// 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.transform;

 import org.apache.tapestry5.MarkupWriter;

 import org.apache.tapestry5.model.MutableComponentModel;

 import org.apache.tapestry5.runtime.RenderCommand;

 import org.apache.tapestry5.runtime.RenderQueue;

 import org.apache.tapestry5.services.ClassTransformation;

 import org.apache.tapestry5.services.ComponentClassTransformWorker;

 import org.apache.tapestry5.services.TransformMethodSignature;

 import java.lang.reflect.Modifier;

 /**

  * Ensures that all components implement {@link RenderCommand} by delegating to {@link

  * org.apache.tapestry5.internal.InternalComponentResources#queueRender(org.apache.tapestry5.runtime.RenderQueue)}.

  */

 public class RenderCommandWorker implements ComponentClassTransformWorker

 {

     private final TransformMethodSignature RENDER_SIGNATURE =

             new TransformMethodSignature(Modifier.PUBLIC, "void", "render", new String[] {

                     MarkupWriter.class.getName(), RenderQueue.class.getName() }, null);

     public void transform(ClassTransformation transformation, MutableComponentModel model)

     {

         // Subclasses don't need to bother, they'll inherit from super-classes.

         if (model.getParentModel() != null) return;

         transformation.addImplementedInterface(RenderCommand.class);

         String body = String.format("%s.queueRender($2);", transformation.getResourcesFieldName());

         transformation.addMethod(RENDER_SIGNATURE, body);

     }

 }