@Override
 public int hashCode() {
   final int prime = 31;
   int result = 1;
   result = prime * result + ((_nodeKey == null) ? 0 : Arrays.hashCode(_nodeKey.getEncoded()));
   result = prime * result + ((_nodeName == null) ? 0 : _nodeName.hashCode());
   result = prime * result + Arrays.hashCode(_storedNodeKeyID);
   result = prime * result + ((_storedNodeKeyName == null) ? 0 : _storedNodeKeyName.hashCode());
   return result;
 }