1 /*
2 * $Header$
3 * $Revision$
4 * $Date$
5 *
6 * ====================================================================
7 *
8 * Copyright (C) 2005 Elliotte Rusty Harold.
9 * All rights reserved.
10 *
11 * Redistribution and use in source and binary forms, with or without
12 * modification, are permitted provided that the following conditions
13 * are met:
14 *
15 * 1. Redistributions of source code must retain the above copyright
16 * notice, this list of conditions, and the following disclaimer.
17 *
18 * 2. Redistributions in binary form must reproduce the above copyright
19 * notice, this list of conditions, and the disclaimer that follows
20 * these conditions in the documentation and/or other materials
21 * provided with the distribution.
22 *
23 * 3. The name "Jaxen" must not be used to endorse or promote products
24 * derived from this software without prior written permission. For
25 * written permission, please contact license@jaxen.org.
26 *
27 * 4. Products derived from this software may not be called "Jaxen", nor
28 * may "Jaxen" appear in their name, without prior written permission
29 * from the Jaxen Project Management (pm@jaxen.org).
30 *
31 * In addition, we request (but do not require) that you include in the
32 * end-user documentation provided with the redistribution and/or in the
33 * software itself an acknowledgement equivalent to the following:
34 * "This product includes software developed by the
35 * Jaxen Project (http://www.jaxen.org/)."
36 * Alternatively, the acknowledgment may be graphical using the logos
37 * available at http://www.jaxen.org/
38 *
39 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
40 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
41 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
42 * DISCLAIMED. IN NO EVENT SHALL THE Jaxen AUTHORS OR THE PROJECT
43 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
44 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
45 * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
46 * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
47 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
48 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
49 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
50 * SUCH DAMAGE.
51 *
52 * ====================================================================
53 * This software consists of voluntary contributions made by many
54 * individuals on behalf of the Jaxen Project and was originally
55 * created by bob mcwhirter <bob@werken.com> and
56 * James Strachan <jstrachan@apache.org>. For more information on the
57 * Jaxen Project, please see <http://www.jaxen.org/>.
58 *
59 * $Id$
60 */
61
62 package org.jaxen.function;
63
64 import java.util.Iterator;
65 import java.util.List;
66
67 import javax.xml.parsers.DocumentBuilder;
68 import javax.xml.parsers.DocumentBuilderFactory;
69 import javax.xml.parsers.ParserConfigurationException;
70
71 import junit.framework.TestCase;
72
73 import org.jaxen.*;
74 import org.jaxen.dom.DOMXPath;
75 import org.w3c.dom.Document;
76
77 /***
78 * @author Elliotte Rusty Harold
79 *
80 */
81 public class ExtensionFunctionTest extends TestCase {
82
83 private Document doc;
84
85 public void setUp() throws ParserConfigurationException
86 {
87 DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
88 factory.setNamespaceAware(true);
89 DocumentBuilder builder = factory.newDocumentBuilder();
90 doc = builder.newDocument();
91 }
92
93
94 public ExtensionFunctionTest(String name) {
95 super(name);
96 }
97
98 class MinFunction implements Function {
99
100 public Object call(Context context, List args) {
101
102 if (args.isEmpty()) return new Double(Double.NaN);
103
104 Navigator navigator = context.getNavigator();
105 double min = Double.MAX_VALUE;
106 Iterator iterator = args.iterator();
107 while (iterator.hasNext()) {
108 double next = NumberFunction.evaluate(iterator.next(), navigator).doubleValue();
109 min = Math.min(min, next);
110 }
111 return new Double(min);
112 }
113
114 }
115
116
117 public void testRegisterExtensionFunction() throws JaxenException {
118
119 SimpleFunctionContext fc = new XPathFunctionContext(false);
120 fc.registerFunction("http://exslt.org/math", "min", new MinFunction());
121
122 SimpleNamespaceContext nc = new SimpleNamespaceContext();
123 nc.addNamespace("math", "http://exslt.org/math");
124
125 BaseXPath xpath = new DOMXPath("math:min(//x)");
126
127 xpath.setFunctionContext(fc);
128 xpath.setNamespaceContext(nc);
129
130 org.w3c.dom.Element a = doc.createElementNS("", "a");
131 org.w3c.dom.Element b = doc.createElementNS("", "b");
132 doc.appendChild(a);
133 a.appendChild(b);
134 org.w3c.dom.Element x2 = doc.createElementNS("", "x");
135 org.w3c.dom.Element x3 = doc.createElementNS("", "x");
136 org.w3c.dom.Element x4 = doc.createElementNS("", "x");
137 a.appendChild(x4);
138 b.appendChild(x2);
139 b.appendChild(x3);
140 x2.appendChild(doc.createTextNode("2"));
141 x3.appendChild(doc.createTextNode("3"));
142 x4.appendChild(doc.createTextNode("4"));
143
144 Double result = (Double) xpath.evaluate(doc);
145 assertEquals(new Double(2), result);
146
147
148 }
149
150
151 }