private String describe(EventListener listener) {
if (listener instanceof PropertyChangeListenerProxy) {
PropertyChangeListenerProxy proxy = (PropertyChangeListenerProxy) listener;
return proxy.getPropertyName() + " to " + describe(proxy.getListener());
} else {
return listener.toString();
}
}
public void testAddingAProxy() {
Object bean = new Object();
PropertyChangeSupport support = new PropertyChangeSupport(bean);
PropertyChangeListener listener =
new PropertyChangeListener() {
public void propertyChange(PropertyChangeEvent event) {}
};
PropertyChangeListenerProxy proxy = new PropertyChangeListenerProxy("a", listener);
support.addPropertyChangeListener("b", proxy);
// this proxy sets us up to receive 'b' events
PropertyChangeListenerProxy p1 =
(PropertyChangeListenerProxy) support.getPropertyChangeListeners()[0];
assertEquals(PropertyChangeListenerProxy.class, p1.getClass());
assertEquals("b", p1.getPropertyName());
// this proxy sets us up to receive 'a' events
PropertyChangeListenerProxy p2 = (PropertyChangeListenerProxy) p1.getListener();
assertEquals(PropertyChangeListenerProxy.class, p2.getClass());
assertEquals("a", p2.getPropertyName());
assertEquals(listener, p2.getListener());
}
public void testAddingAListenerActuallyAddsAProxy() {
Object bean = new Object();
PropertyChangeSupport support = new PropertyChangeSupport(bean);
PropertyChangeListener listener =
new PropertyChangeListener() {
public void propertyChange(PropertyChangeEvent event) {}
};
support.addPropertyChangeListener("a", listener);
PropertyChangeListenerProxy p1 =
(PropertyChangeListenerProxy) support.getPropertyChangeListeners()[0];
assertEquals(PropertyChangeListenerProxy.class, p1.getClass());
assertTrue(p1 != listener); // weird but consistent with the RI
assertEquals("a", p1.getPropertyName());
assertEquals(listener, p1.getListener());
}