PropertyChangeSupport with weak references to PropertyChangeListener?

Question

Java does not seem to deliver an implementation of PropertyChangeSupport with weak references to registered PropertyChangeListeners .

It would not be very hard to implement this, but before I re-invent the wheel, does anyone know whether such feature has been implemented in any open source library? It does not seem so, but someone may know better on SO.

Answer 1

Would this Netbeans WeakListeners page help ?

Example:

public class Observer {
  private Listener listener;

  private void registerTo(Source source) {
      listener = new Listener();
      source.addChangeListener(WeakListeners.change (listener, source));
  }

  private class Listener implements ChangeListener {
      public void stateChanged(ChangeEvent e) {
          doSomething();
      }
  }
}