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Java > Open Source Codes > org > apache > struts > taglib > logic > NotPresentTag


1 /*
2  * $Id: NotPresentTag.java 54929 2004-10-16 16:38:42Z germuska $
3  *
4  * Copyright 1999-2004 The Apache Software Foundation.
5  *
6  * Licensed under the Apache License, Version 2.0 (the "License");
7  * you may not use this file except in compliance with the License.
8  * You may obtain a copy of the License at
9  *
10  * http://www.apache.org/licenses/LICENSE-2.0
11  *
12  * Unless required by applicable law or agreed to in writing, software
13  * distributed under the License is distributed on an "AS IS" BASIS,
14  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
15  * See the License for the specific language governing permissions and
16  * limitations under the License.
17  */
18
19
20 package org.apache.struts.taglib.logic;
21
22
23 import javax.servlet.jsp.JspException JavaDoc;
24
25
26 /**
27  * Evalute the nested body content of this tag if the specified value
28  * is not present for this request.
29  *
30  * @version $Rev: 54929 $ $Date: 2004-10-16 17:38:42 +0100 (Sat, 16 Oct 2004) $
31  */
32
33 public class NotPresentTag extends PresentTag {
34
35
36     // ------------------------------------------------------ Protected Methods
37
38
39     /**
40      * Evaluate the condition that is being tested by this particular tag,
41      * and return <code>true</code> if the nested body content of this tag
42      * should be evaluated, or <code>false</code> if it should be skipped.
43      * This method must be implemented by concrete subclasses.
44      *
45      * @exception JspException if a JSP exception occurs
46      */
47     protected boolean condition() throws JspException JavaDoc {
48
49         return (condition(false));
50
51     }
52
53
54 }
55
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