Defect Fixes and optimization for YANG translator.

Change-Id: I974a968f3c41e1abea9f2567aceb3d523645d0ae
diff --git a/utils/yangutils/src/main/java/org/onosproject/yangutils/utils/io/impl/FileSystemUtil.java b/utils/yangutils/src/main/java/org/onosproject/yangutils/utils/io/impl/FileSystemUtil.java
index 3c312fb..a31bb7f 100644
--- a/utils/yangutils/src/main/java/org/onosproject/yangutils/utils/io/impl/FileSystemUtil.java
+++ b/utils/yangutils/src/main/java/org/onosproject/yangutils/utils/io/impl/FileSystemUtil.java
@@ -23,6 +23,8 @@
 import java.io.IOException;
 import java.io.PrintWriter;
 
+import static org.onosproject.yangutils.translator.tojava.utils.JavaIdentifierSyntax.getJavaPackageFromPackagePath;
+import static org.onosproject.yangutils.translator.tojava.utils.JavaIdentifierSyntax.getPackageDirPathFromJavaJPackage;
 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.FOUR_SPACE_INDENTATION;
@@ -31,8 +33,6 @@
 import static org.onosproject.yangutils.utils.UtilConstants.SLASH;
 import static org.onosproject.yangutils.utils.UtilConstants.SPACE;
 import static org.onosproject.yangutils.utils.io.impl.YangIoUtils.addPackageInfo;
-import static org.onosproject.yangutils.utils.io.impl.YangIoUtils.convertPathToPkg;
-import static org.onosproject.yangutils.utils.io.impl.YangIoUtils.convertPkgToPath;
 import static org.onosproject.yangutils.utils.io.impl.YangIoUtils.createDirectories;
 
 /**
@@ -54,7 +54,7 @@
      */
     public static boolean doesPackageExist(String pkg) {
 
-        File pkgDir = new File(convertPkgToPath(pkg));
+        File pkgDir = new File(getPackageDirPathFromJavaJPackage(pkg));
         File pkgWithFile = new File(pkgDir + SLASH + "package-info.java");
         if (pkgDir.exists() && pkgWithFile.isFile()) {
             return true;
@@ -74,7 +74,7 @@
         if (!doesPackageExist(pkg)) {
             try {
                 File pack = createDirectories(pkg);
-                addPackageInfo(pack, pkgInfo, convertPathToPkg(pkg));
+                addPackageInfo(pack, pkgInfo, getJavaPackageFromPackagePath(pkg));
             } catch (IOException e) {
                 throw new IOException("failed to create package-info file");
             }
diff --git a/utils/yangutils/src/main/java/org/onosproject/yangutils/utils/io/impl/JavaDocGen.java b/utils/yangutils/src/main/java/org/onosproject/yangutils/utils/io/impl/JavaDocGen.java
index 2c9c242..c3ff0a3 100644
--- a/utils/yangutils/src/main/java/org/onosproject/yangutils/utils/io/impl/JavaDocGen.java
+++ b/utils/yangutils/src/main/java/org/onosproject/yangutils/utils/io/impl/JavaDocGen.java
@@ -41,7 +41,7 @@
 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.NEW_LINE;
-import static org.onosproject.yangutils.utils.UtilConstants.NEW_LINE_ESTRIC;
+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.OF;
 import static org.onosproject.yangutils.utils.UtilConstants.PACKAGE_INFO_JAVADOC;
@@ -141,7 +141,7 @@
      */
     public static String getJavaDoc(JavaDocType type, String name, boolean isList) {
 
-        name = JavaIdentifierSyntax.getLowerCase(JavaIdentifierSyntax.getCamelCase(name));
+        name = JavaIdentifierSyntax.getSmallCase(JavaIdentifierSyntax.getCamelCase(name));
         String javaDoc = UtilConstants.EMPTY_STRING;
         if (type.equals(JavaDocType.IMPL_CLASS)) {
             javaDoc = generateForImplClass(name);
@@ -183,7 +183,7 @@
     private static String generateForGetters(String attribute, boolean isList) {
 
         String getter = NEW_LINE + FOUR_SPACE_INDENTATION + JAVA_DOC_FIRST_LINE + FOUR_SPACE_INDENTATION
-                + JAVA_DOC_GETTERS + attribute + PERIOD + NEW_LINE + FOUR_SPACE_INDENTATION + NEW_LINE_ESTRIC
+                + JAVA_DOC_GETTERS + attribute + PERIOD + NEW_LINE + FOUR_SPACE_INDENTATION + NEW_LINE_ASTERISK
                 + FOUR_SPACE_INDENTATION + JAVA_DOC_RETURN;
         if (isList) {
             String listAttribute = LIST.toLowerCase() + SPACE + OF + SPACE;
@@ -206,7 +206,7 @@
     private static String generateForSetters(String attribute, boolean isList) {
 
         String setter = NEW_LINE + FOUR_SPACE_INDENTATION + JAVA_DOC_FIRST_LINE + FOUR_SPACE_INDENTATION
-                + JAVA_DOC_SETTERS + attribute + PERIOD + NEW_LINE + FOUR_SPACE_INDENTATION + NEW_LINE_ESTRIC
+                + JAVA_DOC_SETTERS + attribute + PERIOD + NEW_LINE + FOUR_SPACE_INDENTATION + NEW_LINE_ASTERISK
                 + FOUR_SPACE_INDENTATION + JAVA_DOC_PARAM + attribute + SPACE;
         if (isList) {
             String listAttribute = LIST.toLowerCase() + SPACE + OF + SPACE;
@@ -228,7 +228,7 @@
     private static String generateForOf(String attribute) {
 
         return NEW_LINE + FOUR_SPACE_INDENTATION + JAVA_DOC_FIRST_LINE + FOUR_SPACE_INDENTATION + JAVA_DOC_OF
-                + attribute + PERIOD + NEW_LINE + FOUR_SPACE_INDENTATION + NEW_LINE_ESTRIC + FOUR_SPACE_INDENTATION
+                + 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
                 + FOUR_SPACE_INDENTATION + JAVA_DOC_RETURN + OBJECT + SPACE + OF + SPACE + attribute + NEW_LINE
                 + FOUR_SPACE_INDENTATION + JAVA_DOC_END_LINE;
@@ -243,7 +243,7 @@
     private static String generateForTypeDefSetter(String attribute) {
 
         return (NEW_LINE + FOUR_SPACE_INDENTATION + JAVA_DOC_FIRST_LINE + FOUR_SPACE_INDENTATION
-                + JAVA_DOC_SETTERS_COMMON + attribute + PERIOD + NEW_LINE + FOUR_SPACE_INDENTATION + NEW_LINE_ESTRIC
+                + JAVA_DOC_SETTERS_COMMON + 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 + FOUR_SPACE_INDENTATION + JAVA_DOC_END_LINE);
     }
@@ -257,7 +257,7 @@
     private static String generateForTypeDefConstructor(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_ESTRIC + FOUR_SPACE_INDENTATION
+                + 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
                 + FOUR_SPACE_INDENTATION + JAVA_DOC_END_LINE);
     }
@@ -341,8 +341,8 @@
 
         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_ESTRIC + FOUR_SPACE_INDENTATION + JAVA_DOC_PARAM
-                + BUILDER.toLowerCase() + OBJECT + SPACE + BUILDER_OBJECT + SPACE + className + 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;
     }
 
@@ -355,7 +355,7 @@
     private static String generateForBuild(String buildName) {
 
         return NEW_LINE + FOUR_SPACE_INDENTATION + JAVA_DOC_FIRST_LINE + FOUR_SPACE_INDENTATION + JAVA_DOC_BUILD
-                + buildName + PERIOD + NEW_LINE + FOUR_SPACE_INDENTATION + NEW_LINE_ESTRIC + FOUR_SPACE_INDENTATION
+                + buildName + PERIOD + NEW_LINE + FOUR_SPACE_INDENTATION + NEW_LINE_ASTERISK + FOUR_SPACE_INDENTATION
                 + JAVA_DOC_RETURN + JAVA_DOC_BUILD_RETURN + buildName + PERIOD + NEW_LINE + FOUR_SPACE_INDENTATION
                 + JAVA_DOC_END_LINE;
     }
diff --git a/utils/yangutils/src/main/java/org/onosproject/yangutils/utils/io/impl/YangFileScanner.java b/utils/yangutils/src/main/java/org/onosproject/yangutils/utils/io/impl/YangFileScanner.java
index 9de5358..bdf911a 100644
--- a/utils/yangutils/src/main/java/org/onosproject/yangutils/utils/io/impl/YangFileScanner.java
+++ b/utils/yangutils/src/main/java/org/onosproject/yangutils/utils/io/impl/YangFileScanner.java
@@ -45,7 +45,7 @@
      * @throws IOException when files get deleted while performing the
      *             operations
      */
-    public static List<String> getJavaFiles(String root) throws NullPointerException, IOException {
+    public static List<String> getJavaFiles(String root) throws IOException {
 
         return getFiles(root, JAVA_FILE_EXTENTION);
     }
@@ -59,7 +59,7 @@
      * @throws IOException when files get deleted while performing the
      *             operations
      */
-    public static List<String> getYangFiles(String root) throws NullPointerException, IOException {
+    public static List<String> getYangFiles(String root) throws IOException {
 
         return getFiles(root, YANG_FILE_EXTENTION);
     }
@@ -73,7 +73,7 @@
      * @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 NullPointerException, IOException {
+    public static List<String> getFiles(String root, String extension) throws IOException {
 
         List<String> store = new LinkedList<>();
         Stack<String> stack = new Stack<>();
@@ -100,8 +100,8 @@
                 }
             }
             return store;
-        } catch (NullPointerException e) {
-            throw new IOException("NullPointerException occured");
+        } catch (IOException e) {
+            throw new IOException("No File found of " + extension + " extension in " + root + " directory.");
         }
     }
 }
diff --git a/utils/yangutils/src/main/java/org/onosproject/yangutils/utils/io/impl/YangIoUtils.java b/utils/yangutils/src/main/java/org/onosproject/yangutils/utils/io/impl/YangIoUtils.java
index 866ff97..4a9c4d7 100644
--- a/utils/yangutils/src/main/java/org/onosproject/yangutils/utils/io/impl/YangIoUtils.java
+++ b/utils/yangutils/src/main/java/org/onosproject/yangutils/utils/io/impl/YangIoUtils.java
@@ -36,7 +36,6 @@
 import static org.onosproject.yangutils.utils.UtilConstants.NEW_LINE;
 import static org.onosproject.yangutils.utils.UtilConstants.ORG;
 import static org.onosproject.yangutils.utils.UtilConstants.PACKAGE;
-import static org.onosproject.yangutils.utils.UtilConstants.PERIOD;
 import static org.onosproject.yangutils.utils.UtilConstants.SEMI_COLAN;
 import static org.onosproject.yangutils.utils.UtilConstants.SLASH;
 import static org.onosproject.yangutils.utils.UtilConstants.SPACE;
@@ -294,26 +293,4 @@
             throw new IOException("Failed to insert in " + file + "file");
         }
     }
-
-    /**
-     * Convert directory path in java package format.
-     *
-     * @param path directory path
-     * @return java package
-     */
-    public static String convertPathToPkg(String path) {
-
-        return path.replace(SLASH, PERIOD);
-    }
-
-    /**
-     * Convert java package in directory path format.
-     *
-     * @param pkg java package
-     * @return directory path
-     */
-    public static String convertPkgToPath(String pkg) {
-
-        return pkg.replace(PERIOD, SLASH);
-    }
 }