public void addNotifier(final DSSNotifier dssNotifier){
  if (!notifiers.contains(dssNotifier)) {
    LOG.trace(">>> NOTIFIER ADDED: " + dssNotifier);
    notifiers.add(dssNotifier);
  }
}

public void addNotifier ( final DSSNotifier dssNotifier ) { if ( ! notifiers . contains ( dssNotifier ) ) { LOG . trace ( ">>> NOTIFIER ADDED: " + dssNotifier ) ; notifiers . add ( dssNotifier ) ; } }
this method allows to declare a new object to be notified if any properties have changed .
