103 lines
3.7 KiB
Java
103 lines
3.7 KiB
Java
/* VetoableChangeListenerProxy.java -- adds a name to a vetoable listener
|
|
Copyright (C) 2002 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., 59 Temple Place, Suite 330, Boston, MA
|
|
02111-1307 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>VetoableChangeListener</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 VetoableChangeListenerProxy extends EventListenerProxy
|
|
implements VetoableChangeListener
|
|
{
|
|
/**
|
|
* The name of the property to listen for. Package visible for use by
|
|
* VetoableChangeSupport.
|
|
*/
|
|
final String propertyName;
|
|
|
|
/**
|
|
* Create a new proxy which filters property change events and only passes
|
|
* changes to the named property on to the delegate.
|
|
*
|
|
* @param propertyName the property's name to filter on
|
|
* @param listener the delegate listener
|
|
*/
|
|
public VetoableChangeListenerProxy(String propertyName,
|
|
VetoableChangeListener 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
|
|
* @throws PropertyVetoException if the change is vetoed by the listener
|
|
*/
|
|
public void vetoableChange(PropertyChangeEvent event)
|
|
throws PropertyVetoException
|
|
{
|
|
// Note: Sun does not filter, under the assumption that since
|
|
// VetoableChangeSupport 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))
|
|
((VetoableChangeListener) getListener()).vetoableChange(event);
|
|
}
|
|
|
|
/**
|
|
* Gets the name of the property this proxy is filtering on.
|
|
*
|
|
* @return the property name
|
|
*/
|
|
public String getPropertyName()
|
|
{
|
|
return propertyName;
|
|
}
|
|
} // class VetoableChangeListenerProxy
|