code: public DataModelListener[] getDataModelListeners() {
  
  	if (listeners == null) {
  	    return EMPTY_DATA_MODEL_LISTENER;
  	} else {
  	    return listeners.toArray
  		    (new DataModelListener[listeners.size()]);
  	}
  
      }
docs: <p>Return the set of {@link DataModelListener}s interested in
  notifications from this {@link DataModel}.  If there are no such
  listeners, an empty array is returned.</p>