Module java.base

Package java.util

Class EventListenerProxy<T extends EventListener>

java.lang.Object

java.util.EventListenerProxy<T>

Type Parameters:

T - the type of EventListener being wrapped

All Implemented Interfaces:

EventListener

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.

Since:

1.4

Constructor Summary

Constructors

Constructor	Description
EventListenerProxy(T listener)	Creates a proxy for the specified listener.

Method Summary

Modifier and Type	Method	Description
T	getListener()	Returns the listener associated with the proxy.

Methods declared in class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

EventListenerProxy

public EventListenerProxy(T listener)

Creates a proxy for the specified listener.

Parameters:

listener - the listener object

Method Details

getListener

public T getListener()

Returns the listener associated with the proxy.

Returns:

the listener associated with the proxy