001package 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 024import org.apache.commons.logging.Log; 025import org.apache.commons.logging.LogFactory; 026import org.apache.turbine.modules.Screen; 027import org.apache.turbine.modules.ScreenLoader; 028import org.apache.turbine.services.TurbineServices; 029import org.apache.turbine.services.assemblerbroker.AssemblerBrokerService; 030import org.apache.turbine.services.template.TemplateService; 031import org.apache.turbine.util.RunData; 032 033/** 034 * Returns output of a Screen module. An instance of this is placed in the 035 * request by the JspLayout. This allows template authors to 036 * place the screen template within the layout.<br> 037 * Here's how it's used in a JSP template:<br> 038 * <code> 039 * <%useBean id="screen_placeholder" class="JspScreenPlaceholder" scope="request" %> 040 * ... 041 * <%= screen_placeholder %> 042 * </code> 043 * 044 * @author <a href="john.mcnally@clearink.com">John D. McNally</a> 045 * @author <a href="mailto:hps@intermeta.de">Henning P. Schmiedehausen</a> 046 * @version $Id: JspScreenPlaceholder.java 1773378 2016-12-09 13:19:59Z tv $ 047 */ 048public class JspScreenPlaceholder 049{ 050 /** Logging */ 051 private static Log log = LogFactory.getLog(JspNavigation.class); 052 053 /* The RunData object */ 054 private final RunData data; 055 056 private final ScreenLoader screenLoader; 057 058 /** 059 * Constructor 060 * 061 * @param data A Rundata Object 062 */ 063 public JspScreenPlaceholder(RunData data) 064 { 065 this.data = data; 066 AssemblerBrokerService abs = (AssemblerBrokerService)TurbineServices.getInstance() 067 .getService(AssemblerBrokerService.SERVICE_NAME); 068 this.screenLoader = (ScreenLoader)abs.getLoader(Screen.class); 069 } 070 071 /** 072 * builds the output of the navigation template 073 */ 074 public void exec() 075 { 076 String template = null; 077 String module = null; 078 try 079 { 080 template = data.getTemplateInfo().getScreenTemplate(); 081 TemplateService templateService = (TemplateService)TurbineServices.getInstance().getService(TemplateService.SERVICE_NAME); 082 module = templateService.getScreenName(template); 083 screenLoader.exec(data, module); 084 } 085 catch (Exception e) 086 { 087 String message = "Error processing navigation template:" + 088 template + " using module: " + module; 089 log.error(message, e); 090 try 091 { 092 data.getResponse().getWriter().print("Error processing navigation template: " 093 + template + " using module: " + module); 094 } 095 catch (java.io.IOException ioe) 096 { 097 // ignore 098 } 099 } 100 } 101}