1 package org.apache.jetspeed.services.jsp.tags;
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19 import javax.servlet.jsp.JspException;
20 import javax.servlet.jsp.PageContext;
21 import javax.servlet.jsp.tagext.TagSupport;
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25 import org.apache.jetspeed.services.TemplateLocator;
26
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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;
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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
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 defaultTemplate;
58
59 /***
60 * The setter for DefaultTemplate parameter
61 */
62 public void setDefaultTemplate(String 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 loggedInTemplate;
72
73 /***
74 * The setter for loggedInTemplate parameter
75 */
76 public void setLoggedInTemplate(String 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
89 {
90 String template = defaultTemplate;
91 String module = null;
92
93 RunData data = (RunData)pageContext.getAttribute(JspService.RUNDATA, PageContext.REQUEST_SCOPE);
94 try
95 {
96
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 e)
109 {
110 String 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 ioe) {}
117 }
118 return SKIP_BODY;
119 }
120 }