1 /*
2 * $Header: /home/cvs/jakarta-commons-sandbox/jelly/src/java/org/apache/commons/jelly/tags/xml/XPathExpression.java,v 1.6 2002/08/09 14:40:13 jstrachan Exp $
3 * $Revision: 1.6 $
4 * $Date: 2002/08/09 14:40:13 $
5 *
6 * ====================================================================
7 *
8 * The Apache Software License, Version 1.1
9 *
10 * Copyright (c) 1999-2002 The Apache Software Foundation. All rights
11 * reserved.
12 *
13 * Redistribution and use in source and binary forms, with or without
14 * modification, are permitted provided that the following conditions
15 * are met:
16 *
17 * 1. Redistributions of source code must retain the above copyright
18 * notice, this list of conditions and the following disclaimer.
19 *
20 * 2. Redistributions in binary form must reproduce the above copyright
21 * notice, this list of conditions and the following disclaimer in
22 * the documentation and/or other materials provided with the
23 * distribution.
24 *
25 * 3. The end-user documentation included with the redistribution, if
26 * any, must include the following acknowlegement:
27 * "This product includes software developed by the
28 * Apache Software Foundation (http://www.apache.org/)."
29 * Alternately, this acknowlegement may appear in the software itself,
30 * if and wherever such third-party acknowlegements normally appear.
31 *
32 * 4. The names "The Jakarta Project", "Commons", and "Apache Software
33 * Foundation" must not be used to endorse or promote products derived
34 * from this software without prior written permission. For written
35 * permission, please contact apache@apache.org.
36 *
37 * 5. Products derived from this software may not be called "Apache"
38 * nor may "Apache" appear in their names without prior written
39 * permission of the Apache Group.
40 *
41 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
42 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
43 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
44 * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
45 * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
46 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
47 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
48 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
49 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
50 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
51 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
52 * SUCH DAMAGE.
53 * ====================================================================
54 *
55 * This software consists of voluntary contributions made by many
56 * individuals on behalf of the Apache Software Foundation. For more
57 * information on the Apache Software Foundation, please see
58 * <http://www.apache.org/>.
59 *
60 * $Id: XPathExpression.java,v 1.6 2002/08/09 14:40:13 jstrachan Exp $
61 */
62 package org.apache.commons.jelly.tags.xml;
63
64 import java.io.IOException;
65 import java.io.Writer;
66
67 import org.apache.commons.jelly.JellyContext;
68 import org.apache.commons.jelly.Script;
69 import org.apache.commons.jelly.Tag;
70 import org.apache.commons.jelly.expression.ExpressionSupport;
71
72 import org.jaxen.XPath;
73 import org.jaxen.VariableContext;
74
75 /*** An expression which returns an XPath object.
76 *
77 * @author <a href="mailto:jstrachan@apache.org">James Strachan</a>
78 * @version $Revision: 1.6 $
79 */
80 public class XPathExpression extends ExpressionSupport implements VariableContext {
81
82 private XPath xpath;
83 private JellyContext context;
84
85 public XPathExpression() {
86 }
87
88 public XPathExpression(XPath xpath) {
89 this.xpath = xpath;
90 }
91
92 public String toString() {
93 return xpath.toString();
94 }
95
96 // Expression interface
97 //-------------------------------------------------------------------------
98 public Object evaluate(JellyContext context) {
99 this.context = context;
100 xpath.setVariableContext(this);
101 return xpath;
102 }
103
104 // VariableContext interface
105 //-------------------------------------------------------------------------
106 public Object getVariableValue(
107 String namespaceURI,
108 String prefix,
109 String localName) {
110
111 Object value = context.getVariable(localName);
112
113 //log.debug( "Looking up XPath variable of name: " + localName + " value is: " + value );
114
115 return value;
116 }
117 }
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