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Java > Open Source Codes > org > openlaszlo > iv > flash > xml > caucho > 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.
27  *
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
37  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
38  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
39  * DISCLAIMED. IN NO EVENT SHALL DMITRY SKAVISH OR THE OTHER
40  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
41  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
42  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
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44  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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49  */
50
51 package org.openlaszlo.iv.flash.xml.caucho;
52
53 import org.openlaszlo.iv.flash.xml.*;
54
55 import java.util.Iterator JavaDoc;
56 import org.w3c.dom.*;
57 import javax.xml.transform.TransformerException JavaDoc;
58
59 import com.caucho.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 JavaDoc selectNodeList(String JavaDoc expr, Node node) throws TransformerException JavaDoc {
79         try {
80             //org.openlaszlo.iv.flash.util.Log.info("selectNodeList("+expr+", node="+node.getNodeName()+")");
81 return XPath.select(expr, node);
82         } catch( XPathException e ) {
83             throw new TransformerException JavaDoc(e);
84         }
85     }
86
87     /**
88      * Evaluates XPath to one node.
89      *
90      * @param expr XPath expression
91      * @param node xml node to be evaluated on
92      * @return xml node
93      * @exception Exception
94      */
95     public Node selectSingleNode(String JavaDoc expr, Node node) throws TransformerException JavaDoc {
96         try {
97             //org.openlaszlo.iv.flash.util.Log.info("selectSingleNode("+expr+", node="+node.getNodeName()+")");
98 Iterator JavaDoc it = XPath.select(expr, node);
99             if( it.hasNext() ) return (Node) it.next();
100             return null;
101         } catch( XPathException e ) {
102             throw new TransformerException JavaDoc(e);
103         }
104     }
105 }
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