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Java > Open Source Codes > com > Yasna > forum > tags > ForumsLoopTag


1 /**
2  * Copyright (C) 2001 Yasna.com. All rights reserved.
3  *
4  * ===================================================================
5  * The Apache Software License, Version 1.1
6  *
7  * Redistribution and use in source and binary forms, with or without
8  * modification, are permitted provided that the following conditions
9  * are met:
10  *
11  * 1. Redistributions of source code must retain the above copyright
12  * notice, this list of conditions and the following disclaimer.
13  *
14  * 2. Redistributions in binary form must reproduce the above copyright
15  * notice, this list of conditions and the following disclaimer in
16  * the documentation and/or other materials provided with the
17  * distribution.
18  *
19  * 3. The end-user documentation included with the redistribution,
20  * if any, must include the following acknowledgment:
21  * "This product includes software developed by
22  * Yasna.com (http://www.yasna.com)."
23  * Alternately, this acknowledgment may appear in the software itself,
24  * if and wherever such third-party acknowledgments normally appear.
25  *
26  * 4. The names "Yazd" and "Yasna.com" must not be used to
27  * endorse or promote products derived from this software without
28  * prior written permission. For written permission, please
29  * contact yazd@yasna.com.
30  *
31  * 5. Products derived from this software may not be called "Yazd",
32  * nor may "Yazd" appear in their name, without prior written
33  * permission of Yasna.com.
34  *
35  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
36  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
37  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
38  * DISCLAIMED. IN NO EVENT SHALL YASNA.COM OR
39  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
40  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
41  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
42  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
43  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
44  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
45  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
46  * SUCH DAMAGE.
47  * ====================================================================
48  *
49  * This software consists of voluntary contributions made by many
50  * individuals on behalf of Yasna.com. For more information
51  * on Yasna.com, please see <http://www.yasna.com>.
52  */

53
54 package com.Yasna.forum.tags;
55
56 import java.io.*;
57 import java.util.*;
58 import javax.servlet.*;
59 import javax.servlet.jsp.*;
60 import javax.servlet.jsp.tagext.*;
61 import javax.servlet.http.*;
62 import com.Yasna.forum.*;
63 import com.Yasna.forum.tags.*;
64
65 /**
66  * Loops through forums in current group. Must be nested in GroupsLoop tag.
67  */

68 public class ForumsLoopTag extends TagSupport implements BooleanTag
69 {
70
71   private GroupsLoopTag g = null;
72   private ForumGroup forumGroup;
73   private boolean hasForums;
74   private Iterator forumIterator;
75   private Forum forum;
76
77   public final int doStartTag() throws JspException
78   {
79     g = getParentGroup();
80     forumGroup = g.getGroup();
81     forumIterator = forumGroup.forums();
82     hasForums = forumIterator.hasNext();
83     if (hasForums) {
84         forum = (Forum) forumIterator.next();
85     }
86     return EVAL_BODY_INCLUDE;
87   }
88
89   /**
90    * Gets parent GroupLoopTag object which represents the parent GroupLoop tag.
91    * @return GroupsLoopTag object.
92    */

93   private GroupsLoopTag getParentGroup() {
94     GroupsLoopTag g = null;
95     try {
96       g = (GroupsLoopTag)this.findAncestorWithClass(this,
97         Class.forName("com.Yasna.forum.tags.GroupsLoopTag"));
98     } catch(Exception JavaDoc e) {
99     }
100     return g;
101   }
102
103   public final int doAfterBody() throws JspException
104   {
105     if (forumIterator.hasNext()) {
106         forum = (Forum) forumIterator.next();
107         return EVAL_BODY_AGAIN;
108     } else {
109         return SKIP_BODY;
110     }
111   }
112
113   public final int doEndTag() throws JspException
114   {
115     return EVAL_PAGE;
116   }
117
118   public boolean getValue() {
119       return hasForums;
120   }
121
122   /**
123    * Retrieve current forum.
124    * @return Forum object.
125    */

126   public Forum getForum() {
127       return forum;
128   }
129
130 }
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