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Java > Open Source Codes > org > apache > jetspeed > services > jsp > tags > NavigationTag


1 package org.apache.jetspeed.services.jsp.tags;
2
3 /*
4  * Copyright 2000-2004 The Apache Software Foundation.
5  *
6  * Licensed under the Apache License, Version 2.0 (the "License");
7  * you may not use this file except in compliance with the License.
8  * You may obtain a copy of the License at
9  *
10  * http://www.apache.org/licenses/LICENSE-2.0
11  *
12  * Unless required by applicable law or agreed to in writing, software
13  * distributed under the License is distributed on an "AS IS" BASIS,
14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15  * See the License for the specific language governing permissions and
16  * limitations under the License.
17  */
18
19 import javax.servlet.jsp.JspException JavaDoc;
20 import javax.servlet.jsp.PageContext JavaDoc;
21 import javax.servlet.jsp.tagext.TagSupport JavaDoc;
22
23
24 // JetSpeed Classes
25 import org.apache.jetspeed.services.TemplateLocator;
26
27 // Turbine Classes
28 import org.apache.turbine.modules.NavigationLoader;
29 import org.apache.turbine.util.RunData;
30 import org.apache.turbine.services.template.TemplateService;
31 import org.apache.turbine.services.jsp.JspService;
32 import org.apache.turbine.services.TurbineServices;
33
34 // Jetspeed classes
35 import org.apache.jetspeed.services.logging.JetspeedLogFactoryService;
36 import org.apache.jetspeed.services.logging.JetspeedLogger;
37
38 /**
39  * Supporting class for the navigation tag.
40  * Includes a navigation JSP. If the respective tag parameter is set,
41  * different JSPs will be choosen, depending on whether the user has
42  * already logged in or not.
43  *
44  * @author <a HREF="mailto:ingo@raleigh.ibm.com">Ingo Schuster</a>
45  */
46 public class NavigationTag extends TagSupport JavaDoc
47 {
48     /**
49      * Static initialization of the logger for this class
50      */
51     private static final JetspeedLogger logger = JetspeedLogFactoryService.getLogger(NavigationTag.class.getName());
52     
53     /**
54      * defaultTemplate parameter defines the template whose contents will replace
55      * this tag in the layout if none of the special states are detected.
56      */
57     private String JavaDoc defaultTemplate;
58
59     /**
60      * The setter for DefaultTemplate parameter
61      */
62     public void setDefaultTemplate(String JavaDoc defaultTemplate)
63     {
64         this.defaultTemplate = defaultTemplate;
65     }
66
67     /**
68      * loggedInTemplate parameter defines the template whose contents will replace
69      * this tag in the layout if the user is already logged into the system.
70      */
71     private String JavaDoc loggedInTemplate;
72
73     /**
74      * The setter for loggedInTemplate parameter
75      */
76     public void setLoggedInTemplate(String JavaDoc loggedInTemplate)
77     {
78         this.loggedInTemplate = loggedInTemplate;
79     }
80
81
82     /**
83      * Method called when the tag is encountered to send the navigation
84      * template's contents to the output stream
85      *
86      * @return SKIP_BODY, as it is intended to be a single tag.
87      */
88     public int doStartTag() throws JspException JavaDoc
89     {
90         String JavaDoc template = defaultTemplate;
91         String JavaDoc module = null;
92
93         RunData data = (RunData)pageContext.getAttribute(JspService.RUNDATA, PageContext.REQUEST_SCOPE);
94         try
95         {
96             /* LOGGED_IN */
97             if ( (data != null) && (data.getUser() != null) && data.getUser().hasLoggedIn() && (loggedInTemplate != null) )
98               template = loggedInTemplate;
99
100             data.getTemplateInfo().setNavigationTemplate(
101                         TemplateLocator.locateNavigationTemplate(data,template));
102
103             pageContext.getOut().flush();
104             module = ((TemplateService)TurbineServices.getInstance().getService(
105             TemplateService.SERVICE_NAME)).getNavigationName(template);
106             NavigationLoader.getInstance().exec(data, module);
107         }
108         catch (Exception JavaDoc e)
109         {
110             String JavaDoc message = "Error processing navigation template:" + template + " using module: " + module;
111             logger.error(message, e);
112             try
113             {
114                 data.getOut().print("Error processing navigation template: " + template + " using module: " + module);
115             }
116             catch(java.io.IOException JavaDoc ioe) {}
117         }
118         return SKIP_BODY;
119     }
120 }
121
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