| /* |
| * $Id$ |
| * |
| * Licensed to the Apache Software Foundation (ASF) under one |
| * or more contributor license agreements. See the NOTICE file |
| * distributed with this work for additional information |
| * regarding copyright ownership. The ASF licenses this file |
| * to you 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.tiles.request.render; |
| |
| import java.io.IOException; |
| |
| import org.apache.tiles.request.Request; |
| import org.apache.tiles.request.DispatchRequest; |
| import org.apache.tiles.request.RequestWrapper; |
| |
| /** |
| * Renders an attribute that contains a reference to a template. |
| * |
| * @version $Rev$ $Date$ |
| */ |
| public class DispatchRenderer implements Renderer { |
| |
| /** {@inheritDoc} */ |
| @Override |
| public void render(String path, Request request) throws IOException { |
| if (path == null) { |
| throw new CannotRenderException("Cannot dispatch a null path"); |
| } |
| DispatchRequest dispatchRequest = getDispatchRequest(request); |
| if (dispatchRequest == null) { |
| throw new CannotRenderException("Cannot dispatch outside of a web environment"); |
| } |
| |
| dispatchRequest.dispatch(path); |
| } |
| |
| /** {@inheritDoc} */ |
| public boolean isRenderable(String path, Request request) { |
| return path != null && getDispatchRequest(request) != null && path.startsWith("/"); |
| } |
| |
| private DispatchRequest getDispatchRequest(Request request) { |
| Request result = request; |
| while (!(result instanceof DispatchRequest) && result instanceof RequestWrapper) { |
| result = ((RequestWrapper) result).getWrappedRequest(); |
| } |
| if (!(result instanceof DispatchRequest)) { |
| result = null; |
| } |
| return (DispatchRequest) result; |
| } |
| } |