001package org.apache.turbine.services.jsp.util; 002 003 004import org.apache.logging.log4j.LogManager; 005 006/* 007 * Licensed to the Apache Software Foundation (ASF) under one 008 * or more contributor license agreements. See the NOTICE file 009 * distributed with this work for additional information 010 * regarding copyright ownership. The ASF licenses this file 011 * to you under the Apache License, Version 2.0 (the 012 * "License"); you may not use this file except in compliance 013 * with the License. You may obtain a copy of the License at 014 * 015 * http://www.apache.org/licenses/LICENSE-2.0 016 * 017 * Unless required by applicable law or agreed to in writing, 018 * software distributed under the License is distributed on an 019 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 020 * KIND, either express or implied. See the License for the 021 * specific language governing permissions and limitations 022 * under the License. 023 */ 024 025 026import org.apache.logging.log4j.Logger; 027import org.apache.turbine.modules.Screen; 028import org.apache.turbine.modules.ScreenLoader; 029import org.apache.turbine.services.TurbineServices; 030import org.apache.turbine.services.assemblerbroker.AssemblerBrokerService; 031import org.apache.turbine.services.template.TemplateService; 032import org.apache.turbine.util.RunData; 033 034/** 035 * Returns output of a Screen module. An instance of this is placed in the 036 * request by the JspLayout. This allows template authors to 037 * place the screen template within the layout.<br> 038 * Here's how it's used in a JSP template:<br> 039 * <code> 040 * <%useBean id="screen_placeholder" class="JspScreenPlaceholder" scope="request" %> 041 * ... 042 * <%= screen_placeholder %> 043 * </code> 044 * 045 * @author <a href="john.mcnally@clearink.com">John D. McNally</a> 046 * @author <a href="mailto:hps@intermeta.de">Henning P. Schmiedehausen</a> 047 * @version $Id$ 048 */ 049public class JspScreenPlaceholder 050{ 051 /** Logging */ 052 private static Logger log = LogManager.getLogger(JspNavigation.class); 053 054 /* The RunData object */ 055 private final RunData data; 056 057 private final ScreenLoader screenLoader; 058 059 /** 060 * Constructor 061 * 062 * @param data A Rundata Object 063 */ 064 public JspScreenPlaceholder(RunData data) 065 { 066 this.data = data; 067 AssemblerBrokerService abs = (AssemblerBrokerService)TurbineServices.getInstance() 068 .getService(AssemblerBrokerService.SERVICE_NAME); 069 this.screenLoader = (ScreenLoader)abs.getLoader(Screen.class); 070 } 071 072 /** 073 * builds the output of the navigation template 074 */ 075 public void exec() 076 { 077 String template = null; 078 String module = null; 079 try 080 { 081 template = data.getTemplateInfo().getScreenTemplate(); 082 TemplateService templateService = (TemplateService)TurbineServices.getInstance().getService(TemplateService.SERVICE_NAME); 083 module = templateService.getScreenName(template); 084 screenLoader.exec(data, module); 085 } 086 catch (Exception e) 087 { 088 String message = "Error processing screen template:" + 089 template + " using module: " + module; 090 log.error(message, e); 091 try 092 { 093 data.getResponse().getWriter().print(message); 094 } 095 catch (java.io.IOException ioe) 096 { 097 // ignore 098 } 099 } 100 } 101}