@Override
 public int hashCode() {
   final int prime = 31;
   int result = super.hashCode();
   result = prime * result + ((address == null) ? 0 : address.hashCode());
   result = prime * result + ((addressOnParent == null) ? 0 : addressOnParent.hashCode());
   result = prime * result + ((resourceSubType == null) ? 0 : resourceSubType.hashCode());
   result = prime * result + ((resourceType == null) ? 0 : resourceType.hashCode());
   return result;
 }