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-/* PropertyChangeListenerProxy.java -- adds a name to a property listener
- Copyright (C) 2002, 2005 Free Software Foundation, Inc.
-
-This file is part of GNU Classpath.
-
-GNU Classpath is free software; you can redistribute it and/or modify
-it under the terms of the GNU General Public License as published by
-the Free Software Foundation; either version 2, or (at your option)
-any later version.
-
-GNU Classpath 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 for more details.
-
-You should have received a copy of the GNU General Public License
-along with GNU Classpath; see the file COPYING. If not, write to the
-Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
-02110-1301 USA.
-
-Linking this library statically or dynamically with other modules is
-making a combined work based on this library. Thus, the terms and
-conditions of the GNU General Public License cover the whole
-combination.
-
-As a special exception, the copyright holders of this library give you
-permission to link this library with independent modules to produce an
-executable, regardless of the license terms of these independent
-modules, and to copy and distribute the resulting executable under
-terms of your choice, provided that you also meet, for each linked
-independent module, the terms and conditions of the license of that
-module. An independent module is a module which is not derived from
-or based on this library. If you modify this library, you may extend
-this exception to your version of the library, but you are not
-obligated to do so. If you do not wish to do so, delete this
-exception statement from your version. */
-
-
-package java.beans;
-
-import java.util.EventListenerProxy;
-
-/**
- * This class provides an extension to <code>PropertyChangeListener</code> -
- * associating a name with the listener. This can be used to filter the
- * changes that one is interested in.
- *
- * @author Eric Blake (ebb9@email.byu.edu)
- * @since 1.4
- * @status udpated to 1.4
- */
-public class PropertyChangeListenerProxy extends EventListenerProxy
- implements PropertyChangeListener
-{
- /**
- * The name of the property to listen for. Package visible for use by
- * PropertyChangeSupport.
- */
- final String propertyName;
-
- /**
- * Create a new proxy which filters property change events and only passes
- * changes to the named property on to the delegate. A null propertyName
- * or listener does not fail now, but may cause a NullPointerException down
- * the road.
- *
- * @param propertyName the property's name to filter on
- * @param listener the delegate listener
- */
- public PropertyChangeListenerProxy(String propertyName,
- PropertyChangeListener listener)
- {
- super(listener);
- this.propertyName = propertyName;
- }
-
- /**
- * Forwards the event on to the delegate if the property name matches.
- *
- * @param event the event to pass on, if it meets the filter
- * @throws NullPointerException if the delegate this was created with is null
- */
- public void propertyChange(PropertyChangeEvent event)
- {
- // Note: Sun does not filter, under the assumption that since
- // PropertyChangeSupport unwraps proxys, this method should never be
- // called by normal use of listeners.
- String name = event == null ? null : event.getPropertyName();
- if (name == null ? propertyName == null : name.equals(propertyName))
- ((PropertyChangeListener) getListener()).propertyChange(event);
- }
-
- /**
- * Gets the name of the property this proxy is filtering on.
- *
- * @return the property name
- */
- public String getPropertyName()
- {
- return propertyName;
- }
-} // class PropertyChangeListenerProxy