Module java.base
Package java.util

Class EventListenerProxy<T extends EventListener>

Type Parameters:
T - the type of EventListener being wrapped
All Implemented Interfaces:
Direct Known Subclasses:
AWTEventListenerProxy, PropertyChangeListenerProxy, VetoableChangeListenerProxy

public abstract class EventListenerProxy<T extends EventListener> extends Object implements EventListener
An abstract wrapper class for an EventListener class which associates a set of additional parameters with the listener. Subclasses must provide the storage and accessor methods for the additional arguments or parameters.

For example, a bean which supports named properties would have a two argument method signature for adding a PropertyChangeListener for a property:

 public void addPropertyChangeListener(String propertyName,
                                       PropertyChangeListener listener)
If the bean also implemented the zero argument get listener method:
 public PropertyChangeListener[] getPropertyChangeListeners()
then the array may contain inner PropertyChangeListeners which are also PropertyChangeListenerProxy objects.

If the calling method is interested in retrieving the named property then it would have to test the element to see if it is a proxy class.

  • Constructor Details

    • EventListenerProxy

      public EventListenerProxy(T listener)
      Creates a proxy for the specified listener.
      listener - the listener object
  • Method Details

    • getListener

      public T getListener()
      Returns the listener associated with the proxy.
      the listener associated with the proxy