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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.process;
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import com.tirsen.angkor.Application;
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import com.tirsen.angkor.RenderContext;
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import com.tirsen.angkor.event.EventQueue;
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import java.util.Iterator;
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/**
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* <!-- $Id: EventValve.java,v 1.4 2002/10/13 13:37:26 tirsen Exp $ -->
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* <!-- $Author: tirsen $ -->
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*
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* @author Jon Tirs´n (tirsen@users.sourceforge.net)
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* @version $Revision: 1.4 $
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*/
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public class EventValve implements Valve
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{
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public static final ExecuteContext.Attribute CurrentEventAttribute = new ExecuteContext.Attribute("CurrentEvent");
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/**
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* Create a sub-pipeline which is executed for each event. This pipeline catches warnings (according to
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* {@link Application.isWarning(Throwable)} but not fatal errors. If a warnings occurs event processing continues.
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*/
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private Pipeline createEventPipeline()
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{
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Pipeline pipeline = new DefaultPipeline();
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pipeline.addValve(new ProcessEventValve());
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return pipeline;
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}
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public static class ProcessEventValve implements Valve
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{
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public void execute(ExecuteContext exec) throws Exception
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{
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EventQueue.QueuedEvent event = (EventQueue.QueuedEvent) exec.getAttribute(CurrentEventAttribute);
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Application application = (Application) exec.getAttribute(ExecuteContext.ApplicationAttribute);
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event.send(application);
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}
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}
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public void execute(ExecuteContext exec) throws Exception
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{
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Application application = (Application) exec.getAttribute(ExecuteContext.ApplicationAttribute);
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RenderContext renderContext = (RenderContext) exec.getAttribute(ExecuteContext.RenderContextAttribute);
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// events no longer need to be postponed until later, but can instead be processed immediately
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renderContext.getEventQueue().setPostponeEvents(false);
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Pipeline eventPipeline = createEventPipeline();
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Iterator it = renderContext.getEventQueue().iterateEvents();
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while (it.hasNext())
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{
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EventQueue.QueuedEvent event = (EventQueue.QueuedEvent) it.next();
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ExecuteContext subExec = eventPipeline.createExecuteContext(renderContext);
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subExec.setAttribute(CurrentEventAttribute, event);
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// bind current view to get warnings associated with the source of the event
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subExec.setAttribute(ExecuteContext.CurrentViewAttribute, event.getEvent().getSource());
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eventPipeline.execute(subExec);
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}
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exec.executeNext();
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// restore to the next time
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renderContext.getEventQueue().setPostponeEvents(true);
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}
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}
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