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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.Debug;
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import com.tirsen.angkor.RenderContext;
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import com.tirsen.angkor.View;
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import com.tirsen.angkor.ViewFactory;
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import org.apache.log4j.Category;
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/**
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* <!-- $Id: RenderValve.java,v 1.3 2002/10/09 21:37:37 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: 1.3 $
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*/
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public abstract class RenderValve implements Valve
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{
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public static final ExecuteContext.Attribute ViewFactoryAttribute = new ExecuteContext.Attribute("ViewFactory");
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/**
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* Create a sub-pipeline which is executed for each view factory to render.
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* In this abstract class no actual render valve is added but subclasses must add it's own variety to the end.
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*/
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protected Pipeline createRenderPipeline()
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{
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Pipeline pipeline = new DefaultPipeline();
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pipeline.addValve(new CreateViewValve());
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return pipeline;
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}
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public static class CreateViewValve implements Valve
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{
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private static final Category logger = Debug.getCategory();
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public void execute(ExecuteContext exec) throws Exception
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{
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ViewFactory factory = (ViewFactory) exec.getAttribute(ViewFactoryAttribute);
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if (factory != null)
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{
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//logger.debug("NOT preparing " + factory + " for render");
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//factory.prepare();
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logger.debug("creating view for " + factory);
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View view = factory.getView();
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exec.setAttribute(ExecuteContext.CurrentViewAttribute, view);
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}
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exec.executeNext();
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}
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}
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public static class DoRenderValve 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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View view = (View) exec.getAttribute(ExecuteContext.CurrentViewAttribute);
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RenderContext renderContext = (RenderContext) exec.getAttribute(ExecuteContext.RenderContextAttribute);
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view.render(renderContext);
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exec.executeNext();
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}
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}
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public abstract void execute(ExecuteContext exec) throws Exception;
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}
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