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Java > Open Source Codes > org > openlaszlo > iv > flash > xml > apache > XPathProcessorImpl


1 /*
2  * $Id: XPathProcessorImpl.java,v 1.3 2002/02/24 02:10:19 skavish Exp $
3  *
4  * ===========================================================================
5  *
6  * The JGenerator Software License, Version 1.0
7  *
8  * Copyright (c) 2000 Dmitry Skavish (skavish@usa.net). All rights reserved.
9  *
10  * Redistribution and use in source and binary forms, with or without
11  * modification, are permitted provided that the following conditions are met:
12  *
13  * 1. Redistributions of source code must retain the above copyright
14  * notice, this list of conditions and the following disclaimer.
15  *
16  * 2. Redistributions in binary form must reproduce the above copyright
17  * notice, this list of conditions and the following disclaimer in
18  * the documentation and/or other materials provided with the
19  * distribution.
20  *
21  * 3. The end-user documentation included with the redistribution, if
22  * any, must include the following acknowlegement:
23  * "This product includes software developed by Dmitry Skavish
24  * (skavish@usa.net, http://www.flashgap.com/)."
25  * Alternately, this acknowlegement may appear in the software itself,
26  * if and wherever such third-party acknowlegements normally appear.
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28  * 4. The name "The JGenerator" must not be used to endorse or promote
29  * products derived from this software without prior written permission.
30  * For written permission, please contact skavish@usa.net.
31  *
32  * 5. Products derived from this software may not be called "The JGenerator"
33  * nor may "The JGenerator" appear in their names without prior written
34  * permission of Dmitry Skavish.
35  *
36  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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40  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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50
51 package org.openlaszlo.iv.flash.xml.apache;
52
53 import org.openlaszlo.iv.flash.xml.*;
54
55 import java.util.*;
56 import javax.xml.transform.TransformerException JavaDoc;
57
58 import org.w3c.dom.*;
59 import org.apache.xpath.*;
60
61 /**
62  * XPath processor
63  * <P>
64  * Provides various methods for XPath processing
65  *
66  * @author Dmitry Skavish
67  */
68 public class XPathProcessorImpl implements XPathProcessor {
69
70     /**
71      * Evaluates XPath to list of nodes.
72      *
73      * @param expr XPath expression
74      * @param node xml node to evaluated on
75      * @return result of xpath execution - iterator on nodes
76      * @exception Exception
77      */
78     public Iterator selectNodeList(String JavaDoc expr, Node node) throws TransformerException JavaDoc {
79         //final NodeList list = XPathAPI.selectNodeList(node, expr);
80 final NodeList list = XPathHelper.selectNodeList(new XPathContext(), node, expr);
81         final int n = list.getLength();
82         return new Iterator() {
83                 int cur = 0;
84                 public boolean hasNext() {
85                     return cur < n;
86                 }
87                 public Object JavaDoc next() {
88                     if( !hasNext() ) throw new NoSuchElementException();
89                     return list.item(cur++);
90                 }
91                 public void remove() {
92                 }
93             };
94     }
95
96     /**
97      * Evaluates XPath to one node.
98      *
99      * @param expr XPath expression
100      * @param node xml node to be evaluated on
101      * @return xml node
102      * @exception Exception
103      */
104     public Node selectSingleNode(String JavaDoc expr, Node node) throws TransformerException JavaDoc {
105         //return XPathAPI.selectSingleNode(node, expr);
106 return XPathHelper.selectSingleNode(new XPathContext(), node, expr);
107     }
108 }
109
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