| /* |
| * $Id$ |
| * |
| * 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.freemarker.render; |
| |
| import java.io.IOException; |
| |
| import javax.servlet.ServletException; |
| import javax.servlet.http.HttpServletRequest; |
| import javax.servlet.http.HttpServletResponse; |
| |
| import org.apache.tiles.request.Request; |
| import org.apache.tiles.request.freemarker.FreemarkerRequestException; |
| import org.apache.tiles.request.render.CannotRenderException; |
| import org.apache.tiles.request.render.Renderer; |
| import org.apache.tiles.request.servlet.ExternalWriterHttpServletResponse; |
| import org.apache.tiles.request.servlet.ServletRequest; |
| |
| /** |
| * FreeMarker renderer for rendering FreeMarker templates as Tiles attributes. |
| * It is only usable under a Servlet environment, because it uses |
| * {@link AttributeValueFreemarkerServlet} internally to forward the request.<br/> |
| * To initialize it correctly, call {@link #setParameter(String, String)} for all the |
| * parameters that you want to set, and then call {@link #commit()}. |
| * |
| * @version $Rev$ $Date$ |
| */ |
| public class FreemarkerRenderer implements Renderer { |
| |
| /** |
| * The servlet that is used to forward the request to. |
| */ |
| private AttributeValueFreemarkerServlet servlet; |
| |
| /** |
| * Constructor. |
| * |
| * @param servlet The servlet to use. |
| */ |
| public FreemarkerRenderer(AttributeValueFreemarkerServlet servlet) { |
| this.servlet = servlet; |
| } |
| |
| /** {@inheritDoc} */ |
| @Override |
| public void render(String path, Request request) throws IOException { |
| if (path == null) { |
| throw new CannotRenderException("Cannot dispatch a null path"); |
| } |
| ServletRequest servletRequest = org.apache.tiles.request.servlet.ServletUtil.getServletRequest(request); |
| HttpServletRequest httpRequest = servletRequest.getRequest(); |
| HttpServletResponse httpResponse = servletRequest.getResponse(); |
| servlet.setValue(path); |
| try { |
| servlet.doGet(httpRequest, |
| new ExternalWriterHttpServletResponse(httpResponse, |
| request.getPrintWriter())); |
| } catch (ServletException e) { |
| throw new FreemarkerRequestException("Exception when rendering a FreeMarker attribute", e); |
| } |
| } |
| |
| /** {@inheritDoc} */ |
| public boolean isRenderable(String path, Request request) { |
| return path != null && path.startsWith("/") && path.endsWith(".ftl"); |
| } |
| } |