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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.jsp;
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import com.tirsen.angkor.Application;
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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 com.tirsen.angkor.process.ExecuteContext;
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import com.tirsen.angkor.process.Pipeline;
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import com.tirsen.angkor.process.RenderValve;
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import com.tirsen.angkor.process.Valve;
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import org.apache.log4j.Category;
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import java.util.Iterator;
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import java.util.Map;
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/**
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* <!-- $Id: PrerenderValve.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 class PrerenderValve extends RenderValve
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{
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private static final Category logger = Debug.getCategory();
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/**
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* The resulting {@link PrerenderedComponentsRegistry} resulting from this valve.
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*/
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public static final ExecuteContext.Attribute PrerenderedComponentsRegistryAttribute = new ExecuteContext.Attribute("PrerenderedComponentsRegistry");
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/**
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* Name of the component to be prerendered in the registry.
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*/
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private static final ExecuteContext.Attribute RegistryNameAttribute = new ExecuteContext.Attribute("RegistryName");
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public static class DoPrerenderValve 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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PrerenderedComponentsRegistry registry = (PrerenderedComponentsRegistry) exec.getAttribute(PrerenderedComponentsRegistryAttribute);
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String name = (String) exec.getAttribute(RegistryNameAttribute);
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View view = (View) exec.getAttribute(ExecuteContext.CurrentViewAttribute);
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logger.debug("prerendering view " + name + " = " + view);
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registry.prerender(name, view);
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exec.executeNext();
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}
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}
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protected Pipeline createRenderPipeline()
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{
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Pipeline pipeline = super.createRenderPipeline();
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pipeline.addValve(new DoPrerenderValve());
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return pipeline;
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}
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public void execute(ExecuteContext exec) throws Exception
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{
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RenderContext context = (RenderContext) exec.getAttribute(ExecuteContext.RenderContextAttribute);
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Application application = (Application) exec.getAttribute(ExecuteContext.ApplicationAttribute);
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PrerenderedComponentsRegistry registry = new PrerenderedComponentsRegistry(context);
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exec.setAttribute(PrerenderedComponentsRegistryAttribute, registry);
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Map components = application.getComponentsToPrerender();
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Pipeline subPipeline = createRenderPipeline();
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for (Iterator iterator = components.entrySet().iterator(); iterator.hasNext();)
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{
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Map.Entry entry = (Map.Entry) iterator.next();
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ExecuteContext subExec = subPipeline.createSubContext(exec);
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String name = (String) entry.getKey();
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subExec.setAttribute(RegistryNameAttribute, name);
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if (entry.getValue() instanceof View)
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{
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subExec.setAttribute(ExecuteContext.CurrentViewAttribute, entry.getValue());
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}
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else if (entry.getValue() instanceof ViewFactory)
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{
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subExec.setAttribute(ViewFactoryAttribute, entry.getValue());
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}
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subPipeline.execute(subExec);
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}
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exec.executeNext();
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}
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}
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