    001// Copyright 2007, 2008, 2010 The Apache Software Foundation
    002//
    003// Licensed under the Apache License, Version 2.0 (the "License");
    004// you may not use this file except in compliance with the License.
    005// You may obtain a copy of the License at
    006//
    007// http://www.apache.org/licenses/LICENSE-2.0
    008//
    009// Unless required by applicable law or agreed to in writing, software
    010// distributed under the License is distributed on an "AS IS" BASIS,
    011// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    012// See the License for the specific language governing permissions and
    013// limitations under the License.
    014
    015package org.apache.tapestry5.internal.services;
    016
    017import org.apache.tapestry5.ComponentResources;
    018import org.apache.tapestry5.internal.structure.Page;
    019import org.apache.tapestry5.runtime.Component;
    020import org.apache.tapestry5.runtime.RenderCommand;
    021import org.apache.tapestry5.services.Ajax;
    022import org.apache.tapestry5.services.ComponentEventResultProcessor;
    023
    024import java.io.IOException;
    025
    026/**
    027 * Performs a partial page render based on a root component. If the component is actually a page,
    028 * it will send an JSON reponse to rediret to the page.
    029 */
    030@SuppressWarnings("all")
    031public class AjaxComponentInstanceEventResultProcessor implements ComponentEventResultProcessor<Component>
    032{
    033    private final RequestPageCache cache;
    034
    035    private final ComponentEventResultProcessor masterProcessor;
    036
    037    public AjaxComponentInstanceEventResultProcessor(RequestPageCache cache, @Ajax
    038    ComponentEventResultProcessor masterProcessor)
    039    {
    040        this.cache = cache;
    041        this.masterProcessor = masterProcessor;
    042    }
    043
    044    public void processResultValue(Component value) throws IOException
    045    {
    046        ComponentResources resources = value.getComponentResources();
    047
    048        boolean isPage = value == resources.getPage();
    049
    050        String pageName = resources.getPageName();
    051
    052        if (isPage)
    053        {
    054            // This will ultimately send a JSON response to redirect to the page
    055
    056            masterProcessor.processResultValue(pageName);
    057            return;
    058        }
    059
    060        // Otherwise, a component within a page. Components are transformed to implement RenderCommand, but if we just
    061        // pass the component itself to the master processor, we'll get in a loop, so we instead
    062        // pass the ComponentPageElement (which implements RenderCommand as well).
    063
    064        Page page = cache.get(pageName);
    065
    066        String nestedId = resources.getNestedId();
    067
    068        RenderCommand command = page.getComponentElementByNestedId(nestedId);
    069
    070        masterProcessor.processResultValue(command);
    071    }
    072}