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


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 javax.servlet.jsp.tagext.*;
57 import com.Yasna.forum.*;
58 import javax.servlet.jsp.*;
59
60 /**
61  * Jsp tag must be nested in Message tag. Evaluates its body if current message
62  * is approved. Tag body is evaluated also if message is not approved but tag
63  * parameter value set to "false".
64  */
65 public class IsApprovedTag extends TagSupport {
66
67     private boolean value = true;
68     private boolean attrSet = false;
69
70     public int doStartTag() throws JspException {
71         if (!attrSet) {
72             value = true;
73         }
74         attrSet = false;
75         try {
76             MessageTag mt = getMessageTag();
77             if (mt.isApproved() == value) {
78                 return EVAL_BODY_INCLUDE;
79             }
80         } catch(Exception JavaDoc e) {
81         }
82         return SKIP_BODY;
83     }
84
85     /**
86      * Gets MessageTag object which represents the parent Message tag.
87      * @return MessageTag object
88      */
89     private MessageTag getMessageTag() {
90         MessageTag mt = null;
91         try {
92             mt = (MessageTag)this.findAncestorWithClass(this,
93                 Class.forName("com.Yasna.forum.tags.MessageTag"));
94         } catch(Exception JavaDoc e) {
95         }
96         return mt;
97     }
98
99     /**
100      * Set the tag parameter to a certain value.
101      * @param v String representation of the parameter value.
102      */
103     public void setValue(String JavaDoc v) {
104         attrSet = true;
105         value = true;
106         if ("false".equals(v)) value = false;
107     }
108
109 }
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