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/*
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* Copyright (c) 2000, 2004, Oracle and/or its affiliates. All rights reserved.
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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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jaroslav@601
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*
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* This code is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License version 2 only, as
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* published by the Free Software Foundation. Oracle designates this
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* particular file as subject to the "Classpath" exception as provided
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* by Oracle in the LICENSE file that accompanied this code.
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jaroslav@601
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*
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* This code is distributed in the hope that it will be useful, but WITHOUT
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* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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* version 2 for more details (a copy is included in the LICENSE file that
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* accompanied this code).
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jaroslav@601
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*
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* You should have received a copy of the GNU General Public License version
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* 2 along with this work; if not, write to the Free Software Foundation,
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* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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jaroslav@601
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*
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* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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* or visit www.oracle.com if you need additional information or have any
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* questions.
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*/
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package java.util;
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/**
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* An abstract wrapper class for an {@code EventListener} class
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* which associates a set of additional parameters with the listener.
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* Subclasses must provide the storage and accessor methods
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* for the additional arguments or parameters.
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* <p>
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* For example, a bean which supports named properties
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* would have a two argument method signature for adding
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* a {@code PropertyChangeListener} for a property:
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* <pre>
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* public void addPropertyChangeListener(String propertyName,
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* PropertyChangeListener listener)
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* </pre>
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* If the bean also implemented the zero argument get listener method:
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* <pre>
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* public PropertyChangeListener[] getPropertyChangeListeners()
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* </pre>
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* then the array may contain inner {@code PropertyChangeListeners}
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* which are also {@code PropertyChangeListenerProxy} objects.
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* <p>
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* If the calling method is interested in retrieving the named property
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* then it would have to test the element to see if it is a proxy class.
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*
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* @since 1.4
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*/
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public abstract class EventListenerProxy<T extends EventListener>
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implements EventListener {
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private final T listener;
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/**
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* Creates a proxy for the specified listener.
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*
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* @param listener the listener object
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*/
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public EventListenerProxy(T listener) {
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this.listener = listener;
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}
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/**
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* Returns the listener associated with the proxy.
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*
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* @return the listener associated with the proxy
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*/
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public T getListener() {
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return this.listener;
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}
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}
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