diff --git a/src/main/java/org/onosproject/yangutils/utils/UtilConstants.java b/src/main/java/org/onosproject/yangutils/utils/UtilConstants.java
index 9f52cb7..369b08a 100644
--- a/src/main/java/org/onosproject/yangutils/utils/UtilConstants.java
+++ b/src/main/java/org/onosproject/yangutils/utils/UtilConstants.java
@@ -32,118 +32,405 @@
     }
 
     /**
-     * For java-docs.
+     * JavaDocs for impl class.
      */
     public static final String IMPL_CLASS_JAVA_DOC = " * Provides the implementation of ";
+
+    /**
+     * JavaDocs for builder class.
+     */
     public static final String BUILDER_CLASS_JAVA_DOC = " * Provides the builder implementation of ";
+
+    /**
+     * JavaDocs for interface class.
+     */
     public static final String INTERFACE_JAVA_DOC = " * Abstraction of an entity which provides functionalities of ";
+
+    /**
+     * JavaDocs for builder interface class.
+     */
     public static final String BUILDER_INTERFACE_JAVA_DOC = " * Builder for ";
+
+    /**
+     * JavaDocs for package info class.
+     */
     public static final String PACKAGE_INFO_JAVADOC = " * Implementation of YANG file ";
+
+    /**
+     * JavaDocs's first line.
+     */
     public static final String JAVA_DOC_FIRST_LINE = "/**\n";
+
+    /**
+     * JavaDocs's last line.
+     */
     public static final String JAVA_DOC_END_LINE = " */\n";
+
+    /**
+     * JavaDocs's param annotation.
+     */
     public static final String JAVA_DOC_PARAM = " * @param ";
+
+    /**
+     * JavaDocs's return annotation.
+     */
     public static final String JAVA_DOC_RETURN = " * @return ";
+
+    /**
+     * JavaDocs's throw annotation.
+     */
     public static final String JAVA_DOC_THROWS = " * @throws ";
+
+    /**
+     * JavaDocs's description for setter method.
+     */
     public static final String JAVA_DOC_SETTERS = " * Returns the builder object of ";
+
+    /**
+     * JavaDocs's description for OF method.
+     */
     public static final String JAVA_DOC_OF = " * Returns the object of ";
+
+    /**
+     * JavaDocs's description for typedef' setter method.
+     */
     public static final String JAVA_DOC_SETTERS_COMMON = " * Sets the value of ";
+
+    /**
+     * JavaDocs's description for getter method.
+     */
     public static final String JAVA_DOC_GETTERS = " * Returns the attribute ";
+
+    /**
+     * JavaDocs's description for default constructor.
+     */
     public static final String JAVA_DOC_DEFAULT_CONSTRUCTOR = " * Default Constructor.\n";
+
+    /**
+     * JavaDocs's description for constructor.
+     */
     public static final String JAVA_DOC_CONSTRUCTOR = " * Construct the object of ";
+
+    /**
+     * JavaDocs's description for build method.
+     */
     public static final String JAVA_DOC_BUILD = " * Builds object of ";
+
+    /**
+     * JavaDocs's return statement for build method.
+     */
     public static final String JAVA_DOC_BUILD_RETURN = "object of ";
 
     /**
-     * Basic requirements.
+     * JavaDocs's statement for builder object.
+     */
+    public static final String BUILDER_OBJECT = "builder object of ";
+
+    /**
+     * Static attribute for new line.
      */
     public static final String NEW_LINE = "\n";
+
+    /**
+     * Static attribute for multiple new line.
+     */
     public static final String MULTIPLE_NEW_LINE = "\n\n";
+
+    /**
+     * Static attribute for empty line.
+     */
     public static final String EMPTY_STRING = "";
-    public static final String NEW_LINE_ESTRIC = " *\n";
+
+    /**
+     * Static attribute for new line with asterisk.
+     */
+    public static final String NEW_LINE_ASTERISK = " *\n";
+
+    /**
+     * Static attribute for period.
+     */
     public static final String PERIOD = ".";
+
+    /**
+     * Static attribute for colan.
+     */
     public static final String COLAN = ":";
+
+    /**
+     * Static attribute for underscore.
+     */
     public static final String UNDER_SCORE = "_";
+
+    /**
+     * Static attribute for semi-colan.
+     */
     public static final String SEMI_COLAN = ";";
+
+    /**
+     * Static attribute for hyphen.
+     */
     public static final String HYPHEN = "-";
+
+    /**
+     * Static attribute for space.
+     */
     public static final String SPACE = " ";
+
+    /**
+     * Static attribute for tab.
+     */
     public static final String TAB = "\t";
+
+    /**
+     * Static attribute for new line.
+     */
     public static final String EQUAL = "=";
+
+    /**
+     * Static attribute for slash syntax.
+     */
     public static final String SLASH = File.separator;
+
+    /**
+     * Static attribute for add syntax.
+     */
     public static final String ADD = "+";
+
+    /**
+     * Static attribute for asterisk.
+     */
     public static final String ASTERISK = "*";
+
+    /**
+     * Static attribute for at.
+     */
     public static final String AT = "@";
+
+    /**
+     * Static attribute for quotes.
+     */
     public static final String QUOTES = "\"";
+
+    /**
+     * Static attribute for ampersand.
+     */
     public static final String AND = "&";
+
+    /**
+     * Static attribute for comma.
+     */
     public static final String COMMA = ",";
+
+    /**
+     * Static attribute for add syntax.
+     */
     public static final String ADD_STRING = "add";
+
+    /**
+     * Static attribute for check not null syntax.
+     */
     public static final String CHECK_NOT_NULL_STRING = "checkNotNull";
+
+    /**
+     * Static attribute for hash code syntax.
+     */
     public static final String HASH_CODE_STRING = "hashCode";
+
+    /**
+     * Static attribute for equals syntax.
+     */
     public static final String EQUALS_STRING = "equals";
+
+    /**
+     * Static attribute for object.
+     */
     public static final String OBJECT_STRING = "Object";
+
+    /**
+     * Static attribute for instance of syntax.
+     */
     public static final String INSTANCE_OF = " instanceof ";
 
+    /**
+     * Static attribute for value syntax.
+     */
     public static final String VALUE = "value";
+
+    /**
+     * Static attribute for suffix s.
+     */
     public static final String SUFFIX_S = "s";
 
+    /**
+     * Static attribute for if.
+     */
     public static final String IF = "if";
+
+    /**
+     * Static attribute for for.
+     */
     public static final String FOR = "for";
+
+    /**
+     * Static attribute for while.
+     */
     public static final String WHILE = "while";
+
+    /**
+     * Static attribute for of.
+     */
     public static final String OF = "of";
+
+    /**
+     * Static attribute for other.
+     */
     public static final String OTHER = "other";
+
+    /**
+     * Static attribute for obj syntax.
+     */
     public static final String OBJ = "obj";
+
+    /**
+     * Static attribute for hash syntax.
+     */
     public static final String HASH = "hash";
+
+    /**
+     * Static attribute for to syntax.
+     */
     public static final String TO = "to";
 
+    /**
+     * Static attribute for true syntax.
+     */
     public static final String TRUE = "true";
+
+    /**
+     * Static attribute for false syntax.
+     */
     public static final String FALSE = "false";
+
+    /**
+     * Static attribute for org.
+     */
     public static final String ORG = "org";
+
+    /**
+     * Static attribute for temp.
+     */
     public static final String TEMP = "temp";
+
+    /**
+     * Static attribute for YANG file directory.
+     */
     public static final String YANG_RESOURCES = "yang/resources";
 
     /**
-     * For brackets.
+     * Static attribute for diamond close bracket syntax.
      */
     public static final String DIAMOND_OPEN_BRACKET = "<";
+
+    /**
+     * Static attribute for diamond close bracket syntax.
+     */
     public static final String DIAMOND_CLOSE_BRACKET = ">";
+
+    /**
+     * Static attribute for square open bracket syntax.
+     */
     public static final String SQUARE_OPEN_BRACKET = "[";
+
+    /**
+     * Static attribute for square close bracket syntax.
+     */
     public static final String SQUARE_CLOSE_BRACKET = "]";
+
+    /**
+     * Static attribute for open parenthesis syntax.
+     */
     public static final String OPEN_PARENTHESIS = "(";
+
+    /**
+     * Static attribute for close parenthesis syntax.
+     */
     public static final String CLOSE_PARENTHESIS = ")";
+
+    /**
+     * Static attribute for open curly bracket syntax.
+     */
     public static final String OPEN_CURLY_BRACKET = "{";
+
+    /**
+     * Static attribute for close curly bracket syntax.
+     */
     public static final String CLOSE_CURLY_BRACKET = "}";
 
     /**
-     * For methods.
+     * Static attribute for getter method prefix.
      */
     public static final String GET_METHOD_PREFIX = "get";
+
+    /**
+     * Static attribute for setter method prefix.
+     */
     public static final String SET_METHOD_PREFIX = "set";
 
     /**
-     * For indentation.
+     * Static attribute for four space indentation.
      */
     public static final String FOUR_SPACE_INDENTATION = "    ";
+
+    /**
+     * Static attribute for eight space indentation.
+     */
     public static final String EIGHT_SPACE_INDENTATION = FOUR_SPACE_INDENTATION + FOUR_SPACE_INDENTATION;
+
+    /**
+     * Static attribute for twelve space indentation.
+     */
     public static final String TWELVE_SPACE_INDENTATION = FOUR_SPACE_INDENTATION + EIGHT_SPACE_INDENTATION;
+
+    /**
+     * Static attribute for sixteen space indentation.
+     */
     public static final String SIXTEEN_SPACE_INDENTATION = EIGHT_SPACE_INDENTATION + EIGHT_SPACE_INDENTATION;
 
     /**
-     * For directories.
+     * Static attribute for generated code path.
      */
     public static final String YANG_GEN_DIR = "src/main/java/";
+
+    /**
+     * Static attribute for base package.
+     */
     public static final String DEFAULT_BASE_PKG = "org.onosproject.yang.gen";
+
+    /**
+     * Static attribute for YANG date prefix.
+     */
     public static final String REVISION_PREFIX = "rev";
+
+    /**
+     * Static attribute for YANG version perifx.
+     */
     public static final String VERSION_PREFIX = "v";
 
     /**
-     * For class modifiers.
+     * Static attribute for private modifier.
      */
     public static final String PRIVATE = "private";
-    public static final String PUBLIC = "public";
-    public static final String PROTECTED = "protected";
 
     /**
-     * For data types.
+     * Static attribute for public modifier.
      */
+    public static final String PUBLIC = "public";
+
+    /**
+     * Static attribute for protected modifier.
+     */
+    public static final String PROTECTED = "protected";
+
     /**
      * Void java type.
      */
@@ -231,71 +518,230 @@
     /**
      * List of keywords in java, this is used for checking if the input does not contain these keywords.
      */
-    public static final List JAVA_KEY_WORDS = Arrays.asList("abstract", "assert", "boolean", "break", "byte", "case",
-            "catch", "char", "class", "const", "continue", "default", "do", "double", "else", "extends", "false",
-            "final", "finally", "float", "for", "goto", "if", "implements", "import", "instanceof", "int", "interface",
-            "long", "native", "new", "null", "package", "private", "protected", "public", "return", "short", "static",
-            "strictfp", "super", "switch", "synchronized", "this", "throw", "throws", "transient", "true", "try",
-            "void", "volatile", "while");
+    public static final List<String> JAVA_KEY_WORDS = Arrays.asList(
+            "abstract", "assert", "boolean", "break", "byte", "case", "catch", "char", "class", "const", "continue",
+            "default", "do", "double", "else", "extends", "false", "final", "finally", "float", "for", "goto", "if",
+            "implements", "import", "instanceof", "int", "interface", "long", "native", "new", "null", "package",
+            "private", "protected", "public", "return", "short", "static", "strictfp", "super", "switch",
+            "synchronized", "this", "throw", "throws", "transient", "true", "try", "void", "volatile", "while");
 
     /**
-     * Defining regular expression.
+     * Static attribute for regex for special char.
      */
     public static final String REGEX_WITH_SPECIAL_CHAR = "[ : / - @ $ # ' * + , ; = ]+";
+
+    /**
+     * Static attribute for regex for digits.
+     */
     public static final String REGEX_FOR_FIRST_DIGIT = "\\d.*";
 
     /**
-     * For identifiers.
+     * Static attribute for class syntax.
      */
     public static final String CLASS = "class";
-    public static final String BUILDER = "Builder";
-    public static final String BUILDER_OBJECT = "builder object of ";
-    public static final String INTERFACE = "interface";
-    public static final String ENUM = "enum";
-    public static final String STATIC = "static";
-    public static final String FINAL = "final";
-    public static final String PACKAGE = "package";
-    public static final String IMPORT = "import ";
-    public static final String NULL = "null";
-    public static final String RETURN = "return";
-    public static final String NEW = "new";
-    public static final String THIS = "this";
-    public static final String IMPLEMENTS = "implements";
-    public static final String EXTEND = "extends";
-    public static final String IMPL = "Impl";
-    public static final String BUILD = "build";
-    public static final String OBJECT = "Object";
-    public static final String OVERRIDE = "@Override";
-    public static final String CHILDREN = "'s children";
 
     /**
-     * For collections.
+     * Static attribute for builder syntax.
+     */
+    public static final String BUILDER = "Builder";
+
+    /**
+     * Static attribute for interface syntax.
+     */
+    public static final String INTERFACE = "interface";
+
+    /**
+     * Static attribute for enum syntax.
+     */
+    public static final String ENUM = "enum";
+
+    /**
+     * Static attribute for static syntax.
+     */
+    public static final String STATIC = "static";
+
+    /**
+     * Static attribute for final syntax.
+     */
+    public static final String FINAL = "final";
+
+    /**
+     * Static attribute for package syntax.
+     */
+    public static final String PACKAGE = "package";
+
+    /**
+     * Static attribute for import syntax.
+     */
+    public static final String IMPORT = "import ";
+
+    /**
+     * Static attribute for null syntax.
+     */
+    public static final String NULL = "null";
+
+    /**
+     * Static attribute for return syntax.
+     */
+    public static final String RETURN = "return";
+
+    /**
+     * Static attribute for java new syntax.
+     */
+    public static final String NEW = "new";
+
+    /**
+     * Static attribute for this syntax.
+     */
+    public static final String THIS = "this";
+
+    /**
+     * Static attribute for implements syntax.
+     */
+    public static final String IMPLEMENTS = "implements";
+
+    /**
+     * Static attribute for extends syntax.
+     */
+    public static final String EXTEND = "extends";
+
+    /**
+     * Static attribute for impl syntax.
+     */
+    public static final String IMPL = "Impl";
+
+    /**
+     * Static attribute for build method syntax.
+     */
+    public static final String BUILD = "build";
+
+    /**
+     * Static attribute for object.
+     */
+    public static final String OBJECT = "Object";
+
+    /**
+     * Static attribute for override annotation.
+     */
+    public static final String OVERRIDE = "@Override";
+
+    /**
+     * Static attribute for new line.
      */
     public static final String COLLECTION_IMPORTS = "java.util";
+
+    /**
+     * Static attribute for more object import package.
+     */
     public static final String GOOGLE_MORE_OBJECT_IMPORT_PKG = "com.google.common.base";
+
+    /**
+     * Static attribute for more object import class.
+     */
     public static final String GOOGLE_MORE_OBJECT_IMPORT_CLASS = "MoreObjects;\n";
+
+    /**
+     * Static attribute for to string method.
+     */
     public static final String GOOGLE_MORE_OBJECT_METHOD_STRING = " MoreObjects.toStringHelper(getClass())";
+
+    /**
+     * Static attribute for java utilities import package.
+     */
     public static final String JAVA_UTIL_OBJECTS_IMPORT_PKG = "java.util";
+
+    /**
+     * Static attribute for java utilities objects import class.
+     */
     public static final String JAVA_UTIL_OBJECTS_IMPORT_CLASS = "Objects;\n";
+
+    /**
+     * Static attribute for abstract collection.
+     */
     public static final String ABSTRACT_COLLECTION = "AbstractCollection";
 
+    /**
+     * Static attribute for list.
+     */
     public static final String LIST = "List";
+
+    /**
+     * Static attribute for linked list.
+     */
     public static final String LINKED_LIST = "LinkedList";
+
+    /**
+     * Static attribute for array list.
+     */
     public static final String ARRAY_LIST = "ArrayList";
+
+    /**
+     * Static attribute for abstract list.
+     */
     public static final String ABSTRACT_LIST = "AbstractList";
+
+    /**
+     * Static attribute for abstract sequential list.
+     */
     public static final String ABSTRACT_SEQUENTAIL_LIST = "AbstractSequentialList";
 
+    /**
+     * Static attribute for set.
+     */
     public static final String SET = "Set";
+
+    /**
+     * Static attribute for hash set.
+     */
     public static final String HASH_SET = "HashSet";
+
+    /**
+     * Static attribute for abstract set.
+     */
     public static final String ABSTRACT_SET = "AbstractSet";
+
+    /**
+     * Static attribute for linked has set.
+     */
     public static final String LINKED_HASH_SET = "LinkedHashSet";
+
+    /**
+     * Static attribute for tree set.
+     */
     public static final String TREE_SET = "TreeSet";
 
+    /**
+     * Static attribute for map.
+     */
     public static final String MAP = "Map";
+
+    /**
+     * Static attribute for abstract map.
+     */
     public static final String ABSTRACT_MAP = "AbstractMap";
+
+    /**
+     * Static attribute for hash map.
+     */
     public static final String HASH_MAP = "HashMap";
+
+    /**
+     * Static attribute for tree map.
+     */
     public static final String TREE_MAP = "TreeMap";
+
+    /**
+     * Static attribute for concurrent map.
+     */
     public static final String CONCURRENT_MAP = "ConcurrentMap";
+
+    /**
+     * Static attribute for eventually consistent map.
+     */
     public static final String EVENTUALLY_CONSISTENT_MAP = "EventuallyConsitentMap";
+
+    /**
+     * Static attribute for stack syntax.
+     */
     public static final String STACK = "stack";
 }