[ONOS-3905, ONOS-3901, ONOS-3900] choice, grouping and augment data model support.
Change-Id: Iaee5175e4e06249f5b56192f4744e9297289194c
diff --git a/utils/yangutils/src/main/java/org/onosproject/yangutils/datamodel/YangEnum.java b/utils/yangutils/src/main/java/org/onosproject/yangutils/datamodel/YangEnum.java
new file mode 100644
index 0000000..be3f845
--- /dev/null
+++ b/utils/yangutils/src/main/java/org/onosproject/yangutils/datamodel/YangEnum.java
@@ -0,0 +1,201 @@
+/*
+ * 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;
+
+import org.onosproject.yangutils.datamodel.exceptions.DataModelException;
+import org.onosproject.yangutils.parser.Parsable;
+import org.onosproject.yangutils.parser.ParsableDataType;
+
+/*-
+ * The "ENUM" statement, which is a sub-statement to the "type"
+ * statement, MUST be present if the type is "enumeration". It is
+ * repeatedly used to specify each assigned name of an enumeration type.
+ * It takes as an argument a string which is the assigned name. The
+ * string MUST NOT be empty and MUST NOT have any leading or trailing
+ * whitespace characters. The use of Unicode control codes SHOULD be
+ * avoided.
+ *
+ * The statement is optionally followed by a block of sub-statements that
+ * holds detailed ENUM information.
+ * All assigned names in an enumeration MUST be unique.
+ *
+ * The ENUM's sub-statements
+ *
+ * +--------------+---------+-------------+------------------+
+ * | substatement | section | cardinality |data model mapping|
+ * +--------------+---------+-------------+------------------+
+ * | description | 7.19.3 | 0..1 | - string |
+ * | reference | 7.19.4 | 0..1 | - string |
+ * | status | 7.19.2 | 0..1 | - YangStatus |
+ * | value | 9.6.4.2 | 0..1 | - int |
+ * +--------------+---------+-------------+------------------+
+ */
+
+/**
+ * Maintains the ENUM data type information.
+ */
+public class YangEnum implements YangCommonInfo, Parsable {
+
+ /**
+ * Named value for the ENUM.
+ */
+ private String namedValue;
+
+ /**
+ * Description of the ENUM value.
+ */
+ private String description;
+
+ /**
+ * Reference info of the ENUM value.
+ */
+ private String reference;
+
+ /**
+ * Status of the ENUM value.
+ */
+ private YangStatusType status;
+
+ /**
+ * value of ENUM.
+ */
+ private int value;
+
+ /**
+ * Create a YANG ENUM.
+ */
+ public YangEnum() {
+
+ }
+
+ /**
+ * Get the named value.
+ *
+ * @return the named value.
+ */
+ public String getNamedValue() {
+ return namedValue;
+ }
+
+ /**
+ * Set the named value.
+ *
+ * @param namedValue the named value to set.
+ */
+ public void setNamedValue(String namedValue) {
+ this.namedValue = namedValue;
+ }
+
+ /**
+ * Get the description.
+ *
+ * @return the description.
+ */
+ public String getDescription() {
+ return description;
+ }
+
+ /**
+ * Set the description.
+ *
+ * @param description set the description.
+ */
+ public void setDescription(String description) {
+ this.description = description;
+ }
+
+ /**
+ * Get the textual reference.
+ *
+ * @return the reference.
+ */
+ public String getReference() {
+ return reference;
+ }
+
+ /**
+ * Set the textual reference.
+ *
+ * @param reference the reference to set.
+ */
+ public void setReference(String reference) {
+ this.reference = reference;
+ }
+
+ /**
+ * Get the status.
+ *
+ * @return the status.
+ */
+ public YangStatusType getStatus() {
+ return status;
+ }
+
+ /**
+ * Set the status.
+ *
+ * @param status the status to set.
+ */
+ public void setStatus(YangStatusType status) {
+ this.status = status;
+ }
+
+ /**
+ * Get the value.
+ *
+ * @return the value.
+ */
+ public int getValue() {
+ return value;
+ }
+
+ /**
+ * Set the value.
+ *
+ * @param value the value to set.
+ */
+ public void setValue(int value) {
+ this.value = value;
+ }
+
+ /**
+ * Returns the type of the data.
+ *
+ * @return ParsedDataType returns ENUM_DATA
+ */
+ public ParsableDataType getParsableDataType() {
+ return ParsableDataType.ENUM_DATA;
+ }
+
+ /**
+ * Validate the data on entering the corresponding parse tree node.
+ *
+ * @throws DataModelException a violation of data model rules.
+ */
+ public void validateDataOnEntry() throws DataModelException {
+ // TODO auto-generated method stub, to be implemented by parser
+ }
+
+ /**
+ * Validate the data on exiting the corresponding parse tree node.
+ *
+ * @throws DataModelException a violation of data model rules.
+ */
+ public void validateDataOnExit() throws DataModelException {
+ // TODO auto-generated method stub, to be implemented by parser
+ }
+}