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Java > Open Source Codes > org > apache > taglibs > xtags > xpath > ContextTag


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 javax.servlet.jsp.JspException JavaDoc;
20
21 import org.dom4j.XPath;
22
23 /** A tag which changes the current context for tags used inside its body.
24   * It is similar to the <forEach> tag except no looping is performed.
25   *
26   * @author James Strachan
27   */

28 public class ContextTag extends ForEachTag {
29     
30     private boolean firstIteration;
31     
32     public ContextTag() {
33     }
34
35     
36     // BodyTag interface
37
//-------------------------------------------------------------------------
38
public int doStartTag() throws JspException JavaDoc {
39         firstIteration = true;
40         return super.doStartTag();
41     }
42
43     /** Performs an iteration and defines a variable of the current object */
44     protected boolean hasNext() {
45         if ( firstIteration ) {
46             firstIteration = false;
47             super.hasNext();
48             return true;
49         }
50         return false;
51     }
52     
53 }
54
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