1 /*
2 * $Header: /home/cvs/jakarta-commons-sandbox/jelly/src/java/org/apache/commons/jelly/tags/xml/SetTag.java,v 1.8 2002/06/18 12:30:10 jstrachan Exp $
3 * $Revision: 1.8 $
4 * $Date: 2002/06/18 12:30:10 $
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: SetTag.java,v 1.8 2002/06/18 12:30:10 jstrachan Exp $
61 */
62 package org.apache.commons.jelly.tags.xml;
63
64 import java.io.Writer;
65
66 import org.apache.commons.jelly.JellyContext;
67 import org.apache.commons.jelly.MissingAttributeException;
68 import org.apache.commons.jelly.Script;
69 import org.apache.commons.jelly.TagSupport;
70 import org.apache.commons.jelly.XMLOutput;
71
72 import org.apache.commons.logging.Log;
73 import org.apache.commons.logging.LogFactory;
74
75 import org.jaxen.XPath;
76
77 /*** A tag which defines a variable from an XPath expression
78 *
79 * @author <a href="mailto:jstrachan@apache.org">James Strachan</a>
80 * @version $Revision: 1.8 $
81 */
82 public class SetTag extends XPathTagSupport {
83
84 /*** The Log to which logging calls will be made. */
85 private Log log = LogFactory.getLog(SetTag.class);
86
87 /*** The variable name to export. */
88 private String var;
89
90 /*** The XPath expression to evaluate. */
91 private XPath select;
92
93 public SetTag() {
94 }
95
96 // Tag interface
97 //-------------------------------------------------------------------------
98 public void doTag(XMLOutput output) throws Exception {
99 if (var == null) {
100 throw new MissingAttributeException( "var" );
101 }
102 if (select == null) {
103 throw new MissingAttributeException( "select" );
104 }
105
106 Object xpathContext = getXPathContext();
107 Object value = select.evaluate(xpathContext);
108
109 //log.info( "Evaluated xpath: " + select + " as: " + value + " of type: " + value.getClass().getName() );
110
111 context.setVariable(var, value);
112 }
113
114 // Properties
115 //-------------------------------------------------------------------------
116
117 /*** Sets the variable name to define for this expression
118 */
119 public void setVar(String var) {
120 this.var = var;
121 }
122
123 /*** Sets the XPath expression to evaluate. */
124 public void setSelect(XPath select) {
125 this.select = select;
126 }
127 }
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