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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 action events.
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*
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* <!-- $Id: ActionSourceHelper.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 ActionSourceHelper implements ActionSource, Serializable
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{
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private static final Category logger = Category.getInstance(Debug.LOGGER_NAME);
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private Action action;
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private Object source;
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private ActionListener listeners;
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public ActionSourceHelper(Object source)
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{
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this.source = source;
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}
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public Action getAction()
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{
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return action;
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}
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public void setAction(Action action)
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{
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this.action = action;
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}
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public void addActionListener(ActionListener listener)
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{
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if (listeners == null) listeners = (ActionListener) Multicaster.create(ActionListener.class, true);
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Multicaster.add(listeners, listener);
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}
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public void removeActionListener(ActionListener listener)
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{
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Multicaster.remove(listeners, listener);
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if (Multicaster.isEmpty(listeners)) listeners = null;
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}
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public void signalActionEvent(RenderContext context)
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{
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if (hasListeners())
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{
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ActionEvent evt = new ActionEvent(source);
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if (action != null)
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{
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logger.info("invoking action " + action);
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context.getEventQueue().postEvent(ActionListener.class, action, evt, "actionPerformed");
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}
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if (!Multicaster.isEmpty(listeners)) context.getEventQueue().postEvent(ActionListener.class, listeners, evt, "actionPerformed");
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}
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}
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public void signalActionEvent()
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{
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if (hasListeners())
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{
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signalActionEvent(RenderContext.getRenderContext());
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}
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}
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public boolean hasListeners()
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{
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return !Multicaster.isEmpty(listeners) || action != null;
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}
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}
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