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/*
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* Angkor Web Framework
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*
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* Distributable under LGPL license.
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* See terms of license at gnu.org.
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*/
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package com.tirsen.angkor.event;
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import com.tirsen.angkor.Debug;
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import com.tirsen.angkor.Multicaster;
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import com.tirsen.angkor.RenderContext;
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import org.apache.log4j.Category;
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import java.io.Serializable;
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/**
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* Utility class for sending change events.
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*
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* <!-- $Id: ChangeSourceHelper.java,v 1.3 2002/10/09 21:37:37 tirsen Exp $ -->
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*
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* @author $Author: tirsen $
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* @version $Revision: 1.3 $
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*/
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public class ChangeSourceHelper implements ChangeSource, Serializable
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{
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private static final Category logger = Category.getInstance(Debug.LOGGER_NAME);
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private Object source;
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private ChangeListener listeners;
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public ChangeSourceHelper(Object source)
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{
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this.source = source;
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}
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public void addChangeListener(ChangeListener listener)
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{
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if (listeners == null) listeners = (ChangeListener) Multicaster.create(ChangeListener.class, true);
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Multicaster.add(listeners, listener);
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}
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public void removeChangeListener(ChangeListener listener)
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{
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listeners = (ChangeListener) Multicaster.remove(listeners, listener);
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}
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public void signalChangeEvent(RenderContext context)
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{
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if (!Multicaster.isEmpty(listeners))
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{
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ChangeEvent evt = new ChangeEvent(source);
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context.getEventQueue().postEvent(ChangeListener.class, listeners, evt, "stateChanged");
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}
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}
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public void signalChangeEvent()
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{
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if (!Multicaster.isEmpty(listeners))
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{
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ChangeEvent evt = new ChangeEvent(source);
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RenderContext.getRenderContext().getEventQueue().postEvent(ChangeListener.class, listeners, evt, "stateChanged");
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}
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}
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}
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