// Copyright 2007, 2008 The Apache Software Foundation

 //

 // Licensed under the Apache License, Version 2.0 (the "License");

 // you may not use this file except in compliance with the License.

 // You may obtain a copy of the License at

 //

 //     http://www.apache.org/licenses/LICENSE-2.0

 //

 // Unless required by applicable law or agreed to in writing, software

 // distributed under the License is distributed on an "AS IS" BASIS,

 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

 // See the License for the specific language governing permissions and

 // limitations under the License.

 package org.apache.tapestry5.internal.services;

 import org.apache.tapestry5.ComponentResources;

 import org.apache.tapestry5.internal.structure.Page;

 import org.apache.tapestry5.runtime.Component;

 import org.apache.tapestry5.runtime.RenderCommand;

 import org.apache.tapestry5.services.Ajax;

 import org.apache.tapestry5.services.ComponentEventResultProcessor;

 import java.io.IOException;

 /**

  * Performs a partial page render based on a root component.

  */

 public class AjaxComponentInstanceEventResultProcessor implements ComponentEventResultProcessor<Component>

 {

     private final RequestPageCache cache;

     private final ComponentEventResultProcessor masterProcessor;

     public AjaxComponentInstanceEventResultProcessor(RequestPageCache cache,

                                                      @Ajax ComponentEventResultProcessor masterProcessor)

     {

         this.cache = cache;

         this.masterProcessor = masterProcessor;

     }

     public void processResultValue(Component value) throws IOException

     {

         ComponentResources resources = value.getComponentResources();

         boolean isPage = value == resources.getPage();

         String pageName = resources.getPageName();

         if (isPage)

         {

             // This will ultimately send a JSON response to redirect to the page

             masterProcessor.processResultValue(pageName);

             return;

         }

         // Otherwise, a component within a page.

         Page page = cache.get(pageName);

         String nestedId = resources.getNestedId();

         RenderCommand command = page.getComponentElementByNestedId(nestedId);

         masterProcessor.processResultValue(command);

     }

 }