    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
    015    package org.apache.tapestry5.internal.services;
    016
    017    import org.apache.tapestry5.ComponentResources;
    018    import org.apache.tapestry5.internal.structure.Page;
    019    import org.apache.tapestry5.runtime.Component;
    020    import org.apache.tapestry5.runtime.RenderCommand;
    021    import org.apache.tapestry5.services.Ajax;
    022    import org.apache.tapestry5.services.ComponentEventResultProcessor;
    023
    024    import 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")
    031    public 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    }