1 /*
2 * Copyright (c) 2003 Scott Howlett & Paul Libbrecht.
3 * All rights reserved.
4 *
5 * Redistribution and use in source and binary forms, with or without
6 * modification, are permitted provided that the following conditions
7 * are met:
8 *
9 * 1. Redistributions of source code must retain the above copyright
10 * notice, this list of conditions and the following disclaimer.
11 *
12 * 2. Redistributions in binary form must reproduce the above copyright
13 * notice, this list of conditions and the following disclaimer in
14 * the documentation and/or other materials provided with the
15 * distribution.
16 *
17 * 3. The end-user documentation included with the redistribution,
18 * if any, must include the following acknowledgment:
19 * "This product includes software developed by the Xwing
20 * Project ( http://xwing.sourceforge.net/ )."
21 * Alternately, this acknowledgment may appear in the software itself,
22 * if and wherever such third-party acknowledgments normally appear.
23 *
24 * 4. The name "Xwing" must not be used to endorse or promote products
25 * derived from this software without prior written permission. For
26 * written permission, please contact the project authors via
27 * the Xwing project site, http://xwing.sourceforge.net/ .
28 *
29 * 5. Products derived from this software may not be called "Xwing",
30 * nor may "Xwing" appear in their name, without prior written
31 * permission of the Xwing project.
32 *
33 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
34 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
35 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
36 * DISCLAIMED. IN NO EVENT SHALL THE XWING AUTHORS OR THE PROJECT
37 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
38 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
39 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
40 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
41 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
42 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
43 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
44 * SUCH DAMAGE.
45 *
46 * For more information on Xwing, please see
47 * < http://xwing.sourceforge.net/ >.
48 */
49 package net.sourceforge.xwing.jelly.tags.dom;
50
51 import org.apache.commons.jelly.JellyTagException;
52 import org.apache.commons.jelly.MissingAttributeException;
53 import org.apache.commons.jelly.TagSupport;
54 import org.apache.commons.jelly.XMLOutput;
55 import org.jaxen.dom.DOMXPath;
56
57 public class SetTag extends TagSupport {
58
59 private String var;
60 private String select;
61 private String type;
62 private Object xmlContext;
63
64 public void setVar(String var) {
65 this.var = var;
66 }
67
68 public void setSelect(String select) {
69 this.select = select;
70 }
71
72 public void setType(String type) {
73 this.type = type;
74 }
75
76 public void setXmlContext(Object xmlContext) {
77 this.xmlContext = xmlContext;
78 }
79
80 public void doTag(XMLOutput output)
81 throws MissingAttributeException, JellyTagException {
82
83 if (var == null) {
84 throw new MissingAttributeException("var");
85 }
86 if (xmlContext == null) {
87 throw new MissingAttributeException("xmlContext");
88 }
89 if (select == null) {
90 throw new MissingAttributeException("select");
91 }
92
93 try {
94 Object result = null;
95
96 if (type == null) {
97 result = new DOMXPath(select).evaluate(xmlContext);
98 } else if ("node".equals(type)) {
99 result = new DOMXPath(select).selectSingleNode(xmlContext);
100 } else if ("nodes".equals(type)) {
101 result = new DOMXPath(select).selectNodes(xmlContext);
102 } else if ("string".equals(type)) {
103 result = new DOMXPath(select).stringValueOf(xmlContext);
104 } else if ("number".equals(type)) {
105 result = new DOMXPath(select).numberValueOf(xmlContext);
106 } else if ("boolean".equals(type)) {
107 result =
108 new DOMXPath(select).booleanValueOf(xmlContext)
109 ? Boolean.TRUE
110 : Boolean.FALSE;
111 } else {
112 throw new JellyTagException(
113 "type must be null or one of "
114 + "node, nodes, string, number, boolean");
115 }
116
117 context.setVariable(var, result);
118 } catch (JellyTagException exc) {
119 throw exc;
120 } catch (Exception exc) {
121 throw new JellyTagException(exc);
122 }
123 }
124 }
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