1 /*
2 * $Header: /home/cvs/jakarta-commons-sandbox/jelly/src/java/org/apache/commons/jelly/tags/xml/ExprTag.java,v 1.8 2002/05/20 10:09:28 jstrachan Exp $
3 * $Revision: 1.8 $
4 * $Date: 2002/05/20 10:09:28 $
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: ExprTag.java,v 1.8 2002/05/20 10:09:28 jstrachan Exp $
61 */
62 package org.apache.commons.jelly.tags.xml;
63
64 import java.util.Iterator;
65 import java.util.List;
66
67 import org.apache.commons.jelly.JellyContext;
68 import org.apache.commons.jelly.MissingAttributeException;
69 import org.apache.commons.jelly.TagSupport;
70 import org.apache.commons.jelly.XMLOutput;
71
72 import org.dom4j.Node;
73 import org.dom4j.io.SAXWriter;
74
75 import org.jaxen.XPath;
76
77 /*** A tag which performs a copy-of operation like the XSLT tag
78 *
79 * @author James Strachan
80 */
81 public class CopyOfTag extends XPathTagSupport {
82
83 /*** The XPath expression to evaluate. */
84 private XPath select;
85
86 public CopyOfTag() {
87 }
88
89 // Tag interface
90 //-------------------------------------------------------------------------
91 public void doTag(XMLOutput output) throws Exception {
92 Object xpathContext = getXPathContext();
93
94 if (select == null) {
95 throw new MissingAttributeException( "select" );
96 }
97
98 SAXWriter saxWriter = new SAXWriter(output, output);
99 List nodes = select.selectNodes(xpathContext);
100 for (Iterator iter = nodes.iterator(); iter.hasNext(); ) {
101 Object object = iter.next();
102 if ( object instanceof Node ) {
103 saxWriter.write( (Node) object );
104 }
105 else if (object != null ) {
106 output.write( object.toString() );
107 }
108 }
109 }
110
111 // Properties
112 //-------------------------------------------------------------------------
113 /*** Sets the XPath expression to evaluate. */
114 public void setSelect(XPath select) {
115 this.select = select;
116 }
117 }
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