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Java > Open Source Codes > org > apache > taglibs > utility > lang > IfTag


1 /*
2  * Copyright 1999,2004 The Apache Software Foundation.
3  *
4  * Licensed under the Apache License, Version 2.0 (the "License");
5  * you may not use this file except in compliance with the License.
6  * You may obtain a copy of the License at
7  *
8  * http://www.apache.org/licenses/LICENSE-2.0
9  *
10  * Unless required by applicable law or agreed to in writing, software
11  * distributed under the License is distributed on an "AS IS" BASIS,
12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13  * See the License for the specific language governing permissions and
14  * limitations under the License.
15  */
16 package org.apache.taglibs.utility.lang;
17
18 import java.io.IOException JavaDoc;
19 import javax.servlet.jsp.*;
20 import javax.servlet.jsp.tagext.*;
21
22 /**
23  * This tag is a conditional If tag.
24  *
25  * Author Mandar Raje.
26  */
27
28 public class IfTag extends BodyTagSupport {
29     
30     private boolean predicate = false;
31     
32     public boolean getPredicate() {
33     return predicate;
34     }
35
36     public void setPredicate(boolean val) {
37     this.predicate = val;
38     }
39     
40     public int doStartTag() {
41     if (getPredicate()) return EVAL_BODY_TAG;
42     else return SKIP_BODY;
43     }
44
45     public int doAfterBody() throws JspException {
46         try {
47            bodyContent.writeOut(bodyContent.getEnclosingWriter());
48            return SKIP_BODY;
49         } catch (IOException JavaDoc ex) {
50             throw new JspTagException(ex.toString());
51         }
52     }
53
54 }
55
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