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EventListenerProxy.java
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75 lines (70 loc) · 1.76 KB
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/*
* Copyright (c) 2000, 2004, Oracle and/or its affiliates. All rights reserved.
* ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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package java.util;
/**
* An abstract wrapper class for an {@code 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.
* <p>
* For example, a bean which supports named properties
* would have a two argument method signature for adding
* a {@code PropertyChangeListener} for a property:
* <pre>
* public void addPropertyChangeListener(String propertyName,
* PropertyChangeListener listener)
* </pre>
* If the bean also implemented the zero argument get listener method:
* <pre>
* public PropertyChangeListener[] getPropertyChangeListeners()
* </pre>
* then the array may contain inner {@code PropertyChangeListeners}
* which are also {@code PropertyChangeListenerProxy} objects.
* <p>
* 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
*/
public abstract class EventListenerProxy<T extends EventListener>
implements EventListener {
private final T listener;
/**
* Creates a proxy for the specified listener.
*
* @param listener the listener object
*/
public EventListenerProxy(T listener) {
this.listener = listener;
}
/**
* Returns the listener associated with the proxy.
*
* @return the listener associated with the proxy
*/
public T getListener() {
return this.listener;
}
}