fix bug for yang comparator and refactor yang compiler

Issue-ID: MODELING-680
Change-Id: I3a04b24d6b02aff2a376c95d6f7508294b65aa57
Signed-off-by: frank feng <frank.fengchong@huawei.com>

1 files changed, 6 insertions, 0 deletions

diff --git a/yang-comparator/src/main/java/org/onap/modeling/yangkit/comparator/CommonYangStatementComparator.java b/yang-comparator/src/main/java/org/onap/modeling/yangkit/comparator/CommonYangStatementComparator.java
index 8b03304..8be269e 100644
--- a/yang-comparator/src/main/java/org/onap/modeling/yangkit/comparator/CommonYangStatementComparator.java
+++ b/yang-comparator/src/main/java/org/onap/modeling/yangkit/comparator/CommonYangStatementComparator.java
@@ -370,6 +370,12 @@ public class CommonYangStatementComparator<T extends YangStatement> extends Abst
      * @return true or false
      */
     public static boolean yangStatementIsEqual(YangStatement left, YangStatement right) {
+        if ((null == left) || (null == right)) {
+            if ((null == left) && (null == right)) {
+                return true;
+            }
+            return false;
+        }
         if ((left instanceof SchemaNode) && (right instanceof SchemaNode)) {
             SchemaNode leftSchemaNode = (SchemaNode) left;
             SchemaNode rightSchemaNode = (SchemaNode) right;