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   * 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
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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;
      }
  }
  