YANG string restriction listener + YANG Range restriction listener review comment fix

Change-Id: I9e7af9c67f8fbf918d4e0d8ff147a560889ff264
diff --git a/src/main/java/org/onosproject/yangutils/utils/YangConstructType.java b/src/main/java/org/onosproject/yangutils/utils/YangConstructType.java
index f60b650..f9a6fda 100644
--- a/src/main/java/org/onosproject/yangutils/utils/YangConstructType.java
+++ b/src/main/java/org/onosproject/yangutils/utils/YangConstructType.java
@@ -277,7 +277,17 @@
     /**
      * Identifies the YANG range element parsed data.
      */
-    RANGE_DATA;
+    RANGE_DATA,
+
+    /**
+     * Identifies the YANG length element parsed data.
+     */
+    LENGTH_DATA,
+
+    /**
+     * Identifies the YANG pattern element parsed data.
+     */
+    PATTERN_DATA;
 
     /**
      * Returns the YANG construct keyword corresponding to enum values.
@@ -392,6 +402,10 @@
                 return "union";
             case RANGE_DATA:
                 return "range";
+            case LENGTH_DATA:
+                return "length";
+            case PATTERN_DATA:
+                return "pattern";
             default:
                 return "yang";
         }
diff --git a/src/main/java/org/onosproject/yangutils/utils/builtindatatype/BuiltInTypeObjectFactory.java b/src/main/java/org/onosproject/yangutils/utils/builtindatatype/BuiltInTypeObjectFactory.java
new file mode 100644
index 0000000..7002129
--- /dev/null
+++ b/src/main/java/org/onosproject/yangutils/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.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
+     * @return the target data type object with the value initialized
+     * @param <T> the data type of the target object
+     */
+    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/utils/builtindatatype/DataTypeException.java b/src/main/java/org/onosproject/yangutils/utils/builtindatatype/DataTypeException.java
new file mode 100644
index 0000000..4cad2cd
--- /dev/null
+++ b/src/main/java/org/onosproject/yangutils/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.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/utils/builtindatatype/YangBuiltInDataTypeInfo.java b/src/main/java/org/onosproject/yangutils/utils/builtindatatype/YangBuiltInDataTypeInfo.java
new file mode 100644
index 0000000..437fe0f
--- /dev/null
+++ b/src/main/java/org/onosproject/yangutils/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.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/utils/builtindatatype/YangInt16.java b/src/main/java/org/onosproject/yangutils/utils/builtindatatype/YangInt16.java
new file mode 100644
index 0000000..1ad76b5
--- /dev/null
+++ b/src/main/java/org/onosproject/yangutils/utils/builtindatatype/YangInt16.java
@@ -0,0 +1,93 @@
+/*
+ * 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.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 : " + valueInString + " is not valid.");
+            }
+        }
+    }
+
+    /**
+     * 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/utils/builtindatatype/YangInt32.java b/src/main/java/org/onosproject/yangutils/utils/builtindatatype/YangInt32.java
new file mode 100644
index 0000000..93dcec6
--- /dev/null
+++ b/src/main/java/org/onosproject/yangutils/utils/builtindatatype/YangInt32.java
@@ -0,0 +1,93 @@
+/*
+ * 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.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 : " + valueInString + " is not valid.");
+            }
+        }
+    }
+
+
+    /**
+     * 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/utils/builtindatatype/YangInt64.java b/src/main/java/org/onosproject/yangutils/utils/builtindatatype/YangInt64.java
new file mode 100644
index 0000000..a046ee8
--- /dev/null
+++ b/src/main/java/org/onosproject/yangutils/utils/builtindatatype/YangInt64.java
@@ -0,0 +1,93 @@
+/*
+ * 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.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 : " + valueInString + " is not valid.");
+            }
+        }
+    }
+
+
+    /**
+     * 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/utils/builtindatatype/YangInt8.java b/src/main/java/org/onosproject/yangutils/utils/builtindatatype/YangInt8.java
new file mode 100644
index 0000000..c902410
--- /dev/null
+++ b/src/main/java/org/onosproject/yangutils/utils/builtindatatype/YangInt8.java
@@ -0,0 +1,92 @@
+/*
+ * 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.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 : " + valueInString + " is not valid.");
+            }
+        }
+    }
+
+    /**
+     * 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/utils/builtindatatype/YangUint16.java b/src/main/java/org/onosproject/yangutils/utils/builtindatatype/YangUint16.java
new file mode 100644
index 0000000..b109103
--- /dev/null
+++ b/src/main/java/org/onosproject/yangutils/utils/builtindatatype/YangUint16.java
@@ -0,0 +1,101 @@
+/*
+ * 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.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 : " + valueInString + " is not valid.");
+            }
+        }
+
+        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/utils/builtindatatype/YangUint32.java b/src/main/java/org/onosproject/yangutils/utils/builtindatatype/YangUint32.java
new file mode 100644
index 0000000..e356055
--- /dev/null
+++ b/src/main/java/org/onosproject/yangutils/utils/builtindatatype/YangUint32.java
@@ -0,0 +1,93 @@
+/*
+ * 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.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 : " + valueInString + " is not valid.");
+            }
+        }
+
+        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/utils/builtindatatype/YangUint64.java b/src/main/java/org/onosproject/yangutils/utils/builtindatatype/YangUint64.java
new file mode 100644
index 0000000..70001ae
--- /dev/null
+++ b/src/main/java/org/onosproject/yangutils/utils/builtindatatype/YangUint64.java
@@ -0,0 +1,105 @@
+/*
+ * 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.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 : " + valueInString + " is not valid.");
+        }
+
+        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/utils/builtindatatype/YangUint8.java b/src/main/java/org/onosproject/yangutils/utils/builtindatatype/YangUint8.java
new file mode 100644
index 0000000..caf0628
--- /dev/null
+++ b/src/main/java/org/onosproject/yangutils/utils/builtindatatype/YangUint8.java
@@ -0,0 +1,100 @@
+/*
+ * 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.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 : " + valueInString + " is not valid.");
+            }
+        }
+
+        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/utils/builtindatatype/package-info.java b/src/main/java/org/onosproject/yangutils/utils/builtindatatype/package-info.java
new file mode 100644
index 0000000..9d3aa33
--- /dev/null
+++ b/src/main/java/org/onosproject/yangutils/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.utils.builtindatatype;