1 package org.apache.turbine.services.jsp.util;
2
3 /* ====================================================================
4 * The Apache Software License, Version 1.1
5 *
6 * Copyright (c) 2001 The Apache Software Foundation. All rights
7 * reserved.
8 *
9 * Redistribution and use in source and binary forms, with or without
10 * modification, are permitted provided that the following conditions
11 * are met:
12 *
13 * 1. Redistributions of source code must retain the above copyright
14 * notice, this list of conditions and the following disclaimer.
15 *
16 * 2. Redistributions in binary form must reproduce the above copyright
17 * notice, this list of conditions and the following disclaimer in
18 * the documentation and/or other materials provided with the
19 * distribution.
20 *
21 * 3. The end-user documentation included with the redistribution,
22 * if any, must include the following acknowledgment:
23 * "This product includes software developed by the
24 * Apache Software Foundation (http://www.apache.org/)."
25 * Alternately, this acknowledgment may appear in the software itself,
26 * if and wherever such third-party acknowledgments normally appear.
27 *
28 * 4. The names "Apache" and "Apache Software Foundation" and
29 * "Apache Turbine" must not be used to endorse or promote products
30 * derived from this software without prior written permission. For
31 * written permission, please contact apache@apache.org.
32 *
33 * 5. Products derived from this software may not be called "Apache",
34 * "Apache Turbine", nor may "Apache" appear in their name, without
35 * prior written permission of the Apache Software Foundation.
36 *
37 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
38 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
39 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
40 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
41 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
42 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
43 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
44 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
45 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
46 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
47 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
48 * SUCH DAMAGE.
49 * ====================================================================
50 *
51 * This software consists of voluntary contributions made by many
52 * individuals on behalf of the Apache Software Foundation. For more
53 * information on the Apache Software Foundation, please see
54 * <http://www.apache.org/>.
55 */
56
57 import org.apache.turbine.modules.ScreenLoader;
58 import org.apache.turbine.services.TurbineServices;
59 import org.apache.turbine.services.template.TemplateService;
60 import org.apache.turbine.util.Log;
61 import org.apache.turbine.util.RunData;
62
63 /***
64 * Returns output of a Navigation module. An instance of this is placed in the
65 * request by the JspLayout. This allows template authors to
66 * place the screen template within the layout.<br>
67 * Here's how it's used in a JSP template:<br>
68 * <code>
69 * <%useBean id="screen_placeholder" class="JspScreenPlaceholder" scope="request"/%>
70 * ...
71 * <%= screen_placeholder %>
72 *</code>
73 *
74 * @author <a href="john.mcnally@clearink.com">John D. McNally</a>
75 */
76 public class JspScreenPlaceholder
77 {
78 /* The RunData object */
79 private RunData data;
80
81 /***
82 * Constructor
83 *
84 * @param RunData
85 */
86 public JspScreenPlaceholder(RunData data)
87 {
88 this.data = data;
89 }
90
91 /***
92 * builds the output of the navigation template
93 * @param String the name of the navigation template
94 * @return String
95 */
96 public void exec()
97 {
98 String template = null;
99 String module = null;
100 try
101 {
102 template = data.getTemplateInfo().getScreenTemplate();
103 module = ((TemplateService)TurbineServices.getInstance().getService(
104 TemplateService.SERVICE_NAME)).getScreenName(template);
105 ScreenLoader.getInstance().exec(data, module);
106 }
107 catch (Exception e)
108 {
109 String message = "Error processing navigation template:" +
110 template + " using module: " + module;
111 Log.error(message, e);
112 try
113 {
114 data.getOut().print("Error processing navigation template: "
115 + template + " using module: " + module);
116 }
117 catch(java.io.IOException ioe) {}
118 }
119 }
120 }
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