/*
 * Copyright (c) 2000, 2004, Oracle and/or its affiliates. All rights reserved.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
 * by Oracle in the LICENSE file that accompanied this code.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 */

package java.util;

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/**
 * 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.
Params:
listener –  the listener object/**
     * 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.
Returns:
 the listener associated with the proxy/**
     * Returns the listener associated with the proxy.
     *
     * @return  the listener associated with the proxy
     */
    public T getListener() {
        return this.listener;
    }
}