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


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 /**
55  * Copyright (C) 2000 CoolServlets.com. All rights reserved.
56  *
57  * ===================================================================
58  * The Apache Software License, Version 1.1
59  *
60  * Redistribution and use in source and binary forms, with or without
61  * modification, are permitted provided that the following conditions
62  * are met:
63  *
64  * 1. Redistributions of source code must retain the above copyright
65  * notice, this list of conditions and the following disclaimer.
66  *
67  * 2. Redistributions in binary form must reproduce the above copyright
68  * notice, this list of conditions and the following disclaimer in
69  * the documentation and/or other materials provided with the
70  * distribution.
71  *
72  * 3. The end-user documentation included with the redistribution,
73  * if any, must include the following acknowledgment:
74  * "This product includes software developed by
75  * CoolServlets.com (http://www.coolservlets.com)."
76  * Alternately, this acknowledgment may appear in the software itself,
77  * if and wherever such third-party acknowledgments normally appear.
78  *
79  * 4. The names "Jive" and "CoolServlets.com" must not be used to
80  * endorse or promote products derived from this software without
81  * prior written permission. For written permission, please
82  * contact webmaster@coolservlets.com.
83  *
84  * 5. Products derived from this software may not be called "Jive",
85  * nor may "Jive" appear in their name, without prior written
86  * permission of CoolServlets.com.
87  *
88  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
89  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
90  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
91  * DISCLAIMED. IN NO EVENT SHALL COOLSERVLETS.COM OR
92  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
93  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
94  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
95  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
96  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
97  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
98  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
99  * SUCH DAMAGE.
100  * ====================================================================
101  *
102  * This software consists of voluntary contributions made by many
103  * individuals on behalf of CoolServlets.com. For more information
104  * on CoolServlets.com, please see <http://www.coolservlets.com>.
105  */

106
107 package com.Yasna.forum.tags;
108
109 import java.io.*;
110 import java.util.*;
111 import java.text.*;
112 import javax.servlet.*;
113 import javax.servlet.jsp.*;
114 import javax.servlet.jsp.tagext.*;
115 import javax.servlet.http.*;
116 import com.Yasna.forum.*;
117 import com.Yasna.forum.tags.*;
118
119 /**
120  * JSP Tag <b>while_child</b>, used with the <b>walk</b> tag to iterate
121  * through a loop for each child (depth) message that exists.
122  * <p>
123  * Used to aide in generating properly formatted HTML when displaying
124  * messages while walking a thread of messages.
125  * <p>
126  * Must be nested inside a <b>walk</b> tag.
127  * <p>
128  * If there is another child message depth, includes body of tag.
129  * <p></pre>
130  * JSP Tag Lib Descriptor
131  * <p><pre>
132  * &lt;name&gt;while_child&lt;/name&gt;
133  * &lt;tagclass&gt;com.Yasna.forum.tags.WhileChildTag&lt;/tagclass&gt;
134  * &lt;bodycontent&gt;JSP&lt;/bodycontent&gt;
135  * &lt;info&gt;Loops for every child message.&lt;/info&gt;
136  * </pre>
137  *
138  * @see WalkTag
139  *
140  * @author Glenn Nielsen
141  */

142
143 public class WhileChildTag extends BodyTagSupport
144 {
145   private WalkTag wt = null;
146   private int thread_depth = 0;
147
148   /**
149    * Method called at start of while_child Tag
150    *
151    * @return either EVAL_BODY_TAG if there are more children or a SKIP_BODY
152    */

153   public final int doStartTag() throws JspException
154   {
155     // Get the parent walk tag
156
try {
157       wt = (WalkTag)this.findAncestorWithClass(this,
158         Class.forName("com.Yasna.forum.tags.WalkTag"));
159     } catch(Exception JavaDoc e) {
160       return SKIP_BODY;
161     }
162
163     // Get the thread depth
164
thread_depth = wt.getDepth();
165     if( thread_depth > 0 )
166       return EVAL_BODY_TAG;
167     return SKIP_BODY;
168   }
169
170   /**
171    * Method called at end of each iteration of while_child
172    *
173    * @return either EVAL_BODY_TAG if there are more children or a SKIP_BODY
174    */

175   public final int doAfterBody() throws JspException
176   {
177     thread_depth--;
178     if( thread_depth > 0 )
179       return EVAL_BODY_TAG;
180     return SKIP_BODY;
181   }
182
183   /**
184    * Method called at end of while_child Tag to output nested content
185    *
186    * @return EVAL_PAGE
187    */

188   public final int doEndTag() throws JspException
189   {
190     try
191     {
192       if(bodyContent != null)
193         bodyContent.writeOut(bodyContent.getEnclosingWriter());
194     } catch(java.io.IOException JavaDoc e)
195     {
196       throw new JspException("IO Error: " + e.getMessage());
197     }
198     return EVAL_PAGE;
199   }
200
201 }
202
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