| /* |
| * 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.cocoon.reading; |
| |
| import java.io.ByteArrayInputStream; |
| import java.io.IOException; |
| import java.io.InputStreamReader; |
| import java.io.OutputStreamWriter; |
| import java.io.Reader; |
| import java.io.Writer; |
| |
| import javax.servlet.ServletContext; |
| import javax.servlet.ServletException; |
| import javax.servlet.http.HttpServletRequest; |
| import javax.servlet.http.HttpServletResponse; |
| |
| import org.apache.avalon.framework.configuration.Configurable; |
| import org.apache.avalon.framework.configuration.Configuration; |
| import org.apache.avalon.framework.configuration.ConfigurationException; |
| import org.apache.cocoon.ProcessingException; |
| import org.apache.cocoon.components.jsp.JSPEngine; |
| import org.apache.cocoon.environment.http.HttpEnvironment; |
| import org.apache.excalibur.source.Source; |
| |
| /** |
| * The <code>JSPReader</code> component is used to serve Servlet and JSP page |
| * output data in a sitemap pipeline. |
| * |
| * @author <a href="mailto:kpiroumian@flagship.ru">Konstantin Piroumian</a> |
| * @version CVS $Id$ |
| */ |
| public class JSPReader extends ServiceableReader implements Configurable { |
| |
| private static final int DEFAULT_BUFFER_SIZE = 8192; |
| |
| // buffer size for IO |
| private int bufferSize; |
| |
| // output encoding |
| private String outputEncoding; |
| |
| public void configure(Configuration conf) throws ConfigurationException { |
| bufferSize = conf.getChild("buffer-size").getValueAsInteger(DEFAULT_BUFFER_SIZE); |
| outputEncoding = conf.getChild("output-encoding").getValue(null); |
| } |
| |
| /** |
| * Generates the output from JSPEngine. |
| */ |
| public void generate() throws IOException, ProcessingException { |
| if (this.source == null) { |
| throw new ProcessingException("JSPReader: source JSP is not specified"); |
| } |
| |
| HttpServletResponse servletResponse = |
| (HttpServletResponse) super.objectModel.get(HttpEnvironment.HTTP_RESPONSE_OBJECT); |
| HttpServletRequest servletRequest = |
| (HttpServletRequest) super.objectModel.get(HttpEnvironment.HTTP_REQUEST_OBJECT); |
| ServletContext servletContext = |
| (ServletContext) super.objectModel.get(HttpEnvironment.HTTP_SERVLET_CONTEXT); |
| |
| // ensure that we are running in a servlet environment |
| if (servletResponse == null || servletRequest == null || servletContext == null) { |
| throw new ProcessingException("JSPReader can only be used from within a Servlet environment."); |
| } |
| |
| JSPEngine engine = null; |
| Source inputSource = null; |
| Source contextSource = null; |
| try { |
| inputSource = this.resolver.resolveURI(this.source); |
| contextSource = this.resolver.resolveURI("context:/"); |
| |
| String inputSourceURI = inputSource.getURI(); |
| String contextSourceURI = contextSource.getURI(); |
| |
| if (!inputSourceURI.startsWith(contextSourceURI)) { |
| throw new ProcessingException("You must not reference a file " |
| + "outside of the servlet context at " + contextSourceURI + "."); |
| } |
| |
| String url = inputSourceURI.substring(contextSourceURI.length()); |
| if (url.charAt(0) != '/') { |
| url = "/" + url; |
| } |
| |
| if (getLogger().isDebugEnabled()) { |
| getLogger().debug("JSPReader executing:" + url); |
| } |
| |
| engine = (JSPEngine) super.manager.lookup(JSPEngine.ROLE); |
| byte[] bytes = engine.executeJSP(url, servletRequest, servletResponse, servletContext); |
| |
| if (this.outputEncoding != null) { |
| recodeResult (bytes, this.outputEncoding); |
| } else { |
| out.write(bytes); |
| out.flush(); |
| } |
| |
| bytes = null; |
| } catch (ServletException e) { |
| throw new ProcessingException("ServletException while executing JSPEngine", e); |
| } catch (IOException e) { |
| throw new ProcessingException("IOException JSPReader.generate()", e); |
| } catch (ProcessingException e) { |
| throw e; |
| } catch (Exception e) { |
| throw new ProcessingException("Exception JSPReader.generate()", e); |
| } finally { |
| super.manager.release(engine); |
| this.resolver.release(inputSource); |
| this.resolver.release(contextSource); |
| } |
| } |
| |
| private void recodeResult(byte[] bytes, String encoding) throws IOException { |
| char[] buffer = new char[this.bufferSize]; |
| |
| ByteArrayInputStream bais = new ByteArrayInputStream(bytes); |
| // UTF-8 is the default encoding/contract of the JSPEngine |
| Reader reader = new InputStreamReader(bais, "UTF-8"); |
| Writer writer = new OutputStreamWriter(out, encoding); |
| |
| int length = -1; |
| while ((length = reader.read(buffer)) > -1) { |
| writer.write(buffer, 0, length); |
| } |
| writer.flush(); |
| } |
| } |