[ONOS-5003][ONOS-5004][ONOS-5005]Generated Code modification for YangUtils+added interface for augmentation method and other api changes.

Change-Id: I954b9c99e182f21d01fcc5cd76fbac7d61a6c3aa
diff --git a/plugin/src/main/java/org/onosproject/yangutils/utils/io/impl/FileSystemUtil.java b/plugin/src/main/java/org/onosproject/yangutils/utils/io/impl/FileSystemUtil.java
index fae08ed..1b58c0f 100644
--- a/plugin/src/main/java/org/onosproject/yangutils/utils/io/impl/FileSystemUtil.java
+++ b/plugin/src/main/java/org/onosproject/yangutils/utils/io/impl/FileSystemUtil.java
@@ -44,16 +44,13 @@
     }
 
     /**
-     * Reads the contents from source file and append its contents to append
-     * file.
+     * Reads the contents from source file and append its contents to append file.
      *
-     * @param toAppend destination file in which the contents of source file is
-     *                 appended
-     * @param srcFile  source file from which data is read and added to to append
-     *                 file
+     * @param toAppend destination file in which the contents of source file is appended
+     * @param srcFile  source file from which data is read and added to to append file
      * @throws IOException any IO errors
      */
-    public static void appendFileContents(File toAppend, File srcFile)
+    static void appendFileContents(File toAppend, File srcFile)
             throws IOException {
         updateFileHandle(srcFile, NEW_LINE + readAppendFile(toAppend.toString(), FOUR_SPACE_INDENTATION), false);
     }
@@ -76,14 +73,21 @@
             String line = bufferReader.readLine();
 
             while (line != null) {
-                if (line.equals(SPACE) || line.equals(EMPTY_STRING) || line.equals(EIGHT_SPACE_INDENTATION)
-                        || line.equals(MULTIPLE_NEW_LINE)) {
-                    stringBuilder.append(NEW_LINE);
-                } else if (line.equals(FOUR_SPACE_INDENTATION)) {
-                    stringBuilder.append(EMPTY_STRING);
-                } else {
-                    stringBuilder.append(spaces + line);
-                    stringBuilder.append(NEW_LINE);
+                switch (line) {
+                    case SPACE:
+                    case EMPTY_STRING:
+                    case EIGHT_SPACE_INDENTATION:
+                    case MULTIPLE_NEW_LINE:
+                        stringBuilder.append(NEW_LINE);
+                        break;
+                    case FOUR_SPACE_INDENTATION:
+                        stringBuilder.append(EMPTY_STRING);
+                        break;
+                    default:
+                        String append = spaces + line;
+                        stringBuilder.append(append);
+                        stringBuilder.append(NEW_LINE);
+                        break;
                 }
                 line = bufferReader.readLine();
             }
@@ -100,10 +104,10 @@
      * @param inputFile        input file
      * @param contentTobeAdded content to be appended to the file
      * @param isClose          when close of file is called.
-     * @throws IOException if the named file exists but is a directory rather than a regular file,
-     *                     does not exist but cannot be created, or cannot be opened for any other reason
+     * @throws IOException if the named file exists but is a directory rather than a regular file, does not exist but
+     *                     cannot be created, or cannot be opened for any other reason
      */
-    public static void updateFileHandle(File inputFile, String contentTobeAdded, boolean isClose)
+    static void updateFileHandle(File inputFile, String contentTobeAdded, boolean isClose)
             throws IOException {
 
         List<FileWriter> fileWriterStore = new ArrayList<>();
@@ -119,7 +123,6 @@
             for (FileWriter curWriter : fileWriterStore) {
                 curWriter.flush();
                 curWriter.close();
-                curWriter = null;
             }
         }
     }
@@ -137,7 +140,10 @@
         if (file != null) {
             updateFileHandle(file, null, true);
             if (toBeDeleted) {
-                file.delete();
+                boolean deleted = file.delete();
+                if (!deleted) {
+                    throw new IOException("Failed to delete temporary file " + file.getName());
+                }
             }
         }
     }
diff --git a/plugin/src/main/java/org/onosproject/yangutils/utils/io/impl/JavaDocGen.java b/plugin/src/main/java/org/onosproject/yangutils/utils/io/impl/JavaDocGen.java
index a674f17..3b47386 100644
--- a/plugin/src/main/java/org/onosproject/yangutils/utils/io/impl/JavaDocGen.java
+++ b/plugin/src/main/java/org/onosproject/yangutils/utils/io/impl/JavaDocGen.java
@@ -19,17 +19,12 @@
 import org.onosproject.yangutils.datamodel.javadatamodel.YangPluginConfig;
 
 import static org.onosproject.yangutils.utils.UtilConstants.AUGMENTED;
-import static org.onosproject.yangutils.utils.UtilConstants.JAVA_DOC_FOR_VALIDATOR;
-import static org.onosproject.yangutils.utils.UtilConstants.JAVA_DOC_FOR_VALIDATOR_RETURN;
-import static org.onosproject.yangutils.utils.UtilConstants.MAX_RANGE;
-import static org.onosproject.yangutils.utils.UtilConstants.MIN_RANGE;
-import static org.onosproject.yangutils.utils.UtilConstants.YANG_AUGMENTED_INFO;
 import static org.onosproject.yangutils.utils.UtilConstants.BUILDER;
 import static org.onosproject.yangutils.utils.UtilConstants.BUILDER_CLASS_JAVA_DOC;
-import static org.onosproject.yangutils.utils.UtilConstants.OP_PARAM_JAVA_DOC;
 import static org.onosproject.yangutils.utils.UtilConstants.BUILDER_INTERFACE_JAVA_DOC;
 import static org.onosproject.yangutils.utils.UtilConstants.BUILDER_OBJECT;
 import static org.onosproject.yangutils.utils.UtilConstants.CLASS;
+import static org.onosproject.yangutils.utils.UtilConstants.EIGHT_SPACE_INDENTATION;
 import static org.onosproject.yangutils.utils.UtilConstants.EMPTY_STRING;
 import static org.onosproject.yangutils.utils.UtilConstants.ENUM_ATTRIBUTE_JAVADOC;
 import static org.onosproject.yangutils.utils.UtilConstants.ENUM_CLASS_JAVADOC;
@@ -38,15 +33,17 @@
 import static org.onosproject.yangutils.utils.UtilConstants.FOUR_SPACE_INDENTATION;
 import static org.onosproject.yangutils.utils.UtilConstants.FROM_STRING_METHOD_NAME;
 import static org.onosproject.yangutils.utils.UtilConstants.FROM_STRING_PARAM_NAME;
-import static org.onosproject.yangutils.utils.UtilConstants.IMPL;
 import static org.onosproject.yangutils.utils.UtilConstants.IMPL_CLASS_JAVA_DOC;
 import static org.onosproject.yangutils.utils.UtilConstants.INPUT;
 import static org.onosproject.yangutils.utils.UtilConstants.INTERFACE_JAVA_DOC;
+import static org.onosproject.yangutils.utils.UtilConstants.JAVA_DOC_ADD_TO_LIST;
 import static org.onosproject.yangutils.utils.UtilConstants.JAVA_DOC_BUILD;
 import static org.onosproject.yangutils.utils.UtilConstants.JAVA_DOC_BUILD_RETURN;
 import static org.onosproject.yangutils.utils.UtilConstants.JAVA_DOC_CONSTRUCTOR;
 import static org.onosproject.yangutils.utils.UtilConstants.JAVA_DOC_END_LINE;
 import static org.onosproject.yangutils.utils.UtilConstants.JAVA_DOC_FIRST_LINE;
+import static org.onosproject.yangutils.utils.UtilConstants.JAVA_DOC_FOR_VALIDATOR;
+import static org.onosproject.yangutils.utils.UtilConstants.JAVA_DOC_FOR_VALIDATOR_RETURN;
 import static org.onosproject.yangutils.utils.UtilConstants.JAVA_DOC_GETTERS;
 import static org.onosproject.yangutils.utils.UtilConstants.JAVA_DOC_MANAGER_SETTERS;
 import static org.onosproject.yangutils.utils.UtilConstants.JAVA_DOC_OF;
@@ -57,11 +54,14 @@
 import static org.onosproject.yangutils.utils.UtilConstants.JAVA_DOC_SETTERS_COMMON;
 import static org.onosproject.yangutils.utils.UtilConstants.LIST;
 import static org.onosproject.yangutils.utils.UtilConstants.MAP;
+import static org.onosproject.yangutils.utils.UtilConstants.MAX_RANGE;
+import static org.onosproject.yangutils.utils.UtilConstants.MIN_RANGE;
 import static org.onosproject.yangutils.utils.UtilConstants.NEW_LINE;
 import static org.onosproject.yangutils.utils.UtilConstants.NEW_LINE_ASTERISK;
 import static org.onosproject.yangutils.utils.UtilConstants.OBJECT;
 import static org.onosproject.yangutils.utils.UtilConstants.OBJECT_STRING;
 import static org.onosproject.yangutils.utils.UtilConstants.OF;
+import static org.onosproject.yangutils.utils.UtilConstants.OP_PARAM_JAVA_DOC;
 import static org.onosproject.yangutils.utils.UtilConstants.PACKAGE_INFO_JAVADOC;
 import static org.onosproject.yangutils.utils.UtilConstants.PACKAGE_INFO_JAVADOC_OF_CHILD;
 import static org.onosproject.yangutils.utils.UtilConstants.PERIOD;
@@ -71,6 +71,7 @@
 import static org.onosproject.yangutils.utils.UtilConstants.STRING_DATA_TYPE;
 import static org.onosproject.yangutils.utils.UtilConstants.VALUE;
 import static org.onosproject.yangutils.utils.UtilConstants.VOID;
+import static org.onosproject.yangutils.utils.UtilConstants.YANG_AUGMENTED_INFO;
 import static org.onosproject.yangutils.utils.io.impl.YangIoUtils.getCamelCase;
 import static org.onosproject.yangutils.utils.io.impl.YangIoUtils.getSmallCase;
 
@@ -92,7 +93,7 @@
      * @param name         name of the YangNode
      * @param isList       is list attribute
      * @param pluginConfig plugin configurations
-     * @return javadocs.
+     * @return javaDocs.
      */
     public static String getJavaDoc(JavaDocType type, String name, boolean isList, YangPluginConfig pluginConfig) {
 
@@ -167,6 +168,9 @@
             case EVENT_SUBJECT_CLASS: {
                 return generateForClass(name);
             }
+            case ADD_TO_LIST: {
+                return generateForAddToList(name);
+            }
             default: {
                 return generateForConstructors(name);
             }
@@ -180,8 +184,8 @@
      * @return javaDocs
      */
     private static String generateForEnumAttr(String name) {
-        return NEW_LINE + FOUR_SPACE_INDENTATION + JAVA_DOC_FIRST_LINE + FOUR_SPACE_INDENTATION + ENUM_ATTRIBUTE_JAVADOC
-                + name + PERIOD + NEW_LINE + FOUR_SPACE_INDENTATION + JAVA_DOC_END_LINE;
+        return EIGHT_SPACE_INDENTATION + JAVA_DOC_FIRST_LINE + EIGHT_SPACE_INDENTATION + ENUM_ATTRIBUTE_JAVADOC
+                + name + PERIOD + NEW_LINE + EIGHT_SPACE_INDENTATION + JAVA_DOC_END_LINE;
     }
 
     /**
@@ -438,11 +442,11 @@
     /**
      * Generates javaDoc for the builder interface.
      *
-     * @param builderforName builder for name
+     * @param builderForName builder for name
      * @return javaDocs
      */
-    private static String generateForBuilderInterface(String builderforName) {
-        return JAVA_DOC_FIRST_LINE + BUILDER_INTERFACE_JAVA_DOC + builderforName + PERIOD + NEW_LINE
+    private static String generateForBuilderInterface(String builderForName) {
+        return JAVA_DOC_FIRST_LINE + BUILDER_INTERFACE_JAVA_DOC + builderForName + PERIOD + NEW_LINE
                 + JAVA_DOC_END_LINE;
     }
 
@@ -480,7 +484,7 @@
      */
     private static String generateForConstructors(String className) {
         return NEW_LINE + FOUR_SPACE_INDENTATION + JAVA_DOC_FIRST_LINE + FOUR_SPACE_INDENTATION + JAVA_DOC_CONSTRUCTOR
-                + className + IMPL + PERIOD + NEW_LINE + FOUR_SPACE_INDENTATION + NEW_LINE_ASTERISK
+                + className + PERIOD + NEW_LINE + FOUR_SPACE_INDENTATION + NEW_LINE_ASTERISK
                 + FOUR_SPACE_INDENTATION + JAVA_DOC_PARAM + BUILDER.toLowerCase() + OBJECT + SPACE + BUILDER_OBJECT
                 + className + NEW_LINE + FOUR_SPACE_INDENTATION + JAVA_DOC_END_LINE;
     }
@@ -504,7 +508,7 @@
      * @param attribute attribute string
      * @return javaDocs for type constructor
      */
-    public static String generateForTypeConstructor(String attribute) {
+    private static String generateForTypeConstructor(String attribute) {
         return NEW_LINE + FOUR_SPACE_INDENTATION + JAVA_DOC_FIRST_LINE + FOUR_SPACE_INDENTATION + JAVA_DOC_CONSTRUCTOR
                 + attribute + PERIOD + NEW_LINE + FOUR_SPACE_INDENTATION + NEW_LINE_ASTERISK + FOUR_SPACE_INDENTATION
                 + JAVA_DOC_PARAM + VALUE + SPACE + VALUE + SPACE + OF + SPACE + attribute + NEW_LINE
@@ -557,6 +561,52 @@
     }
 
     /**
+     * Generates javaDocs for type constructor.
+     *
+     * @param attribute attribute string
+     * @return javaDocs for type constructor
+     */
+    public static String generateForGetMethodWithAttribute(String attribute) {
+        return NEW_LINE + FOUR_SPACE_INDENTATION + JAVA_DOC_FIRST_LINE + FOUR_SPACE_INDENTATION + JAVA_DOC_GETTERS
+                + attribute + PERIOD + NEW_LINE + FOUR_SPACE_INDENTATION + NEW_LINE_ASTERISK + FOUR_SPACE_INDENTATION
+                + JAVA_DOC_PARAM + attribute + SPACE + VALUE + SPACE + OF + SPACE + attribute + NEW_LINE
+                + FOUR_SPACE_INDENTATION + JAVA_DOC_RETURN + VALUE + SPACE + OF + SPACE + attribute + NEW_LINE
+                + FOUR_SPACE_INDENTATION + JAVA_DOC_END_LINE;
+    }
+
+    /**
+     * Returns javaDocs for add to list method.
+     *
+     * @param attribute attribute
+     * @return javaDocs
+     */
+    private static String generateForAddToList(String attribute) {
+        String javadoc = NEW_LINE + FOUR_SPACE_INDENTATION + JAVA_DOC_FIRST_LINE + FOUR_SPACE_INDENTATION
+                + JAVA_DOC_ADD_TO_LIST + attribute + PERIOD + NEW_LINE + FOUR_SPACE_INDENTATION + NEW_LINE_ASTERISK
+                + FOUR_SPACE_INDENTATION + JAVA_DOC_PARAM + VALUE + SPACE;
+        javadoc = javadoc + VALUE + SPACE + OF + SPACE;
+        javadoc = javadoc + attribute + NEW_LINE + FOUR_SPACE_INDENTATION + JAVA_DOC_END_LINE;
+        return javadoc;
+    }
+
+    /**
+     * Generates for builder method.
+     *
+     * @param attribute attribute
+     * @return javaDocs
+     */
+    public static String generateForBuilderMethod(String attribute) {
+
+        String javadoc = FOUR_SPACE_INDENTATION + JAVA_DOC_FIRST_LINE + FOUR_SPACE_INDENTATION
+                + JAVA_DOC_GETTERS + attribute + BUILDER + PERIOD + NEW_LINE + FOUR_SPACE_INDENTATION
+                + NEW_LINE_ASTERISK + FOUR_SPACE_INDENTATION + JAVA_DOC_RETURN;
+        javadoc = javadoc + VALUE + SPACE + OF + SPACE;
+        javadoc = javadoc + attribute + BUILDER + NEW_LINE + FOUR_SPACE_INDENTATION + JAVA_DOC_END_LINE;
+        return javadoc;
+    }
+
+
+    /**
      * JavaDocs types.
      */
     public enum JavaDocType {
@@ -679,6 +729,12 @@
         /**
          * For operation builder.
          */
-        OPERATION_BUILDER_CLASS
+        OPERATION_BUILDER_CLASS,
+
+        /**
+         * For add to list.
+         */
+        ADD_TO_LIST,
     }
+
 }
diff --git a/plugin/src/main/java/org/onosproject/yangutils/utils/io/impl/YangFileScanner.java b/plugin/src/main/java/org/onosproject/yangutils/utils/io/impl/YangFileScanner.java
index ff2e3e7..b5f5fca 100644
--- a/plugin/src/main/java/org/onosproject/yangutils/utils/io/impl/YangFileScanner.java
+++ b/plugin/src/main/java/org/onosproject/yangutils/utils/io/impl/YangFileScanner.java
@@ -27,8 +27,8 @@
  */
 public final class YangFileScanner {
 
-    private static final String JAVA_FILE_EXTENTION = ".java";
-    private static final String YANG_FILE_EXTENTION = ".yang";
+    private static final String JAVA_FILE_EXTENSION = ".java";
+    private static final String YANG_FILE_EXTENSION = ".yang";
 
     /**
      * Creates an instance of YANG file scanner.
@@ -45,9 +45,8 @@
      * @throws IOException          when files get deleted while performing the
      *                              operations
      */
-    public static List<String> getJavaFiles(String root) throws IOException {
-
-        return getFiles(root, JAVA_FILE_EXTENTION);
+    static List<String> getJavaFiles(String root) throws IOException {
+        return getFiles(root, JAVA_FILE_EXTENSION);
     }
 
     /**
@@ -60,8 +59,7 @@
      *                              operations
      */
     public static List<String> getYangFiles(String root) throws IOException {
-
-        return getFiles(root, YANG_FILE_EXTENTION);
+        return getFiles(root, YANG_FILE_EXTENSION);
     }
 
     /**
@@ -73,22 +71,22 @@
      * @throws NullPointerException when no file is there
      * @throws IOException          when files get deleted while performing the operations
      */
-    public static List<String> getFiles(String root, String extension) throws IOException {
+    private static List<String> getFiles(String root, String extension) throws IOException {
 
         List<String> store = new LinkedList<>();
         Stack<String> stack = new Stack<>();
         stack.push(root);
         File file;
-        File[] filelist;
+        File[] fileList;
         try {
             while (!stack.empty()) {
                 root = stack.pop();
                 file = new File(root);
-                filelist = file.listFiles();
-                if ((filelist == null) || (filelist.length == 0)) {
+                fileList = file.listFiles();
+                if ((fileList == null) || (fileList.length == 0)) {
                     continue;
                 }
-                for (File current : filelist) {
+                for (File current : fileList) {
                     if (current.isDirectory()) {
                         stack.push(current.toString());
                     } else {
diff --git a/plugin/src/main/java/org/onosproject/yangutils/utils/io/impl/YangIoUtils.java b/plugin/src/main/java/org/onosproject/yangutils/utils/io/impl/YangIoUtils.java
index 0c6b51e..7b91ae9 100644
--- a/plugin/src/main/java/org/onosproject/yangutils/utils/io/impl/YangIoUtils.java
+++ b/plugin/src/main/java/org/onosproject/yangutils/utils/io/impl/YangIoUtils.java
@@ -62,6 +62,7 @@
 import static org.onosproject.yangutils.utils.UtilConstants.TWELVE_SPACE_INDENTATION;
 import static org.onosproject.yangutils.utils.UtilConstants.UNDER_SCORE;
 import static org.onosproject.yangutils.utils.UtilConstants.YANG_AUTO_PREFIX;
+import static org.onosproject.yangutils.utils.io.impl.CopyrightHeader.getCopyrightHeader;
 import static org.onosproject.yangutils.utils.io.impl.FileSystemUtil.appendFileContents;
 import static org.onosproject.yangutils.utils.io.impl.FileSystemUtil.updateFileHandle;
 import static org.onosproject.yangutils.utils.io.impl.JavaDocGen.JavaDocType.PACKAGE_INFO;
@@ -87,10 +88,16 @@
      *
      * @param path directory path
      * @return directory structure
+     * @throws IOException when fails to do IO operations
      */
-    public static File createDirectories(String path) {
+    public static File createDirectories(String path) throws IOException {
         File generatedDir = new File(path);
-        generatedDir.mkdirs();
+        if (!generatedDir.exists()) {
+            boolean isGenerated = generatedDir.mkdirs();
+            if (!isGenerated) {
+                throw new IOException("failed to generated directory " + path);
+            }
+        }
         return generatedDir;
     }
 
@@ -113,22 +120,26 @@
         try {
 
             File packageInfo = new File(path + SLASH + "package-info.java");
-            packageInfo.createNewFile();
-
+            if (!packageInfo.exists()) {
+                boolean isGenerated = packageInfo.createNewFile();
+                if (!isGenerated) {
+                    throw new IOException("failed to generated package-info " + path);
+                }
+            }
             FileWriter fileWriter = new FileWriter(packageInfo);
             BufferedWriter bufferedWriter = new BufferedWriter(fileWriter);
 
-            bufferedWriter.write(CopyrightHeader.getCopyrightHeader());
+            bufferedWriter.write(getCopyrightHeader());
             bufferedWriter.write(getJavaDoc(PACKAGE_INFO, classInfo, isChildNode, pluginConfig));
             String pkg = PACKAGE + SPACE + pack + SEMI_COLAN;
             if (pkg.length() > LINE_SIZE) {
-                pkg = whenDelimiterIsPersent(pkg, LINE_SIZE);
+                pkg = whenDelimiterIsPresent(pkg, LINE_SIZE);
             }
             bufferedWriter.write(pkg);
             bufferedWriter.close();
             fileWriter.close();
         } catch (IOException e) {
-            throw new IOException("Exception occured while creating package info file.");
+            throw new IOException("Exception occurred while creating package info file.");
         }
     }
 
@@ -192,11 +203,11 @@
         while (!stack.empty()) {
             root = stack.pop();
             File file = new File(root);
-            File[] filelist = file.listFiles();
-            if (filelist == null || filelist.length == 0) {
+            File[] fileList = file.listFiles();
+            if (fileList == null || fileList.length == 0) {
                 continue;
             }
-            for (File current : filelist) {
+            for (File current : fileList) {
                 if (current.isDirectory()) {
                     stack.push(current.toString());
                     if (current.getName().endsWith("-Temp")) {
@@ -215,12 +226,12 @@
      * Removes extra char from the string.
      *
      * @param valueString   string to be trimmed
-     * @param removalStirng extra chars
+     * @param removalString extra chars
      * @return new string
      */
-    public static String trimAtLast(String valueString, String removalStirng) {
+    public static String trimAtLast(String valueString, String removalString) {
         StringBuilder stringBuilder = new StringBuilder(valueString);
-        int index = valueString.lastIndexOf(removalStirng);
+        int index = valueString.lastIndexOf(removalString);
         if (index != -1) {
             stringBuilder.deleteCharAt(index);
         }
@@ -302,9 +313,9 @@
      */
     public static File validateLineLength(File dataFile)
             throws IOException {
-        File tempFile = dataFile;
         FileReader fileReader = new FileReader(dataFile);
         BufferedReader bufferReader = new BufferedReader(fileReader);
+        String append;
         try {
             StringBuilder stringBuilder = new StringBuilder();
             String line = bufferReader.readLine();
@@ -312,20 +323,21 @@
             while (line != null) {
                 if (line.length() > LINE_SIZE) {
                     if (line.contains(PERIOD)) {
-                        line = whenDelimiterIsPersent(line, LINE_SIZE);
+                        line = whenDelimiterIsPresent(line, LINE_SIZE);
                     } else if (line.contains(SPACE)) {
                         line = whenSpaceIsPresent(line, LINE_SIZE);
                     }
                     stringBuilder.append(line);
                 } else {
-                    stringBuilder.append(line + NEW_LINE);
+                    append = line + NEW_LINE;
+                    stringBuilder.append(append);
                 }
                 line = bufferReader.readLine();
             }
-            FileWriter writer = new FileWriter(tempFile);
+            FileWriter writer = new FileWriter(dataFile);
             writer.write(stringBuilder.toString());
             writer.close();
-            return tempFile;
+            return dataFile;
         } finally {
             fileReader.close();
             bufferReader.close();
@@ -333,14 +345,15 @@
     }
 
     /* When delimiters are present in the given line. */
-    private static String whenDelimiterIsPersent(String line, int lineSize) {
+    private static String whenDelimiterIsPresent(String line, int lineSize) {
         StringBuilder stringBuilder = new StringBuilder();
-
+        String append;
         if (line.length() > lineSize) {
             String[] strArray = line.split(Pattern.quote(PERIOD));
             stringBuilder = updateString(strArray, stringBuilder, PERIOD, lineSize);
         } else {
-            stringBuilder.append(line + NEW_LINE);
+            append = line + NEW_LINE;
+            stringBuilder.append(append);
         }
         String[] strArray = stringBuilder.toString().split(NEW_LINE);
         StringBuilder tempBuilder = new StringBuilder();
@@ -353,7 +366,8 @@
                     tempBuilder.append(whenSpaceIsPresent(str, SUB_LINE_SIZE));
                 }
             } else {
-                tempBuilder.append(str + NEW_LINE);
+                append = str + NEW_LINE;
+                tempBuilder.append(append);
             }
         }
         return tempBuilder.toString();
@@ -363,11 +377,13 @@
     /* When spaces are present in the given line. */
     private static String whenSpaceIsPresent(String line, int lineSize) {
         StringBuilder stringBuilder = new StringBuilder();
+        String append;
         if (line.length() > lineSize) {
             String[] strArray = line.split(SPACE);
             stringBuilder = updateString(strArray, stringBuilder, SPACE, lineSize);
         } else {
-            stringBuilder.append(line + NEW_LINE);
+            append = line + NEW_LINE;
+            stringBuilder.append(append);
         }
 
         String[] strArray = stringBuilder.toString().split(NEW_LINE);
@@ -379,7 +395,8 @@
                     tempBuilder = updateString(strArr, tempBuilder, SPACE, SUB_LINE_SIZE);
                 }
             } else {
-                tempBuilder.append(str + NEW_LINE);
+                append = str + NEW_LINE;
+                tempBuilder.append(append);
             }
         }
         return tempBuilder.toString();
@@ -390,28 +407,34 @@
                                               int lineSize) {
 
         StringBuilder tempBuilder = new StringBuilder();
+        String append;
         for (String str : strArray) {
-            tempBuilder.append(str + string);
+            append = str + string;
+            tempBuilder.append(append);
             if (tempBuilder.length() > lineSize) {
                 String tempString = stringBuilder.toString();
                 stringBuilder.delete(ZERO, stringBuilder.length());
                 tempString = trimAtLast(tempString, string);
                 stringBuilder.append(tempString);
                 if (string.equals(PERIOD)) {
-                    stringBuilder.append(NEW_LINE + TWELVE_SPACE_INDENTATION + PERIOD + str + string);
+                    append = NEW_LINE + TWELVE_SPACE_INDENTATION + PERIOD + str + string;
+                    stringBuilder.append(append);
                 } else {
-                    stringBuilder.append(NEW_LINE + TWELVE_SPACE_INDENTATION + str + string);
+                    append = NEW_LINE + TWELVE_SPACE_INDENTATION + str + string;
+                    stringBuilder.append(append);
                 }
                 tempBuilder.delete(ZERO, tempBuilder.length());
                 tempBuilder.append(TWELVE_SPACE_INDENTATION);
             } else {
-                stringBuilder.append(str + string);
+                append = str + string;
+                stringBuilder.append(append);
             }
         }
         String tempString = stringBuilder.toString();
         tempString = trimAtLast(tempString, string);
         stringBuilder.delete(ZERO, stringBuilder.length());
-        stringBuilder.append(tempString + NEW_LINE);
+        append = tempString + NEW_LINE;
+        stringBuilder.append(append);
         return stringBuilder;
     }
 
@@ -464,7 +487,7 @@
      * @param consecCapitalCaseRemover which requires the restriction of consecutive capital case
      * @return string without consecutive capital case
      */
-    public static String restrictConsecutiveCapitalCase(String consecCapitalCaseRemover) {
+    private static String restrictConsecutiveCapitalCase(String consecCapitalCaseRemover) {
 
         for (int k = 0; k < consecCapitalCaseRemover.length(); k++) {
             if (k + 1 < consecCapitalCaseRemover.length()) {
@@ -487,7 +510,7 @@
      * @param conflictResolver object of YANG to java naming conflict util
      * @return prefixed camel case string
      */
-    public static String addPrefix(String camelCasePrefix, YangToJavaNamingConflictUtil conflictResolver) {
+    private static String addPrefix(String camelCasePrefix, YangToJavaNamingConflictUtil conflictResolver) {
 
         String prefix = getPrefixForIdentifier(conflictResolver);
         if (camelCasePrefix.matches(REGEX_FOR_FIRST_DIGIT)) {
@@ -508,7 +531,7 @@
      * @param conflictResolver object of YANG to java naming conflict util
      * @return camel case rule checked string
      */
-    public static String applyCamelCaseRule(String[] stringArray, YangToJavaNamingConflictUtil conflictResolver) {
+    private static String applyCamelCaseRule(String[] stringArray, YangToJavaNamingConflictUtil conflictResolver) {
 
         String ruleChecker = stringArray[0].toLowerCase();
         int i;
@@ -551,8 +574,8 @@
      * @param conflictResolver object of YANG to java naming conflict util
      * @return camel cased string
      */
-    public static String upperCaseConflictResolver(String[] stringArray,
-                                                   YangToJavaNamingConflictUtil conflictResolver) {
+    private static String upperCaseConflictResolver(String[] stringArray,
+                                                    YangToJavaNamingConflictUtil conflictResolver) {
 
         for (int l = 0; l < stringArray.length; l++) {
             String[] upperCaseSplitArray = stringArray[l].split(REGEX_WITH_UPPERCASE);
@@ -579,7 +602,7 @@
             }
             stringArray[l] = strBuilder.toString();
         }
-        List<String> result = new ArrayList<String>();
+        List<String> result = new ArrayList<>();
         for (String element : stringArray) {
             String[] capitalCaseSplitArray = element.split(REGEX_WITH_UPPERCASE);
             for (String letter : capitalCaseSplitArray) {
@@ -625,10 +648,8 @@
         yangIdentifier = yangIdentifier.replaceAll(REGEX_FOR_IDENTIFIER_SPECIAL_CHAR, COLAN);
         String[] strArray = yangIdentifier.split(COLAN);
         if (strArray[0].isEmpty()) {
-            List<String> stringArrangement = new ArrayList<String>();
-            for (int i = 1; i < strArray.length; i++) {
-                stringArrangement.add(strArray[i]);
-            }
+            List<String> stringArrangement = new ArrayList<>();
+            stringArrangement.addAll(Arrays.asList(strArray).subList(1, strArray.length));
             strArray = stringArrangement.toArray(new String[stringArrangement.size()]);
         }
         return upperCaseConflictResolver(strArray, conflictResolver);
@@ -651,10 +672,8 @@
             String[] strArray = prefixForIdentifier.split(COLAN);
             try {
                 if (strArray[0].isEmpty()) {
-                    List<String> stringArrangement = new ArrayList<String>();
-                    for (int i = 1; i < strArray.length; i++) {
-                        stringArrangement.add(strArray[i]);
-                    }
+                    List<String> stringArrangement = new ArrayList<>();
+                    stringArrangement.addAll(Arrays.asList(strArray).subList(1, strArray.length));
                     strArray = stringArrangement.toArray(new String[stringArrangement.size()]);
                 }
                 prefixForIdentifier = strArray[0];