IfTag


1   /*****************************************
2    *                                       *
3    *  JBoss Portal: The OpenSource Portal  *
4    *                                       *
5    *   Distributable under LGPL license.   *
6    *   See terms of license at gnu.org.    *
7    *                                       *
8    *****************************************/
9   package org.jboss.portal.core.servlet.jsp.taglib;
10  
11  import java.util.Iterator  ;
12  import java.util.LinkedList  ;
13  
14  import javax.servlet.jsp.JspException  ;
15  import javax.servlet.jsp.tagext.TagSupport  ;
16  
17  import org.jboss.portal.common.context.Context;
18  import org.jboss.portal.common.context.NamedContext;
19  import org.jboss.portal.core.servlet.jsp.PortalJsp;
20  
21  /**
22   * Include a piece of code or not according to a condition
23   * @author <a HREF="theute@jboss.org">Thomas Heute</a>
24   * $Revision: 1.2 $
25   */
26  public class IfTag
27        extends TagSupport  
28  {
29     /**
30      * Context of the section
31      */
32     private String   ctx;
33  
34     private Iterator   children;
35     
36     private LinkedList   contextStack;
37     
38     private boolean include = false;
39     
40     /**
41      * @param ctx The ctx to set.
42      */
43     public void setCtx(String   ctx)
44     {
45        this.ctx = ctx;
46     }
47  
48     
49     public int doStartTag() throws JspException  
50     {
51        contextStack = (LinkedList  )PortalJsp.contextStack.get();
52        
53        // If no context has been set
54        if (contextStack.isEmpty()) {
55           include = false;
56           PortalJsp.log.debug("No context has been found");
57           return SKIP_BODY;
58        }
59        
60        Context currentContext = ((NamedContext)contextStack.getLast()).getContext();
61        children = currentContext.childIterator(ctx);
62        
63        if (children.hasNext())
64        {
65           include = true;
66           contextStack.addLast(new NamedContext(ctx, (Context)children.next()));
67           return EVAL_PAGE;
68        } else {
69           include = false;
70           return SKIP_BODY;
71        }      
72     }   
73     
74     public int doEndTag() {
75        if (include) {
76           contextStack.removeLast();
77        }
78        return SKIP_BODY;
79     }
80  
81     
82     /*
83     private String isTrue;
84     private String isFalse;
85     
86     
87     public int doStartTag() throws JspException {
88        ServletRequest servletRequest = pageContext.getRequest();
89        try {
90          System.out.println("Hello:" + isTrue);
91          PortletRequest portletRequest = (PortletRequest)servletRequest.getAttribute("javax.portlet.request");
92          Enumeration enum2 = portletRequest.getPreferences().getNames();
93          System.out.println("<<<<<< PorletPreferences");
94          while (enum2.hasMoreElements()) {
95             System.out.println(enum2.nextElement());
96          }
97          System.out.println(">>>>>> PorletPreferences");
98          
99          
100       } catch (Exception ex) {
101         throw new JspTagException("SimpleTag: " + 
102           ex.getMessage());
103       }
104       return SKIP_BODY;
105     }
106    
107     public int doEndTag() {
108       return EVAL_PAGE;
109     }
110     
111    public void setIsFalse(String isFalse)
112    {
113       this.isFalse = isFalse;
114    }
115 
116       public void setIsTrue(String isTrue)
117    {
118       this.isTrue = isTrue;
119    }
120    */
121 }
122
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