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Java > Open Source Codes > org > apache > taglibs > xtags > xpath > 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
17 package org.apache.taglibs.xtags.xpath;
18
19 import java.util.List JavaDoc;
20
21 import javax.servlet.jsp.JspException JavaDoc;
22
23 import org.dom4j.Node;
24 import org.dom4j.NodeFilter;
25 import org.dom4j.DocumentHelper;
26
27 /** Behaves like the equivalent XSLT tag.
28   *
29   * @author James Strachan
30   * @version $Revision: 1.2 $
31   */
32 public class IfTag extends AbstractTag {
33     
34     /** Stores the XPath filter to evaluate */
35     private NodeFilter nodeFilter;
36     
37
38     public IfTag() {
39     }
40     
41     // BodyTag interface
42 //-------------------------------------------------------------------------
43 public int doStartTag() throws JspException JavaDoc {
44         if ( evaluate() ) {
45             return EVAL_BODY_INCLUDE;
46         }
47         return SKIP_BODY;
48     }
49     
50     // Properties
51 //-------------------------------------------------------------------------
52 public boolean evaluate() throws JspException JavaDoc {
53         if ( nodeFilter != null ) {
54             return matches( nodeFilter );
55         }
56         return false;
57     }
58
59     public void setTest( String JavaDoc test ) {
60         nodeFilter = createXPathFilter( test );
61     }
62     
63     public void setFilter( NodeFilter nodeFilter ) {
64         this.nodeFilter = nodeFilter;
65     }
66 }
67
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