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;