1 package org.apache.turbine.services.jsp.util;
2
3
4 /*
5 * Licensed to the Apache Software Foundation (ASF) under one
6 * or more contributor license agreements. See the NOTICE file
7 * distributed with this work for additional information
8 * regarding copyright ownership. The ASF licenses this file
9 * to you under the Apache License, Version 2.0 (the
10 * "License"); you may not use this file except in compliance
11 * with the License. You may obtain a copy of the License at
12 *
13 * http://www.apache.org/licenses/LICENSE-2.0
14 *
15 * Unless required by applicable law or agreed to in writing,
16 * software distributed under the License is distributed on an
17 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
18 * KIND, either express or implied. See the License for the
19 * specific language governing permissions and limitations
20 * under the License.
21 */
22
23
24 import org.apache.commons.logging.Log;
25 import org.apache.commons.logging.LogFactory;
26 import org.apache.turbine.modules.Screen;
27 import org.apache.turbine.modules.ScreenLoader;
28 import org.apache.turbine.services.TurbineServices;
29 import org.apache.turbine.services.assemblerbroker.AssemblerBrokerService;
30 import org.apache.turbine.services.template.TemplateService;
31 import org.apache.turbine.util.RunData;
32
33 /**
34 * Returns output of a Screen module. An instance of this is placed in the
35 * request by the JspLayout. This allows template authors to
36 * place the screen template within the layout.<br>
37 * Here's how it's used in a JSP template:<br>
38 * <code>
39 * <%useBean id="screen_placeholder" class="JspScreenPlaceholder" scope="request" %>
40 * ...
41 * <%= screen_placeholder %>
42 * </code>
43 *
44 * @author <a href="john.mcnally@clearink.com">John D. McNally</a>
45 * @author <a href="mailto:hps@intermeta.de">Henning P. Schmiedehausen</a>
46 * @version $Id: JspScreenPlaceholder.java 1773378 2016-12-09 13:19:59Z tv $
47 */
48 public class JspScreenPlaceholder
49 {
50 /** Logging */
51 private static Log log = LogFactory.getLog(JspNavigation.class);
52
53 /* The RunData object */
54 private final RunData data;
55
56 private final ScreenLoader screenLoader;
57
58 /**
59 * Constructor
60 *
61 * @param data A Rundata Object
62 */
63 public JspScreenPlaceholder(RunData data)
64 {
65 this.data = data;
66 AssemblerBrokerService abs = (AssemblerBrokerService)TurbineServices.getInstance()
67 .getService(AssemblerBrokerService.SERVICE_NAME);
68 this.screenLoader = (ScreenLoader)abs.getLoader(Screen.class);
69 }
70
71 /**
72 * builds the output of the navigation template
73 */
74 public void exec()
75 {
76 String template = null;
77 String module = null;
78 try
79 {
80 template = data.getTemplateInfo().getScreenTemplate();
81 TemplateService templateService = (TemplateService)TurbineServices.getInstance().getService(TemplateService.SERVICE_NAME);
82 module = templateService.getScreenName(template);
83 screenLoader.exec(data, module);
84 }
85 catch (Exception e)
86 {
87 String message = "Error processing navigation template:" +
88 template + " using module: " + module;
89 log.error(message, e);
90 try
91 {
92 data.getResponse().getWriter().print("Error processing navigation template: "
93 + template + " using module: " + module);
94 }
95 catch (java.io.IOException ioe)
96 {
97 // ignore
98 }
99 }
100 }
101 }