[ONOS-5232] bits enum class generation modifications and code refactoring.

Change-Id: I67fb31c586802e9cf682aa6e707475ad8fdc096f
diff --git a/datamodel/src/main/java/org/onosproject/yangutils/datamodel/YangLengthRestriction.java b/datamodel/src/main/java/org/onosproject/yangutils/datamodel/YangLengthRestriction.java
index ed75d01..ce8fb4f 100644
--- a/datamodel/src/main/java/org/onosproject/yangutils/datamodel/YangLengthRestriction.java
+++ b/datamodel/src/main/java/org/onosproject/yangutils/datamodel/YangLengthRestriction.java
@@ -23,6 +23,8 @@
 
 import java.io.Serializable;
 
+import static org.onosproject.yangutils.datamodel.utils.YangConstructType.PATTERN_DATA;
+
 /*-
  * Reference RFC 6020.
  *
@@ -163,7 +165,7 @@
 
     @Override
     public YangConstructType getYangConstructType() {
-        return YangConstructType.PATTERN_DATA;
+        return PATTERN_DATA;
     }
 
     @Override