeType;
+import org.onosproject.yangutils.datamodel.YangNotification;
+import org.onosproject.yangutils.datamodel.YangStatusType;
+import org.onosproject.yangutils.datamodel.YangTypeDef;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
+
+import static org.hamcrest.core.Is.is;
+import static org.junit.Assert.assertThat;
+
+/**
+ * Test cases for testing notification listener functionality.
+ */
+public class NotificationListenerTest {
+
+    private final YangUtilsParserManager manager = new YangUtilsParserManager();
+
+    /**
+     * Checks valid notification statement.
+     */
+    @Test
+    public void processValidNotificationStatement() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ValidNotificationStatement.yang");
+
+        assertThat((node instanceof YangModule), is(true));
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("rock"));
+
+        YangNotification yangNotification = (YangNotification) yangNode.getChild();
+        assertThat(yangNotification.getName(), is("link-failure"));
+        assertThat(yangNotification.getDescription(), is("\"A link failure has been detected\""));
+        assertThat(yangNotification.getStatus(), is(YangStatusType.DEPRECATED));
+        assertThat(yangNotification.getReference(), is("\"reference\""));
+
+        YangTypeDef typeDef = (YangTypeDef) yangNotification.getChild();
+        assertThat(typeDef.getName(), is("my-type"));
+        assertThat(typeDef.getStatus(), is(YangStatusType.DEPRECATED));
+
+        ListIterator<YangLeaf> leafIterator = yangNotification.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("if-name"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("string"));
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/OrganizationListenerTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/OrganizationListenerTest.java
new file mode 100644
index 0000000..e9098d3
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/OrganizationListenerTest.java
@@ -0,0 +1,75 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import org.junit.Test;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
+
+import java.io.IOException;
+
+import static org.hamcrest.core.Is.is;
+import static org.junit.Assert.assertThat;
+
+/**
+ * Test cases for testing organization listener functionality.
+ */
+public class OrganizationListenerTest {
+
+    private final YangUtilsParserManager manager = new YangUtilsParserManager();
+
+    /**
+     * Checks if organization listener updates the data model tree.
+     */
+    @Test
+    public void processOrganizationValidEntry() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/OrganizationValidEntry.yang");
+
+        // Checks for the version value in data model tree.
+        assertThat(((YangModule) node).getOrganization(), is("\"IETF SPRING Working Group\""));
+    }
+
+    /**
+     * Checks that organization must be present only once.
+     */
+    @Test(expected = ParserException.class)
+    public void processOrganizationDualEntry() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/OrganizationDualEntry.yang");
+    }
+
+    /**
+     * Checks if organization entry syntax is correct.
+     */
+    @Test(expected = ParserException.class)
+    public void processOrganizationMissingValue() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/OrganizationMissingValue.yang");
+    }
+
+    /**
+     * Checks if organization and namespace is present in correct order.
+     */
+    @Test(expected = ParserException.class)
+    public void processOrganizationInvalidOrder() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/OrganizationInvalidOrder.yang");
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/OutputListenerTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/OutputListenerTest.java
new file mode 100644
index 0000000..a727092
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/OutputListenerTest.java
@@ -0,0 +1,112 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import java.io.IOException;
+import java.util.ListIterator;
+import org.junit.Test;
+import org.onosproject.yangutils.datamodel.YangContainer;
+import org.onosproject.yangutils.datamodel.YangDataTypes;
+import org.onosproject.yangutils.datamodel.YangLeaf;
+import org.onosproject.yangutils.datamodel.YangList;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangNodeType;
+import org.onosproject.yangutils.datamodel.YangOutput;
+import org.onosproject.yangutils.datamodel.YangRpc;
+import org.onosproject.yangutils.datamodel.YangStatusType;
+import org.onosproject.yangutils.datamodel.YangTypeDef;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
+
+import static org.hamcrest.core.Is.is;
+import static org.junit.Assert.assertThat;
+
+/**
+ * Test cases for testing output listener functionality.
+ */
+public class OutputListenerTest {
+
+    private final YangUtilsParserManager manager = new YangUtilsParserManager();
+
+    /**
+     * Checks output statements with data definition statements as sub-statements.
+     */
+    @Test
+    public void processOutputStatementWithDataDefinition() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/OutputStatementWithDataDefinition.yang");
+
+        assertThat((node instanceof YangModule), is(true));
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("rock"));
+
+        YangRpc yangRpc = (YangRpc) yangNode.getChild();
+        assertThat(yangRpc.getName(), is("activate-software-image"));
+
+        YangOutput yangOutput = (YangOutput) yangRpc.getChild();
+        assertThat(yangOutput.getName(), is("activate-software-image_output"));
+        ListIterator<YangLeaf> leafIterator = yangOutput.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("image-name"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("string"));
+
+        YangList yangList = (YangList) yangOutput.getChild();
+        assertThat(yangList.getName(), is("ospf"));
+        assertThat(yangList.getKeyList().contains("invalid-interval"), is(true));
+        assertThat(yangList.isConfig(), is(true));
+        assertThat(yangList.getMaxElements(), is(10));
+        assertThat(yangList.getMinElements(), is(3));
+        leafIterator = yangList.getListOfLeaf().listIterator();
+        leafInfo = leafIterator.next();
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("uint16"));
+
+        YangContainer yangContainer = (YangContainer) yangList.getNextSibling();
+        assertThat(yangContainer.getName(), is("isis"));
+
+        leafIterator = yangContainer.getListOfLeaf().listIterator();
+        leafInfo = leafIterator.next();
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("uint16"));
+    }
+
+    /**
+     * Checks output statements with type-def statement as sub-statements.
+     */
+    @Test
+    public void processOutputStatementWithTypedef() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/OutputStatementWithTypedef.yang");
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("rock"));
+
+        YangRpc yangRpc = (YangRpc) yangNode.getChild();
+        assertThat(yangRpc.getName(), is("activate-software-image"));
+
+        YangOutput yangOutput = (YangOutput) yangRpc.getChild();
+        assertThat(yangOutput.getName(), is("activate-software-image_output"));
+        YangTypeDef typeDef = (YangTypeDef) yangOutput.getChild();
+        assertThat(typeDef.getName(), is("my-type"));
+        assertThat(typeDef.getStatus(), is(YangStatusType.DEPRECATED));
+        assertThat(typeDef.getName(), is("my-type"));
+        assertThat(typeDef.getStatus(), is(YangStatusType.DEPRECATED));
+        assertThat(typeDef.getTypeDefBaseType().getDataType(), is(YangDataTypes.INT32));
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/PatternRestrictionListenerTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/PatternRestrictionListenerTest.java
new file mode 100644
index 0000000..5216ef3
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/PatternRestrictionListenerTest.java
@@ -0,0 +1,205 @@
+/*
+ * Copyright 2016 Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import java.io.IOException;
+import java.util.ListIterator;
+
+import org.junit.Test;
+import org.onosproject.yangutils.datamodel.YangDataTypes;
+import org.onosproject.yangutils.datamodel.YangLeaf;
+import org.onosproject.yangutils.datamodel.YangLeafList;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangNodeType;
+import org.onosproject.yangutils.datamodel.YangPatternRestriction;
+import org.onosproject.yangutils.datamodel.YangStringRestriction;
+import org.onosproject.yangutils.datamodel.YangTypeDef;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.core.Is.is;
+
+/**
+ * Test cases for pattern restriction listener.
+ */
+public class PatternRestrictionListenerTest {
+
+    private final YangUtilsParserManager manager = new YangUtilsParserManager();
+
+    /**
+     * Checks valid pattern statement as sub-statement of leaf statement.
+     */
+    @Test
+    public void processValidPatternStatement() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ValidPatternStatement.yang");
+
+        assertThat((node instanceof YangModule), is(true));
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("string"));
+        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.STRING));
+        YangStringRestriction stringRestriction = (YangStringRestriction) leafInfo
+                .getDataType().getDataTypeExtendedInfo();
+        ListIterator<String> patternListIterator = stringRestriction.getPatternRestriction()
+                .getPatternList().listIterator();
+        assertThat(patternListIterator.next(), is("[a-zA-Z]"));
+    }
+
+    /**
+     * Checks valid pattern statement as sub-statement of leaf-list.
+     */
+    @Test
+    public void processPatternStatementInsideLeafList() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/PatternStatementInsideLeafList.yang");
+
+        assertThat((node instanceof YangModule), is(true));
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeafList> leafListIterator = yangNode.getListOfLeafList().listIterator();
+        YangLeafList leafListInfo = leafListIterator.next();
+
+        assertThat(leafListInfo.getName(), is("invalid-interval"));
+        assertThat(leafListInfo.getDataType().getDataTypeName(), is("string"));
+        assertThat(leafListInfo.getDataType().getDataType(), is(YangDataTypes.STRING));
+        YangStringRestriction stringRestriction = (YangStringRestriction) leafListInfo
+                .getDataType().getDataTypeExtendedInfo();
+        ListIterator<String> patternListIterator = stringRestriction.getPatternRestriction()
+                .getPatternList().listIterator();
+        assertThat(patternListIterator.next(), is("[a-zA-Z]"));
+    }
+
+    /**
+     * Checks valid pattern statement as sub-statement of typedef.
+     */
+    @Test
+    public void processPatternStatementInsideTypeDef() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/PatternStatementInsideTypeDef.yang");
+
+        assertThat((node instanceof YangModule), is(true));
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        YangTypeDef typedef = (YangTypeDef) yangNode.getChild();
+        YangStringRestriction stringRestriction = (YangStringRestriction) typedef.getTypeDefBaseType()
+                .getDataTypeExtendedInfo();
+
+        YangPatternRestriction yangPatternRestriction = stringRestriction.getPatternRestriction();
+        assertThat(yangPatternRestriction.getPatternList().listIterator().next(), is("[a-zA-Z]"));
+    }
+
+    /**
+     * Checks valid multiple pattern statements.
+     */
+    @Test
+    public void processMultiplePatternStatement() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/MultiplePatternStatement.yang");
+
+        assertThat((node instanceof YangModule), is(true));
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeafList> leafListIterator = yangNode.getListOfLeafList().listIterator();
+        YangLeafList leafListInfo = leafListIterator.next();
+
+        assertThat(leafListInfo.getName(), is("invalid-interval"));
+        assertThat(leafListInfo.getDataType().getDataTypeName(), is("string"));
+        assertThat(leafListInfo.getDataType().getDataType(), is(YangDataTypes.STRING));
+        YangStringRestriction stringRestriction = (YangStringRestriction) leafListInfo
+                .getDataType().getDataTypeExtendedInfo();
+        ListIterator<String> patternListIterator = stringRestriction.getPatternRestriction()
+                .getPatternList().listIterator();
+        assertThat(patternListIterator.next(), is("[a-zA-Z]"));
+    }
+
+    /**
+     * Checks valid pattern statement with plus symbol in pattern.
+     */
+    @Test
+    public void processPatternStatementWithPlus() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/PatternStatementWithPlus.yang");
+
+        assertThat((node instanceof YangModule), is(true));
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeafList> leafListIterator = yangNode.getListOfLeafList().listIterator();
+        YangLeafList leafListInfo = leafListIterator.next();
+
+        assertThat(leafListInfo.getName(), is("invalid-interval"));
+        assertThat(leafListInfo.getDataType().getDataTypeName(), is("string"));
+        assertThat(leafListInfo.getDataType().getDataType(), is(YangDataTypes.STRING));
+        YangStringRestriction stringRestriction = (YangStringRestriction) leafListInfo
+                .getDataType().getDataTypeExtendedInfo();
+        ListIterator<String> patternListIterator = stringRestriction.getPatternRestriction()
+                .getPatternList().listIterator();
+        assertThat(patternListIterator.next(), is("-[0-9]+|[0-9]+"));
+    }
+
+    /**
+     * Checks valid pattern substatement.
+     */
+    @Test
+    public void processPatternSubStatements() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/PatternSubStatements.yang");
+
+        assertThat((node instanceof YangModule), is(true));
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("string"));
+        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.STRING));
+        YangStringRestriction stringRestriction = (YangStringRestriction) leafInfo
+                .getDataType().getDataTypeExtendedInfo();
+        assertThat(stringRestriction.getDescription(), is("\"pattern description\""));
+        assertThat(stringRestriction.getReference(), is("\"pattern reference\""));
+        ListIterator<String> patternListIterator = stringRestriction.getPatternRestriction()
+                .getPatternList().listIterator();
+        assertThat(patternListIterator.next(), is("[a-zA-Z]"));
+    }
+
+    /**
+     * Checks invalid pattern sub-statement.
+     */
+    @Test(expected = ParserException.class)
+    public void processInvalidPatternSubStatements() throws IOException, ParserException {
+        YangNode node = manager.getDataModel("src/test/resources/InvalidPatternSubStatements.yang");
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/PositionListenerTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/PositionListenerTest.java
new file mode 100644
index 0000000..7d252ba
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/PositionListenerTest.java
@@ -0,0 +1,186 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.core.Is.is;
+import org.junit.Test;
+import org.onosproject.yangutils.datamodel.YangBit;
+import org.onosproject.yangutils.datamodel.YangBits;
+import org.onosproject.yangutils.datamodel.YangDataTypes;
+import org.onosproject.yangutils.datamodel.YangLeaf;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangNodeType;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
+
+import java.io.IOException;
+import java.util.ListIterator;
+import java.util.Set;
+
+/**
+ * Test cases for position listener.
+ */
+public class PositionListenerTest {
+
+    private final YangUtilsParserManager manager = new YangUtilsParserManager();
+
+    /**
+     * Checks explicitly configured value.
+     */
+    @Test
+    public void processPositionStatement() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/PositionStatement.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("mybits"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("bits"));
+        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.BITS));
+        assertThat(((YangBits) leafInfo.getDataType().getDataTypeExtendedInfo()).getBitsName(),
+                is("mybits"));
+
+        Set<YangBit> bitSet = ((YangBits) leafInfo.getDataType().getDataTypeExtendedInfo()).getBitSet();
+        for (YangBit tmp : bitSet) {
+            if (tmp.getBitName().equals("disable-nagle")) {
+                assertThat(tmp.getPosition(), is(0));
+            } else if (tmp.getBitName().equals("auto-sense-speed")) {
+                assertThat(tmp.getPosition(), is(1));
+            } else if (tmp.getBitName().equals("Ten-Mb-only")) {
+                assertThat(tmp.getPosition(), is(2));
+            }
+        }
+    }
+
+    /**
+     * Checks position value with double quotes.
+     */
+    @Test
+    public void processPositionWithDoubleQuotes() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/PositionWithDoubleQuotes.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("mybits"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("bits"));
+        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.BITS));
+        assertThat(((YangBits) leafInfo.getDataType().getDataTypeExtendedInfo()).getBitsName(),
+                is("mybits"));
+
+        Set<YangBit> bitSet = ((YangBits) leafInfo.getDataType().getDataTypeExtendedInfo()).getBitSet();
+        for (YangBit tmp : bitSet) {
+            if (tmp.getBitName().equals("disable-nagle")) {
+                assertThat(tmp.getPosition(), is(0));
+            } else if (tmp.getBitName().equals("auto-sense-speed")) {
+                assertThat(tmp.getPosition(), is(1));
+            } else if (tmp.getBitName().equals("Ten-Mb-only")) {
+                assertThat(tmp.getPosition(), is(2));
+            }
+        }
+    }
+
+    /**
+     * Checks explicit value and auto generated value.
+     */
+    @Test
+    public void processPositionImplicitAndExplicit() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/PositionImplicitAndExplicit.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("mybits"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("bits"));
+        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.BITS));
+        assertThat(((YangBits) leafInfo.getDataType().getDataTypeExtendedInfo()).getBitsName(),
+                is("mybits"));
+
+        Set<YangBit> bitSet = ((YangBits) leafInfo.getDataType().getDataTypeExtendedInfo()).getBitSet();
+        for (YangBit tmp : bitSet) {
+            if (tmp.getBitName().equals("disable-nagle")) {
+                assertThat(tmp.getPosition(), is(0));
+            } else if (tmp.getBitName().equals("auto-sense-speed")) {
+                assertThat(tmp.getPosition(), is(1));
+            } else if (tmp.getBitName().equals("Ten-Mb-only")) {
+                assertThat(tmp.getPosition(), is(2));
+            }
+        }
+    }
+
+    /**
+     * Checks explicit value should not be repeated.
+     */
+    @Test(expected = ParserException.class)
+    public void processPositionDuplication() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/PositionDuplication.yang");
+    }
+
+    /**
+     * Checks explicit or auto generated value should not be repeated.
+     */
+    @Test(expected = ParserException.class)
+    public void processPositionImplicitAndExplicitDuplication() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/PositionImplicitAndExplicitDuplication.yang");
+    }
+
+    /**
+     * Checks if negative value of position is not allowed.
+     */
+    @Test(expected = ParserException.class)
+    public void processPositionNegativeValue() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/PositionNegativeValue.yang");
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/PrefixListenerTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/PrefixListenerTest.java
new file mode 100644
index 0000000..ef89a78
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/PrefixListenerTest.java
@@ -0,0 +1,94 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import org.junit.Test;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
+
+import java.io.IOException;
+
+import static org.hamcrest.core.Is.is;
+import static org.junit.Assert.assertThat;
+
+/**
+ * Test cases for testing prefix listener functionality.
+ */
+public class PrefixListenerTest {
+
+    private final YangUtilsParserManager manager = new YangUtilsParserManager();
+
+    /**
+     * Checks if value of prefix is correct.
+     */
+    @Test(expected = ParserException.class)
+    public void processPrefixInvalidValue() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/PrefixInvalidValue.yang");
+    }
+
+    /**
+     * Checks if prefix listener updates the data model tree.
+     */
+    @Test
+    public void processPrefixValidEntry() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/PrefixValidEntry.yang");
+
+        // Checks for the version value in data model tree.
+        assertThat(((YangModule) node).getPrefix(), is("On"));
+    }
+
+    /**
+     * Checks prefix value with double quotes.
+     */
+    @Test
+    public void processPrefixWithDoubleQuotes() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/PrefixWithDoubleQuotes.yang");
+        assertThat(((YangModule) node).getPrefix(), is("On"));
+    }
+
+    /**
+     * Checks that prefix should be present just once.
+     */
+    @Test(expected = ParserException.class)
+    public void processPrefixDualEntry() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/PrefixDualEntry.yang");
+    }
+
+    /**
+     * Checks if prefix syntax is followed.
+     */
+    @Test(expected = ParserException.class)
+    public void processPrefixMissingValue() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/PrefixMissingValue.yang");
+    }
+
+    /**
+     * Checks that exception should be reported if prefix is missing.
+     */
+    @Test(expected = ParserException.class)
+    public void processPrefixOrder() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/PrefixOrder.yang");
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/PresenceListenerTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/PresenceListenerTest.java
new file mode 100644
index 0000000..2d0e376
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/PresenceListenerTest.java
@@ -0,0 +1,101 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import org.junit.Rule;
+import org.junit.Test;
+
+import org.junit.rules.ExpectedException;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangNodeType;
+import org.onosproject.yangutils.datamodel.YangContainer;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
+
+import java.io.IOException;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.is;
+import static org.hamcrest.Matchers.nullValue;
+
+/**
+ * Test cases for presence listener.
+ */
+public class PresenceListenerTest {
+
+    @Rule
+    public ExpectedException thrown = ExpectedException.none();
+
+    private final YangUtilsParserManager manager = new YangUtilsParserManager();
+
+    /**
+     * Checks presence statement as sub-statement of container.
+     */
+    @Test
+    public void processContainerSubStatementPresence() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ContainerSubStatementPresence.yang");
+
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        // Check whether the list is child of module
+        YangContainer yangContainer = (YangContainer) yangNode.getChild();
+        assertThat(yangContainer.getName(), is("valid"));
+        assertThat(yangContainer.getPresence(), is("\"invalid\""));
+    }
+
+    /**
+     * checks default value of presence statement.
+     */
+    @Test
+    public void processPresenceDefaultValue() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/PresenceDefaultValue.yang");
+
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        // Check whether the list is child of module
+        YangContainer yangContainer = (YangContainer) yangNode.getChild();
+        assertThat(yangContainer.getName(), is("valid"));
+        assertThat(yangContainer.getPresence(), is(nullValue()));
+    }
+
+    /**
+     * Checks presence statement without statement end.
+     */
+    @Test
+    public void processPresenceWithoutStatementEnd() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("mismatched input 'leaf' expecting {';', '+'}");
+        YangNode node = manager.getDataModel("src/test/resources/PresenceWithoutStatementEnd.yang");
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/RangeRestrictionListenerTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/RangeRestrictionListenerTest.java
new file mode 100644
index 0000000..0ed801f
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/RangeRestrictionListenerTest.java
@@ -0,0 +1,239 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import java.io.IOException;
+import java.util.ListIterator;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+import org.onosproject.yangutils.datamodel.YangDataTypes;
+import org.onosproject.yangutils.datamodel.YangLeaf;
+import org.onosproject.yangutils.datamodel.YangLeafList;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangNodeType;
+import org.onosproject.yangutils.datamodel.YangRangeInterval;
+import org.onosproject.yangutils.datamodel.YangRangeRestriction;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
+import org.onosproject.yangutils.datamodel.utils.builtindatatype.YangInt32;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.core.Is.is;
+
+/**
+ * Test cases for range restriction listener.
+ */
+public class RangeRestrictionListenerTest {
+
+    @Rule
+    public ExpectedException thrown = ExpectedException.none();
+
+    private final YangUtilsParserManager manager = new YangUtilsParserManager();
+
+    /**
+     * Checks valid range statement as sub-statement of leaf statement.
+     */
+    @Test
+    public void processValidRangeStatement() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ValidRangeStatement.yang");
+
+        assertThat((node instanceof YangModule), is(true));
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("int32"));
+        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.INT32));
+        YangRangeRestriction rangeRestriction = (YangRangeRestriction) leafInfo
+                .getDataType().getDataTypeExtendedInfo();
+
+        ListIterator<YangRangeInterval> rangeListIterator = rangeRestriction.getAscendingRangeIntervals()
+                .listIterator();
+        YangRangeInterval rangeInterval = rangeListIterator.next();
+        assertThat(((YangInt32) rangeInterval.getStartValue()).getValue(), is(1));
+        assertThat(((YangInt32) rangeInterval.getEndValue()).getValue(), is(4));
+    }
+
+    /**
+     * Checks valid range statement as sub-statement of leaf-list.
+     */
+    @Test
+    public void processRangeStatementInsideLeafList() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/RangeStatementInsideLeafList.yang");
+
+        assertThat((node instanceof YangModule), is(true));
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeafList> leafListIterator = yangNode.getListOfLeafList().listIterator();
+        YangLeafList leafListInfo = leafListIterator.next();
+
+        assertThat(leafListInfo.getName(), is("invalid-interval"));
+        assertThat(leafListInfo.getDataType().getDataTypeName(), is("int32"));
+        assertThat(leafListInfo.getDataType().getDataType(), is(YangDataTypes.INT32));
+        YangRangeRestriction rangeRestriction = (YangRangeRestriction) leafListInfo
+                .getDataType().getDataTypeExtendedInfo();
+
+        ListIterator<YangRangeInterval> rangeListIterator = rangeRestriction.getAscendingRangeIntervals()
+                .listIterator();
+        YangRangeInterval rangeInterval = rangeListIterator.next();
+
+        assertThat(((YangInt32) rangeInterval.getStartValue()).getValue(), is(1));
+        assertThat(((YangInt32) rangeInterval.getEndValue()).getValue(), is(4));
+    }
+
+    /**
+     * Checks valid range statement with one interval.
+     */
+    @Test
+    public void processRangeWithOneInterval() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/RangeWithOneInterval.yang");
+
+        assertThat((node instanceof YangModule), is(true));
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeafList> leafListIterator = yangNode.getListOfLeafList().listIterator();
+        YangLeafList leafListInfo = leafListIterator.next();
+
+        assertThat(leafListInfo.getName(), is("invalid-interval"));
+        assertThat(leafListInfo.getDataType().getDataTypeName(), is("int32"));
+        assertThat(leafListInfo.getDataType().getDataType(), is(YangDataTypes.INT32));
+        YangRangeRestriction rangeRestriction = (YangRangeRestriction) leafListInfo
+                .getDataType().getDataTypeExtendedInfo();
+
+        ListIterator<YangRangeInterval> rangeListIterator = rangeRestriction.getAscendingRangeIntervals()
+                .listIterator();
+        YangRangeInterval rangeInterval = rangeListIterator.next();
+
+        assertThat(((YangInt32) rangeInterval.getStartValue()).getValue(), is(1));
+        assertThat(((YangInt32) rangeInterval.getEndValue()).getValue(), is(1));
+    }
+
+    /**
+     * Checks valid range statement with min and max.
+     */
+    @Test
+    public void processRangeWithMinMax() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/RangeWithMinMax.yang");
+
+        assertThat((node instanceof YangModule), is(true));
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeafList> leafListIterator = yangNode.getListOfLeafList().listIterator();
+        YangLeafList leafListInfo = leafListIterator.next();
+
+        assertThat(leafListInfo.getName(), is("invalid-interval"));
+        assertThat(leafListInfo.getDataType().getDataTypeName(), is("int32"));
+        assertThat(leafListInfo.getDataType().getDataType(), is(YangDataTypes.INT32));
+        YangRangeRestriction rangeRestriction = (YangRangeRestriction) leafListInfo
+                .getDataType().getDataTypeExtendedInfo();
+
+        ListIterator<YangRangeInterval> rangeListIterator = rangeRestriction.getAscendingRangeIntervals()
+                .listIterator();
+        YangRangeInterval rangeInterval = rangeListIterator.next();
+
+        assertThat(((YangInt32) rangeInterval.getStartValue()).getValue(), is(-2147483648));
+        assertThat(((YangInt32) rangeInterval.getEndValue()).getValue(), is(2147483647));
+    }
+
+    /**
+     * Checks valid range statement with invalid integer pattern.
+     */
+    @Test
+    public void processRangeWithInvalidIntegerPattern() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("YANG file error : Input value \"a\" is not a valid int32.");
+        YangNode node = manager.getDataModel("src/test/resources/RangeWithInvalidIntegerPattern.yang");
+    }
+
+    /**
+     * Checks valid range statement with description.
+     */
+    @Test
+    public void processRangeSubStatements() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/RangeSubStatements.yang");
+
+        assertThat((node instanceof YangModule), is(true));
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("int32"));
+        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.INT32));
+        YangRangeRestriction rangeRestriction = (YangRangeRestriction) leafInfo
+                .getDataType().getDataTypeExtendedInfo();
+
+        assertThat(rangeRestriction.getDescription(), is("\"range description\""));
+        assertThat(rangeRestriction.getReference(), is("\"range reference\""));
+
+        ListIterator<YangRangeInterval> rangeListIterator = rangeRestriction.getAscendingRangeIntervals()
+                .listIterator();
+        YangRangeInterval rangeInterval = rangeListIterator.next();
+        assertThat(((YangInt32) rangeInterval.getStartValue()).getValue(), is(1));
+        assertThat(((YangInt32) rangeInterval.getEndValue()).getValue(), is(4));
+        assertThat(((YangInt32) rangeInterval.getEndValue()).getValue(), is(4));
+    }
+
+    /**
+     * Checks whether space can be allowed when range statement is present.
+     */
+    @Test
+    public void processRangeStatementWithSpace() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/RangeStatementWithSpace.yang");
+
+        assertThat((node instanceof YangModule), is(true));
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("int32"));
+        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.INT32));
+        YangRangeRestriction rangeRestriction = (YangRangeRestriction) leafInfo
+                .getDataType().getDataTypeExtendedInfo();
+
+        ListIterator<YangRangeInterval> rangeListIterator = rangeRestriction.getAscendingRangeIntervals()
+                .listIterator();
+        YangRangeInterval rangeInterval = rangeListIterator.next();
+        assertThat(((YangInt32) rangeInterval.getStartValue()).getValue(), is(1));
+        assertThat(((YangInt32) rangeInterval.getEndValue()).getValue(), is(4));
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/ReferenceListenerTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/ReferenceListenerTest.java
new file mode 100644
index 0000000..17a679a
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/ReferenceListenerTest.java
@@ -0,0 +1,250 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import java.io.IOException;
+import java.util.ListIterator;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+import org.onosproject.yangutils.datamodel.YangContainer;
+import org.onosproject.yangutils.datamodel.YangDataTypes;
+import org.onosproject.yangutils.datamodel.YangLeaf;
+import org.onosproject.yangutils.datamodel.YangLeafList;
+import org.onosproject.yangutils.datamodel.YangList;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangNodeType;
+import org.onosproject.yangutils.datamodel.YangStatusType;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.core.Is.is;
+
+/**
+ * Test case for reference listener.
+ */
+public class ReferenceListenerTest {
+
+    @Rule
+    public ExpectedException thrown = ExpectedException.none();
+
+    private final YangUtilsParserManager manager = new YangUtilsParserManager();
+
+    /**
+     * Checks valid reference statement.
+     */
+    @Test
+    public void processReferenceStatement() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ReferenceStatement.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        // Check whether the reference is set correctly.
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getReference(), is("\"RFC 6020\""));
+    }
+
+    /**
+     * Checks whether exception is thrown for invalid reference statement.
+     */
+    @Test
+    public void processReferenceWithoutStatementEnd() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("mismatched input '}' expecting {';', '+'}");
+        YangNode node = manager.getDataModel("src/test/resources/ReferenceWithoutStatementEnd.yang");
+    }
+
+    /**
+     * Checks valid reference statement under module.
+     */
+    @Test
+    public void processModuleSubStatementReference() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ModuleSubStatementReference.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        // Check whether the reference is set correctly.
+        assertThat(yangNode.getReference(), is("\"RFC 6020\""));
+    }
+
+    /**
+     * Checks valid reference statement under module.
+     */
+    @Test
+    public void processReferenceEmptyStatement() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ReferenceEmptyStatement.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        // Check whether the reference is set correctly.
+        assertThat(yangNode.getReference(), is("\"\""));
+    }
+
+    /**
+     * Checks valid reference statement as sub-statement of revision.
+     */
+    @Test
+    public void processRevisionSubStatementReference() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/RevisionSubStatementReference.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        // Check whether the reference is set correctly.
+        assertThat(yangNode.getRevision().getReference(), is("\"revision reference\""));
+    }
+
+    /**
+     * Checks reference statement as sub-statement of container.
+     */
+    @Test
+    public void processContainerSubStatementReference() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ContainerSubStatementReference.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        // Check whether the reference value is set correctly.
+        YangContainer container = (YangContainer) yangNode.getChild();
+        assertThat(container.getName(), is("valid"));
+        assertThat(container.getReference(), is("\"container reference\""));
+
+        // Check whether leaf properties as set correctly.
+        ListIterator<YangLeaf> leafIterator = container.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("uint16"));
+        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.UINT16));
+        assertThat(leafInfo.getUnits(), is("\"seconds\""));
+        assertThat(leafInfo.getDescription(), is("\"Interval before a route is declared invalid\""));
+        assertThat(leafInfo.isMandatory(), is(true));
+        assertThat(leafInfo.getStatus(), is(YangStatusType.CURRENT));
+        assertThat(leafInfo.getReference(), is("\"RFC 6020\""));
+    }
+
+    /**
+     * Checks reference statement as sub-statement of list.
+     */
+    @Test
+    public void processListSubStatementReference() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ListSubStatementReference.yang");
+
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        // Check whether the list is child of module and description value is set correctly.
+        YangList yangList = (YangList) yangNode.getChild();
+        assertThat(yangList.getName(), is("valid"));
+        assertThat(yangList.isConfig(), is(true));
+        assertThat(yangList.getReference(), is("\"list reference\""));
+
+        // Check whether leaf properties as set correctly.
+        ListIterator<YangLeaf> leafIterator = yangList.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("uint16"));
+        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.UINT16));
+        assertThat(leafInfo.getUnits(), is("\"seconds\""));
+        assertThat(leafInfo.getDescription(), is("\"Interval before a route is declared invalid\""));
+        assertThat(leafInfo.isMandatory(), is(true));
+        assertThat(leafInfo.getStatus(), is(YangStatusType.CURRENT));
+        assertThat(leafInfo.getReference(), is("\"RFC 6020\""));
+    }
+
+    /**
+     * Checks valid reference statement as sub-statement of leaf-list.
+     */
+    @Test
+    public void processLeafListSubStatementReference() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/LeafListSubStatementReference.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeafList> leafListIterator = yangNode.getListOfLeafList().listIterator();
+        YangLeafList leafListInfo = leafListIterator.next();
+
+        // Check whether description value is set correctly.
+        assertThat(leafListInfo.getName(), is("invalid-interval"));
+        assertThat(leafListInfo.getReference(), is("\"RFC 6020\""));
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/RevisionDateListenerTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/RevisionDateListenerTest.java
new file mode 100644
index 0000000..c12b377
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/RevisionDateListenerTest.java
@@ -0,0 +1,112 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import org.junit.Test;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
+
+import java.io.IOException;
+
+import static org.hamcrest.core.Is.is;
+import static org.junit.Assert.assertThat;
+
+/**
+ * Test cases for testing revision date listener functionality.
+ */
+public class RevisionDateListenerTest {
+
+    private final YangUtilsParserManager manager = new YangUtilsParserManager();
+
+    /**
+     * Checks if revision date syntax is correct in include.
+     */
+    @Test(expected = ParserException.class)
+    public void processRevisionDateInvalidSyntaxAtInclude() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/RevisionDateInvalidSyntaxAtInclude.yang");
+    }
+
+    /**
+     * Checks if revision date syntax is correct in import.
+     */
+    @Test(expected = ParserException.class)
+    public void processRevisionDateInvalidSyntaxAtImport() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/RevisionDateInvalidSyntaxAtImport.yang");
+    }
+
+    /**
+     * Checks revision date in quotes inside include.
+     */
+    @Test
+    public void processRevisionDateInQuotesAtInclude() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/RevisionDateInQuotesAtInclude.yang");
+        // Checks for the version value in data model tree.
+        assertThat(((YangModule) node).getImportList().get(0).getRevision(), is("2015-02-03"));
+        assertThat(((YangModule) node).getIncludeList().get(0).getRevision(), is("2016-02-03"));
+        assertThat(((YangModule) node).getIncludeList().get(1).getRevision(), is("2014-02-03"));
+    }
+
+    /**
+     * Checks revision date in quotes inside import.
+     */
+    @Test
+    public void processRevisionDateInQuotesAtImport() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/RevisionDateInQuotesAtImport.yang");
+        // Checks for the version value in data model tree.
+        assertThat(((YangModule) node).getImportList().get(0).getRevision(), is("2015-02-03"));
+        assertThat(((YangModule) node).getIncludeList().get(0).getRevision(), is("2016-02-03"));
+        assertThat(((YangModule) node).getIncludeList().get(1).getRevision(), is("2014-02-03"));
+    }
+
+    /**
+     * Checks if revision date follows YYYY-MM-DD format.
+     */
+    @Test(expected = ParserException.class)
+    public void processRevisionDateInvalidFormat() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/RevisionDateInvalidFormat.yang");
+    }
+
+    /**
+     * Checks if revision date is correct.
+     */
+    @Test(expected = ParserException.class)
+    public void processRevisionDateInvalid() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/RevisionDateInvalid.yang");
+    }
+
+    /**
+     * Checks if revision date listener updates the data model tree.
+     */
+    @Test
+    public void processRevisionDateValidEntry() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/RevisionDateValidEntry.yang");
+
+        // Checks for the version value in data model tree.
+        assertThat(((YangModule) node).getImportList().get(0).getRevision(), is("2015-02-03"));
+        assertThat(((YangModule) node).getIncludeList().get(0).getRevision(), is("2016-02-03"));
+        assertThat(((YangModule) node).getIncludeList().get(1).getRevision(), is("2014-02-03"));
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/RevisionListenerTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/RevisionListenerTest.java
new file mode 100644
index 0000000..a5eeb04
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/RevisionListenerTest.java
@@ -0,0 +1,78 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import org.junit.Test;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
+
+import java.io.IOException;
+
+import static org.hamcrest.core.Is.is;
+import static org.hamcrest.core.IsNull.notNullValue;
+import static org.junit.Assert.assertThat;
+
+/**
+ * Test cases for testing revision listener functionality.
+ */
+public class RevisionListenerTest {
+
+    private final YangUtilsParserManager manager = new YangUtilsParserManager();
+
+    /**
+     * Checks if revision doesn't have optional parameters "revision and
+     * description".
+     */
+    @Test
+    public void processRevisionNoOptionalParameter() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/RevisionNoOptionalParameter.yang");
+
+        // Checks for the version value in data model tree.
+        assertThat(((YangModule) node).getRevision().getRevDate(), is("2016-02-03"));
+    }
+
+    /**
+     * Checks if the syntax of revision is correct.
+     */
+    @Test(expected = ParserException.class)
+    public void processRevisionInValidSyntax() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/RevisionInValidSyntax.yang");
+    }
+
+    /**
+     * Checks if the correct order is followed.
+     */
+    @Test(expected = ParserException.class)
+    public void processRevisionInValidOrder() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/RevisionInValidOrder.yang");
+    }
+
+    /**
+     * Checks the revision with current date is created for empty revision statement.
+     */
+    @Test
+    public void processWithoutRevision() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/RevisionAbsence.yang");
+        assertThat(((YangModule) node).getRevision().getRevDate(), notNullValue());
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/RpcListenerTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/RpcListenerTest.java
new file mode 100644
index 0000000..3af045d
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/RpcListenerTest.java
@@ -0,0 +1,66 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import java.io.IOException;
+
+import org.junit.Test;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangRpc;
+import org.onosproject.yangutils.datamodel.YangTypeDef;
+import org.onosproject.yangutils.datamodel.YangStatusType;
+import org.onosproject.yangutils.datamodel.YangNodeType;
+import org.onosproject.yangutils.datamodel.YangDataTypes;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
+
+import static org.hamcrest.core.Is.is;
+import static org.junit.Assert.assertThat;
+
+/**
+ * Test cases for testing Rpc listener functionality.
+ */
+public class RpcListenerTest {
+
+    private final YangUtilsParserManager manager = new YangUtilsParserManager();
+
+    /**
+     * Checks valid rpc statements.
+     */
+    @Test
+    public void processValidRpcStatement() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ValidRpcStatement.yang");
+
+        assertThat((node instanceof YangModule), is(true));
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("rock"));
+
+        YangRpc yangRpc = (YangRpc) yangNode.getChild();
+        assertThat(yangRpc.getName(), is("rock-the-house"));
+        assertThat(yangRpc.getDescription(), is("\"description\""));
+        assertThat(yangRpc.getReference(), is("\"reference\""));
+        assertThat(yangRpc.getStatus(), is(YangStatusType.CURRENT));
+
+        YangTypeDef typeDef = (YangTypeDef) yangRpc.getChild();
+        assertThat(typeDef.getName(), is("my-type"));
+        assertThat(typeDef.getStatus(), is(YangStatusType.DEPRECATED));
+        assertThat(typeDef.getTypeDefBaseType().getDataType(), is(YangDataTypes.INT32));
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/ShortCaseListenerTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/ShortCaseListenerTest.java
new file mode 100644
index 0000000..132f7f4
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/ShortCaseListenerTest.java
@@ -0,0 +1,102 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.core.Is.is;
+import org.junit.Test;
+import org.onosproject.yangutils.datamodel.YangCase;
+import org.onosproject.yangutils.datamodel.YangChoice;
+import org.onosproject.yangutils.datamodel.YangContainer;
+import org.onosproject.yangutils.datamodel.YangList;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangNodeType;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
+
+import java.io.IOException;
+
+/**
+ * Test cases for short case listener.
+ */
+public class ShortCaseListenerTest {
+
+    private final YangUtilsParserManager manager = new YangUtilsParserManager();
+
+    /**
+     * Checks short case listener with container.
+     */
+    @Test
+    public void processShortCaseListenerWithContainer() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ShortCaseListenerWithContainer.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        YangContainer yangContainer = (YangContainer) yangNode.getChild();
+        assertThat(yangContainer.getName(), is("food"));
+
+        YangChoice yangChoice = (YangChoice) yangContainer.getChild();
+        assertThat(yangChoice.getName(), is("snack"));
+
+        YangCase yangCase = (YangCase) yangChoice.getChild();
+        assertThat(yangCase.getName(), is("sports-arena"));
+
+        YangContainer yangContainer1 = (YangContainer) yangCase.getChild();
+        assertThat(yangContainer1.getName(), is("sports-arena"));
+    }
+
+    /**
+     * Checks short case listener with list.
+     */
+    @Test
+    public void processShortCaseListenerWithList() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ShortCaseListenerWithList.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        YangContainer yangContainer = (YangContainer) yangNode.getChild();
+        assertThat(yangContainer.getName(), is("food"));
+
+        YangChoice yangChoice = (YangChoice) yangContainer.getChild();
+        assertThat(yangChoice.getName(), is("snack"));
+
+        YangCase yangCase = (YangCase) yangChoice.getChild();
+        assertThat(yangCase.getName(), is("sports-arena"));
+
+        YangList yangList = (YangList) yangCase.getChild();
+        assertThat(yangList.getName(), is("sports-arena"));
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/StatusListenerTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/StatusListenerTest.java
new file mode 100644
index 0000000..b2cbd71
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/StatusListenerTest.java
@@ -0,0 +1,288 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import java.io.IOException;
+import java.util.ListIterator;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+import org.onosproject.yangutils.datamodel.YangContainer;
+import org.onosproject.yangutils.datamodel.YangDataTypes;
+import org.onosproject.yangutils.datamodel.YangLeaf;
+import org.onosproject.yangutils.datamodel.YangLeafList;
+import org.onosproject.yangutils.datamodel.YangList;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangNodeType;
+import org.onosproject.yangutils.datamodel.YangStatusType;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.core.Is.is;
+
+/**
+ * Test cases for status listener.
+ */
+public class StatusListenerTest {
+
+    @Rule
+    public ExpectedException thrown = ExpectedException.none();
+
+    private final YangUtilsParserManager manager = new YangUtilsParserManager();
+
+    /**
+     * Checks valid status statement.
+     */
+    @Test
+    public void processStatusStatementCurrent() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/StatusStatementCurrent.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        // Check whether the status is set correctly.
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getStatus(), is(YangStatusType.CURRENT));
+    }
+
+    /**
+     * Checks valid status statement.
+     */
+    @Test
+    public void processStatusStatementDeprecated() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/StatusStatementDeprecated.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        // Check whether the status is set correctly.
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getStatus(), is(YangStatusType.DEPRECATED));
+    }
+
+    /**
+     * Checks valid status statement.
+     */
+    @Test
+    public void processStatusStatementObsolete() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/StatusStatementObsolete.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        // Check whether the status is set correctly.
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getStatus(), is(YangStatusType.OBSOLETE));
+    }
+
+    /**
+     * Checks whether exception is thrown for invalid status statement.
+     */
+    @Test
+    public void processStatusWithoutStatementEnd() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("missing ';' at '}'");
+        YangNode node = manager.getDataModel("src/test/resources/StatusWithoutStatementEnd.yang");
+    }
+
+    /**
+     * Checks whether exception is thrown for invalid status statement.
+     */
+    @Test
+    public void processStatusInvalidValue() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("YANG file error : status invalid is not valid.");
+        YangNode node = manager.getDataModel("src/test/resources/StatusInvalidValue.yang");
+    }
+
+    /**
+     * Checks status statement as sub-statement of module.
+     */
+    @Test
+    public void processModuleSubStatementStatus() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("mismatched input 'status' expecting {'anyxml', 'augment', 'choice', 'contact', "
+                + "'container', 'description', 'extension', 'deviation', 'feature', 'grouping', 'identity', 'import',"
+                + " 'include', 'leaf', 'leaf-list', 'list', 'notification', 'organization', 'reference', "
+                + "'revision', 'rpc', 'typedef', 'uses', '}'}");
+        YangNode node = manager.getDataModel("src/test/resources/ModuleSubStatementStatus.yang");
+    }
+
+    /**
+     * Checks status statement as sub-statement of container.
+     */
+    @Test
+    public void processContainerSubStatementStatus() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ContainerSubStatementStatus.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        // Check whether status is set correctly.
+        YangContainer container = (YangContainer) yangNode.getChild();
+        assertThat(container.getName(), is("valid"));
+        assertThat(container.isConfig(), is(true));
+        assertThat(container.getStatus(), is(YangStatusType.OBSOLETE));
+
+        // Check whether leaf properties as set correctly.
+        ListIterator<YangLeaf> leafIterator = container.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("uint16"));
+        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.UINT16));
+        assertThat(leafInfo.getUnits(), is("\"seconds\""));
+        assertThat(leafInfo.getDescription(), is("\"Interval before a route is declared invalid\""));
+        assertThat(leafInfo.isMandatory(), is(true));
+        assertThat(leafInfo.getStatus(), is(YangStatusType.CURRENT));
+        assertThat(leafInfo.getReference(), is("\"RFC 6020\""));
+    }
+
+    /**
+     * Checks status statement as sub-statement of list.
+     */
+    @Test
+    public void processListSubStatementStatus() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ListSubStatementStatus.yang");
+
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        // Check whether the list is child of module and status is set.
+        YangList yangList = (YangList) yangNode.getChild();
+        assertThat(yangList.getName(), is("valid"));
+        assertThat(yangList.isConfig(), is(true));
+        assertThat(yangList.getStatus(), is(YangStatusType.CURRENT));
+
+        // Check whether leaf properties as set correctly.
+        ListIterator<YangLeaf> leafIterator = yangList.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("uint16"));
+        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.UINT16));
+        assertThat(leafInfo.getUnits(), is("\"seconds\""));
+        assertThat(leafInfo.getDescription(), is("\"Interval before a route is declared invalid\""));
+        assertThat(leafInfo.isMandatory(), is(true));
+        assertThat(leafInfo.getStatus(), is(YangStatusType.CURRENT));
+        assertThat(leafInfo.getReference(), is("\"RFC 6020\""));
+    }
+
+    /**
+     * Checks valid status statement as sub-statement of leaf-list.
+     */
+    @Test
+    public void processLeafListSubStatementStatus() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/LeafListSubStatementStatus.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeafList> leafListIterator = yangNode.getListOfLeafList().listIterator();
+        YangLeafList leafListInfo = leafListIterator.next();
+
+        // Check whether status is set correctly.
+        assertThat(leafListInfo.getName(), is("invalid-interval"));
+        assertThat(leafListInfo.isConfig(), is(true));
+        assertThat(leafListInfo.getStatus(), is(YangStatusType.CURRENT));
+    }
+
+    /**
+     * Checks default value of status statement.
+     */
+    @Test
+    public void processStatusDefaultValue() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/StatusDefaultValue.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeafList> leafListIterator = yangNode.getListOfLeafList().listIterator();
+        YangLeafList leafListInfo = leafListIterator.next();
+
+        // Check whether status is set correctly.
+        assertThat(leafListInfo.getName(), is("invalid-interval"));
+        assertThat(leafListInfo.isConfig(), is(true));
+        assertThat(leafListInfo.getStatus(), is(YangStatusType.CURRENT));
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/SubModuleListenerTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/SubModuleListenerTest.java
new file mode 100644
index 0000000..6a53cbe
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/SubModuleListenerTest.java
@@ -0,0 +1,132 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import org.junit.Test;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangNodeType;
+import org.onosproject.yangutils.datamodel.YangSubModule;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
+
+import java.io.IOException;
+
+import static org.hamcrest.core.Is.is;
+import static org.hamcrest.core.IsNull.notNullValue;
+import static org.junit.Assert.assertThat;
+
+/**
+ * Test cases for testing submodule listener functionality.
+ */
+public class SubModuleListenerTest {
+
+    private final YangUtilsParserManager manager = new YangUtilsParserManager();
+
+    /**
+     * Checks if the sub module listeners updates the data model tree.
+     */
+    @Test
+    public void processSubModuleValidEntry() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/SubModuleValidEntry.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangSubModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.SUB_MODULE_NODE));
+
+        YangSubModule yangNode = (YangSubModule) node;
+        // Check whether the module name is set correctly.
+        assertThat(yangNode.getName(), is("Test"));
+        // Checks for the version value in data model tree.
+        assertThat(yangNode.getVersion(), is((byte) 1));
+        // Checks identifier of belongsto in data model tree.
+        assertThat(yangNode.getBelongsTo().getBelongsToModuleName(), is("ONOS"));
+        // Checks for the version value in data model tree.
+        assertThat(yangNode.getBelongsTo().getPrefix(), is("On1"));
+    }
+
+    /**
+     * Checks if the yang version and belongs to can come in any order in sub
+     * module.
+     */
+    @Test
+    public void processSubModuleOrder() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/SubModuleOrder.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangSubModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.SUB_MODULE_NODE));
+
+        YangSubModule yangNode = (YangSubModule) node;
+        // Check whether the module name is set correctly.
+        assertThat(yangNode.getName(), is("Test"));
+        // Checks for the version value in data model tree.
+        assertThat(yangNode.getVersion(), is((byte) 1));
+        // Checks identifier of belongsto in data model tree.
+        assertThat(yangNode.getBelongsTo().getBelongsToModuleName(), is("ONOS"));
+        // Checks for the version value in data model tree.
+        assertThat(yangNode.getBelongsTo().getPrefix(), is("On1"));
+    }
+
+    /**
+     * Checks if yang version is optional.
+     */
+    @Test
+    public void processSubModuleWithoutVersion() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/SubModuleWithoutVersion.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangSubModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.SUB_MODULE_NODE));
+
+        YangSubModule yangNode = (YangSubModule) node;
+        // Check whether the module name is set correctly.
+        assertThat(yangNode.getName(), is("Test"));
+        // Checks identifier of belongsto in data model tree.
+        assertThat(yangNode.getBelongsTo().getBelongsToModuleName(), is("ONOS"));
+        // Checks for the version value in data model tree.
+        assertThat(yangNode.getBelongsTo().getPrefix(), is("On1"));
+        //Checks the revision with current date is created for empty revision statement.
+        assertThat(((YangSubModule) node).getRevision().getRevDate(), notNullValue());
+    }
+
+    /**
+     * Checks if sub module name is correct.
+     */
+    @Test(expected = ParserException.class)
+    public void processSubModuleInvalidName() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/SubModuleInvalidName.yang");
+    }
+
+    /**
+     * Checks if sub module has invalid modules construct eg namespace.
+     */
+    @Test(expected = ParserException.class)
+    public void processSubModuleWithNamespace() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/SubModuleWithNamespace.yang");
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/TypeListenerTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/TypeListenerTest.java
new file mode 100644
index 0000000..1b6a7c6
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/TypeListenerTest.java
@@ -0,0 +1,164 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import java.io.IOException;
+import java.util.ListIterator;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+import org.onosproject.yangutils.datamodel.YangDataTypes;
+import org.onosproject.yangutils.datamodel.YangLeaf;
+import org.onosproject.yangutils.datamodel.YangLeafList;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangNodeType;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.core.Is.is;
+
+/**
+ * Test case for type listener.
+ */
+public class TypeListenerTest {
+
+    @Rule
+    public ExpectedException thrown = ExpectedException.none();
+
+    private final YangUtilsParserManager manager = new YangUtilsParserManager();
+
+    /**
+     * Checks derived statement without contraints.
+     */
+    @Test
+    public void processDerivedTypeStatement() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/DerivedTypeStatement.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("hello"));
+        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.DERIVED));
+    }
+
+    /**
+     * Checks valid yang data type.
+     */
+    @Test
+    public void processIntegerTypeStatement() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/IntegerTypeStatement.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("uint16"));
+        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.UINT16));
+    }
+
+    /**
+     * Checks type for leaf-list.
+     */
+    @Test
+    public void processLeafListSubStatementType() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/LeafListSubStatementType.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeafList> leafListIterator = yangNode.getListOfLeafList().listIterator();
+        YangLeafList leafListInfo = leafListIterator.next();
+
+        assertThat(leafListInfo.getName(), is("invalid-interval"));
+        assertThat(leafListInfo.getDataType().getDataTypeName(), is("uint16"));
+        assertThat(leafListInfo.getDataType().getDataType(), is(YangDataTypes.UINT16));
+    }
+
+    /**
+     * Checks for unsupported type leafref.
+     */
+    @Test
+    public void processLeafrefType() throws IOException, ParserException {
+
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("YANG file error : \"leafref\" is not supported in current version,"
+                + " please check wiki for YANG utils road map.");
+
+        YangNode node = manager
+                .getDataModel("src/test/resources/LeafrefInvalidIdentifier.yang");
+    }
+
+    /**
+     * Checks for unsupported type identityref.
+     */
+    @Test
+    public void processIdentityrefType() throws IOException, ParserException {
+
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("YANG file error : \"identityref\" is not supported in current version,"
+                + " please check wiki for YANG utils road map.");
+
+        YangNode node = manager
+                .getDataModel("src/test/resources/IdentityrefInvalidIdentifier.yang");
+    }
+
+    /**
+     * Checks for unsupported type instance identifier.
+     */
+    @Test
+    public void processInstanceIdentifierType() throws IOException, ParserException {
+
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("YANG file error : \"instance-identifier\" is not supported in current version,"
+                + " please check wiki for YANG utils road map.");
+
+        YangNode node = manager
+                .getDataModel("src/test/resources/InstanceIdentifierInvalidIdentifier.yang");
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/UnionListenerTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/UnionListenerTest.java
new file mode 100644
index 0000000..1ac199f
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/UnionListenerTest.java
@@ -0,0 +1,141 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import java.io.IOException;
+import java.util.List;
+import java.util.ListIterator;
+import org.junit.Test;
+import org.onosproject.yangutils.datamodel.YangDataTypes;
+import org.onosproject.yangutils.datamodel.YangLeaf;
+import org.onosproject.yangutils.datamodel.YangLeafList;
+import org.onosproject.yangutils.datamodel.YangList;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangNodeType;
+import org.onosproject.yangutils.datamodel.YangType;
+import org.onosproject.yangutils.datamodel.YangUnion;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.core.Is.is;
+
+/**
+ * Test cases for testing union listener.
+ */
+public class UnionListenerTest {
+
+    private final YangUtilsParserManager manager = new YangUtilsParserManager();
+
+    /**
+     * Checks union when type is in leaf.
+     */
+    @Test
+    public void processUnionWhenTypeInLeaf() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/UnionWhenTypeInLeaf.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        YangList yangList = (YangList) yangNode.getChild();
+        assertThat(yangList.getName(), is("valid"));
+
+        ListIterator<YangLeaf> leafIterator = yangList.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+
+        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.UNION));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("union"));
+
+        YangUnion yangUnion = (YangUnion) leafInfo.getDataType().getDataTypeExtendedInfo();
+
+        List<YangType<?>> typeList = yangUnion.getTypeList();
+        ListIterator<YangType<?>> typeListIterator = typeList.listIterator();
+        YangType<?> yangType = typeListIterator.next();
+
+        assertThat(yangType.getDataTypeName(), is("int32"));
+        assertThat(yangType.getDataType(), is(YangDataTypes.INT32));
+
+        YangType<?> yangTypeEnum = typeListIterator.next();
+
+        assertThat(yangTypeEnum.getDataTypeName(), is("enumeration"));
+        assertThat(yangTypeEnum.getDataType(), is(YangDataTypes.ENUMERATION));
+    }
+
+    /**
+     * Checks union when type is in leaflist.
+     */
+    @Test
+    public void processUnionWhenTypeInLeafList() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/UnionWhenTypeInLeafList.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        YangList yangList = (YangList) yangNode.getChild();
+        assertThat(yangList.getName(), is("valid"));
+
+        ListIterator<YangLeafList> leafListIterator = yangList.getListOfLeafList().listIterator();
+        YangLeafList leafListInfo = leafListIterator.next();
+
+        assertThat(leafListInfo.getName(), is("invalid-interval"));
+
+        assertThat(leafListInfo.getDataType().getDataType(), is(YangDataTypes.UNION));
+        assertThat(leafListInfo.getDataType().getDataTypeName(), is("union"));
+
+        YangUnion yangUnion = (YangUnion) leafListInfo.getDataType().getDataTypeExtendedInfo();
+
+        List<YangType<?>> typeList = yangUnion.getTypeList();
+        ListIterator<YangType<?>> typeListIterator = typeList.listIterator();
+        YangType<?> yangType = typeListIterator.next();
+
+        assertThat(yangType.getDataTypeName(), is("int32"));
+        assertThat(yangType.getDataType(), is(YangDataTypes.INT32));
+
+        YangType<?> yangTypeEnum = typeListIterator.next();
+
+        assertThat(yangTypeEnum.getDataTypeName(), is("enumeration"));
+        assertThat(yangTypeEnum.getDataType(), is(YangDataTypes.ENUMERATION));
+    }
+
+    /**
+     * Checks union with empty type.
+     */
+    @Test (expected = ParserException.class)
+    public void processUnionWithEmptyType() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/UnionWithEmptyType.yang");
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/UnitsListenerTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/UnitsListenerTest.java
new file mode 100644
index 0000000..6684df5
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/UnitsListenerTest.java
@@ -0,0 +1,188 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import java.io.IOException;
+import java.util.ListIterator;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+import org.onosproject.yangutils.datamodel.YangLeaf;
+import org.onosproject.yangutils.datamodel.YangLeafList;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangNodeType;
+import org.onosproject.yangutils.datamodel.YangStatusType;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.Matchers.nullValue;
+import static org.hamcrest.core.Is.is;
+
+/**
+ * Test cases for units listener.
+ */
+public class UnitsListenerTest {
+
+    @Rule
+    public ExpectedException thrown = ExpectedException.none();
+
+    private final YangUtilsParserManager manager = new YangUtilsParserManager();
+
+    /**
+     * Checks valid units statement.
+     */
+    @Test
+    public void processUnitsStatement() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/UnitsStatement.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat(node instanceof YangModule, is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        // Check whether units value is set correctly.
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getUnits(), is("\"seconds\""));
+    }
+
+    /**
+     * Checks invalid units statement as sub-statement of module.
+     */
+    @Test
+    public void processModuleSubStatementUnits() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("mismatched input 'type' expecting {'anyxml', 'augment', 'choice', 'contact', "
+                + "'container', 'description', 'extension', 'deviation', 'feature', 'grouping', 'identity',"
+                + " 'import', 'include', 'leaf', 'leaf-list', 'list', 'notification', 'organization', "
+                + "'reference', 'revision', 'rpc', 'typedef', 'uses', '}'}");
+        YangNode node = manager.getDataModel("src/test/resources/ModuleSubStatementUnits.yang");
+    }
+
+    /**
+     * Checks invalid units statement(without statement end).
+     */
+    @Test
+    public void processUnitsWithoutStatementEnd() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("mismatched input '}' expecting {';', '+'}");
+        YangNode node = manager.getDataModel("src/test/resources/UnitsWithoutStatementEnd.yang");
+    }
+
+    /**
+     * Checks order of units statement in leaf.
+     */
+    @Test
+    public void processUnitsStatementOrder() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/UnitsStatementOrder.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat(node instanceof YangModule, is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        // Check whether leaf properties is set correctly.
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("uint16"));
+        assertThat(leafInfo.getUnits(), is("\"seconds\""));
+        assertThat(leafInfo.getDescription(), is("\"Interval before a route is declared invalid\""));
+        assertThat(leafInfo.isConfig(), is(true));
+        assertThat(leafInfo.isMandatory(), is(true));
+        assertThat(leafInfo.getStatus(), is(YangStatusType.CURRENT));
+        assertThat(leafInfo.getReference(), is("\"RFC 6020\""));
+    }
+
+    /**
+     * Checks the default value of unit statement.
+     */
+    @Test
+    public void processUnitsDefaultValue() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/UnitsDefaultValue.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat(node instanceof YangModule, is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("invalid-interval"));
+        assertThat(leafInfo.getUnits(), is(nullValue()));
+    }
+
+    /**
+     * Checks invalid occurance of units statement as sub-statement of leaf.
+     */
+    @Test
+    public void processUnitsStatementCardinality() throws IOException, ParserException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("YANG file error: \"units\" is defined more than once in \"leaf invalid-interval\".");
+        YangNode node = manager.getDataModel("src/test/resources/UnitsStatementCardinality.yang");
+    }
+
+    /**
+     * Checks valid units statement as sub-statement of leaf-list.
+     */
+    @Test
+    public void processLeafListSubStatementUnits() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/LeafListSubStatementUnits.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat(node instanceof YangModule, is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeafList> leafListIterator = yangNode.getListOfLeafList().listIterator();
+        YangLeafList leafListInfo = leafListIterator.next();
+
+        // Check whether units value is set correctly.
+        assertThat(leafListInfo.getName(), is("invalid-interval"));
+        assertThat(leafListInfo.getUnits(), is("\"seconds\""));
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/UsesListenerTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/UsesListenerTest.java
new file mode 100644
index 0000000..a20c43e
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/UsesListenerTest.java
@@ -0,0 +1,132 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import java.io.IOException;
+import org.junit.Test;
+import org.onosproject.yangutils.datamodel.YangContainer;
+import org.onosproject.yangutils.datamodel.YangGrouping;
+import org.onosproject.yangutils.datamodel.YangList;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangNodeType;
+import org.onosproject.yangutils.datamodel.YangStatusType;
+import org.onosproject.yangutils.datamodel.YangUses;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.core.Is.is;
+
+/**
+ * Test cases for testing uses listener.
+ */
+public class UsesListenerTest {
+
+    private final YangUtilsParserManager manager = new YangUtilsParserManager();
+
+    /**
+     * Checks uses statement inside module.
+     */
+    @Test
+    public void processUsesInModule() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/UsesInModule.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        YangGrouping yangGrouping = (YangGrouping) yangNode.getChild();
+        assertThat(yangGrouping.getName(), is("endpoint"));
+
+        YangUses yangUses = (YangUses) yangGrouping.getNextSibling();
+        assertThat(yangUses.getName(), is("endpoint"));
+    }
+
+    /**
+     * Checks uses statement inside container.
+     */
+    @Test
+    public void processUsesInContainer() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/UsesInContainer.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        YangGrouping yangGrouping = (YangGrouping) yangNode.getChild();
+        assertThat(yangGrouping.getName(), is("endpoint"));
+
+        YangContainer yangContainer = (YangContainer) yangGrouping.getNextSibling();
+        assertThat(yangContainer.getName(), is("valid"));
+
+        YangUses yangUses = (YangUses) yangContainer.getChild();
+        assertThat(yangUses.getName(), is("endpoint"));
+
+        // Check attributes associated with uses.
+        assertThat(yangUses.getStatus(), is(YangStatusType.CURRENT));
+        assertThat(yangUses.getReference(), is("\"RFC 6020\""));
+        assertThat(yangUses.getDescription(), is("\"grouping under test\""));
+    }
+
+    /**
+     * Checks uses statement inside list.
+     */
+    @Test
+    public void processUsesInList() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/UsesInList.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        YangGrouping yangGrouping = (YangGrouping) yangNode.getChild();
+        assertThat(yangGrouping.getName(), is("endpoint"));
+
+        YangList yangList = (YangList) yangGrouping.getNextSibling();
+        assertThat(yangList.getName(), is("valid"));
+
+        YangUses yangUses = (YangUses) yangList.getChild();
+        assertThat(yangUses.getName(), is("endpoint"));
+
+        // Check attributes associated with uses.
+        assertThat(yangUses.getStatus(), is(YangStatusType.CURRENT));
+        assertThat(yangUses.getReference(), is("\"RFC 6020\""));
+        assertThat(yangUses.getDescription(), is("\"grouping under test\""));
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/ValueListenerTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/ValueListenerTest.java
new file mode 100644
index 0000000..6dae702
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/ValueListenerTest.java
@@ -0,0 +1,216 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.core.Is.is;
+import org.junit.Test;
+import org.onosproject.yangutils.datamodel.YangDataTypes;
+import org.onosproject.yangutils.datamodel.YangEnum;
+import org.onosproject.yangutils.datamodel.YangEnumeration;
+import org.onosproject.yangutils.datamodel.YangLeaf;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangNodeType;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
+
+import java.io.IOException;
+import java.util.ListIterator;
+import java.util.Set;
+
+/**
+ * Test cases for value listener.
+ */
+public class ValueListenerTest {
+
+    private final YangUtilsParserManager manager = new YangUtilsParserManager();
+
+    /**
+     * Checks explicitly configured value.
+     */
+    @Test
+    public void processValueStatement() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ValueStatement.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("speed"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("enumeration"));
+        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.ENUMERATION));
+        assertThat(((YangEnumeration) leafInfo.getDataType().getDataTypeExtendedInfo()).getName(),
+                is("speed_enum"));
+
+        Set<YangEnum> enumSet = ((YangEnumeration) leafInfo.getDataType().getDataTypeExtendedInfo()).getEnumSet();
+        for (YangEnum tmp : enumSet) {
+            if (tmp.getNamedValue().equals("10m")) {
+                assertThat(tmp.getValue(), is(10));
+            } else if (tmp.getNamedValue().equals("100m")) {
+                assertThat(tmp.getValue(), is(100));
+            } else if (tmp.getNamedValue().equals("auto")) {
+                assertThat(tmp.getValue(), is(1000));
+            }
+        }
+    }
+
+    /**
+     * Checks explicitly configured negative value.
+     */
+    @Test
+    public void processValueStatementWithNegativeValue() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ValueStatementWithNegativeValue.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("speed"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("enumeration"));
+        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.ENUMERATION));
+        assertThat(((YangEnumeration) leafInfo.getDataType().getDataTypeExtendedInfo()).getName(),
+                is("speed_enum"));
+
+        Set<YangEnum> enumSet = ((YangEnumeration) leafInfo.getDataType().getDataTypeExtendedInfo()).getEnumSet();
+        for (YangEnum tmp : enumSet) {
+            if (tmp.getNamedValue().equals("10m")) {
+                assertThat(tmp.getValue(), is(-2));
+            } else if (tmp.getNamedValue().equals("100m")) {
+                assertThat(tmp.getValue(), is(-1));
+            } else if (tmp.getNamedValue().equals("auto")) {
+                assertThat(tmp.getValue(), is(0));
+            }
+        }
+    }
+
+    /**
+     * Checks explicitly configured value with double quotes.
+     */
+    @Test
+    public void processValueStatementWithQuotes() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ValueStatementWithQuotes.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("speed"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("enumeration"));
+        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.ENUMERATION));
+        assertThat(((YangEnumeration) leafInfo.getDataType().getDataTypeExtendedInfo()).getName(),
+                is("speed_enum"));
+
+        Set<YangEnum> enumSet = ((YangEnumeration) leafInfo.getDataType().getDataTypeExtendedInfo()).getEnumSet();
+        for (YangEnum tmp : enumSet) {
+            if (tmp.getNamedValue().equals("10m")) {
+                assertThat(tmp.getValue(), is(10));
+            } else if (tmp.getNamedValue().equals("100m")) {
+                assertThat(tmp.getValue(), is(100));
+            } else if (tmp.getNamedValue().equals("auto")) {
+                assertThat(tmp.getValue(), is(1000));
+            }
+        }
+    }
+
+    /**
+     * Checks explicit value and auto generated value.
+     */
+    @Test
+    public void processValueAndAutoStatement() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ValueAndAutoStatement.yang");
+
+        // Check whether the data model tree returned is of type module.
+        assertThat((node instanceof YangModule), is(true));
+
+        // Check whether the node type is set properly to module.
+        assertThat(node.getNodeType(), is(YangNodeType.MODULE_NODE));
+
+        // Check whether the module name is set correctly.
+        YangModule yangNode = (YangModule) node;
+        assertThat(yangNode.getName(), is("Test"));
+
+        ListIterator<YangLeaf> leafIterator = yangNode.getListOfLeaf().listIterator();
+        YangLeaf leafInfo = leafIterator.next();
+
+        assertThat(leafInfo.getName(), is("speed"));
+        assertThat(leafInfo.getDataType().getDataTypeName(), is("enumeration"));
+        assertThat(leafInfo.getDataType().getDataType(), is(YangDataTypes.ENUMERATION));
+        assertThat(((YangEnumeration) leafInfo.getDataType().getDataTypeExtendedInfo()).getName(),
+                is("speed_enum"));
+
+        Set<YangEnum> enumSet = ((YangEnumeration) leafInfo.getDataType().getDataTypeExtendedInfo()).getEnumSet();
+        for (YangEnum tmp : enumSet) {
+            if (tmp.getNamedValue().equals("10m")) {
+                assertThat(tmp.getValue(), is(10));
+            } else if (tmp.getNamedValue().equals("100m")) {
+                assertThat(tmp.getValue(), is(11));
+            } else if (tmp.getNamedValue().equals("auto")) {
+                assertThat(tmp.getValue(), is(1000));
+            }
+        }
+    }
+
+    /**
+     * Checks explicit value should not be repeated.
+     */
+    @Test(expected = ParserException.class)
+    public void processValueDuplication() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ValueDuplication.yang");
+    }
+
+    /**
+     * Checks explicit or auto generated value should not be repeated.
+     */
+    @Test(expected = ParserException.class)
+    public void processValueExplicitAndAutoDuplication() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ValueExplicitAndAutoDuplication.yang");
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/VersionListenerTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/VersionListenerTest.java
new file mode 100644
index 0000000..3d9de83
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/listeners/VersionListenerTest.java
@@ -0,0 +1,111 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.listeners;
+
+import java.io.IOException;
+
+import org.junit.Test;
+import org.onosproject.yangutils.datamodel.YangModule;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
+
+import static org.hamcrest.core.Is.is;
+import static org.junit.Assert.assertThat;
+
+/**
+ * Test cases for testing version listener functionality.
+ */
+public class VersionListenerTest {
+
+    private final YangUtilsParserManager manager = new YangUtilsParserManager();
+
+    /**
+     * Checks if value of version is correct.
+     */
+    @Test(expected = ParserException.class)
+    public void processVersionInvalidValue() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/VersionInvalidValue.yang");
+    }
+
+    /**
+     * Checks if version listener updates the data model tree.
+     */
+    @Test
+    public void processVersionValidEntry() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/VersionValidEntry.yang");
+
+        // Checks for the version value in data model tree.
+        assertThat(((YangModule) node).getVersion(), is((byte) 1));
+    }
+
+    /**
+     * Checks version in double quotes.
+     */
+    @Test
+    public void processValidVersionWithDoubleQuotes() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/ValidVersionWithDoubleQuotes.yang");
+
+        // Checks for the version value in data model tree.
+        assertThat(((YangModule) node).getVersion(), is((byte) 1));
+    }
+
+    /**
+     * Checks if version which is optional paramater is not present.
+     */
+    @Test
+    public void processVersionNotPresent() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/VersionNotPresent.yang");
+
+        // Checks for the version value in data model tree.
+        assertThat(((YangModule) node).getVersion(), is((byte) 1));
+    }
+
+    /**
+     * Checks that version should be present only once.
+     */
+    @Test(expected = ParserException.class)
+    public void processVersionDualEntry() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/VersionDualEntry.yang");
+    }
+
+    /**
+     * Checks if version can appear in any order in module header.
+     */
+    @Test
+    public void processVersionOrder() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/VersionOrder.yang");
+
+        // Checks for the version value in data model tree.
+        assertThat(((YangModule) node).getVersion(), is((byte) 1));
+    }
+
+    /**
+     * Checks if sytax of version entry is not correct.
+     */
+    @Test(expected = ParserException.class)
+    public void processVersionInvalidSyntax() throws IOException, ParserException {
+
+        YangNode node = manager.getDataModel("src/test/resources/VersionInvalidSyntax.yang");
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/parseutils/AugmentListnerUtilTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/parseutils/AugmentListnerUtilTest.java
new file mode 100644
index 0000000..3cf6eaa
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/parseutils/AugmentListnerUtilTest.java
@@ -0,0 +1,320 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.parseutils;
+
+import org.junit.Test;
+import org.onosproject.yangutils.datamodel.YangNodeIdentifier;
+
+import static org.hamcrest.core.Is.is;
+import static org.junit.Assert.assertThat;
+import static org.onosproject.yangutils.parser.impl.parserutils.AugmentListenerUtil.clearOccurrenceCount;
+import static org.onosproject.yangutils.parser.impl.parserutils.AugmentListenerUtil.createValidNameForAugment;
+import static org.onosproject.yangutils.parser.impl.parserutils.AugmentListenerUtil.getAugmentJavaFileNameList;
+import static org.onosproject.yangutils.parser.impl.parserutils.AugmentListenerUtil.updateNameWhenHasMultipleOuccrrence;
+
+/**
+ * Unit test case for augment listener utility.
+ */
+public class AugmentListnerUtilTest {
+
+    private static final String TEST1 = "test1Node";
+    private static final String PARENT_PREFIX = "if";
+    private static final String NODE_PREFIX = "rf";
+
+    private static final String TEST1_AUGMENTED_NAME_WITHOUT_PREFIX = "AugmentedTest1Node";
+    private static final String TEST1_AUGMENTED_NAME_WITHOUT_PREFIX_MULTI1 = "AugmentedTest1Node1";
+    private static final String TEST1_AUGMENTED_NAME_WITHOUT_PREFIX_MULTI2 = "AugmentedTest1Node2";
+    private static final String TEST1_AUGMENTED_NAME_WITHOUT_PREFIX_MULTI3 = "AugmentedTest1Node3";
+
+    private static final String TEST1_AUGMENTED_NAME_WITH_PREFIX = "AugmentedRfTest1Node";
+    private static final String TEST1_AUGMENTED_NAME_WITH_PREFIX_MULTI1 = "AugmentedRfTest1Node1";
+    private static final String TEST1_AUGMENTED_NAME_WITH_PREFIX_MULTI2 = "AugmentedRfTest1Node2";
+    private static final String TEST1_AUGMENTED_NAME_WITH_PREFIX_MULTI3 = "AugmentedRfTest1Node3";
+
+    private static String testString = "";
+
+    /**
+     * Unit test case when parent's prefix is present and one occurrence of augment node to update same target node.
+     */
+    @Test
+    public void testForAugmentNameWhenOneOuccrrenceWithParentPrefix() {
+        clearData();
+        testString = createValidNameForAugment(getStubNodeIdetifierWithParentPrefix(),
+                isPrefixPresent(getStubNodeIdetifierWithParentPrefix()));
+        assertThat(true, is(testString.equals(TEST1_AUGMENTED_NAME_WITHOUT_PREFIX)));
+    }
+
+    /**
+     * Unit test case when no prefix and one occurrence of augment node to update same target node.
+     */
+    @Test
+    public void testForAugmentNameWhenOneOuccrrenceWithNoPrefix() {
+        clearData();
+        testString = createValidNameForAugment(getStubNodeIdetifierWithNoPrefix(),
+                isPrefixPresent(getStubNodeIdetifierWithNoPrefix()));
+        assertThat(true, is(testString.equals(TEST1_AUGMENTED_NAME_WITHOUT_PREFIX)));
+    }
+
+    /**
+     * Unit test case when different prefix then parent is present and
+     * one occurrence of augment node to update same target node.
+     */
+    @Test
+    public void testForAugmentNameWhenOneOuccrrenceWithDiffPrefix() {
+        clearData();
+        testString = createValidNameForAugment(getStubNodeIdetifierWithDiffPrefix(),
+                isPrefixPresent(getStubNodeIdetifierWithDiffPrefix()));
+        assertThat(true, is(testString.equals(TEST1_AUGMENTED_NAME_WITH_PREFIX)));
+    }
+
+    /**
+     * Unit test case when parent's prefix is present and two occurrence of augment node to update
+     * same target node is present.
+     */
+    @Test
+    public void testForAugmentNameWhenTwoOuccrrenceWithParentPrefix() {
+        clearData();
+
+        createValidNameForAugment(getStubNodeIdetifierWithParentPrefix(),
+                isPrefixPresent(getStubNodeIdetifierWithParentPrefix()));
+        testString = updateNameWhenHasMultipleOuccrrence(getStubNodeIdetifierWithParentPrefix(),
+                isPrefixPresent(getStubNodeIdetifierWithParentPrefix()));
+
+        assertThat(true, is(testString.equals(TEST1_AUGMENTED_NAME_WITHOUT_PREFIX_MULTI2)));
+    }
+
+    /**
+     * Unit test case when no prefix and two occurrence of augment node to update
+     * same target node is present.
+     */
+    @Test
+    public void testForAugmentNameWhenTwoOuccrrenceWithNoPrefix() {
+        clearData();
+
+        createValidNameForAugment(getStubNodeIdetifierWithNoPrefix(),
+                isPrefixPresent(getStubNodeIdetifierWithNoPrefix()));
+        testString = updateNameWhenHasMultipleOuccrrence(getStubNodeIdetifierWithNoPrefix(),
+                isPrefixPresent(getStubNodeIdetifierWithNoPrefix()));
+        assertThat(true, is(testString.equals(TEST1_AUGMENTED_NAME_WITHOUT_PREFIX_MULTI2)));
+    }
+
+    /**
+     * Unit test case when different prefix then parent is present and
+     * two occurrence of augment node to update same target node is present.
+     */
+    @Test
+    public void testForAugmentNameWhenTwoOuccrrenceWithDiffPrefix() {
+        clearData();
+
+        createValidNameForAugment(getStubNodeIdetifierWithDiffPrefix(),
+                isPrefixPresent(getStubNodeIdetifierWithDiffPrefix()));
+        testString = updateNameWhenHasMultipleOuccrrence(getStubNodeIdetifierWithDiffPrefix(),
+                isPrefixPresent(getStubNodeIdetifierWithDiffPrefix()));
+        assertThat(true, is(testString.equals(TEST1_AUGMENTED_NAME_WITH_PREFIX_MULTI2)));
+    }
+
+    /**
+     * Unit test case when parent prefix and three occurrence of augment node to update
+     * same target node is present.
+     */
+    @Test
+    public void testForAugmentNameWhenThreeOuccrrenceWithParentPrefix() {
+        clearData();
+
+        createValidNameForAugment(getStubNodeIdetifierWithParentPrefix(),
+                isPrefixPresent(getStubNodeIdetifierWithParentPrefix()));
+        updateNameWhenHasMultipleOuccrrence(getStubNodeIdetifierWithParentPrefix(),
+                isPrefixPresent(getStubNodeIdetifierWithParentPrefix()));
+
+        testString = updateNameWhenHasMultipleOuccrrence(getStubNodeIdetifierWithParentPrefix(),
+                isPrefixPresent(getStubNodeIdetifierWithParentPrefix()));
+        assertThat(true, is(testString.equals(TEST1_AUGMENTED_NAME_WITHOUT_PREFIX_MULTI3)));
+    }
+
+    /**
+     * Unit test case when no prefix and three occurrence of augment node to update
+     * same target node is present.
+     */
+    @Test
+    public void testForAugmentNameWhenThreeOuccrrenceNoPrefix() {
+        clearData();
+
+        createValidNameForAugment(getStubNodeIdetifierWithNoPrefix(),
+                isPrefixPresent(getStubNodeIdetifierWithNoPrefix()));
+        updateNameWhenHasMultipleOuccrrence(getStubNodeIdetifierWithNoPrefix(),
+                isPrefixPresent(getStubNodeIdetifierWithNoPrefix()));
+
+        testString = updateNameWhenHasMultipleOuccrrence(getStubNodeIdetifierWithNoPrefix(),
+                isPrefixPresent(getStubNodeIdetifierWithNoPrefix()));
+        assertThat(true, is(testString.equals(TEST1_AUGMENTED_NAME_WITHOUT_PREFIX_MULTI3)));
+    }
+
+    /**
+     * Unit test case when different prefix and three occurrence of augment node to update
+     * same target node is present.
+     */
+    @Test
+    public void testForAugmentNameWhenThreeOuccrrenceWithDiffPrefix() {
+        clearData();
+
+        createValidNameForAugment(getStubNodeIdetifierWithDiffPrefix(),
+                isPrefixPresent(getStubNodeIdetifierWithDiffPrefix()));
+        updateNameWhenHasMultipleOuccrrence(getStubNodeIdetifierWithDiffPrefix(),
+                isPrefixPresent(getStubNodeIdetifierWithDiffPrefix()));
+
+        testString = updateNameWhenHasMultipleOuccrrence(getStubNodeIdetifierWithDiffPrefix(),
+                isPrefixPresent(getStubNodeIdetifierWithDiffPrefix()));
+        assertThat(true, is(testString.equals(TEST1_AUGMENTED_NAME_WITH_PREFIX_MULTI3)));
+    }
+
+    /**
+     * Unit test case for when three occurrence is there and parent prefix is present,
+     * all the names need to be updated in list.
+     */
+    @Test
+    public void testForPreviousNamesGotUpdatedWhenParentPrefix() {
+        clearData();
+
+        createValidNameForAugment(getStubNodeIdetifierWithParentPrefix(),
+                isPrefixPresent(getStubNodeIdetifierWithParentPrefix()));
+        updateNameWhenHasMultipleOuccrrence(getStubNodeIdetifierWithParentPrefix(),
+                isPrefixPresent(getStubNodeIdetifierWithParentPrefix()));
+        updateNameWhenHasMultipleOuccrrence(getStubNodeIdetifierWithParentPrefix(),
+                isPrefixPresent(getStubNodeIdetifierWithParentPrefix()));
+
+        testString = getAugmentJavaFileNameList().get(0);
+        assertThat(true, is(testString.equals(TEST1_AUGMENTED_NAME_WITHOUT_PREFIX_MULTI1)));
+
+        testString = getAugmentJavaFileNameList().get(1);
+        assertThat(true, is(testString.equals(TEST1_AUGMENTED_NAME_WITHOUT_PREFIX_MULTI2)));
+
+        testString = getAugmentJavaFileNameList().get(2);
+        assertThat(true, is(testString.equals(TEST1_AUGMENTED_NAME_WITHOUT_PREFIX_MULTI3)));
+    }
+
+    /**
+     * Unit test case for when three occurrence is there and no prefix is present,
+     * all the names need to be updated in list.
+     */
+    @Test
+    public void testForPreviousNamesGotUpdatedWhenNoPrefix() {
+        clearData();
+
+        createValidNameForAugment(getStubNodeIdetifierWithNoPrefix(),
+                isPrefixPresent(getStubNodeIdetifierWithNoPrefix()));
+        updateNameWhenHasMultipleOuccrrence(getStubNodeIdetifierWithNoPrefix(),
+                isPrefixPresent(getStubNodeIdetifierWithNoPrefix()));
+        updateNameWhenHasMultipleOuccrrence(getStubNodeIdetifierWithNoPrefix(),
+                isPrefixPresent(getStubNodeIdetifierWithNoPrefix()));
+
+        testString = getAugmentJavaFileNameList().get(0);
+        assertThat(true, is(testString.equals(TEST1_AUGMENTED_NAME_WITHOUT_PREFIX_MULTI1)));
+
+        testString = getAugmentJavaFileNameList().get(1);
+        assertThat(true, is(testString.equals(TEST1_AUGMENTED_NAME_WITHOUT_PREFIX_MULTI2)));
+
+        testString = getAugmentJavaFileNameList().get(2);
+        assertThat(true, is(testString.equals(TEST1_AUGMENTED_NAME_WITHOUT_PREFIX_MULTI3)));
+    }
+
+    /**
+     * Unit test case for when three occurrence is there and different prefix is present,
+     * all the names need to be updated in list.
+     */
+    @Test
+    public void testForPreviousNamesGotUpdatedWhenDifferentPrefix() {
+        clearData();
+
+        createValidNameForAugment(getStubNodeIdetifierWithDiffPrefix(),
+                isPrefixPresent(getStubNodeIdetifierWithDiffPrefix()));
+        updateNameWhenHasMultipleOuccrrence(getStubNodeIdetifierWithDiffPrefix(),
+                isPrefixPresent(getStubNodeIdetifierWithDiffPrefix()));
+        updateNameWhenHasMultipleOuccrrence(getStubNodeIdetifierWithDiffPrefix(),
+                isPrefixPresent(getStubNodeIdetifierWithDiffPrefix()));
+
+        testString = getAugmentJavaFileNameList().get(0);
+        assertThat(true, is(testString.equals(TEST1_AUGMENTED_NAME_WITH_PREFIX_MULTI1)));
+
+        testString = getAugmentJavaFileNameList().get(1);
+        assertThat(true, is(testString.equals(TEST1_AUGMENTED_NAME_WITH_PREFIX_MULTI2)));
+
+        testString = getAugmentJavaFileNameList().get(2);
+        assertThat(true, is(testString.equals(TEST1_AUGMENTED_NAME_WITH_PREFIX_MULTI3)));
+    }
+
+    /**
+     * Returns stub node identifier when parent prefix is used.
+     *
+     * @param name name of node
+     * @param prefix prefix of node
+     * @return node identifier for node
+     */
+    private YangNodeIdentifier getStubNodeIdetifierWithParentPrefix() {
+        YangNodeIdentifier nodeId = new YangNodeIdentifier();
+        nodeId.setName(TEST1);
+        nodeId.setPrefix(PARENT_PREFIX);
+        return nodeId;
+    }
+
+    /**
+     * Returns stub node identifier when no prefix is used.
+     *
+     * @param name name of node
+     * @param prefix prefix of node
+     * @return node identifier for node
+     */
+    private YangNodeIdentifier getStubNodeIdetifierWithNoPrefix() {
+        YangNodeIdentifier nodeId = new YangNodeIdentifier();
+        nodeId.setName(TEST1);
+        nodeId.setPrefix(null);
+        return nodeId;
+    }
+
+    /**
+     * Returns stub node identifier when different prefix is used.
+     *
+     * @param name name of node
+     * @param prefix prefix of node
+     * @return node identifier for node
+     */
+    private YangNodeIdentifier getStubNodeIdetifierWithDiffPrefix() {
+        YangNodeIdentifier nodeId = new YangNodeIdentifier();
+        nodeId.setName(TEST1);
+        nodeId.setPrefix(NODE_PREFIX);
+        return nodeId;
+    }
+
+    /**
+     * Returns true if a prefix is present and it is not equals to parents prefix.
+     *
+     * @param nodeId YANG node identifier
+     * @param parentsPrefix parent's prefix
+     * @return true if a prefix is present and it is not equals to parents prefix
+     */
+    private static boolean isPrefixPresent(YangNodeIdentifier nodeId) {
+        return nodeId.getPrefix() != null && nodeId.getPrefix() != PARENT_PREFIX;
+    }
+
+    /**
+     * Clears list of names and occurrence count after each test case.
+     */
+    private void clearData() {
+        getAugmentJavaFileNameList().clear();
+        clearOccurrenceCount();
+    }
+
+}
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/parseutils/ListenerErrorMessageConstructionTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/parseutils/ListenerErrorMessageConstructionTest.java
new file mode 100644
index 0000000..bcfaf20
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/parseutils/ListenerErrorMessageConstructionTest.java
@@ -0,0 +1,96 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.parseutils;
+
+import org.junit.Test;
+
+import static org.hamcrest.core.Is.is;
+import static org.junit.Assert.assertThat;
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.CONTACT_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.ENTRY;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructExtendedListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_HOLDER;
+
+/**
+ * Test case for testing listener error message construction util.
+ */
+public class ListenerErrorMessageConstructionTest {
+
+    /**
+     * Checks for error message construction with parsable data type name.
+     */
+    @Test
+    public void checkErrorMsgConstructionWithName() {
+
+        // Create an test error message
+        String testErrorMessage = constructListenerErrorMessage(INVALID_HOLDER, CONTACT_DATA, "Test Instance", ENTRY);
+
+        // Check message.
+        assertThat(testErrorMessage, is("Internal parser error detected: Invalid holder for contact "
+                + "\"Test Instance\" before processing."));
+    }
+
+    /**
+     * Checks for error message construction without parsable data type name.
+     */
+    @Test
+    public void checkErrorMsgConstructionWithoutName() {
+
+        // Create an test error message
+        String testErrorMessage = constructListenerErrorMessage(INVALID_HOLDER, CONTACT_DATA, "Test Instance", ENTRY);
+
+        // Check message.
+        assertThat(testErrorMessage,
+                   is("Internal parser error detected: Invalid holder for contact \"Test Instance\""
+                           + " before processing."));
+    }
+
+    /**
+     * Checks for extended error message construction with parsable data type
+     * name.
+     */
+    @Test
+    public void checkExtendedErrorMsgConstructionWithName() {
+
+        // Create an test error message
+        String testErrorMessage = constructExtendedListenerErrorMessage(INVALID_HOLDER, CONTACT_DATA,
+                                                                        "Test Instance", ENTRY,
+                                                                        "Extended Information");
+
+        // Check message.
+        assertThat(testErrorMessage,
+                   is("Internal parser error detected: Invalid holder for contact \"Test Instance\""
+                           + " before processing.\n" + "Error Information: Extended Information"));
+    }
+
+    /**
+     * Checks for extended error message construction without parsable data type
+     * name.
+     */
+    @Test
+    public void checkExtendedErrorMsgConstructionWithoutName() {
+
+        // Create an test error message
+        String testErrorMessage = constructExtendedListenerErrorMessage(INVALID_HOLDER, CONTACT_DATA, "", ENTRY,
+                                                                        "Extended Information");
+
+        // Check message.
+        assertThat(testErrorMessage, is("Internal parser error detected: Invalid holder for contact"
+                + " before processing.\n" + "Error Information: Extended Information"));
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/parseutils/ListenerUtilTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/parseutils/ListenerUtilTest.java
new file mode 100644
index 0000000..c29b126
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/parseutils/ListenerUtilTest.java
@@ -0,0 +1,46 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.parseutils;
+
+import java.io.IOException;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
+
+/**
+ * Test case for testing listener util.
+ */
+public class ListenerUtilTest {
+
+    @Rule
+    public ExpectedException thrown = ExpectedException.none();
+
+    private final YangUtilsParserManager manager = new YangUtilsParserManager();
+
+    /**
+     * Checks whether exception is thrown when identifier starts with xml.
+     */
+    @Test
+    public void validateIdentifierStartsWithXml() throws IOException {
+        thrown.expect(ParserException.class);
+        thrown.expectMessage("YANG file error : module identifier xMlTest must not start" +
+                " with (('X'|'x') ('M'|'m') ('L'|'l'))");
+        manager.getDataModel("src/test/resources/InValidIdentifierXML.yang");
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/parseutils/ListenerValidationTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/parseutils/ListenerValidationTest.java
new file mode 100644
index 0000000..ce347d6
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/parseutils/ListenerValidationTest.java
@@ -0,0 +1,112 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.parseutils;
+
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+import org.onosproject.yangutils.datamodel.YangRevision;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.TreeWalkListener;
+
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.YANGBASE_DATA;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.EXIT;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructListenerErrorMessage;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.MISSING_HOLDER;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsEmpty;
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerValidation.checkStackIsNotEmpty;
+
+/**
+ * Test case for testing listener validation util.
+ */
+public class ListenerValidationTest {
+
+    @Rule
+    public ExpectedException thrown = ExpectedException.none();
+
+    /**
+     * Checks for exception in case parsable stack is empty while validating for
+     * not empty scenario.
+     */
+    @Test
+    public void validateStackIsNotEmptyForEmptyStack() {
+
+        String expectedError = constructListenerErrorMessage(MISSING_HOLDER, YANGBASE_DATA, "", EXIT);
+
+        // Get the exception occurred during parsing.
+        thrown.expect(ParserException.class);
+        thrown.expectMessage(expectedError);
+
+        // Create test walker and assign test error to it.
+        TreeWalkListener testWalker = new TreeWalkListener();
+
+        checkStackIsNotEmpty(testWalker, MISSING_HOLDER, YANGBASE_DATA, "", EXIT);
+    }
+
+    /**
+     * Checks if there is no exception in case parsable stack is not empty while
+     * validating for not empty scenario.
+     */
+    @Test
+    public void validateStackIsNotEmptyForNonEmptyStack() {
+
+        // Create test walker and assign test error to it.
+        TreeWalkListener testWalker = new TreeWalkListener();
+
+        // Create a temporary node of parsable.
+        YangRevision tmpNode = new YangRevision();
+        testWalker.getParsedDataStack().push(tmpNode);
+
+        checkStackIsNotEmpty(testWalker, MISSING_HOLDER, YANGBASE_DATA, "", EXIT);
+    }
+
+    /**
+     * Checks for exception in case parsable stack is not empty while validating
+     * for empty scenario.
+     */
+    @Test
+    public void validateStackIsEmptyForNonEmptyStack() {
+
+        String expectedError = constructListenerErrorMessage(MISSING_HOLDER, YANGBASE_DATA, "", EXIT);
+
+        // Get the exception occurred during parsing.
+        thrown.expect(ParserException.class);
+        thrown.expectMessage(expectedError);
+
+        // Create test walker and assign test error to it.
+        TreeWalkListener testWalker = new TreeWalkListener();
+
+        // Create a temporary node of parsable.
+        YangRevision tmpNode = new YangRevision();
+        testWalker.getParsedDataStack().push(tmpNode);
+
+        checkStackIsEmpty(testWalker, MISSING_HOLDER, YANGBASE_DATA, "", EXIT);
+    }
+
+    /**
+     * Checks if there is no exception in case parsable stack is empty while
+     * validating for empty scenario.
+     */
+    @Test
+    public void validateStackIsEmptyForEmptyStack() {
+
+        // Create test walker and assign test error to it.
+        TreeWalkListener testWalker = new TreeWalkListener();
+
+        checkStackIsEmpty(testWalker, MISSING_HOLDER, YANGBASE_DATA, "", EXIT);
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/parseutils/ParseTreeErrorListenerTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/parseutils/ParseTreeErrorListenerTest.java
new file mode 100644
index 0000000..4489e77
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/parser/impl/parseutils/ParseTreeErrorListenerTest.java
@@ -0,0 +1,101 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.parser.impl.parseutils;
+
+import org.antlr.v4.runtime.ANTLRFileStream;
+import org.antlr.v4.runtime.ANTLRInputStream;
+import org.antlr.v4.runtime.CommonTokenStream;
+import org.antlr.v4.runtime.tree.ParseTree;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangLexer;
+import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.CustomExceptionMatcher;
+import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
+import org.onosproject.yangutils.parser.impl.parserutils.ParseTreeErrorListener;
+
+import java.io.BufferedWriter;
+import java.io.File;
+import java.io.IOException;
+
+/**
+ * Test case for testing parse tree error listener.
+ */
+public class ParseTreeErrorListenerTest {
+
+    YangUtilsParserManager manager = new YangUtilsParserManager();
+    File file;
+    BufferedWriter out;
+
+    @Rule
+    public ExpectedException thrown = ExpectedException.none();
+
+    /**
+     * Checks that no exception is generated for YANG file with valid syntax.
+     */
+    @Test
+    public void checkValidYangFileForNoSyntaxError() throws IOException {
+
+        ANTLRInputStream input = new ANTLRFileStream("src/test/resources/YangFileWithoutSyntaxError.yang");
+
+        // Create a lexer that feeds off of input char stream.
+        GeneratedYangLexer lexer = new GeneratedYangLexer(input);
+        // Create a buffer of tokens pulled from the lexer.
+        CommonTokenStream tokens = new CommonTokenStream(lexer);
+        // Create a parser that feeds off the tokens buffer.
+        GeneratedYangParser parser = new GeneratedYangParser(tokens);
+        // Remove console error listener.
+        parser.removeErrorListeners();
+        // Create instance of customized error listener.
+        ParseTreeErrorListener parseTreeErrorListener = new ParseTreeErrorListener();
+        // Add customized error listener to catch errors during parsing.
+        parser.addErrorListener(parseTreeErrorListener);
+        // Begin parsing YANG file and generate parse tree.
+        ParseTree tree = parser.yangfile();
+    }
+
+    /**
+     * Checks that exception is generated for YANG file with invalid syntax.
+     */
+    @Test
+    public void checkInvalidYangFileForSyntaxError() throws IOException {
+
+        // Get the exception occurred during parsing.
+        thrown.expect(ParserException.class);
+        thrown.expect(CustomExceptionMatcher.errorLocation(3, 0));
+        thrown.expectMessage("no viable alternative at input 'yang-version 1\\nnamespace'");
+
+        ANTLRInputStream input = new ANTLRFileStream("src/test/resources/YangFileWithSyntaxError.yang");
+
+        // Create a lexer that feeds off of input char stream.
+        GeneratedYangLexer lexer = new GeneratedYangLexer(input);
+        // Create a buffer of tokens pulled from the lexer.
+        CommonTokenStream tokens = new CommonTokenStream(lexer);
+        // Create a parser that feeds off the tokens buffer.
+        GeneratedYangParser parser = new GeneratedYangParser(tokens);
+        // Remove console error listener.
+        parser.removeErrorListeners();
+        // Create instance of customized error listener.
+        ParseTreeErrorListener parseTreeErrorListener = new ParseTreeErrorListener();
+        // Add customized error listener to catch errors during parsing.
+        parser.addErrorListener(parseTreeErrorListener);
+        // Begin parsing YANG file and generate parse tree.
+        ParseTree tree = parser.yangfile();
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/translator/tojava/utils/AttributesJavaDataTypeTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/translator/tojava/utils/AttributesJavaDataTypeTest.java
new file mode 100644
index 0000000..f2ca36e
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/translator/tojava/utils/AttributesJavaDataTypeTest.java
@@ -0,0 +1,203 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.translator.tojava.utils;
+
+import java.lang.reflect.Constructor;
+import java.lang.reflect.InvocationTargetException;
+
+import org.junit.Test;
+import org.onosproject.yangutils.datamodel.YangDataTypes;
+import org.onosproject.yangutils.datamodel.YangDerivedInfo;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangType;
+import org.onosproject.yangutils.datamodel.exceptions.DataModelException;
+import org.onosproject.yangutils.translator.tojava.JavaFileInfo;
+import org.onosproject.yangutils.translator.tojava.javamodel.YangJavaModule;
+import org.onosproject.yangutils.translator.tojava.javamodel.YangJavaTypeDef;
+
+import static org.hamcrest.core.Is.is;
+import static org.hamcrest.core.IsNot.not;
+import static org.junit.Assert.assertThat;
+import static org.onosproject.yangutils.datamodel.YangDataTypes.BOOLEAN;
+import static org.onosproject.yangutils.datamodel.YangDataTypes.DERIVED;
+import static org.onosproject.yangutils.datamodel.YangDataTypes.INT32;
+import static org.onosproject.yangutils.datamodel.YangDataTypes.STRING;
+import static org.onosproject.yangutils.datamodel.YangDataTypes.UINT8;
+import static org.onosproject.yangutils.translator.tojava.utils.AttributesJavaDataType.getJavaDataType;
+import static org.onosproject.yangutils.translator.tojava.utils.AttributesJavaDataType.getJavaImportClass;
+import static org.onosproject.yangutils.translator.tojava.utils.AttributesJavaDataType.getJavaImportPackage;
+import static org.onosproject.yangutils.utils.UtilConstants.JAVA_LANG;
+
+/**
+ * Unit test case for attribute java data type.
+ */
+public class AttributesJavaDataTypeTest {
+
+    private static final YangDataTypes TYPE1 = STRING;
+    private static final YangDataTypes TYPE2 = INT32;
+    private static final YangDataTypes TYPE3 = BOOLEAN;
+    private static final YangDataTypes TYPE4 = UINT8;
+    private static final YangDataTypes TYPE_DEF = DERIVED;
+    private static final String CLASS_INFO1 = "String";
+    private static final String CLASS_INFO2 = "int";
+    private static final String CLASS_INFO3 = "boolean";
+    private static final String CLASS_INFO4 = "short";
+    private static final String CLASS_INFO5 = "Integer";
+    private static final String TYPE_DEF_PKG = "target.test";
+    private static String test = "";
+    private static YangToJavaNamingConflictUtil pluginConfig = null;
+
+    /**
+     * Unit test for private constructor.
+     *
+     * @throws SecurityException if any security violation is observed
+     * @throws NoSuchMethodException if when the method is not found
+     * @throws IllegalArgumentException if there is illegal argument found
+     * @throws InstantiationException if instantiation is provoked for the private constructor
+     * @throws IllegalAccessException if instance is provoked or a method is provoked
+     * @throws InvocationTargetException when an exception occurs by the method or constructor
+     */
+    @Test
+    public void callPrivateConstructors()
+            throws SecurityException, NoSuchMethodException, IllegalArgumentException,
+            InstantiationException, IllegalAccessException, InvocationTargetException {
+
+        Class<?>[] classesToConstruct = {AttributesJavaDataType.class };
+        for (Class<?> clazz : classesToConstruct) {
+            Constructor<?> constructor = clazz.getDeclaredConstructor();
+            constructor.setAccessible(true);
+            assertThat(null, not(constructor.newInstance()));
+        }
+    }
+
+    /**
+     * Unit test for java class info method test.
+     */
+    @Test
+    public void testgetJavaClassInfo() {
+        test = getJavaImportClass(getStubYangType(TYPE1), false, pluginConfig);
+        assertThat(true, is(test.equals(CLASS_INFO1)));
+
+        test = getJavaImportClass(getStubYangType(TYPE2), true, pluginConfig);
+        assertThat(true, is(test.equals(CLASS_INFO5)));
+
+        test = getJavaImportClass(getStubYangType(TYPE3), false, pluginConfig);
+        assertThat(null, is(test));
+
+        test = getJavaImportClass(getStubYangType(TYPE4), false, pluginConfig);
+        assertThat(null, is(test));
+    }
+
+    /**
+     * Unit test for java data type method.
+     */
+    @Test
+    public void testgetJavaDataType() {
+        test = getJavaDataType(getStubYangType(TYPE1));
+        assertThat(true, is(test.equals(CLASS_INFO1)));
+
+        test = getJavaDataType(getStubYangType(TYPE2));
+        assertThat(true, is(test.equals(CLASS_INFO2)));
+
+        test = getJavaDataType(getStubYangType(TYPE3));
+        assertThat(true, is(test.equals(CLASS_INFO3)));
+
+        test = getJavaDataType(getStubYangType(TYPE4));
+        assertThat(true, is(test.equals(CLASS_INFO4)));
+    }
+
+    /**
+     * Unit test for java package info method.
+     */
+    @Test
+    public void testgetJavaPkgInfo() {
+        test = getJavaImportPackage(getStubYangType(TYPE1), false, pluginConfig);
+        assertThat(true, is(test.equals(JAVA_LANG)));
+
+        test = getJavaImportPackage(getStubYangType(TYPE2), true, pluginConfig);
+        assertThat(true, is(test.equals(JAVA_LANG)));
+
+        test = getJavaImportPackage(getStubYangType(TYPE3), false, pluginConfig);
+        assertThat(null, is(test));
+
+        test = getJavaImportPackage(getStubYangType(TYPE4), false, pluginConfig);
+        assertThat(null, is(test));
+    }
+
+    /**
+     * Unit test case for typedef.
+     *
+     * @throws DataModelException when fails to do data model operations
+     */
+    @Test
+    public void testForTypeDef() throws DataModelException {
+        test = getJavaImportPackage(getStubExtendedInfo(getStubYangType(TYPE_DEF)), false, pluginConfig);
+        assertThat(true, is(test.equals(TYPE_DEF_PKG)));
+    }
+
+    /**
+     * Returns stub YANG type for test.
+     *
+     * @param dataTypes YANG data types
+     * @return YANG type
+     */
+    private YangType<?> getStubYangType(YangDataTypes dataTypes) {
+        YangType<?> type = new YangType<>();
+        type.setDataType(dataTypes);
+        return type;
+    }
+
+    /**
+     * Returns YANG type with extended info.
+     *
+     * @param type YANG type
+     * @return YANG type with extended info
+     * @throws DataModelException when fails to do data model operations
+     */
+    @SuppressWarnings("unchecked")
+    private YangType<?> getStubExtendedInfo(YangType<?> type) throws DataModelException {
+        YangJavaTypeDef typedef = new YangJavaTypeDef();
+        getStubParent().addChild(typedef);
+        YangDerivedInfo<?> derInfo = new YangDerivedInfo<>();
+        derInfo.setReferredTypeDef(typedef);
+        ((YangType<YangDerivedInfo<?>>) type).setDataTypeExtendedInfo(derInfo);
+        return type;
+    }
+
+    /**
+     * Returns java file info.
+     *
+     * @return java file info
+     */
+    private JavaFileInfo addStubJavaFileInfo() {
+        JavaFileInfo fileInfo = new JavaFileInfo();
+        fileInfo.setJavaName("test");
+        fileInfo.setPackage("target");
+        return fileInfo;
+    }
+
+    /**
+     * Adds stub parent module for typedef.
+     *
+     * @return stub parent module
+     */
+    private YangNode getStubParent() {
+        YangJavaModule parent = new YangJavaModule();
+        parent.setJavaFileInfo(addStubJavaFileInfo());
+        return parent;
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/translator/tojava/utils/ChoiceCaseTranslatorTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/translator/tojava/utils/ChoiceCaseTranslatorTest.java
new file mode 100644
index 0000000..74043f6
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/translator/tojava/utils/ChoiceCaseTranslatorTest.java
@@ -0,0 +1,53 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.translator.tojava.utils;
+
+import java.io.IOException;
+
+import org.junit.Test;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
+
+import static org.onosproject.yangutils.translator.tojava.JavaCodeGeneratorUtil.generateJavaCode;
+import static org.onosproject.yangutils.utils.io.impl.YangIoUtils.deleteDirectory;
+
+/**
+ * Unit tests for choice-case translator.
+ */
+public final class ChoiceCaseTranslatorTest {
+
+    private final YangUtilsParserManager manager = new YangUtilsParserManager();
+
+    /**
+     * Checks choice-case translation should not result in any exception.
+     */
+    @Test
+    public void processChoiceCaseTranslator() throws IOException, ParserException {
+
+        String userDir = System.getProperty("user.dir");
+        YangNode node = manager.getDataModel("src/test/resources/ChoiceCaseTranslator.yang");
+
+        YangPluginConfig yangPluginConfig = new YangPluginConfig();
+        yangPluginConfig.setCodeGenDir(userDir + "/target/ChoiceCaseTestGenFile/");
+
+        generateJavaCode(node, yangPluginConfig);
+
+        deleteDirectory(userDir + "/target/ChoiceCaseTestGenFile/");
+    }
+    // TODO enhance the test cases, after having a framework of translator test.
+}
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/translator/tojava/utils/ClassDefinitionGeneratorTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/translator/tojava/utils/ClassDefinitionGeneratorTest.java
new file mode 100644
index 0000000..39d5205
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/translator/tojava/utils/ClassDefinitionGeneratorTest.java
@@ -0,0 +1,112 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.translator.tojava.utils;
+
+import java.lang.reflect.Constructor;
+import java.lang.reflect.InvocationTargetException;
+
+import org.junit.Test;
+
+import static org.hamcrest.core.Is.is;
+import static org.hamcrest.core.IsNot.not;
+import static org.junit.Assert.assertThat;
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.BUILDER_CLASS_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.BUILDER_INTERFACE_MASK;
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.GENERATE_TYPEDEF_CLASS;
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.IMPL_CLASS_MASK;
+import static org.onosproject.yangutils.translator.tojava.utils.ClassDefinitionGenerator.generateClassDefinition;
+
+/**
+ * Unit tests for class definition generator for generated files.
+ */
+public final class ClassDefinitionGeneratorTest {
+
+    private static final String CLASS_NAME = "TestClass";
+    private static final String INTERFACE_CLASS_DEF = "public interface TestClass {\n";
+    private static final String BULDER_INTERFACE_CLASS_DEF = "interface TestClassBuilder {\n\n";
+    private static final String BUILDER_CLASS_DEF = "public class TestClassBuilder implements "
+            + "TestClass.TestClassBuilder {\n";
+    private static final String IMPL_CLASS_DEF = "public final class TestClassImpl implements TestClass {\n";
+    private static final String TYPE_DEF_CLASS_DEF = "public final class TestClass {\n";
+
+    /**
+     * Unit test for private constructor.
+     *
+     * @throws SecurityException if any security violation is observed
+     * @throws NoSuchMethodException if when the method is not found
+     * @throws IllegalArgumentException if there is illegal argument found
+     * @throws InstantiationException if instantiation is provoked for the private constructor
+     * @throws IllegalAccessException if instance is provoked or a method is provoked
+     * @throws InvocationTargetException when an exception occurs by the method or constructor
+     */
+    @Test
+    public void callPrivateConstructors()
+            throws SecurityException, NoSuchMethodException, IllegalArgumentException,
+            InstantiationException, IllegalAccessException, InvocationTargetException {
+
+        Class<?>[] classesToConstruct = {ClassDefinitionGenerator.class };
+        for (Class<?> clazz : classesToConstruct) {
+            Constructor<?> constructor = clazz.getDeclaredConstructor();
+            constructor.setAccessible(true);
+            assertThat(null, not(constructor.newInstance()));
+        }
+    }
+
+    /**
+     * Unit test for builder class definition.
+     */
+    @Test
+    public void generateBuilderClassDefinitionTest() {
+        String builderClassDefinition = generateClassDefinition(BUILDER_CLASS_MASK, CLASS_NAME);
+        assertThat(true, is(builderClassDefinition.equals(BUILDER_CLASS_DEF)));
+    }
+
+    /**
+     * Unit test for builder interface definition.
+     */
+    @Test
+    public void generateBuilderInterfaceDefinitionTest() {
+        String builderInterfaceDefinition = generateClassDefinition(BUILDER_INTERFACE_MASK, CLASS_NAME);
+        assertThat(true, is(builderInterfaceDefinition.equals(BULDER_INTERFACE_CLASS_DEF)));
+    }
+
+    /**
+     * Unit test for impl class definition.
+     */
+    @Test
+    public void generateImplDefinitionTest() {
+        String implDefinition = generateClassDefinition(IMPL_CLASS_MASK, CLASS_NAME);
+        assertThat(true, is(implDefinition.equals(IMPL_CLASS_DEF)));
+    }
+
+    /**
+     * Unit test for interface definition.
+     */
+    @Test
+    public void generateinterfaceDefinitionTest() {
+        // TODO: need to add this test case.
+    }
+
+    /**
+     * Unit test for typedef generated type.
+     */
+    @Test
+    public void generateTypeDefTest() {
+        String typeDef = generateClassDefinition(GENERATE_TYPEDEF_CLASS, CLASS_NAME);
+        assertThat(true, is(typeDef.equals(TYPE_DEF_CLASS_DEF)));
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/translator/tojava/utils/EnumTranslatorTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/translator/tojava/utils/EnumTranslatorTest.java
new file mode 100644
index 0000000..2a950fc
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/translator/tojava/utils/EnumTranslatorTest.java
@@ -0,0 +1,54 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.translator.tojava.utils;
+
+import java.io.IOException;
+
+import org.junit.Test;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
+
+import static org.onosproject.yangutils.translator.tojava.JavaCodeGeneratorUtil.generateJavaCode;
+import static org.onosproject.yangutils.utils.io.impl.YangIoUtils.deleteDirectory;
+
+/**
+ * Unit test case for enum translator.
+ */
+public final class EnumTranslatorTest {
+
+    private final YangUtilsParserManager manager = new YangUtilsParserManager();
+
+    /**
+     * Checks enum translation should not result in any exception.
+     */
+    @Test
+    public void processEnumTranslator()
+            throws IOException, ParserException {
+
+        String userDir = System.getProperty("user.dir");
+        YangNode node = manager.getDataModel("src/test/resources/EnumTranslator.yang");
+
+        YangPluginConfig yangPluginConfig = new YangPluginConfig();
+        yangPluginConfig.setCodeGenDir(userDir + "/target/EnumTestGenFile/");
+
+        generateJavaCode(node, yangPluginConfig);
+
+        deleteDirectory(userDir + "/target/EnumTestGenFile/");
+    }
+    // TODO enhance the test cases, after having a framework of translator test.
+}
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/translator/tojava/utils/JavaCodeSnippetGenTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/translator/tojava/utils/JavaCodeSnippetGenTest.java
new file mode 100644
index 0000000..fd5c0d3
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/translator/tojava/utils/JavaCodeSnippetGenTest.java
@@ -0,0 +1,123 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.translator.tojava.utils;
+
+import java.lang.reflect.Constructor;
+import java.lang.reflect.InvocationTargetException;
+
+import org.junit.Test;
+import org.onosproject.yangutils.translator.tojava.JavaQualifiedTypeInfo;
+
+import static org.hamcrest.MatcherAssert.assertThat;
+import static org.hamcrest.core.Is.is;
+import static org.hamcrest.core.IsNot.not;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaCodeSnippetGen.getImportText;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaCodeSnippetGen.getJavaAttributeDefination;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaCodeSnippetGen.getJavaClassDefClose;
+import static org.onosproject.yangutils.utils.UtilConstants.CLOSE_CURLY_BRACKET;
+import static org.onosproject.yangutils.utils.UtilConstants.DIAMOND_CLOSE_BRACKET;
+import static org.onosproject.yangutils.utils.UtilConstants.DIAMOND_OPEN_BRACKET;
+import static org.onosproject.yangutils.utils.UtilConstants.IMPORT;
+import static org.onosproject.yangutils.utils.UtilConstants.JAVA_LANG;
+import static org.onosproject.yangutils.utils.UtilConstants.LIST;
+import static org.onosproject.yangutils.utils.UtilConstants.NEW_LINE;
+import static org.onosproject.yangutils.utils.UtilConstants.PERIOD;
+import static org.onosproject.yangutils.utils.UtilConstants.PRIVATE;
+import static org.onosproject.yangutils.utils.UtilConstants.SEMI_COLAN;
+import static org.onosproject.yangutils.utils.UtilConstants.SPACE;
+import static org.onosproject.yangutils.utils.UtilConstants.STRING_DATA_TYPE;
+
+/**
+ * Unit test cases for java code snippet generator.
+ */
+public class JavaCodeSnippetGenTest {
+
+    private static final String PKG_INFO = "org.onosproject.unittest";
+    private static final String CLASS_INFO = "JavaCodeSnippetGenTest";
+    private static final String YANG_NAME = "Test";
+
+    /**
+     * Unit test for private constructor.
+     *
+     * @throws SecurityException if any security violation is observed
+     * @throws NoSuchMethodException if when the method is not found
+     * @throws IllegalArgumentException if there is illegal argument found
+     * @throws InstantiationException if instantiation is provoked for the private constructor
+     * @throws IllegalAccessException if instance is provoked or a method is provoked
+     * @throws InvocationTargetException when an exception occurs by the method or constructor
+     */
+    @Test
+    public void callPrivateConstructors()
+            throws SecurityException, NoSuchMethodException, IllegalArgumentException,
+            InstantiationException, IllegalAccessException, InvocationTargetException {
+
+        Class<?>[] classesToConstruct = {JavaCodeSnippetGen.class };
+        for (Class<?> clazz : classesToConstruct) {
+            Constructor<?> constructor = clazz.getDeclaredConstructor();
+            constructor.setAccessible(true);
+            assertThat(null, not(constructor.newInstance()));
+        }
+    }
+
+    /**
+     * Unit test case for import text.
+     */
+    @Test
+    public void testForImportText() {
+        JavaQualifiedTypeInfo importInfo = new JavaQualifiedTypeInfo();
+        importInfo.setPkgInfo(PKG_INFO);
+        importInfo.setClassInfo(CLASS_INFO);
+
+        String imports = getImportText(importInfo);
+
+        assertThat(true, is(imports.equals(IMPORT + PKG_INFO + PERIOD + CLASS_INFO + SEMI_COLAN + NEW_LINE)));
+    }
+
+    /**
+     * Unit test case for java class interface definition close.
+     */
+    @Test
+    public void testForJavaClassDefClose() {
+        String interfaceDef = getJavaClassDefClose();
+        assertThat(true, is(interfaceDef.equals(CLOSE_CURLY_BRACKET)));
+    }
+
+    /**
+     * Unit test case for java attribute info.
+     */
+    @Test
+    public void testForJavaAttributeInfo() {
+
+        String attributeWithoutTypePkg = getJavaAttributeDefination(null, STRING_DATA_TYPE, YANG_NAME, false);
+        assertThat(true, is(attributeWithoutTypePkg.equals(
+                PRIVATE + SPACE + STRING_DATA_TYPE + SPACE + YANG_NAME + SEMI_COLAN + NEW_LINE)));
+
+        String attributeWithTypePkg = getJavaAttributeDefination(JAVA_LANG, STRING_DATA_TYPE, YANG_NAME, false);
+        assertThat(true, is(attributeWithTypePkg.equals(PRIVATE + SPACE + JAVA_LANG + PERIOD
+                + STRING_DATA_TYPE + SPACE + YANG_NAME + SEMI_COLAN + NEW_LINE)));
+
+        String attributeWithListPkg = getJavaAttributeDefination(JAVA_LANG, STRING_DATA_TYPE, YANG_NAME, true);
+        assertThat(true, is(attributeWithListPkg.equals(
+                PRIVATE + SPACE + LIST + DIAMOND_OPEN_BRACKET + JAVA_LANG + PERIOD + STRING_DATA_TYPE
+                        + DIAMOND_CLOSE_BRACKET + SPACE + YANG_NAME + SEMI_COLAN + NEW_LINE)));
+
+        String attributeWithListWithoutPkg = getJavaAttributeDefination(null, STRING_DATA_TYPE, YANG_NAME, true);
+        assertThat(true, is(attributeWithListWithoutPkg.equals(
+                PRIVATE + SPACE + LIST + DIAMOND_OPEN_BRACKET + STRING_DATA_TYPE + DIAMOND_CLOSE_BRACKET + SPACE
+                        + YANG_NAME + SEMI_COLAN + NEW_LINE)));
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/translator/tojava/utils/JavaIdentifierSyntaxTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/translator/tojava/utils/JavaIdentifierSyntaxTest.java
new file mode 100644
index 0000000..6b86b9c
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/translator/tojava/utils/JavaIdentifierSyntaxTest.java
@@ -0,0 +1,284 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.translator.tojava.utils;
+
+import java.lang.reflect.Constructor;
+import java.lang.reflect.InvocationTargetException;
+
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+import org.onosproject.yangutils.translator.exception.TranslatorException;
+
+import static org.hamcrest.core.Is.is;
+import static org.hamcrest.core.IsNot.not;
+import static org.junit.Assert.assertThat;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaIdentifierSyntax.getCamelCase;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaIdentifierSyntax.getCapitalCase;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaIdentifierSyntax.getJavaPackageFromPackagePath;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaIdentifierSyntax.getPackageDirPathFromJavaJPackage;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaIdentifierSyntax.getRootPackage;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaIdentifierSyntax.getSmallCase;
+import static org.onosproject.yangutils.utils.UtilConstants.DEFAULT_BASE_PKG;
+import static org.onosproject.yangutils.utils.UtilConstants.PERIOD;
+
+/**
+ * Unit tests for java identifier syntax.
+ */
+public final class JavaIdentifierSyntaxTest {
+
+    @Rule
+    public ExpectedException thrown = ExpectedException.none();
+
+    private static final String PARENT_PACKAGE = "test5/test6/test7";
+    private static final String CHILD_PACKAGE = "test1:test2:test3";
+    private static final String DATE1 = "2000-1-5";
+    private static final String DATE2 = "1992-01-25";
+    private static final String PARENT_WITH_PERIOD = "test5.test6.test7";
+    private static final String CHILD_WITH_PERIOD = "test1.test2.test3";
+    private static final String DATE_WITH_REV1 = "rev20000105";
+    private static final String DATE_WITH_REV2 = "rev19920125";
+    private static final String VERSION_NUMBER = "v1";
+    private static final String VALID_PREFIX = "123add-prefix";
+    private static final String INVALID_PREFIX = "-*()&^&#$%";
+    private static final String INVALID_PREFIX1 = "abc~!@#$%^&*()_+}{:<>?`1234567890-=[]''|,./SS";
+    private static final String INVALID_NAME_SPACE_FOR_INVALID_PREFIX = "try:#test3:9case3";
+    private static final String INVALID_NAME_SPACE1 = "byte:#test2:9test3";
+    private static final String INVALID_NAME_SPACE2 = "const:#test2://9test3";
+    private static final String INVALID_NAME_SPACE3 = "CONST:TRY://9test3";
+    private static final String VALID_NAME_SPACE1 = "123addprefixbyte.test2.123addprefix9test3";
+    private static final String VALID_NAME_SPACE2 = "yangautoprefixconst.test2.yangautoprefix9test3";
+    private static final String VALID_NAME_SPACE3 = "abc1234567890ssconst.test2.abc1234567890ss9test3";
+    private static final String VALID_NAME_SPACE4 = "yangautoprefixconst.yangautoprefixtry.yangautoprefix9test3";
+    private static final String WITHOUT_CAMEL_CASE = "test-camel-case-identifier";
+    private static final String WITH_CAMEL_CASE = "testCamelCaseIdentifier";
+    private static final String WITHOUT_CAMEL_CASE1 = ".-_try-._-.123";
+    private static final String WITH_CAMEL_CASE1 = "try123";
+    private static final String WITHOUT_CAMEL_CASE2 = "_try";
+    private static final String WITH_CAMEL_CASE2 = "yangAutoPrefixTry";
+    private static final String WITHOUT_CAMEL_CASE3 = "-1-123g-123ga-a";
+    private static final String WITH_CAMEL_CASE3 = "yangAutoPrefix1123G123Gaa";
+    private static final String WITHOUT_CAMEL_CASE4 = "a-b-c-d-e-f-g-h";
+    private static final String WITH_CAMEL_CASE4 = "aBcDeFgh";
+    private static final String WITHOUT_CAMEL_CASE5 = "TestName";
+    private static final String WITH_CAMEL_CASE5 = "testName";
+    private static final String WITHOUT_CAMEL_CASE6 = "TEST-NAME";
+    private static final String WITH_CAMEL_CASE6 = "testName";
+    private static final String WITHOUT_CAMEL_CASE7 = "TESTNAME";
+    private static final String WITH_CAMEL_CASE7 = "testname";
+    private static final String WITHOUT_CAMEL_CASE8 = "TE-ST-NA-ME";
+    private static final String WITH_CAMEL_CASE8 = "teStNaMe";
+    private static final String WITHOUT_CAMEL_CASE9 = "TEST3NAME";
+    private static final String WITH_CAMEL_CASE9 = "test3Name";
+    private static final String WITHOUT_CAMEL_CASE10 = "TEST3";
+    private static final String WITH_CAMEL_CASE10 = "test3";
+    private static final String WITHOUT_CAMEL_CASE11 = "TEST3nAMe";
+    private static final String WITH_CAMEL_CASE11 = "test3Name";
+    private static final String WITHOUT_CAMEL_CASE12 = "TEST3name";
+    private static final String WITH_CAMEL_CASE12 = "test3Name";
+    private static final String WITHOUT_CAMEL_CASE13 = "t-RY";
+    private static final String WITH_CAMEL_CASE13 = "tRy";
+    private static final String WITHOUT_CAMEL_CASE14 = "TRY";
+    private static final String WITH_CAMEL_CASE14 = "yangAutoPrefixTry";
+    private static final String WITHOUT_CAPITAL = "test_this";
+    private static final String WITH_CAPITAL = "Test_this";
+    private static final String WITH_SMALL = "test_this";
+    private static final String WITH_CAMEL_CASE_WITH_PREFIX = "123addPrefixTry";
+    private static final String WITH_CAMEL_CASE_WITH_PREFIX1 = "abc1234567890Ss1123G123Gaa";
+    private static YangToJavaNamingConflictUtil conflictResolver = new YangToJavaNamingConflictUtil();
+
+    /**
+     * Unit test for private constructor.
+     *
+     * @throws SecurityException if any security violation is observed.
+     * @throws NoSuchMethodException if when the method is not found.
+     * @throws IllegalArgumentException if there is illegal argument found.
+     * @throws InstantiationException if instantiation is provoked for the
+     *             private constructor.
+     * @throws IllegalAccessException if instance is provoked or a method is
+     *             provoked.
+     * @throws InvocationTargetException when an exception occurs by the method
+     *             or constructor.
+     */
+    @Test
+    public void callPrivateConstructors() throws SecurityException, NoSuchMethodException, IllegalArgumentException,
+            InstantiationException, IllegalAccessException, InvocationTargetException {
+
+        Class<?>[] classesToConstruct = {JavaIdentifierSyntax.class };
+        for (Class<?> clazz : classesToConstruct) {
+            Constructor<?> constructor = clazz.getDeclaredConstructor();
+            constructor.setAccessible(true);
+            assertThat(null, not(constructor.newInstance()));
+        }
+    }
+
+    /**
+     * Unit test for root package generation with revision complexity.
+     */
+    @Test
+    public void getRootPackageTest() {
+        conflictResolver.setPrefixForIdentifier(null);
+        String rootPackage = getRootPackage((byte) 1, CHILD_PACKAGE, DATE1, conflictResolver);
+        assertThat(rootPackage.equals(DEFAULT_BASE_PKG + PERIOD + VERSION_NUMBER
+                + PERIOD + CHILD_WITH_PERIOD + PERIOD + DATE_WITH_REV1), is(true));
+    }
+
+    /**
+     * Unit test for root package generation with invalid prefix.
+     */
+    @Test
+    public void getRootPackageWithInvalidPrefix() throws TranslatorException {
+        thrown.expect(TranslatorException.class);
+        thrown.expectMessage("The given prefix in pom.xml is invalid.");
+        conflictResolver.setPrefixForIdentifier(INVALID_PREFIX);
+        String rootPackage1 = getRootPackage((byte) 1, INVALID_NAME_SPACE_FOR_INVALID_PREFIX, DATE1, conflictResolver);
+    }
+
+    /**
+     * Unit test for root package generation with special characters presence.
+     */
+    @Test
+    public void getRootPackageWithSpecialCharactersTest() {
+        conflictResolver.setPrefixForIdentifier(VALID_PREFIX);
+        String rootPackage = getRootPackage((byte) 1, INVALID_NAME_SPACE1, DATE1, conflictResolver);
+        assertThat(rootPackage.equals(DEFAULT_BASE_PKG + PERIOD + VERSION_NUMBER
+                + PERIOD + VALID_NAME_SPACE1 + PERIOD + DATE_WITH_REV1), is(true));
+        conflictResolver.setPrefixForIdentifier(null);
+        String rootPackage1 = getRootPackage((byte) 1, INVALID_NAME_SPACE2, DATE1, conflictResolver);
+        assertThat(rootPackage1.equals(DEFAULT_BASE_PKG + PERIOD + VERSION_NUMBER
+                + PERIOD + VALID_NAME_SPACE2 + PERIOD + DATE_WITH_REV1), is(true));
+        String rootPackage2 = getRootPackage((byte) 1, INVALID_NAME_SPACE3, DATE1, conflictResolver);
+        assertThat(rootPackage2.equals(DEFAULT_BASE_PKG + PERIOD + VERSION_NUMBER
+                + PERIOD + VALID_NAME_SPACE4 + PERIOD + DATE_WITH_REV1), is(true));
+        conflictResolver.setPrefixForIdentifier(INVALID_PREFIX1);
+        String rootPackage3 = getRootPackage((byte) 1, INVALID_NAME_SPACE2, DATE1, conflictResolver);
+        assertThat(rootPackage3.equals(DEFAULT_BASE_PKG + PERIOD + VERSION_NUMBER
+                + PERIOD + VALID_NAME_SPACE3 + PERIOD + DATE_WITH_REV1), is(true));
+
+    }
+
+    /**
+     * Unit test for root package generation without complexity in revision.
+     */
+    @Test
+    public void getRootPackageWithRevTest() {
+        String rootPkgWithRev = getRootPackage((byte) 1, CHILD_PACKAGE, DATE2, null);
+        assertThat(rootPkgWithRev.equals(
+                DEFAULT_BASE_PKG + PERIOD + VERSION_NUMBER + PERIOD + CHILD_WITH_PERIOD + PERIOD + DATE_WITH_REV2),
+                is(true));
+    }
+
+    /**
+     * Unit test for capitalizing the incoming string.
+     */
+    @Test
+    public void getCapitalCaseTest() {
+        String capitalCase = getCapitalCase(WITHOUT_CAPITAL);
+        assertThat(capitalCase.equals(WITH_CAPITAL), is(true));
+    }
+
+    /**
+     * Unit test for getting the camel case for the received string.
+     */
+    @Test
+    public void getCamelCaseTest() {
+        conflictResolver.setPrefixForIdentifier(null);
+        String camelCase = getCamelCase(WITHOUT_CAMEL_CASE, conflictResolver);
+        assertThat(camelCase.equals(WITH_CAMEL_CASE), is(true));
+        String camelCase1 = getCamelCase(WITHOUT_CAMEL_CASE1, conflictResolver);
+        assertThat(camelCase1.equals(WITH_CAMEL_CASE1), is(true));
+        String camelCase2 = getCamelCase(WITHOUT_CAMEL_CASE2, conflictResolver);
+        assertThat(camelCase2.equals(WITH_CAMEL_CASE2), is(true));
+        String camelCase3 = getCamelCase(WITHOUT_CAMEL_CASE3, conflictResolver);
+        assertThat(camelCase3.equals(WITH_CAMEL_CASE3), is(true));
+        String camelCase4 = getCamelCase(WITHOUT_CAMEL_CASE4, conflictResolver);
+        assertThat(camelCase4.equals(WITH_CAMEL_CASE4), is(true));
+        String camelCase5 = getCamelCase(WITHOUT_CAMEL_CASE5, conflictResolver);
+        assertThat(camelCase5.equals(WITH_CAMEL_CASE5), is(true));
+        String camelCase6 = getCamelCase(WITHOUT_CAMEL_CASE6, conflictResolver);
+        assertThat(camelCase6.equals(WITH_CAMEL_CASE6), is(true));
+        String camelCase7 = getCamelCase(WITHOUT_CAMEL_CASE7, conflictResolver);
+        assertThat(camelCase7.equals(WITH_CAMEL_CASE7), is(true));
+        String camelCase8 = getCamelCase(WITHOUT_CAMEL_CASE8, conflictResolver);
+        assertThat(camelCase8.equals(WITH_CAMEL_CASE8), is(true));
+        String camelCase9 = getCamelCase(WITHOUT_CAMEL_CASE9, conflictResolver);
+        assertThat(camelCase9.equals(WITH_CAMEL_CASE9), is(true));
+        String camelCase10 = getCamelCase(WITHOUT_CAMEL_CASE10, conflictResolver);
+        assertThat(camelCase10.equals(WITH_CAMEL_CASE10), is(true));
+        String camelCase11 = getCamelCase(WITHOUT_CAMEL_CASE11, conflictResolver);
+        assertThat(camelCase11.equals(WITH_CAMEL_CASE11), is(true));
+        String camelCase12 = getCamelCase(WITHOUT_CAMEL_CASE12, conflictResolver);
+        assertThat(camelCase12.equals(WITH_CAMEL_CASE12), is(true));
+        String camelCase13 = getCamelCase(WITHOUT_CAMEL_CASE13, conflictResolver);
+        assertThat(camelCase13.equals(WITH_CAMEL_CASE13), is(true));
+        String camelCase14 = getCamelCase(WITHOUT_CAMEL_CASE14, conflictResolver);
+        assertThat(camelCase14.equals(WITH_CAMEL_CASE14), is(true));
+    }
+
+    /**
+     * Unit test for getting the camel case along with the prefix provided.
+     */
+    @Test
+    public void getCamelCaseWithPrefixTest() {
+
+        conflictResolver.setPrefixForIdentifier(VALID_PREFIX);
+        String camelCase = getCamelCase(WITHOUT_CAMEL_CASE2, conflictResolver);
+        assertThat(camelCase.equals(WITH_CAMEL_CASE_WITH_PREFIX), is(true));
+        conflictResolver.setPrefixForIdentifier(INVALID_PREFIX1);
+        String camelCase2 = getCamelCase(WITHOUT_CAMEL_CASE3, conflictResolver);
+        assertThat(camelCase2.equals(WITH_CAMEL_CASE_WITH_PREFIX1), is(true));
+    }
+
+    /**
+     * Unit test for getting the camel case along with the invalid prefix provided.
+     */
+    @Test
+    public void getCamelCaseWithInvalidPrefixTest() throws TranslatorException {
+
+        thrown.expect(TranslatorException.class);
+        thrown.expectMessage("The given prefix in pom.xml is invalid.");
+        conflictResolver.setPrefixForIdentifier(INVALID_PREFIX);
+        String camelCase = getCamelCase(WITHOUT_CAMEL_CASE3, conflictResolver);
+    }
+
+    /**
+     * Unit test for getting the camel case for the received string.
+     */
+    @Test
+    public void getSmallCaseTest() {
+        String smallCase = getSmallCase(WITHOUT_CAPITAL);
+        assertThat(smallCase.equals(WITH_SMALL), is(true));
+    }
+
+    /**
+     * Unit test for getting the camel case for the received string.
+     */
+    @Test
+    public void getPackageFromPathTest() {
+        String pkg = getJavaPackageFromPackagePath(PARENT_PACKAGE);
+        assertThat(pkg.equals(PARENT_WITH_PERIOD), is(true));
+    }
+
+    /**
+     * Unit test for getting the camel case for the received string.
+     */
+    @Test
+    public void getPathFromPackageTest() {
+        String path = getPackageDirPathFromJavaJPackage(PARENT_WITH_PERIOD);
+        assertThat(path.equals(PARENT_PACKAGE), is(true));
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/translator/tojava/utils/MethodsGeneratorTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/translator/tojava/utils/MethodsGeneratorTest.java
new file mode 100644
index 0000000..05fe52d
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/translator/tojava/utils/MethodsGeneratorTest.java
@@ -0,0 +1,318 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.translator.tojava.utils;
+
+import java.lang.reflect.Constructor;
+import java.lang.reflect.InvocationTargetException;
+
+import org.junit.Test;
+import org.onosproject.yangutils.datamodel.YangType;
+import org.onosproject.yangutils.translator.tojava.JavaAttributeInfo;
+import org.onosproject.yangutils.translator.tojava.JavaQualifiedTypeInfo;
+
+import static org.hamcrest.core.Is.is;
+import static org.hamcrest.core.IsNot.not;
+import static org.junit.Assert.assertThat;
+import static org.onosproject.yangutils.datamodel.YangDataTypes.STRING;
+import static org.onosproject.yangutils.translator.tojava.GeneratedJavaFileType.GENERATE_SERVICE_AND_MANAGER;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaIdentifierSyntax.getCapitalCase;
+import static org.onosproject.yangutils.translator.tojava.utils.MethodsGenerator.getBuild;
+import static org.onosproject.yangutils.translator.tojava.utils.MethodsGenerator.getBuildForInterface;
+import static org.onosproject.yangutils.translator.tojava.utils.MethodsGenerator.getCheckNotNull;
+import static org.onosproject.yangutils.translator.tojava.utils.MethodsGenerator.getConstructor;
+import static org.onosproject.yangutils.translator.tojava.utils.MethodsGenerator.getConstructorStart;
+import static org.onosproject.yangutils.translator.tojava.utils.MethodsGenerator.getEqualsMethod;
+import static org.onosproject.yangutils.translator.tojava.utils.MethodsGenerator.getGetterForClass;
+import static org.onosproject.yangutils.translator.tojava.utils.MethodsGenerator.getGetterForInterface;
+import static org.onosproject.yangutils.translator.tojava.utils.MethodsGenerator.getOfMethod;
+import static org.onosproject.yangutils.translator.tojava.utils.MethodsGenerator.getOverRideString;
+import static org.onosproject.yangutils.translator.tojava.utils.MethodsGenerator.getSetterForClass;
+import static org.onosproject.yangutils.translator.tojava.utils.MethodsGenerator.getSetterForInterface;
+import static org.onosproject.yangutils.translator.tojava.utils.MethodsGenerator.getSetterForTypeDefClass;
+import static org.onosproject.yangutils.translator.tojava.utils.MethodsGenerator.getToStringMethod;
+import static org.onosproject.yangutils.translator.tojava.utils.MethodsGenerator.getTypeConstructorStringAndJavaDoc;
+import static org.onosproject.yangutils.utils.UtilConstants.ADD_STRING;
+import static org.onosproject.yangutils.utils.UtilConstants.BUILD;
+import static org.onosproject.yangutils.utils.UtilConstants.BUILDER;
+import static org.onosproject.yangutils.utils.UtilConstants.CHECK_NOT_NULL_STRING;
+import static org.onosproject.yangutils.utils.UtilConstants.CLOSE_CURLY_BRACKET;
+import static org.onosproject.yangutils.utils.UtilConstants.CLOSE_PARENTHESIS;
+import static org.onosproject.yangutils.utils.UtilConstants.COMMA;
+import static org.onosproject.yangutils.utils.UtilConstants.EIGHT_SPACE_INDENTATION;
+import static org.onosproject.yangutils.utils.UtilConstants.EQUAL;
+import static org.onosproject.yangutils.utils.UtilConstants.EQUALS_STRING;
+import static org.onosproject.yangutils.utils.UtilConstants.FOUR_SPACE_INDENTATION;
+import static org.onosproject.yangutils.utils.UtilConstants.GET_METHOD_PREFIX;
+import static org.onosproject.yangutils.utils.UtilConstants.IMPL;
+import static org.onosproject.yangutils.utils.UtilConstants.JAVA_LANG;
+import static org.onosproject.yangutils.utils.UtilConstants.NEW;
+import static org.onosproject.yangutils.utils.UtilConstants.NEW_LINE;
+import static org.onosproject.yangutils.utils.UtilConstants.OBJECT;
+import static org.onosproject.yangutils.utils.UtilConstants.OBJECT_STRING;
+import static org.onosproject.yangutils.utils.UtilConstants.OF;
+import static org.onosproject.yangutils.utils.UtilConstants.OPEN_CURLY_BRACKET;
+import static org.onosproject.yangutils.utils.UtilConstants.OPEN_PARENTHESIS;
+import static org.onosproject.yangutils.utils.UtilConstants.OVERRIDE;
+import static org.onosproject.yangutils.utils.UtilConstants.PERIOD;
+import static org.onosproject.yangutils.utils.UtilConstants.PUBLIC;
+import static org.onosproject.yangutils.utils.UtilConstants.QUOTES;
+import static org.onosproject.yangutils.utils.UtilConstants.RETURN;
+import static org.onosproject.yangutils.utils.UtilConstants.SEMI_COLAN;
+import static org.onosproject.yangutils.utils.UtilConstants.SET_METHOD_PREFIX;
+import static org.onosproject.yangutils.utils.UtilConstants.SIXTEEN_SPACE_INDENTATION;
+import static org.onosproject.yangutils.utils.UtilConstants.SPACE;
+import static org.onosproject.yangutils.utils.UtilConstants.STATIC;
+import static org.onosproject.yangutils.utils.UtilConstants.STRING_DATA_TYPE;
+import static org.onosproject.yangutils.utils.UtilConstants.SUFFIX_S;
+import static org.onosproject.yangutils.utils.UtilConstants.THIS;
+import static org.onosproject.yangutils.utils.UtilConstants.TWELVE_SPACE_INDENTATION;
+import static org.onosproject.yangutils.utils.UtilConstants.VALUE;
+import static org.onosproject.yangutils.utils.UtilConstants.VOID;
+
+/**
+ * Unit tests for generated methods from the file type.
+ */
+public final class MethodsGeneratorTest {
+
+    private static final String CLASS_NAME = "testname";
+    private static final String ATTRIBUTE_NAME = "testname";
+
+    /**
+     * Unit test for private constructor.
+     *
+     * @throws SecurityException         if any security violation is observed
+     * @throws NoSuchMethodException     if when the method is not found
+     * @throws IllegalArgumentException  if there is illegal argument found
+     * @throws InstantiationException    if instantiation is provoked for the private constructor
+     * @throws IllegalAccessException    if instance is provoked or a method is provoked
+     * @throws InvocationTargetException when an exception occurs by the method or constructor
+     */
+    @Test
+    public void callPrivateConstructors()
+            throws SecurityException, NoSuchMethodException, IllegalArgumentException,
+            InstantiationException, IllegalAccessException, InvocationTargetException {
+
+        Class<?>[] classesToConstruct = {MethodsGenerator.class };
+        for (Class<?> clazz : classesToConstruct) {
+            Constructor<?> constructor = clazz.getDeclaredConstructor();
+            constructor.setAccessible(true);
+            assertThat(null, not(constructor.newInstance()));
+        }
+    }
+
+    /**
+     * Unit test case for checking the parse builder and type constructor.
+     */
+    @Test
+    public void getTypeConstructorTest() {
+
+        YangPluginConfig pluginConfig = new YangPluginConfig();
+        JavaAttributeInfo testAttr = getTestAttribute();
+        String test = getTypeConstructorStringAndJavaDoc(testAttr, CLASS_NAME, pluginConfig);
+        assertThat(true, is(test.contains(PUBLIC + SPACE + CLASS_NAME + OPEN_PARENTHESIS)));
+    }
+
+    /**
+     * Test for build method for class.
+     */
+    @Test
+    public void getBuildTest() {
+        String method = getBuild(CLASS_NAME);
+        assertThat(true, is(method.equals(FOUR_SPACE_INDENTATION + PUBLIC + SPACE + CLASS_NAME + SPACE + BUILD
+                + OPEN_PARENTHESIS + CLOSE_PARENTHESIS + SPACE + OPEN_CURLY_BRACKET + NEW_LINE + EIGHT_SPACE_INDENTATION
+                + RETURN + SPACE + NEW + SPACE + CLASS_NAME + IMPL + OPEN_PARENTHESIS + THIS + CLOSE_PARENTHESIS
+                + SEMI_COLAN + NEW_LINE + FOUR_SPACE_INDENTATION + CLOSE_CURLY_BRACKET)));
+
+    }
+
+    /**
+     * Test for build method of interface.
+     */
+    @Test
+    public void getBuildForInterfaceTest() {
+        String method = getBuildForInterface(CLASS_NAME);
+        assertThat(true, is(method.equals(FOUR_SPACE_INDENTATION + CLASS_NAME + SPACE + BUILD +
+                OPEN_PARENTHESIS + CLOSE_PARENTHESIS + SEMI_COLAN + NEW_LINE)));
+    }
+
+    /**
+     * Test for check not null method.
+     */
+    @Test
+    public void getCheckNotNullTest() {
+        String method = getCheckNotNull(CLASS_NAME);
+        assertThat(true, is(method.equals(EIGHT_SPACE_INDENTATION + CHECK_NOT_NULL_STRING + OPEN_PARENTHESIS
+                + CLASS_NAME + COMMA + SPACE + CLASS_NAME + CLOSE_PARENTHESIS + SEMI_COLAN + NEW_LINE)));
+    }
+
+    /**
+     * Test case for constructor.
+     */
+    @Test
+    public void getConstructorTest() {
+        JavaAttributeInfo testAttr = getTestAttribute();
+        YangPluginConfig pluginConfig = new YangPluginConfig();
+        String method = getConstructor(CLASS_NAME, testAttr, GENERATE_SERVICE_AND_MANAGER, pluginConfig);
+        assertThat(true, is(method.contains(THIS + PERIOD + CLASS_NAME + SPACE + EQUAL + SPACE + "builder" + OBJECT
+                + PERIOD + GET_METHOD_PREFIX + "Testname" + OPEN_PARENTHESIS + CLOSE_PARENTHESIS + SEMI_COLAN)));
+    }
+
+    /**
+     * Test for constrcutor start method.
+     */
+    @Test
+    public void getConstructorStartTest() {
+        YangPluginConfig pluginConfig = new YangPluginConfig();
+        String method = getConstructorStart(CLASS_NAME, pluginConfig);
+        assertThat(true, is(method.contains(PUBLIC + SPACE + CLASS_NAME + IMPL + OPEN_PARENTHESIS + CLASS_NAME
+                + BUILDER + SPACE + BUILDER.toLowerCase() + OBJECT + CLOSE_PARENTHESIS + SPACE
+                + OPEN_CURLY_BRACKET + NEW_LINE)));
+    }
+
+    /**
+     * Test case for equals method.
+     */
+    @Test
+    public void getEqualsMethodTest() {
+        JavaAttributeInfo testAttr = getTestAttribute();
+        String method = getEqualsMethod(testAttr);
+        assertThat(true, is(method.contains(SIXTEEN_SPACE_INDENTATION + SPACE + OBJECT_STRING + SUFFIX_S + PERIOD
+                + EQUALS_STRING + OPEN_PARENTHESIS)));
+    }
+
+    /**
+     * Test for to string method.
+     */
+    @Test
+    public void getToStringMethodTest() {
+        JavaAttributeInfo testAttr = getTestAttribute();
+        String method = getToStringMethod(testAttr);
+        assertThat(true, is(method.equals(
+                TWELVE_SPACE_INDENTATION + PERIOD + ADD_STRING + OPEN_PARENTHESIS + QUOTES + testAttr.getAttributeName()
+                        + QUOTES + COMMA + SPACE + testAttr.getAttributeName() + CLOSE_PARENTHESIS)));
+    }
+
+    /**
+     * Test for getter method of class.
+     */
+    @Test
+    public void getGetterForClassTest() {
+        JavaAttributeInfo testAttr = getTestAttribute();
+        String method = getGetterForClass(testAttr, GENERATE_SERVICE_AND_MANAGER);
+        assertThat(true, is(method.contains(PUBLIC + SPACE + STRING_DATA_TYPE + SPACE + GET_METHOD_PREFIX)));
+    }
+
+    /**
+     * Test for getter of interface.
+     */
+    @Test
+    public void getGetterForInterfaceTest() {
+        String method = getGetterForInterface(CLASS_NAME, STRING_DATA_TYPE, false, GENERATE_SERVICE_AND_MANAGER);
+        assertThat(true, is(method.contains(STRING_DATA_TYPE + SPACE + GET_METHOD_PREFIX)));
+    }
+
+    /**
+     * Test case for setter method of class.
+     */
+    @Test
+    public void getSetterForClassTest() {
+        JavaAttributeInfo testAttr = getTestAttribute();
+        String method = getSetterForClass(testAttr, CLASS_NAME, GENERATE_SERVICE_AND_MANAGER);
+        assertThat(true, is(
+                method.contains(PUBLIC + SPACE + VOID + SPACE +
+                        SET_METHOD_PREFIX + getCapitalCase(CLASS_NAME) + OPEN_PARENTHESIS +
+                        STRING_DATA_TYPE + SPACE + ATTRIBUTE_NAME)));
+    }
+
+    /**
+     * Test for setter method of interface.
+     */
+    @Test
+    public void getSetterForInterfaceTest() {
+        String method = getSetterForInterface(CLASS_NAME, STRING_DATA_TYPE, CLASS_NAME, false,
+                GENERATE_SERVICE_AND_MANAGER);
+        assertThat(true, is(method.contains(VOID + SPACE +
+                SET_METHOD_PREFIX + "Testname")));
+    }
+
+    /**
+     * Test case for of method.
+     */
+    @Test
+    public void getOfMethodest() {
+        JavaAttributeInfo testAttr = getTestAttribute();
+        String method = getOfMethod(CLASS_NAME, testAttr);
+        assertThat(true, is(method.contains(PUBLIC + SPACE + STATIC + SPACE + CLASS_NAME + SPACE + OF + OPEN_PARENTHESIS
+                + STRING_DATA_TYPE + SPACE + VALUE + CLOSE_PARENTHESIS)));
+    }
+
+    /**
+     * Test case for setter in type def class.
+     */
+    @Test
+    public void getSetterForTypeDefClassTest() {
+        JavaAttributeInfo testAttr = getTestAttribute();
+        String method = getSetterForTypeDefClass(testAttr);
+        assertThat(true, is(method.contains(PUBLIC + SPACE + VOID + SPACE + SET_METHOD_PREFIX)));
+    }
+
+    /**
+     * Test case for over ride string.
+     */
+    @Test
+    public void getOverRideStringTest() {
+        String method = getOverRideString();
+        assertThat(true, is(method.contains(OVERRIDE)));
+    }
+
+    /**
+     * Returns java attribute.
+     *
+     * @return java attribute
+     */
+    private JavaAttributeInfo getTestAttribute() {
+        JavaAttributeInfo testAttr = new JavaAttributeInfo(getTestYangType(), ATTRIBUTE_NAME, false, false);
+        testAttr.setAttributeName(ATTRIBUTE_NAME);
+        testAttr.setAttributeType(getTestYangType());
+        testAttr.setImportInfo(getTestJavaQualifiedTypeInfo());
+        return testAttr;
+    }
+
+    /**
+     * Returns java qualified info.
+     *
+     * @return java qualified info
+     */
+    private JavaQualifiedTypeInfo getTestJavaQualifiedTypeInfo() {
+        JavaQualifiedTypeInfo info = new JavaQualifiedTypeInfo();
+        info.setPkgInfo(JAVA_LANG);
+        info.setClassInfo(STRING_DATA_TYPE);
+        return info;
+    }
+
+    /**
+     * Returns stub YANG type.
+     *
+     * @return test YANG type
+     */
+    private YangType<?> getTestYangType() {
+        YangType<?> attrType = new YangType<>();
+        attrType.setDataTypeName(STRING_DATA_TYPE);
+        attrType.setDataType(STRING);
+        return attrType;
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/translator/tojava/utils/NotificationTranslatorTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/translator/tojava/utils/NotificationTranslatorTest.java
new file mode 100644
index 0000000..f4d8bf8
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/translator/tojava/utils/NotificationTranslatorTest.java
@@ -0,0 +1,55 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.translator.tojava.utils;
+
+import java.io.IOException;
+
+import org.junit.Test;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
+
+import static org.onosproject.yangutils.translator.tojava.JavaCodeGeneratorUtil.generateJavaCode;
+import static org.onosproject.yangutils.utils.io.impl.YangIoUtils.deleteDirectory;
+
+/**
+ * Unit tests for union translator.
+ */
+public final class NotificationTranslatorTest {
+
+    private final YangUtilsParserManager manager = new YangUtilsParserManager();
+
+    /**
+     * Checks union translation should not result in any exception.
+     */
+    @Test
+    public void processUnionTranslator()
+            throws IOException, ParserException {
+
+        String userDir = System.getProperty("user.dir");
+        YangNode node = manager.getDataModel("src/test/resources/NotificationTest.yang");
+
+        YangPluginConfig yangPluginConfig = new YangPluginConfig();
+        yangPluginConfig.setCodeGenDir(userDir + "/target/NotificationTest/");
+
+        generateJavaCode(node, yangPluginConfig);
+
+        deleteDirectory(userDir + "/target/NotificationTest/");
+    }
+
+    // TODO enhance the test cases, after having a framework of translator test.
+}
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/translator/tojava/utils/RpcTranslatorTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/translator/tojava/utils/RpcTranslatorTest.java
new file mode 100644
index 0000000..9b8077c
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/translator/tojava/utils/RpcTranslatorTest.java
@@ -0,0 +1,54 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.translator.tojava.utils;
+
+import java.io.IOException;
+
+import org.junit.Test;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
+
+import static org.onosproject.yangutils.translator.tojava.JavaCodeGeneratorUtil.generateJavaCode;
+import static org.onosproject.yangutils.utils.io.impl.YangIoUtils.deleteDirectory;
+
+/**
+ * Unit tests for rpc translator.
+ */
+public final class RpcTranslatorTest {
+
+    private final YangUtilsParserManager manager = new YangUtilsParserManager();
+
+    /**
+     * Checks rpc translation should not result in any exception.
+     */
+    @Test
+    public void processRpcTranslator()
+            throws IOException, ParserException {
+
+        String userDir = System.getProperty("user.dir");
+        YangNode node = manager.getDataModel("src/test/resources/RpcTranslator.yang");
+
+        YangPluginConfig yangPluginConfig = new YangPluginConfig();
+        yangPluginConfig.setCodeGenDir(userDir + "/target/RpcTestGenFile/");
+
+        generateJavaCode(node, yangPluginConfig);
+
+        deleteDirectory(userDir + "/target/RpcTestGenFile/");
+    }
+    // TODO enhance the test cases, after having a framework of translator test.
+}
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/translator/tojava/utils/UnionTranslatorTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/translator/tojava/utils/UnionTranslatorTest.java
new file mode 100644
index 0000000..9dcdfdf
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/translator/tojava/utils/UnionTranslatorTest.java
@@ -0,0 +1,55 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.translator.tojava.utils;
+
+import java.io.IOException;
+
+import org.junit.Test;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.parser.impl.YangUtilsParserManager;
+
+import static org.onosproject.yangutils.translator.tojava.JavaCodeGeneratorUtil.generateJavaCode;
+import static org.onosproject.yangutils.utils.io.impl.YangIoUtils.deleteDirectory;
+
+/**
+ * Unit tests for union translator.
+ */
+public final class UnionTranslatorTest {
+
+    private final YangUtilsParserManager manager = new YangUtilsParserManager();
+
+    /**
+     * Checks union translation should not result in any exception.
+     */
+    @Test
+    public void processUnionTranslator()
+            throws IOException, ParserException {
+
+        String userDir = System.getProperty("user.dir");
+        YangNode node = manager.getDataModel("src/test/resources/UnionTranslator.yang");
+
+        YangPluginConfig yangPluginConfig = new YangPluginConfig();
+        yangPluginConfig.setCodeGenDir("target/UnionTestGenFile/");
+
+        generateJavaCode(node, yangPluginConfig);
+
+        deleteDirectory(userDir + "/target/UnionTestGenFile/");
+    }
+
+    // TODO enhance the test cases, after having a framework of translator test.
+}
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/utils/UtilConstantsTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/utils/UtilConstantsTest.java
new file mode 100644
index 0000000..a63d432
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/utils/UtilConstantsTest.java
@@ -0,0 +1,58 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.utils;
+
+import java.lang.reflect.Constructor;
+import java.lang.reflect.InvocationTargetException;
+
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+
+import static org.hamcrest.core.IsNot.not;
+import static org.junit.Assert.assertThat;
+
+/**
+ * Test case for testing the util constants.
+ */
+public final class UtilConstantsTest {
+
+    @Rule
+    public ExpectedException thrown = ExpectedException.none();
+
+    /**
+     * A private constructor is tested.
+     *
+     * @throws SecurityException if any security violation is observed
+     * @throws NoSuchMethodException if when the method is not found
+     * @throws IllegalArgumentException if there is illegal argument found
+     * @throws InstantiationException if instantiation is provoked for the private constructor
+     * @throws IllegalAccessException if instance is provoked or a method is provoked
+     * @throws InvocationTargetException when an exception occurs by the method or constructor
+     */
+    @Test
+    public void callPrivateConstructors() throws SecurityException, NoSuchMethodException, IllegalArgumentException,
+            InstantiationException, IllegalAccessException, InvocationTargetException {
+
+        Class<?>[] classesToConstruct = {UtilConstants.class };
+        for (Class<?> clazz : classesToConstruct) {
+            Constructor<?> constructor = clazz.getDeclaredConstructor();
+            constructor.setAccessible(true);
+            assertThat(null, not(constructor.newInstance()));
+        }
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/utils/io/impl/CopyrightHeaderTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/utils/io/impl/CopyrightHeaderTest.java
new file mode 100644
index 0000000..40ac92c
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/utils/io/impl/CopyrightHeaderTest.java
@@ -0,0 +1,106 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.utils.io.impl;
+
+import java.io.File;
+import java.io.FileInputStream;
+import java.io.FileOutputStream;
+import java.io.FileWriter;
+import java.io.IOException;
+import java.lang.reflect.Constructor;
+import java.lang.reflect.InvocationTargetException;
+import java.util.Calendar;
+
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+
+import static org.apache.commons.io.FileUtils.contentEquals;
+import static org.hamcrest.core.Is.is;
+import static org.hamcrest.core.IsNot.not;
+import static org.junit.Assert.assertThat;
+import static org.onosproject.yangutils.utils.io.impl.CopyrightHeader.getCopyrightHeader;
+
+/**
+ * Unit Tests for the CopyrightHeader contents.
+ */
+public final class CopyrightHeaderTest {
+
+    private static final String COPYRIGHTS_FIRST_LINE = "/*\n * Copyright " + Calendar.getInstance().get(Calendar.YEAR)
+            + "-present Open Networking Laboratory\n";
+    @Rule
+    public ExpectedException thrown = ExpectedException.none();
+
+    /**
+     * Unit test for testing private constructor.
+     *
+     * @throws SecurityException if any security violation is observed
+     * @throws NoSuchMethodException if when the method is not found
+     * @throws IllegalArgumentException if there is illegal argument found
+     * @throws InstantiationException if instantiation is provoked for the private constructor
+     * @throws IllegalAccessException if instance is provoked or a method is provoked
+     * @throws InvocationTargetException when an exception occurs by the method or constructor
+     */
+    @Test
+    public void callPrivateConstructors() throws SecurityException, NoSuchMethodException, IllegalArgumentException,
+            InstantiationException, IllegalAccessException, InvocationTargetException {
+
+        Class<?>[] classesToConstruct = {CopyrightHeader.class };
+        for (Class<?> clazz : classesToConstruct) {
+            Constructor<?> constructor = clazz.getDeclaredConstructor();
+            constructor.setAccessible(true);
+            assertThat(null, not(constructor.newInstance()));
+        }
+    }
+
+    /**
+     * This test case checks the received copyright header contents.
+     *
+     * @throws IOException when fails to do IO operations
+     */
+    @Test
+    public void testGetCopyrightHeader() throws IOException {
+
+        String path = "src/test/resources/CopyrightHeader.txt";
+
+        File testRsc = new File(path);
+        FileInputStream in = new FileInputStream(testRsc);
+
+        File testFile = new File("target/TestHeader.txt");
+        FileOutputStream out = new FileOutputStream(testFile);
+
+        out.write(COPYRIGHTS_FIRST_LINE.getBytes());
+        int c = 0;
+        while ((c = in.read()) != -1) {
+            out.write(c);
+        }
+
+        String licenseHeader = getCopyrightHeader();
+        File test = new File("target/TestCopyrightHeader.txt");
+
+        FileWriter writer = new FileWriter(test);
+        writer.write(licenseHeader);
+        writer.close();
+        out.close();
+        out.flush();
+        in.close();
+
+        assertThat(true, is(contentEquals(test, testFile)));
+        test.delete();
+        testFile.delete();
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/utils/io/impl/FileSystemUtilTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/utils/io/impl/FileSystemUtilTest.java
new file mode 100644
index 0000000..5fd728b
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/utils/io/impl/FileSystemUtilTest.java
@@ -0,0 +1,148 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.utils.io.impl;
+
+import java.io.File;
+import java.io.IOException;
+import java.lang.reflect.Constructor;
+import java.lang.reflect.InvocationTargetException;
+
+import org.junit.Test;
+import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.translator.tojava.JavaFileInfo;
+import org.onosproject.yangutils.translator.tojava.javamodel.YangJavaModule;
+import org.onosproject.yangutils.translator.tojava.utils.YangPluginConfig;
+
+import static org.apache.commons.io.FileUtils.deleteDirectory;
+import static org.hamcrest.core.Is.is;
+import static org.hamcrest.core.IsNot.not;
+import static org.junit.Assert.assertThat;
+import static org.onosproject.yangutils.utils.UtilConstants.PERIOD;
+import static org.onosproject.yangutils.utils.UtilConstants.SLASH;
+import static org.onosproject.yangutils.utils.io.impl.FileSystemUtil.appendFileContents;
+import static org.onosproject.yangutils.utils.io.impl.FileSystemUtil.createPackage;
+import static org.onosproject.yangutils.utils.io.impl.FileSystemUtil.doesPackageExist;
+import static org.onosproject.yangutils.utils.io.impl.FileSystemUtil.updateFileHandle;
+
+/**
+ * Tests the file handle utilities.
+ */
+public final class FileSystemUtilTest {
+
+    private static final String BASE_DIR_PKG = "target.UnitTestCase.";
+    private static final String BASE_PKG = "target/UnitTestCase";
+    private static final String TEST_DATA_1 = "This is to append a text to the file first1\n";
+    private static final String TEST_DATA_2 = "This is next second line\n";
+    private static final String TEST_DATA_3 = "This is next third line in the file";
+    private static final String TEST_FILE = "testFile";
+    private static final String SOURCE_TEST_FILE = "sourceTestFile";
+    private static final String DIR_PATH = "exist1.exist2.exist3";
+    private static final String PKG_INFO = "package-info.java";
+
+    /**
+     * A private constructor is tested.
+     *
+     * @throws SecurityException if any security violation is observed
+     * @throws NoSuchMethodException if when the method is not found
+     * @throws IllegalArgumentException if there is illegal argument found
+     * @throws InstantiationException if instantiation is provoked for the private constructor
+     * @throws IllegalAccessException if instance is provoked or a method is provoked
+     * @throws InvocationTargetException when an exception occurs by the method or constructor
+     */
+    @Test
+    public void callPrivateConstructors()
+            throws SecurityException, NoSuchMethodException, IllegalArgumentException,
+            InstantiationException, IllegalAccessException, InvocationTargetException {
+
+        Class<?>[] classesToConstruct = {FileSystemUtil.class };
+        for (Class<?> clazz : classesToConstruct) {
+            Constructor<?> constructor = clazz.getDeclaredConstructor();
+            constructor.setAccessible(true);
+            assertThat(null, not(constructor.newInstance()));
+        }
+    }
+
+    /**
+     * This test case checks the contents to be written in the file.
+     *
+     * @throws IOException when fails to create a test file
+     */
+    @Test
+    public void updateFileHandleTest() throws IOException {
+
+        File dir = new File(BASE_PKG + SLASH + TEST_FILE);
+        dir.mkdirs();
+        File createFile = new File(dir + TEST_FILE);
+        createFile.createNewFile();
+        File createSourceFile = new File(dir + SOURCE_TEST_FILE);
+        createSourceFile.createNewFile();
+        updateFileHandle(createFile, TEST_DATA_1, false);
+        updateFileHandle(createFile, TEST_DATA_2, false);
+        updateFileHandle(createFile, TEST_DATA_3, false);
+        appendFileContents(createFile, createSourceFile);
+        updateFileHandle(createFile, null, true);
+        deleteDirectory(dir);
+    }
+
+    /**
+     * This test  case checks whether the package is existing.
+     *
+     * @throws IOException when failed to create a test file
+     */
+    @Test
+    public void packageExistTest() throws IOException {
+
+        String strPath = BASE_DIR_PKG + DIR_PATH;
+        File createDir = new File(strPath.replace(PERIOD, SLASH));
+        createDir.mkdirs();
+        File createFile = new File(createDir + SLASH + PKG_INFO);
+        createFile.createNewFile();
+        assertThat(true, is(doesPackageExist(strPath)));
+        createPackage(getStubNode());
+        createDir.delete();
+        deleteDirectory(createDir);
+    }
+
+    /**
+     * Returns stub YANG node.
+     *
+     * @return stub node
+     */
+    private YangNode getStubNode() {
+        YangJavaModule module = new YangJavaModule();
+        module.setName(TEST_DATA_1);
+        JavaFileInfo javafileInfo = new JavaFileInfo();
+        javafileInfo.setJavaName(TEST_DATA_1);
+        javafileInfo.setBaseCodeGenPath("");
+        javafileInfo.setPackageFilePath(BASE_PKG);
+        javafileInfo.setPluginConfig(getStubPluginConfig());
+        module.setJavaFileInfo(javafileInfo);
+        return module;
+    }
+
+    /**
+     * Returns stub pluginConfig.
+     *
+     * @return stub pluginConfig
+     */
+    private YangPluginConfig getStubPluginConfig() {
+        YangPluginConfig pluginConfig = new YangPluginConfig();
+        pluginConfig.setConflictResolver(null);
+        return pluginConfig;
+    }
+
+}
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/utils/io/impl/JavaDocGenTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/utils/io/impl/JavaDocGenTest.java
new file mode 100644
index 0000000..2e9f436
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/utils/io/impl/JavaDocGenTest.java
@@ -0,0 +1,210 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.utils.io.impl;
+
+import java.lang.reflect.Constructor;
+import java.lang.reflect.InvocationTargetException;
+
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+import org.onosproject.yangutils.translator.tojava.utils.YangPluginConfig;
+
+import static org.hamcrest.core.Is.is;
+import static org.hamcrest.core.IsNot.not;
+import static org.junit.Assert.assertThat;
+import static org.onosproject.yangutils.utils.io.impl.JavaDocGen.getJavaDoc;
+import static org.onosproject.yangutils.utils.io.impl.JavaDocGen.JavaDocType.BUILDER_CLASS;
+import static org.onosproject.yangutils.utils.io.impl.JavaDocGen.JavaDocType.BUILDER_INTERFACE;
+import static org.onosproject.yangutils.utils.io.impl.JavaDocGen.JavaDocType.BUILD_METHOD;
+import static org.onosproject.yangutils.utils.io.impl.JavaDocGen.JavaDocType.CONSTRUCTOR;
+import static org.onosproject.yangutils.utils.io.impl.JavaDocGen.JavaDocType.DEFAULT_CONSTRUCTOR;
+import static org.onosproject.yangutils.utils.io.impl.JavaDocGen.JavaDocType.GETTER_METHOD;
+import static org.onosproject.yangutils.utils.io.impl.JavaDocGen.JavaDocType.IMPL_CLASS;
+import static org.onosproject.yangutils.utils.io.impl.JavaDocGen.JavaDocType.INTERFACE;
+import static org.onosproject.yangutils.utils.io.impl.JavaDocGen.JavaDocType.PACKAGE_INFO;
+import static org.onosproject.yangutils.utils.io.impl.JavaDocGen.JavaDocType.SETTER_METHOD;
+import static org.onosproject.yangutils.utils.io.impl.JavaDocGen.JavaDocType.TYPE_DEF_SETTER_METHOD;
+
+/**
+ * Tests the java doc that is generated.
+ */
+public final class JavaDocGenTest {
+
+    private static final String TEST_NAME = "testName";
+    private static final String END_STRING = " */\n";
+
+    @Rule
+    public ExpectedException thrown = ExpectedException.none();
+
+    /**
+     * This test case checks the content received for the builder class java doc.
+     */
+    @Test
+    public void builderClassGenerationTest() {
+        String builderClassJavaDoc = getJavaDoc(BUILDER_CLASS, TEST_NAME, false, getStubPluginConfig());
+        assertThat(true, is(builderClassJavaDoc.contains("Represents the builder implementation of")
+                && builderClassJavaDoc.contains(END_STRING)));
+    }
+
+    /**
+     * This test case checks the content received for the builder interface ge java doc.
+     */
+    @Test
+    public void builderInterfaceGenerationTest() {
+        String builderInterfaceJavaDoc = getJavaDoc(BUILDER_INTERFACE, TEST_NAME, false, getStubPluginConfig());
+        assertThat(true,
+                is(builderInterfaceJavaDoc.contains("Builder for")
+                        && builderInterfaceJavaDoc.contains(END_STRING)));
+    }
+
+    /**
+     * This test case checks the content received for the build  java doc.
+     */
+    @Test
+    public void buildGenerationTest() {
+        String buildDoc = getJavaDoc(BUILD_METHOD, TEST_NAME, false, getStubPluginConfig());
+        assertThat(true, is(buildDoc.contains("Builds object of") && buildDoc.contains(END_STRING)));
+    }
+
+    /**
+     * A private constructor is tested.
+     *
+     * @throws SecurityException if any security violation is observed
+     * @throws NoSuchMethodException if when the method is not found
+     * @throws IllegalArgumentException if there is illegal argument found
+     * @throws InstantiationException if instantiation is provoked for the private constructor
+     * @throws IllegalAccessException if instance is provoked or a method is provoked
+     * @throws InvocationTargetException when an exception occurs by the method or constructor
+     */
+    @Test
+    public void callPrivateConstructors()
+            throws SecurityException, NoSuchMethodException, IllegalArgumentException,
+            InstantiationException, IllegalAccessException, InvocationTargetException {
+
+        Class<?>[] classesToConstruct = {JavaDocGen.class };
+        for (Class<?> clazz : classesToConstruct) {
+            Constructor<?> constructor = clazz.getDeclaredConstructor();
+            constructor.setAccessible(true);
+            assertThat(null, not(constructor.newInstance()));
+        }
+    }
+
+    /**
+     * This test case checks the content received for the constructor java doc.
+     */
+    @Test
+    public void constructorGenerationTest() {
+        String constructorDoc = getJavaDoc(CONSTRUCTOR, TEST_NAME, false, getStubPluginConfig());
+        assertThat(true,
+                is(constructorDoc.contains("Creates an instance of ")
+                        && constructorDoc.contains("builder object of")
+                        && constructorDoc.contains("@param") && constructorDoc.contains("*/\n")));
+    }
+
+    /**
+     * This test case checks the content received for the default constructor java doc.
+     */
+    @Test
+    public void defaultConstructorGenerationTest() {
+        String defaultConstructorDoc = getJavaDoc(DEFAULT_CONSTRUCTOR, TEST_NAME, false, getStubPluginConfig());
+        assertThat(true, is(defaultConstructorDoc.contains("Creates an instance of ")
+                && defaultConstructorDoc.contains(END_STRING)));
+    }
+
+    /**
+     * This test case checks the content received for the getter java doc.
+     */
+    @Test
+    public void getterGenerationTest() {
+        String getterJavaDoc = getJavaDoc(GETTER_METHOD, TEST_NAME, false, getStubPluginConfig());
+        assertThat(true,
+                is(getterJavaDoc.contains("Returns the attribute") && getterJavaDoc.contains(END_STRING)));
+    }
+
+    /**
+     * This test case checks the content received for the impl class java doc.
+     */
+    @Test
+    public void implClassGenerationTest() {
+        String implClassJavaDoc = getJavaDoc(IMPL_CLASS, TEST_NAME, false, getStubPluginConfig());
+        assertThat(true,
+                is(implClassJavaDoc.contains("Represents the implementation of")
+                        && implClassJavaDoc.contains(END_STRING)));
+    }
+
+    /**
+     * This test case checks the content received for the interface java doc.
+     */
+    @Test
+    public void interfaceGenerationTest() {
+        String interfaceJavaDoc = getJavaDoc(INTERFACE, TEST_NAME, false, getStubPluginConfig());
+        assertThat(true,
+                is(interfaceJavaDoc.contains("Abstraction of an entity which represents the functionality of")
+                        && interfaceJavaDoc.contains(END_STRING)));
+    }
+
+    /**
+     * This test case checks the content received for the package info  java doc.
+     */
+    @Test
+    public void packageInfoGenerationTest() {
+        String packageInfo = getJavaDoc(PACKAGE_INFO, TEST_NAME, false, getStubPluginConfig());
+        assertThat(true,
+                is(packageInfo.contains("Implementation of YANG node") && packageInfo.contains(END_STRING)));
+    }
+
+    /**
+     * This test case checks the content received for the package info  java doc.
+     */
+    @Test
+    public void packageInfoGenerationForChildNodeTest() {
+        String packageInfo = getJavaDoc(PACKAGE_INFO, TEST_NAME, true, getStubPluginConfig());
+        assertThat(true, is(packageInfo.contains("Implementation of YANG node testName's children nodes")
+                && packageInfo.contains(END_STRING)));
+    }
+
+    /**
+     * This test case checks the content received for the setter java doc.
+     */
+    @Test
+    public void setterGenerationTest() {
+        String setterJavaDoc = getJavaDoc(SETTER_METHOD, TEST_NAME, false, getStubPluginConfig());
+        assertThat(true,
+                is(setterJavaDoc.contains("Returns the builder object of") && setterJavaDoc.contains(END_STRING)));
+    }
+
+    /**
+     * This test case checks the content received for the typedef setter java doc.
+     */
+    @Test
+    public void typeDefSetterGenerationTest() {
+        String typeDefSetter = getJavaDoc(TYPE_DEF_SETTER_METHOD, TEST_NAME, false, getStubPluginConfig());
+        assertThat(true, is(typeDefSetter.contains("Sets the value of") && typeDefSetter.contains(END_STRING)));
+    }
+
+    /**
+     * Returns stub pluginConfig.
+     *
+     * @return stub pluginConfig
+     */
+    private YangPluginConfig getStubPluginConfig() {
+        YangPluginConfig pluginConfig = new YangPluginConfig();
+        pluginConfig.setConflictResolver(null);
+        return pluginConfig;
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/utils/io/impl/YangFileScannerTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/utils/io/impl/YangFileScannerTest.java
new file mode 100644
index 0000000..566d24b
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/utils/io/impl/YangFileScannerTest.java
@@ -0,0 +1,166 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.utils.io.impl;
+
+import java.io.File;
+import java.io.IOException;
+import java.lang.reflect.Constructor;
+import java.lang.reflect.InvocationTargetException;
+import java.util.LinkedList;
+import java.util.List;
+
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+
+import static java.io.File.separator;
+
+import static org.apache.commons.io.FileUtils.deleteDirectory;
+import static org.hamcrest.core.Is.is;
+import static org.hamcrest.core.IsNot.not;
+import static org.junit.Assert.assertThat;
+import static org.onosproject.yangutils.utils.io.impl.YangFileScanner.getJavaFiles;
+import static org.onosproject.yangutils.utils.io.impl.YangFileScanner.getYangFiles;
+
+/**
+ * Test the file scanner service.
+ */
+public final class YangFileScannerTest {
+
+    @Rule
+    public ExpectedException thrown = ExpectedException.none();
+
+    String baseDir = "target/UnitTestCase";
+
+    /**
+     * A private constructor is tested.
+     *
+     * @throws SecurityException         if any security violation is observed
+     * @throws NoSuchMethodException     if when the method is not found
+     * @throws IllegalArgumentException  if there is illegal argument found
+     * @throws InstantiationException    if instantiation is provoked for the private constructor
+     * @throws IllegalAccessException    if instance is provoked or a method is provoked
+     * @throws InvocationTargetException when an exception occurs by the method or constructor
+     */
+    @Test
+    public void callPrivateConstructors() throws SecurityException, NoSuchMethodException, IllegalArgumentException,
+            InstantiationException, IllegalAccessException, InvocationTargetException {
+
+        Class<?>[] classesToConstruct = {YangFileScanner.class };
+        for (Class<?> clazz : classesToConstruct) {
+            Constructor<?> constructor = clazz.getDeclaredConstructor();
+            constructor.setAccessible(true);
+            assertThat(null, not(constructor.newInstance()));
+        }
+    }
+
+    /**
+     * This test case checks for a .java file inside the specified dir.
+     *
+     * @throws IOException when fails to do IO operations
+     */
+    @Test
+    public void checkJavaFileInsideDirTest() throws IOException {
+
+        String dir = baseDir + separator + "scanner2";
+        File path = createDirectory(dir);
+        createFile(path, "testScanner.java");
+        List<String> dirContents = getJavaFiles(path.toString());
+        List<String> expectedContents = new LinkedList<>();
+        expectedContents.add(path.getCanonicalPath() + separator + "testScanner.java");
+        assertThat(true, is(dirContents.equals(expectedContents)));
+        deleteDirectory(path);
+    }
+
+    /**
+     * Method used for creating multiple directories inside the target file.
+     *
+     * @param path where directories should be created
+     * @return the directory path that is created
+     */
+    private File createDirectory(String path) {
+
+        File myDir = new File(path);
+        myDir.mkdirs();
+        return myDir;
+    }
+
+    /**
+     * Method used for creating file inside the specified directory.
+     *
+     * @param myDir    the path where file has to be created inside
+     * @param fileName the name of the file to be created
+     */
+    private void createFile(File myDir, String fileName) throws IOException {
+
+        File file = null;
+        file = new File(myDir + separator + fileName);
+        file.createNewFile();
+    }
+
+    /**
+     * This testcase checks for a java file inside an empty directory.
+     *
+     * @throws IOException when fails to do IO operations
+     */
+    @Test
+    public void emptyDirJavaScannerTest() throws IOException {
+
+        String emptyDir = baseDir + separator + "scanner1";
+        File path = createDirectory(emptyDir);
+        List<String> emptyDirContents = getJavaFiles(path.toString());
+        List<String> expectedContents = new LinkedList<>();
+        assertThat(true, is(emptyDirContents.equals(expectedContents)));
+        deleteDirectory(path);
+    }
+
+    /**
+     * This testcase checks for a yang file inside an empty directory.
+     *
+     * @throws IOException when fails to do IO operations
+     */
+    @Test
+    public void emptyDirYangScannerTest() throws IOException {
+
+        String emptyYangDir = baseDir + separator + "scanner1";
+        File path = createDirectory(emptyYangDir);
+        List<String> emptyDirContents = getYangFiles(path.toString());
+        List<String> expectedContents = new LinkedList<>();
+        assertThat(true, is(emptyDirContents.equals(expectedContents)));
+        deleteDirectory(path);
+    }
+
+    /**
+     * This test case checks with the sub directories in the given path for java files.
+     *
+     * @throws IOException when fails to do IO operations
+     */
+    @Test
+    public void emptySubDirScannerTest() throws IOException {
+
+        String dir = baseDir + separator + "scanner3";
+        File path = createDirectory(dir);
+        String subDir = path.toString() + separator + "subDir1";
+        createDirectory(subDir);
+        createFile(path, "invalidFile.txt");
+        List<String> emptySubDirContents = getJavaFiles(path.toString());
+        List<String> expectedContents = new LinkedList<>();
+        assertThat(true, is(emptySubDirContents.equals(expectedContents)));
+        deleteDirectory(path);
+    }
+
+}
diff --git a/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/utils/io/impl/YangIoUtilsTest.java b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/utils/io/impl/YangIoUtilsTest.java
new file mode 100644
index 0000000..c10ed03
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/java/org/onosproject/yangutils/utils/io/impl/YangIoUtilsTest.java
@@ -0,0 +1,227 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.utils.io.impl;
+
+import java.io.File;
+import java.io.IOException;
+import java.lang.reflect.Constructor;
+import java.lang.reflect.InvocationTargetException;
+
+import org.apache.commons.io.FileUtils;
+import org.apache.maven.project.MavenProject;
+import org.junit.Rule;
+import org.junit.Test;
+import org.junit.rules.ExpectedException;
+import org.onosproject.yangutils.translator.tojava.utils.YangPluginConfig;
+import org.onosproject.yangutils.utils.UtilConstants;
+import org.sonatype.plexus.build.incremental.BuildContext;
+import org.sonatype.plexus.build.incremental.DefaultBuildContext;
+
+import static org.apache.commons.io.FileUtils.deleteDirectory;
+import static org.hamcrest.core.Is.is;
+import static org.hamcrest.core.IsNot.not;
+import static org.junit.Assert.assertThat;
+import static org.onosproject.yangutils.utils.io.impl.YangIoUtils.addPackageInfo;
+import static org.onosproject.yangutils.utils.io.impl.YangIoUtils.addToCompilationRoot;
+import static org.onosproject.yangutils.utils.io.impl.YangIoUtils.deleteDirectory;
+import static org.onosproject.yangutils.utils.io.impl.YangIoUtils.createDirectories;
+import static org.onosproject.yangutils.utils.io.impl.YangIoUtils.trimAtLast;
+
+/**
+ * Unit tests for YANG IO utils.
+ */
+public final class YangIoUtilsTest {
+
+    private static final String BASE_DIR = "target/UnitTestCase";
+    private static final String CREATE_PATH = BASE_DIR + File.separator + "dir1/dir2/dir3/dir4/";
+    private static final String CHECK_STRING = "one, two, three, four, five, six";
+    private static final String TRIM_STRING = "one, two, three, four, five, ";
+    private static final String CHECK1 = "check1";
+    private static final String PKG_INFO = "package-info.java";
+    private static final String PATH = "src/main/yangmodel/";
+    private static final String MSG = "Exception occured while creating package info file.";
+
+    /**
+     * Expected exceptions.
+     */
+    @Rule
+    public ExpectedException thrown = ExpectedException.none();
+
+    /**
+     * This test case checks whether the package-info file is created.
+     *
+     * @throws IOException when fails to do IO operations for test case
+     */
+    @Test
+    public void addPackageInfoTest() throws IOException {
+
+        File dirPath = new File(CREATE_PATH);
+        dirPath.mkdirs();
+        addPackageInfo(dirPath, CHECK1, CREATE_PATH, false, getStubPluginConfig());
+        File filePath = new File(dirPath + File.separator + PKG_INFO);
+        assertThat(filePath.isFile(), is(true));
+        FileUtils.deleteDirectory(dirPath);
+    }
+
+    /**
+     * This test case checks with an additional info in the path.
+     *
+     * @throws IOException when fails to do IO operations for test case
+     */
+    @Test
+    public void addPackageInfoWithPathTest() throws IOException {
+
+        File dirPath = new File(CREATE_PATH);
+        dirPath.mkdirs();
+        addPackageInfo(dirPath, CHECK1, PATH + CREATE_PATH, false, getStubPluginConfig());
+        File filePath = new File(dirPath + File.separator + PKG_INFO);
+        assertThat(filePath.isFile(), is(true));
+        FileUtils.deleteDirectory(dirPath);
+    }
+
+    /**
+     * This test case checks with a child node.
+     *
+     * @throws IOException when fails to do IO operations for test case
+     */
+    @Test
+    public void addPackageInfoWithChildNode() throws IOException {
+
+        File dirPath = new File(CREATE_PATH);
+        dirPath.mkdirs();
+        addPackageInfo(dirPath, CHECK1, PATH + CREATE_PATH, true, getStubPluginConfig());
+        File filePath = new File(dirPath + File.separator + PKG_INFO);
+        assertThat(filePath.isFile(), is(true));
+        FileUtils.deleteDirectory(dirPath);
+    }
+
+    /**
+     * This test case checks whether the package-info file is created when invalid path is given.
+     *
+     * @throws IOException when fails to do IO operations for test case
+     */
+    @Test
+    public void addPackageInfoWithEmptyPathTest() throws IOException {
+
+        File dirPath = new File("invalid/check");
+        thrown.expect(IOException.class);
+        thrown.expectMessage(MSG);
+        addPackageInfo(dirPath, CHECK1, CREATE_PATH, false, getStubPluginConfig());
+        File filePath1 = new File(dirPath + File.separator + PKG_INFO);
+        assertThat(filePath1.isFile(), is(false));
+        FileUtils.deleteDirectory(dirPath);
+    }
+
+    /**
+     * A private constructor is tested.
+     *
+     * @throws SecurityException if any security violation is observed
+     * @throws NoSuchMethodException if when the method is not found
+     * @throws IllegalArgumentException if there is illegal argument found
+     * @throws InstantiationException if instantiation is provoked for the private constructor
+     * @throws IllegalAccessException if instance is provoked or a method is provoked
+     * @throws InvocationTargetException when an exception occurs by the method or constructor
+     */
+    @Test
+    public void callPrivateConstructors()
+            throws SecurityException, NoSuchMethodException, IllegalArgumentException,
+            InstantiationException, IllegalAccessException, InvocationTargetException {
+
+        Class<?>[] classesToConstruct = {YangIoUtils.class };
+        for (Class<?> clazz : classesToConstruct) {
+            Constructor<?> constructor = clazz.getDeclaredConstructor();
+            constructor.setAccessible(true);
+            assertThat(null, not(constructor.newInstance()));
+        }
+    }
+
+    /**
+     * This test case checks if the directory is cleaned.
+     *
+     * @throws IOException when fails to do IO operations for test case
+     */
+    @Test
+    public void cleanGeneratedDirTest() throws IOException {
+
+        File baseDirPath = new File(BASE_DIR);
+        File createNewDir = new File(BASE_DIR + File.separator + UtilConstants.YANG_GEN_DIR);
+        createNewDir.mkdirs();
+        File createFile = new File(createNewDir + File.separator + "check1.java");
+        createFile.createNewFile();
+        deleteDirectory(baseDirPath.getAbsolutePath());
+        FileUtils.deleteDirectory(createNewDir);
+        FileUtils.deleteDirectory(baseDirPath);
+    }
+
+    /**
+     * This test case checks the cleaning method when an invalid path is provided.
+     *
+     * @throws IOException when fails to do IO operations for test case
+     */
+    @Test
+    public void cleanWithInvalidDirTest() throws IOException {
+
+        File baseDirPath = new File(BASE_DIR + "invalid");
+        deleteDirectory(baseDirPath.getAbsolutePath());
+    }
+
+    /**
+     * This test case tests whether the directories are getting created.
+     */
+    @Test
+    public void createDirectoryTest() throws IOException {
+
+        File dirPath = createDirectories(CREATE_PATH);
+        assertThat(dirPath.isDirectory(), is(true));
+        FileUtils.deleteDirectory(dirPath);
+    }
+
+    /**
+     * This test case checks whether the source is getting added.
+     */
+    @Test
+    public void testForAddSource() throws IOException {
+
+        MavenProject project = new MavenProject();
+        BuildContext context = new DefaultBuildContext();
+        File sourceDir = new File(BASE_DIR + File.separator + "yang");
+        sourceDir.mkdirs();
+        addToCompilationRoot(sourceDir.toString(), project, context);
+        FileUtils.deleteDirectory(sourceDir);
+    }
+
+    /**
+     * Unit test case for trim at last method.
+     */
+    @Test
+    public void testForTrimAtLast() {
+
+        String test = trimAtLast(CHECK_STRING, "six");
+        assertThat(test.contains(TRIM_STRING), is(true));
+    }
+
+    /**
+     * Returns stub pluginConfig.
+     *
+     * @return stub pluginConfig
+     */
+    private YangPluginConfig getStubPluginConfig() {
+        YangPluginConfig pluginConfig = new YangPluginConfig();
+        pluginConfig.setConflictResolver(null);
+        return pluginConfig;
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/AnyxmlStatement.yang b/utils/yangutils/plugin/src/test/resources/AnyxmlStatement.yang
new file mode 100644
index 0000000..4b1e421
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/AnyxmlStatement.yang
@@ -0,0 +1,16 @@
+module event {
+
+    namespace "http://example.com/event";
+    prefix "ev";
+
+    notification event {
+        leaf event-class {
+            type string;
+        }
+        anyxml reporting-entity;
+        leaf severity {
+            type string;
+        }
+    }
+}
+
diff --git a/utils/yangutils/plugin/src/test/resources/BelongsToDualPrefix.yang b/utils/yangutils/plugin/src/test/resources/BelongsToDualPrefix.yang
new file mode 100644
index 0000000..37973da
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/BelongsToDualPrefix.yang
@@ -0,0 +1,8 @@
+submodule Test {
+yang-version 1;
+belongs-to ONOS {
+prefix On1;
+prefix On2;
+}
+}
+
diff --git a/utils/yangutils/plugin/src/test/resources/BelongsToWithPrefix.yang b/utils/yangutils/plugin/src/test/resources/BelongsToWithPrefix.yang
new file mode 100644
index 0000000..75a13ca
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/BelongsToWithPrefix.yang
@@ -0,0 +1,6 @@
+submodule Test {
+yang-version 1;
+belongs-to ONOS {
+prefix On1;
+}
+}
diff --git a/utils/yangutils/plugin/src/test/resources/BelongsToWithoutPrefix.yang b/utils/yangutils/plugin/src/test/resources/BelongsToWithoutPrefix.yang
new file mode 100644
index 0000000..eaf9885
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/BelongsToWithoutPrefix.yang
@@ -0,0 +1,6 @@
+submodule Test {
+yang-version 1;
+belongs-to ONOS {
+}
+}
+
diff --git a/utils/yangutils/plugin/src/test/resources/BitTypeStatement.yang b/utils/yangutils/plugin/src/test/resources/BitTypeStatement.yang
new file mode 100644
index 0000000..9d13495
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/BitTypeStatement.yang
@@ -0,0 +1,12 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+     leaf mybits {
+         type bits {
+             bit disable-nagle;
+             bit auto-sense-speed;
+             bit Ten-Mb-only;
+         }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/BitTypedefStatement.yang b/utils/yangutils/plugin/src/test/resources/BitTypedefStatement.yang
new file mode 100644
index 0000000..d3dc26a
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/BitTypedefStatement.yang
@@ -0,0 +1,18 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    typedef type15 { 
+        type bits {
+             bit disable-nagle {
+                 position 0;
+             }
+             bit auto-sense-speed {
+                 position 1;
+             }
+             bit Mb-only {
+                 position 2;
+             }
+         }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/BitUnionStatement.yang b/utils/yangutils/plugin/src/test/resources/BitUnionStatement.yang
new file mode 100644
index 0000000..dd62eae
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/BitUnionStatement.yang
@@ -0,0 +1,20 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf type15 { 
+        type union {
+            type bits {
+                bit disable-nagle {
+                    position 0;
+                }
+                bit auto-sense-speed {
+                    position 1;
+                }
+                bit Mb-only {
+                    position 2;
+                }
+            }
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/BitWithDuplicateName.yang b/utils/yangutils/plugin/src/test/resources/BitWithDuplicateName.yang
new file mode 100644
index 0000000..ed5cc32
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/BitWithDuplicateName.yang
@@ -0,0 +1,12 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+     leaf mybits {
+         type bits {
+             bit disable-nagle;
+             bit disable-nagle;
+             bit Ten-Mb-only;
+         }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/CaseChoiceHierarchy.yang b/utils/yangutils/plugin/src/test/resources/CaseChoiceHierarchy.yang
new file mode 100644
index 0000000..28d110e
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/CaseChoiceHierarchy.yang
@@ -0,0 +1,23 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    container food {
+        choice snack {
+            case sports-arena {
+                leaf pretzel {
+                    type empty;
+                }
+            }
+            case late-night {
+                choice dinner {
+                    case late-night {
+                        leaf beer {
+                            type empty;
+                        }
+                    }
+                }
+            }
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/CaseStatement.yang b/utils/yangutils/plugin/src/test/resources/CaseStatement.yang
new file mode 100644
index 0000000..bb3f6c9
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/CaseStatement.yang
@@ -0,0 +1,26 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+     container food {
+       choice snack {
+           case sports-arena {
+               leaf pretzel {
+                   type empty;
+               }
+               leaf beer {
+                   type empty;
+               }
+           }
+           case late-night {
+               leaf chocolate {
+                   type enumeration {
+                       enum dark;
+                       enum milk;
+                       enum first-available;
+                   }
+               }
+           }
+       }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/CaseStatementSameEntryDifferentChoice.yang b/utils/yangutils/plugin/src/test/resources/CaseStatementSameEntryDifferentChoice.yang
new file mode 100644
index 0000000..b42cdf9
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/CaseStatementSameEntryDifferentChoice.yang
@@ -0,0 +1,28 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+     container food {
+       choice snack {
+           case sports-arena {
+               leaf pretzel {
+                   type empty;
+               }
+               leaf beer {
+                   type empty;
+               }
+           }
+       }
+       choice lunch {
+           case sports-arena {
+               leaf chocolate {
+                   type enumeration {
+                       enum dark;
+                       enum milk;
+                       enum first-available;
+                   }
+               }
+           }
+       }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/ChoiceCaseTranslator.yang b/utils/yangutils/plugin/src/test/resources/ChoiceCaseTranslator.yang
new file mode 100644
index 0000000..e8127ea
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ChoiceCaseTranslator.yang
@@ -0,0 +1,22 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    container food {
+       choice snack {
+           case sports-arena {
+               leaf pretzel {
+                   type string;
+               }
+               leaf beer {
+                   type string;
+               }
+           }
+           case late-night {
+               leaf chocolate {
+                   type string;
+               }
+           }
+       }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/ChoiceStatementDuplicateEntry.yang b/utils/yangutils/plugin/src/test/resources/ChoiceStatementDuplicateEntry.yang
new file mode 100644
index 0000000..d2a6371
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ChoiceStatementDuplicateEntry.yang
@@ -0,0 +1,10 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+     container food {
+       choice snack;
+       choice lunch;
+       choice snack;
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/ChoiceStatementSameEntryDifferentContainer.yang b/utils/yangutils/plugin/src/test/resources/ChoiceStatementSameEntryDifferentContainer.yang
new file mode 100644
index 0000000..39ba626
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ChoiceStatementSameEntryDifferentContainer.yang
@@ -0,0 +1,13 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+     container food1 {
+       choice snack;
+       choice lunch;
+    }
+     container food2 {
+       choice snack;
+       choice lunch;
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/ChoiceStatementWithStmtend.yang b/utils/yangutils/plugin/src/test/resources/ChoiceStatementWithStmtend.yang
new file mode 100644
index 0000000..4b85f59
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ChoiceStatementWithStmtend.yang
@@ -0,0 +1,8 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+     container food {
+       choice snack;
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/ChoiceStatementWithoutBody.yang b/utils/yangutils/plugin/src/test/resources/ChoiceStatementWithoutBody.yang
new file mode 100644
index 0000000..2de7787
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ChoiceStatementWithoutBody.yang
@@ -0,0 +1,9 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+     container food {
+       choice snack {
+       }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/ChoiceSubStatementDefault.yang b/utils/yangutils/plugin/src/test/resources/ChoiceSubStatementDefault.yang
new file mode 100644
index 0000000..b9fd60d
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ChoiceSubStatementDefault.yang
@@ -0,0 +1,23 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    container food {
+       choice snack {
+           case sports-arena {
+               leaf pretzel {
+                   type string;
+               }
+               leaf beer {
+                   type string;
+               }
+           }
+           case late-night {
+               leaf chocolate {
+                   type string;
+               }
+           }
+           default "hello";
+       }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/ConfigDefaultValue.yang b/utils/yangutils/plugin/src/test/resources/ConfigDefaultValue.yang
new file mode 100644
index 0000000..7e19946
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ConfigDefaultValue.yang
@@ -0,0 +1,15 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    container valid {
+        leaf invalid-interval {
+            type "uint16";
+            units "seconds";
+            description "Interval before a route is declared invalid";
+            mandatory true;
+            status current;
+            reference "RFC 6020";
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/ConfigEmptyValue.yang b/utils/yangutils/plugin/src/test/resources/ConfigEmptyValue.yang
new file mode 100644
index 0000000..0d62956
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ConfigEmptyValue.yang
@@ -0,0 +1,9 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf invalid-interval {
+        type "uint16";
+        config ;
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/ConfigFalse.yang b/utils/yangutils/plugin/src/test/resources/ConfigFalse.yang
new file mode 100644
index 0000000..79dc5ac
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ConfigFalse.yang
@@ -0,0 +1,14 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf invalid-interval {
+        type "uint16";
+        units "seconds";
+        description "Interval before a route is declared invalid";
+        config false;
+        mandatory true;
+        status current;
+        reference "RFC 6020";
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/ConfigFalseNoKey.yang b/utils/yangutils/plugin/src/test/resources/ConfigFalseNoKey.yang
new file mode 100644
index 0000000..66f141e
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ConfigFalseNoKey.yang
@@ -0,0 +1,14 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    list valid {
+        config false;
+        leaf invalid-interval {
+            type "string";
+            units "seconds";
+            status current;
+            reference "RFC 6020";
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/ConfigFalseParentContainerChildLeaf.yang b/utils/yangutils/plugin/src/test/resources/ConfigFalseParentContainerChildLeaf.yang
new file mode 100644
index 0000000..ecc0806
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ConfigFalseParentContainerChildLeaf.yang
@@ -0,0 +1,15 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    container valid {
+        config false;
+        leaf invalid-interval {
+            type "uint16";
+            units "seconds";
+            status current;
+            config true;
+            reference "RFC 6020";
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/ConfigFalseParentContainerChildLeafList.yang b/utils/yangutils/plugin/src/test/resources/ConfigFalseParentContainerChildLeafList.yang
new file mode 100644
index 0000000..e3c7836
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ConfigFalseParentContainerChildLeafList.yang
@@ -0,0 +1,15 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    container valid {
+        config false;
+        leaf-list invalid-interval {
+            type "uint16";
+            units "seconds";
+            status current;
+            config true;
+            reference "RFC 6020";
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/ConfigFalseParentContainerChildList.yang b/utils/yangutils/plugin/src/test/resources/ConfigFalseParentContainerChildList.yang
new file mode 100644
index 0000000..ffc6f60
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ConfigFalseParentContainerChildList.yang
@@ -0,0 +1,18 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    container valid {
+        config false;
+        list valid {
+            key "invalid-interval";
+            config true;
+            leaf invalid-interval {
+                type "uint16";
+                units "seconds";
+                status current;
+                reference "RFC 6020";
+            }
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/ConfigFalseParentListChildContainer.yang b/utils/yangutils/plugin/src/test/resources/ConfigFalseParentListChildContainer.yang
new file mode 100644
index 0000000..3158dd4
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ConfigFalseParentListChildContainer.yang
@@ -0,0 +1,24 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    list valid {
+        config false;
+        key "invalid-interval";
+        leaf invalid-interval {
+            type "uint16";
+            units "seconds";
+            status current;
+            reference "RFC 6020";
+        }
+        container valid {
+            config true;
+            leaf invalid-interval {
+                type "uint16";
+                units "seconds";
+                status current;
+                reference "RFC 6020";
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/ConfigFalseParentListChildLeaf.yang b/utils/yangutils/plugin/src/test/resources/ConfigFalseParentListChildLeaf.yang
new file mode 100644
index 0000000..65171dd
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ConfigFalseParentListChildLeaf.yang
@@ -0,0 +1,16 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    list valid {
+        key "invalid-interval";
+        config false;
+        leaf invalid-interval {
+            type "uint16";
+            config true;
+            units "seconds";
+            status current;
+            reference "RFC 6020";
+        }
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/ConfigFalseParentListChildLeafList.yang b/utils/yangutils/plugin/src/test/resources/ConfigFalseParentListChildLeafList.yang
new file mode 100644
index 0000000..33132cd
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ConfigFalseParentListChildLeafList.yang
@@ -0,0 +1,16 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    list valid {
+        key "invalid-interval";
+        config false;
+        leaf-list invalid-interval {
+            type "uint16";
+            config true;
+            units "seconds";
+            status current;
+            reference "RFC 6020";
+        }
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/ConfigFalseValidKeyValidLeaf.yang b/utils/yangutils/plugin/src/test/resources/ConfigFalseValidKeyValidLeaf.yang
new file mode 100644
index 0000000..368a4b5
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ConfigFalseValidKeyValidLeaf.yang
@@ -0,0 +1,15 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    list valid {
+        key "invalid-interval";
+        config false;
+        leaf invalid-interval {
+            type "string";
+            units "seconds";
+            status current;
+            reference "RFC 6020";
+        }
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/ConfigFalseValidKeyValidLeafList.yang b/utils/yangutils/plugin/src/test/resources/ConfigFalseValidKeyValidLeafList.yang
new file mode 100644
index 0000000..4196be4
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ConfigFalseValidKeyValidLeafList.yang
@@ -0,0 +1,14 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    list valid {
+        key "invalid-interval";
+        leaf-list invalid-interval {
+            type "string";
+            units "seconds";
+            status current;
+            reference "RFC 6020";
+        }
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/ConfigInvalidValue.yang b/utils/yangutils/plugin/src/test/resources/ConfigInvalidValue.yang
new file mode 100644
index 0000000..b2e7659
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ConfigInvalidValue.yang
@@ -0,0 +1,9 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf invalid-interval {
+        type "uint16";
+        config invalid;
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/ConfigTrue.yang b/utils/yangutils/plugin/src/test/resources/ConfigTrue.yang
new file mode 100644
index 0000000..70349a0
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ConfigTrue.yang
@@ -0,0 +1,14 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf invalid-interval {
+        type "uint16";
+        units "seconds";
+        description "Interval before a route is declared invalid";
+        config true;
+        mandatory true;
+        status current;
+        reference "RFC 6020";
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/ConfigTrueNoKey.yang b/utils/yangutils/plugin/src/test/resources/ConfigTrueNoKey.yang
new file mode 100644
index 0000000..7a0a538
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ConfigTrueNoKey.yang
@@ -0,0 +1,14 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    list valid {
+        config true;
+        leaf invalid-interval {
+            type "string";
+            units "seconds";
+            status current;
+            reference "RFC 6020";
+        }
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/ConfigTrueNoleafNoLeafList.yang b/utils/yangutils/plugin/src/test/resources/ConfigTrueNoleafNoLeafList.yang
new file mode 100644
index 0000000..c553e60
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ConfigTrueNoleafNoLeafList.yang
@@ -0,0 +1,13 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    list valid {
+        config true;
+        container container1 {
+           leaf leaf1 {
+              type "string";
+           }
+        }
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/ConfigTrueValidKeyValidLeaf.yang b/utils/yangutils/plugin/src/test/resources/ConfigTrueValidKeyValidLeaf.yang
new file mode 100644
index 0000000..fe8efe3
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ConfigTrueValidKeyValidLeaf.yang
@@ -0,0 +1,14 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    list valid {
+        key "invalid-interval";
+        leaf invalid-interval {
+            type "string";
+            units "seconds";
+            status current;
+            reference "RFC 6020";
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/ConfigTrueValidKeyValidLeafList.yang b/utils/yangutils/plugin/src/test/resources/ConfigTrueValidKeyValidLeafList.yang
new file mode 100644
index 0000000..4196be4
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ConfigTrueValidKeyValidLeafList.yang
@@ -0,0 +1,14 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    list valid {
+        key "invalid-interval";
+        leaf-list invalid-interval {
+            type "string";
+            units "seconds";
+            status current;
+            reference "RFC 6020";
+        }
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/ConfigWithoutStatementEnd.yang b/utils/yangutils/plugin/src/test/resources/ConfigWithoutStatementEnd.yang
new file mode 100644
index 0000000..0ae02af
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ConfigWithoutStatementEnd.yang
@@ -0,0 +1,9 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf invalid-interval {
+        type "uint16";
+        config false
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/ContactDualEntryTest.yang b/utils/yangutils/plugin/src/test/resources/ContactDualEntryTest.yang
new file mode 100644
index 0000000..2dca10e
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ContactDualEntryTest.yang
@@ -0,0 +1,9 @@
+module Test {
+yang-version 1;
+namespace urn:ietf:params:xml:ns:yang:ietf-ospf;
+prefix On;
+organization "IETF SPRING Working Group";
+contact "WG List";
+contact "Invalid";
+}
+
diff --git a/utils/yangutils/plugin/src/test/resources/ContactIncorrectOrder.yang b/utils/yangutils/plugin/src/test/resources/ContactIncorrectOrder.yang
new file mode 100644
index 0000000..237d003
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ContactIncorrectOrder.yang
@@ -0,0 +1,7 @@
+module Test {
+yang-version 1;
+contact "Test";
+namespace urn:ietf:params:xml:ns:yang:ietf-ospf;
+prefix On;
+organization "IETF SPRING Working Group";
+}
diff --git a/utils/yangutils/plugin/src/test/resources/ContactValidEntry.yang b/utils/yangutils/plugin/src/test/resources/ContactValidEntry.yang
new file mode 100644
index 0000000..f88e147
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ContactValidEntry.yang
@@ -0,0 +1,9 @@
+module Test {
+yang-version 1;
+namespace urn:ietf:params:xml:ns:yang:ietf-ospf;
+prefix On;
+organization "IETF SPRING Working Group";
+contact "WG List:  <mailto:spring@ietf.org>
+Editor:    Stephane Litkowski
+           <mailto:stephane.litkowski@orange.com>";
+}
diff --git a/utils/yangutils/plugin/src/test/resources/ContactWithEmptyString.yang b/utils/yangutils/plugin/src/test/resources/ContactWithEmptyString.yang
new file mode 100644
index 0000000..34c6008
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ContactWithEmptyString.yang
@@ -0,0 +1,7 @@
+module Test {
+yang-version 1;
+namespace urn:ietf:params:xml:ns:yang:ietf-ospf;
+prefix On;
+organization "IETF SPRING Working Group";
+contact;
+}
diff --git a/utils/yangutils/plugin/src/test/resources/ContactWithoutQuotes.yang b/utils/yangutils/plugin/src/test/resources/ContactWithoutQuotes.yang
new file mode 100644
index 0000000..20ab72b
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ContactWithoutQuotes.yang
@@ -0,0 +1,8 @@
+module Test {
+yang-version 1;
+namespace urn:ietf:params:xml:ns:yang:ietf-ospf;
+prefix On;
+organization "IETF SPRING Working Group";
+contact WG;
+}
+
diff --git a/utils/yangutils/plugin/src/test/resources/ContainerDuplicateContainer.yang b/utils/yangutils/plugin/src/test/resources/ContainerDuplicateContainer.yang
new file mode 100644
index 0000000..4928463
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ContainerDuplicateContainer.yang
@@ -0,0 +1,23 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    container ospf {
+        container valid {
+            leaf invalid-interval {
+                type "uint16";
+                units "seconds";
+                status current;
+                reference "RFC 6020";
+            }
+        }
+        container valid {
+            leaf invalid-interval {
+                type "uint16";
+                units "seconds";
+                status current;
+                reference "RFC 6020";
+            }
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/ContainerInvalidIdentifier.yang b/utils/yangutils/plugin/src/test/resources/ContainerInvalidIdentifier.yang
new file mode 100644
index 0000000..eee1acd
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ContainerInvalidIdentifier.yang
@@ -0,0 +1,14 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    container 1valid {
+        reference "RFC 6020";
+        leaf invalid-interval {
+            type "uint16";
+            units "seconds";
+            status current;
+            reference "RFC 6020";
+        }
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/ContainerRootNode.yang b/utils/yangutils/plugin/src/test/resources/ContainerRootNode.yang
new file mode 100644
index 0000000..441d717
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ContainerRootNode.yang
@@ -0,0 +1,9 @@
+container valid {
+    reference "RFC 6020";
+    leaf invalid-interval {
+        type "uint16";
+        units "seconds";
+        status current;
+        reference "RFC 6020";
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/ContainerSubStatementCardinality.yang b/utils/yangutils/plugin/src/test/resources/ContainerSubStatementCardinality.yang
new file mode 100644
index 0000000..731e389
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ContainerSubStatementCardinality.yang
@@ -0,0 +1,15 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    container valid {
+        reference "RFC 6020";
+        reference "RFC 6020";
+        leaf invalid-interval {
+            type "uint16";
+            units "seconds";
+            status current;
+            reference "RFC 6020";
+        }
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/ContainerSubStatementConfig.yang b/utils/yangutils/plugin/src/test/resources/ContainerSubStatementConfig.yang
new file mode 100644
index 0000000..736dcbc
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ContainerSubStatementConfig.yang
@@ -0,0 +1,16 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    container valid {
+        config true;
+        leaf invalid-interval {
+            type "uint16";
+            units "seconds";
+            description "Interval before a route is declared invalid";
+            mandatory true;
+            status current;
+            reference "RFC 6020";
+        }
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/ContainerSubStatementContainer.yang b/utils/yangutils/plugin/src/test/resources/ContainerSubStatementContainer.yang
new file mode 100644
index 0000000..1f9f810
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ContainerSubStatementContainer.yang
@@ -0,0 +1,15 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    container ospf {
+        container valid {
+            leaf invalid-interval {
+                type "uint16";
+                units "seconds";
+                status current;
+                reference "RFC 6020";
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/ContainerSubStatementDescription.yang b/utils/yangutils/plugin/src/test/resources/ContainerSubStatementDescription.yang
new file mode 100644
index 0000000..dc75d00
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ContainerSubStatementDescription.yang
@@ -0,0 +1,18 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    container valid {
+        description "container description";
+        config true;
+        leaf invalid-interval {
+            type "uint16";
+            units "seconds";
+            description "Interval before a route is declared invalid";
+            mandatory true;
+            status current;
+            reference "RFC 6020";
+        }
+    }
+}
+
diff --git a/utils/yangutils/plugin/src/test/resources/ContainerSubStatementLeaf.yang b/utils/yangutils/plugin/src/test/resources/ContainerSubStatementLeaf.yang
new file mode 100644
index 0000000..c9a64e3
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ContainerSubStatementLeaf.yang
@@ -0,0 +1,17 @@
+
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    container valid {
+        leaf invalid-interval {
+            type "uint16";
+            units "seconds";
+            description "Interval before a route is declared invalid";
+            config true;
+            mandatory true;
+            status current;
+            reference "RFC 6020";
+        }
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/ContainerSubStatementLeafList.yang b/utils/yangutils/plugin/src/test/resources/ContainerSubStatementLeafList.yang
new file mode 100644
index 0000000..a1877b6
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ContainerSubStatementLeafList.yang
@@ -0,0 +1,17 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    container valid {
+        leaf-list invalid-interval {
+            type "uint16";
+            units "seconds";
+            description "Interval before a route is declared invalid";
+            config true;
+            min-elements 1;
+            max-elements unbounded;
+            status current;
+            reference "RFC 6020";
+        }
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/ContainerSubStatementList.yang b/utils/yangutils/plugin/src/test/resources/ContainerSubStatementList.yang
new file mode 100644
index 0000000..19810c7
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ContainerSubStatementList.yang
@@ -0,0 +1,16 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    container ospf {
+        list valid {
+            key "invalid-interval";
+            leaf invalid-interval {
+                type "uint16";
+                units "seconds";
+                status current;
+                reference "RFC 6020";
+            }
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/ContainerSubStatementPresence.yang b/utils/yangutils/plugin/src/test/resources/ContainerSubStatementPresence.yang
new file mode 100644
index 0000000..d3a30dc
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ContainerSubStatementPresence.yang
@@ -0,0 +1,14 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    container valid {
+        presence "invalid";
+        leaf invalid-interval {
+            type "uint16";
+            units "seconds";
+            status current;
+            reference "RFC 6020";
+        }
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/ContainerSubStatementReference.yang b/utils/yangutils/plugin/src/test/resources/ContainerSubStatementReference.yang
new file mode 100644
index 0000000..33f37fd
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ContainerSubStatementReference.yang
@@ -0,0 +1,17 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    container valid {
+        reference "container reference";
+        config true;
+        leaf invalid-interval {
+        type "uint16";
+        units "seconds";
+        description "Interval before a route is declared invalid";
+        mandatory true;
+        status current;
+        reference "RFC 6020";
+        }
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/ContainerSubStatementStatus.yang b/utils/yangutils/plugin/src/test/resources/ContainerSubStatementStatus.yang
new file mode 100644
index 0000000..fdf907d
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ContainerSubStatementStatus.yang
@@ -0,0 +1,17 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    container valid {
+        config true;
+        status obsolete;
+        leaf invalid-interval {
+            type "uint16";
+            units "seconds";
+            description "Interval before a route is declared invalid";
+            mandatory true;
+            status current;
+            reference "RFC 6020";
+        }
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/ContainerSubStatements.yang b/utils/yangutils/plugin/src/test/resources/ContainerSubStatements.yang
new file mode 100644
index 0000000..2611f97
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ContainerSubStatements.yang
@@ -0,0 +1,18 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    container ospf {
+        presence "ospf logs";
+        config true;
+        description "container description";
+        status current;
+        reference "container reference";
+        leaf invalid-interval {
+            type "uint16";
+            units "seconds";
+            status current;
+            reference "RFC 6020";
+        }
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/ContainerWithDuplicateLeaf.yang b/utils/yangutils/plugin/src/test/resources/ContainerWithDuplicateLeaf.yang
new file mode 100644
index 0000000..3adaccd
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ContainerWithDuplicateLeaf.yang
@@ -0,0 +1,34 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    container valid {
+        leaf invalid-interval {
+            type "uint16";
+            units "seconds";
+            description "Interval before a route is declared invalid";
+            config true;
+            mandatory true;
+            status current;
+            reference "RFC 6020";
+        }
+        leaf valid-interval {
+            type "uint16";
+            units "seconds";
+            description "Interval before a route is declared invalid";
+            config true;
+            mandatory true;
+            status current;
+            reference "RFC 6020";
+        }
+        leaf valid-interval {
+            type "uint16";
+            units "seconds";
+            description "Interval before a route is declared invalid";
+            config true;
+            mandatory true;
+            status current;
+            reference "RFC 6020";
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/CopyrightHeader.txt b/utils/yangutils/plugin/src/test/resources/CopyrightHeader.txt
new file mode 100644
index 0000000..2cbed45
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/CopyrightHeader.txt
@@ -0,0 +1,14 @@
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
diff --git a/utils/yangutils/plugin/src/test/resources/DerivedTypeStatement.yang b/utils/yangutils/plugin/src/test/resources/DerivedTypeStatement.yang
new file mode 100644
index 0000000..afbfd1d
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/DerivedTypeStatement.yang
@@ -0,0 +1,11 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    import ietf-yang-types {
+             prefix "P";
+         }
+    leaf invalid-interval {
+        type P:hello;
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/DescriptionEmptyStatement.yang b/utils/yangutils/plugin/src/test/resources/DescriptionEmptyStatement.yang
new file mode 100644
index 0000000..f6c1c3d
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/DescriptionEmptyStatement.yang
@@ -0,0 +1,6 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    description "";
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/DescriptionStringConcat.yang b/utils/yangutils/plugin/src/test/resources/DescriptionStringConcat.yang
new file mode 100644
index 0000000..8bf0519
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/DescriptionStringConcat.yang
@@ -0,0 +1,9 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf invalid-interval {
+        type "uint16";
+        description "Interval before a " + "route is declared invalid";
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/DescriptionValidStatement.yang b/utils/yangutils/plugin/src/test/resources/DescriptionValidStatement.yang
new file mode 100644
index 0000000..70349a0
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/DescriptionValidStatement.yang
@@ -0,0 +1,14 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf invalid-interval {
+        type "uint16";
+        units "seconds";
+        description "Interval before a route is declared invalid";
+        config true;
+        mandatory true;
+        status current;
+        reference "RFC 6020";
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/DescriptionWithoutStatementEnd.yang b/utils/yangutils/plugin/src/test/resources/DescriptionWithoutStatementEnd.yang
new file mode 100644
index 0000000..ebd8c24
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/DescriptionWithoutStatementEnd.yang
@@ -0,0 +1,9 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf invalid-interval {
+      type "uint16";
+      description "Interval before a " + "route is declared invalid"
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/DuplicateCaseInChoice.yang b/utils/yangutils/plugin/src/test/resources/DuplicateCaseInChoice.yang
new file mode 100644
index 0000000..a7b6b50
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/DuplicateCaseInChoice.yang
@@ -0,0 +1,26 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+     container food {
+       choice snack {
+           case sports-arena {
+               leaf pretzel {
+                   type empty;
+               }
+               leaf beer {
+                   type empty;
+               }
+           }
+           case sports-arena {
+               leaf chocolate {
+                   type enumeration {
+                       enum dark;
+                       enum milk;
+                       enum first-available;
+                   }
+               }
+           }
+       }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/DuplicateContainerAndList.yang b/utils/yangutils/plugin/src/test/resources/DuplicateContainerAndList.yang
new file mode 100644
index 0000000..74c7721
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/DuplicateContainerAndList.yang
@@ -0,0 +1,29 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    container ospf {
+        container valid {
+            leaf invalid-interval {
+                type "uint16";
+                units "seconds";
+                status current;
+                reference "RFC 6020";
+            }
+        }
+        list valid {
+            key "process-id";
+            container interface {
+                leaf invalid-interval {
+                    type "uint16";
+                    units "seconds";
+                    status current;
+                    reference "RFC 6020";
+                }
+            }
+            leaf process-id {
+                type "string";
+            }
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/DuplicateGroupingInContainer.yang b/utils/yangutils/plugin/src/test/resources/DuplicateGroupingInContainer.yang
new file mode 100644
index 0000000..f130797
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/DuplicateGroupingInContainer.yang
@@ -0,0 +1,23 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    container valid {
+        grouping endpoint {
+            leaf address {
+                type ip-address;
+            }
+            leaf port {
+                type port-number;
+            }
+        }
+        grouping endpoint {
+            leaf address {
+                type ip-address;
+            }
+            leaf port {
+                type port-number;
+            }
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/DuplicateGroupingInList.yang b/utils/yangutils/plugin/src/test/resources/DuplicateGroupingInList.yang
new file mode 100644
index 0000000..a9d1b3b
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/DuplicateGroupingInList.yang
@@ -0,0 +1,36 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    import ietf-yang-types {
+             prefix "P";
+         }
+    list valid {
+        key address;
+        grouping endpoint {
+            description "grouping under test";
+            status current;
+            reference "RFC 6020";
+            leaf address {
+                type ip-address;
+            }
+            leaf port {
+                type port-number;
+            }
+        }
+        leaf address {
+            type ip;
+        }
+        grouping endpoint {
+            description "grouping under test";
+            status current;
+            reference "RFC 6020";
+            leaf address {
+                type ip-address;
+            }
+            leaf port {
+                type port-number;
+            }
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/DuplicateGroupingInModule.yang b/utils/yangutils/plugin/src/test/resources/DuplicateGroupingInModule.yang
new file mode 100644
index 0000000..ec01781
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/DuplicateGroupingInModule.yang
@@ -0,0 +1,24 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    import ietf-yang-types {
+             prefix "P";
+         }
+    grouping endpoint {
+        leaf address {
+            type P:ip-address;
+        }
+        leaf port {
+            type P:port-number;
+        }
+    }
+    grouping endpoint {
+        leaf address {
+            type P:pip-address;
+        }
+        leaf port {
+            type P:port-number;
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/DuplicateLeafInChoice.yang b/utils/yangutils/plugin/src/test/resources/DuplicateLeafInChoice.yang
new file mode 100644
index 0000000..f951c7f
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/DuplicateLeafInChoice.yang
@@ -0,0 +1,21 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+     container food {
+       choice snack {
+           case sports-arena {
+               leaf pretzel {
+                   type empty;
+               }
+               leaf beer {
+                   type empty;
+               }
+           }
+           case late-night {
+               leaf pretzel {
+                   type empty;
+               }
+           }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/DuplicateLeafInHierarchy.yang b/utils/yangutils/plugin/src/test/resources/DuplicateLeafInHierarchy.yang
new file mode 100644
index 0000000..e23f04c
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/DuplicateLeafInHierarchy.yang
@@ -0,0 +1,23 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    container food {
+        choice snack {
+            case sports-arena {
+                leaf pretzel {
+                    type empty;
+                }
+            }
+            case late-night {
+                choice lunch {
+                    case late {
+                        leaf pretzel {
+                            type empty;
+                        }
+                    }
+                }
+            }
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/EnumBoundaryValue.yang b/utils/yangutils/plugin/src/test/resources/EnumBoundaryValue.yang
new file mode 100644
index 0000000..ac87ef0
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/EnumBoundaryValue.yang
@@ -0,0 +1,16 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf ifType {
+        type enumeration {
+             enum "unbounded";
+             enum ZERO;
+             enum two;
+             enum four;
+             enum seven {
+                 value 21474836472147483647;
+             }
+         }
+     }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/EnumMaxNextValue.yang b/utils/yangutils/plugin/src/test/resources/EnumMaxNextValue.yang
new file mode 100644
index 0000000..4e4a373
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/EnumMaxNextValue.yang
@@ -0,0 +1,18 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf ifType {
+        type enumeration {
+             enum "unbounded";
+             enum ZERO;
+             enum two;
+             enum four;
+             enum seven {
+                 value 2147483647;
+             }
+             enum five;    
+            
+         }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/EnumSorted.yang b/utils/yangutils/plugin/src/test/resources/EnumSorted.yang
new file mode 100644
index 0000000..3760e83
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/EnumSorted.yang
@@ -0,0 +1,18 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf ifType {
+        type enumeration {
+             enum four{
+                 value 7;
+             }
+             enum seven {
+                 value 2147483647;
+             }
+             enum five {
+                 value 5;
+             }       
+         }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/EnumTranslator.yang b/utils/yangutils/plugin/src/test/resources/EnumTranslator.yang
new file mode 100644
index 0000000..1957c1f
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/EnumTranslator.yang
@@ -0,0 +1,17 @@
+module Sfc {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf test{
+        type string;
+    }
+    leaf myenum {
+      type enumeration {
+         enum zero;
+         enum one;
+         enum seven {
+              value 7;
+             }
+         }
+     }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/EnumTypeStatement.yang b/utils/yangutils/plugin/src/test/resources/EnumTypeStatement.yang
new file mode 100644
index 0000000..1d64805
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/EnumTypeStatement.yang
@@ -0,0 +1,12 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf speed {
+        type enumeration {
+          enum 10m;
+          enum 100m;
+          enum auto;
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/EnumWithDuplicateName.yang b/utils/yangutils/plugin/src/test/resources/EnumWithDuplicateName.yang
new file mode 100644
index 0000000..47c3a85
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/EnumWithDuplicateName.yang
@@ -0,0 +1,14 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf speed {
+        type enumeration {
+            enum 10m;
+            enum 100m;
+            enum 10m {
+                value 11;
+            }
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/GroupingAttributes.yang b/utils/yangutils/plugin/src/test/resources/GroupingAttributes.yang
new file mode 100644
index 0000000..f04641f
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/GroupingAttributes.yang
@@ -0,0 +1,25 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    import ietf-yang-types {
+             prefix "P";
+         }
+    list valid {
+        key address;
+        leaf address {
+            type P:ip;
+        }
+        grouping endpoint {
+            description "grouping under test";
+            status current;
+            reference "RFC 6020";
+            leaf address {
+                type P:ip-address;
+            }
+            leaf port {
+                type P:port-number;
+            }
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/GroupingInContainer.yang b/utils/yangutils/plugin/src/test/resources/GroupingInContainer.yang
new file mode 100644
index 0000000..dfa8259
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/GroupingInContainer.yang
@@ -0,0 +1,18 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    import ietf-yang-types {
+             prefix "P";
+         }
+    container valid {
+        grouping endpoint {
+            leaf address {
+                type P:ip-address;
+            }
+            leaf port {
+                type P:port-number;
+            }
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/GroupingInList.yang b/utils/yangutils/plugin/src/test/resources/GroupingInList.yang
new file mode 100644
index 0000000..c5966fc
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/GroupingInList.yang
@@ -0,0 +1,22 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    import ietf-yang-types {
+             prefix "P";
+         }
+    list valid {
+        key address;
+        leaf address {
+            type P:ip;
+        }
+        grouping endpoint {
+            leaf address {
+                type P:ip-address;
+            }
+            leaf port {
+                type P:port-number;
+            }
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/GroupingInModule.yang b/utils/yangutils/plugin/src/test/resources/GroupingInModule.yang
new file mode 100644
index 0000000..77fef1f
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/GroupingInModule.yang
@@ -0,0 +1,16 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    import ietf-yang-types {
+             prefix "P";
+         }
+    grouping endpoint {
+        leaf address {
+            type P:ip-address;
+        }
+        leaf port {
+            type P:port-number;
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/IdentityrefInvalidIdentifier.yang b/utils/yangutils/plugin/src/test/resources/IdentityrefInvalidIdentifier.yang
new file mode 100644
index 0000000..99a8129
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/IdentityrefInvalidIdentifier.yang
@@ -0,0 +1,11 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    grouping currentcheck {
+        leaf invalid-interval {
+            type identityref {
+            }
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/ImportInvalidOrder.yang b/utils/yangutils/plugin/src/test/resources/ImportInvalidOrder.yang
new file mode 100644
index 0000000..6bfc685
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ImportInvalidOrder.yang
@@ -0,0 +1,10 @@
+module Test {
+yang-version 1;
+namespace urn:ietf:params:xml:ns:yang:ietf-ospf;
+prefix On;
+import ietf {
+revision-date 2015-02-03;
+prefix On1;
+}
+contact "Test";
+}
diff --git a/utils/yangutils/plugin/src/test/resources/ImportMultipleInstance.yang b/utils/yangutils/plugin/src/test/resources/ImportMultipleInstance.yang
new file mode 100644
index 0000000..175f2ff
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ImportMultipleInstance.yang
@@ -0,0 +1,14 @@
+module Test {
+yang-version 1;
+namespace urn:ietf:params:xml:ns:yang:ietf-ospf;
+prefix On;
+import ietf {
+prefix On2;
+revision-date 2015-02-03;
+}
+import itut {
+prefix On3;
+revision-date 2016-02-03;
+}
+contact "Test";
+}
diff --git a/utils/yangutils/plugin/src/test/resources/ImportValidEntry.yang b/utils/yangutils/plugin/src/test/resources/ImportValidEntry.yang
new file mode 100644
index 0000000..b725d39
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ImportValidEntry.yang
@@ -0,0 +1,10 @@
+module Test {
+yang-version 1;
+namespace urn:ietf:params:xml:ns:yang:ietf-ospf;
+prefix On;
+import ietf {
+prefix On2;
+revision-date 2015-02-03;
+}
+contact "Test";
+}
diff --git a/utils/yangutils/plugin/src/test/resources/ImportWithDualPrefix.yang b/utils/yangutils/plugin/src/test/resources/ImportWithDualPrefix.yang
new file mode 100644
index 0000000..8b40bb0
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ImportWithDualPrefix.yang
@@ -0,0 +1,11 @@
+module Test {
+yang-version 1;
+namespace urn:ietf:params:xml:ns:yang:ietf-ospf;
+prefix On;
+import ietf {
+prefix On1;
+prefix On2;
+revision-date 2015-02-03;
+}
+contact "Test";
+}
diff --git a/utils/yangutils/plugin/src/test/resources/ImportWithoutPrefix.yang b/utils/yangutils/plugin/src/test/resources/ImportWithoutPrefix.yang
new file mode 100644
index 0000000..ee68e59
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ImportWithoutPrefix.yang
@@ -0,0 +1,9 @@
+module Test {
+yang-version 1;
+namespace urn:ietf:params:xml:ns:yang:ietf-ospf;
+prefix On;
+import ietf {
+revision-date 2015-02-03;
+}
+contact "Test";
+}
diff --git a/utils/yangutils/plugin/src/test/resources/ImportWithoutRevision.yang b/utils/yangutils/plugin/src/test/resources/ImportWithoutRevision.yang
new file mode 100644
index 0000000..af47b7a
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ImportWithoutRevision.yang
@@ -0,0 +1,9 @@
+module Test {
+yang-version 1;
+namespace urn:ietf:params:xml:ns:yang:ietf-ospf;
+prefix On;
+import ietf {
+prefix On2;
+}
+contact "Test";
+}
diff --git a/utils/yangutils/plugin/src/test/resources/InValidIdentifierXML.yang b/utils/yangutils/plugin/src/test/resources/InValidIdentifierXML.yang
new file mode 100644
index 0000000..c6a5a42
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/InValidIdentifierXML.yang
@@ -0,0 +1,5 @@
+module xMlTest {
+yang-version 1;
+namespace urn:ietf:params:xml:ns:yang:ietf-ospf;
+prefix On;
+}
diff --git a/utils/yangutils/plugin/src/test/resources/IncludeImportAnyOrder.yang b/utils/yangutils/plugin/src/test/resources/IncludeImportAnyOrder.yang
new file mode 100644
index 0000000..05339a6
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/IncludeImportAnyOrder.yang
@@ -0,0 +1,16 @@
+module Test {
+yang-version 1;
+namespace urn:ietf:params:xml:ns:yang:ietf-ospf;
+prefix On;
+include itut {
+revision-date 2016-02-03;
+}
+import ietf {
+prefix On2;
+revision-date 2015-02-03;
+}
+include sdn {
+revision-date 2014-02-03;
+}
+contact "Test";
+}
diff --git a/utils/yangutils/plugin/src/test/resources/IncludeInvalidDateSyntax.yang b/utils/yangutils/plugin/src/test/resources/IncludeInvalidDateSyntax.yang
new file mode 100644
index 0000000..3716209
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/IncludeInvalidDateSyntax.yang
@@ -0,0 +1,16 @@
+module Test {
+yang-version 1;
+namespace urn:ietf:params:xml:ns:yang:ietf-ospf;
+prefix On;
+import ietf {
+prefix On2;
+revision-date 2015-02-03;
+}
+include itut {
+revision-date 16-02-03;
+}
+include sdn {
+revision-date 2014-02-03;
+}
+contact "Test";
+}
diff --git a/utils/yangutils/plugin/src/test/resources/IncludeInvalidSyntax.yang b/utils/yangutils/plugin/src/test/resources/IncludeInvalidSyntax.yang
new file mode 100644
index 0000000..91ae17b
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/IncludeInvalidSyntax.yang
@@ -0,0 +1,16 @@
+module Test {
+yang-version 1;
+namespace urn:ietf:params:xml:ns:yang:ietf-ospf;
+prefix On;
+import ietf {
+prefix On2;
+revision-date 2015-02-03;
+}
+include itut; {
+revision-date 2016-02-03;
+}
+include sdn {
+revision-date 2014-02-03;
+}
+contact "Test";
+}
diff --git a/utils/yangutils/plugin/src/test/resources/IncludeMultiInstance.yang b/utils/yangutils/plugin/src/test/resources/IncludeMultiInstance.yang
new file mode 100644
index 0000000..81a527a
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/IncludeMultiInstance.yang
@@ -0,0 +1,16 @@
+module Test {
+yang-version 1;
+namespace urn:ietf:params:xml:ns:yang:ietf-ospf;
+prefix On;
+import ietf {
+prefix On2;
+revision-date 2015-02-03;
+}
+include itut {
+revision-date 2016-02-03;
+}
+include sdn {
+revision-date 2014-02-03;
+}
+contact "Test";
+}
diff --git a/utils/yangutils/plugin/src/test/resources/IncludeWithDate.yang b/utils/yangutils/plugin/src/test/resources/IncludeWithDate.yang
new file mode 100644
index 0000000..9701a2d
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/IncludeWithDate.yang
@@ -0,0 +1,13 @@
+module Test {
+yang-version 1;
+namespace urn:ietf:params:xml:ns:yang:ietf-ospf;
+prefix On;
+import ietf {
+prefix On2;
+revision-date 2015-02-03;
+}
+include itut {
+revision-date 2016-02-03;
+}
+contact "Test";
+}
diff --git a/utils/yangutils/plugin/src/test/resources/IncludeWithEmptyBody.yang b/utils/yangutils/plugin/src/test/resources/IncludeWithEmptyBody.yang
new file mode 100644
index 0000000..471fdb3
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/IncludeWithEmptyBody.yang
@@ -0,0 +1,12 @@
+module Test {
+yang-version 1;
+namespace urn:ietf:params:xml:ns:yang:ietf-ospf;
+prefix On;
+import ietf {
+prefix On2;
+revision-date 2015-02-03;
+}
+include itut {
+}
+contact "Test";
+}
diff --git a/utils/yangutils/plugin/src/test/resources/IncludeWithStmtend.yang b/utils/yangutils/plugin/src/test/resources/IncludeWithStmtend.yang
new file mode 100644
index 0000000..e40813b
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/IncludeWithStmtend.yang
@@ -0,0 +1,11 @@
+module Test {
+yang-version 1;
+namespace urn:ietf:params:xml:ns:yang:ietf-ospf;
+prefix On;
+import ietf {
+prefix On2;
+revision-date 2015-02-03;
+}
+include itut;
+contact "Test";
+}
diff --git a/utils/yangutils/plugin/src/test/resources/InputStatementWithDataDefinition.yang b/utils/yangutils/plugin/src/test/resources/InputStatementWithDataDefinition.yang
new file mode 100644
index 0000000..0adf3d3
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/InputStatementWithDataDefinition.yang
@@ -0,0 +1,28 @@
+module rock {
+    namespace "http://example.net/rock";
+    prefix "rock";
+
+    rpc activate-software-image {
+        description "description";
+        input {
+            leaf image-name {
+                type string;
+            }
+            list ospf {
+                key "invalid-interval";
+                config true;
+                max-elements 10;
+                min-elements 3;
+                leaf invalid-interval {
+                    type uint16;
+                }
+            }
+            container isis {
+               config true;
+               leaf invalid-interval {
+                   type uint16;
+               }
+           }
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/InputStatementWithTypedef.yang b/utils/yangutils/plugin/src/test/resources/InputStatementWithTypedef.yang
new file mode 100644
index 0000000..25ca73d
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/InputStatementWithTypedef.yang
@@ -0,0 +1,17 @@
+module rock {
+    namespace "http://example.net/rock";
+    prefix "rock";
+
+    rpc activate-software-image {
+        description "description";
+        input {
+            leaf image-name {
+                type string;
+            }
+            typedef my-type {
+                status deprecated;
+                type int32;
+            }
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/InstanceIdentifierInvalidIdentifier.yang b/utils/yangutils/plugin/src/test/resources/InstanceIdentifierInvalidIdentifier.yang
new file mode 100644
index 0000000..0bbe2f1
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/InstanceIdentifierInvalidIdentifier.yang
@@ -0,0 +1,10 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    container currentcheck {
+        leaf invalid-interval {
+            type instance-identifier;
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/IntegerTypeStatement.yang b/utils/yangutils/plugin/src/test/resources/IntegerTypeStatement.yang
new file mode 100644
index 0000000..ca2be38
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/IntegerTypeStatement.yang
@@ -0,0 +1,8 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf invalid-interval {
+        type "uint16";
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/InvalidLeafIdentifier.yang b/utils/yangutils/plugin/src/test/resources/InvalidLeafIdentifier.yang
new file mode 100644
index 0000000..6faf092
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/InvalidLeafIdentifier.yang
@@ -0,0 +1,14 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    list valid {
+        key "invalid-interval";
+        leaf invalid {
+            type "string";
+            units "seconds";
+            status current;
+            reference "RFC 6020";
+        }
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/InvalidLeafListIdentifier.yang b/utils/yangutils/plugin/src/test/resources/InvalidLeafListIdentifier.yang
new file mode 100644
index 0000000..6359d2a
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/InvalidLeafListIdentifier.yang
@@ -0,0 +1,14 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    list valid {
+        key "invalid-interval";
+        leaf-list invalid {
+            type "string";
+            units "seconds";
+            status current;
+            reference "RFC 6020";
+        }
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/InvalidPatternSubStatements.yang b/utils/yangutils/plugin/src/test/resources/InvalidPatternSubStatements.yang
new file mode 100644
index 0000000..76ff75e
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/InvalidPatternSubStatements.yang
@@ -0,0 +1,13 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf invalid-interval {
+        type string {
+            pattern "[a-zA-Z]\" {
+                description "pattern description";
+                reference "pattern reference";
+            }
+         }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/KeyLeafListTypeEmpty.yang b/utils/yangutils/plugin/src/test/resources/KeyLeafListTypeEmpty.yang
new file mode 100644
index 0000000..44c1617
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/KeyLeafListTypeEmpty.yang
@@ -0,0 +1,14 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    list valid {
+        key "invalid-interval";
+        leaf-list invalid-interval {
+            type "empty";
+            units "seconds";
+            status current;
+            reference "RFC 6020";
+        }
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/KeyLeafTypeEmpty.yang b/utils/yangutils/plugin/src/test/resources/KeyLeafTypeEmpty.yang
new file mode 100644
index 0000000..859520c
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/KeyLeafTypeEmpty.yang
@@ -0,0 +1,14 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    list valid {
+        key "invalid-interval";
+        leaf invalid-interval {
+            type "empty";
+            units "seconds";
+            status current;
+            reference "RFC 6020";
+        }
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/KeyWithUsesInList.yang b/utils/yangutils/plugin/src/test/resources/KeyWithUsesInList.yang
new file mode 100644
index 0000000..d076d0a
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/KeyWithUsesInList.yang
@@ -0,0 +1,23 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    grouping network {
+        leaf invalid-interval {
+            type "string";
+            units "seconds";
+            status current;
+            reference "RFC 6020";
+        }
+    }
+    list valid {
+        key "invalid-interval";
+        leaf invalid {
+            type "string";
+            units "seconds";
+            status current;
+            reference "RFC 6020";
+        }
+        uses "network";
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/KeyWithoutStatementEnd.yang b/utils/yangutils/plugin/src/test/resources/KeyWithoutStatementEnd.yang
new file mode 100644
index 0000000..f56101a
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/KeyWithoutStatementEnd.yang
@@ -0,0 +1,14 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    list valid {
+        key "invalid"
+        leaf invalid-interval {
+            type "uint16";
+            units "seconds";
+            status current;
+            reference "RFC 6020";
+        }
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/LeafConfigInvalidCardinality.yang b/utils/yangutils/plugin/src/test/resources/LeafConfigInvalidCardinality.yang
new file mode 100644
index 0000000..d403a56
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/LeafConfigInvalidCardinality.yang
@@ -0,0 +1,15 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf invalid-interval {
+       type "uint16";
+       units "seconds";
+       description "Interval before a route is declared invalid";
+       config true;
+       config false;
+       mandatory true;
+       status current;
+       reference "RFC 6020";
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/LeafInvalidIdentifier.yang b/utils/yangutils/plugin/src/test/resources/LeafInvalidIdentifier.yang
new file mode 100644
index 0000000..dbfff13
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/LeafInvalidIdentifier.yang
@@ -0,0 +1,14 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf 1invalid-interval {
+        type "uint16";
+        units "seconds";
+        description "Interval before a route is declared invalid";
+        config true;
+        mandatory true;
+        status current;
+        reference "RFC 6020";
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/LeafInvalidStatement.yang b/utils/yangutils/plugin/src/test/resources/LeafInvalidStatement.yang
new file mode 100644
index 0000000..4d4f6f6
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/LeafInvalidStatement.yang
@@ -0,0 +1,14 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leafs invalid-interval {
+        type "uint16";
+        units "seconds";
+        description "Interval before a route is declared invalid";
+        config true;
+        mandatory true;
+        status current;
+        reference "RFC 6020";
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/LeafListConfigInvalidCardinality.yang b/utils/yangutils/plugin/src/test/resources/LeafListConfigInvalidCardinality.yang
new file mode 100644
index 0000000..361a852
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/LeafListConfigInvalidCardinality.yang
@@ -0,0 +1,14 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf-list invalid-interval {
+        type "uint16";
+        units "seconds";
+        description "Interval before a route is declared invalid";
+        config true;
+        config false;
+        status current;
+        reference "RFC 6020";
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/LeafListInvalidIdentifier.yang b/utils/yangutils/plugin/src/test/resources/LeafListInvalidIdentifier.yang
new file mode 100644
index 0000000..77c24d2
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/LeafListInvalidIdentifier.yang
@@ -0,0 +1,13 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf-list 1invalid-interval {
+        type "uint16";
+        units "seconds";
+        description "Interval before a route is declared invalid";
+        config true;
+        status current;
+        reference "RFC 6020";
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/LeafListInvalidStatement.yang b/utils/yangutils/plugin/src/test/resources/LeafListInvalidStatement.yang
new file mode 100644
index 0000000..13e4b5f
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/LeafListInvalidStatement.yang
@@ -0,0 +1,13 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaflist invalid-interval {
+        type "uint16";
+        units "seconds";
+        description "Interval before a route is declared invalid";
+        config true;
+        status current;
+        reference "RFC 6020";
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/LeafListSubStatementConfig.yang b/utils/yangutils/plugin/src/test/resources/LeafListSubStatementConfig.yang
new file mode 100644
index 0000000..293e4a5
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/LeafListSubStatementConfig.yang
@@ -0,0 +1,13 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf-list invalid-interval {
+        type "uint16";
+        units "seconds";
+        description "Interval before a route is declared invalid";
+        config true;
+        status current;
+        reference "RFC 6020";
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/LeafListSubStatementDescription.yang b/utils/yangutils/plugin/src/test/resources/LeafListSubStatementDescription.yang
new file mode 100644
index 0000000..293e4a5
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/LeafListSubStatementDescription.yang
@@ -0,0 +1,13 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf-list invalid-interval {
+        type "uint16";
+        units "seconds";
+        description "Interval before a route is declared invalid";
+        config true;
+        status current;
+        reference "RFC 6020";
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/LeafListSubStatementMaxElements.yang b/utils/yangutils/plugin/src/test/resources/LeafListSubStatementMaxElements.yang
new file mode 100644
index 0000000..5ab2d0f
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/LeafListSubStatementMaxElements.yang
@@ -0,0 +1,9 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf-list invalid-interval {
+        type "uint16";
+        max-elements 3;
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/LeafListSubStatementMinElements.yang b/utils/yangutils/plugin/src/test/resources/LeafListSubStatementMinElements.yang
new file mode 100644
index 0000000..fd71281
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/LeafListSubStatementMinElements.yang
@@ -0,0 +1,9 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf-list invalid-interval {
+        type "uint16";
+        min-elements 3;
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/LeafListSubStatementReference.yang b/utils/yangutils/plugin/src/test/resources/LeafListSubStatementReference.yang
new file mode 100644
index 0000000..293e4a5
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/LeafListSubStatementReference.yang
@@ -0,0 +1,13 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf-list invalid-interval {
+        type "uint16";
+        units "seconds";
+        description "Interval before a route is declared invalid";
+        config true;
+        status current;
+        reference "RFC 6020";
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/LeafListSubStatementStatus.yang b/utils/yangutils/plugin/src/test/resources/LeafListSubStatementStatus.yang
new file mode 100644
index 0000000..293e4a5
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/LeafListSubStatementStatus.yang
@@ -0,0 +1,13 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf-list invalid-interval {
+        type "uint16";
+        units "seconds";
+        description "Interval before a route is declared invalid";
+        config true;
+        status current;
+        reference "RFC 6020";
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/LeafListSubStatementType.yang b/utils/yangutils/plugin/src/test/resources/LeafListSubStatementType.yang
new file mode 100644
index 0000000..0e5ab56
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/LeafListSubStatementType.yang
@@ -0,0 +1,8 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf-list invalid-interval {
+        type "uint16";
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/LeafListSubStatementUnits.yang b/utils/yangutils/plugin/src/test/resources/LeafListSubStatementUnits.yang
new file mode 100644
index 0000000..293e4a5
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/LeafListSubStatementUnits.yang
@@ -0,0 +1,13 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf-list invalid-interval {
+        type "uint16";
+        units "seconds";
+        description "Interval before a route is declared invalid";
+        config true;
+        status current;
+        reference "RFC 6020";
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/LeafListSubStatements.yang b/utils/yangutils/plugin/src/test/resources/LeafListSubStatements.yang
new file mode 100644
index 0000000..29dfdb2
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/LeafListSubStatements.yang
@@ -0,0 +1,14 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf-list invalid-interval {
+        type "uint16";
+        units "seconds";
+        max-elements 3;
+        description "Interval before a route is declared invalid";
+        config true;
+        status current;
+        reference "RFC 6020";
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/LeafListUnitsInvalidCardinality.yang b/utils/yangutils/plugin/src/test/resources/LeafListUnitsInvalidCardinality.yang
new file mode 100644
index 0000000..996e49e
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/LeafListUnitsInvalidCardinality.yang
@@ -0,0 +1,14 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf-list invalid-interval {
+        type "uint16";
+        units "seconds";
+        units "minutes";
+        description "Interval before a route is declared invalid";
+        config true;
+        status current;
+        reference "RFC 6020";
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/LeafListWithoutLeftBrace.yang b/utils/yangutils/plugin/src/test/resources/LeafListWithoutLeftBrace.yang
new file mode 100644
index 0000000..1196422
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/LeafListWithoutLeftBrace.yang
@@ -0,0 +1,13 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf-list invalid-interval 
+        type "uint16";
+        units "seconds";
+        description "Interval before a route is declared invalid";
+        config true;
+        status current;
+        reference "RFC 6020";
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/LeafMandatoryInvalidCardinality.yang b/utils/yangutils/plugin/src/test/resources/LeafMandatoryInvalidCardinality.yang
new file mode 100644
index 0000000..c275dd7
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/LeafMandatoryInvalidCardinality.yang
@@ -0,0 +1,15 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf invalid-interval {
+        type "uint16";
+        units "seconds";
+        description "Interval before a route is declared invalid";
+        config true;
+        mandatory true;
+        mandatory false;
+        status current;
+        reference "RFC 6020";
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/LeafSubStatementDefault.yang b/utils/yangutils/plugin/src/test/resources/LeafSubStatementDefault.yang
new file mode 100644
index 0000000..a78131d
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/LeafSubStatementDefault.yang
@@ -0,0 +1,15 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf invalid-interval {
+        type "uint16";
+        units "seconds";
+        default "1";
+        description "Interval before a route is declared invalid";
+        config true;
+        mandatory true;
+        status current;
+        reference "RFC 6020";
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/LeafSubStatements.yang b/utils/yangutils/plugin/src/test/resources/LeafSubStatements.yang
new file mode 100644
index 0000000..70349a0
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/LeafSubStatements.yang
@@ -0,0 +1,14 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf invalid-interval {
+        type "uint16";
+        units "seconds";
+        description "Interval before a route is declared invalid";
+        config true;
+        mandatory true;
+        status current;
+        reference "RFC 6020";
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/LeafWithoutLeftBrace.yang b/utils/yangutils/plugin/src/test/resources/LeafWithoutLeftBrace.yang
new file mode 100644
index 0000000..c2aa979
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/LeafWithoutLeftBrace.yang
@@ -0,0 +1,14 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf invalid-interval 
+    type "uint16";
+    units "seconds";
+    description "Interval before a route is declared invalid";
+    config true;
+    mandatory true;
+    status current;
+    reference "RFC 6020";
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/LeafrefInvalidIdentifier.yang b/utils/yangutils/plugin/src/test/resources/LeafrefInvalidIdentifier.yang
new file mode 100644
index 0000000..4737b6c
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/LeafrefInvalidIdentifier.yang
@@ -0,0 +1,8 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf-list invalid-interval {
+        type leafref;
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/LengthRestrictionInRefType.yang b/utils/yangutils/plugin/src/test/resources/LengthRestrictionInRefType.yang
new file mode 100644
index 0000000..54684f4
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/LengthRestrictionInRefType.yang
@@ -0,0 +1,13 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf invalid-interval {
+        type hello {
+            length "0..100";
+        }
+    }
+    typedef hello {
+        type string;
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/LengthRestrictionInTypedef.yang b/utils/yangutils/plugin/src/test/resources/LengthRestrictionInTypedef.yang
new file mode 100644
index 0000000..17baeec
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/LengthRestrictionInTypedef.yang
@@ -0,0 +1,13 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf invalid-interval {
+        type hello;
+    }
+    typedef hello {
+        type string {
+            length "0..100";
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/LengthRestrictionInTypedefAndTypeInValid.yang b/utils/yangutils/plugin/src/test/resources/LengthRestrictionInTypedefAndTypeInValid.yang
new file mode 100644
index 0000000..65ed7de
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/LengthRestrictionInTypedefAndTypeInValid.yang
@@ -0,0 +1,15 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf invalid-interval {
+        type hello {
+            length "min..20 | 200..max";
+        }
+    }
+    typedef hello {
+        type string {
+            length "0..100 | 101..200 | 201..300";
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/LengthRestrictionInTypedefAndTypeValid.yang b/utils/yangutils/plugin/src/test/resources/LengthRestrictionInTypedefAndTypeValid.yang
new file mode 100644
index 0000000..eca2691
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/LengthRestrictionInTypedefAndTypeValid.yang
@@ -0,0 +1,15 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf invalid-interval {
+        type hello {
+            length "min..20 | 201..max";
+        }
+    }
+    typedef hello {
+        type string {
+            length "0..100 | 101..200 | 201..300";
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/LengthStatementInsideLeafList.yang b/utils/yangutils/plugin/src/test/resources/LengthStatementInsideLeafList.yang
new file mode 100644
index 0000000..06d08db
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/LengthStatementInsideLeafList.yang
@@ -0,0 +1,10 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf-list invalid-interval {
+        type string {
+            length "1..100";
+         }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/LengthStatementInsideTypeDef.yang b/utils/yangutils/plugin/src/test/resources/LengthStatementInsideTypeDef.yang
new file mode 100644
index 0000000..c1195dc
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/LengthStatementInsideTypeDef.yang
@@ -0,0 +1,15 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    typedef invalid-interval {
+        type string {
+            length "1..100";
+         }
+    }
+    leaf xyz {
+       type invalid-interval {
+           length "2..100";
+       }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/LengthStatementWithSpace.yang b/utils/yangutils/plugin/src/test/resources/LengthStatementWithSpace.yang
new file mode 100644
index 0000000..e8612d1
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/LengthStatementWithSpace.yang
@@ -0,0 +1,10 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf invalid-interval {
+        type string {
+            length "                                               0                                                                                      ..                                                                                                                                                                      100                                                                                         ";
+         }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/LengthSubStatements.yang b/utils/yangutils/plugin/src/test/resources/LengthSubStatements.yang
new file mode 100644
index 0000000..f61f979
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/LengthSubStatements.yang
@@ -0,0 +1,13 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf invalid-interval {
+        type string {
+            length "0..100" {
+                description "length description";
+                reference "length reference";
+            }
+         }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/LengthWithInvalidIntegerPattern.yang b/utils/yangutils/plugin/src/test/resources/LengthWithInvalidIntegerPattern.yang
new file mode 100644
index 0000000..f5c8a69
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/LengthWithInvalidIntegerPattern.yang
@@ -0,0 +1,10 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf-list invalid-interval {
+        type string {
+            length "a..z";
+         }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/LengthWithInvalidInterval.yang b/utils/yangutils/plugin/src/test/resources/LengthWithInvalidInterval.yang
new file mode 100644
index 0000000..7b4ae18
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/LengthWithInvalidInterval.yang
@@ -0,0 +1,10 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf-list invalid-interval {
+        type string {
+            length "0..18446744073709551617";
+         }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/LengthWithInvalidType.yang b/utils/yangutils/plugin/src/test/resources/LengthWithInvalidType.yang
new file mode 100644
index 0000000..74b183c
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/LengthWithInvalidType.yang
@@ -0,0 +1,10 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf-list invalid-interval {
+        type int8 {
+            length "1..100";
+         }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/LengthWithMinMax.yang b/utils/yangutils/plugin/src/test/resources/LengthWithMinMax.yang
new file mode 100644
index 0000000..5884266
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/LengthWithMinMax.yang
@@ -0,0 +1,10 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf-list invalid-interval {
+        type string {
+            length "min..max";
+         }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/LengthWithOneInterval.yang b/utils/yangutils/plugin/src/test/resources/LengthWithOneInterval.yang
new file mode 100644
index 0000000..b160f02
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/LengthWithOneInterval.yang
@@ -0,0 +1,10 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf-list invalid-interval {
+        type string {
+            length "1";
+         }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/ListAsRootNode.yang b/utils/yangutils/plugin/src/test/resources/ListAsRootNode.yang
new file mode 100644
index 0000000..289525f
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ListAsRootNode.yang
@@ -0,0 +1,9 @@
+list valid {
+    reference "RFC 6020";
+    leaf invalid-interval {
+        type "uint16";
+        units "seconds";
+        status current;
+        reference "RFC 6020";
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/ListDuplicateContainer.yang b/utils/yangutils/plugin/src/test/resources/ListDuplicateContainer.yang
new file mode 100644
index 0000000..8c152b2
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ListDuplicateContainer.yang
@@ -0,0 +1,27 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    list ospf {
+        key "process-id";
+        container interface {
+            leaf invalid-interval {
+                type "uint16";
+                units "seconds";
+                status current;
+                reference "RFC 6020";
+            }
+        }
+        leaf process-id {
+            type "string";
+        }
+        container interface {
+            leaf invalid-interval {
+                type "uint16";
+                units "seconds";
+                status current;
+                reference "RFC 6020";
+            }
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/ListInvalidIdentifier.yang b/utils/yangutils/plugin/src/test/resources/ListInvalidIdentifier.yang
new file mode 100644
index 0000000..c5f6a3a
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ListInvalidIdentifier.yang
@@ -0,0 +1,15 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    list 1valid {
+        key "invalid-interval";
+        reference "RFC 6020";
+        leaf invalid-interval {
+            type "uint16";
+            units "seconds";
+            status current;
+            reference "RFC 6020";
+        }
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/ListStatementWithoutChild.yang b/utils/yangutils/plugin/src/test/resources/ListStatementWithoutChild.yang
new file mode 100644
index 0000000..5c006d7
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ListStatementWithoutChild.yang
@@ -0,0 +1,8 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    list valid {
+        reference "RFC 6020";
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/ListSubStatementConfig.yang b/utils/yangutils/plugin/src/test/resources/ListSubStatementConfig.yang
new file mode 100644
index 0000000..55432fb
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ListSubStatementConfig.yang
@@ -0,0 +1,17 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    list valid {
+        key "invalid-interval";
+        config true;
+        leaf invalid-interval {
+            type "uint16";
+            units "seconds";
+            description "Interval before a route is declared invalid";
+            mandatory true;
+            status current;
+            reference "RFC 6020";
+        }
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/ListSubStatementContainer.yang b/utils/yangutils/plugin/src/test/resources/ListSubStatementContainer.yang
new file mode 100644
index 0000000..4ce6da4
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ListSubStatementContainer.yang
@@ -0,0 +1,19 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    list ospf {
+        key "process-id";
+        container interface {
+            leaf invalid-interval {
+                type "uint16";
+                units "seconds";
+                status current;
+                reference "RFC 6020";
+            }
+        }
+        leaf process-id {
+            type "string";
+        }
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/ListSubStatementDescription.yang b/utils/yangutils/plugin/src/test/resources/ListSubStatementDescription.yang
new file mode 100644
index 0000000..a8df3d7
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ListSubStatementDescription.yang
@@ -0,0 +1,18 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    list valid {
+    key "invalid-interval";
+    description "list description";
+    config true;
+    leaf invalid-interval {
+        type "uint16";
+        units "seconds";
+        description "Interval before a route is declared invalid";
+        mandatory true;
+        status current;
+        reference "RFC 6020";
+        }
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/ListSubStatementKey.yang b/utils/yangutils/plugin/src/test/resources/ListSubStatementKey.yang
new file mode 100644
index 0000000..791013d
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ListSubStatementKey.yang
@@ -0,0 +1,14 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    list valid {
+        key "invalid-interval";
+        leaf invalid-interval {
+            type "uint16";
+            units "seconds";
+            status current;
+            reference "RFC 6020";
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/ListSubStatementLeaf.yang b/utils/yangutils/plugin/src/test/resources/ListSubStatementLeaf.yang
new file mode 100644
index 0000000..59b92cc
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ListSubStatementLeaf.yang
@@ -0,0 +1,17 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    list valid {
+        key "invalid-interval";
+        leaf invalid-interval {
+            type "uint16";
+            units "seconds";
+            description "Interval before a route is declared invalid";
+            config true;
+            mandatory true;
+            status current;
+            reference "RFC 6020";
+        }
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/ListSubStatementLeafList.yang b/utils/yangutils/plugin/src/test/resources/ListSubStatementLeafList.yang
new file mode 100644
index 0000000..5235295
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ListSubStatementLeafList.yang
@@ -0,0 +1,17 @@
+
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    list valid {
+        key "invalid-interval";
+        leaf-list invalid-interval {
+            type "uint16";
+            units "seconds";
+            description "Interval before a route is declared invalid";
+            config true;
+            status current;
+            reference "RFC 6020";
+        }
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/ListSubStatementList.yang b/utils/yangutils/plugin/src/test/resources/ListSubStatementList.yang
new file mode 100644
index 0000000..2021469
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ListSubStatementList.yang
@@ -0,0 +1,20 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    list ospf {
+        key "process-id";
+        list valid {
+            key "invalid-interval";
+            leaf invalid-interval {
+                type "uint16";
+                units "seconds";
+                status current;
+                reference "RFC 6020";
+            }
+        }
+        leaf process-id {
+            type "string";
+        }
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/ListSubStatementMaxElements.yang b/utils/yangutils/plugin/src/test/resources/ListSubStatementMaxElements.yang
new file mode 100644
index 0000000..de6139e
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ListSubStatementMaxElements.yang
@@ -0,0 +1,14 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    list valid {
+        key "invalid-interval";
+        max-elements 3;
+        leaf-list invalid-interval {
+            type "uint16";
+            units "seconds";
+            description "Interval before a route is declared invalid";
+        }
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/ListSubStatementMinElements.yang b/utils/yangutils/plugin/src/test/resources/ListSubStatementMinElements.yang
new file mode 100644
index 0000000..d6071e8
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ListSubStatementMinElements.yang
@@ -0,0 +1,14 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    list valid {
+        key "invalid-interval";
+        min-elements 3;
+        leaf-list invalid-interval {
+            type "uint16";
+            units "seconds";
+            description "Interval before a route is declared invalid";
+        }
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/ListSubStatementReference.yang b/utils/yangutils/plugin/src/test/resources/ListSubStatementReference.yang
new file mode 100644
index 0000000..8adfa04
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ListSubStatementReference.yang
@@ -0,0 +1,18 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    list valid {
+        key "invalid-interval";
+        reference "list reference";
+        config true;
+        leaf invalid-interval {
+            type "uint16";
+            units "seconds";
+            description "Interval before a route is declared invalid";
+            mandatory true;
+            status current;
+            reference "RFC 6020";
+        }
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/ListSubStatementStatus.yang b/utils/yangutils/plugin/src/test/resources/ListSubStatementStatus.yang
new file mode 100644
index 0000000..b88ac74
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ListSubStatementStatus.yang
@@ -0,0 +1,18 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    list valid {
+        key "invalid-interval";
+        status current;
+        config true;
+        leaf invalid-interval {
+            type "uint16";
+            units "seconds";
+            description "Interval before a route is declared invalid";
+            mandatory true;
+            status current;
+            reference "RFC 6020";
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/ListSubStatements.yang b/utils/yangutils/plugin/src/test/resources/ListSubStatements.yang
new file mode 100644
index 0000000..109fc17
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ListSubStatements.yang
@@ -0,0 +1,20 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    list ospf {
+        key "invalid-interval";
+        config true;
+        max-elements 10;
+        min-elements 3;
+        description "list description";
+        status current;
+        reference "list reference";
+        leaf invalid-interval {
+            type "uint16";
+            units "seconds";
+            status current;
+            reference "RFC 6020";
+        }
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/ListSubStatementsCardinality.yang b/utils/yangutils/plugin/src/test/resources/ListSubStatementsCardinality.yang
new file mode 100644
index 0000000..9c4077c
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ListSubStatementsCardinality.yang
@@ -0,0 +1,16 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    list valid {
+        key "invalid-interval";
+        reference "RFC 6020";
+        reference "RFC 6020";
+        leaf invalid-interval {
+            type "uint16";
+            units "seconds";
+            status current;
+            reference "RFC 6020";
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/ListWithDuplicateLeaf.yang b/utils/yangutils/plugin/src/test/resources/ListWithDuplicateLeaf.yang
new file mode 100644
index 0000000..55a78f6
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ListWithDuplicateLeaf.yang
@@ -0,0 +1,26 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    list valid {
+        key "invalid-interval";
+        leaf invalid-interval {
+            type "uint16";
+            units "seconds";
+            description "Interval before a route is declared invalid";
+            config true;
+            mandatory true;
+            status current;
+            reference "RFC 6020";
+        }
+        leaf invalid-interval {
+            type "uint16";
+            units "seconds";
+            description "Interval before a route is declared invalid";
+            config true;
+            mandatory true;
+            status current;
+            reference "RFC 6020";
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/MandatoryDefaultValue.yang b/utils/yangutils/plugin/src/test/resources/MandatoryDefaultValue.yang
new file mode 100644
index 0000000..c71d5ea
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/MandatoryDefaultValue.yang
@@ -0,0 +1,8 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf invalid-interval {
+        type "uint16";
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/MandatoryEmptyStatement.yang b/utils/yangutils/plugin/src/test/resources/MandatoryEmptyStatement.yang
new file mode 100644
index 0000000..e2af869
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/MandatoryEmptyStatement.yang
@@ -0,0 +1,9 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf invalid-interval {
+        type "uint16";
+        mandatory ;
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/MandatoryFalse.yang b/utils/yangutils/plugin/src/test/resources/MandatoryFalse.yang
new file mode 100644
index 0000000..3ae4601
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/MandatoryFalse.yang
@@ -0,0 +1,9 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf invalid-interval {
+        type "uint16";
+        mandatory false;
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/MandatoryTrue.yang b/utils/yangutils/plugin/src/test/resources/MandatoryTrue.yang
new file mode 100644
index 0000000..70349a0
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/MandatoryTrue.yang
@@ -0,0 +1,14 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf invalid-interval {
+        type "uint16";
+        units "seconds";
+        description "Interval before a route is declared invalid";
+        config true;
+        mandatory true;
+        status current;
+        reference "RFC 6020";
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/MandatoryWithoutStatementEnd.yang b/utils/yangutils/plugin/src/test/resources/MandatoryWithoutStatementEnd.yang
new file mode 100644
index 0000000..055f556
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/MandatoryWithoutStatementEnd.yang
@@ -0,0 +1,9 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf invalid-interval {
+    type "uint16";
+    mandatory false
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/MaxElementsCardinality.yang b/utils/yangutils/plugin/src/test/resources/MaxElementsCardinality.yang
new file mode 100644
index 0000000..bff2fd7
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/MaxElementsCardinality.yang
@@ -0,0 +1,15 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf-list invalid-interval {
+        type "uint16";
+        units "seconds";
+        max-elements 4;
+        max-elements 6;
+        description "Interval before a route is declared invalid";
+        config true;
+        status current;
+        reference "RFC 6020";
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/MaxElementsDefaultValue.yang b/utils/yangutils/plugin/src/test/resources/MaxElementsDefaultValue.yang
new file mode 100644
index 0000000..a591146
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/MaxElementsDefaultValue.yang
@@ -0,0 +1,8 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf-list invalid-interval {
+       type "uint16";
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/MaxElementsInvalidStatement.yang b/utils/yangutils/plugin/src/test/resources/MaxElementsInvalidStatement.yang
new file mode 100644
index 0000000..67cb358
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/MaxElementsInvalidStatement.yang
@@ -0,0 +1,14 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf-list invalid-interval {
+        type "uint16";
+        units "seconds";
+        max-element 3;
+        description "Interval before a route is declared invalid;
+        config true;
+        status current;
+        reference "RFC 6020";
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/MaxElementsMaxValue.yang b/utils/yangutils/plugin/src/test/resources/MaxElementsMaxValue.yang
new file mode 100644
index 0000000..7bdfbb0
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/MaxElementsMaxValue.yang
@@ -0,0 +1,9 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf-list invalid-interval {
+        type "uint16";
+        max-elements 77777777777777777777777;
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/MaxElementsUnbounded.yang b/utils/yangutils/plugin/src/test/resources/MaxElementsUnbounded.yang
new file mode 100644
index 0000000..afaca4f
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/MaxElementsUnbounded.yang
@@ -0,0 +1,9 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf-list invalid-interval {
+       type "uint16";
+       max-elements unbounded;
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/MaxElementsWithoutStatementEnd.yang b/utils/yangutils/plugin/src/test/resources/MaxElementsWithoutStatementEnd.yang
new file mode 100644
index 0000000..5973dd0
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/MaxElementsWithoutStatementEnd.yang
@@ -0,0 +1,14 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf-list invalid-interval {
+    type "uint16";
+    units "seconds";
+    max-elements 3
+    description "Interval before a route is declared invalid";
+    config true;
+    status current;
+    reference "RFC 6020";
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/MinElementsDefaultValue.yang b/utils/yangutils/plugin/src/test/resources/MinElementsDefaultValue.yang
new file mode 100644
index 0000000..a591146
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/MinElementsDefaultValue.yang
@@ -0,0 +1,8 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf-list invalid-interval {
+       type "uint16";
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/MinElementsInvalidCardinality.yang b/utils/yangutils/plugin/src/test/resources/MinElementsInvalidCardinality.yang
new file mode 100644
index 0000000..18f6019
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/MinElementsInvalidCardinality.yang
@@ -0,0 +1,15 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf-list invalid-interval {
+        type "uint16";
+        units "seconds";
+        min-elements 4;
+        min-elements 6;
+        description "Interval before a route is declared invalid";
+        config true;
+        status current;
+        reference "RFC 6020";
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/MinElementsInvalidKeyword.yang b/utils/yangutils/plugin/src/test/resources/MinElementsInvalidKeyword.yang
new file mode 100644
index 0000000..e634509
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/MinElementsInvalidKeyword.yang
@@ -0,0 +1,14 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf-list invalid-interval {
+        type "uint16";
+        units "seconds";
+        min-element 3;
+        description "Interval before a route is declared invalid";
+        config true;
+        status current;
+        reference "RFC 6020";
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/MinElementsInvalidValue.yang b/utils/yangutils/plugin/src/test/resources/MinElementsInvalidValue.yang
new file mode 100644
index 0000000..a381184
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/MinElementsInvalidValue.yang
@@ -0,0 +1,14 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf-list invalid-interval {
+        type "uint16";
+        units "seconds";
+        min-elements asd;
+        description "Interval before a route is declared invalid";
+        config true;
+        status current;
+        reference "RFC 6020";
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/MinElementsMaxValue.yang b/utils/yangutils/plugin/src/test/resources/MinElementsMaxValue.yang
new file mode 100644
index 0000000..785482b
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/MinElementsMaxValue.yang
@@ -0,0 +1,9 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf-list invalid-interval {
+        type "uint16";
+        min-elements 77777777777777777777777;
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/MinElementsWithoutStatementEnd.yang b/utils/yangutils/plugin/src/test/resources/MinElementsWithoutStatementEnd.yang
new file mode 100644
index 0000000..699a8b8
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/MinElementsWithoutStatementEnd.yang
@@ -0,0 +1,14 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf-list invalid-interval {
+    type "uint16";
+    units "seconds";
+    min-elements 3
+    description "Interval before a route is declared invalid";
+    config true;
+    status current;
+    reference "RFC 6020";
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/ModuleDuplicateContainer.yang b/utils/yangutils/plugin/src/test/resources/ModuleDuplicateContainer.yang
new file mode 100644
index 0000000..bc58896
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ModuleDuplicateContainer.yang
@@ -0,0 +1,29 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    container valid {
+        leaf invalid-interval {
+            type "uint16";
+            units "seconds";
+            status current;
+            reference "RFC 6020";
+        }
+    }
+    container invalid {
+        leaf invalid-interval {
+            type "uint16";
+            units "seconds";
+            status current;
+            reference "RFC 6020";
+        }
+    }
+    container valid {
+        leaf invalid-interval {
+            type "uint16";
+            units "seconds";
+            status current;
+            reference "RFC 6020";
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/ModuleInvalidIdentifierLength.yang b/utils/yangutils/plugin/src/test/resources/ModuleInvalidIdentifierLength.yang
new file mode 100644
index 0000000..fac16bc
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ModuleInvalidIdentifierLength.yang
@@ -0,0 +1,5 @@
+module Testttttttttttttttttttttttttttttttttttttttttttttttttttttttttttttt {
+yang-version 1;
+namespace urn:ietf:params:xml:ns:yang:ietf-ospf;
+prefix On;
+}
diff --git a/utils/yangutils/plugin/src/test/resources/ModuleSubStatementConfig.yang b/utils/yangutils/plugin/src/test/resources/ModuleSubStatementConfig.yang
new file mode 100644
index 0000000..49deb3e
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ModuleSubStatementConfig.yang
@@ -0,0 +1,6 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    config invalid;
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/ModuleSubStatementContainer.yang b/utils/yangutils/plugin/src/test/resources/ModuleSubStatementContainer.yang
new file mode 100644
index 0000000..35a91ad
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ModuleSubStatementContainer.yang
@@ -0,0 +1,13 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    container valid {
+        leaf invalid-interval {
+            type "uint16";
+            units "seconds";
+            status current;
+            reference "RFC 6020";
+        }
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/ModuleSubStatementDescription.yang b/utils/yangutils/plugin/src/test/resources/ModuleSubStatementDescription.yang
new file mode 100644
index 0000000..02643b1
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ModuleSubStatementDescription.yang
@@ -0,0 +1,6 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    description "Interval before a route is declared invalid";
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/ModuleSubStatementList.yang b/utils/yangutils/plugin/src/test/resources/ModuleSubStatementList.yang
new file mode 100644
index 0000000..1bb3bf5
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ModuleSubStatementList.yang
@@ -0,0 +1,14 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    list valid {
+        key "invalid-interval";
+        leaf invalid-interval {
+            type "uint16";
+            units "seconds";
+            status current;
+            reference "RFC 6020";
+        }
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/ModuleSubStatementMandatory.yang b/utils/yangutils/plugin/src/test/resources/ModuleSubStatementMandatory.yang
new file mode 100644
index 0000000..8f6e1a1
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ModuleSubStatementMandatory.yang
@@ -0,0 +1,6 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    mandatory false;
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/ModuleSubStatementReference.yang b/utils/yangutils/plugin/src/test/resources/ModuleSubStatementReference.yang
new file mode 100644
index 0000000..20b2fb6
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ModuleSubStatementReference.yang
@@ -0,0 +1,6 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    reference "RFC 6020";
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/ModuleSubStatementStatus.yang b/utils/yangutils/plugin/src/test/resources/ModuleSubStatementStatus.yang
new file mode 100644
index 0000000..3739096
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ModuleSubStatementStatus.yang
@@ -0,0 +1,6 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    status current;
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/ModuleSubStatementUnits.yang b/utils/yangutils/plugin/src/test/resources/ModuleSubStatementUnits.yang
new file mode 100644
index 0000000..d9381ec
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ModuleSubStatementUnits.yang
@@ -0,0 +1,7 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    type "uint16";
+    units "seconds";
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/ModuleValidEntry.yang b/utils/yangutils/plugin/src/test/resources/ModuleValidEntry.yang
new file mode 100644
index 0000000..439ded8
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ModuleValidEntry.yang
@@ -0,0 +1,5 @@
+module Test {
+yang-version 1;
+namespace urn:ietf:params:xml:ns:yang:ietf-ospf;
+prefix On;
+}
diff --git a/utils/yangutils/plugin/src/test/resources/ModuleWithDuplicateLeaf.yang b/utils/yangutils/plugin/src/test/resources/ModuleWithDuplicateLeaf.yang
new file mode 100644
index 0000000..2c3ecbc
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ModuleWithDuplicateLeaf.yang
@@ -0,0 +1,32 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf invalid-interval {
+        type "uint16";
+        units "seconds";
+        description "Interval before a route is declared invalid";
+        config true;
+        mandatory true;
+        status current;
+        reference "RFC 6020";
+    }
+    leaf valid-interval {
+        type "uint16";
+        units "seconds";
+        description "Interval before a route is declared invalid";
+        config true;
+        mandatory true;
+        status current;
+        reference "RFC 6020";
+    }
+    leaf invalid-interval {
+        type "uint16";
+        units "seconds";
+        description "Interval before a route is declared invalid";
+        config true;
+        mandatory true;
+        status current;
+        reference "RFC 6020";
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/ModuleWithInvalidIdentifier.yang b/utils/yangutils/plugin/src/test/resources/ModuleWithInvalidIdentifier.yang
new file mode 100644
index 0000000..d89340a
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ModuleWithInvalidIdentifier.yang
@@ -0,0 +1,5 @@
+module Test:Test {
+yang-version 1;
+namespace urn:ietf:params:xml:ns:yang:ietf-ospf;
+prefix On;
+}
diff --git a/utils/yangutils/plugin/src/test/resources/MultipleKeyValues.yang b/utils/yangutils/plugin/src/test/resources/MultipleKeyValues.yang
new file mode 100644
index 0000000..a9d25a2
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/MultipleKeyValues.yang
@@ -0,0 +1,20 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    list valid {
+        key "ospf isis";
+        leaf ospf {
+            type "uint16";
+            units "seconds";
+            status current;
+            reference "RFC 6020";
+        }
+        leaf isis {
+            type "uint16";
+            units "seconds";
+            status current;
+            reference "RFC 6020";
+        }
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/MultiplePatternAndLengthRestriction.yang b/utils/yangutils/plugin/src/test/resources/MultiplePatternAndLengthRestriction.yang
new file mode 100644
index 0000000..d971643
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/MultiplePatternAndLengthRestriction.yang
@@ -0,0 +1,19 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf invalid-interval {
+        type hello {
+            pattern "[a-z]";
+            pattern "[A-Z]";
+            length "min..20 | 201..max";
+        }
+    }
+    typedef hello {
+        type string {
+            pattern "[0-9]";
+            pattern "[\n]";
+            length "0..100 | 101..200 | 201..300";
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/MultiplePatternAndLengthRestrictionInValid.yang b/utils/yangutils/plugin/src/test/resources/MultiplePatternAndLengthRestrictionInValid.yang
new file mode 100644
index 0000000..7ba3ef9
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/MultiplePatternAndLengthRestrictionInValid.yang
@@ -0,0 +1,19 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf invalid-interval {
+        type hello {
+            pattern "[a-z]";
+            pattern "[A-Z]";
+            length "min..20 | 100..max";
+        }
+    }
+    typedef hello {
+        type string {
+            pattern "[0-9]";
+            pattern "[\n]";
+            length "0..100 | 101..200 | 201..300";
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/MultiplePatternAndLengthRestrictionValid.yang b/utils/yangutils/plugin/src/test/resources/MultiplePatternAndLengthRestrictionValid.yang
new file mode 100644
index 0000000..161b558
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/MultiplePatternAndLengthRestrictionValid.yang
@@ -0,0 +1,18 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf invalid-interval {
+        type hello {
+            pattern "[a-z]";
+            pattern "[A-Z]";
+            length "min..20 | 100..max";
+        }
+    }
+    typedef hello {
+        type string {
+            pattern "[0-9]";
+            pattern "[\n]";
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/MultiplePatternRestrictionInRefTypeAndTypedef.yang b/utils/yangutils/plugin/src/test/resources/MultiplePatternRestrictionInRefTypeAndTypedef.yang
new file mode 100644
index 0000000..eaa28c5
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/MultiplePatternRestrictionInRefTypeAndTypedef.yang
@@ -0,0 +1,17 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf invalid-interval {
+        type hello {
+            pattern "[a-z]";
+            pattern "[A-Z]";
+        }
+    }
+    typedef hello {
+        type string {
+            pattern "[0-9]";
+            pattern "[\n]";
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/MultiplePatternStatement.yang b/utils/yangutils/plugin/src/test/resources/MultiplePatternStatement.yang
new file mode 100644
index 0000000..7a47bfc
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/MultiplePatternStatement.yang
@@ -0,0 +1,11 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf-list invalid-interval {
+        type string {
+            pattern "[a-zA-Z]";
+            pattern "[a-z]";
+         }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/NamespaceDualEntry.yang b/utils/yangutils/plugin/src/test/resources/NamespaceDualEntry.yang
new file mode 100644
index 0000000..09c9b54
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/NamespaceDualEntry.yang
@@ -0,0 +1,6 @@
+module Test {
+yang-version 1;
+namespace urn:ietf:params:xml:ns:yang:ietf-ospf;
+namespace urn:ietf:params:xml:ns:yang:ietf-segment-routing;
+prefix On;
+}
diff --git a/utils/yangutils/plugin/src/test/resources/NamespaceInDoubleQuotes.yang b/utils/yangutils/plugin/src/test/resources/NamespaceInDoubleQuotes.yang
new file mode 100644
index 0000000..aec0042
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/NamespaceInDoubleQuotes.yang
@@ -0,0 +1,5 @@
+module Test {
+yang-version 1;
+namespace "urn:ietf:params:xml:ns:yang:ietf-ospf";
+prefix On;
+}
diff --git a/utils/yangutils/plugin/src/test/resources/NamespaceNoEntryTest.yang b/utils/yangutils/plugin/src/test/resources/NamespaceNoEntryTest.yang
new file mode 100644
index 0000000..ac30ae4
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/NamespaceNoEntryTest.yang
@@ -0,0 +1,4 @@
+module Test {
+yang-version 1;
+prefix On;
+}
diff --git a/utils/yangutils/plugin/src/test/resources/NamespaceWithConcatenationTest.yang b/utils/yangutils/plugin/src/test/resources/NamespaceWithConcatenationTest.yang
new file mode 100644
index 0000000..c9ac4b0
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/NamespaceWithConcatenationTest.yang
@@ -0,0 +1,6 @@
+module Test {
+yang-version 1;
+namespace "urn:ietf:params:xml:ns:"
+             + "yang:ietf-segment-routing";
+prefix On;
+}
diff --git a/utils/yangutils/plugin/src/test/resources/NamespaceWithInvalidSpaces.yang b/utils/yangutils/plugin/src/test/resources/NamespaceWithInvalidSpaces.yang
new file mode 100644
index 0000000..f8f91c5
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/NamespaceWithInvalidSpaces.yang
@@ -0,0 +1,5 @@
+module Test {
+yang-version 1;
+namespace "urn:ietf:params:xml :ns:yang:ietf-ospf";
+prefix On;
+}
diff --git a/utils/yangutils/plugin/src/test/resources/NamespaceWithoutQuotes.yang b/utils/yangutils/plugin/src/test/resources/NamespaceWithoutQuotes.yang
new file mode 100644
index 0000000..439ded8
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/NamespaceWithoutQuotes.yang
@@ -0,0 +1,5 @@
+module Test {
+yang-version 1;
+namespace urn:ietf:params:xml:ns:yang:ietf-ospf;
+prefix On;
+}
diff --git a/utils/yangutils/plugin/src/test/resources/NoConfigContainerSubStatementContainer.yang b/utils/yangutils/plugin/src/test/resources/NoConfigContainerSubStatementContainer.yang
new file mode 100644
index 0000000..1aded2d
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/NoConfigContainerSubStatementContainer.yang
@@ -0,0 +1,15 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    container hello {
+        container valid {
+            leaf invalid-interval {
+                type "uint16";
+                units "seconds";
+                status current;
+                reference "RFC 6020";
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/NoConfigContainerSubStatementLeaf.yang b/utils/yangutils/plugin/src/test/resources/NoConfigContainerSubStatementLeaf.yang
new file mode 100644
index 0000000..35a91ad
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/NoConfigContainerSubStatementLeaf.yang
@@ -0,0 +1,13 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    container valid {
+        leaf invalid-interval {
+            type "uint16";
+            units "seconds";
+            status current;
+            reference "RFC 6020";
+        }
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/NoConfigContainerSubStatementLeafList.yang b/utils/yangutils/plugin/src/test/resources/NoConfigContainerSubStatementLeafList.yang
new file mode 100644
index 0000000..79687c2
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/NoConfigContainerSubStatementLeafList.yang
@@ -0,0 +1,13 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    container valid {
+        leaf-list invalid-interval {
+            type "uint16";
+            units "seconds";
+            status current;
+            reference "RFC 6020";
+        }
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/NoConfigContainerSubStatementList.yang b/utils/yangutils/plugin/src/test/resources/NoConfigContainerSubStatementList.yang
new file mode 100644
index 0000000..f10c686
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/NoConfigContainerSubStatementList.yang
@@ -0,0 +1,16 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    container hello {
+        list valid {
+            key "invalid-interval";
+            leaf invalid-interval {
+                type "uint16";
+                units "seconds";
+                status current;
+                reference "RFC 6020";
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/NoConfigListSubStatementContainer.yang b/utils/yangutils/plugin/src/test/resources/NoConfigListSubStatementContainer.yang
new file mode 100644
index 0000000..19b4291
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/NoConfigListSubStatementContainer.yang
@@ -0,0 +1,22 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    list list1 {
+        key "invalid-interval";
+        leaf invalid-interval {
+            type "uint16";
+            units "seconds";
+            status current;
+            reference "RFC 6020";
+        }
+        container container1 {
+            leaf leaf1 {
+                type "uint16";
+                units "seconds";
+                status current;
+                reference "RFC 6020";
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/NoConfigListSubStatementLeaf.yang b/utils/yangutils/plugin/src/test/resources/NoConfigListSubStatementLeaf.yang
new file mode 100644
index 0000000..1bb3bf5
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/NoConfigListSubStatementLeaf.yang
@@ -0,0 +1,14 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    list valid {
+        key "invalid-interval";
+        leaf invalid-interval {
+            type "uint16";
+            units "seconds";
+            status current;
+            reference "RFC 6020";
+        }
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/NoConfigListSubStatementLeafList.yang b/utils/yangutils/plugin/src/test/resources/NoConfigListSubStatementLeafList.yang
new file mode 100644
index 0000000..e70155e
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/NoConfigListSubStatementLeafList.yang
@@ -0,0 +1,14 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    list valid {
+        key "invalid-interval";
+        leaf-list invalid-interval {
+            type "uint16";
+            units "seconds";
+            status current;
+            reference "RFC 6020";
+        }
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/NoConfigListSubStatementList.yang b/utils/yangutils/plugin/src/test/resources/NoConfigListSubStatementList.yang
new file mode 100644
index 0000000..4de40cb
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/NoConfigListSubStatementList.yang
@@ -0,0 +1,23 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    list valid {
+        key "invalid-interval";
+        leaf invalid-interval {
+            type "uint16";
+            units "seconds";
+            status current;
+            reference "RFC 6020";
+        }
+        list list1 {
+            key "leaf1";
+            leaf leaf1 {
+                type "uint16";
+                units "seconds";
+                status current;
+                reference "RFC 6020";
+            }
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/NotificationTest.yang b/utils/yangutils/plugin/src/test/resources/NotificationTest.yang
new file mode 100644
index 0000000..f199dbd
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/NotificationTest.yang
@@ -0,0 +1,13 @@
+module NotificationTest {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    notification test {
+        leaf type {
+            type string;
+        }
+        leaf severity {
+            type string;
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/OrderedByStatement.yang b/utils/yangutils/plugin/src/test/resources/OrderedByStatement.yang
new file mode 100644
index 0000000..f6b4336
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/OrderedByStatement.yang
@@ -0,0 +1,10 @@
+module rock {
+    namespace "http://example.net/rock";
+    prefix "rock";
+    leaf-list cipher  {
+         type string;
+         ordered-by user;
+         description "A list of ciphers";
+    }
+}
+
diff --git a/utils/yangutils/plugin/src/test/resources/OrganizationDualEntry.yang b/utils/yangutils/plugin/src/test/resources/OrganizationDualEntry.yang
new file mode 100644
index 0000000..64bf23d
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/OrganizationDualEntry.yang
@@ -0,0 +1,18 @@
+module Test {
+yang-version 1;
+namespace urn:ietf:params:xml:ns:yang:ietf-ospf;
+prefix On;
+import ietf {
+prefix On2;
+revision-date 2015-02-03;
+}
+include itut {
+revision-date 2016-02-03;
+}
+include sdn {
+revision-date 2014-02-03;
+}
+contact "Test";
+organization "IETF SPRING Working Group";
+organization "ITUT SPRING Working Group";
+}
diff --git a/utils/yangutils/plugin/src/test/resources/OrganizationInvalidOrder.yang b/utils/yangutils/plugin/src/test/resources/OrganizationInvalidOrder.yang
new file mode 100644
index 0000000..333f2e5
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/OrganizationInvalidOrder.yang
@@ -0,0 +1,17 @@
+module Test {
+yang-version 1;
+organization "ONOS";
+namespace urn:ietf:params:xml:ns:yang:ietf-ospf;
+prefix On;
+import ietf {
+prefix On2;
+revision-date 2015-02-03;
+}
+include itut; {
+revision-date 2016-02-03;
+}
+include sdn {
+revision-date 2014-02-03;
+}
+contact "Test";
+}
diff --git a/utils/yangutils/plugin/src/test/resources/OrganizationMissingValue.yang b/utils/yangutils/plugin/src/test/resources/OrganizationMissingValue.yang
new file mode 100644
index 0000000..e9e3f46
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/OrganizationMissingValue.yang
@@ -0,0 +1,17 @@
+module Test {
+yang-version 1;
+namespace urn:ietf:params:xml:ns:yang:ietf-ospf;
+prefix On;
+import ietf {
+prefix On2;
+revision-date 2015-02-03;
+}
+include itut {
+revision-date 2016-02-03;
+}
+include sdn {
+revision-date 2014-02-03;
+}
+contact "Test";
+organization ;
+}
diff --git a/utils/yangutils/plugin/src/test/resources/OrganizationValidEntry.yang b/utils/yangutils/plugin/src/test/resources/OrganizationValidEntry.yang
new file mode 100644
index 0000000..25ae1ec
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/OrganizationValidEntry.yang
@@ -0,0 +1,17 @@
+module Test {
+yang-version 1;
+namespace urn:ietf:params:xml:ns:yang:ietf-ospf;
+prefix On;
+import ietf {
+prefix On2;
+revision-date 2015-02-03;
+}
+include itut {
+revision-date 2016-02-03;
+}
+include sdn {
+revision-date 2014-02-03;
+}
+contact "Test";
+organization "IETF SPRING Working Group";
+}
diff --git a/utils/yangutils/plugin/src/test/resources/OutputStatementWithDataDefinition.yang b/utils/yangutils/plugin/src/test/resources/OutputStatementWithDataDefinition.yang
new file mode 100644
index 0000000..527b399
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/OutputStatementWithDataDefinition.yang
@@ -0,0 +1,28 @@
+module rock {
+    namespace "http://example.net/rock";
+    prefix "rock";
+
+    rpc activate-software-image {
+        description "description";
+        output {
+            leaf image-name {
+                type string;
+            }
+            list ospf {
+                key "invalid-interval";
+                config true;
+                max-elements 10;
+                min-elements 3;
+                leaf invalid-interval {
+                    type uint16;
+                }
+            }
+            container isis {
+               config true;
+               leaf invalid-interval {
+                   type uint16;
+               }
+           }
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/OutputStatementWithTypedef.yang b/utils/yangutils/plugin/src/test/resources/OutputStatementWithTypedef.yang
new file mode 100644
index 0000000..6027c2d
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/OutputStatementWithTypedef.yang
@@ -0,0 +1,17 @@
+module rock {
+    namespace "http://example.net/rock";
+    prefix "rock";
+
+    rpc activate-software-image {
+        description "description";
+        output {
+            leaf image-name {
+                type string;
+            }
+            typedef my-type {
+                status deprecated;
+                type int32;
+            }
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/PatternRestrictionInRefType.yang b/utils/yangutils/plugin/src/test/resources/PatternRestrictionInRefType.yang
new file mode 100644
index 0000000..189177d
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/PatternRestrictionInRefType.yang
@@ -0,0 +1,13 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf invalid-interval {
+        type hello {
+            pattern "[a-zA-Z]";
+        }
+    }
+    typedef hello {
+        type string;
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/PatternRestrictionInRefTypeAndTypedef.yang b/utils/yangutils/plugin/src/test/resources/PatternRestrictionInRefTypeAndTypedef.yang
new file mode 100644
index 0000000..e01b224
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/PatternRestrictionInRefTypeAndTypedef.yang
@@ -0,0 +1,15 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf invalid-interval {
+        type hello {
+            pattern "[a-zA-Z]";
+        }
+    }
+    typedef hello {
+        type string {
+            pattern "[0-9]";
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/PatternRestrictionInTypedef.yang b/utils/yangutils/plugin/src/test/resources/PatternRestrictionInTypedef.yang
new file mode 100644
index 0000000..7875504
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/PatternRestrictionInTypedef.yang
@@ -0,0 +1,13 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf invalid-interval {
+        type hello;
+    }
+    typedef hello {
+        type string {
+            pattern "[a-zA-Z]";
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/PatternStatementInsideLeafList.yang b/utils/yangutils/plugin/src/test/resources/PatternStatementInsideLeafList.yang
new file mode 100644
index 0000000..d21c0f6
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/PatternStatementInsideLeafList.yang
@@ -0,0 +1,10 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf-list invalid-interval {
+        type string {
+            pattern "[a-zA-Z]";
+         }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/PatternStatementInsideTypeDef.yang b/utils/yangutils/plugin/src/test/resources/PatternStatementInsideTypeDef.yang
new file mode 100644
index 0000000..edb625e
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/PatternStatementInsideTypeDef.yang
@@ -0,0 +1,15 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    typedef invalid-interval {
+        type string {
+            pattern "[a-zA-Z]";
+         }
+    }
+    leaf xyz {
+       type invalid-interval {
+           pattern "[a-z]";
+       }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/PatternStatementWithPlus.yang b/utils/yangutils/plugin/src/test/resources/PatternStatementWithPlus.yang
new file mode 100644
index 0000000..417e1d1
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/PatternStatementWithPlus.yang
@@ -0,0 +1,10 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf-list invalid-interval {
+        type string {
+            pattern "-[0-9]+|[0-9]+";
+         }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/PatternSubStatements.yang b/utils/yangutils/plugin/src/test/resources/PatternSubStatements.yang
new file mode 100644
index 0000000..3e792c6
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/PatternSubStatements.yang
@@ -0,0 +1,13 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf invalid-interval {
+        type string {
+            pattern "[a-zA-Z]" {
+                description "pattern description";
+                reference "pattern reference";
+            }
+         }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/PositionDuplication.yang b/utils/yangutils/plugin/src/test/resources/PositionDuplication.yang
new file mode 100644
index 0000000..81eeb16
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/PositionDuplication.yang
@@ -0,0 +1,18 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+     leaf mybits {
+         type bits {
+             bit disable-nagle {
+                 position 0;
+             }
+             bit auto-sense-speed {
+                 position 1;
+             }
+             bit Ten-Mb-only {
+                 position 1;
+             }
+         }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/PositionImplicitAndExplicit.yang b/utils/yangutils/plugin/src/test/resources/PositionImplicitAndExplicit.yang
new file mode 100644
index 0000000..bef9712
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/PositionImplicitAndExplicit.yang
@@ -0,0 +1,15 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf mybits {
+        type bits {
+            bit disable-nagle;
+            bit auto-sense-speed {
+                position 1;
+            }
+            bit Ten-Mb-only;
+        }
+    }
+}
+
diff --git a/utils/yangutils/plugin/src/test/resources/PositionImplicitAndExplicitDuplication.yang b/utils/yangutils/plugin/src/test/resources/PositionImplicitAndExplicitDuplication.yang
new file mode 100644
index 0000000..30b81ab
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/PositionImplicitAndExplicitDuplication.yang
@@ -0,0 +1,15 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+     leaf mybits {
+         type bits {
+             bit disable-nagle;
+             bit auto-sense-speed {
+                 position 0;
+             }
+             bit Ten-Mb-only;
+             }
+         }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/PositionNegativeValue.yang b/utils/yangutils/plugin/src/test/resources/PositionNegativeValue.yang
new file mode 100644
index 0000000..60330e0
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/PositionNegativeValue.yang
@@ -0,0 +1,15 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+     leaf mybits {
+         type bits {
+             bit disable-nagle;
+             bit auto-sense-speed {
+                 position -2;
+             }
+             bit Ten-Mb-only;
+             }
+         }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/PositionStatement.yang b/utils/yangutils/plugin/src/test/resources/PositionStatement.yang
new file mode 100644
index 0000000..afa0a4c
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/PositionStatement.yang
@@ -0,0 +1,18 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf mybits {
+        type bits {
+            bit disable-nagle {
+                position 0;
+            }
+            bit auto-sense-speed {
+                position 1;
+            }
+            bit Ten-Mb-only {
+                position 2;
+            }
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/PositionWithDoubleQuotes.yang b/utils/yangutils/plugin/src/test/resources/PositionWithDoubleQuotes.yang
new file mode 100644
index 0000000..0c9d358
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/PositionWithDoubleQuotes.yang
@@ -0,0 +1,18 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+     leaf mybits {
+         type bits {
+             bit disable-nagle {
+                 position "0";
+             }
+             bit auto-sense-speed {
+                 position "1";
+             }
+             bit Ten-Mb-only {
+                 position "2";
+             }
+         }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/PrefixDualEntry.yang b/utils/yangutils/plugin/src/test/resources/PrefixDualEntry.yang
new file mode 100644
index 0000000..e999774
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/PrefixDualEntry.yang
@@ -0,0 +1,18 @@
+module Test {
+yang-version 1;
+namespace urn:ietf:params:xml:ns:yang:ietf-ospf;
+prefix On;
+import ietf {
+prefix On2;
+prefix On3;
+revision-date 2015-02-03;
+}
+include itut {
+revision-date 2016-02-03;
+}
+include sdn {
+revision-date 2014-02-03;
+}
+contact "Test";
+organization "ONOS";
+}
diff --git a/utils/yangutils/plugin/src/test/resources/PrefixInvalidValue.yang b/utils/yangutils/plugin/src/test/resources/PrefixInvalidValue.yang
new file mode 100644
index 0000000..40f7617
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/PrefixInvalidValue.yang
@@ -0,0 +1,17 @@
+module Test {
+yang-version 1;
+namespace urn:ietf:params:xml:ns:yang:ietf-ospf;
+prefix -On;
+import ietf {
+prefix On2;
+revision-date 2015-02-03;
+}
+include itut {
+revision-date 2016-02-03;
+}
+include sdn {
+revision-date 2014-02-03;
+}
+contact "Test";
+organization "ONOS";
+}
diff --git a/utils/yangutils/plugin/src/test/resources/PrefixMissingValue.yang b/utils/yangutils/plugin/src/test/resources/PrefixMissingValue.yang
new file mode 100644
index 0000000..4d92ee1
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/PrefixMissingValue.yang
@@ -0,0 +1,17 @@
+module Test {
+yang-version 1;
+namespace urn:ietf:params:xml:ns:yang:ietf-ospf;
+prefix ;
+import ietf {
+prefix On2;
+revision-date 2015-02-03;
+}
+include itut {
+revision-date 2016-02-03;
+}
+include sdn {
+revision-date 2014-02-03;
+}
+contact "Test";
+organization "ONOS";
+}
diff --git a/utils/yangutils/plugin/src/test/resources/PrefixOrder.yang b/utils/yangutils/plugin/src/test/resources/PrefixOrder.yang
new file mode 100644
index 0000000..d14e8b1
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/PrefixOrder.yang
@@ -0,0 +1,17 @@
+module Test {
+yang-version 1;
+namespace urn:ietf:params:xml:ns:yang:ietf-ospf;
+import ietf {
+prefix On2;
+revision-date 2015-02-03;
+}
+prefix test;
+include itut {
+revision-date 2016-02-03;
+}
+include sdn {
+revision-date 2014-02-03;
+}
+contact "Test";
+organization "ONOS";
+}
diff --git a/utils/yangutils/plugin/src/test/resources/PrefixValidEntry.yang b/utils/yangutils/plugin/src/test/resources/PrefixValidEntry.yang
new file mode 100644
index 0000000..826dee4
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/PrefixValidEntry.yang
@@ -0,0 +1,17 @@
+module Test {
+yang-version 1;
+namespace urn:ietf:params:xml:ns:yang:ietf-ospf;
+prefix On;
+import ietf {
+prefix On2;
+revision-date 2015-02-03;
+}
+include itut {
+revision-date 2016-02-03;
+}
+include sdn {
+revision-date 2014-02-03;
+}
+contact "Test";
+organization "ONOS";
+}
diff --git a/utils/yangutils/plugin/src/test/resources/PrefixWithDoubleQuotes.yang b/utils/yangutils/plugin/src/test/resources/PrefixWithDoubleQuotes.yang
new file mode 100644
index 0000000..e9590f1
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/PrefixWithDoubleQuotes.yang
@@ -0,0 +1,17 @@
+module Test {
+yang-version 1;
+namespace urn:ietf:params:xml:ns:yang:ietf-ospf;
+prefix "On";
+import ietf {
+prefix On2;
+revision-date 2015-02-03;
+}
+include itut {
+revision-date 2016-02-03;
+}
+include sdn {
+revision-date 2014-02-03;
+}
+contact "Test";
+organization "ONOS";
+}
diff --git a/utils/yangutils/plugin/src/test/resources/PresenceDefaultValue.yang b/utils/yangutils/plugin/src/test/resources/PresenceDefaultValue.yang
new file mode 100644
index 0000000..6418e20
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/PresenceDefaultValue.yang
@@ -0,0 +1,13 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    container valid {
+        leaf ospf {
+            type "uint16";
+            units "seconds";
+            status current;
+            reference "RFC 6020";
+        }
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/PresenceWithoutStatementEnd.yang b/utils/yangutils/plugin/src/test/resources/PresenceWithoutStatementEnd.yang
new file mode 100644
index 0000000..1427c5f
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/PresenceWithoutStatementEnd.yang
@@ -0,0 +1,14 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    container valid {
+        presence "invalid"
+        leaf invalid-interval {
+            type "uint16";
+            units "seconds";
+            status current;
+            reference "RFC 6020";
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/ProcessFileWithExtraBrace.yang b/utils/yangutils/plugin/src/test/resources/ProcessFileWithExtraBrace.yang
new file mode 100644
index 0000000..ca3f0d0
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ProcessFileWithExtraBrace.yang
@@ -0,0 +1,15 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+        container food {
+            choice snack {
+                list sports-arena {
+                }
+            }
+        }
+    }
+}
+}
+}
+}
diff --git a/utils/yangutils/plugin/src/test/resources/ProcessFileWithExtraBraceInBetween.yang b/utils/yangutils/plugin/src/test/resources/ProcessFileWithExtraBraceInBetween.yang
new file mode 100644
index 0000000..580d270
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ProcessFileWithExtraBraceInBetween.yang
@@ -0,0 +1,35 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    import ietf-yang-types {
+        prefix "P";
+    }
+    grouping Percentage {
+        leaf hello{
+            type string;
+        }
+        leaf invalid1{
+            type string;
+        }
+        }
+        leaf invalid2{
+            type string;
+        }
+    }
+    container ospf {
+        list valid {
+            key "invalid";
+            leaf invalid{
+                type string;
+            }
+            uses Ant:FirstClass;
+            grouping FirstClass {
+                uses P:PassingClass;
+            }
+        }
+        grouping PassingClass {
+            uses Ant:Percentage;
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/ProcessFileWithExtraLeaf.yang b/utils/yangutils/plugin/src/test/resources/ProcessFileWithExtraLeaf.yang
new file mode 100644
index 0000000..5624b7a
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ProcessFileWithExtraLeaf.yang
@@ -0,0 +1,13 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    container food {
+        choice snack {
+            list sports-arena {
+            }
+        }
+    }
+}
+leaf invalid {
+
diff --git a/utils/yangutils/plugin/src/test/resources/RangeRestrictionInRefType.yang b/utils/yangutils/plugin/src/test/resources/RangeRestrictionInRefType.yang
new file mode 100644
index 0000000..da396fa
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/RangeRestrictionInRefType.yang
@@ -0,0 +1,13 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf invalid-interval {
+        type hello {
+            range "1..4 | 10..20";
+        }
+    }
+    typedef hello {
+        type int32;
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/RangeRestrictionInRefTypeAndTypedefInValid.yang b/utils/yangutils/plugin/src/test/resources/RangeRestrictionInRefTypeAndTypedefInValid.yang
new file mode 100644
index 0000000..f45f1ee
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/RangeRestrictionInRefTypeAndTypedefInValid.yang
@@ -0,0 +1,15 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf invalid-interval {
+        type hello {
+            range "min..4 | min..max";
+        }
+    }
+    typedef hello {
+        type int32 {
+            range "1..4 | 10..20";
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/RangeRestrictionInRefTypeAndTypedefValid.yang b/utils/yangutils/plugin/src/test/resources/RangeRestrictionInRefTypeAndTypedefValid.yang
new file mode 100644
index 0000000..b0af767
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/RangeRestrictionInRefTypeAndTypedefValid.yang
@@ -0,0 +1,15 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf invalid-interval {
+        type hello {
+            range "min..4 | 10..max";
+        }
+    }
+    typedef hello {
+        type int32 {
+            range "1..4 | 10..20";
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/RangeRestrictionInString.yang b/utils/yangutils/plugin/src/test/resources/RangeRestrictionInString.yang
new file mode 100644
index 0000000..f167230
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/RangeRestrictionInString.yang
@@ -0,0 +1,13 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf invalid-interval {
+        type hello;
+    }
+    typedef hello {
+        type string {
+            range "1..4 | 10..20";
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/RangeRestrictionInStringInRefType.yang b/utils/yangutils/plugin/src/test/resources/RangeRestrictionInStringInRefType.yang
new file mode 100644
index 0000000..c08635f
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/RangeRestrictionInStringInRefType.yang
@@ -0,0 +1,13 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf invalid-interval {
+        type hello {
+            range "1..4 | 10..20";
+        }
+    }
+    typedef hello {
+        type string;
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/RangeRestrictionInTypedef.yang b/utils/yangutils/plugin/src/test/resources/RangeRestrictionInTypedef.yang
new file mode 100644
index 0000000..0f53d1f
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/RangeRestrictionInTypedef.yang
@@ -0,0 +1,13 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf invalid-interval {
+        type hello;
+    }
+    typedef hello {
+        type int32 {
+            range "1..4 | 10..20";
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/RangeStatementInsideLeafList.yang b/utils/yangutils/plugin/src/test/resources/RangeStatementInsideLeafList.yang
new file mode 100644
index 0000000..9f5808d
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/RangeStatementInsideLeafList.yang
@@ -0,0 +1,10 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf-list invalid-interval {
+        type int32 {
+            range "1..4 | 10..20";
+         }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/RangeStatementWithSpace.yang b/utils/yangutils/plugin/src/test/resources/RangeStatementWithSpace.yang
new file mode 100644
index 0000000..a41d68a
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/RangeStatementWithSpace.yang
@@ -0,0 +1,11 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf invalid-interval {
+        type int32 {
+            range "                          1                        ..                                        4 |                        10               ..                                          20                  ";
+         }
+    }
+}
+
diff --git a/utils/yangutils/plugin/src/test/resources/RangeSubStatements.yang b/utils/yangutils/plugin/src/test/resources/RangeSubStatements.yang
new file mode 100644
index 0000000..4b57bd0
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/RangeSubStatements.yang
@@ -0,0 +1,14 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf invalid-interval {
+        type int32 {
+            range "1..4 | 10..20" {
+                description "range description";
+                reference "range reference";
+            }
+         }
+    }
+}
+
diff --git a/utils/yangutils/plugin/src/test/resources/RangeWithInvalidIntegerPattern.yang b/utils/yangutils/plugin/src/test/resources/RangeWithInvalidIntegerPattern.yang
new file mode 100644
index 0000000..60c7992
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/RangeWithInvalidIntegerPattern.yang
@@ -0,0 +1,10 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf-list invalid-interval {
+        type int32 {
+            range "a..z";
+         }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/RangeWithMinMax.yang b/utils/yangutils/plugin/src/test/resources/RangeWithMinMax.yang
new file mode 100644
index 0000000..373d45e
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/RangeWithMinMax.yang
@@ -0,0 +1,10 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf-list invalid-interval {
+        type int32 {
+            range "min..max";
+         }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/RangeWithOneInterval.yang b/utils/yangutils/plugin/src/test/resources/RangeWithOneInterval.yang
new file mode 100644
index 0000000..85d0288
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/RangeWithOneInterval.yang
@@ -0,0 +1,10 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf-list invalid-interval {
+        type int32 {
+            range "1";
+         }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/ReferenceEmptyStatement.yang b/utils/yangutils/plugin/src/test/resources/ReferenceEmptyStatement.yang
new file mode 100644
index 0000000..ff3525a
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ReferenceEmptyStatement.yang
@@ -0,0 +1,6 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    reference "";
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/ReferenceStatement.yang b/utils/yangutils/plugin/src/test/resources/ReferenceStatement.yang
new file mode 100644
index 0000000..70349a0
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ReferenceStatement.yang
@@ -0,0 +1,14 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf invalid-interval {
+        type "uint16";
+        units "seconds";
+        description "Interval before a route is declared invalid";
+        config true;
+        mandatory true;
+        status current;
+        reference "RFC 6020";
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/ReferenceWithoutStatementEnd.yang b/utils/yangutils/plugin/src/test/resources/ReferenceWithoutStatementEnd.yang
new file mode 100644
index 0000000..f2fcf43
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ReferenceWithoutStatementEnd.yang
@@ -0,0 +1,9 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf invalid-interval {
+        type "uint16";
+        reference "RFC 6020"
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/RevisionAbsence.yang b/utils/yangutils/plugin/src/test/resources/RevisionAbsence.yang
new file mode 100644
index 0000000..eb1d1d9
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/RevisionAbsence.yang
@@ -0,0 +1,5 @@
+module Test {
+yang-version 1;
+namespace urn:ietf:params:xml:ns:yang:ietf-ospf;
+prefix test;
+}
diff --git a/utils/yangutils/plugin/src/test/resources/RevisionDateInQuotesAtImport.yang b/utils/yangutils/plugin/src/test/resources/RevisionDateInQuotesAtImport.yang
new file mode 100644
index 0000000..5f8bcb8
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/RevisionDateInQuotesAtImport.yang
@@ -0,0 +1,17 @@
+module Test {
+yang-version 1;
+namespace urn:ietf:params:xml:ns:yang:ietf-ospf;
+prefix test;
+import ietf {
+prefix On2;
+revision-date "2015-02-03";
+}
+include itut {
+revision-date 2016-02-03;
+}
+include sdn {
+revision-date 2014-02-03;
+}
+contact "Test";
+organization "ONOS";
+}
diff --git a/utils/yangutils/plugin/src/test/resources/RevisionDateInQuotesAtInclude.yang b/utils/yangutils/plugin/src/test/resources/RevisionDateInQuotesAtInclude.yang
new file mode 100644
index 0000000..de405a3
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/RevisionDateInQuotesAtInclude.yang
@@ -0,0 +1,17 @@
+module Test {
+yang-version 1;
+namespace urn:ietf:params:xml:ns:yang:ietf-ospf;
+prefix test;
+import ietf {
+prefix On2;
+revision-date 2015-02-03;
+}
+include itut {
+revision-date "2016-02-03";
+}
+include sdn {
+revision-date 2014-02-03;
+}
+contact "Test";
+organization "ONOS";
+}
diff --git a/utils/yangutils/plugin/src/test/resources/RevisionDateInvalid.yang b/utils/yangutils/plugin/src/test/resources/RevisionDateInvalid.yang
new file mode 100644
index 0000000..c219d11
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/RevisionDateInvalid.yang
@@ -0,0 +1,17 @@
+module Test {
+yang-version 1;
+namespace urn:ietf:params:xml:ns:yang:ietf-ospf;
+prefix test;
+import ietf {
+prefix On2;
+revision-date 2015-02-30;
+}
+include itut {
+revision-date 2016-02-03;
+}
+include sdn {
+revision-date 2014-02-03;
+}
+contact "Test";
+organization "ONOS";
+}
diff --git a/utils/yangutils/plugin/src/test/resources/RevisionDateInvalidFormat.yang b/utils/yangutils/plugin/src/test/resources/RevisionDateInvalidFormat.yang
new file mode 100644
index 0000000..8a6c717
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/RevisionDateInvalidFormat.yang
@@ -0,0 +1,17 @@
+module Test {
+yang-version 1;
+namespace urn:ietf:params:xml:ns:yang:ietf-ospf;
+prefix test;
+import ietf {
+prefix On2;
+revision-date 15-02-03;
+}
+include itut {
+revision-date 2016-02-03;
+}
+include sdn {
+revision-date 2014-02-03;
+}
+contact "Test";
+organization "ONOS";
+}
diff --git a/utils/yangutils/plugin/src/test/resources/RevisionDateInvalidSyntaxAtImport.yang b/utils/yangutils/plugin/src/test/resources/RevisionDateInvalidSyntaxAtImport.yang
new file mode 100644
index 0000000..df726bf
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/RevisionDateInvalidSyntaxAtImport.yang
@@ -0,0 +1,17 @@
+module Test {
+yang-version 1;
+namespace urn:ietf:params:xml:ns:yang:ietf-ospf;
+prefix test;
+import ietf {
+prefix On2;
+revision-date 2015/02/03;
+}
+include itut {
+revision-date 2016-02-03;
+}
+include sdn {
+revision-date 2014-02-03;
+}
+contact "Test";
+organization "ONOS";
+}
diff --git a/utils/yangutils/plugin/src/test/resources/RevisionDateInvalidSyntaxAtInclude.yang b/utils/yangutils/plugin/src/test/resources/RevisionDateInvalidSyntaxAtInclude.yang
new file mode 100644
index 0000000..ea5631e
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/RevisionDateInvalidSyntaxAtInclude.yang
@@ -0,0 +1,17 @@
+module Test {
+yang-version 1;
+namespace urn:ietf:params:xml:ns:yang:ietf-ospf;
+prefix test;
+import ietf {
+prefix On2;
+revision-date 2015-02-03;
+}
+include itut {
+revision-date 2016/02/03;
+}
+include sdn {
+revision-date 2014-02-03;
+}
+contact "Test";
+organization "ONOS";
+}
diff --git a/utils/yangutils/plugin/src/test/resources/RevisionDateValidEntry.yang b/utils/yangutils/plugin/src/test/resources/RevisionDateValidEntry.yang
new file mode 100644
index 0000000..dbf4d3a
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/RevisionDateValidEntry.yang
@@ -0,0 +1,17 @@
+module Test {
+yang-version 1;
+namespace urn:ietf:params:xml:ns:yang:ietf-ospf;
+prefix test;
+import ietf {
+prefix On2;
+revision-date 2015-02-03;
+}
+include itut {
+revision-date 2016-02-03;
+}
+include sdn {
+revision-date 2014-02-03;
+}
+contact "Test";
+organization "ONOS";
+}
diff --git a/utils/yangutils/plugin/src/test/resources/RevisionInValidOrder.yang b/utils/yangutils/plugin/src/test/resources/RevisionInValidOrder.yang
new file mode 100644
index 0000000..c60d434
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/RevisionInValidOrder.yang
@@ -0,0 +1,9 @@
+module Test {
+yang-version 1;
+namespace urn:ietf:params:xml:ns:yang:ietf-ospf;
+prefix test;
+revision 2016-02-03;
+include itut {
+revision-date 2016-02-03;
+}
+}
diff --git a/utils/yangutils/plugin/src/test/resources/RevisionInValidSyntax.yang b/utils/yangutils/plugin/src/test/resources/RevisionInValidSyntax.yang
new file mode 100644
index 0000000..1795b3e
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/RevisionInValidSyntax.yang
@@ -0,0 +1,8 @@
+module Test {
+yang-version 1;
+namespace urn:ietf:params:xml:ns:yang:ietf-ospf;
+prefix test;
+contact "Test";
+organization "ONOS";
+revision;
+}
diff --git a/utils/yangutils/plugin/src/test/resources/RevisionNoOptionalParameter.yang b/utils/yangutils/plugin/src/test/resources/RevisionNoOptionalParameter.yang
new file mode 100644
index 0000000..664204e
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/RevisionNoOptionalParameter.yang
@@ -0,0 +1,8 @@
+module Test {
+yang-version 1;
+namespace urn:ietf:params:xml:ns:yang:ietf-ospf;
+prefix test;
+contact "Test";
+organization "ONOS";
+revision 2016-02-03;
+}
diff --git a/utils/yangutils/plugin/src/test/resources/RevisionSubStatementReference.yang b/utils/yangutils/plugin/src/test/resources/RevisionSubStatementReference.yang
new file mode 100644
index 0000000..d1ada14
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/RevisionSubStatementReference.yang
@@ -0,0 +1,9 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    description "module description";
+    revision 2007-06-09 {
+        reference "revision reference";
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/RevisionSubStatementRevision.yang b/utils/yangutils/plugin/src/test/resources/RevisionSubStatementRevision.yang
new file mode 100644
index 0000000..3d1daa2
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/RevisionSubStatementRevision.yang
@@ -0,0 +1,10 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    description "module description";
+    revision 2007-06-09 {
+        description "revision description";
+    }
+}
+
diff --git a/utils/yangutils/plugin/src/test/resources/RpcTranslator.yang b/utils/yangutils/plugin/src/test/resources/RpcTranslator.yang
new file mode 100644
index 0000000..2f0616e
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/RpcTranslator.yang
@@ -0,0 +1,25 @@
+module Sfc {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf test{
+        type string;
+    }
+    container my-container{
+    leaf my-val{
+            type string;
+        }
+    }
+    rpc SFP {
+        input {
+            leaf port {
+                type string;
+            }
+        }
+        output {
+            leaf path {
+                type string;
+            }
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/SelfFileLinkingTypedefAtMiddleLevelAfterParentHolder.yang b/utils/yangutils/plugin/src/test/resources/SelfFileLinkingTypedefAtMiddleLevelAfterParentHolder.yang
new file mode 100644
index 0000000..812a528
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/SelfFileLinkingTypedefAtMiddleLevelAfterParentHolder.yang
@@ -0,0 +1,16 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    container ospf {
+        list valid {
+            key "invalid-interval";
+            leaf invalid-interval {
+                type hello;
+            }
+        }
+        typedef hello {
+            type string;
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/SelfFileLinkingTypedefAtRootIsAfterContainerHavingType.yang b/utils/yangutils/plugin/src/test/resources/SelfFileLinkingTypedefAtRootIsAfterContainerHavingType.yang
new file mode 100644
index 0000000..10ccab6
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/SelfFileLinkingTypedefAtRootIsAfterContainerHavingType.yang
@@ -0,0 +1,16 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    container ospf {
+        list valid {
+            key "invalid-interval";
+            leaf invalid-interval {
+                type hello;
+            }
+        }
+    }
+    typedef hello {
+        type string;
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/SelfFileLinkingTypedefAtRootTypeTwoLevelInHierarchy.yang b/utils/yangutils/plugin/src/test/resources/SelfFileLinkingTypedefAtRootTypeTwoLevelInHierarchy.yang
new file mode 100644
index 0000000..eddb649
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/SelfFileLinkingTypedefAtRootTypeTwoLevelInHierarchy.yang
@@ -0,0 +1,16 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    typedef hello {
+        type string;
+    }
+    container ospf {
+        list valid {
+            key "invalid-interval";
+            leaf invalid-interval {
+                type hello;
+            }
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/SelfFileLinkingTypedefNotFound.yang b/utils/yangutils/plugin/src/test/resources/SelfFileLinkingTypedefNotFound.yang
new file mode 100644
index 0000000..523f0b4
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/SelfFileLinkingTypedefNotFound.yang
@@ -0,0 +1,18 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    container ospf {
+        list valid {
+            key "invalid-interval";
+            leaf invalid-interval {
+                type Ant:hello;
+            }
+        }
+    }
+    container isis {
+        typedef hello {
+            type string;
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/SelfFileLinkingWithGroupingHierarchicalRefUnresolved.yang b/utils/yangutils/plugin/src/test/resources/SelfFileLinkingWithGroupingHierarchicalRefUnresolved.yang
new file mode 100644
index 0000000..cd71621
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/SelfFileLinkingWithGroupingHierarchicalRefUnresolved.yang
@@ -0,0 +1,14 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    import ietf-yang-types {
+        prefix "P";
+    }
+    grouping create {
+        uses P:valid;
+    }
+    container test{
+        uses create;
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/SelfFileLinkingWithGroupingWithSelfAndExternalPrefixMix.yang b/utils/yangutils/plugin/src/test/resources/SelfFileLinkingWithGroupingWithSelfAndExternalPrefixMix.yang
new file mode 100644
index 0000000..b6e3b45
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/SelfFileLinkingWithGroupingWithSelfAndExternalPrefixMix.yang
@@ -0,0 +1,28 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    import ietf-yang-types {
+        prefix "P";
+    }
+    grouping Percentage {
+        leaf hello{
+            type string;
+        }
+    }
+    container ospf {
+        list valid {
+            key "invalid";
+            leaf invalid{
+                type string;
+            }
+            uses Ant:FirstClass;
+            grouping FirstClass {
+                uses P:PassingClass;
+            }
+        }
+        grouping PassingClass {
+            uses Ant:Percentage;
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/SelfFileLinkingWithGroupingWithSelfModulePrefix.yang b/utils/yangutils/plugin/src/test/resources/SelfFileLinkingWithGroupingWithSelfModulePrefix.yang
new file mode 100644
index 0000000..956ba50
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/SelfFileLinkingWithGroupingWithSelfModulePrefix.yang
@@ -0,0 +1,25 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    grouping Percentage {
+        leaf hello{
+            type string;
+        }
+    }
+    container ospf {
+        list valid {
+            key "invalid";
+            leaf invalid{
+                type string;
+            }
+            uses Ant:FirstClass;
+            grouping FirstClass {
+                uses PassingClass;
+            }
+        }
+        grouping PassingClass {
+            uses Ant:Percentage;
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/SelfFileLinkingWithHierarchicalTypeFailureScenario.yang b/utils/yangutils/plugin/src/test/resources/SelfFileLinkingWithHierarchicalTypeFailureScenario.yang
new file mode 100644
index 0000000..d622196
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/SelfFileLinkingWithHierarchicalTypeFailureScenario.yang
@@ -0,0 +1,22 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    typedef Percentage {
+        type Ant:INT;
+    }
+    container ospf {
+        list valid {
+            key "invalid-interval";
+            leaf invalid-interval {
+                type Ant:FirstClass;
+            }
+            typedef FirstClass {
+                type Ant:PassingClass;
+            }
+        }
+        typedef PassingClass {
+            type Percentage;
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/SelfFileLinkingWithTypdefHierarchicalRefUnresolved.yang b/utils/yangutils/plugin/src/test/resources/SelfFileLinkingWithTypdefHierarchicalRefUnresolved.yang
new file mode 100644
index 0000000..a3e4379
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/SelfFileLinkingWithTypdefHierarchicalRefUnresolved.yang
@@ -0,0 +1,25 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    import ietf-yang-types {
+             prefix "P";
+         }
+    typedef Percentage {
+    type P:Per;
+    }
+    container ospf {
+        list valid {
+            key "invalid-interval";
+            leaf invalid-interval {
+                type FirstClass;
+            }
+            typedef FirstClass {
+                type PassingClass;
+            }
+        }
+        typedef PassingClass {
+            type Percentage;
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/SelfFileLinkingWithTypdefHierarchicalReference.yang b/utils/yangutils/plugin/src/test/resources/SelfFileLinkingWithTypdefHierarchicalReference.yang
new file mode 100644
index 0000000..958dc23
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/SelfFileLinkingWithTypdefHierarchicalReference.yang
@@ -0,0 +1,22 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    typedef Percentage {
+    type int32;
+    }
+    container ospf {
+        list valid {
+            key "invalid-interval";
+            leaf invalid-interval {
+                type FirstClass;
+            }
+            typedef FirstClass {
+                type PassingClass;
+            }
+        }
+        typedef PassingClass {
+            type Percentage;
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/SelfFileLinkingWithTypeWithSelfAndExternalPrefixMix.yang b/utils/yangutils/plugin/src/test/resources/SelfFileLinkingWithTypeWithSelfAndExternalPrefixMix.yang
new file mode 100644
index 0000000..d5f346e
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/SelfFileLinkingWithTypeWithSelfAndExternalPrefixMix.yang
@@ -0,0 +1,25 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    import ietf-yang-types {
+             prefix "P";
+         }
+    typedef Percentage {
+    type int32;
+    }
+    container ospf {
+        list valid {
+            key "invalid-interval";
+            leaf invalid-interval {
+                type Ant:FirstClass;
+            }
+            typedef FirstClass {
+                type P:PassingClass;
+            }
+        }
+        typedef PassingClass {
+            type Ant:Percentage;
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/SelfFileLinkingWithTypeWithSelfModulePrefix.yang b/utils/yangutils/plugin/src/test/resources/SelfFileLinkingWithTypeWithSelfModulePrefix.yang
new file mode 100644
index 0000000..4f292b8
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/SelfFileLinkingWithTypeWithSelfModulePrefix.yang
@@ -0,0 +1,22 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    typedef Percentage {
+    type int32;
+    }
+    container ospf {
+        list valid {
+            key "invalid-interval";
+            leaf invalid-interval {
+                type Ant:FirstClass;
+            }
+            typedef FirstClass {
+                type PassingClass;
+            }
+        }
+        typedef PassingClass {
+            type Ant:Percentage;
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/SelfResolutionGroupingHavingSameUsesManyTimes.yang b/utils/yangutils/plugin/src/test/resources/SelfResolutionGroupingHavingSameUsesManyTimes.yang
new file mode 100644
index 0000000..d449adf
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/SelfResolutionGroupingHavingSameUsesManyTimes.yang
@@ -0,0 +1,25 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    container valid {
+    	grouping endpoint {
+             leaf zip-code {
+                 type string;
+             }
+             uses failure;
+	     container hold {
+                 leaf newone {
+                     type string;
+                 }
+                 
+             }
+             uses failure;              
+    	}
+        grouping failure {
+            leaf test {
+                type string;
+            }
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/SelfResolutionGroupingInRpcAndUsesInOutput.yang b/utils/yangutils/plugin/src/test/resources/SelfResolutionGroupingInRpcAndUsesInOutput.yang
new file mode 100644
index 0000000..3589a9f
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/SelfResolutionGroupingInRpcAndUsesInOutput.yang
@@ -0,0 +1,34 @@
+module rock {
+    namespace "http://example.net/rock";
+    prefix "rock";
+
+    rpc rock-the-house {
+        description "description";
+        status current;
+        reference "reference";
+	grouping hello {
+	    list valid {
+        	    key invalid-interval;
+    	            reference "RFC 6020";
+    		    leaf invalid-interval {
+        	    type "uint16";
+        	    units "seconds";
+        	    status current;
+        	    reference "RFC 6020";
+    		    }
+	     }
+         }
+        input {
+             leaf zip-code {
+                 type string;
+             }
+             uses hello;
+        }
+        output {
+             leaf status {
+                 type string;
+             }
+    	     uses hello;
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/SelfResolutionGroupingReferencingItselfFailureScenerio.yang b/utils/yangutils/plugin/src/test/resources/SelfResolutionGroupingReferencingItselfFailureScenerio.yang
new file mode 100644
index 0000000..3e0ba3d
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/SelfResolutionGroupingReferencingItselfFailureScenerio.yang
@@ -0,0 +1,13 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    container valid {
+    	grouping endpoint {
+             leaf zip-code {
+                 type string;
+             }
+             uses endpoint;
+    	}
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/SelfResolutionGroupingWithMultipleUses.yang b/utils/yangutils/plugin/src/test/resources/SelfResolutionGroupingWithMultipleUses.yang
new file mode 100644
index 0000000..906890f
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/SelfResolutionGroupingWithMultipleUses.yang
@@ -0,0 +1,63 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    container valid {
+    	grouping endpoint {
+             leaf zip-code {
+                 type string;
+             }
+             uses first;
+             container design {
+	         uses second;
+	         container correct {
+                     leaf newone {
+                         type string;
+                     }
+                     uses third;
+                 }
+	     }
+             uses fourth;
+             uses fifth;
+    	}
+        uses endpoint;
+        grouping first {
+	    list valid {
+        	    key invalid-interval;
+    	            reference "RFC 6020";
+    		    leaf invalid-interval {
+        	    type "uint16";
+        	    units "seconds";
+        	    status current;
+        	    reference "RFC 6020";
+    		    }
+	     }
+        }
+        grouping second {
+            leaf ink {
+                type int32;
+            }
+        }
+        grouping third {
+            container value {
+                leaf zip-code {
+                    type string;
+                }
+            }
+        }
+        grouping fourth {
+            typedef my-type {
+                status deprecated;
+                type int32;
+            }
+            leaf correct {
+                type my-type;
+            }
+        }
+        grouping fifth {
+            leaf abc {
+                type string;
+            }
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/SelfResolutionNestedGroupingWithUnresolvedUses.yang b/utils/yangutils/plugin/src/test/resources/SelfResolutionNestedGroupingWithUnresolvedUses.yang
new file mode 100644
index 0000000..b2ab735
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/SelfResolutionNestedGroupingWithUnresolvedUses.yang
@@ -0,0 +1,17 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    container test {
+        leaf leaf2 {
+            type string;
+        }
+    	grouping treat {
+            grouping create {
+                grouping mass {
+                }
+            }
+        }
+    }
+    uses Ant:treat;
+}
diff --git a/utils/yangutils/plugin/src/test/resources/SelfResolutionRpcWithOneTypedefAndTwoGroupingUnderDifferentNode.yang b/utils/yangutils/plugin/src/test/resources/SelfResolutionRpcWithOneTypedefAndTwoGroupingUnderDifferentNode.yang
new file mode 100644
index 0000000..91dc763
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/SelfResolutionRpcWithOneTypedefAndTwoGroupingUnderDifferentNode.yang
@@ -0,0 +1,38 @@
+module rock {
+    namespace "http://example.net/rock";
+    prefix "rock";
+
+    rpc rock-the-house {
+        description "description";
+        status current;
+        reference "reference";
+        input {
+            leaf zip-code {
+                type string;
+            }
+             grouping creative {
+                leaf carry {
+                    type string;
+                }
+             }
+        }
+        output {
+             leaf status {
+                 type string;
+             }
+	     grouping creative {
+	        list valid {
+        	    key invalid-interval;
+    		    leaf invalid-interval {
+        	        type "uint16";
+    		    }
+	        }
+             }
+             typedef my-type {
+                 status deprecated;
+                 type int32;
+             }
+             uses creative;
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/SelfResolutionWhenTypeAndTypedefAtRootLevel.yang b/utils/yangutils/plugin/src/test/resources/SelfResolutionWhenTypeAndTypedefAtRootLevel.yang
new file mode 100644
index 0000000..da6795b
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/SelfResolutionWhenTypeAndTypedefAtRootLevel.yang
@@ -0,0 +1,11 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf invalid-interval {
+        type hello;
+    }
+    typedef hello {
+        type string;
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/SelfResolutionWhenTypeAndTypedefAtRootLevelForBinary.yang b/utils/yangutils/plugin/src/test/resources/SelfResolutionWhenTypeAndTypedefAtRootLevelForBinary.yang
new file mode 100644
index 0000000..d6ff30e
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/SelfResolutionWhenTypeAndTypedefAtRootLevelForBinary.yang
@@ -0,0 +1,17 @@
+module ospf {
+     namespace "urn:cisco:params:xml:ns:yang:ospf";
+     // replace with IANA namespace when assigned
+     prefix ospf;
+      revision 2020-10-20 {
+       description
+         "Initial revision.";
+     }
+
+    typedef type14 {
+        type binary;
+    }
+
+    leaf typedef14 {
+       type type14;
+     }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/SelfResolutionWhenTypeReferredTypedefNotDefined.yang b/utils/yangutils/plugin/src/test/resources/SelfResolutionWhenTypeReferredTypedefNotDefined.yang
new file mode 100644
index 0000000..33f90c9
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/SelfResolutionWhenTypeReferredTypedefNotDefined.yang
@@ -0,0 +1,11 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf invalid-interval {
+        type Ant:hello;
+    }
+    typedef hi {
+        type string;
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/SelfResolutionWhenUsesAndGroupingAtRootLevel.yang b/utils/yangutils/plugin/src/test/resources/SelfResolutionWhenUsesAndGroupingAtRootLevel.yang
new file mode 100644
index 0000000..f6e9197
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/SelfResolutionWhenUsesAndGroupingAtRootLevel.yang
@@ -0,0 +1,11 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    uses hello;
+    grouping hello {
+        leaf hello{
+            type string;
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/SelfResolutionWhenUsesAndGroupingAtRootLevelGroupingWithChild.yang b/utils/yangutils/plugin/src/test/resources/SelfResolutionWhenUsesAndGroupingAtRootLevelGroupingWithChild.yang
new file mode 100644
index 0000000..13cc4a5
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/SelfResolutionWhenUsesAndGroupingAtRootLevelGroupingWithChild.yang
@@ -0,0 +1,16 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    uses treat;
+    grouping treat {
+        leaf treat{
+            type string;
+        }
+        container test{
+            leaf leaf2{
+                type string;
+            }
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/ShortCaseListenerWithContainer.yang b/utils/yangutils/plugin/src/test/resources/ShortCaseListenerWithContainer.yang
new file mode 100644
index 0000000..3322a66
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ShortCaseListenerWithContainer.yang
@@ -0,0 +1,14 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    container food {
+        choice snack {
+            container sports-arena {
+                leaf pretzel {
+                    type empty;
+                }
+            }
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/ShortCaseListenerWithList.yang b/utils/yangutils/plugin/src/test/resources/ShortCaseListenerWithList.yang
new file mode 100644
index 0000000..6eeec79
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ShortCaseListenerWithList.yang
@@ -0,0 +1,16 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    container food {
+        choice snack {
+            list sports-arena {
+                key "pretzel";
+                leaf pretzel {
+                    type int32;
+                }
+            }
+        }
+    }
+}
+
diff --git a/utils/yangutils/plugin/src/test/resources/StatusDefaultValue.yang b/utils/yangutils/plugin/src/test/resources/StatusDefaultValue.yang
new file mode 100644
index 0000000..0cc9e36
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/StatusDefaultValue.yang
@@ -0,0 +1,12 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf-list invalid-interval {
+        type "uint16";
+        units "seconds";
+        description "Interval before a route is declared invalid";
+        config true;
+        reference "RFC 6020";
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/StatusInvalidValue.yang b/utils/yangutils/plugin/src/test/resources/StatusInvalidValue.yang
new file mode 100644
index 0000000..253b785
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/StatusInvalidValue.yang
@@ -0,0 +1,9 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+        leaf invalid-interval {
+        type "uint16";
+        status invalid;
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/StatusStatementCurrent.yang b/utils/yangutils/plugin/src/test/resources/StatusStatementCurrent.yang
new file mode 100644
index 0000000..dd9a36d
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/StatusStatementCurrent.yang
@@ -0,0 +1,14 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf invalid-interval {
+        type "uint16";
+        units "seconds";
+        description "Interval before a route is declared invalid";
+        config true;
+        mandatory true;
+        status current;
+        reference "RFC 6020";
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/StatusStatementDeprecated.yang b/utils/yangutils/plugin/src/test/resources/StatusStatementDeprecated.yang
new file mode 100644
index 0000000..9a257b1
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/StatusStatementDeprecated.yang
@@ -0,0 +1,9 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf invalid-interval {
+        type "uint16";
+        status deprecated;
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/StatusStatementObsolete.yang b/utils/yangutils/plugin/src/test/resources/StatusStatementObsolete.yang
new file mode 100644
index 0000000..19325ed
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/StatusStatementObsolete.yang
@@ -0,0 +1,9 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf invalid-interval {
+        type "uint16";
+        status obsolete;
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/StatusWithoutStatementEnd.yang b/utils/yangutils/plugin/src/test/resources/StatusWithoutStatementEnd.yang
new file mode 100644
index 0000000..27a8cfa
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/StatusWithoutStatementEnd.yang
@@ -0,0 +1,9 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf invalid-interval {
+        type "uint16";
+        status current
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/SubModuleInvalidName.yang b/utils/yangutils/plugin/src/test/resources/SubModuleInvalidName.yang
new file mode 100644
index 0000000..7da9397
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/SubModuleInvalidName.yang
@@ -0,0 +1,18 @@
+submodule Test:Test {
+belongs-to ONOS {
+prefix On1;
+}
+yang-version 1;
+import ietf {
+prefix On2;
+revision-date 2015-02-03;
+}
+include itut {
+revision-date 2016-02-03;
+}
+include sdn {
+revision-date 2014-02-03;
+}
+contact "Test";
+organization "ONOS";
+}
diff --git a/utils/yangutils/plugin/src/test/resources/SubModuleOrder.yang b/utils/yangutils/plugin/src/test/resources/SubModuleOrder.yang
new file mode 100644
index 0000000..9779bbb
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/SubModuleOrder.yang
@@ -0,0 +1,18 @@
+submodule Test {
+belongs-to ONOS {
+prefix On1;
+}
+yang-version 1;
+import ietf {
+prefix On2;
+revision-date 2015-02-03;
+}
+include itut {
+revision-date 2016-02-03;
+}
+include sdn {
+revision-date 2014-02-03;
+}
+contact "Test";
+organization "ONOS";
+}
diff --git a/utils/yangutils/plugin/src/test/resources/SubModuleValidEntry.yang b/utils/yangutils/plugin/src/test/resources/SubModuleValidEntry.yang
new file mode 100644
index 0000000..00ecdca
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/SubModuleValidEntry.yang
@@ -0,0 +1,18 @@
+submodule Test {
+yang-version 1;
+belongs-to ONOS {
+prefix On1;
+}
+import ietf {
+prefix On2;
+revision-date 2015-02-03;
+}
+include itut {
+revision-date 2016-02-03;
+}
+include sdn {
+revision-date 2014-02-03;
+}
+contact "Test";
+organization "ONOS";
+}
diff --git a/utils/yangutils/plugin/src/test/resources/SubModuleWithNamespace.yang b/utils/yangutils/plugin/src/test/resources/SubModuleWithNamespace.yang
new file mode 100644
index 0000000..d7a38f7
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/SubModuleWithNamespace.yang
@@ -0,0 +1,19 @@
+submodule Test {
+belongs-to ONOS {
+prefix On1;
+}
+yang-version 1;
+namespace urn:ietf:params:xml:ns:yang:ietf-ospf;
+import ietf {
+prefix On2;
+revision-date 2015-02-03;
+}
+include itut {
+revision-date 2016-02-03;
+}
+include sdn {
+revision-date 2014-02-03;
+}
+contact "Test";
+organization "ONOS";
+}
diff --git a/utils/yangutils/plugin/src/test/resources/SubModuleWithoutBelongsTo.yang b/utils/yangutils/plugin/src/test/resources/SubModuleWithoutBelongsTo.yang
new file mode 100644
index 0000000..4a25209
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/SubModuleWithoutBelongsTo.yang
@@ -0,0 +1,3 @@
+submodule Test {
+yang-version 1;
+}
diff --git a/utils/yangutils/plugin/src/test/resources/SubModuleWithoutVersion.yang b/utils/yangutils/plugin/src/test/resources/SubModuleWithoutVersion.yang
new file mode 100644
index 0000000..f44df8b
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/SubModuleWithoutVersion.yang
@@ -0,0 +1,17 @@
+submodule Test {
+belongs-to ONOS {
+prefix On1;
+}
+import ietf {
+prefix On2;
+revision-date 2015-02-03;
+}
+include itut {
+revision-date 2016-02-03;
+}
+include sdn {
+revision-date 2014-02-03;
+}
+contact "Test";
+organization "ONOS";
+}
diff --git a/utils/yangutils/plugin/src/test/resources/UnionTranslator.yang b/utils/yangutils/plugin/src/test/resources/UnionTranslator.yang
new file mode 100644
index 0000000..f1de318
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/UnionTranslator.yang
@@ -0,0 +1,13 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    container valid {
+        leaf invalid-interval {
+            type union {
+                type int32;
+                type int8;
+            }
+        }
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/UnionWhenTypeInLeaf.yang b/utils/yangutils/plugin/src/test/resources/UnionWhenTypeInLeaf.yang
new file mode 100644
index 0000000..65c0369
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/UnionWhenTypeInLeaf.yang
@@ -0,0 +1,16 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    list valid {
+        key "invalid-interval";
+        leaf invalid-interval {
+            type union {
+                type int32;
+                type enumeration {
+                    enum "unbounded";
+                }
+            }
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/UnionWhenTypeInLeafList.yang b/utils/yangutils/plugin/src/test/resources/UnionWhenTypeInLeafList.yang
new file mode 100644
index 0000000..df2b428
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/UnionWhenTypeInLeafList.yang
@@ -0,0 +1,16 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    list valid {
+        key "invalid-interval";
+        leaf-list invalid-interval {
+            type union {
+            type int32;
+            type enumeration {
+                    enum "unbounded";
+                }
+            }
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/UnionWithEmptyType.yang b/utils/yangutils/plugin/src/test/resources/UnionWithEmptyType.yang
new file mode 100644
index 0000000..81e8795
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/UnionWithEmptyType.yang
@@ -0,0 +1,16 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    list valid {
+        key "invalid-interval";
+        leaf invalid-interval {
+            type union {
+                type empty;
+                type enumeration {
+                    enum "unbounded";
+                }
+            }
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/UnitsDefaultValue.yang b/utils/yangutils/plugin/src/test/resources/UnitsDefaultValue.yang
new file mode 100644
index 0000000..c71d5ea
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/UnitsDefaultValue.yang
@@ -0,0 +1,8 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf invalid-interval {
+        type "uint16";
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/UnitsStatement.yang b/utils/yangutils/plugin/src/test/resources/UnitsStatement.yang
new file mode 100644
index 0000000..70349a0
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/UnitsStatement.yang
@@ -0,0 +1,14 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf invalid-interval {
+        type "uint16";
+        units "seconds";
+        description "Interval before a route is declared invalid";
+        config true;
+        mandatory true;
+        status current;
+        reference "RFC 6020";
+    }
+}
\ No newline at end of file
diff --git a/utils/yangutils/plugin/src/test/resources/UnitsStatementCardinality.yang b/utils/yangutils/plugin/src/test/resources/UnitsStatementCardinality.yang
new file mode 100644
index 0000000..50a2ba0
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/UnitsStatementCardinality.yang
@@ -0,0 +1,10 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf invalid-interval {
+        type "uint16";
+        units "seconds";
+        units "minutes";
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/UnitsStatementOrder.yang b/utils/yangutils/plugin/src/test/resources/UnitsStatementOrder.yang
new file mode 100644
index 0000000..e41e201
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/UnitsStatementOrder.yang
@@ -0,0 +1,14 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf invalid-interval {
+        units "seconds";
+        type "uint16";
+        description "Interval before a route is declared invalid";
+        config true;
+        mandatory true;
+        status current;
+        reference "RFC 6020";
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/UnitsWithoutStatementEnd.yang b/utils/yangutils/plugin/src/test/resources/UnitsWithoutStatementEnd.yang
new file mode 100644
index 0000000..889d7b7
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/UnitsWithoutStatementEnd.yang
@@ -0,0 +1,9 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf invalid-interval {
+        type "uint16";
+        units "seconds"
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/UsesInContainer.yang b/utils/yangutils/plugin/src/test/resources/UsesInContainer.yang
new file mode 100644
index 0000000..df52fd6
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/UsesInContainer.yang
@@ -0,0 +1,14 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    grouping endpoint {
+    }
+    container valid {
+        uses endpoint {
+            description "grouping under test";
+            status current;
+            reference "RFC 6020";
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/UsesInList.yang b/utils/yangutils/plugin/src/test/resources/UsesInList.yang
new file mode 100644
index 0000000..6ac7795
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/UsesInList.yang
@@ -0,0 +1,21 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    import ietf-yang-types {
+             prefix "P";
+         }    
+    grouping endpoint {
+    }
+    list valid {
+        key address;
+        leaf address {
+            type P:ip;
+        }
+        uses endpoint {
+            description "grouping under test";
+            status current;
+            reference "RFC 6020";
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/UsesInModule.yang b/utils/yangutils/plugin/src/test/resources/UsesInModule.yang
new file mode 100644
index 0000000..02b9f09
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/UsesInModule.yang
@@ -0,0 +1,8 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    grouping endpoint {
+    }
+    uses endpoint;
+}
diff --git a/utils/yangutils/plugin/src/test/resources/ValidAugmentStatement.yang b/utils/yangutils/plugin/src/test/resources/ValidAugmentStatement.yang
new file mode 100644
index 0000000..f6c247e
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ValidAugmentStatement.yang
@@ -0,0 +1,17 @@
+module Test {
+    yang-version 1;
+    namespace http://example.com/schema/ds0;
+    prefix On;
+
+    import interface-module {
+        prefix "if";
+    }
+    import ietf-yang-types {
+             prefix "P";
+         }
+    augment "/if:interfaces/if:ifEntry" {
+        leaf ds0ChannelNumber {
+            type P:ChannelNumber;
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/ValidLengthStatement.yang b/utils/yangutils/plugin/src/test/resources/ValidLengthStatement.yang
new file mode 100644
index 0000000..57cb809
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ValidLengthStatement.yang
@@ -0,0 +1,10 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf invalid-interval {
+        type string {
+            length "0..100";
+         }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/ValidNotificationStatement.yang b/utils/yangutils/plugin/src/test/resources/ValidNotificationStatement.yang
new file mode 100644
index 0000000..1e0f144
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ValidNotificationStatement.yang
@@ -0,0 +1,26 @@
+module rock {
+    namespace "http://example.net/rock";
+    prefix "rock";
+
+    import ietf-yang-types {
+             prefix "P";
+         }
+    notification link-failure {
+        description "A link failure has been detected";
+        status deprecated;
+        reference "reference";
+        typedef my-type {
+           status deprecated;
+           type int32;
+        }
+        leaf if-name {
+           type string;
+        }
+        leaf if-admin-status {
+           type P:admin-status;
+        }
+        leaf if-oper-status {
+           type P:oper-status;
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/ValidPatternStatement.yang b/utils/yangutils/plugin/src/test/resources/ValidPatternStatement.yang
new file mode 100644
index 0000000..556db31
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ValidPatternStatement.yang
@@ -0,0 +1,10 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf invalid-interval {
+        type string {
+            pattern "[a-zA-Z]";
+         }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/ValidRangeStatement.yang b/utils/yangutils/plugin/src/test/resources/ValidRangeStatement.yang
new file mode 100644
index 0000000..4243040
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ValidRangeStatement.yang
@@ -0,0 +1,11 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf invalid-interval {
+        type int32 {
+            range "1..4 | 10..20";
+         }
+    }
+}
+
diff --git a/utils/yangutils/plugin/src/test/resources/ValidRpcStatement.yang b/utils/yangutils/plugin/src/test/resources/ValidRpcStatement.yang
new file mode 100644
index 0000000..f188227
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ValidRpcStatement.yang
@@ -0,0 +1,24 @@
+module rock {
+    namespace "http://example.net/rock";
+    prefix "rock";
+
+    rpc rock-the-house {
+        description "description";
+        status current;
+        reference "reference";
+        typedef my-type {
+           status deprecated;
+           type int32;
+        }
+        input {
+            leaf zip-code {
+                type string;
+            }
+        }
+        output {
+             leaf status {
+                 type string;
+             }
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/ValidSameGroupingEntryInModuleAndContainer.yang b/utils/yangutils/plugin/src/test/resources/ValidSameGroupingEntryInModuleAndContainer.yang
new file mode 100644
index 0000000..2580cdd
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ValidSameGroupingEntryInModuleAndContainer.yang
@@ -0,0 +1,23 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    grouping endpoint {
+        leaf address {
+            type ip-address;
+        }
+    leaf port {
+        type port-number;
+        }
+    }
+    container valid {
+        grouping endpoint {
+            leaf address {
+                type ip-address;
+            }
+            leaf port {
+                type port-number;
+            }
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/ValidVersionWithDoubleQuotes.yang b/utils/yangutils/plugin/src/test/resources/ValidVersionWithDoubleQuotes.yang
new file mode 100644
index 0000000..a2c718a
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ValidVersionWithDoubleQuotes.yang
@@ -0,0 +1,5 @@
+module Test {
+yang-version "1";
+namespace urn:ietf:params:xml:ns:yang:ietf-ospf;
+prefix On;
+}
diff --git a/utils/yangutils/plugin/src/test/resources/ValueAndAutoStatement.yang b/utils/yangutils/plugin/src/test/resources/ValueAndAutoStatement.yang
new file mode 100644
index 0000000..89ba403
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ValueAndAutoStatement.yang
@@ -0,0 +1,16 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf speed {
+        type enumeration {
+            enum 10m {
+                value 10;
+            }
+            enum 100m;
+            enum auto {
+                value 1000;
+            }
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/ValueDuplication.yang b/utils/yangutils/plugin/src/test/resources/ValueDuplication.yang
new file mode 100644
index 0000000..339a737
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ValueDuplication.yang
@@ -0,0 +1,18 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf speed {
+        type enumeration {
+          enum 10m {
+	     value 10;
+          }
+          enum 100m {
+	     value 100;
+          }
+          enum auto {
+	     value 10;
+          }
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/ValueExplicitAndAutoDuplication.yang b/utils/yangutils/plugin/src/test/resources/ValueExplicitAndAutoDuplication.yang
new file mode 100644
index 0000000..3e58155
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ValueExplicitAndAutoDuplication.yang
@@ -0,0 +1,16 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf speed {
+        type enumeration {
+          enum 10m {
+	     value 10;
+          }
+          enum 100m;
+          enum auto {
+	     value 11;
+          }
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/ValueStatement.yang b/utils/yangutils/plugin/src/test/resources/ValueStatement.yang
new file mode 100644
index 0000000..f461359
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ValueStatement.yang
@@ -0,0 +1,18 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf speed {
+        type enumeration {
+          enum 10m {
+	     value 10;
+          }
+          enum 100m {
+	     value 100;
+          }
+          enum auto {
+	     value 1000;
+          }
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/ValueStatementWithNegativeValue.yang b/utils/yangutils/plugin/src/test/resources/ValueStatementWithNegativeValue.yang
new file mode 100644
index 0000000..a3f236b
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ValueStatementWithNegativeValue.yang
@@ -0,0 +1,18 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf speed {
+        type enumeration {
+          enum 10m {
+	     value -2;
+          }
+          enum 100m {
+	     value "-1";
+          }
+          enum auto {
+	     value 0;
+          }
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/ValueStatementWithQuotes.yang b/utils/yangutils/plugin/src/test/resources/ValueStatementWithQuotes.yang
new file mode 100644
index 0000000..e166ca4
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ValueStatementWithQuotes.yang
@@ -0,0 +1,18 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    leaf speed {
+        type enumeration {
+          enum 10m {
+	     value "10";
+          }
+          enum 100m {
+	     value "100";
+          }
+          enum auto {
+	     value "1000";
+          }
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/VersionDualEntry.yang b/utils/yangutils/plugin/src/test/resources/VersionDualEntry.yang
new file mode 100644
index 0000000..f8eaddd
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/VersionDualEntry.yang
@@ -0,0 +1,6 @@
+module Test {
+yang-version 1;
+namespace urn:ietf:params:xml:ns:yang:ietf-ospf;
+prefix On;
+yang-version 1;
+}
diff --git a/utils/yangutils/plugin/src/test/resources/VersionInvalidSyntax.yang b/utils/yangutils/plugin/src/test/resources/VersionInvalidSyntax.yang
new file mode 100644
index 0000000..26cb0b2
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/VersionInvalidSyntax.yang
@@ -0,0 +1,5 @@
+module Test {
+namespace urn:ietf:params:xml:ns:yang:ietf-ospf;
+prefix On;
+yang-version ;
+}
diff --git a/utils/yangutils/plugin/src/test/resources/VersionInvalidValue.yang b/utils/yangutils/plugin/src/test/resources/VersionInvalidValue.yang
new file mode 100644
index 0000000..e8e6107
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/VersionInvalidValue.yang
@@ -0,0 +1,5 @@
+module Test {
+yang-version 2;
+namespace urn:ietf:params:xml:ns:yang:ietf-ospf;
+prefix On;
+}
diff --git a/utils/yangutils/plugin/src/test/resources/VersionNotPresent.yang b/utils/yangutils/plugin/src/test/resources/VersionNotPresent.yang
new file mode 100644
index 0000000..eed9953
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/VersionNotPresent.yang
@@ -0,0 +1,4 @@
+module Test {
+namespace urn:ietf:params:xml:ns:yang:ietf-ospf;
+prefix On;
+}
diff --git a/utils/yangutils/plugin/src/test/resources/VersionOrder.yang b/utils/yangutils/plugin/src/test/resources/VersionOrder.yang
new file mode 100644
index 0000000..92463e9
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/VersionOrder.yang
@@ -0,0 +1,5 @@
+module Test {
+namespace urn:ietf:params:xml:ns:yang:ietf-ospf;
+prefix On;
+yang-version 1;
+}
diff --git a/utils/yangutils/plugin/src/test/resources/VersionValidEntry.yang b/utils/yangutils/plugin/src/test/resources/VersionValidEntry.yang
new file mode 100644
index 0000000..439ded8
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/VersionValidEntry.yang
@@ -0,0 +1,5 @@
+module Test {
+yang-version 1;
+namespace urn:ietf:params:xml:ns:yang:ietf-ospf;
+prefix On;
+}
diff --git a/utils/yangutils/plugin/src/test/resources/YangFileWithSyntaxError.yang b/utils/yangutils/plugin/src/test/resources/YangFileWithSyntaxError.yang
new file mode 100644
index 0000000..413a181
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/YangFileWithSyntaxError.yang
@@ -0,0 +1,6 @@
+module Antlrtest {
+yang-version 1
+namespace urn:ietf:params:xml:ns:yang:ietf-ospf;
+prefix Ant;
+}
+
diff --git a/utils/yangutils/plugin/src/test/resources/YangFileWithoutSyntaxError.yang b/utils/yangutils/plugin/src/test/resources/YangFileWithoutSyntaxError.yang
new file mode 100644
index 0000000..4f4839f
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/YangFileWithoutSyntaxError.yang
@@ -0,0 +1,6 @@
+module Antlrtest {
+yang-version 1;
+namespace urn:ietf:params:xml:ns:yang:ietf-ospf;
+prefix Ant;
+}
+
diff --git a/utils/yangutils/plugin/src/test/resources/file1UsesFile2TypeDefFile3Type/ietf-inet-types.yang b/utils/yangutils/plugin/src/test/resources/file1UsesFile2TypeDefFile3Type/ietf-inet-types.yang
new file mode 100644
index 0000000..db6df27
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/file1UsesFile2TypeDefFile3Type/ietf-inet-types.yang
@@ -0,0 +1,12 @@
+  module ietf-inet-types {
+
+    yang-version 1;
+
+    namespace
+      "urn:ietf:params:xml:ns:yang:ietf-inet-types";
+
+    prefix inet;
+    typedef uri {
+      type string;
+    }
+  }  
diff --git a/utils/yangutils/plugin/src/test/resources/file1UsesFile2TypeDefFile3Type/ietf-network-topology.yang b/utils/yangutils/plugin/src/test/resources/file1UsesFile2TypeDefFile3Type/ietf-network-topology.yang
new file mode 100644
index 0000000..4f426e4
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/file1UsesFile2TypeDefFile3Type/ietf-network-topology.yang
@@ -0,0 +1,34 @@
+ module ietf-network-topology {
+   yang-version 1;
+   namespace "urn:ietf:params:xml:ns:yang:ietf-network-topology";
+   prefix lnk;
+
+   import ietf-inet-types {
+     prefix inet;
+   }
+   
+   typedef tp-id {
+     type inet:uri;
+     description
+       "An identifier for termination points on a node.
+        The identifier SHOULD be chosen such that the same TP in a
+        real network topology will always be identified through the
+        same identifier, even if the model is instantiated in
+        separate datastores. An implementation MAY choose to capture
+        semantics in the identifier, for example to indicate the type
+        of TP and/or the type of node and topology that the TP is a
+        part of.";
+   }
+
+   grouping tp-ref {
+     description
+       "References a termination point in a specific node.";
+     leaf tp-ref {
+       type tp-id;
+       description
+         "A type for an absolute reference to a termination point.
+          (This type should not be used for relative references.
+          In such a case, a relative path should be used instead.)";
+     }
+   }
+ }
diff --git a/utils/yangutils/plugin/src/test/resources/file1UsesFile2TypeDefFile3Type/ietf-te-topology.yang b/utils/yangutils/plugin/src/test/resources/file1UsesFile2TypeDefFile3Type/ietf-te-topology.yang
new file mode 100644
index 0000000..c1d9324
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/file1UsesFile2TypeDefFile3Type/ietf-te-topology.yang
@@ -0,0 +1,17 @@
+   module ietf-te-topology {
+     yang-version 1;
+     namespace "urn:ietf:params:xml:ns:yang:ietf-te-topology";
+     // replace with IANA namespace when assigned
+
+     prefix "tet";
+
+     import ietf-network-topology {
+       prefix "nt";
+     }
+
+     container underlay-trail-src {
+         uses nt:tp-ref;
+         description
+           "Source TE link of the underlay trail.";
+       }
+   }
diff --git a/utils/yangutils/plugin/src/test/resources/groupingNodeSameAsModule/portpair.yang b/utils/yangutils/plugin/src/test/resources/groupingNodeSameAsModule/portpair.yang
new file mode 100644
index 0000000..3497f04
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/groupingNodeSameAsModule/portpair.yang
@@ -0,0 +1,29 @@
+module port-pair {
+
+    yang-version 1;
+
+    namespace "sfc.portpair";
+
+    prefix "port-pair";
+   
+     grouping port-pair {
+        container  port-pair {
+
+        	leaf name {
+           	    type string;
+        	}
+
+        	
+        	leaf description {
+            	    type string;
+        	}
+
+   	}
+    }
+   
+    rpc get-port-pair {
+      output {
+          uses port-pair;
+      }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/hierarchicalinterfiletype/ietf-inet-types.yang b/utils/yangutils/plugin/src/test/resources/hierarchicalinterfiletype/ietf-inet-types.yang
new file mode 100644
index 0000000..38f209f
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/hierarchicalinterfiletype/ietf-inet-types.yang
@@ -0,0 +1,15 @@
+  module ietf-inet-types {
+
+    yang-version 1;
+
+    namespace
+      "urn:ietf:params:xml:ns:yang:ietf-inet-types";
+
+    prefix inet;
+
+
+
+    typedef uri {
+      type string;
+    }
+  }
diff --git a/utils/yangutils/plugin/src/test/resources/hierarchicalinterfiletype/ietf-network-topology.yang b/utils/yangutils/plugin/src/test/resources/hierarchicalinterfiletype/ietf-network-topology.yang
new file mode 100644
index 0000000..6e9dfb7
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/hierarchicalinterfiletype/ietf-network-topology.yang
@@ -0,0 +1,17 @@
+ module ietf-network-topology {
+   yang-version 1;
+   namespace "urn:ietf:params:xml:ns:yang:ietf-network-topology";
+   prefix nt;
+
+   import ietf-inet-types {
+     prefix inet;
+   }
+   import ietf-network {
+     prefix nd;
+   }
+         leaf source-node {
+           type nd:node-id;
+           description
+             "Source node identifier, must be in same topology.";
+         }
+ }
diff --git a/utils/yangutils/plugin/src/test/resources/hierarchicalinterfiletype/ietf-network.yang b/utils/yangutils/plugin/src/test/resources/hierarchicalinterfiletype/ietf-network.yang
new file mode 100644
index 0000000..1f15b40
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/hierarchicalinterfiletype/ietf-network.yang
@@ -0,0 +1,16 @@
+   module ietf-network {
+     yang-version 1;
+     namespace "urn:ietf:params:xml:ns:yang:ietf-network";
+     prefix nd;
+
+     import ietf-inet-types {
+       prefix inet;
+     }
+
+    typedef node-id {
+       type inet:uri;
+       description
+         "Identifier for a node.";
+     }
+
+   }
diff --git a/utils/yangutils/plugin/src/test/resources/hierarchicalintrawithinterfiletype/ietf-inet-types.yang b/utils/yangutils/plugin/src/test/resources/hierarchicalintrawithinterfiletype/ietf-inet-types.yang
new file mode 100644
index 0000000..48d13c6
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/hierarchicalintrawithinterfiletype/ietf-inet-types.yang
@@ -0,0 +1,13 @@
+  module ietf-inet-types {
+
+    yang-version 1;
+
+    namespace
+      "urn:ietf:params:xml:ns:yang:ietf-inet-types";
+
+    prefix inet;
+
+    typedef uri {
+      type string;
+    }
+  }
diff --git a/utils/yangutils/plugin/src/test/resources/hierarchicalintrawithinterfiletype/ietf-network.yang b/utils/yangutils/plugin/src/test/resources/hierarchicalintrawithinterfiletype/ietf-network.yang
new file mode 100644
index 0000000..e35d0f5
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/hierarchicalintrawithinterfiletype/ietf-network.yang
@@ -0,0 +1,22 @@
+   module ietf-network {
+     yang-version 1;
+     namespace "urn:ietf:params:xml:ns:yang:ietf-network";
+     prefix nd;
+
+     import ietf-inet-types {
+       prefix inet;
+     }
+       leaf node-ref {
+         type node-id;
+         description
+           "Used to reference a node.
+            Nodes are identified relative to the network they are
+            contained in.";
+       }
+
+    typedef node-id {
+       type inet:uri;
+       description
+         "Identifier for a node.";
+     }
+   }
diff --git a/utils/yangutils/plugin/src/test/resources/ietfyang/l3vpnservice/ietf-inet-types.yang b/utils/yangutils/plugin/src/test/resources/ietfyang/l3vpnservice/ietf-inet-types.yang
new file mode 100644
index 0000000..851a4d7
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ietfyang/l3vpnservice/ietf-inet-types.yang
@@ -0,0 +1,454 @@
+  module ietf-inet-types {
+
+    yang-version 1;
+
+    namespace
+      "urn:ietf:params:xml:ns:yang:ietf-inet-types";
+
+    prefix inet;
+
+    organization
+      "IETF NETMOD (NETCONF Data Modeling Language) Working Group";
+
+    contact
+      "WG Web:   <http://tools.ietf.org/wg/netmod/>
+    WG List:  <mailto:netmod@ietf.org>
+
+    WG Chair: David Kessens
+              <mailto:david.kessens@nsn.com>
+
+    WG Chair: Juergen Schoenwaelder
+              <mailto:j.schoenwaelder@jacobs-university.de>
+
+    Editor:   Juergen Schoenwaelder
+              <mailto:j.schoenwaelder@jacobs-university.de>";
+
+    description
+      "This module contains a collection of generally useful derived
+    YANG data types for Internet addresses and related things.
+
+    Copyright (c) 2013 IETF Trust and the persons identified as
+    authors of the code.  All rights reserved.
+
+    Redistribution and use in source and binary forms, with or
+    without modification, is permitted pursuant to, and subject
+    to the license terms contained in, the Simplified BSD License
+    set forth in Section 4.c of the IETF Trust's Legal Provisions
+    Relating to IETF Documents
+    (http://trustee.ietf.org/license-info).
+
+    This version of this YANG module is part of RFC 6991; see
+    the RFC itself for full legal notices.";
+
+    revision "2013-07-15" {
+      description
+        "This revision adds the following new data types:
+      - ip-address-no-zone
+      - ipv4-address-no-zone
+      - ipv6-address-no-zone";
+      reference
+        "RFC 6991: Common YANG Data Types";
+
+    }
+
+    revision "2010-09-24" {
+      description "Initial revision.";
+      reference
+        "RFC 6021: Common YANG Data Types";
+
+    }
+
+
+    typedef ip-version {
+      type enumeration {
+        enum "unknown" {
+          value 0;
+          description
+            "An unknown or unspecified version of the Internet
+          protocol.";
+        }
+        enum "ipv4" {
+          value 1;
+          description
+            "The IPv4 protocol as defined in RFC 791.";
+        }
+        enum "ipv6" {
+          value 2;
+          description
+            "The IPv6 protocol as defined in RFC 2460.";
+        }
+      }
+      description
+        "This value represents the version of the IP protocol.
+
+      In the value set and its semantics, this type is equivalent
+      to the InetVersion textual convention of the SMIv2.";
+      reference
+        "RFC  791: Internet Protocol
+         RFC 2460: Internet Protocol, Version 6 (IPv6) Specification
+         RFC 4001: Textual Conventions for Internet Network Addresses";
+
+    }
+
+    typedef dscp {
+      type uint8 {
+        range "0..63";
+      }
+      description
+        "The dscp type represents a Differentiated Services Code Point
+      that may be used for marking packets in a traffic stream.
+      In the value set and its semantics, this type is equivalent
+      to the Dscp textual convention of the SMIv2.";
+      reference
+        "RFC 3289: Management Information Base for the Differentiated
+              Services Architecture
+         RFC 2474: Definition of the Differentiated Services Field
+              (DS Field) in the IPv4 and IPv6 Headers
+         RFC 2780: IANA Allocation Guidelines For Values In
+              the Internet Protocol and Related Headers";
+
+    }
+
+    typedef ipv6-flow-label {
+      type uint32 {
+        range "0..1048575";
+      }
+      description
+        "The ipv6-flow-label type represents the flow identifier or Flow
+      Label in an IPv6 packet header that may be used to
+      discriminate traffic flows.
+
+      In the value set and its semantics, this type is equivalent
+      to the IPv6FlowLabel textual convention of the SMIv2.";
+      reference
+        "RFC 3595: Textual Conventions for IPv6 Flow Label
+         RFC 2460: Internet Protocol, Version 6 (IPv6) Specification";
+
+    }
+
+    typedef port-number {
+      type uint16 {
+        range "0..65535";
+      }
+      description
+        "The port-number type represents a 16-bit port number of an
+      Internet transport-layer protocol such as UDP, TCP, DCCP, or
+      SCTP.  Port numbers are assigned by IANA.  A current list of
+      all assignments is available from <http://www.iana.org/>.
+
+      Note that the port number value zero is reserved by IANA.  In
+      situations where the value zero does not make sense, it can
+      be excluded by subtyping the port-number type.
+      In the value set and its semantics, this type is equivalent
+      to the InetPortNumber textual convention of the SMIv2.";
+      reference
+        "RFC  768: User Datagram Protocol
+         RFC  793: Transmission Control Protocol
+         RFC 4960: Stream Control Transmission Protocol
+         RFC 4340: Datagram Congestion Control Protocol (DCCP)
+         RFC 4001: Textual Conventions for Internet Network Addresses";
+
+    }
+
+    typedef as-number {
+      type uint32;
+      description
+        "The as-number type represents autonomous system numbers
+      which identify an Autonomous System (AS).  An AS is a set
+      of routers under a single technical administration, using
+      an interior gateway protocol and common metrics to route
+      packets within the AS, and using an exterior gateway
+      protocol to route packets to other ASes.  IANA maintains
+      the AS number space and has delegated large parts to the
+      regional registries.
+
+      Autonomous system numbers were originally limited to 16
+      bits.  BGP extensions have enlarged the autonomous system
+      number space to 32 bits.  This type therefore uses an uint32
+      base type without a range restriction in order to support
+      a larger autonomous system number space.
+
+      In the value set and its semantics, this type is equivalent
+      to the InetAutonomousSystemNumber textual convention of
+      the SMIv2.";
+      reference
+        "RFC 1930: Guidelines for creation, selection, and registration
+              of an Autonomous System (AS)
+         RFC 4271: A Border Gateway Protocol 4 (BGP-4)
+         RFC 4001: Textual Conventions for Internet Network Addresses
+         RFC 6793: BGP Support for Four-Octet Autonomous System (AS)
+              Number Space";
+
+    }
+
+    typedef ip-address {
+      type union {
+        type ipv4-address;
+        type ipv6-address;
+      }
+      description
+        "The ip-address type represents an IP address and is IP
+      version neutral.  The format of the textual representation
+      implies the IP version.  This type supports scoped addresses
+      by allowing zone identifiers in the address format.";
+      reference
+        "RFC 4007: IPv6 Scoped Address Architecture";
+
+    }
+
+    typedef ipv4-address {
+      type string {
+        pattern
+          '(([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])(%[\p{N}\p{L}]+)?';
+      }
+      description
+        "The ipv4-address type represents an IPv4 address in
+       dotted-quad notation.  The IPv4 address may include a zone
+       index, separated by a % sign.
+
+       The zone index is used to disambiguate identical address
+       values.  For link-local addresses, the zone index will
+       typically be the interface index number or the name of an
+       interface.  If the zone index is not present, the default
+       zone of the device will be used.
+
+       The canonical format for the zone index is the numerical
+       format";
+    }
+
+    typedef ipv6-address {
+      type string {
+        pattern
+          '((:|[0-9a-fA-F]{0,4}):)([0-9a-fA-F]{0,4}:){0,5}((([0-9a-fA-F]{0,4}:)?(:|[0-9a-fA-F]{0,4}))|(((25[0-5]|2[0-4][0-9]|[01]?[0-9]?[0-9])\.){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9]?[0-9])))(%[\p{N}\p{L}]+)?';
+        pattern
+          '(([^:]+:){6}(([^:]+:[^:]+)|(.*\..*)))|((([^:]+:)*[^:]+)?::(([^:]+:)*[^:]+)?)(%.+)?';
+      }
+      description
+        "The ipv6-address type represents an IPv6 address in full,
+      mixed, shortened, and shortened-mixed notation.  The IPv6
+      address may include a zone index, separated by a % sign.
+
+      The zone index is used to disambiguate identical address
+      values.  For link-local addresses, the zone index will
+      typically be the interface index number or the name of an
+      interface.  If the zone index is not present, the default
+      zone of the device will be used.
+
+
+
+      The canonical format of IPv6 addresses uses the textual
+      representation defined in Section 4 of RFC 5952.  The
+      canonical format for the zone index is the numerical
+      format as described in Section 11.2 of RFC 4007.";
+      reference
+        "RFC 4291: IP Version 6 Addressing Architecture
+         RFC 4007: IPv6 Scoped Address Architecture
+         RFC 5952: A Recommendation for IPv6 Address Text
+              Representation";
+
+    }
+
+    typedef ip-address-no-zone {
+      type union {
+        type ipv4-address-no-zone;
+        type ipv6-address-no-zone;
+      }
+      description
+        "The ip-address-no-zone type represents an IP address and is
+      IP version neutral.  The format of the textual representation
+      implies the IP version.  This type does not support scoped
+      addresses since it does not allow zone identifiers in the
+      address format.";
+      reference
+        "RFC 4007: IPv6 Scoped Address Architecture";
+
+    }
+
+    typedef ipv4-address-no-zone {
+      type ipv4-address {
+        pattern '[0-9\.]*';
+      }
+      description
+        "An IPv4 address without a zone index.  This type, derived from
+       ipv4-address, may be used in situations where the zone is
+       known from the context and hence no zone index is needed.";
+    }
+
+    typedef ipv6-address-no-zone {
+      type ipv6-address {
+        pattern '[0-9a-fA-F:\.]*';
+      }
+      description
+        "An IPv6 address without a zone index.  This type, derived from
+       ipv6-address, may be used in situations where the zone is
+       known from the context and hence no zone index is needed.";
+      reference
+        "RFC 4291: IP Version 6 Addressing Architecture
+         RFC 4007: IPv6 Scoped Address Architecture
+         RFC 5952: A Recommendation for IPv6 Address Text
+              Representation";
+
+    }
+
+    typedef ip-prefix {
+      type union {
+        type ipv4-prefix;
+        type ipv6-prefix;
+      }
+      description
+        "The ip-prefix type represents an IP prefix and is IP
+      version neutral.  The format of the textual representations
+      implies the IP version.";
+    }
+
+    typedef ipv4-prefix {
+      type string {
+        pattern
+          '(([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])/(([0-9])|([1-2][0-9])|(3[0-2]))';
+      }
+      description
+        "The ipv4-prefix type represents an IPv4 address prefix.
+      The prefix length is given by the number following the
+      slash character and must be less than or equal to 32.
+
+      A prefix length value of n corresponds to an IP address
+      mask that has n contiguous 1-bits from the most
+      significant bit (MSB) and all other bits set to 0.
+
+      The canonical format of an IPv4 prefix has all bits of
+      the IPv4 address set to zero that are not part of the
+      IPv4 prefix.";
+    }
+
+    typedef ipv6-prefix {
+      type string {
+        pattern
+          '((:|[0-9a-fA-F]{0,4}):)([0-9a-fA-F]{0,4}:){0,5}((([0-9a-fA-F]{0,4}:)?(:|[0-9a-fA-F]{0,4}))|(((25[0-5]|2[0-4][0-9]|[01]?[0-9]?[0-9])\.){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9]?[0-9])))(/(([0-9])|([0-9]{2})|(1[0-1][0-9])|(12[0-8])))';
+        pattern
+          '(([^:]+:){6}(([^:]+:[^:]+)|(.*\..*)))|((([^:]+:)*[^:]+)?::(([^:]+:)*[^:]+)?)(/.+)';
+      }
+      description
+        "The ipv6-prefix type represents an IPv6 address prefix.
+      The prefix length is given by the number following the
+      slash character and must be less than or equal to 128.
+
+      A prefix length value of n corresponds to an IP address
+      mask that has n contiguous 1-bits from the most
+      significant bit (MSB) and all other bits set to 0.
+
+      The IPv6 address should have all bits that do not belong
+      to the prefix set to zero.
+
+      The canonical format of an IPv6 prefix has all bits of
+      the IPv6 address set to zero that are not part of the
+      IPv6 prefix.  Furthermore, the IPv6 address is represented
+      as defined in Section 4 of RFC 5952.";
+      reference
+        "RFC 5952: A Recommendation for IPv6 Address Text
+              Representation";
+
+    }
+
+    typedef domain-name {
+      type string {
+        length "1..253";
+        pattern
+          '((([a-zA-Z0-9_]([a-zA-Z0-9\-_]){0,61})?[a-zA-Z0-9]\.)*([a-zA-Z0-9_]([a-zA-Z0-9\-_]){0,61})?[a-zA-Z0-9]\.?)|\.';
+      }
+      description
+        "The domain-name type represents a DNS domain name.  The
+      name SHOULD be fully qualified whenever possible.
+
+      Internet domain names are only loosely specified.  Section
+      3.5 of RFC 1034 recommends a syntax (modified in Section
+      2.1 of RFC 1123).  The pattern above is intended to allow
+      for current practice in domain name use, and some possible
+      future expansion.  It is designed to hold various types of
+      domain names, including names used for A or AAAA records
+      (host names) and other records, such as SRV records.  Note
+      that Internet host names have a stricter syntax (described
+      in RFC 952) than the DNS recommendations in RFCs 1034 and
+      1123, and that systems that want to store host names in
+      schema nodes using the domain-name type are recommended to
+      adhere to this stricter standard to ensure interoperability.
+
+      The encoding of DNS names in the DNS protocol is limited
+      to 255 characters.  Since the encoding consists of labels
+      prefixed by a length bytes and there is a trailing NULL
+      byte, only 253 characters can appear in the textual dotted
+      notation.
+
+      The description clause of schema nodes using the domain-name
+      type MUST describe when and how these names are resolved to
+      IP addresses.  Note that the resolution of a domain-name value
+      may require to query multiple DNS records (e.g., A for IPv4
+      and AAAA for IPv6).  The order of the resolution process and
+      which DNS record takes precedence can either be defined
+      explicitly or may depend on the configuration of the
+      resolver.
+
+      Domain-name values use the US-ASCII encoding.  Their canonical
+      format uses lowercase US-ASCII characters.  Internationalized
+      domain names MUST be A-labels as per RFC 5890.";
+      reference
+        "RFC  952: DoD Internet Host Table Specification
+         RFC 1034: Domain Names - Concepts and Facilities
+         RFC 1123: Requirements for Internet Hosts -- Application
+              and Support
+         RFC 2782: A DNS RR for specifying the location of services
+              (DNS SRV)
+         RFC 5890: Internationalized Domain Names in Applications
+              (IDNA): Definitions and Document Framework";
+
+    }
+
+    typedef host {
+      type union {
+        type ip-address;
+        type domain-name;
+      }
+      description
+        "The host type represents either an IP address or a DNS
+      domain name.";
+    }
+
+    typedef uri {
+      type string;
+      description
+        "The uri type represents a Uniform Resource Identifier
+      (URI) as defined by STD 66.
+
+      Objects using the uri type MUST be in US-ASCII encoding,
+      and MUST be normalized as described by RFC 3986 Sections
+      6.2.1, 6.2.2.1, and 6.2.2.2.  All unnecessary
+      percent-encoding is removed, and all case-insensitive
+      characters are set to lowercase except for hexadecimal
+      digits, which are normalized to uppercase as described in
+      Section 6.2.2.1.
+
+      The purpose of this normalization is to help provide
+      unique URIs.  Note that this normalization is not
+      sufficient to provide uniqueness.  Two URIs that are
+      textually distinct after this normalization may still be
+      equivalent.
+
+      Objects using the uri type may restrict the schemes that
+      they permit.  For example, 'data:' and 'urn:' schemes
+      might not be appropriate.
+
+      A zero-length URI is not a valid URI.  This can be used to
+      express 'URI absent' where required.
+
+      In the value set and its semantics, this type is equivalent
+      to the Uri SMIv2 textual convention defined in RFC 5017.";
+      reference
+        "RFC 3986: Uniform Resource Identifier (URI): Generic Syntax
+         RFC 3305: Report from the Joint W3C/IETF URI Planning Interest
+              Group: Uniform Resource Identifiers (URIs), URLs,
+              and Uniform Resource Names (URNs): Clarifications
+              and Recommendations
+         RFC 5017: MIB Textual Conventions for Uniform Resource
+              Identifiers (URIs)";
+
+    }
+  }  // module ietf-inet-types
diff --git a/utils/yangutils/plugin/src/test/resources/ietfyang/l3vpnservice/ietf-sd-onos-common-types.yang b/utils/yangutils/plugin/src/test/resources/ietfyang/l3vpnservice/ietf-sd-onos-common-types.yang
new file mode 100644
index 0000000..7cde2ec
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ietfyang/l3vpnservice/ietf-sd-onos-common-types.yang
@@ -0,0 +1,141 @@
+   module ietf-sd-onos-common-types {
+     namespace "urn:ietf:params:xml:ns:yang:ietf-sd-onos-common-types";
+     prefix types ;
+     /*
+     import ietf-inet-types{
+        prefix inet;
+        }
+     import ietf-yang-types {
+       prefix yang-types;
+       }
+     */
+     organization "";
+     contact "";
+
+     description
+       "Defines common basic types of L3VPN.";
+
+     revision "2015-12-16" {
+       reference "";
+     }
+
+     typedef admin-status {
+       type enumeration {
+         enum admin-up {
+           value 0 ;
+           description "admin up, the operate-status is depend on the real
+   running status ." ;
+         }
+         enum admin-down {
+           value 1 ;
+           description "admin down,the operate-status is forced to down no
+   matter what the real status is" ;
+         }
+         enum config-up {
+           value 2 ;
+           description "the operate-status is forced to up no matter what
+   the real status is." ;
+         }
+       }
+       default admin-up;
+       description
+         "The administration status of the service.";
+     }
+
+     typedef notification-status {
+       type enumeration {
+         enum up {
+           value 0 ;
+           description "up." ;
+         }
+         enum down {
+           value 1 ;
+           description "down." ;
+         }
+       }
+       default up;
+       description
+         "The notification status of the service.";
+     }
+
+     typedef notification-type {
+       type enumeration {
+         enum ne{
+           value 0 ;
+           description "ncd change." ;
+         }
+         enum link{
+           value 1 ;
+           description "link change." ;
+         }
+         enum ltp{
+           value 2 ;
+           description "ltp change." ;
+         }
+       }
+       default ltp;
+       description
+         "The notification-type of the service.";
+     }
+
+     typedef operate-status {
+       type enumeration {
+         enum operate-up {
+           value 0 ;
+           description "operate up." ;
+         }
+         enum operate-down {
+           value 1 ;
+           description "operate down." ;
+         }
+       }
+       default operate-up;
+       description
+         "The operation status of the service.";
+     }
+
+      grouping command-result {
+         description
+           "Reusable container of the result of the command.";
+        container command-result {
+           description
+             "The result of the command.";
+          leaf result {
+             type int8;
+             description
+               "1 : success, 2 : failed, 3 : partly failed" ;
+         }
+         container success-resources {
+           description
+             "The resources those are available." ;
+           list success-resource-list {
+             description
+               "The resource list shows those are available." ;
+             leaf resource-id {
+               type string;
+               description
+                 "The available resource id." ;
+             }
+           }
+         }
+         container failed-resources {
+           description
+             "The resources those are failed." ;
+           list failed-resource-list {
+             description
+               "The resources list shows those are failed." ;
+             leaf resource-id {
+               type string;
+               description
+                 "The failed resources ids." ;
+             }
+             leaf error-code {
+               type string;
+               description
+                 "The error code." ;
+             }
+           }
+         }
+       }
+     }
+   }
diff --git a/utils/yangutils/plugin/src/test/resources/ietfyang/l3vpnservice/ietf-sd-onos-service-l3vpn.yang b/utils/yangutils/plugin/src/test/resources/ietfyang/l3vpnservice/ietf-sd-onos-service-l3vpn.yang
new file mode 100644
index 0000000..7b55f71
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ietfyang/l3vpnservice/ietf-sd-onos-service-l3vpn.yang
@@ -0,0 +1,316 @@
+   module ietf-sd-onos-service-l3vpn {
+     namespace "urn:ietf:params:xml:ns:yang:ietf-sd-onos-service-l3vpn";
+     prefix l3vpn ;
+     /*
+     import ietf-inet-types{
+       prefix inet;
+     }
+     import ietf-yang-types {
+       prefix yang-types;
+     }
+     */
+     import ietf-sd-onos-service-types {
+       prefix service-types;
+     }
+     import ietf-sd-onos-common-types {
+       prefix types;
+     }
+     organization "";
+     contact "";
+
+     description
+       "L3vpn configuration model in ONOS.";
+
+     revision "2015-12-16" {
+       reference "";
+     }
+
+      grouping l3vpn {
+       description
+         "The configuration module of l3 vpn.";
+       leaf name {
+         type string ;
+         mandatory true;
+         description "name of snc eline." ;
+       }
+       leaf id {
+         type uint32 ;
+         mandatory true;
+         description "ID of snc eline." ;
+       }
+       leaf user-label {
+         type string ;
+         description "user label of snc eline." ;
+       }
+       leaf parent-ncd-id {
+         type string ;
+         description "parent ncd id." ;
+       }
+
+       leaf admin-status {
+         type types:admin-status;
+         description "administration status." ;
+       }
+       leaf operate-status {
+         type types:operate-status;
+         description "operation status." ;
+       }
+
+       uses service-type-grouping;
+       container acess-information {
+              description "access information of the l3 vpn." ;
+
+           uses service-types:l3-ac;        }
+
+       container protect-policy{
+         description "L3VPN Service protect policy." ;
+         uses service-types:protect-policy;
+       }
+       container tunnel-service {
+         description "tunnel service." ;
+         uses service-types:tunnel-service;
+       }
+
+     }
+
+     grouping service-type-grouping {
+       description "Basic service type" ;
+       leaf service-topology {
+         type enumeration {
+           enum full-mesh {
+             value 1 ;
+             description "full-mesh." ;
+           }
+           enum hub-spoke {
+             value 2 ;
+             description "hub-spoke." ;
+           }
+         }
+         default full-mesh;
+         description "service topology type." ;
+       }
+     }
+
+     container service {
+       description
+         "Root level of L3vpn service module.";
+       container l3vpn-cfg {
+         description
+           "L3vpn configuration model in ONOS.";
+         list vpn-cfg {
+           key name;
+           description
+             "vpn configuration parameter list.";
+           uses l3vpn;
+         }
+       }
+       container service-paths {
+         description
+           "The service path of the l3 vpn.";
+       }
+     }
+
+
+
+     rpc create-l3vpn-instance {
+       description "Create l3vpn instance." ;
+       input {
+         container l3vpn-instance {
+           description "Create l3vpn instance." ;
+           uses l3vpn;
+         }
+       }
+     }
+
+     rpc delete-l3vpn-instance {
+       description "Delete l3vpn instance." ;
+       input {
+         leaf l3vpn-id {
+           type string;
+           description "vpn id." ;
+         }
+       }
+     }
+
+     rpc close-l3vpn {
+     description "Close l3vpn." ;
+         input {
+             leaf l3vpn-id {
+                 type string;
+           description "vpn id." ;
+             }
+             container ac-status {
+           description "Access status of the vpn." ;
+                 list acs{
+                     key "id";
+             description "Access information." ;
+                     leaf id {
+                         type string;
+               description "Access id." ;
+                     }
+                     leaf admin-status {
+                         type types:admin-status;
+               description "Administration status." ;
+                     }
+                 }
+             }
+         }
+     }
+
+     rpc modify-l3vpn-instance-basic {
+       description "Modify l3vpn instance basic information." ;
+       input {
+         leaf l3vpn-id {
+           type string;
+           description "vpn id." ;
+         }
+         leaf user-label {
+           type string ;
+           description "user label." ;
+         }
+       }
+     }
+
+     rpc modify-l3vpn-instance-ac-qos {
+       description "Modify l3vpn instance ac qos information." ;
+       input {
+         leaf l3vpn-id {
+           type string;
+           description "L3vpn ID." ;
+         }
+         container ac-qos {
+           description "ac qos information." ;
+           list acs{
+           key "id";
+           description "acs list." ;
+                 leaf id {
+                   type string;
+                   description "acs ID." ;
+               }
+               container qos-policy {
+             description "qos policy." ;
+                   container qos-if-cars {
+               description "cars qos policy." ;
+                          uses service-types:qos-if-car;
+
+                   }
+               }
+           }
+         }
+       }
+     }
+     rpc modify-l3vpn-instance-connection {
+       description "Modify a l3vpn connection." ;
+       input {
+         leaf l3vpn-id {
+           type string;
+           description "L3vpn ID." ;
+         }
+         container ac-connection {
+           description "ac connection." ;
+           list acs{
+             key "id";
+             description "acs ID." ;
+             leaf id {
+               type string ;
+               description "acs ID." ;
+             }
+             container connection {
+               description "CE to PE  connection." ;
+               uses service-types:connection;
+             }
+           }
+         }
+       }
+     }
+     rpc inquire-l3vpn-instance-work-path {
+       description "Inquire a L3VPN instance work path." ;
+        input {
+              leaf service-id {
+                type string;
+             description "service ID." ;
+              }
+               leaf ingress-ne-id {
+                 type string ;
+              description "ingress network element ID." ;
+               }
+               leaf destination-ne-id {
+                 type string ;
+              description "destination network element ID." ;
+               }
+               leaf ingress-ac-id {
+                 type string ;
+              description "ingress ac ID." ;
+               }
+               leaf destination-ac-id {
+                 type string ;
+              description "destination ac ID." ;
+               }
+               leaf path-layer {
+                  type string ;
+               description "path layer." ;
+               }
+               leaf path-role {
+                  type string ;
+             description "path role." ;
+               }
+       }
+       output {
+           container service-path {
+            description "service path." ;
+              leaf service-id {
+                type string;
+             description "service ID." ;
+              }
+               leaf ingress-ne-id {
+                 type string ;
+              description "ingress network element ID." ;
+               }
+               leaf destination-ne-id {
+                 type string ;
+               description "destination network element ID." ;
+               }
+               leaf ingress-ac-id {
+                 type string ;
+              description "ingress access circuit ID." ;
+               }
+               leaf destination-ac-id {
+                 type string ;
+              description "destination access circuit ID." ;
+               }
+               leaf path-layer {
+                  type string ;
+               description "path layer." ;
+               }
+               leaf path-role {
+                  type string ;
+               description "path role." ;
+               }
+               list path-list {
+                   key "ne-id";
+             description "path list." ;
+                   leaf ne-id {
+                      type string;
+              description "network element ID." ;
+                   }
+                   leaf ingress-ltp-id {
+                      type string;
+              description "LTP ID." ;
+                   }
+                   leaf backward-peer-id {
+                      type string;
+              description "backward peer ID." ;
+                   }
+                   leaf egress-ltp-id {
+                      type string;
+              description "egress ltp ID." ;
+                   }
+                   leaf forward-peer-id {
+                      type string;
+              description "forward peer ID." ;
+                   }
+               }
+             }
+       }
+     }
+   }
diff --git a/utils/yangutils/plugin/src/test/resources/ietfyang/l3vpnservice/ietf-sd-onos-service-types.yang b/utils/yangutils/plugin/src/test/resources/ietfyang/l3vpnservice/ietf-sd-onos-service-types.yang
new file mode 100644
index 0000000..7fd7700
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/ietfyang/l3vpnservice/ietf-sd-onos-service-types.yang
@@ -0,0 +1,816 @@
+   module ietf-sd-onos-service-types {
+       namespace "urn:ietf:params:xml:ns:yang:ietf-sd-onos-service-types";
+       prefix service-types ;
+
+       import ietf-inet-types {prefix inet; }
+       import ietf-sd-onos-common-types {prefix  types;}
+
+     organization "";
+     contact "";
+
+     description
+       "Defines basic service types for L3VPN service.";
+
+     revision "2015-12-16" {
+       reference "";
+     }
+
+       typedef exp {
+           type enumeration {
+               enum BE {
+                   value 0 ;
+                   description "BE." ;
+               }
+               enum AF1 {
+                   value 1 ;
+                   description "AF1." ;
+               }
+               enum AF2 {
+                   value 2 ;
+                   description "AF2." ;
+               }
+               enum AF3 {
+                   value 3 ;
+                   description "AF3." ;
+               }
+               enum AF4 {
+                   value 4 ;
+                   description "AF4." ;
+               }
+               enum EF {
+                   value 5 ;
+                   description "EF." ;
+               }
+               enum CS6 {
+                   value 6 ;
+                   description "CS6." ;
+               }
+               enum CS7 {
+                   value 7 ;
+                   description "CS7." ;
+               }
+           }
+           default CS7;
+           description
+             "exp parameter.";
+       }
+
+       typedef pw-role{
+           type enumeration {
+               enum normal{
+                   value 0 ;
+                   description "normal." ;
+               }
+               enum master {
+                   value 1 ;
+                   description "master." ;
+               }
+               enum slave {
+                   value 2 ;
+                   description "slave." ;
+               }
+               enum DNI-PW {
+                   value 3 ;
+                   description "DNI PW." ;
+               }
+           }
+           default normal;
+           description
+             "The role of the PW.";
+       }
+
+       grouping qos-if-car {
+           description "qos parameter." ;
+         list qos-if-car {
+       key "direction";
+           description "cars qos policy." ;
+           leaf direction {
+               type enumeration {
+                   enum inbound{
+                       value 0 ;
+                       description "inbound." ;
+                   }
+                   enum outbound {
+                       value 1 ;
+                       description "outbound." ;
+                   }
+               }
+        description "qos for interface car" ;
+           }
+
+           leaf cir {
+               type int32;
+          description "forward CIR. unit:Kbps" ;
+           }
+           leaf pir {
+               type int32;
+          description "forward PIR. unit:Kbps" ;
+           }
+           leaf cbs {
+               type int32;
+          description "forward CBS. unit:Kbps" ;
+           }
+           leaf pbs {
+               type int32;
+          description "forward PBS. unit:Kbps" ;
+           }
+        }
+       }
+
+       grouping protect-policy {
+           description "The protect policy of the VPN" ;
+           leaf protect-type {
+               type enumeration {
+                   enum unprotected {
+                       value 0 ;
+                       description "unprotected." ;
+                   }
+                   enum protected {
+                       value 1 ;
+                       description "protection." ;
+                   }
+               }
+               default unprotected ;
+          description "protection type" ;
+           }
+
+           leaf revertive-type {
+               type enumeration {
+                   enum no-revertive {
+                       value 0 ;
+                       description "unprotected." ;
+                   }
+                   enum revertive {
+                       value 1 ;
+                       description "protection." ;
+                   }
+               }
+          description "revertive mode" ;
+           }
+           leaf wtr {
+               type uint32;
+               default 300;
+          description "WTR.unit:s" ;
+           }
+       }
+       grouping oam-policy {
+         description "The oam policy of the vpn service." ;
+           leaf detect-type {
+               type enumeration {
+                   enum undetect {
+                       value 0 ;
+                       description "unprotected." ;
+                   }
+                   enum APS {
+                       value 1 ;
+                       description "protection." ;
+                   }
+                   enum BFD {
+                       value 2 ;
+                       description "unprotected." ;
+                   }
+               }
+          description "detect type" ;
+           }
+           container bfd-detect-para {
+          description "bfd detect parameters." ;
+               leaf ingress-discriminator {
+                   type int32;
+            description "ingress-discriminator" ;
+               }
+               leaf egress-discriminator {
+                   type int32;
+            description "egress-discriminator" ;
+               }
+               leaf tx-interval {
+                   type int32;
+            description "tx-interval" ;
+               }
+               leaf rx-interval {
+                   type int32;
+            description "rx-interval" ;
+               }
+               leaf detect-interval {
+                   type int32;
+            description "detect-interval" ;
+              }
+           }
+       }
+       grouping ac {
+        description "Access information." ;
+           leaf id{
+               type string;
+          mandatory true;
+          description "ac id." ;
+           }
+           leaf name{
+               type string;
+          config false;
+          description "ac name." ;
+           }
+
+           leaf ne-id {
+               type string ;
+            mandatory true;
+            description "ne id." ;
+           }
+
+           leaf ltp-id {
+               type string ;
+               mandatory true;
+               description "ltp id." ;
+           }
+           leaf admin-status {
+                                     type types:admin-status;
+               description "Administration status." ;
+           }
+           leaf operate-status {
+              type types:operate-status;
+              description "Operation status." ;
+           }
+           container l2-access {
+               description "link layer access information of ac." ;
+               uses l2-access;
+           }
+
+           leaf role {
+               type enumeration {
+                   enum master {
+                       value 0 ;
+                       description "master." ;
+                   }
+                   enum slave {
+                       value 1 ;
+                       description "slave." ;
+                   }
+                   enum hub {
+                       value 2 ;
+                       description "slave." ;
+                   }
+                   enum spoke {
+                       value 3 ;
+                       description "slave." ;
+                   }
+               }
+               default master;
+          description "role of snc lsp." ;
+           }
+           container qos-policy {
+          description "The qos policy of the vpn service." ;
+               container qos-if-cars {
+             description "qos policy if car." ;
+                   list qos-if-car {
+                     //key "direction";
+                     uses qos-if-car;
+             description "List of qos parameters." ;
+                   }
+               }
+           }
+       }
+       grouping l3-ac {
+        description "Access information of l3vpn." ;
+       list access-circuit {
+           key "id";
+           description "list of access circuit." ;
+           uses ac;
+           container connection {
+               description "connection information of ac." ;
+               uses connection;
+           }
+        }
+       }
+       grouping l2-access {
+        description "Access information of l2vpn." ;
+           leaf access-type{
+               type enumeration {
+                   enum Port {
+                       value 0 ;
+                       description "master." ;
+                   }
+                   enum Dot1Q {
+                       value 1 ;
+                       description "slave." ;
+                   }
+                   enum QinQ {
+                       value 2 ;
+                       description "master." ;
+                   }
+               }
+        mandatory true;
+        description "The access type of the vpn service." ;
+           }
+           leaf dot1q-vlan-bitmap {
+               type string;
+          mandatory true;
+               description "Dot1Q Vlan Bitmap." ;
+           }
+
+           leaf qinq-svlan-bitmap {
+               type string;
+          mandatory true;
+               description "QinQ svlan Bitmap." ;
+           }
+
+           leaf qinq-cvlan-bitmap {
+               type string;
+          mandatory true;
+               description "QinQ cvlan Bitmap." ;
+           }
+           leaf access-action {
+               type enumeration {
+                   enum Keep {
+                       value 0 ;
+                       description "keep." ;
+                   }
+                   enum Push {
+                       value 1 ;
+                       description "push." ;
+                   }
+                   enum Pop {
+                       value 2 ;
+                       description "pop." ;
+                   }
+                   enum Swap {
+                       value 3 ;
+                       description "swap." ;
+                   }
+               }
+          mandatory true;
+               description "access type." ;
+           }
+
+           leaf action-vlan-id {
+               type int32 {
+                   range "1..4094";
+               }
+          description "action vlan id." ;
+           }
+       }
+       grouping connection {
+           description "Describe the connection of the vpn service." ;
+           leaf ip-address {
+               type inet:ip-address ;
+          description "ip address of access circuit's connection." ;
+           }
+           leaf mask-length {
+               type int32 {
+                   range "1..32";
+               }
+          description "mask length of ip address." ;
+           }
+           leaf protocols {
+               type enumeration {
+                   enum static {
+                       value 0 ;
+                       description "static." ;
+                   }
+                   enum ospf {
+                       value 1 ;
+                       description "ospf." ;
+                   }
+                   enum isis {
+                       value 2 ;
+                       description "bgp" ;
+                   }
+                   enum bgp {
+                       value 3 ;
+                       description "bgp" ;
+                   }
+               }
+        description "protocols between PE and CE." ;
+           }
+           container static-routes {
+          description "Defines the static routes." ;
+               list static-route {
+              key "ip-prefix mask-length";
+              description "List of static route." ;
+                   leaf ip-prefix {
+                       type inet:ipv4-address;
+               description "ip prefix" ;
+                   }
+                   leaf mask-length {
+                       type uint32 {
+                            range "1..32";
+                       }
+              description "mast length" ;
+                   }
+                   leaf next-hop {
+                       type inet:ipv4-address ;
+               description "next hop" ;
+                   }
+                   leaf preference {
+                       type uint32 {
+                           range "1..65535";
+                       }
+              description "preference of the route." ;
+                   }
+               }
+           }
+       }
+
+       grouping pw{
+           description "PW definition ";
+           leaf id {
+               type string ;
+          description "ID of pw." ;
+           }
+           uses encaplate-type-grouping;
+
+           leaf ingress-ne-id {
+               type string ;
+          description "ingress ne id." ;
+           }
+
+           leaf egress-ne-id {
+               type string ;
+          description "egress ne id." ;
+           }
+
+           leaf ctrl-word-support {
+               type enumeration {
+                   enum not-support {
+                       value 0 ;
+                       description "pw doesn't support control word" ;
+                   }
+                   enum support {
+                       value 1 ;
+                       description "pw supports control word" ;
+                   }
+               }
+               default support;
+          description "ctrl word support. 0 : not support, 1 : support" ;
+           }
+
+           leaf sn-support {
+               type enumeration {
+                   enum not-support {
+                       value 0 ;
+                       description "pw doesn't support control word" ;
+                   }
+                   enum support {
+                       value 1 ;
+                       description "pw supports control word" ;
+                   }
+               }
+               default not-support;
+          description "serial number support. 0 : not support, 1 : support" ;
+           }
+
+           leaf vccv-type {
+               type enumeration {
+                   enum not-support {
+                       value 0 ;
+                       description "pw doesn't support vccv" ;
+                   }
+                   enum CWD {
+                       value 1 ;
+                       description "pw supports vccv" ;
+                   }
+                   enum Label-alert {
+                       value 2 ;
+                       description "pw supports vccv" ;
+                   }
+                   enum TTL {
+                       value 3 ;
+                       description "pw supports vccv" ;
+                   }
+                   enum CWD&Label-alert {
+                       value 4 ;
+                       description "pw supports vccv" ;
+                   }
+                   enum CWD&TTL {
+                       value 5 ;
+                       description "pw supports vccv" ;
+                   }
+                   enum Label-alert&TTL {
+                       value 6 ;
+                       description "pw supports vccv" ;
+                   }
+                   enum CWD&Label-alert&TTL {
+                       value 7 ;
+                       description "pw supports vccv" ;
+                   }
+               }
+               default not-support;
+               description "vccv type" ;
+           }
+
+           leaf conn-ack-type {
+               type enumeration {
+                   enum not-support {
+                       value 0 ;
+                       description "pw doesn't support connection ack" ;
+                   }
+                   enum support {
+                       value 1 ;
+                       description "pw supports connection ack" ;
+                   }
+               }
+               default not-support;
+               description "Connectivity test type" ;
+           }
+           container tunnels {
+               description "Define tunnels." ;
+               list tunnel{
+                   key "tunnel-id";
+                   description "The list of tunnel id." ;
+                   uses tunnel;
+               }
+           }
+       }
+       grouping tunnel {
+           description "Reusable entity of tunnel." ;
+           leaf tunnel-id {
+               type string ;
+               description "ID of tunnel." ;
+           }
+       }
+       grouping encaplate-type-grouping {
+           description "encaplate type" ;
+           leaf encaplate-type {
+               type enumeration {
+                   enum NONE {
+                       value 0 ;
+                       description "none." ;
+                   }
+                   enum fr-dlci-martini {
+                       value 1 ;
+                       description "fr-dlci-martini." ;
+                   }
+                   enum atm-aal5-sdu {
+                       value 2 ;
+                       description "atm-aal5-sdu." ;
+                   }
+                   enum atm-transparent {
+                       value 3 ;
+                       description "atm-transparent." ;
+                   }
+                   enum ethernet-vlan {
+                       value 4 ;
+                       description "ethernet-vlan." ;
+                   }
+                   enum ethernet  {
+                       value 5 ;
+                       description "ethernet ." ;
+                   }
+                   enum  hdlc {
+                       value 6 ;
+                       description " hdlc." ;
+                   }
+                   enum ppp {
+                       value 7 ;
+                       description "ppp." ;
+                   }
+                   enum cep-mpls {
+                       value 8 ;
+                       description " cep-mpls." ;
+                   }
+                   enum atm-ntol {
+                       value 9 ;
+                       description "atm-ntol." ;
+                   }
+                   enum atm-nto1-vpc {
+                       value 10 ;
+                       description "atm-nto1-vpc." ;
+                   }
+                   enum ip-layer2 {
+                       value 11 ;
+                       description " ip-layer2." ;
+                   }
+                   enum atm-1to1-vcc {
+                       value 12 ;
+                       description "atm-1to1-vcc." ;
+                   }
+                   enum atm-1to1-vpc {
+                       value 13 ;
+                       description "atm-1to1-vpc." ;
+                   }
+                   enum atm-aal5-pdu {
+                       value 14 ;
+                       description "atm-aal5-pdu." ;
+                   }
+                   enum fr-port {
+                       value 15 ;
+                       description "fr-port." ;
+                   }
+                   enum cep-packet {
+                       value 16 ;
+                       description "cep-packet." ;
+                   }
+                   enum e1 {
+                       value 17 ;
+                       description "e1." ;
+                   }
+                    enum t1 {
+                       value 18 ;
+                       description "t1." ;
+                   }
+                   enum e3 {
+                       value 19 ;
+                       description "e3." ;
+                   }
+                   enum t3 {
+                       value 20 ;
+                       description " t3." ;
+                   }
+                   enum cesopsn-basic {
+                       value 21 ;
+                       description "cesopsn-basic." ;
+                   }
+                   enum tdmoip-aal1 {
+                       value 22 ;
+                       description "tdmoip-aal1." ;
+                   }
+                   enum cesopsn-tdm {
+                       value 23 ;
+                       description "cesopsn-tdm." ;
+                   }
+                   enum tdmoip-aal2 {
+                       value 24 ;
+                       description "tdmoip-aal2." ;
+                   }
+                   enum fr-dlci {
+                       value 25 ;
+                       description "fr-dlci." ;
+                   }
+               }
+          description "encaplate type." ;
+           }
+       }
+
+       grouping pw-trail{
+       description "pw trail information." ;
+           leaf id {
+               type string ;
+          description "ID of pw-trail." ;
+           }
+
+           leaf role {
+               type pw-role;
+          description "role of pw-trail." ;
+            }
+           container pw-lists {
+          description "List of pw information." ;
+               list pw-list {
+                    key id;
+             description "List of pw information." ;
+                    uses pw ;
+               }
+           }
+       }
+       grouping tunnel-service {
+           description "Reusable entity of tunnel service." ;
+           leaf signaling-type {
+               type enumeration {
+                   enum RSVP-TE {
+                       value 0 ;
+                       description "RSVP-TE" ;
+                   }
+                   enum LDP {
+                       value 1 ;
+                       description "LDP" ;
+                   }
+                   enum GRE {
+                       value 2 ;
+                       description "GRE" ;
+                   }
+                   enum SR-BE {
+                       value 3 ;
+                       description "SR-BE" ;
+                   }
+                   enum SR-TE {
+                       value 4 ;
+                       description "SR-TE" ;
+                   }
+               }
+               default RSVP-TE;
+          description "signaling type." ;
+           }
+           leaf tunnel-mode {
+               type enumeration {
+                   enum Nto1 {
+                       value 0 ;
+                       description "multi service one tunnel" ;
+                   }
+                   enum 1to1 {
+                       value 1 ;
+                       description "oner service one tunnel" ;
+                   }
+               }
+               default Nto1;
+          description "service to tunnel mode." ;
+           }
+           container protect-policy {
+          description "Protect policy." ;
+               uses protect-policy;
+           }
+           container oam-policy {
+          description "oam policy." ;
+               uses oam-policy;
+           }
+           leaf latency {
+               type int32;
+          description "tunnel latency requirement." ;
+           }
+       }
+       grouping service-path {
+           description "Service path of l3vpn." ;
+         list service-path{
+          key "service-id source-ne-id source-ac-id destination-ne-id destination-ac-id";
+        description
+         "The list of service path.";
+           leaf service-id {
+               type string ;
+          description "l2vpn or l3vpn service id." ;
+           }
+           leaf source-ne-id {
+               type string ;
+          description "source ne id." ;
+           }
+
+           leaf source-ac-id {
+               type string ;
+          description "source ltp id." ;
+           }
+           leaf destination-ne-id {
+               type string ;
+          description "destination ne id." ;
+           }
+
+           leaf destination-ac-id {
+               type string ;
+          description "destination ltp id." ;
+           }
+           container path-lists{
+          description "The path list of service path." ;
+               list path-list {
+                   key "path-layer path-role";
+               description "The path list of service path." ;
+                   leaf path-layer {
+                       type enumeration {
+                           enum PW {
+                               value 0 ;
+                               description "pw path." ;
+                           }
+                           enum BGP-LSP {
+                               value 1 ;
+                               description "BGP-LSP Path." ;
+                           }
+                           enum LSP {
+                               value 2 ;
+                               description "LSP Path." ;
+                           }
+                       }
+               description "path type. 0 : PW, 1 : BGP-LSP, 2 : PW" ;
+                   }
+                   leaf path-role {
+                       type enumeration {
+                           enum Primary {
+                               value 0 ;
+                               description "master path." ;
+                           }
+                           enum Backup {
+                               value 1 ;
+                               description "backup path." ;
+                           }
+                           enum Active {
+                               value 2 ;
+                               description "active path." ;
+                           }
+                       }
+                description "path role.. 0 : master, 1 : backup, 2 :
+   Bypass." ;
+                   }
+                   container paths {
+               description "path definition." ;
+                       list path {
+                           key "ne-id";
+                   description "Network element id list." ;
+                           leaf ne-id {
+                              type string;
+                   description "Network element id." ;
+                           }
+                           leaf ingress-ltp-id {
+                              type string;
+                   description "ingress ltd id." ;
+                           }
+                           leaf backward-peer-id {
+                              type string;
+                   description "backward peer id." ;
+                           }
+                           leaf egress-ltp-id {
+                              type string;
+                   description "egress ltd id." ;
+                           }
+                           leaf forward-peer-id {
+                              type string;
+                   description "forward peer id." ;
+                           }
+                       }
+                   }
+               }
+           }
+
+       }
+     }
+   }
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diff --git a/utils/yangutils/plugin/src/test/resources/interfileietf/ietf-inet-types.yang b/utils/yangutils/plugin/src/test/resources/interfileietf/ietf-inet-types.yang
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+++ b/utils/yangutils/plugin/src/test/resources/interfileietf/ietf-inet-types.yang
@@ -0,0 +1,454 @@
+  module ietf-inet-types {
+
+    yang-version 1;
+
+    namespace
+      "urn:ietf:params:xml:ns:yang:ietf-inet-types";
+
+    prefix inet;
+
+    organization
+      "IETF NETMOD (NETCONF Data Modeling Language) Working Group";
+
+    contact
+      "WG Web:   <http://tools.ietf.org/wg/netmod/>
+    WG List:  <mailto:netmod@ietf.org>
+
+    WG Chair: David Kessens
+              <mailto:david.kessens@nsn.com>
+
+    WG Chair: Juergen Schoenwaelder
+              <mailto:j.schoenwaelder@jacobs-university.de>
+
+    Editor:   Juergen Schoenwaelder
+              <mailto:j.schoenwaelder@jacobs-university.de>";
+
+    description
+      "This module contains a collection of generally useful derived
+    YANG data types for Internet addresses and related things.
+
+    Copyright (c) 2013 IETF Trust and the persons identified as
+    authors of the code.  All rights reserved.
+
+    Redistribution and use in source and binary forms, with or
+    without modification, is permitted pursuant to, and subject
+    to the license terms contained in, the Simplified BSD License
+    set forth in Section 4.c of the IETF Trust's Legal Provisions
+    Relating to IETF Documents
+    (http://trustee.ietf.org/license-info).
+
+    This version of this YANG module is part of RFC 6991; see
+    the RFC itself for full legal notices.";
+
+    revision "2013-07-15" {
+      description
+        "This revision adds the following new data types:
+      - ip-address-no-zone
+      - ipv4-address-no-zone
+      - ipv6-address-no-zone";
+      reference
+        "RFC 6991: Common YANG Data Types";
+
+    }
+
+    revision "2010-09-24" {
+      description "Initial revision.";
+      reference
+        "RFC 6021: Common YANG Data Types";
+
+    }
+
+
+    typedef ip-version {
+      type enumeration {
+        enum "unknown" {
+          value 0;
+          description
+            "An unknown or unspecified version of the Internet
+          protocol.";
+        }
+        enum "ipv4" {
+          value 1;
+          description
+            "The IPv4 protocol as defined in RFC 791.";
+        }
+        enum "ipv6" {
+          value 2;
+          description
+            "The IPv6 protocol as defined in RFC 2460.";
+        }
+      }
+      description
+        "This value represents the version of the IP protocol.
+
+      In the value set and its semantics, this type is equivalent
+      to the InetVersion textual convention of the SMIv2.";
+      reference
+        "RFC  791: Internet Protocol
+         RFC 2460: Internet Protocol, Version 6 (IPv6) Specification
+         RFC 4001: Textual Conventions for Internet Network Addresses";
+
+    }
+
+    typedef dscp {
+      type uint8 {
+        range "0..63";
+      }
+      description
+        "The dscp type represents a Differentiated Services Code Point
+      that may be used for marking packets in a traffic stream.
+      In the value set and its semantics, this type is equivalent
+      to the Dscp textual convention of the SMIv2.";
+      reference
+        "RFC 3289: Management Information Base for the Differentiated
+        	  Services Architecture
+         RFC 2474: Definition of the Differentiated Services Field
+        	  (DS Field) in the IPv4 and IPv6 Headers
+         RFC 2780: IANA Allocation Guidelines For Values In
+        	  the Internet Protocol and Related Headers";
+
+    }
+
+    typedef ipv6-flow-label {
+      type uint32 {
+        range "0..1048575";
+      }
+      description
+        "The ipv6-flow-label type represents the flow identifier or Flow
+      Label in an IPv6 packet header that may be used to
+      discriminate traffic flows.
+
+      In the value set and its semantics, this type is equivalent
+      to the IPv6FlowLabel textual convention of the SMIv2.";
+      reference
+        "RFC 3595: Textual Conventions for IPv6 Flow Label
+         RFC 2460: Internet Protocol, Version 6 (IPv6) Specification";
+
+    }
+
+    typedef port-number {
+      type uint16 {
+        range "0..65535";
+      }
+      description
+        "The port-number type represents a 16-bit port number of an
+      Internet transport-layer protocol such as UDP, TCP, DCCP, or
+      SCTP.  Port numbers are assigned by IANA.  A current list of
+      all assignments is available from <http://www.iana.org/>.
+
+      Note that the port number value zero is reserved by IANA.  In
+      situations where the value zero does not make sense, it can
+      be excluded by subtyping the port-number type.
+      In the value set and its semantics, this type is equivalent
+      to the InetPortNumber textual convention of the SMIv2.";
+      reference
+        "RFC  768: User Datagram Protocol
+         RFC  793: Transmission Control Protocol
+         RFC 4960: Stream Control Transmission Protocol
+         RFC 4340: Datagram Congestion Control Protocol (DCCP)
+         RFC 4001: Textual Conventions for Internet Network Addresses";
+
+    }
+
+    typedef as-number {
+      type uint32;
+      description
+        "The as-number type represents autonomous system numbers
+      which identify an Autonomous System (AS).  An AS is a set
+      of routers under a single technical administration, using
+      an interior gateway protocol and common metrics to route
+      packets within the AS, and using an exterior gateway
+      protocol to route packets to other ASes.  IANA maintains
+      the AS number space and has delegated large parts to the
+      regional registries.
+
+      Autonomous system numbers were originally limited to 16
+      bits.  BGP extensions have enlarged the autonomous system
+      number space to 32 bits.  This type therefore uses an uint32
+      base type without a range restriction in order to support
+      a larger autonomous system number space.
+
+      In the value set and its semantics, this type is equivalent
+      to the InetAutonomousSystemNumber textual convention of
+      the SMIv2.";
+      reference
+        "RFC 1930: Guidelines for creation, selection, and registration
+        	  of an Autonomous System (AS)
+         RFC 4271: A Border Gateway Protocol 4 (BGP-4)
+         RFC 4001: Textual Conventions for Internet Network Addresses
+         RFC 6793: BGP Support for Four-Octet Autonomous System (AS)
+        	  Number Space";
+
+    }
+
+    typedef ip-address {
+      type union {
+        type ipv4-address;
+        type ipv6-address;
+      }
+      description
+        "The ip-address type represents an IP address and is IP
+      version neutral.  The format of the textual representation
+      implies the IP version.  This type supports scoped addresses
+      by allowing zone identifiers in the address format.";
+      reference
+        "RFC 4007: IPv6 Scoped Address Architecture";
+
+    }
+
+    typedef ipv4-address {
+      type string {
+        pattern
+          '(([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])(%[\p{N}\p{L}]+)?';
+      }
+      description
+        "The ipv4-address type represents an IPv4 address in
+       dotted-quad notation.  The IPv4 address may include a zone
+       index, separated by a % sign.
+
+       The zone index is used to disambiguate identical address
+       values.  For link-local addresses, the zone index will
+       typically be the interface index number or the name of an
+       interface.  If the zone index is not present, the default
+       zone of the device will be used.
+
+       The canonical format for the zone index is the numerical
+       format";
+    }
+
+    typedef ipv6-address {
+      type string {
+        pattern
+          '((:|[0-9a-fA-F]{0,4}):)([0-9a-fA-F]{0,4}:){0,5}((([0-9a-fA-F]{0,4}:)?(:|[0-9a-fA-F]{0,4}))|(((25[0-5]|2[0-4][0-9]|[01]?[0-9]?[0-9])\.){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9]?[0-9])))(%[\p{N}\p{L}]+)?';
+        pattern
+          '(([^:]+:){6}(([^:]+:[^:]+)|(.*\..*)))|((([^:]+:)*[^:]+)?::(([^:]+:)*[^:]+)?)(%.+)?';
+      }
+      description
+        "The ipv6-address type represents an IPv6 address in full,
+      mixed, shortened, and shortened-mixed notation.  The IPv6
+      address may include a zone index, separated by a % sign.
+
+      The zone index is used to disambiguate identical address
+      values.  For link-local addresses, the zone index will
+      typically be the interface index number or the name of an
+      interface.  If the zone index is not present, the default
+      zone of the device will be used.
+
+
+
+      The canonical format of IPv6 addresses uses the textual
+      representation defined in Section 4 of RFC 5952.  The
+      canonical format for the zone index is the numerical
+      format as described in Section 11.2 of RFC 4007.";
+      reference
+        "RFC 4291: IP Version 6 Addressing Architecture
+         RFC 4007: IPv6 Scoped Address Architecture
+         RFC 5952: A Recommendation for IPv6 Address Text
+        	  Representation";
+
+    }
+
+    typedef ip-address-no-zone {
+      type union {
+        type ipv4-address-no-zone;
+        type ipv6-address-no-zone;
+      }
+      description
+        "The ip-address-no-zone type represents an IP address and is
+      IP version neutral.  The format of the textual representation
+      implies the IP version.  This type does not support scoped
+      addresses since it does not allow zone identifiers in the
+      address format.";
+      reference
+        "RFC 4007: IPv6 Scoped Address Architecture";
+
+    }
+
+    typedef ipv4-address-no-zone {
+      type ipv4-address {
+        pattern '[0-9\.]*';
+      }
+      description
+        "An IPv4 address without a zone index.  This type, derived from
+       ipv4-address, may be used in situations where the zone is
+       known from the context and hence no zone index is needed.";
+    }
+
+    typedef ipv6-address-no-zone {
+      type ipv6-address {
+        pattern '[0-9a-fA-F:\.]*';
+      }
+      description
+        "An IPv6 address without a zone index.  This type, derived from
+       ipv6-address, may be used in situations where the zone is
+       known from the context and hence no zone index is needed.";
+      reference
+        "RFC 4291: IP Version 6 Addressing Architecture
+         RFC 4007: IPv6 Scoped Address Architecture
+         RFC 5952: A Recommendation for IPv6 Address Text
+        	  Representation";
+
+    }
+
+    typedef ip-prefix {
+      type union {
+        type ipv4-prefix;
+        type ipv6-prefix;
+      }
+      description
+        "The ip-prefix type represents an IP prefix and is IP
+      version neutral.  The format of the textual representations
+      implies the IP version.";
+    }
+
+    typedef ipv4-prefix {
+      type string {
+        pattern
+          '(([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])/(([0-9])|([1-2][0-9])|(3[0-2]))';
+      }
+      description
+        "The ipv4-prefix type represents an IPv4 address prefix.
+      The prefix length is given by the number following the
+      slash character and must be less than or equal to 32.
+
+      A prefix length value of n corresponds to an IP address
+      mask that has n contiguous 1-bits from the most
+      significant bit (MSB) and all other bits set to 0.
+
+      The canonical format of an IPv4 prefix has all bits of
+      the IPv4 address set to zero that are not part of the
+      IPv4 prefix.";
+    }
+
+    typedef ipv6-prefix {
+      type string {
+        pattern
+          '((:|[0-9a-fA-F]{0,4}):)([0-9a-fA-F]{0,4}:){0,5}((([0-9a-fA-F]{0,4}:)?(:|[0-9a-fA-F]{0,4}))|(((25[0-5]|2[0-4][0-9]|[01]?[0-9]?[0-9])\.){3}(25[0-5]|2[0-4][0-9]|[01]?[0-9]?[0-9])))(/(([0-9])|([0-9]{2})|(1[0-1][0-9])|(12[0-8])))';
+        pattern
+          '(([^:]+:){6}(([^:]+:[^:]+)|(.*\..*)))|((([^:]+:)*[^:]+)?::(([^:]+:)*[^:]+)?)(/.+)';
+      }
+      description
+        "The ipv6-prefix type represents an IPv6 address prefix.
+      The prefix length is given by the number following the
+      slash character and must be less than or equal to 128.
+
+      A prefix length value of n corresponds to an IP address
+      mask that has n contiguous 1-bits from the most
+      significant bit (MSB) and all other bits set to 0.
+
+      The IPv6 address should have all bits that do not belong
+      to the prefix set to zero.
+
+      The canonical format of an IPv6 prefix has all bits of
+      the IPv6 address set to zero that are not part of the
+      IPv6 prefix.  Furthermore, the IPv6 address is represented
+      as defined in Section 4 of RFC 5952.";
+      reference
+        "RFC 5952: A Recommendation for IPv6 Address Text
+        	  Representation";
+
+    }
+
+    typedef domain-name {
+      type string {
+        length "1..253";
+        pattern
+          '((([a-zA-Z0-9_]([a-zA-Z0-9\-_]){0,61})?[a-zA-Z0-9]\.)*([a-zA-Z0-9_]([a-zA-Z0-9\-_]){0,61})?[a-zA-Z0-9]\.?)|\.';
+      }
+      description
+        "The domain-name type represents a DNS domain name.  The
+      name SHOULD be fully qualified whenever possible.
+
+      Internet domain names are only loosely specified.  Section
+      3.5 of RFC 1034 recommends a syntax (modified in Section
+      2.1 of RFC 1123).  The pattern above is intended to allow
+      for current practice in domain name use, and some possible
+      future expansion.  It is designed to hold various types of
+      domain names, including names used for A or AAAA records
+      (host names) and other records, such as SRV records.  Note
+      that Internet host names have a stricter syntax (described
+      in RFC 952) than the DNS recommendations in RFCs 1034 and
+      1123, and that systems that want to store host names in
+      schema nodes using the domain-name type are recommended to
+      adhere to this stricter standard to ensure interoperability.
+
+      The encoding of DNS names in the DNS protocol is limited
+      to 255 characters.  Since the encoding consists of labels
+      prefixed by a length bytes and there is a trailing NULL
+      byte, only 253 characters can appear in the textual dotted
+      notation.
+
+      The description clause of schema nodes using the domain-name
+      type MUST describe when and how these names are resolved to
+      IP addresses.  Note that the resolution of a domain-name value
+      may require to query multiple DNS records (e.g., A for IPv4
+      and AAAA for IPv6).  The order of the resolution process and
+      which DNS record takes precedence can either be defined
+      explicitly or may depend on the configuration of the
+      resolver.
+
+      Domain-name values use the US-ASCII encoding.  Their canonical
+      format uses lowercase US-ASCII characters.  Internationalized
+      domain names MUST be A-labels as per RFC 5890.";
+      reference
+        "RFC  952: DoD Internet Host Table Specification
+         RFC 1034: Domain Names - Concepts and Facilities
+         RFC 1123: Requirements for Internet Hosts -- Application
+        	  and Support
+         RFC 2782: A DNS RR for specifying the location of services
+        	  (DNS SRV)
+         RFC 5890: Internationalized Domain Names in Applications
+        	  (IDNA): Definitions and Document Framework";
+
+    }
+
+    typedef host {
+      type union {
+        type ip-address;
+        type domain-name;
+      }
+      description
+        "The host type represents either an IP address or a DNS
+      domain name.";
+    }
+
+    typedef uri {
+      type string;
+      description
+        "The uri type represents a Uniform Resource Identifier
+      (URI) as defined by STD 66.
+
+      Objects using the uri type MUST be in US-ASCII encoding,
+      and MUST be normalized as described by RFC 3986 Sections
+      6.2.1, 6.2.2.1, and 6.2.2.2.  All unnecessary
+      percent-encoding is removed, and all case-insensitive
+      characters are set to lowercase except for hexadecimal
+      digits, which are normalized to uppercase as described in
+      Section 6.2.2.1.
+
+      The purpose of this normalization is to help provide
+      unique URIs.  Note that this normalization is not
+      sufficient to provide uniqueness.  Two URIs that are
+      textually distinct after this normalization may still be
+      equivalent.
+
+      Objects using the uri type may restrict the schemes that
+      they permit.  For example, 'data:' and 'urn:' schemes
+      might not be appropriate.
+
+      A zero-length URI is not a valid URI.  This can be used to
+      express 'URI absent' where required.
+
+      In the value set and its semantics, this type is equivalent
+      to the Uri SMIv2 textual convention defined in RFC 5017.";
+      reference
+        "RFC 3986: Uniform Resource Identifier (URI): Generic Syntax
+         RFC 3305: Report from the Joint W3C/IETF URI Planning Interest
+        	  Group: Uniform Resource Identifiers (URIs), URLs,
+        	  and Uniform Resource Names (URNs): Clarifications
+        	  and Recommendations
+         RFC 5017: MIB Textual Conventions for Uniform Resource
+        	  Identifiers (URIs)";
+
+    }
+  }  // module ietf-inet-types
diff --git a/utils/yangutils/plugin/src/test/resources/interfileietf/ietf-network-topology.yang b/utils/yangutils/plugin/src/test/resources/interfileietf/ietf-network-topology.yang
new file mode 100644
index 0000000..10c8fb9
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/interfileietf/ietf-network-topology.yang
@@ -0,0 +1,260 @@
+ module ietf-network-topology {
+   yang-version 1;
+   namespace "urn:ietf:params:xml:ns:yang:ietf-network-topology";
+   prefix lnk;
+
+   import ietf-inet-types {
+     prefix inet;
+   }
+   import ietf-network {
+     prefix nd;
+   }
+
+   organization
+     "IETF I2RS (Interface to the Routing System) Working Group";
+
+   contact
+     "WG Web:    <http://tools.ietf.org/wg/i2rs/>
+      WG List:   <mailto:i2rs@ietf.org>
+
+      WG Chair:  Susan Hares
+                 <mailto:shares@ndzh.com>
+
+      WG Chair:  Jeffrey Haas
+                 <mailto:jhaas@pfrc.org>
+
+      Editor:    Alexander Clemm
+                 <mailto:alex@cisco.com>
+
+      Editor:    Jan Medved
+                 <mailto:jmedved@cisco.com>
+
+      Editor:    Robert Varga
+                 <mailto:rovarga@cisco.com>
+
+      Editor:    Tony Tkacik
+                 <mailto:ttkacik@cisco.com>
+
+      Editor:    Nitin Bahadur
+                 <mailto:nitin_bahadur@yahoo.com>
+
+      Editor:    Hariharan Ananthakrishnan
+                 <mailto:hari@packetdesign.com>";
+
+   description
+     "This module defines a common base model for network topology,
+      augmenting the base network model with links to connect nodes,
+      as well as termination points to terminate links on nodes.
+
+      Copyright (c) 2015 IETF Trust and the persons identified as
+      authors of the code.  All rights reserved.
+
+      Redistribution and use in source and binary forms, with or
+      without modification, is permitted pursuant to, and subject
+      to the license terms contained in, the Simplified BSD License
+      set forth in Section 4.c of the IETF Trust's Legal Provisions
+      Relating to IETF Documents
+      (http://trustee.ietf.org/license-info).
+
+      This version of this YANG module is part of
+      draft-ietf-i2rs-yang-network-topo-02;
+      see the RFC itself for full legal notices.
+
+      NOTE TO RFC EDITOR: Please replace above reference to
+      draft-ietf-i2rs-yang-network-topo-02 with RFC
+      number when published (i.e. RFC xxxx).";
+
+   revision 2015-12-08 {
+     description
+       "Initial revision.
+        NOTE TO RFC EDITOR: Please replace the following reference
+        to draft-ietf-i2rs-yang-network-topo-02 with
+        RFC number when published (i.e. RFC xxxx).";
+     reference
+       "draft-ietf-i2rs-yang-network-topo-02.";
+   }
+
+   typedef link-id {
+     type inet:uri;
+     description
+       "An identifier for a link in a topology.
+        The identifier SHOULD be chosen such that the same link in a
+        real network topology will always be identified through the
+        same identifier, even if the model is instantiated in
+            separate datastores. An implementation MAY choose to capture
+        semantics in the identifier, for example to indicate the type
+        of link and/or the type of topology that the link is a part
+        of.";
+   }
+
+   typedef tp-id {
+     type inet:uri;
+     description
+       "An identifier for termination points on a node.
+        The identifier SHOULD be chosen such that the same TP in a
+        real network topology will always be identified through the
+        same identifier, even if the model is instantiated in
+        separate datastores. An implementation MAY choose to capture
+        semantics in the identifier, for example to indicate the type
+        of TP and/or the type of node and topology that the TP is a
+        part of.";
+   }
+   grouping link-ref {
+     description
+       "References a link in a specific network.";
+     leaf link-ref {
+       type link-id;
+       description
+         "A type for an absolute reference a link instance.
+          (This type should not be used for relative references.
+          In such a case, a relative path should be used instead.)";
+     }
+     uses nd:network-ref;
+   }
+
+   grouping tp-ref {
+     description
+       "References a termination point in a specific node.";
+     leaf tp-ref {
+       type tp-id;
+       description
+         "A type for an absolute reference to a termination point.
+          (This type should not be used for relative references.
+          In such a case, a relative path should be used instead.)";
+     }
+     uses nd:node-ref;
+   }
+
+   augment "/nd:networks/nd:network" {
+     description
+       "Add links to the network model.";
+     list link {
+       key "link-id";
+       description
+         "A Network Link connects a by Local (Source) node and
+          a Remote (Destination) Network Nodes via a set of the
+          nodes' termination points.
+          As it is possible to have several links between the same
+          source and destination nodes, and as a link could
+          potentially be re-homed between termination points, to
+          ensure that we would always know to distinguish between
+          links, every link is identified by a dedicated link
+          identifier.
+          Note that a link models a point-to-point link, not a
+          multipoint link.
+          Layering dependencies on links in underlay topologies are
+          not represented as the layering information of nodes and of
+          termination points is sufficient.";
+       container source {
+         description
+           "This container holds the logical source of a particular
+            link.";
+         leaf source-node {
+           type nd:node-id;
+           mandatory true;
+           description
+             "Source node identifier, must be in same topology.";
+         }
+         leaf source-tp {
+           type tp-id;
+           description
+             "Termination point within source node that terminates
+              the link.";
+         }
+       }
+       container destination {
+         description
+           "This container holds the logical destination of a
+            particular link.";
+         leaf dest-node {
+           type nd:node-id;
+           mandatory true;
+           description
+             "Destination node identifier, must be in the same
+              network.";
+         }
+         leaf dest-tp {
+           type tp-id;
+           description
+             "Termination point within destination node that
+              terminates the link.";
+         }
+       }
+       leaf link-id {
+         type link-id;
+         description
+           "The identifier of a link in the topology.
+            A link is specific to a topology to which it belongs.";
+       }
+       list supporting-link {
+         key "network-ref link-ref";
+         description
+           "Identifies the link, or links, that this link
+            is dependent on.";
+         leaf network-ref {
+           type nd:network-id;
+           description
+             "This leaf identifies in which underlay topology
+              supporting link is present.";
+         }
+         leaf link-ref {
+           type link-id;
+           description
+             "This leaf identifies a link which is a part
+              of this link's underlay. Reference loops, in which
+              a link identifies itself as its underlay, either
+              directly or transitively, are not allowed.";
+         }
+       }
+     }
+   }
+   augment "/nd:networks/nd:network/nd:node" {
+     description
+       "Augment termination points which terminate links.
+        Termination points can ultimately be mapped to interfaces.";
+     list termination-point {
+       key "tp-id";
+       description
+         "A termination point can terminate a link.
+          Depending on the type of topology, a termination point
+          could, for example, refer to a port or an interface.";
+       leaf tp-id {
+         type tp-id;
+         description
+           "Termination point identifier.";
+       }
+       list supporting-termination-point {
+         key "network-ref node-ref tp-ref";
+         description
+           "The leaf list identifies any termination points that
+            the termination point is dependent on, or maps onto.
+            Those termination points will themselves be contained
+            in a supporting node.
+            This dependency information can be inferred from
+            the dependencies between links.  For this reason,
+            this item is not separately configurable.  Hence no
+            corresponding constraint needs to be articulated.
+            The corresponding information is simply provided by the
+            implementing system.";
+         leaf network-ref {
+           type nd:network-id;
+           description
+             "This leaf identifies in which topology the
+              supporting termination point is present.";
+         }
+         leaf node-ref {
+           type nd:node-id;
+           description
+             "This leaf identifies in which node the supporting
+              termination point is present.";
+         }
+         leaf tp-ref {
+           type tp-id;
+           description
+             "Reference to the underlay node, must be in a
+              different topology";
+         }
+       }
+     }
+   }
+ }
diff --git a/utils/yangutils/plugin/src/test/resources/interfileietf/ietf-network.yang b/utils/yangutils/plugin/src/test/resources/interfileietf/ietf-network.yang
new file mode 100644
index 0000000..9dbe38f
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/interfileietf/ietf-network.yang
@@ -0,0 +1,200 @@
+   module ietf-network {
+     yang-version 1;
+     namespace "urn:ietf:params:xml:ns:yang:ietf-network";
+     prefix nd;
+
+     import ietf-inet-types {
+       prefix inet;
+     }
+
+     organization
+       "IETF I2RS (Interface to the Routing System) Working Group";
+
+     contact
+       "WG Web:    <http://tools.ietf.org/wg/i2rs/>
+        WG List:   <mailto:i2rs@ietf.org>
+
+        WG Chair:  Susan Hares
+                   <mailto:shares@ndzh.com>
+
+        WG Chair:  Jeffrey Haas
+                   <mailto:jhaas@pfrc.org>
+
+        Editor:    Alexander Clemm
+                   <mailto:alex@cisco.com>
+
+        Editor:    Jan Medved
+                   <mailto:jmedved@cisco.com>
+
+        Editor:    Robert Varga
+                   <mailto:rovarga@cisco.com>
+
+        Editor:    Tony Tkacik
+                   <mailto:ttkacik@cisco.com>
+
+        Editor:    Nitin Bahadur
+                   <mailto:nitin_bahadur@yahoo.com>
+
+        Editor:    Hariharan Ananthakrishnan
+                   <mailto:hari@packetdesign.com>";
+
+     description
+       "This module defines a common base model for a collection
+        of nodes in a network. Node definitions are further used
+        in network topologies and inventories.
+
+        Copyright (c) 2015 IETF Trust and the persons identified as
+        authors of the code.  All rights reserved.
+
+        Redistribution and use in source and binary forms, with or
+        without modification, is permitted pursuant to, and subject
+        to the license terms contained in, the Simplified BSD License
+        set forth in Section 4.c of the IETF Trust's Legal Provisions
+        Relating to IETF Documents
+        (http://trustee.ietf.org/license-info).
+
+        This version of this YANG module is part of
+        draft-ietf-i2rs-yang-network-topo-02;
+        see the RFC itself for full legal notices.
+
+        NOTE TO RFC EDITOR: Please replace above reference to
+        draft-ietf-i2rs-yang-network-topo-02 with RFC
+        number when published (i.e. RFC xxxx).";
+
+     revision 2015-12-08 {
+       description
+         "Initial revision.
+          NOTE TO RFC EDITOR: Please replace the following reference
+          to draft-ietf-i2rs-yang-network-topo-02 with
+          RFC number when published (i.e. RFC xxxx).";
+       reference
+         "draft-ietf-i2rs-yang-network-topo-02";
+     }
+
+     typedef node-id {
+       type inet:uri;
+       description
+         "Identifier for a node.";
+     }
+
+     typedef network-id {
+       type inet:uri;
+       description
+         "Identifier for a network.";
+     }
+     grouping network-ref {
+       description
+         "Contains the information necessary to reference a network,
+          for example an underlay network.";
+       leaf network-ref {
+         type network-id;
+         description
+           "Used to reference a network, for example an underlay
+            network.";
+       }
+     }
+
+     grouping node-ref {
+       description
+         "Contains the information necessary to reference a node.";
+       leaf node-ref {
+         type node-id;
+         description
+           "Used to reference a node.
+            Nodes are identified relative to the network they are
+            contained in.";
+       }
+       uses network-ref;
+     }
+
+     container networks {
+       description
+         "Serves as top-level container for a list of networks.";
+       list network {
+         key "network-id";
+         description
+           "Describes a network.
+            A network typically contains an inventory of nodes,
+            topological information (augmented through
+            network-topology model), as well as layering
+            information.";
+         container network-types {
+           description
+             "Serves as an augmentation target.
+              The network type is indicated through corresponding
+              presence containers augmented into this container.";
+         }
+         leaf network-id {
+           type network-id;
+           description
+             "Identifies a network.";
+         }
+         list supporting-network {
+           key "network-ref";
+           description
+             "An underlay network, used to represent layered network
+              topologies.";
+           leaf network-ref {
+             type network-id;
+             description
+               "References the underlay network.";
+           }
+         }
+         list node {
+           key "node-id";
+           description
+             "The inventory of nodes of this network.";
+           leaf node-id {
+             type node-id;
+             description
+               "Identifies a node uniquely within the containing
+                network.";
+           }
+           list supporting-node {
+             key "network-ref node-ref";
+             description
+               "Represents another node, in an underlay network, that
+                this node is supported by.  Used to represent layering
+                structure.";
+             leaf network-ref {
+               type network-id;
+               description
+                 "References the underlay network that the
+                  underlay node is part of.";
+             }
+             leaf node-ref {
+               type node-id;
+               description
+                 "References the underlay node itself.";
+             }
+           }
+         }
+       }
+     }
+     container networks-state {
+       config false;
+       description
+         "Serves as top-level container for a list of state information
+          for networks";
+       list network {
+         key "network-ref";
+         description
+           "Data nodes representing operational data and state of
+            networks.
+            An instance is automatically created for every network
+            in the corresponding list under the networks container.";
+         uses network-ref;
+         leaf server-provided {
+           type boolean;
+           description
+             "Indicates whether the information concerning this
+              particular network is populated by the server
+              (server-provided true, the general case for network
+              information discovered from the server),
+              or whether it is configured by a client
+              (server-provided true, possible e.g. for
+              service overlays managed through a controller).";
+         }
+       }
+     }
+   }
diff --git a/utils/yangutils/plugin/src/test/resources/interfileietf/ietf-schedule.yang b/utils/yangutils/plugin/src/test/resources/interfileietf/ietf-schedule.yang
new file mode 100644
index 0000000..b9f7297
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/interfileietf/ietf-schedule.yang
@@ -0,0 +1,64 @@
+   module ietf-schedule {
+     yang-version 1;
+     namespace "urn:ietf:params:xml:ns:yang:ietf-schedule";
+     // replace with IANA namespace when assigned
+
+     prefix "sch";
+
+     import ietf-yang-types {
+       prefix "yang";
+     }
+
+     organization "TBD";
+     contact "TBD";
+     description
+       "The model allows time scheduling parameters to be specified.";
+
+     revision "2016-03-01" {
+       description "Initial revision";
+       reference "TBD";
+     }
+
+     /*
+      * Groupings
+      */
+
+     grouping schedules {
+       description
+         "A list of schedules defining when a particular
+          configuration takes effect.";
+       container schedules {
+         description
+           "Container of a schedule list defining when a particular
+            configuration takes effect.";
+         list schedule {
+           key "schedule-id";
+           description "A list of schedule elements.";
+
+           leaf schedule-id {
+             type uint32;
+             description "Identifies the schedule element.";
+           }
+           leaf start {
+             type yang:date-and-time;
+             description "Start time.";
+           }
+           leaf schedule-duration {
+             type string {
+               pattern
+                 'P(\d+Y)?(\d+M)?(\d+W)?(\d+D)?T(\d+H)?(\d+M)?(\d+S)?';
+             }
+             description "Schedule duration in ISO 8601 format.";
+           }
+           leaf repeat-interval {
+             type string {
+               pattern
+                 'R\d*/P(\d+Y)?(\d+M)?(\d+W)?(\d+D)?T(\d+H)?(\d+M)?'
+                 + '(\d+S)?';
+             }
+             description "Repeat interval in ISO 8601 format.";
+           }
+         }
+       }
+     } // schedules
+   }
diff --git a/utils/yangutils/plugin/src/test/resources/interfileietf/ietf-te-topology.yang b/utils/yangutils/plugin/src/test/resources/interfileietf/ietf-te-topology.yang
new file mode 100644
index 0000000..849828f
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/interfileietf/ietf-te-topology.yang
@@ -0,0 +1,1730 @@
+   module ietf-te-topology {
+     yang-version 1;
+     namespace "urn:ietf:params:xml:ns:yang:ietf-te-topology";
+     // replace with IANA namespace when assigned
+
+     prefix "tet";
+
+     import ietf-inet-types {
+       prefix "inet";
+     }
+
+     import ietf-schedule {
+       prefix "sch";
+     }
+
+     import ietf-te-types {
+       prefix "te-types";
+     }
+
+     import ietf-network {
+       prefix "nw";
+     }
+
+     import ietf-network-topology {
+       prefix "nt";
+     }
+
+     organization
+       "Traffic Engineering Architecture and Signaling (TEAS)
+        Working Group";
+
+     contact
+       "WG Web:   <http://tools.ietf.org/wg/teas/>
+        WG List:  <mailto:teas@ietf.org>
+
+        WG Chair: Lou Berger
+                  <mailto:lberger@labn.net>
+
+        WG Chair: Vishnu Pavan Beeram
+                  <mailto:vbeeram@juniper.net>
+
+        Editor:   Xufeng Liu
+                  <mailto:xliu@kuatrotech.com>
+
+        Editor:   Igor Bryskin
+                  <mailto:Igor.Bryskin@huawei.com>
+
+        Editor:   Vishnu Pavan Beeram
+                  <mailto:vbeeram@juniper.net>
+
+        Editor:   Tarek Saad
+                  <mailto:tsaad@cisco.com>
+
+        Editor:   Himanshu Shah
+                  <mailto:hshah@ciena.com>
+
+        Editor:   Oscar Gonzalez De Dios
+                  <mailto:oscar.gonzalezdedios@telefonica.com>";
+
+     description "TE topology model";
+
+     revision "2016-03-17" {
+       description "Initial revision";
+       reference "TBD";
+     }
+
+     /*
+      * Features
+      */
+
+     /*feature configuration-schedule {
+       description
+         "This feature indicates that the system supports
+          configuration scheduling.";
+     }
+
+     feature te-topology-hierarchy {
+       description
+         "This feature indicates that the system allows underlay
+          and/or overlay TE topology hierarchy.";
+     }
+
+     feature te-performance-metric {
+       description
+         "This feature indicates that the system supports
+          TE performance metric defined in
+          RFC7471: OSPF Traffic Engineering (TE) Metric Extensions.";
+     }
+
+     feature template {
+       description
+         "This feature indicates that the system supports
+          template configuration.";
+     }*/
+
+     /*
+      * Typedefs
+      */
+     typedef performance-metric-normality {
+       type enumeration {
+         enum "unknown" {
+           value 0;
+           description
+             "Unknown.";
+         }
+         enum "normal" {
+           value 1;
+           description
+             "Normal.";
+         }
+         enum "abnormal" {
+           value 2;
+           description
+             "Abnormal. The anomalous bit is set.";
+         }
+       }
+       description
+         "Indicates whether a performance metric is normal, abnormal, or
+          unknown.";
+       reference
+         "RFC7471: OSPF Traffic Engineering (TE) Metric Extensions.";
+     }
+
+     typedef te-admin-status {
+       type enumeration {
+         enum up {
+           description
+             "Enabled.";
+         }
+         enum down {
+           description
+             "Disabled.";
+         }
+         enum testing {
+           description
+             "In some test mode.";
+         }
+         enum preparing-maintenance {
+           description
+             "Resource is disabled in the control plane to prepare for
+              graceful shutdown for maintenance purposes.";
+           reference
+             "RFC5817: Graceful Shutdown in MPLS and Generalized MPLS
+              Traffic Engineering Networks";
+         }
+         enum maintenance {
+           description
+             "Resource is disabled in the data plane for maintenance
+              purposes.";
+         }
+       }
+       description
+         "Defines a type representing the administrative status of
+          a TE resource.";
+     }
+     typedef te-global-id {
+       type uint32;
+       description
+         "An identifier to uniquely identify an operator, which can be
+          either a provider or a client.
+          The definition of this type is taken from RFC6370 and RFC5003.
+          This attribute type is used solely to provide a globally
+          unique context for TE topologies.";
+     }
+
+     typedef te-link-access-type {
+       type enumeration {
+         enum point-to-point {
+           description
+             "The link is point-to-point.";
+         }
+         enum multi-access {
+           description
+             "The link is multi-access, including broacast and NBMA.";
+         }
+       }
+       description
+         "Defines a type representing the access type of a TE link.";
+       reference
+         "RFC3630: Traffic Engineering (TE) Extensions to OSPF
+          Version 2.";
+     }
+
+     typedef te-node-id {
+       type inet:ip-address;
+       description
+         "An identifier for a node in a topology.
+          The identifier is represented as an IPv4 or IPv6 address.
+          This attribute is mapped to Router ID in
+          RFC3630, RFC5329, RFC5305, and RFC 6119.";
+     }
+
+     typedef te-oper-status {
+       type enumeration {
+         enum up {
+           description
+           "Operational up.";
+         }
+         enum down {
+           description
+           "Operational down.";
+         }
+         enum testing {
+           description
+           "In some test mode.";
+         }
+         enum unknown {
+           description
+           "Status cannot be determined for some reason.";
+         }
+         enum preparing-maintenance {
+           description
+             "Resource is disabled in the control plane to prepare for
+              graceful shutdown for maintenance purposes.";
+           reference
+             "RFC5817: Graceful Shutdown in MPLS and Generalized MPLS
+              Traffic Engineering Networks";
+         }
+         enum maintenance {
+           description
+             "Resource is disabled in the data plane for maintenance
+              purposes.";
+         }
+       }
+       description
+         "Defines a type representing the operational status of
+          a TE resource.";
+     }
+
+     typedef te-recovery-status {
+       type enumeration {
+         enum normal {
+           description
+             "Both the recovery and working spans are fully
+              allocated and active, data traffic is being
+              transported over (or selected from) the working
+              span, and no trigger events are reported.";
+         }
+         enum recovery-started {
+           description
+             "The recovery action has been started, but not completed.";
+         }
+         enum recovery-succeeded {
+           description
+             "The recovery action has succeeded. The working span has
+              reported a failure/degrade condition and the user traffic
+              is being transported (or selected) on the recovery span.";
+         }
+         enum recovery-failed {
+           description
+             "The recovery action has failed.";
+         }
+         enum reversion-started {
+           description
+             "The reversion has started.";
+         }
+         enum reversion-failed {
+           description
+             "The reversion has failed.";
+         }
+         enum recovery-unavailable {
+           description
+             "The recovery is unavailable -- either as a result of an
+              operator Lockout command or a failure condition detected
+              on the recovery span.";
+         }
+         enum recovery-admin {
+           description
+             "The operator has issued a command switching the user
+              traffic to the recovery span.";
+         }
+         enum wait-to-restore {
+           description
+             "The recovery domain is recovering from a failuer/degrade
+              condition on the working span that is being controlled by
+              the Wait-to-Restore (WTR) timer.";
+         }
+       }
+       description
+         "Defines the status of a recovery action.";
+       reference
+         "RFC4427: Recovery (Protection and Restoration) Terminology
+          for Generalized Multi-Protocol Label Switching (GMPLS).
+          RFC6378: MPLS Transport Profile (MPLS-TP) Linear Protection";
+     }
+
+     typedef te-template-name {
+       type string {
+         pattern '/?([a-zA-Z0-9\-_.]+)(/[a-zA-Z0-9\-_.]+)*';
+       }
+       description
+         "A type for the name of a TE node template or TE link
+          template.";
+     }
+
+     typedef te-topology-event-type {
+       type enumeration {
+         enum "add" {
+           value 0;
+           description
+             "A TE node or te-link has been added.";
+         }
+         enum "remove" {
+           value 1;
+           description
+             "A TE node or te-link has been removed.";
+         }
+         enum "update" {
+           value 2;
+           description
+             "A TE node or te-link has been updated.";
+         }
+       }
+       description "TE  Event type for notifications";
+     } // te-topology-event-type
+     typedef te-topology-id {
+       type string {
+         pattern '/?([a-zA-Z0-9\-_.]+)(/[a-zA-Z0-9\-_.]+)*';
+       }
+       description
+         "An identifier for a topology.";
+     }
+
+     typedef te-tp-id {
+       type union {
+         type uint32;          // Unnumbered
+         type inet:ip-address; // IPv4 or IPv6 address
+       }
+       description
+         "An identifier for a TE link endpoint on a node.
+          This attribute is mapped to local or remote link identifier in
+          RFC3630 and RFC5305.";
+     }
+
+     /*
+      * Identities
+      */
+
+     /*
+      * Groupings
+      */
+     grouping information-source-attributes {
+       description
+         "The attributes identifying source that has provided the
+          related information, and the source credibility.";
+       leaf information-source {
+         type enumeration {
+           enum "unknown" {
+             description "The source is unknown.";
+           }
+           enum "locally-configured" {
+             description "Configured entity.";
+           }
+           enum "ospfv2" {
+             description "OSPFv2.";
+           }
+           enum "ospfv3" {
+             description "OSPFv3.";
+           }
+           enum "isis" {
+             description "ISIS.";
+           }
+           enum "system-processed" {
+             description "System processed entity.";
+           }
+           enum "other" {
+             description "Other source.";
+           }
+         }
+         description
+           "Indicates the source of the information.";
+       }
+       container information-source-state {
+         description
+           "The container contains state attributes related to
+            the information source.";
+         leaf credibility-preference {
+           type uint16;
+           description
+             "The preference value to calculate the traffic
+              engineering database credibility value used for
+              tie-break selection between different
+              information-source values.
+              Higher value is more preferable.";
+         }
+         container topology {
+           description
+             "When the information is processed by the system,
+              the attributes in this container indicate which topology
+              is used to process to generate the result information.";
+           uses te-topology-ref;
+         } // topology
+         leaf routing-instance {
+           type string;
+           description
+             "When applicable, this is the name of a routing instance
+              from which the information is learned.";
+         } // routing-information
+       }
+     } // information-source-attributes
+
+     grouping performance-metric-attributes {
+       description
+         "Link performance information in real time.";
+       reference
+         "RFC7471: OSPF Traffic Engineering (TE) Metric Extensions.";
+       leaf unidirectional-delay {
+         type uint32 {
+           range 0..16777215;
+         }
+         description "Delay or latency in micro seconds.";
+       }
+       leaf unidirectional-min-delay {
+         type uint32 {
+           range 0..16777215;
+         }
+         description "Minimum delay or latency in micro seconds.";
+       }
+       leaf unidirectional-max-delay {
+         type uint32 {
+           range 0..16777215;
+         }
+         description "Maximum delay or latency in micro seconds.";
+       }
+       leaf unidirectional-delay-variation {
+         type uint32 {
+           range 0..16777215;
+         }
+         description "Delay variation in micro seconds.";
+       }
+       leaf unidirectional-packet-loss {
+         type decimal64 {
+           /*fraction-digits 6;
+           range "0 .. 50.331642";*/
+         }
+         description
+           "Packet loss as a percentage of the total traffic sent
+            over a configurable interval. The finest precision is
+            0.000003%.";
+       }
+       leaf unidirectional-residual-bandwidth {
+         type decimal64 {
+           /*fraction-digits 2;*/
+         }
+         description
+           "Residual bandwidth that subtracts tunnel
+            reservations from Maximum Bandwidth (or link capacity)
+            [RFC3630] and provides an aggregated remainder across QoS
+            classes.";
+       }
+       leaf unidirectional-available-bandwidth {
+         type decimal64 {
+           /*fraction-digits 2;*/
+         }
+         description
+           "Available bandwidth that is defined to be residual
+            bandwidth minus the measured bandwidth used for the
+            actual forwarding of non-RSVP-TE LSP packets.  For a
+            bundled link, available bandwidth is defined to be the
+            sum of the component link available bandwidths.";
+       }
+       leaf unidirectional-utilized-bandwidth {
+         type decimal64 {
+           /*fraction-digits 2;*/
+         }
+         description
+           "Bandwidth utilization that represents the actual
+            utilization of the link (i.e. as measured in the router).
+            For a bundled link, bandwidth utilization is defined to
+            be the sum of the component link bandwidth
+            utilizations.";
+       }
+     } // performance-metric-attributes
+     grouping performance-metric-normality-attributes {
+       description
+         "Link performance metric normality attributes.";
+       reference
+         "RFC7471: OSPF Traffic Engineering (TE) Metric Extensions.";
+       leaf unidirectional-delay {
+         type performance-metric-normality;
+         description "Delay normality.";
+       }
+       leaf unidirectional-min-delay {
+         type performance-metric-normality;
+         description "Minimum delay or latency normality.";
+       }
+       leaf unidirectional-max-delay {
+         type performance-metric-normality;
+         description "Maximum delay or latency normality.";
+       }
+       leaf unidirectional-delay-variation {
+         type performance-metric-normality;
+         description "Delay variation normality.";
+       }
+       leaf unidirectional-packet-loss {
+         type performance-metric-normality;
+         description "Packet loss normality.";
+       }
+       leaf unidirectional-residual-bandwidth {
+         type performance-metric-normality;
+         description "Residual bandwidth normality.";
+       }
+       leaf unidirectional-available-bandwidth {
+         type performance-metric-normality;
+         description "Available bandwidth normality.";
+       }
+       leaf unidirectional-utilized-bandwidth {
+         type performance-metric-normality;
+         description "Bandwidth utilization normality.";
+       }
+     } // performance-metric-normality-attributes
+
+     grouping performance-metric-throttle-container {
+       description
+         "A container controlling performance metric throttle.";
+       container performance-metric-throttle {
+         if-feature te-performance-metric;
+         /*must "suppression-interval >= measure-interval" {
+           error-message
+             "suppression-interval cannot be less then
+              measure-interval.";
+           description
+             "Constraint on suppression-interval and
+              measure-interval.";
+         }*/
+         description
+           "Link performance information in real time.";
+         reference
+           "RFC7471: OSPF Traffic Engineering (TE) Metric Extensions.";
+         leaf unidirectional-delay-offset {
+           type uint32 {
+             range 0..16777215;
+           }
+           description
+             "Offset value to be added to the measured delay value.";
+         }
+         leaf measure-interval {
+           type uint32;
+           default 30;
+           description
+             "Interval in seconds to measure the extended metric
+              values.";
+         }
+         leaf advertisement-interval {
+           type uint32;
+           description
+             "Interval in seconds to advertise the extended metric
+              values.";
+         }
+         leaf suppression-interval {
+           type uint32 {
+             range "1..max";
+           }
+           default 120;
+           description
+             "Interval in seconds to suppress advertising the extended
+              metric values.";
+         }
+         container threshold-out {
+           uses performance-metric-attributes;
+           description
+             "If the measured parameter falls outside an upper bound
+              for all but the min delay metric (or lower bound for
+              min-delay metric only) and the advertised value is not
+              already outside that bound, anomalous announcement will be
+              triggered.";
+         }
+         container threshold-in {
+           uses performance-metric-attributes;
+           description
+             "If the measured parameter falls inside an upper bound
+              for all but the min delay metric (or lower bound for
+              min-delay metric only) and the advertised value is not
+              already inside that bound, normal (anomalous-flag cleared)
+              announcement will be triggered.";
+         }
+         container threshold-accelerated-advertisement {
+           description
+             "When the difference between the last advertised value and
+              current measured value exceed this threshold, anomalous
+              announcement will be triggered.";
+           uses performance-metric-attributes;
+         }
+       }
+     } // performance-metric-throttle-container
+
+     grouping te-link-augment {
+       description
+         "Augmentation for TE link.";
+
+       container te {
+         presence "TE support.";
+         description
+           "Indicates TE support.";
+
+         container config {
+           description
+             "Configuration data.";
+           uses te-link-config;
+         } // config
+         container state {
+           config false;
+           description
+             "Operational state data.";
+           uses te-link-config;
+           uses te-link-state-derived;
+         } // state
+       } // te
+     } // te-link-augment
+
+     grouping te-link-config {
+       description
+         "TE link configuration grouping.";
+       choice bundle-stack-level {
+         description
+           "The TE link can be partitioned into bundled
+            links, or component links.";
+         case bundle {
+           container bundled-links {
+             description
+               "A set of bundled links.";
+             reference
+               "RFC4201: Link Bundling in MPLS Traffic Engineering
+               (TE).";
+             list bundled-link {
+               key "sequence";
+               description
+                 "Specify a bundled interface that is
+                  further partitioned.";
+               leaf sequence {
+                 type uint32;
+                 description
+                   "Identify the sequence in the bundle.";
+               }
+               leaf src-tp-ref {
+                 type nt:tp-id;
+                 description
+                   "Reference to another TE termination point on the
+                    same souruce node.";
+               }
+               leaf des-tp-ref {
+                 type nt:tp-id;
+                 description
+                   "Reference to another TE termination point on the
+                    same destination node.";
+               }
+             } // list bundled-link
+           }
+         }
+         case component {
+           container component-links {
+             description
+               "A set of component links";
+             list component-link {
+               key "sequence";
+               description
+                 "Specify a component interface that is
+                  sufficient to unambiguously identify the
+                  appropriate resources";
+
+               leaf sequence {
+                 type uint32;
+                 description
+                   "Identify the sequence in the bundle.";
+               }
+               leaf src-interface-ref {
+                 type string;
+                 description
+                   "Reference to component link interface on the
+                    source node.";
+               }
+               leaf des-interface-ref {
+                 type string;
+                 description
+                   "Reference to component link interface on the
+                    destinatioin node.";
+               }
+             }
+           }
+         }
+       } // bundle-stack-level
+
+       leaf-list te-link-template {
+         if-feature template;
+         type te-template-name;
+         description
+           "The reference to a TE link template.";
+       }
+       uses te-link-config-attributes;
+     } // te-link-config
+
+     grouping te-link-config-attributes {
+       description
+         "Link configuration attributes in a TE topology.";
+       container te-link-attributes {
+         description "Link attributes in a TE topology.";
+         uses sch:schedules;
+         leaf access-type {
+           type te-link-access-type;
+           description
+             "Link access type, which can be point-to-point or
+              multi-access.";
+         }
+         leaf is-abstract {
+           type empty;
+           description "Present if the link is abstract.";
+         }
+         leaf name {
+           type string;
+           description "Link Name.";
+         }
+         container underlay {
+           if-feature te-topology-hierarchy;
+           presence
+             "Indicates the underlay exists for this link.";
+           description "Attributes of the te-link underlay.";
+           reference
+             "RFC4206: Label Switched Paths (LSP) Hierarchy with
+              Generalized Multi-Protocol Label Switching (GMPLS)
+              Traffic Engineering (TE)";
+
+           uses te-link-underlay-attributes;
+         } // underlay
+         leaf admin-status {
+           type te-admin-status;
+           description
+             "The administrative state of the link.";
+         }
+
+         uses performance-metric-throttle-container;
+         uses te-link-info-attributes;
+       } // te-link-attributes
+     } // te-link-config-attributes
+
+     grouping te-link-info-attributes {
+       description
+         "Advertised TE information attributes.";
+       leaf link-index {
+         type uint64;
+         description
+           "The link identifier.  If OSPF is used, this represents an
+            ospfLsdbID.  If IS-IS is used, this represents an isisLSPID.
+            If a locally configured link is used, this object represents
+            a unique value, which is locally defined in a router.";
+       }
+       leaf administrative-group {
+         type te-types:admin-groups;
+         description
+           "Administrative group or color of the link.
+            This attribute covers both administrative group (defined in
+            RFC3630, RFC5329, and RFC5305), and extended administrative
+            group (defined in RFC7308).";
+       }
+       leaf max-link-bandwidth {
+         type decimal64 {
+           /*fraction-digits 2;*/
+         }
+         description
+           "Maximum bandwidth that can be seen on this link in this
+            direction. Units in bytes per second.";
+         reference
+           "RFC3630: Traffic Engineering (TE) Extensions to OSPF
+            Version 2.
+            RFC5305: IS-IS Extensions for Traffic Engineering.";
+       }
+       leaf max-resv-link-bandwidth {
+         type decimal64 {
+           /*fraction-digits 2;*/
+         }
+         description
+           "Maximum amount of bandwidth that can be reserved in this
+            direction in this link. Units in bytes per second.";
+         reference
+           "RFC3630: Traffic Engineering (TE) Extensions to OSPF
+            Version 2.
+            RFC5305: IS-IS Extensions for Traffic Engineering.";
+       }
+       list unreserved-bandwidth {
+         key "priority";
+         max-elements "8";
+         description
+           "Unreserved bandwidth for 0-7 priority levels. Units in
+            bytes per second.";
+         reference
+           "RFC3630: Traffic Engineering (TE) Extensions to OSPF
+            Version 2.
+            RFC5305: IS-IS Extensions for Traffic Engineering.";
+         leaf priority {
+           type uint8 {
+             range "0..7";
+           }
+           description "Priority.";
+         }
+         leaf bandwidth {
+           type decimal64 {
+             /*fraction-digits 2;*/
+           }
+           description
+             "Unreserved bandwidth for this level.";
+         }
+       }
+       leaf te-default-metric {
+         type uint32;
+         description
+           "Traffic Engineering Metric.";
+       }
+       container performance-metric {
+         if-feature te-performance-metric;
+         description
+           "Link performance information in real time.";
+         reference
+           "RFC7471: OSPF Traffic Engineering (TE) Metric Extensions.";
+         container measurement {
+           description
+             "Measured performance metric values. Static configuration
+              and manual overrides of these measurements are also
+              allowed.";
+           uses performance-metric-attributes;
+         }
+         container normality
+         {
+           description
+             "Performance metric normality values.";
+           uses performance-metric-normality-attributes;
+         }
+       }
+       leaf link-protection-type {
+         type enumeration {
+           enum "unprotected" {
+             description "Unprotected.";
+           }
+           enum "extra-traffic" {
+             description "Extra traffic.";
+           }
+           enum "shared" {
+             description "Shared.";
+           }
+           enum "1-for-1" {
+             description "One for one protection.";
+           }
+           enum "1-plus-1" {
+             description "One plus one protection.";
+           }
+           enum "enhanced" {
+             description "Enhanced protection.";
+           }
+         }
+         description
+           "Link Protection Type desired for this link.";
+         reference
+           "RFC4202: Routing Extensions in Support of
+            Generalized Multi-Protocol Label Switching (GMPLS).";
+       }
+       list interface-switching-capability {
+         key "switching-capability";
+         description
+           "List of Interface Switching Capabilities Descriptors (ISCD)
+            for this link.";
+         reference
+           "RFC3471: Generalized Multi-Protocol Label Switching (GMPLS)
+            Signaling Functional Description.
+            RFC4203: OSPF Extensions in Support of Generalized
+            Multi-Protocol Label Switching (GMPLS).";
+         leaf switching-capability {
+           type string;
+           description
+             "Switching Capability for this interface.";
+         }
+         leaf encoding {
+           type string;
+           description
+             "Encoding supported by this interface.";
+         }
+         list max-lsp-bandwidth {
+           key "priority";
+           max-elements "8";
+           description
+             "Maximum LSP Bandwidth at priorities 0-7.";
+           leaf priority {
+             type uint8 {
+               range "0..7";
+             }
+             description "Priority.";
+           }
+           leaf bandwidth {
+             type decimal64 {
+               /*fraction-digits 2;*/
+             }
+             description
+               "Max LSP Bandwidth for this level";
+           }
+         }
+         container time-division-multiplex-capable {
+           when "../switching-capability = 'TDM'" {
+             description "Valid only for TDM";
+           }
+           description
+             "Interface has time-division multiplex capabilities.";
+
+           leaf minimum-lsp-bandwidth {
+             type decimal64 {
+               /*fraction-digits 2;*/
+             }
+             description
+               "Minimum LSP Bandwidth. Units in bytes per second.";
+           }
+           leaf indication {
+             type enumeration {
+               enum "standard" {
+                 description
+                   "Indicates support of standard SONET/SDH.";
+               }
+               enum "arbitrary" {
+                 description
+                   "Indicates support of arbitrary SONET/SDH.";
+               }
+             }
+             description
+               "Indication whether the interface supports Standard or
+                Arbitrary SONET/SDH";
+           }
+         }
+         list interface-adjustment-capability {
+           key "upper-sc";
+           description
+             "List of Interface Adjustment Capability Descriptors (IACD)
+              for this link.";
+           reference
+             "RFC6001: Generalized MPLS (GMPLS) Protocol Extensions
+              for Multi-Layer and Multi-Region Networks (MLN/MRN).";
+           leaf upper-sc {
+             type string;
+             description
+               "Switching Capability for this interface.";
+           }
+           leaf upper-encoding {
+             type string;
+             description
+               "Encoding supported by this interface.";
+           }
+           list max-lsp-bandwidth {
+             key "priority";
+             max-elements "8";
+             description
+               "Maximum LSP Bandwidth at priorities 0-7.";
+             leaf priority {
+               type uint8 {
+                 range "0..7";
+               }
+               description "Priority.";
+             }
+             leaf bandwidth {
+               type decimal64 {
+                 /*fraction-digits 2;*/
+               }
+               description
+                 "Max LSP Bandwidth for this level.";
+             }
+           }
+         } // interface-adjustment-capability
+       } // interface-switching-capability
+       container te-srlgs {
+         description
+           "A list of SLRGs.";
+         leaf-list values {
+           type te-types:srlg;
+           description "SRLG value.";
+           reference
+             "RFC4202: Routing Extensions in Support of
+              Generalized Multi-Protocol Label Switching (GMPLS).";
+         }
+       }
+     } // te-link-info-attributes
+
+     grouping te-link-state-derived {
+       description
+         "Link state attributes in a TE topology.";
+       leaf oper-status {
+         type te-oper-status;
+         description
+           "The current operational state of the link.";
+       }
+       uses information-source-attributes;
+       list alt-information-sources {
+         key "information-source";
+         description
+           "A list of information sources learned but not used.";
+         uses information-source-attributes;
+         uses te-link-info-attributes;
+       }
+       container recovery {
+         description
+           "Status of the recovery process.";
+         leaf restoration-status {
+           type te-recovery-status;
+           description
+             "Restoration status.";
+         }
+         leaf protection-status {
+           type te-recovery-status;
+           description
+             "Protection status.";
+         }
+       }
+       container underlay {
+         if-feature te-topology-hierarchy;
+         description "State attributes for te-link underlay.";
+         uses te-link-state-underlay-attributes;
+       }
+     } // te-link-state-derived
+     grouping te-link-state-underlay-attributes {
+       description "State attributes for te-link underlay.";
+       leaf dynamic {
+         type boolean;
+         description
+           "true if the underlay is dynamically created.";
+       }
+       leaf committed {
+         type boolean;
+         description
+           "true if the underlay is committed.";
+       }
+     } // te-link-state-underlay-attributes
+
+     grouping te-link-underlay-attributes {
+       description "Attributes for  te-link underlay.";
+       reference
+         "RFC4206: Label Switched Paths (LSP) Hierarchy with
+          Generalized Multi-Protocol Label Switching (GMPLS)
+          Traffic Engineering (TE)";
+       container underlay-primary-path {
+         description
+           "The service path on the underlay topology that
+            supports this link.";
+         uses te-topology-ref;
+         list path-element {
+           key "path-element-id";
+           description
+             "A list of path elements describing the service path.";
+           leaf path-element-id {
+             type uint32;
+             description "To identify the element in a path.";
+           }
+           uses te-path-element;
+         }
+       } // underlay-primary-path
+       list underlay-backup-path {
+         key "index";
+         description
+           "A list of backup service paths on the underlay topology that
+            protect the underlay primary path. If the primary path is
+            not protected, the list contains zero elements. If the
+            primary path is protected, the list contains one or more
+            elements.";
+         leaf index {
+           type uint32;
+           description
+             "A sequence number to identify a backup path.";
+         }
+         uses te-topology-ref;
+         list path-element {
+           key "path-element-id";
+           description
+             "A list of path elements describing the backup service
+              path";
+           leaf path-element-id {
+             type uint32;
+             description "To identify the element in a path.";
+           }
+           uses te-path-element;
+         }
+       } // underlay-backup-path
+       leaf underlay-protection-type {
+         type uint16;
+         description
+           "Underlay protection type desired for this link";
+       }
+       container underlay-trail-src {
+         uses nt:tp-ref;
+         description
+           "Source TE link of the underlay trail.";
+       }
+       container underlay-trail-des {
+         uses nt:tp-ref;
+         description
+           "Destination TE link of the underlay trail.";
+       }
+     } // te-link-underlay-attributes
+
+     grouping te-node-augment {
+       description
+         "Augmentation for TE node.";
+
+       container te {
+         presence "TE support.";
+         description
+           "Indicates TE support.";
+
+         leaf te-node-id {
+           type te-node-id;
+           mandatory true;
+           description
+             "The identifier of a node in the TE topology.
+              A node is specific to a topology to which it belongs.";
+         }
+
+         container config {
+           description
+             "Configuration data.";
+           uses te-node-config;
+         } // config
+         container state {
+           config false;
+           description
+             "Operational state data.";
+
+           uses te-node-config;
+           uses te-node-state-derived;
+         } // state
+
+         list tunnel-termination-point {
+           key "tunnel-tp-id";
+           description
+             "A termination point can terminate a tunnel.";
+           leaf tunnel-tp-id {
+             type binary;
+             description
+               "Tunnel termination point identifier.";
+           }
+           container config {
+             description
+               "Configuration data.";
+             uses te-node-tunnel-termination-capability;
+           }
+
+           container state {
+             config false;
+             description
+               "Operational state data.";
+
+             uses te-node-tunnel-termination-capability;
+             leaf switching-capability {
+               type string;
+               mandatory true;
+               description
+                 "Switching Capability.";
+             }
+             leaf encoding {
+               type string;
+               mandatory true;
+               description
+                 "Encoding type.";
+             }
+           } // state
+
+         } // tunnel-termination-point
+       } // te
+     } // te-node-augment
+
+     grouping te-node-config {
+       description "TE node configuration grouping.";
+
+       leaf-list te-node-template {
+         if-feature template;
+         type te-template-name;
+         description
+           "The reference to a TE node template.";
+       }
+       uses te-node-config-attributes;
+     } // te-node-config
+
+     grouping te-node-config-attributes {
+       description "Configuration node attributes in a TE topology.";
+       container te-node-attributes {
+         description "Containing node attributes in a TE topology.";
+         uses sch:schedules;
+         leaf admin-status {
+           type te-admin-status;
+           description
+             "The administrative state of the link.";
+         }
+         uses te-node-connectivity-matrix;
+         uses te-node-info-attributes;
+       } // te-node-attributes
+     } // te-node-config-attributes
+
+     grouping te-node-config-attributes-notification {
+       description
+         "Configuration node attributes for template in a TE topology.";
+       container te-node-attributes {
+         description "Containing node attributes in a TE topology.";
+         uses sch:schedules;
+         leaf admin-status {
+           type te-admin-status;
+           description
+             "The administrative state of the link.";
+         }
+         uses te-node-connectivity-matrix-abs;
+         uses te-node-info-attributes;
+       } // te-node-attributes
+     } // te-node-config-attributes-notification
+
+     grouping te-node-config-attributes-template {
+       description
+         "Configuration node attributes for template in a TE topology.";
+       container te-node-attributes {
+         description "Containing node attributes in a TE topology.";
+         uses sch:schedules;
+         leaf admin-status {
+           type te-admin-status;
+           description
+             "The administrative state of the link.";
+         }
+         uses te-node-info-attributes;
+       } // te-node-attributes
+     } // te-node-config-attributes-template
+
+     grouping te-node-connectivity-matrix {
+       description "Connectivity matrix on a TE node.";
+       list connectivity-matrix {
+         key "id";
+         description
+           "Represents node's switching limitations, i.e. limitations
+            in interconnecting network TE links across the node.";
+         reference
+           "RFC7579: General Network Element Constraint Encoding
+            for GMPLS-Controlled Networks.";
+         leaf id {
+           type uint32;
+           description "Identifies the connectivity-matrix entry.";
+         }
+         container from {
+           leaf tp-ref {
+             type nt:tp-id;
+             description
+               "Relative reference to source termination point.";
+           }
+           description
+             "Reference to source NTP.";
+         }
+         container to {
+           leaf tp-ref {
+             type nt:tp-id;
+             description
+               "Relative reference to destination termination point.";
+           }
+           description
+             "Reference to destination NTP.";
+         }
+         leaf is-allowed {
+           type boolean;
+           description
+             "true  - switching is allowed,
+              false - switching is disallowed.";
+         }
+       }
+     } // te-node-connectivity-matrix
+
+     grouping te-node-connectivity-matrix-abs {
+       description
+         "Connectivity matrix on a TE node, using absolute
+          paths to reference termination points.";
+       list connectivity-matrix {
+         key "id";
+         description
+           "Represents node's switching limitations, i.e. limitations
+            in interconnecting network TE links across the node.";
+         reference
+           "RFC7579: General Network Element Constraint Encoding
+            for GMPLS-Controlled Networks.";
+         leaf id {
+           type uint32;
+           description "Identifies the connectivity-matrix entry.";
+         }
+         container from {
+           uses nt:tp-ref;
+           description
+             "Reference to source NTP.";
+         }
+         container to {
+           uses nt:tp-ref;
+           description
+             "Reference to destination NTP.";
+         }
+         leaf is-allowed {
+           type boolean;
+           description
+             "true  - switching is allowed,
+              false - switching is disallowed.";
+         }
+       }
+     } // te-node-connectivity-matrix-abs
+
+     grouping te-node-info-attributes {
+       description
+         "Advertised TE information attributes.";
+       leaf domain-id {
+         type uint32;
+         description
+           "Identifies the domain that this node belongs.
+            This attribute is used to support inter-domain links.";
+         reference
+           "RFC5152: A Per-Domain Path Computation Method for
+            Establishing Inter-Domain Traffic Engineering (TE)
+            Label Switched Paths (LSPs).
+            RFC5392: OSPF Extensions in Support of Inter-Autonomous
+            System (AS) MPLS and GMPLS Traffic Engineering.
+            RFC5316: ISIS Extensions in Support of Inter-Autonomous
+            System (AS) MPLS and GMPLS Traffic Engineering.";
+       }
+       leaf is-abstract {
+         type empty;
+         description
+           "Present if the node is abstract, not present if the node
+            is actual.";
+       }
+       leaf name {
+         type inet:domain-name;
+         description "Node name.";
+       }
+       leaf-list signaling-address {
+         type inet:ip-address;
+         description "Node signaling address.";
+       }
+       container underlay-topology {
+         if-feature te-topology-hierarchy;
+         description
+           "When an abstract node encapsulates a topology,
+            the attributes in this container point to said topology.";
+         uses te-topology-ref;
+       }
+     } // te-node-info-attributes
+
+     grouping te-node-state-derived {
+       description "Node state attributes in a TE topology.";
+       leaf oper-status {
+         type te-oper-status;
+         description
+           "The current operational state of the node.";
+       }
+       leaf is-multi-access-dr {
+         type empty;
+         description
+           "The presence of this attribute indicates that this TE node
+            is a pseudonode elected as a designated router.";
+         reference
+           "RFC3630: Traffic Engineering (TE) Extensions to OSPF
+            Version 2.
+            RFC1195: Use of OSI IS-IS for Routing in TCP/IP and Dual
+            Environments.";
+       }
+       uses information-source-attributes;
+       list alt-information-sources {
+         key "information-source";
+         description
+           "A list of information sources learned but not used.";
+         uses information-source-attributes;
+         uses te-node-connectivity-matrix;
+         uses te-node-info-attributes;
+       }
+     } // te-node-state-derived
+
+     grouping te-node-state-derived-notification {
+       description "Node state attributes in a TE topology.";
+       leaf oper-status {
+         type te-oper-status;
+         description
+           "The current operational state of the node.";
+       }
+       leaf is-multi-access-dr {
+         type empty;
+         description
+           "The presence of this attribute indicates that this TE node
+            is a pseudonode elected as a designated router.";
+         reference
+           "RFC3630: Traffic Engineering (TE) Extensions to OSPF
+            Version 2.
+            RFC1195: Use of OSI IS-IS for Routing in TCP/IP and Dual
+            Environments.";
+       }
+       uses information-source-attributes;
+       list alt-information-sources {
+         key "information-source";
+         description
+           "A list of information sources learned but not used.";
+         uses information-source-attributes;
+         uses te-node-connectivity-matrix-abs;
+         uses te-node-info-attributes;
+       }
+     } // te-node-state-derived-notification
+
+     grouping te-node-tunnel-termination-capability {
+       description
+         "Termination capability of a tunnel termination point on a
+          TE node.";
+
+       list termination-capability {
+         key "link-tp";
+         description
+           "The termination capabilities between
+            tunnel-termination-point and link termination-point.
+            The capability information can be used to compute
+            the tunnel path.";
+         leaf link-tp {
+           type nt:tp-id;
+           description
+             "Link termination point.";
+         }
+       } // termination-capability
+     } // te-node-tunnel-termination-capability
+
+     grouping te-path-element {
+       description
+         "A group of attributes defining an element in a TE path
+          such as TE node, TE link, TE atomic resource or label.";
+       uses te-types:explicit-route-subobject;
+     } // te-path-element
+
+     grouping te-termination-point-augment {
+       description
+         "Augmentation for TE termination point.";
+
+       container te {
+         presence "TE support.";
+         description
+           "Indicates TE support.";
+
+         leaf te-tp-id {
+           type te-tp-id;
+           mandatory true;
+           description
+             "An identifier to uniquely identify a TE termination
+              point.";
+         }
+
+         container config {
+           description
+             "Configuration data.";
+           uses te-termination-point-config;
+         } // config
+         container state {
+           config false;
+           description
+             "Operational state data.";
+           uses te-termination-point-config;
+         } // state
+       } // te
+     } // te-termination-point-augment
+
+     grouping te-termination-point-config {
+       description
+         "TE termination point configuration grouping.";
+       uses sch:schedules;
+     } // te-termination-point-config
+
+     grouping te-topologies-augment {
+       description
+         "Augmentation for TE topologies.";
+
+       container te {
+         presence "TE support.";
+         description
+           "Indicates TE support.";
+
+         container templates {
+           description
+             "Configuration parameters for templates used for TE
+              topology.";
+
+           list node-template {
+             if-feature template;
+             key "name";
+             leaf name {
+               type te-template-name;
+               description
+                 "The name to identify a TE node template.";
+             }
+             description
+               "The list of TE node templates used to define sharable
+                and reusable TE node attributes.";
+             uses template-attributes;
+             uses te-node-config-attributes-template;
+           } // node-template
+
+           list link-template {
+             if-feature template;
+             key "name";
+             leaf name {
+               type te-template-name;
+               description
+                 "The name to identify a TE link template.";
+             }
+             description
+               "The list of TE link templates used to define sharable
+                and reusable TE link attributes.";
+             uses template-attributes;
+             uses te-link-config-attributes;
+           } // link-template
+         } // templates
+       } // te
+     } // te-topologies-augment
+
+     grouping te-topology-augment {
+       description
+         "Augmentation for TE topology.";
+
+       container te {
+         presence "TE support.";
+         description
+           "Indicates TE support.";
+
+         leaf provider-id {
+           type te-global-id;
+           mandatory true;
+           description
+             "An identifier to uniquely identify a provider.";
+         }
+         leaf client-id {
+           type te-global-id;
+           mandatory true;
+           description
+             "An identifier to uniquely identify a client.";
+         }
+         leaf te-topology-id {
+           type te-topology-id;
+           mandatory true;
+           description
+             "It is presumed that a datastore will contain many
+              topologies. To distinguish between topologies it is
+              vital to have UNIQUE topology identifiers.";
+         }
+
+         container config {
+           description
+             "Configuration data.";
+           uses te-topology-config;
+         } // config
+         container state {
+           config false;
+           description
+             "Operational state data.";
+           uses te-topology-config;
+         } // state
+       } // te
+     } // te-topology-augment
+
+     grouping te-topology-config {
+       description
+         "TE topology configuration grouping.";
+       uses sch:schedules;
+       leaf preference {
+         type uint8 {
+           range "1..255";
+         }
+         description
+           "Specifies a preference for this topology. A lower number
+            indicates a higher preference.";
+       }
+     } // te-topology-config
+
+     grouping te-topology-ref {
+       description
+         "References a TE topology.";
+       leaf provider-id-ref {
+         type te-global-id;
+         description
+           "A reference to a provider-id.";
+       }
+       leaf client-id-ref {
+         type te-global-id;
+         description
+           "A reference to a client-id.";
+       }
+       leaf te-topology-id-ref {
+         type tet:te-topology-id;
+         description
+           "A reference to a te-topology-id.";
+       }
+       leaf network-id-ref {
+         type nw:network-id;
+         description
+           "A reference to a network-id in base ietf-network module.";
+       }
+     } // te-topology-ref
+
+     grouping te-topology-type {
+       description
+         "Identifies the TE topology type.";
+       container te-topology {
+         presence "Indicates TE topology.";
+         description
+           "Its presence identifies the TE topology type.";
+       }
+     } // te-topology-type
+
+     grouping template-attributes {
+       description
+         "Common attributes for all templates.";
+
+       leaf priority {
+         type uint16;
+         description
+           "The preference value to resolve conflicts between different
+            templates. When two or more templates specify values for
+            one configuration attribute, the value from the template
+            with the highest priority is used.";
+       }
+       leaf reference-change-policy {
+         type enumeration {
+           enum no-action {
+             description
+               "When an attribute changes in this template, the
+                configuration node referring to this template does
+                not take any action.";
+           }
+           enum not-allowed {
+             description
+               "When any configuration object has a reference to this
+                template, changing this template is not allowed.";
+           }
+           enum cascade {
+             description
+               "When an attribute changes in this template, the
+                configuration object referring to this template applies
+                the new attribute value to the corresponding
+                configuration.";
+           }
+         }
+         description
+           "This attribute specifies the action taken to a configuration
+            node that has a reference to this template.";
+       }
+     } // template-attributes
+
+     /*
+      * Configuration data nodes
+      */
+     augment "/nw:networks/nw:network/nw:network-types" {
+       description
+         "Introduce new network type for TE topology.";
+       uses te-topology-type;
+     }
+
+     augment "/nw:networks" {
+       description
+         "Augmentation parameters for TE topologies.";
+       uses te-topologies-augment;
+     }
+
+     augment "/nw:networks/nw:network" {
+       when "nw:network-types/te-topology" {
+         description
+           "Augmentation parameters apply only for networks with
+            TE topology type.";
+       }
+       description
+         "Configuration parameters for TE topology.";
+       uses te-topology-augment;
+     }
+
+     augment "/nw:networks/nw:network/nw:node" {
+       when "../nw:network-types/te-topology" {
+         description
+           "Augmentation parameters apply only for networks with
+            TE topology type.";
+       }
+       description
+         "Configuration parameters for TE at node level.";
+       uses te-node-augment;
+     }
+
+     augment "/nw:networks/nw:network/nt:link" {
+       when "../nw:network-types/te-topology" {
+         description
+           "Augmentation parameters apply only for networks with
+            TE topology type.";
+       }
+       description
+         "Configuration parameters for TE at link level";
+       uses te-link-augment;
+     }
+
+     augment "/nw:networks/nw:network/nw:node/"
+           + "nt:termination-point" {
+       when "../../nw:network-types/te-topology" {
+         description
+           "Augmentation parameters apply only for networks with
+            TE topology type.";
+       }
+       description
+         "Configuration parameters for TE at termination point level";
+       uses te-termination-point-augment;
+     }
+
+     /*
+      * Operational state data nodes
+      */
+
+     /*
+      * Notifications
+      */
+     notification te-node-event {
+       description "Notification event for TE node.";
+       leaf event-type {
+         type te-topology-event-type;
+         description "Event type.";
+       }
+       uses nw:node-ref;
+       uses te-topology-type;
+       uses tet:te-node-config-attributes-notification;
+       uses tet:te-node-state-derived-notification;
+     }
+
+     notification te-link-event {
+       description "Notification event for TE link.";
+       leaf event-type {
+         type te-topology-event-type;
+         description "Event type";
+       }
+       uses nt:link-ref;
+       uses te-topology-type;
+       uses tet:te-link-config-attributes;
+       uses tet:te-link-state-derived;
+     }
+
+     augment "/te-link-event/te-link-attributes/underlay" {
+       description "Add state attributes to te-link underlay.";
+       uses te-link-state-underlay-attributes;
+     }
+   }
diff --git a/utils/yangutils/plugin/src/test/resources/interfileietf/ietf-te-types.yang b/utils/yangutils/plugin/src/test/resources/interfileietf/ietf-te-types.yang
new file mode 100644
index 0000000..0962720
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/interfileietf/ietf-te-types.yang
@@ -0,0 +1,853 @@
+   module ietf-te-types {
+
+     namespace "urn:ietf:params:xml:ns:yang:ietf-te-types";
+
+     /* Replace with IANA when assigned */
+     prefix "te-types";
+
+     import ietf-inet-types {
+       prefix inet;
+     }
+
+     organization
+       "IETF Traffic Engineering Architecture and Signaling (TEAS)
+        Working Group";
+
+     contact
+       "WG Web:   <http://tools.ietf.org/wg/teas/>
+        WG List:  <mailto:teas@ietf.org>
+
+        WG Chair: Lou Berger
+                  <mailto:lberger@labn.net>
+
+        WG Chair: Vishnu Pavan Beeram
+                  <mailto:vbeeram@juniper.net>
+
+        Editor:   Tarek Saad
+                  <mailto:tsaad@cisco.com>
+
+        Editor:   Rakesh Gandhi
+                  <mailto:rgandhi@cisco.com>
+
+        Editor:   Vishnu Pavan Beeram
+                  <mailto:vbeeram@juniper.net>
+
+        Editor:   Himanshu Shah
+                  <mailto:hshah@ciena.com>
+
+        Editor:   Xufeng Liu
+                  <mailto:xufeng.liu@ericsson.com>
+
+        Editor:   Xia Chen
+                  <mailto:jescia.chenxia@huawei.com>
+
+        Editor:   Raqib Jones
+                  <mailto:raqib@Brocade.com>
+
+        Editor:   Bin Wen
+                  <mailto:Bin_Wen@cable.comcast.com>";
+
+     description
+       "This module contains a collection of generally
+       useful TE specific YANG data type defintions.";
+
+     revision 2016-03-20 {
+       description "Latest revision of TE generic types";
+       reference "RFC3209";
+     }
+
+     /*identity tunnel-type {
+       description
+         "Base identity from which specific tunnel types are
+         derived.";
+     }
+
+     identity tunnel-p2p {
+       base tunnel-type;
+       description
+         "TE point-to-point tunnel type.";
+     }
+
+     identity tunnel-p2mp {
+       base tunnel-type;
+       description
+         "TE point-to-multipoint tunnel type.";
+     }
+
+     identity state-type {
+       description
+         "Base identity for TE states";
+     }
+
+     identity state-up {
+       base state-type;
+       description
+         "State up";
+     }
+
+     identity state-down {
+       base state-type;
+       description
+         "State down";
+     }
+
+     identity lsp-prot-type {
+       description
+         "Base identity from which LSP protection types are
+         derived.";
+     }
+
+     identity lsp-prot-unprotected {
+       description
+         "LSP protection 'Unprotected'";
+       reference "RFC4872";
+     }
+
+     identity lsp-prot-reroute-extra {
+       description
+         "LSP protection '(Full) Rerouting'";
+       reference "RFC4872";
+     }
+
+     identity lsp-prot-reroute {
+       description
+         "LSP protection 'Rerouting without Extra-Traffic'";
+       reference "RFC4872";
+     }
+
+     identity lsp-prot-1-for-n {
+       description
+         "LSP protection '1:N Protection with Extra-Traffic'";
+       reference "RFC4872";
+     }
+
+     identity lsp-prot-unidir-1-to-1 {
+       description
+         "LSP protection '1+1 Unidirectional Protection'";
+       reference "RFC4872";
+     }
+
+     identity lsp-prot-bidir-1-to-1 {
+       description
+         "LSP protection '1+1 Bidirectional Protection'";
+       reference "RFC4872";
+     }
+
+     identity switching-capabilities {
+       description
+         "Base identity for interface switching capabilities";
+     }
+
+     identity switching-psc1 {
+       base switching-capabilities;
+       description
+         "Packet-Switch Capable-1 (PSC-1)";
+     }
+
+     identity switching-evpl {
+       base switching-capabilities;
+       description
+         "Ethernet Virtual Private Line (EVPL)";
+     }
+
+     identity switching-l2sc {
+       base switching-capabilities;
+       description
+         "Layer-2 Switch Capable (L2SC)";
+     }
+
+     identity switching-tdm {
+       base switching-capabilities;
+       description
+         "Time-Division-Multiplex Capable (TDM)";
+     }
+
+     identity switching-otn {
+       base switching-capabilities;
+       description
+         "OTN-TDM capable";
+     }
+
+     identity switching-dcsc {
+       base switching-capabilities;
+       description
+         "Data Channel Switching Capable (DCSC)";
+     }
+     identity switching-lsc {
+       base switching-capabilities;
+       description
+         "Lambda-Switch Capable (LSC)";
+     }
+
+     identity switching-fsc {
+       base switching-capabilities;
+       description
+         "Fiber-Switch Capable (FSC)";
+     }
+
+     identity lsp-encoding-types {
+       description
+         "Base identity for encoding types";
+     }
+
+     identity lsp-encoding-packet {
+       base lsp-encoding-types;
+       description
+         "Packet LSP encoding";
+     }
+
+     identity lsp-encoding-ethernet {
+       base lsp-encoding-types;
+       description
+         "Ethernet LSP encoding";
+     }
+
+     identity lsp-encoding-pdh {
+       base lsp-encoding-types;
+       description
+         "ANSI/ETSI LSP encoding";
+     }
+
+     identity lsp-encoding-sdh {
+       base lsp-encoding-types;
+       description
+         "SDH ITU-T G.707 / SONET ANSI T1.105 LSP encoding";
+     }
+
+     identity lsp-encoding-digital-wrapper {
+       base lsp-encoding-types;
+       description
+         "Digital Wrapper LSP encoding";
+     }
+
+     identity lsp-encoding-lambda {
+       base lsp-encoding-types;
+       description
+         "Lambda (photonic) LSP encoding";
+     }
+
+     identity lsp-encoding-fiber {
+       base lsp-encoding-types;
+       description
+         "Fiber LSP encoding";
+     }
+
+     identity lsp-encoding-fiber-channel {
+       base lsp-encoding-types;
+       description
+         "FiberChannel LSP encoding";
+     }
+
+     identity lsp-encoding-oduk {
+       base lsp-encoding-types;
+       description
+         "G.709 ODUk (Digital Path)LSP encoding";
+     }
+
+     identity lsp-encoding-optical-channel {
+       base lsp-encoding-types;
+       description
+         "Line (e.g., 8B/10B) LSP encoding";
+     }
+
+     identity lsp-encoding-line {
+       base lsp-encoding-types;
+       description
+         "Line (e.g., 8B/10B) LSP encoding";
+     }*/
+
+     /* TE basic features */
+     /*feature p2mp-te {
+       description
+         "Indicates support for P2MP-TE";
+     }
+
+     feature frr-te {
+       description
+         "Indicates support for TE FastReroute (FRR)";
+     }
+
+     feature extended-admin-groups {
+       description
+         "Indicates support for TE link extended admin
+         groups.";
+     }
+
+     feature named-path-affinities {
+       description
+         "Indicates support for named path affinities";
+     }
+
+     feature named-extended-admin-groups {
+       description
+         "Indicates support for named extended admin groups";
+     }
+
+     feature named-srlg-groups {
+       description
+         "Indicates support for named SRLG groups";
+     }
+
+     feature named-path-constraints {
+       description
+         "Indicates support for named path constraints";
+     }*/
+
+     grouping explicit-route-subobject {
+       description
+         "The explicit route subobject grouping";
+       choice type {
+         description
+           "The explicit route subobject type";
+         case ipv4-address {
+           description
+             "IPv4 address explicit route subobject";
+           leaf v4-address {
+             type inet:ipv4-address;
+             description
+               "An IPv4 address.  This address is
+               treated as a prefix based on the
+               prefix length value below. Bits beyond
+               the prefix are ignored on receipt and
+               SHOULD be set to zero on transmission.";
+           }
+           leaf v4-prefix-length {
+             type uint8;
+             description
+               "Length in bits of the IPv4 prefix";
+           }
+           leaf v4-loose {
+             type boolean;
+             description
+               "Describes whether the object is loose
+               if set, or otherwise strict";
+           }
+         }
+         case ipv6-address {
+           description
+             "IPv6 address Explicit Route Object";
+           leaf v6-address {
+             type inet:ipv6-address;
+             description
+               "An IPv6 address.  This address is
+               treated as a prefix based on the
+               prefix length value below.  Bits
+               beyond the prefix are ignored on
+               receipt and SHOULD be set to zero
+               on transmission.";
+           }
+           leaf v6-prefix-length {
+             type uint8;
+             description
+               "Length in bits of the IPv4 prefix";
+           }
+           leaf v6-loose {
+             type boolean;
+             description
+               "Describes whether the object is loose
+               if set, or otherwise strict";
+           }
+         }
+         case as-number {
+           leaf as-number {
+             type uint16;
+             description "AS number";
+           }
+           description
+             "Autonomous System explicit route subobject";
+         }
+         case unnumbered-link {
+           leaf router-id {
+             type inet:ip-address;
+             description
+               "A router-id address";
+           }
+           leaf interface-id {
+             type uint32;
+             description "The interface identifier";
+           }
+           description
+             "Unnumbered link explicit route subobject";
+           reference
+             "RFC3477: Signalling Unnumbered Links in
+             RSVP-TE";
+         }
+         case label {
+           leaf value {
+             type uint32;
+             description "the label value";
+           }
+           description
+             "The Label ERO subobject";
+         }
+         /* AS domain sequence..? */
+       }
+     }
+
+     grouping record-route-subobject {
+       description
+         "The record route subobject grouping";
+       choice type {
+         description
+           "The record route subobject type";
+         case ipv4-address {
+           leaf v4-address {
+             type inet:ipv4-address;
+             description
+               "An IPv4 address.  This address is
+               treated as a prefix based on the prefix
+               length value below. Bits beyond the
+               prefix are ignored on receipt and
+               SHOULD be set to zero on transmission.";
+           }
+           leaf v4-prefix-length {
+             type uint8;
+             description
+               "Length in bits of the IPv4 prefix";
+           }
+           leaf v4-flags {
+             type uint8;
+             description
+               "IPv4 address sub-object flags";
+             reference "RFC3209";
+           }
+         }
+         case ipv6-address {
+           leaf v6-address {
+             type inet:ipv6-address;
+             description
+               "An IPv6 address.  This address is
+               treated as a prefix based on the
+               prefix length value below. Bits
+               beyond the prefix are ignored on
+               receipt and SHOULD be set to zero
+               on transmission.";
+           }
+           leaf v6-prefix-length {
+             type uint8;
+             description
+               "Length in bits of the IPv4 prefix";
+           }
+           leaf v6-flags {
+             type uint8;
+             description
+               "IPv6 address sub-object flags";
+             reference "RFC3209";
+           }
+         }
+         case label {
+           leaf value {
+             type uint32;
+             description "the label value";
+           }
+           leaf flags {
+             type uint8;
+             description
+               "Label sub-object flags";
+             reference "RFC3209";
+           }
+           description
+             "The Label ERO subobject";
+         }
+       }
+     }
+
+     /*identity route-usage-type {
+       description
+         "Base identity for route usage";
+     }
+
+     identity route-include-ero {
+       base route-usage-type;
+       description
+         "Include ERO from route";
+     }
+
+     identity route-exclude-ero {
+       base route-usage-type;
+       description
+         "Exclude ERO from route";
+     }
+
+     identity route-exclude-srlg {
+       base route-usage-type;
+       description
+         "Exclude SRLG from route";
+     }
+
+     identity path-metric-type {
+       description
+         "Base identity for path metric type";
+     }
+
+     identity path-metric-te {
+       base path-metric-type;
+       description
+         "TE path metric";
+     }
+
+     identity path-metric-igp {
+       base path-metric-type;
+       description
+         "IGP path metric";
+     }
+
+     identity path-tiebreaker-type {
+       description
+         "Base identity for path tie-breaker type";
+     }
+
+     identity path-tiebreaker-minfill {
+       base path-tiebreaker-type;
+       description
+         "Min-Fill LSP path placement";
+     }
+
+     identity path-tiebreaker-maxfill {
+       base path-tiebreaker-type;
+       description
+         "Max-Fill LSP path placement";
+     }
+
+     identity path-tiebreaker-randoom {
+       base path-tiebreaker-type;
+       description
+         "Random LSP path placement";
+     }
+
+     identity bidir-provisioning-mode {
+       description
+         "Base identity for bidirectional provisioning
+         mode.";
+     }
+
+     identity bidir-provisioning-single-sided {
+       base bidir-provisioning-mode;
+       description
+         "Single-sided bidirectional provioning mode";
+     }
+
+     identity bidir-provisioning-double-sided {
+       base bidir-provisioning-mode;
+       description
+         "Double-sided bidirectional provioning mode";
+     }
+
+     identity bidir-association-type {
+       description
+         "Base identity for bidirectional association type";
+     }
+
+     identity bidir-assoc-corouted {
+       base bidir-association-type;
+       description
+         "Co-routed bidirectional association type";
+     }
+
+     identity bidir-assoc-non-corouted {
+       base bidir-association-type;
+       description
+         "Non co-routed bidirectional association type";
+     }
+
+     identity resource-affinities-type {
+       description
+         "Base identity for resource affinities";
+     }
+
+     identity resource-aff-include-all {
+       base resource-affinities-type;
+       description
+         "The set of attribute filters associated with a
+         tunnel all of which must be present for a link
+         to be acceptable";
+     }
+
+     identity resource-aff-include-any {
+       base resource-affinities-type;
+       description
+         "The set of attribute filters associated with a
+         tunnel any of which must be present for a link
+         to be acceptable";
+     }
+
+     identity resource-aff-exclude-any {
+       base resource-affinities-type;
+       description
+         "The set of attribute filters associated with a
+         tunnel any of which renders a link unacceptable";
+     }*/
+
+     typedef admin-group {
+       type binary {
+//         length 32;
+       }
+       description
+         "Administrative group/Resource class/Color.";
+     }
+
+     typedef extended-admin-group {
+       type binary;
+       description
+         "Extended administrative group/Resource class/Color.";
+     }
+
+     typedef admin-groups {
+       type union {
+         type admin-group;
+         type extended-admin-group;
+       }
+       description "TE administrative group derived type";
+     }
+
+     typedef srlg {
+       type uint32;
+       description "SRLG type";
+     }
+
+     /*identity path-computation-srlg-type {
+       description
+         "Base identity for SRLG path computation";
+     }
+
+     identity srlg-ignore {
+       base path-computation-srlg-type;
+       description
+         "Ignores SRLGs in path computation";
+     }
+
+     identity srlg-strict {
+       base path-computation-srlg-type;
+       description
+         "Include strict SRLG check in path computation";
+     }
+
+     identity srlg-preferred {
+       base path-computation-srlg-type;
+       description
+         "Include preferred SRLG check in path computation";
+     }
+
+     identity srlg-weighted {
+       base path-computation-srlg-type;
+       description
+         "Include weighted SRLG check in path computation";
+     }*/
+
+     typedef te-metric {
+       type uint32;
+       description
+         "TE link metric";
+     }
+
+     typedef topology-id {
+       type string {
+         pattern '/?([a-zA-Z0-9\-_.]+)(/[a-zA-Z0-9\-_.]+)*';
+       }
+       description
+         "An identifier for a topology.";
+     }
+
+     /**
+      * TE tunnel generic groupings
+      **/
+
+     /* Tunnel path selection parameters */
+     grouping tunnel-path-selection {
+       description
+         "Tunnel path selection properties grouping";
+       container path-selection {
+         description
+           "Tunnel path selection properties container";
+         leaf topology {
+           type te-types:topology-id;
+           description
+             "The tunnel path is computed using the specific
+             topology identified by this identifier";
+         }
+         leaf cost-limit {
+           type uint32 {
+             range "1..4294967295";
+           }
+           description
+             "The tunnel path cost limit.";
+         }
+         leaf hop-limit {
+           type uint8 {
+             range "1..255";
+           }
+           description
+             "The tunnel path hop limit.";
+         }
+         leaf metric-type {
+           type string;
+           description
+             "The tunnel path metric type.";
+         }
+         leaf tiebreaker-type {
+           type string;
+           description
+             "The tunnel path computation tie breakers.";
+         }
+         leaf ignore-overload {
+           type boolean;
+           description
+             "The tunnel path can traverse overloaded node.";
+         }
+         uses tunnel-path-affinities;
+         uses tunnel-path-srlgs;
+       }
+     }
+
+     grouping tunnel-path-affinities {
+       description
+         "Path affinities grouping";
+       container tunnel-path-affinities {
+         if-feature named-path-affinities;
+         description
+           "Path affinities container";
+         choice style {
+           description
+             "Path affinities representation style";
+           case values {
+             leaf value {
+               type uint32 {
+                 range "0..4294967295";
+               }
+               description
+                 "Affinity value";
+             }
+             leaf mask {
+               type uint32 {
+                 range "0..4294967295";
+               }
+               description
+                 "Affinity mask";
+             }
+           }
+           case named {
+             list constraints {
+               key "usage";
+               leaf usage {
+                 type string;
+                 description "Affinities usage";
+               }
+               container constraint {
+                 description
+                   "Container for named affinities";
+                 list affinity-names {
+                   key "name";
+                   leaf name {
+                     type string;
+                     description
+                       "Affinity name";
+                   }
+                   description
+                     "List of named affinities";
+                 }
+               }
+               description
+                 "List of named affinity constraints";
+             }
+           }
+         }
+       }
+     }
+
+     grouping tunnel-path-srlgs {
+       description
+         "Path SRLG properties grouping";
+       container tunnel-path-srlgs {
+         description
+           "Path SRLG properties container";
+         choice style {
+           description
+             "Type of SRLG representation";
+           case values {
+             leaf usage {
+               type string;
+               description "SRLG usage";
+             }
+             leaf-list values {
+               type te-types:srlg;
+               description "SRLG value";
+             }
+           }
+           case named {
+             list constraints {
+               key "usage";
+               leaf usage {
+                 type string;
+                 description "SRLG usage";
+               }
+               container constraint {
+                 description
+                   "Container for named SRLG list";
+                 list srlg-names {
+                   key "name";
+                   leaf name {
+                     type string;
+                     description
+                       "The SRLG name";
+                   }
+                   description
+                     "List named SRLGs";
+                 }
+               }
+               description
+                 "List of named SRLG constraints";
+             }
+           }
+         }
+       }
+     }
+
+     grouping tunnel-bidir-assoc-properties {
+       description
+         "TE tunnel associated bidirectional properties
+         grouping";
+       container bidirectional {
+         description
+           "TE tunnel associated bidirectional attributes.";
+         container association {
+           description
+             "Tunnel bidirectional association properties";
+           leaf id {
+             type uint16;
+             description
+               "The TE tunnel association identifier.";
+           }
+           leaf source {
+             type inet:ip-address;
+             description
+               "The TE tunnel association source.";
+           }
+           leaf global-source {
+             type inet:ip-address;
+             description
+               "The TE tunnel association global
+               source.";
+           }
+           leaf type {
+             type string;
+             description
+               "The TE tunnel association type.";
+           }
+           leaf provisioing {
+             type string;
+             description
+               "Describes the provisioning model of the
+               associated bidirectional LSP";
+             reference
+               "draft-ietf-teas-mpls-tp-rsvpte-ext-
+               associated-lsp, section-3.2";
+           }
+         }
+       }
+     }
+     /*** End of TE tunnel groupings ***/
+
+     /**
+      * TE interface generic groupings
+      **/
+   }
diff --git a/utils/yangutils/plugin/src/test/resources/interfileietf/ietf-yang-types.yang b/utils/yangutils/plugin/src/test/resources/interfileietf/ietf-yang-types.yang
new file mode 100644
index 0000000..9a543fa
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/interfileietf/ietf-yang-types.yang
@@ -0,0 +1,490 @@
+  module ietf-yang-types {
+
+    yang-version 1;
+
+    namespace
+      "urn:ietf:params:xml:ns:yang:ietf-yang-types";
+
+    prefix yang;
+
+    organization
+      "IETF NETMOD (NETCONF Data Modeling Language) Working Group";
+
+    contact
+      "WG Web:   <http://tools.ietf.org/wg/netmod/>
+    WG List:  <mailto:netmod@ietf.org>
+
+    WG Chair: David Kessens
+              <mailto:david.kessens@nsn.com>
+
+    WG Chair: Juergen Schoenwaelder
+              <mailto:j.schoenwaelder@jacobs-university.de>
+
+    Editor:   Juergen Schoenwaelder
+              <mailto:j.schoenwaelder@jacobs-university.de>";
+
+    description
+      "This module contains a collection of generally useful derived
+    YANG data types.
+
+    Copyright (c) 2013 IETF Trust and the persons identified as
+    authors of the code.  All rights reserved.
+
+    Redistribution and use in source and binary forms, with or
+    without modification, is permitted pursuant to, and subject
+    to the license terms contained in, the Simplified BSD License
+    set forth in Section 4.c of the IETF Trust's Legal Provisions
+    Relating to IETF Documents
+    (http://trustee.ietf.org/license-info).
+
+    This version of this YANG module is part of RFC 6991; see
+    the RFC itself for full legal notices.";
+
+    revision "2013-07-15" {
+      description
+        "This revision adds the following new data types:
+      - yang-identifier
+      - hex-string
+      - uuid
+      - dotted-quad";
+      reference
+        "RFC 6991: Common YANG Data Types";
+
+    }
+
+    revision "2010-09-24" {
+      description "Initial revision.";
+      reference
+        "RFC 6021: Common YANG Data Types";
+
+    }
+
+
+    typedef counter32 {
+      type uint32;
+      description
+        "The counter32 type represents a non-negative integer
+      that monotonically increases until it reaches a
+      maximum value of 2^32-1 (4294967295 decimal), when it
+      wraps around and starts increasing again from zero.
+
+      Counters have no defined 'initial' value, and thus, a
+      single value of a counter has (in general) no information
+      content.  Discontinuities in the monotonically increasing
+      value normally occur at re-initialization of the
+      management system, and at other times as specified in the
+      description of a schema node using this type.  If such
+      other times can occur, for example, the creation of
+      a schema node of type counter32 at times other than
+      re-initialization, then a corresponding schema node
+      should be defined, with an appropriate type, to indicate
+      the last discontinuity.
+
+      The counter32 type should not be used for configuration
+      schema nodes.  A default statement SHOULD NOT be used in
+      combination with the type counter32.
+
+      In the value set and its semantics, this type is equivalent
+      to the Counter32 type of the SMIv2.";
+      reference
+        "RFC 2578: Structure of Management Information Version 2
+        	  (SMIv2)";
+
+    }
+
+    typedef zero-based-counter32 {
+      type counter32;
+      default "0";
+      description
+        "The zero-based-counter32 type represents a counter32
+      that has the defined 'initial' value zero.
+
+      A schema node of this type will be set to zero (0) on creation
+      and will thereafter increase monotonically until it reaches
+      a maximum value of 2^32-1 (4294967295 decimal), when it
+      wraps around and starts increasing again from zero.
+
+      Provided that an application discovers a new schema node
+      of this type within the minimum time to wrap, it can use the
+      'initial' value as a delta.  It is important for a management
+      station to be aware of this minimum time and the actual time
+      between polls, and to discard data if the actual time is too
+      long or there is no defined minimum time.
+
+      In the value set and its semantics, this type is equivalent
+      to the ZeroBasedCounter32 textual convention of the SMIv2.";
+      reference
+        "RFC 4502: Remote Network Monitoring Management Information
+        	  Base Version 2";
+
+    }
+
+    typedef counter64 {
+      type uint64;
+      description
+        "The counter64 type represents a non-negative integer
+      that monotonically increases until it reaches a
+      maximum value of 2^64-1 (18446744073709551615 decimal),
+      when it wraps around and starts increasing again from zero.
+
+      Counters have no defined 'initial' value, and thus, a
+      single value of a counter has (in general) no information
+      content.  Discontinuities in the monotonically increasing
+      value normally occur at re-initialization of the
+      management system, and at other times as specified in the
+      description of a schema node using this type.  If such
+      other times can occur, for example, the creation of
+      a schema node of type counter64 at times other than
+      re-initialization, then a corresponding schema node
+      should be defined, with an appropriate type, to indicate
+      the last discontinuity.
+
+      The counter64 type should not be used for configuration
+      schema nodes.  A default statement SHOULD NOT be used in
+      combination with the type counter64.
+
+      In the value set and its semantics, this type is equivalent
+      to the Counter64 type of the SMIv2.";
+      reference
+        "RFC 2578: Structure of Management Information Version 2
+        	  (SMIv2)";
+
+    }
+
+    typedef zero-based-counter64 {
+      type counter64;
+      default "0";
+      description
+        "The zero-based-counter64 type represents a counter64 that
+      has the defined 'initial' value zero.
+
+
+
+
+      A schema node of this type will be set to zero (0) on creation
+      and will thereafter increase monotonically until it reaches
+      a maximum value of 2^64-1 (18446744073709551615 decimal),
+      when it wraps around and starts increasing again from zero.
+
+      Provided that an application discovers a new schema node
+      of this type within the minimum time to wrap, it can use the
+      'initial' value as a delta.  It is important for a management
+      station to be aware of this minimum time and the actual time
+      between polls, and to discard data if the actual time is too
+      long or there is no defined minimum time.
+
+      In the value set and its semantics, this type is equivalent
+      to the ZeroBasedCounter64 textual convention of the SMIv2.";
+      reference
+        "RFC 2856: Textual Conventions for Additional High Capacity
+        	  Data Types";
+
+    }
+
+    typedef gauge32 {
+      type uint32;
+      description
+        "The gauge32 type represents a non-negative integer, which
+      may increase or decrease, but shall never exceed a maximum
+      value, nor fall below a minimum value.  The maximum value
+      cannot be greater than 2^32-1 (4294967295 decimal), and
+      the minimum value cannot be smaller than 0.  The value of
+      a gauge32 has its maximum value whenever the information
+      being modeled is greater than or equal to its maximum
+      value, and has its minimum value whenever the information
+      being modeled is smaller than or equal to its minimum value.
+      If the information being modeled subsequently decreases
+      below (increases above) the maximum (minimum) value, the
+      gauge32 also decreases (increases).
+
+      In the value set and its semantics, this type is equivalent
+      to the Gauge32 type of the SMIv2.";
+      reference
+        "RFC 2578: Structure of Management Information Version 2
+        	  (SMIv2)";
+
+    }
+
+    typedef gauge64 {
+      type uint64;
+      description
+        "The gauge64 type represents a non-negative integer, which
+      may increase or decrease, but shall never exceed a maximum
+      value, nor fall below a minimum value.  The maximum value
+      cannot be greater than 2^64-1 (18446744073709551615), and
+      the minimum value cannot be smaller than 0.  The value of
+      a gauge64 has its maximum value whenever the information
+      being modeled is greater than or equal to its maximum
+      value, and has its minimum value whenever the information
+      being modeled is smaller than or equal to its minimum value.
+      If the information being modeled subsequently decreases
+      below (increases above) the maximum (minimum) value, the
+      gauge64 also decreases (increases).
+
+      In the value set and its semantics, this type is equivalent
+      to the CounterBasedGauge64 SMIv2 textual convention defined
+      in RFC 2856";
+      reference
+        "RFC 2856: Textual Conventions for Additional High Capacity
+        	  Data Types";
+
+    }
+
+    typedef object-identifier {
+      type string {
+        pattern
+          '(([0-1](\.[1-3]?[0-9]))|(2\.(0|([1-9]\d*))))(\.(0|([1-9]\d*)))*';
+      }
+      description
+        "The object-identifier type represents administratively
+      assigned names in a registration-hierarchical-name tree.
+
+      Values of this type are denoted as a sequence of numerical
+      non-negative sub-identifier values.  Each sub-identifier
+      value MUST NOT exceed 2^32-1 (4294967295).  Sub-identifiers
+      are separated by single dots and without any intermediate
+      whitespace.
+
+      The ASN.1 standard restricts the value space of the first
+      sub-identifier to 0, 1, or 2.  Furthermore, the value space
+      of the second sub-identifier is restricted to the range
+      0 to 39 if the first sub-identifier is 0 or 1.  Finally,
+      the ASN.1 standard requires that an object identifier
+      has always at least two sub-identifiers.  The pattern
+      captures these restrictions.
+
+      Although the number of sub-identifiers is not limited,
+      module designers should realize that there may be
+      implementations that stick with the SMIv2 limit of 128
+      sub-identifiers.
+
+      This type is a superset of the SMIv2 OBJECT IDENTIFIER type
+      since it is not restricted to 128 sub-identifiers.  Hence,
+      this type SHOULD NOT be used to represent the SMIv2 OBJECT
+      IDENTIFIER type; the object-identifier-128 type SHOULD be
+      used instead.";
+      reference
+        "ISO9834-1: Information technology -- Open Systems
+        Interconnection -- Procedures for the operation of OSI
+        Registration Authorities: General procedures and top
+        arcs of the ASN.1 Object Identifier tree";
+
+    }
+
+    typedef object-identifier-128 {
+      type object-identifier {
+        pattern '\d*(\.\d*){1,127}';
+      }
+      description
+        "This type represents object-identifiers restricted to 128
+      sub-identifiers.
+
+      In the value set and its semantics, this type is equivalent
+      to the OBJECT IDENTIFIER type of the SMIv2.";
+      reference
+        "RFC 2578: Structure of Management Information Version 2
+        	  (SMIv2)";
+
+    }
+
+    typedef yang-identifier {
+      type string {
+        length "1..max";
+        pattern '[a-zA-Z_][a-zA-Z0-9\-_.]*';
+        pattern
+          '.|..|[^xX].*|.[^mM].*|..[^lL].*';
+      }
+      description
+        "A YANG identifier string as defined by the 'identifier'
+       rule in Section 12 of RFC 6020.  An identifier must
+       start with an alphabetic character or an underscore
+       followed by an arbitrary sequence of alphabetic or
+       numeric characters, underscores, hyphens, or dots.
+
+       A YANG identifier MUST NOT start with any possible
+       combination of the lowercase or uppercase character
+       sequence 'xml'.";
+      reference
+        "RFC 6020: YANG - A Data Modeling Language for the Network
+        	  Configuration Protocol (NETCONF)";
+
+    }
+
+    typedef date-and-time {
+      type string {
+        pattern
+          '\d{4}-\d{2}-\d{2}T\d{2}:\d{2}:\d{2}(\.\d+)?(Z|[\+\-]\d{2}:\d{2})';
+      }
+      description
+        "The date-and-time type is a profile of the ISO 8601
+      standard for representation of dates and times using the
+      Gregorian calendar.  The profile is defined by the
+      date-time production in Section 5.6 of RFC 3339.
+
+      The date-and-time type is compatible with the dateTime XML
+      schema type with the following notable exceptions:
+
+      (a) The date-and-time type does not allow negative years.
+
+      (b) The date-and-time time-offset -00:00 indicates an unknown
+          time zone (see RFC 3339) while -00:00 and +00:00 and Z
+          all represent the same time zone in dateTime.
+
+      (c) The canonical format (see below) of data-and-time values
+          differs from the canonical format used by the dateTime XML
+          schema type, which requires all times to be in UTC using
+          the time-offset 'Z'.
+
+      This type is not equivalent to the DateAndTime textual
+      convention of the SMIv2 since RFC 3339 uses a different
+      separator between full-date and full-time and provides
+      higher resolution of time-secfrac.
+
+      The canonical format for date-and-time values with a known time
+      zone uses a numeric time zone offset that is calculated using
+      the device's configured known offset to UTC time.  A change of
+      the device's offset to UTC time will cause date-and-time values
+      to change accordingly.  Such changes might happen periodically
+      in case a server follows automatically daylight saving time
+      (DST) time zone offset changes.  The canonical format for
+      date-and-time values with an unknown time zone (usually
+      referring to the notion of local time) uses the time-offset
+      -00:00.";
+      reference
+        "RFC 3339: Date and Time on the Internet: Timestamps
+         RFC 2579: Textual Conventions for SMIv2
+        XSD-TYPES: XML Schema Part 2: Datatypes Second Edition";
+
+    }
+
+    typedef timeticks {
+      type uint32;
+      description
+        "The timeticks type represents a non-negative integer that
+      represents the time, modulo 2^32 (4294967296 decimal), in
+      hundredths of a second between two epochs.  When a schema
+      node is defined that uses this type, the description of
+      the schema node identifies both of the reference epochs.
+
+      In the value set and its semantics, this type is equivalent
+      to the TimeTicks type of the SMIv2.";
+      reference
+        "RFC 2578: Structure of Management Information Version 2
+        	  (SMIv2)";
+
+    }
+
+    typedef timestamp {
+      type timeticks;
+      description
+        "The timestamp type represents the value of an associated
+      timeticks schema node at which a specific occurrence
+      happened.  The specific occurrence must be defined in the
+      description of any schema node defined using this type.  When
+      the specific occurrence occurred prior to the last time the
+      associated timeticks attribute was zero, then the timestamp
+      value is zero.  Note that this requires all timestamp values
+      to be reset to zero when the value of the associated timeticks
+      attribute reaches 497+ days and wraps around to zero.
+
+      The associated timeticks schema node must be specified
+      in the description of any schema node using this type.
+
+      In the value set and its semantics, this type is equivalent
+      to the TimeStamp textual convention of the SMIv2.";
+      reference
+        "RFC 2579: Textual Conventions for SMIv2";
+
+    }
+
+    typedef phys-address {
+      type string {
+        pattern
+          '([0-9a-fA-F]{2}(:[0-9a-fA-F]{2})*)?';
+      }
+      description
+        "Represents media- or physical-level addresses represented
+      as a sequence octets, each octet represented by two hexadecimal
+      numbers.  Octets are separated by colons.  The canonical
+      representation uses lowercase characters.
+
+      In the value set and its semantics, this type is equivalent
+      to the PhysAddress textual convention of the SMIv2.";
+      reference
+        "RFC 2579: Textual Conventions for SMIv2";
+
+    }
+
+    typedef mac-address {
+      type string {
+        pattern
+          '[0-9a-fA-F]{2}(:[0-9a-fA-F]{2}){5}';
+      }
+      description
+        "The mac-address type represents an IEEE 802 MAC address.
+      The canonical representation uses lowercase characters.
+
+      In the value set and its semantics, this type is equivalent
+      to the MacAddress textual convention of the SMIv2.";
+      reference
+        "IEEE 802: IEEE Standard for Local and Metropolitan Area
+        	  Networks: Overview and Architecture
+         RFC 2579: Textual Conventions for SMIv2";
+
+    }
+
+    typedef xpath1.0 {
+      type string;
+      description
+        "This type represents an XPATH 1.0 expression.
+
+      When a schema node is defined that uses this type, the
+      description of the schema node MUST specify the XPath
+      context in which the XPath expression is evaluated.";
+      reference
+        "XPATH: XML Path Language (XPath) Version 1.0";
+
+    }
+
+    typedef hex-string {
+      type string {
+        pattern
+          '([0-9a-fA-F]{2}(:[0-9a-fA-F]{2})*)?';
+      }
+      description
+        "A hexadecimal string with octets represented as hex digits
+      separated by colons.  The canonical representation uses
+      lowercase characters.";
+    }
+
+    typedef uuid {
+      type string {
+        pattern
+          '[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{12}';
+      }
+      description
+        "A Universally Unique IDentifier in the string representation
+      defined in RFC 4122.  The canonical representation uses
+      lowercase characters.
+
+      The following is an example of a UUID in string representation:
+      f81d4fae-7dec-11d0-a765-00a0c91e6bf6
+      ";
+      reference
+        "RFC 4122: A Universally Unique IDentifier (UUID) URN
+        	  Namespace";
+
+    }
+
+    typedef dotted-quad {
+      type string {
+        pattern
+          '(([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])\.){3}([0-9]|[1-9][0-9]|1[0-9][0-9]|2[0-4][0-9]|25[0-5])';
+      }
+      description
+        "An unsigned 32-bit number expressed in the dotted-quad
+       notation, i.e., four octets written as decimal numbers
+       and separated with the '.' (full stop) character.";
+    }
+  }  // module ietf-yang-types
+
diff --git a/utils/yangutils/plugin/src/test/resources/interfiletype/module1.yang b/utils/yangutils/plugin/src/test/resources/interfiletype/module1.yang
new file mode 100644
index 0000000..3c60bd6
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/interfiletype/module1.yang
@@ -0,0 +1,14 @@
+module module1 {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    import module2 {
+        prefix p;
+    }
+    leaf invalid-interval {
+        type p:hello;
+    }
+    typedef hello {
+        type string;
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/interfiletype/module2.yang b/utils/yangutils/plugin/src/test/resources/interfiletype/module2.yang
new file mode 100644
index 0000000..6784c45
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/interfiletype/module2.yang
@@ -0,0 +1,8 @@
+module module2 {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant2;
+    typedef hello {
+        type string;
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/interfiletypewithinclude/module1.yang b/utils/yangutils/plugin/src/test/resources/interfiletypewithinclude/module1.yang
new file mode 100644
index 0000000..d1d4db3
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/interfiletypewithinclude/module1.yang
@@ -0,0 +1,9 @@
+module module1 {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    include module2;
+    leaf invalid-interval {
+        type hello;
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/interfiletypewithinclude/module2.yang b/utils/yangutils/plugin/src/test/resources/interfiletypewithinclude/module2.yang
new file mode 100644
index 0000000..8e47100
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/interfiletypewithinclude/module2.yang
@@ -0,0 +1,9 @@
+submodule module2 {
+    yang-version 1;
+    belongs-to module1 {
+        prefix "module1";
+    }
+    typedef hello {
+        type string;
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/interfiletypewithrevision/module1.yang b/utils/yangutils/plugin/src/test/resources/interfiletypewithrevision/module1.yang
new file mode 100644
index 0000000..180511d
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/interfiletypewithrevision/module1.yang
@@ -0,0 +1,15 @@
+module module1 {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    import module2 {
+        prefix p;
+        revision-date 2007-06-09;
+    }
+    leaf invalid-interval {
+        type p:hello;
+    }
+    typedef hello {
+        type string;
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/interfiletypewithrevision/module2.yang b/utils/yangutils/plugin/src/test/resources/interfiletypewithrevision/module2.yang
new file mode 100644
index 0000000..fd99872
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/interfiletypewithrevision/module2.yang
@@ -0,0 +1,11 @@
+module module2 {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant2;
+    revision 2007-06-09 {
+        description "Initial revision.";
+    }
+    typedef hello {
+        type string;
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/interfiletypewithrevisioninname/module1.yang b/utils/yangutils/plugin/src/test/resources/interfiletypewithrevisioninname/module1.yang
new file mode 100644
index 0000000..180511d
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/interfiletypewithrevisioninname/module1.yang
@@ -0,0 +1,15 @@
+module module1 {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    import module2 {
+        prefix p;
+        revision-date 2007-06-09;
+    }
+    leaf invalid-interval {
+        type p:hello;
+    }
+    typedef hello {
+        type string;
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/interfiletypewithrevisioninname/module2@2007-06-09.yang b/utils/yangutils/plugin/src/test/resources/interfiletypewithrevisioninname/module2@2007-06-09.yang
new file mode 100644
index 0000000..fd99872
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/interfiletypewithrevisioninname/module2@2007-06-09.yang
@@ -0,0 +1,11 @@
+module module2 {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant2;
+    revision 2007-06-09 {
+        description "Initial revision.";
+    }
+    typedef hello {
+        type string;
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/interfileuses/module1.yang b/utils/yangutils/plugin/src/test/resources/interfileuses/module1.yang
new file mode 100644
index 0000000..69df326
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/interfileuses/module1.yang
@@ -0,0 +1,9 @@
+module module1 {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    import module2 {
+        prefix p;
+    }
+    uses p:hello;
+}
diff --git a/utils/yangutils/plugin/src/test/resources/interfileuses/module2.yang b/utils/yangutils/plugin/src/test/resources/interfileuses/module2.yang
new file mode 100644
index 0000000..5bb3616
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/interfileuses/module2.yang
@@ -0,0 +1,10 @@
+module module2 {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    grouping hello {
+        leaf hello {
+            type string;
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/interfileuseswithinclude/module1.yang b/utils/yangutils/plugin/src/test/resources/interfileuseswithinclude/module1.yang
new file mode 100644
index 0000000..41899d9
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/interfileuseswithinclude/module1.yang
@@ -0,0 +1,7 @@
+module module1 {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    include module2;
+    uses hello;
+}
diff --git a/utils/yangutils/plugin/src/test/resources/interfileuseswithinclude/module2.yang b/utils/yangutils/plugin/src/test/resources/interfileuseswithinclude/module2.yang
new file mode 100644
index 0000000..1b423d9
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/interfileuseswithinclude/module2.yang
@@ -0,0 +1,11 @@
+submodule module2 {
+    yang-version 1;
+    belongs-to module1 {
+        prefix "module1";
+    }
+    grouping hello {
+        leaf hello {
+            type string;
+        }
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/interfilewithusesreferringtype/ietf-network.yang b/utils/yangutils/plugin/src/test/resources/interfilewithusesreferringtype/ietf-network.yang
new file mode 100644
index 0000000..3d96560
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/interfilewithusesreferringtype/ietf-network.yang
@@ -0,0 +1,14 @@
+   module ietf-network {
+     yang-version 1;
+     namespace "urn:ietf:params:xml:ns:yang:ietf-network";
+     prefix nd;
+
+     container networks {
+         container network-types {
+           description
+             "Serves as an augmentation target.
+              The network type is indicated through corresponding
+              presence containers augmented into this container.";
+         }
+     }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/interfilewithusesreferringtype/ietf-te-topology.yang b/utils/yangutils/plugin/src/test/resources/interfilewithusesreferringtype/ietf-te-topology.yang
new file mode 100644
index 0000000..2434403
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/interfilewithusesreferringtype/ietf-te-topology.yang
@@ -0,0 +1,51 @@
+   module ietf-te-topology {
+     yang-version 1;
+     namespace "urn:ietf:params:xml:ns:yang:ietf-te-topology";
+     // replace with IANA namespace when assigned
+
+     prefix "tet";
+
+     import ietf-network {
+       prefix "nw";
+     }
+
+     grouping te-topologies-augment {
+       description
+         "Augmentation for TE topologies.";
+       leaf reference-change-policy {
+         type enumeration {
+           enum no-action {
+             description
+               "When an attribute changes in this template, the
+                configuration node referring to this template does
+                not take any action.";
+           }
+           enum not-allowed {
+             description
+               "When any configuration object has a reference to this
+                template, changing this template is not allowed.";
+           }
+           enum cascade {
+             description
+               "When an attribute changes in this template, the
+                configuration object referring to this template applies
+                the new attribute value to the corresponding
+                configuration.";
+           }
+         }
+         description
+           "This attribute specifies the action taken to a configuration
+            node that has a reference to this template.";
+       }
+     } // te-topologies-augment
+
+
+
+     augment "/nw:networks" {
+       description
+         "Augmentation parameters for TE topologies.";
+       uses te-topologies-augment;
+     }
+
+
+}
diff --git a/utils/yangutils/plugin/src/test/resources/processTypeDef.yang b/utils/yangutils/plugin/src/test/resources/processTypeDef.yang
new file mode 100644
index 0000000..2875752
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/processTypeDef.yang
@@ -0,0 +1,11 @@
+module Test {
+    yang-version 1;
+    namespace http://huawei.com;
+    prefix Ant;
+    typedef hello {
+        type String;
+    }
+    leaf invalid-interval {
+        type hello;
+    }
+}
diff --git a/utils/yangutils/plugin/src/test/resources/usesInContainer/GroupingError.yang b/utils/yangutils/plugin/src/test/resources/usesInContainer/GroupingError.yang
new file mode 100644
index 0000000..8c7c01d
--- /dev/null
+++ b/utils/yangutils/plugin/src/test/resources/usesInContainer/GroupingError.yang
@@ -0,0 +1,64 @@
+
+module ietf-sd-onos-service-types {
+
+       namespace "urn:ietf:params:xml:ns:yang:ietf-sd-onos-service-types";  
+       prefix service-types ; 
+
+	grouping qos-if-car {  
+           description "qos parameter." ;  
+         list qos-if-car {  
+       	key "direction";  
+           description "cars qos policy." ;   
+           leaf direction {  
+               type enumeration {  
+                   enum inbound{  
+                       value 0 ;  
+                       description "inbound." ;  
+                   }  
+                   enum outbound {  
+                       value 1 ;  
+                       description "outbound." ;  
+                   }  
+               }  
+        description "qos for interface car" ;  
+           }   
+}
+}
+
+	container qos-policy {  
+          description "The qos policy of the vpn service." ;  
+               container qos-if-cars {  
+             description "qos policy if car." ;  
+                   list qos-if-car {  
+                     key "direction";  
+                     uses qos-if-car;  
+             description "List of qos parameters." ;  
+                   }  
+               }  
+           }  
+
+     rpc close-l3vpn {  
+     description "Close l3vpn." ;  
+         input {  
+             leaf l3vpn-id {  
+                 type string;  
+           description "vpn id." ;  
+             }  
+             container ac-status {   
+           description "Access status of the vpn." ;  
+                 list acs{  
+                     key "id";  
+             description "Access information." ;  
+                     leaf id {  
+                         type string;  
+               description "Access id." ;  
+                     }  
+                     leaf admin-status {  
+                         type string;  
+               description "Administration status." ;  
+                     }                      
+                 }
+             }  
+         }  
+     }    
+}