Coding gudilines for class and methods javadocs fixed.

Change-Id: I0153e6391c9ec9eacaac65c3989834b6bf5c65bf
diff --git a/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/parserutils/ListenerCollisionDetector.java b/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/parserutils/ListenerCollisionDetector.java
index 1e2d225..98b3429 100644
--- a/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/parserutils/ListenerCollisionDetector.java
+++ b/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/parserutils/ListenerCollisionDetector.java
@@ -20,13 +20,14 @@
 import org.onosproject.yangutils.datamodel.exceptions.DataModelException;
 import org.onosproject.yangutils.parser.exceptions.ParserException;
 import org.onosproject.yangutils.parser.impl.TreeWalkListener;
+import org.onosproject.yangutils.utils.YangConstructType;
+
 import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.EXIT;
 import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructListenerErrorMessage;
 import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.INVALID_HOLDER;
-import org.onosproject.yangutils.utils.YangConstructType;
 
 /**
- * Check the YANG construct collision in a YANG file.
+ * Represents the detector of YANG construct collision in a YANG file.
  */
 public final class ListenerCollisionDetector {
 
@@ -52,7 +53,7 @@
      */
     public static void detectCollidingChildUtil(TreeWalkListener listener, int line, int charPosition,
             String identifierName, YangConstructType constructType)
-                    throws ParserException {
+            throws ParserException {
 
         if (listener.getParsedDataStack().peek() instanceof CollisionDetector) {
             try {
diff --git a/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/parserutils/ListenerErrorLocation.java b/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/parserutils/ListenerErrorLocation.java
index 1c29fa6..c1c2888 100644
--- a/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/parserutils/ListenerErrorLocation.java
+++ b/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/parserutils/ListenerErrorLocation.java
@@ -17,7 +17,7 @@
 package org.onosproject.yangutils.parser.impl.parserutils;
 
 /**
- * Maintains listener error location.
+ * Represents listener error location.
  */
 public enum ListenerErrorLocation {
     /**
diff --git a/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/parserutils/ListenerErrorMessageConstruction.java b/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/parserutils/ListenerErrorMessageConstruction.java
index 7064e3b..141e3dc 100644
--- a/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/parserutils/ListenerErrorMessageConstruction.java
+++ b/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/parserutils/ListenerErrorMessageConstruction.java
@@ -18,17 +18,17 @@
 
 import org.onosproject.yangutils.utils.YangConstructType;
 
-import static org.onosproject.yangutils.utils.YangConstructType.getYangConstructType;
 import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorLocation.getErrorLocationMessage;
 import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorType.getErrorType;
+import static org.onosproject.yangutils.utils.YangConstructType.getYangConstructType;
 
 /**
- * It's a utility to help construct detailed error message.
+ * Represents a utility to help construct detailed error message.
  */
 public final class ListenerErrorMessageConstruction {
 
     /**
-     * Private constructor.
+     * Creates a object of listen error message.
      */
     private ListenerErrorMessageConstruction() {
     }
diff --git a/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/parserutils/ListenerErrorType.java b/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/parserutils/ListenerErrorType.java
index 6b520d9..f1cb284 100644
--- a/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/parserutils/ListenerErrorType.java
+++ b/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/parserutils/ListenerErrorType.java
@@ -17,7 +17,7 @@
 package org.onosproject.yangutils.parser.impl.parserutils;
 
 /**
- * Maintains listener error type.
+ * Represents listener error type.
  */
 public enum ListenerErrorType {
     /**
diff --git a/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/parserutils/ListenerUtil.java b/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/parserutils/ListenerUtil.java
index fd81898..ffb50e9 100644
--- a/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/parserutils/ListenerUtil.java
+++ b/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/parserutils/ListenerUtil.java
@@ -26,13 +26,14 @@
 import org.antlr.v4.runtime.ParserRuleContext;
 import org.onosproject.yangutils.datamodel.YangNodeIdentifier;
 import org.onosproject.yangutils.parser.antlrgencode.GeneratedYangParser;
-import org.onosproject.yangutils.utils.YangConstructType;
 import org.onosproject.yangutils.parser.exceptions.ParserException;
+import org.onosproject.yangutils.utils.YangConstructType;
 
 /**
- * It's a utility for listener.
+ * Represents an utility for listener.
  */
 public final class ListenerUtil {
+
     private static final Pattern IDENTIFIER_PATTERN = Pattern.compile("[a-zA-Z_][a-zA-Z0-9_.-]*");
     private static final String NON_NEGATIVE_INTEGER_PATTERN = "[0-9]+";
     private static final String PLUS = "+";
@@ -154,7 +155,7 @@
      * @return valid non negative integer value
      */
     public static int getValidNonNegativeIntegerValue(String integerValue, YangConstructType yangConstruct,
-                                           ParserRuleContext ctx) {
+            ParserRuleContext ctx) {
 
         String value = removeQuotesAndHandleConcat(integerValue);
         if (!value.matches(NON_NEGATIVE_INTEGER_PATTERN)) {
@@ -178,7 +179,7 @@
      * @return boolean value either true or false
      */
     public static boolean getValidBooleanValue(String booleanValue, YangConstructType yangConstruct,
-                                                ParserRuleContext ctx) {
+            ParserRuleContext ctx) {
 
         String value = removeQuotesAndHandleConcat(booleanValue);
         if (value.equals(TRUE_KEYWORD)) {
diff --git a/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/parserutils/ListenerValidation.java b/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/parserutils/ListenerValidation.java
index 26d3088..f2c0e7c 100644
--- a/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/parserutils/ListenerValidation.java
+++ b/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/parserutils/ListenerValidation.java
@@ -16,6 +16,9 @@
 
 package org.onosproject.yangutils.parser.impl.parserutils;
 
+import java.util.Iterator;
+import java.util.List;
+
 import org.antlr.v4.runtime.ParserRuleContext;
 import org.onosproject.yangutils.datamodel.YangContainer;
 import org.onosproject.yangutils.datamodel.YangList;
@@ -23,15 +26,13 @@
 import org.onosproject.yangutils.parser.Parsable;
 import org.onosproject.yangutils.parser.exceptions.ParserException;
 import org.onosproject.yangutils.parser.impl.TreeWalkListener;
-import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructListenerErrorMessage;
 import org.onosproject.yangutils.utils.YangConstructType;
+
+import static org.onosproject.yangutils.parser.impl.parserutils.ListenerErrorMessageConstruction.constructListenerErrorMessage;
 import static org.onosproject.yangutils.utils.YangConstructType.getYangConstructType;
 
-import java.util.Iterator;
-import java.util.List;
-
 /**
- * It's a utility to carry out listener validation.
+ * Represents a utility to carry out listener validation.
  */
 public final class ListenerValidation {
 
@@ -54,6 +55,7 @@
     public static void checkStackIsNotEmpty(TreeWalkListener listener, ListenerErrorType errorType,
             YangConstructType yangConstructType, String parsableDataTypeName,
             ListenerErrorLocation errorLocation) {
+
         if (listener.getParsedDataStack().empty()) {
             /*
              * If stack is empty it indicates error condition, value of
@@ -100,6 +102,7 @@
      * @return true/false parent's config value
      */
     public static boolean getParentNodeConfig(TreeWalkListener listener) {
+
         YangNode parentNode;
         Parsable curData = listener.getParsedDataStack().peek();
         if (curData instanceof YangNode) {
@@ -125,7 +128,7 @@
      * @throws ParserException exception if cardinality check fails
      */
     public static void validateCardinalityMaxOne(List<?> childContext, YangConstructType yangChildConstruct,
-                                                 YangConstructType yangParentConstruct, String parentName)
+            YangConstructType yangParentConstruct, String parentName)
             throws ParserException {
 
         if (!childContext.isEmpty() && childContext.size() != 1) {
@@ -152,8 +155,8 @@
      * @throws ParserException exception if cardinality check fails
      */
     public static void validateCardinalityEqualsOne(List<?> childContext, YangConstructType yangChildConstruct,
-                                                    YangConstructType yangParentConstruct, String parentName,
-                                                    ParserRuleContext parentContext)
+            YangConstructType yangParentConstruct, String parentName,
+            ParserRuleContext parentContext)
             throws ParserException {
 
         if (childContext.isEmpty()) {
@@ -187,8 +190,8 @@
      * @throws ParserException exception if cardinality check fails
      */
     public static void validateCardinalityNonZero(List<?> childContext, YangConstructType yangChildConstruct,
-                                                  YangConstructType yangParentConstruct, String parentName,
-                                                  ParserRuleContext parentContext)
+            YangConstructType yangParentConstruct, String parentName,
+            ParserRuleContext parentContext)
             throws ParserException {
 
         if (childContext.isEmpty()) {
@@ -216,8 +219,8 @@
      * @throws ParserException exception if cardinality check fails
      */
     public static void validateMutuallyExclusiveChilds(List<?> child1Context, YangConstructType yangChild1Construct,
-                                                       List<?> child2Context, YangConstructType yangChild2Construct,
-                                                       YangConstructType yangParentConstruct, String parentName)
+            List<?> child2Context, YangConstructType yangChild2Construct,
+            YangConstructType yangParentConstruct, String parentName)
             throws ParserException {
 
         if (!child1Context.isEmpty() && !child2Context.isEmpty()) {
diff --git a/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/parserutils/ParseTreeErrorListener.java b/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/parserutils/ParseTreeErrorListener.java
index 89afb78..af81d6f 100644
--- a/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/parserutils/ParseTreeErrorListener.java
+++ b/utils/yangutils/src/main/java/org/onosproject/yangutils/parser/impl/parserutils/ParseTreeErrorListener.java
@@ -22,6 +22,7 @@
 import org.onosproject.yangutils.parser.exceptions.ParserException;
 
 /**
+ * Represent the parse tree error listener.
  * By default, ANTLR sends all errors to standard error, this is changed by
  * providing this new implementation of interface ANTLRErrorListener. The
  * interface has a syntaxError() method that applies to both lexer and parser.