[ONOS-4670] Removal of Data Model dependencies on Linker

Change-Id: I3f9c5af30198ea31d743e06cea1764dcb306ec32
diff --git a/src/main/java/org/onosproject/yangutils/datamodel/utils/DataModelUtils.java b/src/main/java/org/onosproject/yangutils/datamodel/utils/DataModelUtils.java
index 29d384b..97c7327 100644
--- a/src/main/java/org/onosproject/yangutils/datamodel/utils/DataModelUtils.java
+++ b/src/main/java/org/onosproject/yangutils/datamodel/utils/DataModelUtils.java
@@ -18,20 +18,18 @@
 
 import java.util.List;
 import java.util.Set;
-
 import org.onosproject.yangutils.datamodel.CollisionDetector;
+import org.onosproject.yangutils.datamodel.ResolvableType;
 import org.onosproject.yangutils.datamodel.YangLeaf;
 import org.onosproject.yangutils.datamodel.YangLeafList;
 import org.onosproject.yangutils.datamodel.YangLeavesHolder;
 import org.onosproject.yangutils.datamodel.YangNode;
+import org.onosproject.yangutils.datamodel.YangReferenceResolver;
+import org.onosproject.yangutils.datamodel.YangResolutionInfo;
 import org.onosproject.yangutils.datamodel.YangRpc;
 import org.onosproject.yangutils.datamodel.YangType;
 import org.onosproject.yangutils.datamodel.exceptions.DataModelException;
-import org.onosproject.yangutils.linker.ResolvableType;
-import org.onosproject.yangutils.linker.YangReferenceResolver;
-import org.onosproject.yangutils.linker.impl.YangResolutionInfo;
 import org.onosproject.yangutils.parser.Parsable;
-import org.onosproject.yangutils.plugin.manager.YangFileInfo;
 import org.onosproject.yangutils.utils.YangConstructType;
 
 /**
@@ -179,7 +177,7 @@
      * @throws DataModelException a violation of data model rules
      */
     public static void resolveLinkingForResolutionList(List<YangResolutionInfo> resolutionList,
-            YangReferenceResolver dataModelRootNode)
+                                                       YangReferenceResolver dataModelRootNode)
             throws DataModelException {
 
         for (YangResolutionInfo resolutionInfo : resolutionList) {
@@ -195,7 +193,7 @@
      * @throws DataModelException a violation of data model rules
      */
     public static void linkInterFileReferences(List<YangResolutionInfo> resolutionList,
-            YangReferenceResolver dataModelRootNode)
+                                               YangReferenceResolver dataModelRootNode)
             throws DataModelException {
         /*
          * Run through the resolution list, find type/uses referring to
@@ -226,19 +224,18 @@
     /**
      * Returns referred node in a given set.
      *
-     * @param yangFileInfoSet YANG file info set
-     * @param refNodeName     name of the node which is referred
+     * @param yangNodeSet YANG node set
+     * @param refNodeName name of the node which is referred
      * @return referred node's reference
      */
-    public static YangNode findReferredNode(Set<YangFileInfo> yangFileInfoSet, String refNodeName) {
+    public static YangNode findReferredNode(Set<YangNode> yangNodeSet, String refNodeName) {
         /*
          * Run through the YANG files to see which YANG file matches the
          * referred node name.
          */
-        for (YangFileInfo yangFileInfo : yangFileInfoSet) {
-            YangNode yangNode = yangFileInfo.getRootNode();
+        for (YangNode yangNode : yangNodeSet) {
             if (yangNode.getName().equals(refNodeName)) {
-                return yangFileInfo.getRootNode();
+                return yangNode;
             }
         }
         return null;
diff --git a/src/main/java/org/onosproject/yangutils/datamodel/utils/RestrictionResolver.java b/src/main/java/org/onosproject/yangutils/datamodel/utils/RestrictionResolver.java
new file mode 100644
index 0000000..4148278
--- /dev/null
+++ b/src/main/java/org/onosproject/yangutils/datamodel/utils/RestrictionResolver.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.datamodel.utils;
+
+import java.util.regex.Pattern;
+import org.onosproject.yangutils.datamodel.YangDataTypes;
+import org.onosproject.yangutils.datamodel.YangRangeInterval;
+import org.onosproject.yangutils.datamodel.YangRangeRestriction;
+import org.onosproject.yangutils.datamodel.exceptions.DataModelException;
+import org.onosproject.yangutils.utils.YangConstructType;
+import org.onosproject.yangutils.datamodel.utils.builtindatatype.YangBuiltInDataTypeInfo;
+
+import static org.onosproject.yangutils.datamodel.YangDataTypes.DECIMAL64;
+import static org.onosproject.yangutils.datamodel.YangDataTypes.INT16;
+import static org.onosproject.yangutils.datamodel.YangDataTypes.INT32;
+import static org.onosproject.yangutils.datamodel.YangDataTypes.INT64;
+import static org.onosproject.yangutils.datamodel.YangDataTypes.INT8;
+import static org.onosproject.yangutils.datamodel.YangDataTypes.UINT16;
+import static org.onosproject.yangutils.datamodel.YangDataTypes.UINT32;
+import static org.onosproject.yangutils.datamodel.YangDataTypes.UINT64;
+import static org.onosproject.yangutils.datamodel.YangDataTypes.UINT8;
+import static org.onosproject.yangutils.utils.UtilConstants.ADD;
+import static org.onosproject.yangutils.utils.UtilConstants.EMPTY_STRING;
+import static org.onosproject.yangutils.utils.YangConstructType.LENGTH_DATA;
+import static org.onosproject.yangutils.utils.YangConstructType.RANGE_DATA;
+import static org.onosproject.yangutils.datamodel.utils.builtindatatype.BuiltInTypeObjectFactory.getDataObjectFromString;
+
+/**
+ * Represents restriction resolver which provide common utility used by parser
+ * and during linking for restriction resolution.
+ */
+public final class RestrictionResolver {
+
+    private static final String PIPE = "|";
+    private static final String INTERVAL = "..";
+    private static final int MAX_RANGE_BOUNDARY = 2;
+    private static final int MIN_RANGE_BOUNDARY = 1;
+    private static final String MIN_KEYWORD = "min";
+    private static final String MAX_KEYWORD = "max";
+
+    /**
+     * Creates a restriction resolver.
+     */
+    private RestrictionResolver() {
+    }
+
+    /**
+     * Processes the range restriction for parser and linker.
+     *
+     * @param refRangeRestriction    range restriction of referred typedef
+     * @param lineNumber             error line number
+     * @param charPositionInLine     error character position in line
+     * @param hasReferredRestriction whether has referred restriction
+     * @param curRangeString         caller type's range string
+     * @param effectiveType          effective type, when called from linker
+     * @return YANG range restriction
+     * @throws DataModelException a violation in data model rule
+     */
+    public static YangRangeRestriction processRangeRestriction(YangRangeRestriction refRangeRestriction,
+                                                               int lineNumber, int charPositionInLine,
+                                                               boolean hasReferredRestriction,
+                                                               String curRangeString, YangDataTypes effectiveType)
+            throws DataModelException {
+        YangBuiltInDataTypeInfo<?> startValue;
+        YangBuiltInDataTypeInfo<?> endValue;
+        YangRangeRestriction rangeRestriction = new YangRangeRestriction();
+
+        String rangeArgument = removeQuotesAndHandleConcat(curRangeString);
+        String[] rangeArguments = rangeArgument.trim().split(Pattern.quote(PIPE));
+
+        for (String rangePart : rangeArguments) {
+            String startInterval;
+            String endInterval;
+            YangRangeInterval rangeInterval = new YangRangeInterval();
+            String[] rangeBoundary = rangePart.trim().split(Pattern.quote(INTERVAL));
+
+            if (rangeBoundary.length > MAX_RANGE_BOUNDARY) {
+                DataModelException dataModelException = new DataModelException("YANG file error : " +
+                        YangConstructType.getYangConstructType(RANGE_DATA) + " " + rangeArgument +
+                        " is not valid.");
+                dataModelException.setLine(lineNumber);
+                dataModelException.setCharPosition(charPositionInLine);
+                throw dataModelException;
+            }
+
+            if (rangeBoundary.length == MIN_RANGE_BOUNDARY) {
+                startInterval = rangeBoundary[0].trim();
+                endInterval = rangeBoundary[0].trim();
+            } else {
+                startInterval = rangeBoundary[0].trim();
+                endInterval = rangeBoundary[1].trim();
+            }
+
+            try {
+                if (hasReferredRestriction && startInterval.equals(MIN_KEYWORD)
+                        && refRangeRestriction.getMinRestrictedvalue() != null) {
+                    startValue = refRangeRestriction.getMinRestrictedvalue();
+                } else if (hasReferredRestriction && startInterval.equals(MAX_KEYWORD)
+                        && refRangeRestriction.getMaxRestrictedvalue() != null) {
+                    startValue = refRangeRestriction.getMaxRestrictedvalue();
+                } else {
+                    startValue = getDataObjectFromString(startInterval, effectiveType);
+                }
+                if (hasReferredRestriction && endInterval.equals(MIN_KEYWORD)
+                        && refRangeRestriction.getMinRestrictedvalue() != null) {
+                    endValue = refRangeRestriction.getMinRestrictedvalue();
+                } else if (hasReferredRestriction && endInterval.equals(MAX_KEYWORD)
+                        && refRangeRestriction.getMaxRestrictedvalue() != null) {
+                    endValue = refRangeRestriction.getMaxRestrictedvalue();
+                } else {
+                    endValue = getDataObjectFromString(endInterval, effectiveType);
+                }
+            } catch (Exception e) {
+                DataModelException dataModelException = new DataModelException(e.getMessage());
+                dataModelException.setLine(lineNumber);
+                dataModelException.setCharPosition(charPositionInLine);
+                throw dataModelException;
+            }
+
+            rangeInterval.setStartValue(startValue);
+            rangeInterval.setEndValue(endValue);
+
+            try {
+                rangeRestriction.addRangeRestrictionInterval(rangeInterval);
+            } catch (DataModelException dataModelException) {
+                dataModelException.setLine(lineNumber);
+                dataModelException.setCharPosition(charPositionInLine);
+                throw dataModelException;
+            }
+        }
+        return rangeRestriction;
+    }
+
+    /**
+     * Processes the length restriction for parser and linker.
+     *
+     * @param refLengthRestriction   length restriction of referred typedef
+     * @param lineNumber             error line number
+     * @param charPositionInLine     error character position in line
+     * @param hasReferredRestriction whether has referred restriction
+     * @param curLengthString        caller type's length string
+     * @return YANG range restriction
+     * @throws DataModelException a violation in data model rule
+     */
+    public static YangRangeRestriction processLengthRestriction(YangRangeRestriction refLengthRestriction,
+                                                                int lineNumber, int charPositionInLine,
+                                                                boolean hasReferredRestriction,
+                                                                String curLengthString) throws DataModelException {
+
+        YangBuiltInDataTypeInfo<?> startValue;
+        YangBuiltInDataTypeInfo<?> endValue;
+        YangRangeRestriction lengthRestriction = new YangRangeRestriction<>();
+
+        String rangeArgument = removeQuotesAndHandleConcat(curLengthString);
+        String[] rangeArguments = rangeArgument.trim().split(Pattern.quote(PIPE));
+
+        for (String rangePart : rangeArguments) {
+            String startInterval;
+            String endInterval;
+            YangRangeInterval rangeInterval = new YangRangeInterval<>();
+            String[] rangeBoundary = rangePart.trim().split(Pattern.quote(INTERVAL));
+
+            if (rangeBoundary.length > MAX_RANGE_BOUNDARY) {
+                DataModelException dataModelException = new DataModelException("YANG file error : " +
+                        YangConstructType.getYangConstructType(LENGTH_DATA) + " " + rangeArgument +
+                        " is not valid.");
+                dataModelException.setLine(lineNumber);
+                dataModelException.setCharPosition(charPositionInLine);
+                throw dataModelException;
+            }
+
+            if (rangeBoundary.length == MIN_RANGE_BOUNDARY) {
+                startInterval = rangeBoundary[0].trim();
+                endInterval = rangeBoundary[0].trim();
+            } else {
+                startInterval = rangeBoundary[0].trim();
+                endInterval = rangeBoundary[1].trim();
+            }
+
+            try {
+                if (hasReferredRestriction && startInterval.equals(MIN_KEYWORD)
+                        && refLengthRestriction.getMinRestrictedvalue() != null) {
+                    startValue = refLengthRestriction.getMinRestrictedvalue();
+                } else if (hasReferredRestriction && startInterval.equals(MAX_KEYWORD)
+                        && refLengthRestriction.getMaxRestrictedvalue() != null) {
+                    startValue = refLengthRestriction.getMaxRestrictedvalue();
+                } else {
+                    startValue = getDataObjectFromString(startInterval, YangDataTypes.UINT64);
+                }
+                if (hasReferredRestriction && endInterval.equals(MIN_KEYWORD)
+                        && refLengthRestriction.getMinRestrictedvalue() != null) {
+                    endValue = refLengthRestriction.getMinRestrictedvalue();
+                } else if (hasReferredRestriction && endInterval.equals(MAX_KEYWORD)
+                        && refLengthRestriction.getMaxRestrictedvalue() != null) {
+                    endValue = refLengthRestriction.getMaxRestrictedvalue();
+                } else {
+                    endValue = getDataObjectFromString(endInterval, YangDataTypes.UINT64);
+                }
+            } catch (Exception e) {
+                DataModelException dataModelException = new DataModelException(e.getMessage());
+                dataModelException.setLine(lineNumber);
+                dataModelException.setCharPosition(charPositionInLine);
+                throw dataModelException;
+            }
+
+            rangeInterval.setStartValue(startValue);
+            rangeInterval.setEndValue(endValue);
+
+            try {
+                lengthRestriction.addRangeRestrictionInterval(rangeInterval);
+            } catch (DataModelException dataModelException) {
+                dataModelException.setLine(lineNumber);
+                dataModelException.setCharPosition(charPositionInLine);
+                throw dataModelException;
+            }
+        }
+        return lengthRestriction;
+    }
+
+    /**
+     * Returns whether the data type is of range restricted type.
+     *
+     * @param dataType data type to be checked
+     * @return true, if data type can have range restrictions, false otherwise
+     */
+    public static boolean isOfRangeRestrictedType(YangDataTypes dataType) {
+        return (dataType == INT8
+                || dataType == INT16
+                || dataType == INT32
+                || dataType == INT64
+                || dataType == UINT8
+                || dataType == UINT16
+                || dataType == UINT32
+                || dataType == UINT64
+                || dataType == DECIMAL64);
+    }
+
+    /**
+     * Removes doubles quotes and concatenates if string has plus symbol.
+     *
+     * @param yangStringData string from yang file
+     * @return concatenated string after removing double quotes
+     */
+    private 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();
+    }
+}
diff --git a/src/main/java/org/onosproject/yangutils/datamodel/utils/builtindatatype/BuiltInTypeObjectFactory.java b/src/main/java/org/onosproject/yangutils/datamodel/utils/builtindatatype/BuiltInTypeObjectFactory.java
new file mode 100644
index 0000000..4c2d79b
--- /dev/null
+++ b/src/main/java/org/onosproject/yangutils/datamodel/utils/builtindatatype/BuiltInTypeObjectFactory.java
@@ -0,0 +1,75 @@
+/*-
+ * 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.datamodel.utils.builtindatatype;
+
+import org.onosproject.yangutils.datamodel.YangDataTypes;
+
+/**
+ * Factory to create an object of required type.
+ */
+public final class BuiltInTypeObjectFactory {
+
+    /**
+     * Utility factory class, hence the object creation is forbidden.
+     */
+    private BuiltInTypeObjectFactory() {
+    }
+
+    /**
+     * Given the value represented in string return the corresponding types
+     * object with the value initialized.
+     *
+     * @param valueInStr  value represented in string
+     * @param builtInType built in data type
+     * @param <T>         the data type of the target object
+     * @return the target data type object with the value initialized
+     */
+    public static <T extends YangBuiltInDataTypeInfo<?>> T getDataObjectFromString(String valueInStr,
+                                                                                   YangDataTypes builtInType) {
+
+        switch (builtInType) {
+            case INT8: {
+                return (T) new YangInt8(valueInStr);
+            }
+            case INT16: {
+                return (T) new YangInt16(valueInStr);
+            }
+            case INT32: {
+                return (T) new YangInt32(valueInStr);
+            }
+            case INT64: {
+                return (T) new YangInt64(valueInStr);
+            }
+            case UINT8: {
+                return (T) new YangUint8(valueInStr);
+            }
+            case UINT16: {
+                return (T) new YangUint16(valueInStr);
+            }
+            case UINT32: {
+                return (T) new YangUint32(valueInStr);
+            }
+            case UINT64: {
+                return (T) new YangUint64(valueInStr);
+            }
+            default: {
+                throw new DataTypeException("YANG file error : Unsupported data type");
+            }
+        }
+
+    }
+
+}
diff --git a/src/main/java/org/onosproject/yangutils/datamodel/utils/builtindatatype/DataTypeException.java b/src/main/java/org/onosproject/yangutils/datamodel/utils/builtindatatype/DataTypeException.java
new file mode 100644
index 0000000..8c24d6c
--- /dev/null
+++ b/src/main/java/org/onosproject/yangutils/datamodel/utils/builtindatatype/DataTypeException.java
@@ -0,0 +1,61 @@
+/*
+ * 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.datamodel.utils.builtindatatype;
+
+/**
+ * Base class for exceptions in data type.
+ */
+public class DataTypeException extends RuntimeException {
+
+    private static final long serialVersionUID = 20160211L;
+
+    /**
+     * Create a new data type exception.
+     */
+    public DataTypeException() {
+        super();
+    }
+
+    /**
+     * Creates a new data type exception with given message.
+     *
+     * @param message the detail of exception in string
+     */
+    public DataTypeException(String message) {
+        super(message);
+    }
+
+    /**
+     * Creates a new data type exception from given message and cause.
+     *
+     * @param message the detail of exception in string
+     * @param cause   underlying cause of the error
+     */
+    public DataTypeException(final String message, final Throwable cause) {
+        super(message, cause);
+    }
+
+    /**
+     * Creates a new data type exception from cause.
+     *
+     * @param cause underlying cause of the error
+     */
+    public DataTypeException(final Throwable cause) {
+        super(cause);
+    }
+
+}
diff --git a/src/main/java/org/onosproject/yangutils/datamodel/utils/builtindatatype/YangBinary.java b/src/main/java/org/onosproject/yangutils/datamodel/utils/builtindatatype/YangBinary.java
new file mode 100644
index 0000000..a93379b
--- /dev/null
+++ b/src/main/java/org/onosproject/yangutils/datamodel/utils/builtindatatype/YangBinary.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.datamodel.utils.builtindatatype;
+
+import java.util.Objects;
+import com.google.common.base.MoreObjects;
+
+/**
+ * Represents binary data type.
+ */
+public final class YangBinary {
+
+    private byte[] byteArray;
+
+    /**
+     * Creates an instance of YANG binary.
+     */
+    private YangBinary() {
+    }
+
+    /**
+     * Creates an instance of YANG binary.
+     *
+     * @param bytes byte array
+     */
+    public YangBinary(byte[] bytes) {
+        this.byteArray = bytes;
+    }
+
+    /**
+     * Returns object of YANG binary.
+     *
+     * @param bytes byte array
+     * @return object of YANG binary
+     */
+    public static YangBinary of(byte[] bytes) {
+        return new YangBinary(bytes);
+    }
+
+    /**
+     * Returns byte array.
+     *
+     * @return byte array
+     */
+    public byte[] byteArray() {
+        return byteArray;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(byteArray);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj instanceof YangBinary) {
+            YangBinary other = (YangBinary) obj;
+            return Objects.equals(byteArray, other.byteArray);
+        }
+        return false;
+    }
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(getClass())
+                .omitNullValues()
+                .add("byteArray", byteArray)
+                .toString();
+    }
+
+    /**
+     * Returns the object of YANG binary fromString input String.
+     *
+     * @param valInString input String
+     * @return Object of YANG binary
+     */
+    public static YangBinary fromString(String valInString) {
+        try {
+            byte[] tmpVal = valInString.getBytes();
+            return of(tmpVal);
+        } catch (Exception e) {
+        }
+        return null;
+    }
+
+}
diff --git a/src/main/java/org/onosproject/yangutils/datamodel/utils/builtindatatype/YangBits.java b/src/main/java/org/onosproject/yangutils/datamodel/utils/builtindatatype/YangBits.java
new file mode 100644
index 0000000..f2c05f7
--- /dev/null
+++ b/src/main/java/org/onosproject/yangutils/datamodel/utils/builtindatatype/YangBits.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.datamodel.utils.builtindatatype;
+
+import java.util.Objects;
+import com.google.common.base.MoreObjects;
+
+/**
+ * Represents bits data type.
+ */
+public class YangBits {
+
+    private byte[] byteArray;
+
+    /**
+     * Creates an instance of YANG bits.
+     */
+    private YangBits() {
+    }
+
+    /**
+     * Creates an instance of YANG bits.
+     *
+     * @param bytes byte array
+     */
+    public YangBits(byte[] bytes) {
+        this.byteArray = bytes;
+    }
+
+    /**
+     * Returns object of YANG bits.
+     *
+     * @param bytes byte array
+     * @return object of YANG bits
+     */
+    public static YangBits of(byte[] bytes) {
+        return new YangBits(bytes);
+    }
+
+    /**
+     * Returns byte array.
+     *
+     * @return byte array
+     */
+    public byte[] byteArray() {
+        return byteArray;
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(byteArray);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj instanceof YangBits) {
+            YangBits other = (YangBits) obj;
+            return Objects.equals(byteArray, other.byteArray);
+        }
+        return false;
+    }
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(getClass())
+                .omitNullValues()
+                .add("byteArray", byteArray)
+                .toString();
+    }
+
+    /**
+     * Returns the object of YANG bits fromString input String.
+     *
+     * @param valInString input String
+     * @return Object of YANG bits
+     */
+    public static YangBits fromString(String valInString) {
+        try {
+            byte[] tmpVal = valInString.getBytes();
+            return of(tmpVal);
+        } catch (Exception e) {
+        }
+        return null;
+    }
+
+}
diff --git a/src/main/java/org/onosproject/yangutils/datamodel/utils/builtindatatype/YangBuiltInDataTypeInfo.java b/src/main/java/org/onosproject/yangutils/datamodel/utils/builtindatatype/YangBuiltInDataTypeInfo.java
new file mode 100644
index 0000000..b082c16
--- /dev/null
+++ b/src/main/java/org/onosproject/yangutils/datamodel/utils/builtindatatype/YangBuiltInDataTypeInfo.java
@@ -0,0 +1,34 @@
+/*
+ * 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.datamodel.utils.builtindatatype;
+
+import org.onosproject.yangutils.datamodel.YangDataTypes;
+
+/**
+ * Represents the list of utility functions to be supported by YANG built in
+ * data type implementations.
+ *
+ * @param <T> The target data type
+ */
+public interface YangBuiltInDataTypeInfo<T> extends Comparable<T> {
+
+    /**
+     * Returns the YANG built in type.
+     *
+     * @return the YANG built in type
+     */
+    YangDataTypes getYangType();
+}
diff --git a/src/main/java/org/onosproject/yangutils/datamodel/utils/builtindatatype/YangDecimal64.java b/src/main/java/org/onosproject/yangutils/datamodel/utils/builtindatatype/YangDecimal64.java
new file mode 100644
index 0000000..ca45073
--- /dev/null
+++ b/src/main/java/org/onosproject/yangutils/datamodel/utils/builtindatatype/YangDecimal64.java
@@ -0,0 +1,111 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.datamodel.utils.builtindatatype;
+
+import java.util.Objects;
+import com.google.common.base.MoreObjects;
+
+/**
+ * Represents YANG decimal 64.
+ */
+public class YangDecimal64 {
+
+    private int fractionDigit;
+
+    /**
+     * Creates an instance of YANG decimal64.
+     */
+    public YangDecimal64() {
+    }
+
+    /**
+     * Creates an instance of of YANG decimal64.
+     *
+     * @param fractionDigit fraction digit
+     */
+    public YangDecimal64(int fractionDigit) {
+        this.setFractionDigit(fractionDigit);
+    }
+
+    /**
+     * Returns fraction digit.
+     *
+     * @return the fractionDigit
+     */
+    public int getFractionDigit() {
+        return fractionDigit;
+    }
+
+    /**
+     * Sets fraction digit.
+     *
+     * @param fractionDigit fraction digits.
+     */
+    public void setFractionDigit(int fractionDigit) {
+        this.fractionDigit = fractionDigit;
+    }
+
+    /**
+     * Returns object of YANG decimal64.
+     *
+     * @param value fraction digit
+     * @return YANG decimal64
+     */
+    public static YangDecimal64 of(int value) {
+        return new YangDecimal64(value);
+    }
+
+    @Override
+    public int hashCode() {
+        return Objects.hash(fractionDigit);
+    }
+
+    @Override
+    public boolean equals(Object obj) {
+        if (this == obj) {
+            return true;
+        }
+        if (obj instanceof YangDecimal64) {
+            YangDecimal64 other = (YangDecimal64) obj;
+            return Objects.equals(fractionDigit, other.fractionDigit);
+        }
+        return false;
+    }
+
+    @Override
+    public String toString() {
+        return MoreObjects.toStringHelper(getClass())
+                .omitNullValues()
+                .add("fractionDigit", fractionDigit)
+                .toString();
+    }
+
+    /**
+     * Returns the object of YANG decimal64 fromString input String.
+     *
+     * @param valInString input String
+     * @return Object of YANG decimal64
+     */
+    public static YangDecimal64 fromString(String valInString) {
+        try {
+            int tmpVal = Integer.parseInt(valInString);
+            return of(tmpVal);
+        } catch (Exception e) {
+        }
+        return null;
+    }
+}
diff --git a/src/main/java/org/onosproject/yangutils/datamodel/utils/builtindatatype/YangInt16.java b/src/main/java/org/onosproject/yangutils/datamodel/utils/builtindatatype/YangInt16.java
new file mode 100644
index 0000000..2a660c1
--- /dev/null
+++ b/src/main/java/org/onosproject/yangutils/datamodel/utils/builtindatatype/YangInt16.java
@@ -0,0 +1,95 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.datamodel.utils.builtindatatype;
+
+import org.onosproject.yangutils.datamodel.YangDataTypes;
+
+
+/**
+ * Handles the YANG's int16 data type processing.
+ *
+ * int16 represents integer values between -32768 and 32767, inclusively.
+ */
+public class YangInt16 implements YangBuiltInDataTypeInfo<YangInt16> {
+
+    /**
+     * YANG's min keyword.
+     */
+    private static final String MIN_KEYWORD = "min";
+
+    /**
+     * YANG's max keyword.
+     */
+    private static final String MAX_KEYWORD = "max";
+
+    /**
+     * Valid minimum value of YANG's int16.
+     */
+    public static final short MIN_VALUE = -32768;
+
+    /**
+     * Valid maximum value of YANG's int16.
+     */
+    public static final short MAX_VALUE = 32767;
+
+    /**
+     * The value of YANG's int16.
+     */
+    private final short value;
+
+    /**
+     * Creates an object with the value initialized with value represented in
+     * string.
+     *
+     * @param valueInString value of the object in string
+     */
+    public YangInt16(String valueInString) {
+
+        if (valueInString.matches(MIN_KEYWORD)) {
+            value = MIN_VALUE;
+        } else if (valueInString.matches(MAX_KEYWORD)) {
+            value = MAX_VALUE;
+        } else {
+            try {
+                value = Short.parseShort(valueInString);
+            } catch (Exception e) {
+                throw new DataTypeException("YANG file error : Input value \"" + valueInString + "\" is not a valid " +
+                        "int16.");
+            }
+        }
+    }
+
+    /**
+     * Returns YANG's int16 value.
+     *
+     * @return value of YANG's int16
+     */
+    public short getValue() {
+        return value;
+    }
+
+    @Override
+    public int compareTo(YangInt16 anotherYangInt16) {
+        return Short.compare(value, anotherYangInt16.value);
+    }
+
+    @Override
+    public YangDataTypes getYangType() {
+        return YangDataTypes.INT16;
+    }
+
+}
diff --git a/src/main/java/org/onosproject/yangutils/datamodel/utils/builtindatatype/YangInt32.java b/src/main/java/org/onosproject/yangutils/datamodel/utils/builtindatatype/YangInt32.java
new file mode 100644
index 0000000..6774b37
--- /dev/null
+++ b/src/main/java/org/onosproject/yangutils/datamodel/utils/builtindatatype/YangInt32.java
@@ -0,0 +1,95 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.datamodel.utils.builtindatatype;
+
+import org.onosproject.yangutils.datamodel.YangDataTypes;
+
+/**
+ * Handles the YANG's int32 data type processing.
+ *
+ * int32 represents integer values between -2147483648 and 2147483647, inclusively.
+ */
+public class YangInt32 implements YangBuiltInDataTypeInfo<YangInt32> {
+
+    /**
+     * YANG's min keyword.
+     */
+    private static final String MIN_KEYWORD = "min";
+
+    /**
+     * YANG's max keyword.
+     */
+    private static final String MAX_KEYWORD = "max";
+
+    /**
+     * Valid minimum value of YANG's int32.
+     */
+    public static final int MIN_VALUE = -2147483648;
+
+    /**
+     * Valid maximum value of YANG's int32.
+     */
+    public static final int MAX_VALUE = 2147483647;
+
+    /**
+     * The value of YANG's int32.
+     */
+    private final int value;
+
+    /**
+     * Creates an object with the value initialized with value represented in
+     * string.
+     *
+     * @param valueInString value of the object in string
+     */
+    public YangInt32(String valueInString) {
+
+        if (valueInString.matches(MIN_KEYWORD)) {
+            value = MIN_VALUE;
+        } else if (valueInString.matches(MAX_KEYWORD)) {
+            value = MAX_VALUE;
+        } else {
+            try {
+                value = Integer.parseInt(valueInString);
+            } catch (Exception e) {
+                throw new DataTypeException("YANG file error : Input value \"" + valueInString + "\" is not a valid " +
+                        "int32.");
+            }
+        }
+    }
+
+
+    /**
+     * Returns YANG's int32 value.
+     *
+     * @return value of YANG's int32
+     */
+    public int getValue() {
+        return value;
+    }
+
+    @Override
+    public int compareTo(YangInt32 anotherYangInt32) {
+        return Integer.compare(value, anotherYangInt32.value);
+    }
+
+    @Override
+    public YangDataTypes getYangType() {
+        return YangDataTypes.INT32;
+    }
+
+}
diff --git a/src/main/java/org/onosproject/yangutils/datamodel/utils/builtindatatype/YangInt64.java b/src/main/java/org/onosproject/yangutils/datamodel/utils/builtindatatype/YangInt64.java
new file mode 100644
index 0000000..6a426d1
--- /dev/null
+++ b/src/main/java/org/onosproject/yangutils/datamodel/utils/builtindatatype/YangInt64.java
@@ -0,0 +1,95 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.datamodel.utils.builtindatatype;
+
+import org.onosproject.yangutils.datamodel.YangDataTypes;
+
+/**
+ * Handles the YANG's int8 data type processing.
+ *
+ * int8 represents integer values between -9223372036854775808 and 9223372036854775807, inclusively.
+ */
+public class YangInt64 implements YangBuiltInDataTypeInfo<YangInt64> {
+
+    /**
+     * YANG's min keyword.
+     */
+    private static final String MIN_KEYWORD = "min";
+
+    /**
+     * YANG's max keyword.
+     */
+    private static final String MAX_KEYWORD = "max";
+
+    /**
+     * Valid minimum value of YANG's int64.
+     */
+    public static final Long MIN_VALUE = 0x8000000000000000L;
+
+    /**
+     * Valid maximum value of YANG's int64.
+     */
+    public static final long MAX_VALUE = 0x7fffffffffffffffL;
+
+    /**
+     * The value of YANG's int64.
+     */
+    private final long value;
+
+    /**
+     * Creates an object with the value initialized with value represented in
+     * string.
+     *
+     * @param valueInString value of the object in string
+     */
+    public YangInt64(String valueInString) {
+
+        if (valueInString.matches(MIN_KEYWORD)) {
+            value = MIN_VALUE;
+        } else if (valueInString.matches(MAX_KEYWORD)) {
+            value = MAX_VALUE;
+        } else {
+            try {
+                value = Long.parseLong(valueInString);
+            } catch (Exception e) {
+                throw new DataTypeException("YANG file error : Input value \"" + valueInString + "\" is not a valid " +
+                        "int64.");
+            }
+        }
+    }
+
+
+    /**
+     * Returns YANG's int64 value.
+     *
+     * @return value of YANG's int64
+     */
+    public long getValue() {
+        return value;
+    }
+
+    @Override
+    public int compareTo(YangInt64 anotherYangInt64) {
+        return Long.compare(value, anotherYangInt64.value);
+    }
+
+    @Override
+    public YangDataTypes getYangType() {
+        return YangDataTypes.INT64;
+    }
+
+}
diff --git a/src/main/java/org/onosproject/yangutils/datamodel/utils/builtindatatype/YangInt8.java b/src/main/java/org/onosproject/yangutils/datamodel/utils/builtindatatype/YangInt8.java
new file mode 100644
index 0000000..df3221d
--- /dev/null
+++ b/src/main/java/org/onosproject/yangutils/datamodel/utils/builtindatatype/YangInt8.java
@@ -0,0 +1,94 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.datamodel.utils.builtindatatype;
+
+import org.onosproject.yangutils.datamodel.YangDataTypes;
+
+/**
+ * Handles the YANG's int8 data type processing.
+ *
+ * int8 represents integer values between -128 and 127, inclusively.
+ */
+public class YangInt8 implements YangBuiltInDataTypeInfo<YangInt8> {
+
+    /**
+     * YANG's min keyword.
+     */
+    private static final String MIN_KEYWORD = "min";
+
+    /**
+     * YANG's max keyword.
+     */
+    private static final String MAX_KEYWORD = "max";
+
+    /**
+     * Valid minimum value of YANG's int8.
+     */
+    public static final byte MIN_VALUE = -128;
+
+    /**
+     * Valid maximum value of YANG's int8.
+     */
+    public static final byte MAX_VALUE = 127;
+
+    /**
+     * The value of YANG's int8.
+     */
+    private final byte value;
+
+    /**
+     * Creates an object with the value initialized with value represented in
+     * string.
+     *
+     * @param valueInString value of the object in string
+     */
+    public YangInt8(String valueInString) {
+
+        if (valueInString.matches(MIN_KEYWORD)) {
+            value = MIN_VALUE;
+        } else if (valueInString.matches(MAX_KEYWORD)) {
+            value = MAX_VALUE;
+        } else {
+            try {
+                value = Byte.parseByte(valueInString);
+            } catch (Exception e) {
+                throw new DataTypeException("YANG file error : Input value \"" + valueInString + "\" is not a valid " +
+                        "int8.");
+            }
+        }
+    }
+
+    /**
+     * Returns YANG's int8 value.
+     *
+     * @return value of YANG's int8
+     */
+    public byte getValue() {
+        return value;
+    }
+
+    @Override
+    public int compareTo(YangInt8 anotherYangInt8) {
+        return Byte.compare(value, anotherYangInt8.value);
+    }
+
+    @Override
+    public YangDataTypes getYangType() {
+        return YangDataTypes.INT8;
+    }
+
+}
diff --git a/src/main/java/org/onosproject/yangutils/datamodel/utils/builtindatatype/YangUint16.java b/src/main/java/org/onosproject/yangutils/datamodel/utils/builtindatatype/YangUint16.java
new file mode 100644
index 0000000..8a4fa93
--- /dev/null
+++ b/src/main/java/org/onosproject/yangutils/datamodel/utils/builtindatatype/YangUint16.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.datamodel.utils.builtindatatype;
+
+import org.onosproject.yangutils.datamodel.YangDataTypes;
+
+/**
+ * Handles the YANG's Uint16 data type processing.
+ *
+ * Uint16 represents integer values between 0 and 65535, inclusively.
+ */
+public class YangUint16 implements YangBuiltInDataTypeInfo<YangUint16> {
+
+    /**
+     * YANG's min keyword.
+     */
+    private static final String MIN_KEYWORD = "min";
+
+    /**
+     * YANG's max keyword.
+     */
+    private static final String MAX_KEYWORD = "max";
+
+    /**
+     * Valid minimum value of YANG's Uint16.
+     */
+    public static final int MIN_VALUE = 0;
+
+    /**
+     * Valid maximum value of YANG's Uint16.
+     */
+    public static final int MAX_VALUE = 65535;
+
+    /**
+     * Value of the object.
+     */
+    private int value;
+
+    /**
+     * Creates an object with the value initialized with value represented in
+     * string.
+     *
+     * @param valueInString value of the object in string
+     */
+    YangUint16(String valueInString) {
+
+        if (valueInString.matches(MIN_KEYWORD)) {
+            value = MIN_VALUE;
+        } else if (valueInString.matches(MAX_KEYWORD)) {
+            value = MAX_VALUE;
+        } else {
+            try {
+                value = Integer.parseInt(valueInString);
+            } catch (Exception e) {
+                throw new DataTypeException("YANG file error : Input value \"" + valueInString + "\" is not a valid " +
+                        "uint16.");
+            }
+        }
+
+        if (value < MIN_VALUE) {
+            throw new DataTypeException("YANG file error : " + valueInString + " is lesser than minimum value "
+                    + MIN_VALUE + ".");
+        } else if (value > MAX_VALUE) {
+            throw new DataTypeException("YANG file error : " + valueInString + " is greater than maximum value "
+                    + MAX_VALUE + ".");
+        }
+    }
+
+    /**
+     * Returns YANG's uint16 value.
+     *
+     * @return value of YANG's uint16
+     */
+    public int getValue() {
+        return value;
+    }
+
+    @Override
+    public int compareTo(YangUint16 another) {
+        return Integer.compare(value, another.value);
+    }
+
+    @Override
+    public YangDataTypes getYangType() {
+        return YangDataTypes.UINT16;
+    }
+
+}
+
diff --git a/src/main/java/org/onosproject/yangutils/datamodel/utils/builtindatatype/YangUint32.java b/src/main/java/org/onosproject/yangutils/datamodel/utils/builtindatatype/YangUint32.java
new file mode 100644
index 0000000..f3dc7ec
--- /dev/null
+++ b/src/main/java/org/onosproject/yangutils/datamodel/utils/builtindatatype/YangUint32.java
@@ -0,0 +1,95 @@
+/*
+ * Copyright 2016-present Open Networking Laboratory
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *     http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.onosproject.yangutils.datamodel.utils.builtindatatype;
+
+import org.onosproject.yangutils.datamodel.YangDataTypes;
+
+/**
+ * Handles the YANG's Uint32 data type processing.
+ *
+ * Uint32 represents integer values between 0 and 4294967295, inclusively.
+ */
+public class YangUint32 implements YangBuiltInDataTypeInfo<YangUint32> {
+
+    private static final String MIN_KEYWORD = "min";
+    private static final String MAX_KEYWORD = "max";
+
+    /**
+     * Valid minimum value of YANG's Uint32.
+     */
+    public static final long MIN_VALUE = 0;
+
+    /**
+     * Valid maximum value of YANG's Uint32.
+     */
+    public static final long MAX_VALUE = 4294967295L;
+
+    /**
+     * Value of the object.
+     */
+    private long value;
+
+    /**
+     * Creates an object with the value initialized with value represented in
+     * string.
+     *
+     * @param valueInString value of the object in string
+     */
+    YangUint32(String valueInString) {
+
+        if (valueInString.matches(MIN_KEYWORD)) {
+            value = MIN_VALUE;
+        } else if (valueInString.matches(MAX_KEYWORD)) {
+            value = MAX_VALUE;
+        } else {
+            try {
+                value = Long.parseLong(valueInString);
+            } catch (Exception e) {
+                throw new DataTypeException("YANG file error : Input value \"" + valueInString + "\" is not a valid " +
+                        "uint32.");
+            }
+        }
+
+        if (value < MIN_VALUE) {
+            throw new DataTypeException("YANG file error : " + valueInString + " is lesser than minimum value "
+                    + MIN_VALUE + ".");
+        } else if (value > MAX_VALUE) {
+            throw new DataTypeException("YANG file error : " + valueInString + " is greater than maximum value "
+                    + MAX_VALUE + ".");
+        }
+    }
+
+    /**
+     * Returns YANG's uint32 value.
+     *
+     * @return value of YANG's uint32
+     */
+    public long getValue() {
+        return value;
+    }
+
+    @Override
+    public int compareTo(YangUint32 another) {
+        return Long.compare(value, another.value);
+    }
+
+    @Override
+    public YangDataTypes getYangType() {
+        return YangDataTypes.UINT32;
+    }
+
+}
diff --git a/src/main/java/org/onosproject/yangutils/datamodel/utils/builtindatatype/YangUint64.java b/src/main/java/org/onosproject/yangutils/datamodel/utils/builtindatatype/YangUint64.java
new file mode 100644
index 0000000..bc66d59
--- /dev/null
+++ b/src/main/java/org/onosproject/yangutils/datamodel/utils/builtindatatype/YangUint64.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.datamodel.utils.builtindatatype;
+
+import java.math.BigInteger;
+import java.util.regex.Pattern;
+import org.onosproject.yangutils.datamodel.YangDataTypes;
+
+/**
+ * Handles the YANG's Uint16 data type processing.
+ *
+ * Uint64 represents integer values between 0 and 18446744073709551615, inclusively.
+ */
+public class YangUint64 implements YangBuiltInDataTypeInfo<YangUint64> {
+
+    /**
+     * YANG's min keyword.
+     */
+    private static final String MIN_KEYWORD = "min";
+
+    /**
+     * YANG's max keyword.
+     */
+    private static final String MAX_KEYWORD = "max";
+
+    /**
+     * YANG's Integer value pattern.
+     */
+    private static final Pattern NON_NEGATIVE_INTEGER_PATTERN = Pattern.compile("[0-9]+");
+
+    /**
+     * Valid minimum value of YANG's Uint64.
+     */
+    public static final BigInteger MIN_VALUE = BigInteger.valueOf(0);
+
+    /**
+     * Valid maximum value of YANG's Uint64.
+     */
+    public static final BigInteger MAX_VALUE = new BigInteger("18446744073709551615");
+
+    /**
+     * Value of the object.
+     */
+    private BigInteger value;
+
+    /**
+     * Creates an object with the value initialized with value represented in
+     * string.
+     *
+     * @param valueInString value of the object in string
+     */
+    YangUint64(String valueInString) {
+
+        if (valueInString.matches(MIN_KEYWORD)) {
+            value = MIN_VALUE;
+        } else if (valueInString.matches(MAX_KEYWORD)) {
+            value = MAX_VALUE;
+        } else if (NON_NEGATIVE_INTEGER_PATTERN.matcher(valueInString).matches()) {
+            value = new BigInteger(valueInString);
+        } else {
+            throw new DataTypeException("YANG file error : Input value \"" + valueInString + "\" is not a valid " +
+                    "uint64.");
+        }
+
+        if (value.compareTo(MIN_VALUE) < 0) {
+            throw new DataTypeException("YANG file error : " + valueInString + " is lesser than minimum value "
+                    + MIN_VALUE + ".");
+        } else if (value.compareTo(MAX_VALUE) > 0) {
+            throw new DataTypeException("YANG file error : " + valueInString + " is greater than maximum value "
+                    + MAX_VALUE + ".");
+        }
+    }
+
+    /**
+     * Returns YANG's uint64 value.
+     *
+     * @return value of YANG's uint64
+     */
+    public BigInteger getValue() {
+        return value;
+    }
+
+    @Override
+    public int compareTo(YangUint64 another) {
+        return value.compareTo(another.value);
+    }
+
+    @Override
+    public YangDataTypes getYangType() {
+        return YangDataTypes.UINT64;
+    }
+
+}
diff --git a/src/main/java/org/onosproject/yangutils/datamodel/utils/builtindatatype/YangUint8.java b/src/main/java/org/onosproject/yangutils/datamodel/utils/builtindatatype/YangUint8.java
new file mode 100644
index 0000000..dd4901f
--- /dev/null
+++ b/src/main/java/org/onosproject/yangutils/datamodel/utils/builtindatatype/YangUint8.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.datamodel.utils.builtindatatype;
+
+import org.onosproject.yangutils.datamodel.YangDataTypes;
+
+/**
+ * Handles the YANG's Uint8 data type processing.
+ *
+ * Uint8 represents integer values between 0 and 255, inclusively.
+ */
+public class YangUint8 implements YangBuiltInDataTypeInfo<YangUint8> {
+
+    /**
+     * YANG's min keyword.
+     */
+    private static final String MIN_KEYWORD = "min";
+
+    /**
+     * YANG's max keyword.
+     */
+    private static final String MAX_KEYWORD = "max";
+
+    /**
+     * Valid minimum value of YANG's Uint8.
+     */
+    public static final short MIN_VALUE = 0;
+
+    /**
+     * Valid maximum value of YANG's Uint8.
+     */
+    public static final short MAX_VALUE = 255;
+
+    /**
+     * Value of the object.
+     */
+    private short value;
+
+    /**
+     * Creates an object with the value initialized with value represented in
+     * string.
+     *
+     * @param valueInString value of the object in string
+     */
+    YangUint8(String valueInString) {
+
+        if (valueInString.matches(MIN_KEYWORD)) {
+            value = MIN_VALUE;
+        } else if (valueInString.matches(MAX_KEYWORD)) {
+            value = MAX_VALUE;
+        } else {
+            try {
+                value = Short.parseShort(valueInString);
+            } catch (Exception e) {
+                throw new DataTypeException("YANG file error : Input value \"" + valueInString + "\" is not a valid " +
+                        "uint8.");
+            }
+        }
+
+        if (value < MIN_VALUE) {
+            throw new DataTypeException("YANG file error : " + valueInString + " is lesser than minimum value "
+                    + MIN_VALUE + ".");
+        } else if (value > MAX_VALUE) {
+            throw new DataTypeException("YANG file error : " + valueInString + " is greater than maximum value "
+                    + MAX_VALUE + ".");
+        }
+    }
+
+    /**
+     * Returns YANG's uint8 value.
+     *
+     * @return value of YANG's uint8
+     */
+    public short getValue() {
+        return value;
+    }
+
+    @Override
+    public int compareTo(YangUint8 another) {
+        return Short.compare(value, another.value);
+    }
+
+    @Override
+    public YangDataTypes getYangType() {
+        return YangDataTypes.UINT8;
+    }
+
+}
diff --git a/src/main/java/org/onosproject/yangutils/datamodel/utils/builtindatatype/package-info.java b/src/main/java/org/onosproject/yangutils/datamodel/utils/builtindatatype/package-info.java
new file mode 100644
index 0000000..d1ceae5
--- /dev/null
+++ b/src/main/java/org/onosproject/yangutils/datamodel/utils/builtindatatype/package-info.java
@@ -0,0 +1,20 @@
+/*-
+ * 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.
+ */
+
+/**
+ * Utilities for YANG built in data types.
+ */
+package org.onosproject.yangutils.datamodel.utils.builtindatatype;