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


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 com.Yasna.forum.*;
57 import javax.servlet.jsp.*;
58 import javax.servlet.jsp.tagext.*;
59 import java.io.*;
60
61 /**
62  * Used as nested tag in ancestors of BooleanTag interface.
63  * Takes one parameter [value]. If [value] value equals the string
64  * "true" then it is interprited as boolean value equal to [true]. All other values
65  * different from "true" are interpreted as the boolean [false].
66  * Tag body is evaluated if the interpreted boolean value given to its
67  * parameter [value] equals to the parent's BooleanTag.getValue() value.
68  */

69 public class CaseTag extends TagSupport {
70
71     private boolean caseValue;
72
73     public int doStartTag() throws JspException {
74         BooleanTag bt = null;
75         try {
76             bt = (BooleanTag)this.findAncestorWithClass(this,
77                 Class.forName("com.Yasna.forum.tags.BooleanTag"));
78             if (bt.getValue() == caseValue) return EVAL_BODY_INCLUDE;
79         } catch (Exception JavaDoc e) {
80         }
81         return SKIP_BODY;
82     }
83
84     public void setValue(String JavaDoc caseValue) {
85         this.caseValue = "true".equals(caseValue);
86     }
87
88 }
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