@Override
 public boolean equals(Object obj) {
   if (this == obj) return true;
   if (!super.equals(obj)) return false;
   if (getClass() != obj.getClass()) return false;
   OffendingNodeWarning other = (OffendingNodeWarning) obj;
   if (node == null) {
     if (other.node != null) return false;
   } else if (!node.equals(other.node)) return false;
   return true;
 }