001 package org.apache.turbine.services.jsp.util; 002 003 004 /* 005 * Licensed to the Apache Software Foundation (ASF) under one 006 * or more contributor license agreements. See the NOTICE file 007 * distributed with this work for additional information 008 * regarding copyright ownership. The ASF licenses this file 009 * to you under the Apache License, Version 2.0 (the 010 * "License"); you may not use this file except in compliance 011 * with the License. You may obtain a copy of the License at 012 * 013 * http://www.apache.org/licenses/LICENSE-2.0 014 * 015 * Unless required by applicable law or agreed to in writing, 016 * software distributed under the License is distributed on an 017 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 018 * KIND, either express or implied. See the License for the 019 * specific language governing permissions and limitations 020 * under the License. 021 */ 022 023 024 import org.apache.commons.logging.Log; 025 import org.apache.commons.logging.LogFactory; 026 import org.apache.turbine.modules.Screen; 027 import org.apache.turbine.modules.ScreenLoader; 028 import org.apache.turbine.services.assemblerbroker.TurbineAssemblerBroker; 029 import org.apache.turbine.services.template.TurbineTemplate; 030 import org.apache.turbine.util.RunData; 031 032 /** 033 * Returns output of a Screen module. An instance of this is placed in the 034 * request by the JspLayout. This allows template authors to 035 * place the screen template within the layout.<br> 036 * Here's how it's used in a JSP template:<br> 037 * <code> 038 * <%useBean id="screen_placeholder" class="JspScreenPlaceholder" scope="request"/%> 039 * ... 040 * <%= screen_placeholder %> 041 *</code> 042 * 043 * @author <a href="john.mcnally@clearink.com">John D. McNally</a> 044 * @author <a href="mailto:hps@intermeta.de">Henning P. Schmiedehausen</a> 045 * @version $Id: JspScreenPlaceholder.java 757213 2009-03-22 16:43:31Z tv $ 046 */ 047 public class JspScreenPlaceholder 048 { 049 /** Logging */ 050 private static Log log = LogFactory.getLog(JspNavigation.class); 051 052 /* The RunData object */ 053 private RunData data; 054 055 private ScreenLoader screenLoader; 056 057 /** 058 * Constructor 059 * 060 * @param data A Rundata Object 061 */ 062 public JspScreenPlaceholder(RunData data) 063 { 064 this.data = data; 065 this.screenLoader = (ScreenLoader)TurbineAssemblerBroker.getLoader(Screen.NAME); 066 } 067 068 /** 069 * builds the output of the navigation template 070 */ 071 public void exec() 072 { 073 String template = null; 074 String module = null; 075 try 076 { 077 template = data.getTemplateInfo().getScreenTemplate(); 078 module = TurbineTemplate.getScreenName(template); 079 screenLoader.exec(data, module); 080 } 081 catch (Exception e) 082 { 083 String message = "Error processing navigation template:" + 084 template + " using module: " + module; 085 log.error(message, e); 086 try 087 { 088 data.getResponse().getWriter().print("Error processing navigation template: " 089 + template + " using module: " + module); 090 } 091 catch (java.io.IOException ioe) 092 { 093 // ignore 094 } 095 } 096 } 097 }