1   /*
2    * $Header$
3    * $Revision$
4    * $Date$
5    *
6    * ====================================================================
7    *
8    * Copyright 2005, 2006 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 are
13   * met:
14   * 
15   *   * Redistributions of source code must retain the above copyright
16   *     notice, this list of conditions and the following disclaimer.
17   * 
18   *   * Redistributions in binary form must reproduce the above copyright
19   *     notice, this list of conditions and the following disclaimer in the
20   *     documentation and/or other materials provided with the distribution.
21   * 
22   *   * Neither the name of the Jaxen Project nor the names of its
23   *     contributors may be used to endorse or promote products derived 
24   *     from this software without specific prior written permission.
25   * 
26   * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
27   * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED
28   * TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A
29   * PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER
30   * OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
31   * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
32   * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
33   * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
34   * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
35   * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
36   * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
37   *
38   * ====================================================================
39   * This software consists of voluntary contributions made by many 
40   * individuals on behalf of the Jaxen Project and was originally 
41   * created by bob mcwhirter <bob@werken.com> and 
42   * James Strachan <jstrachan@apache.org>.  For more information on the 
43   * Jaxen Project, please see <http://www.jaxen.org/>.
44   * 
45   * $Id$
46   */
47  
48  package org.jaxen.test;
49  
50  import java.util.Iterator;
51  import java.util.List;
52  
53  import javax.xml.parsers.DocumentBuilder;
54  import javax.xml.parsers.DocumentBuilderFactory;
55  import javax.xml.parsers.ParserConfigurationException;
56  
57  import junit.framework.TestCase;
58  
59  import org.jaxen.*;
60  import org.jaxen.dom.DOMXPath;
61  import org.jaxen.function.NumberFunction;
62  import org.jaxen.saxpath.SAXPathException;
63  import org.w3c.dom.Document;
64  
65  /***
66   * @author Elliotte Rusty Harold
67   *
68   */
69  public class ExtensionFunctionTest extends TestCase {
70  
71      private Document doc;
72      
73      public void setUp() throws ParserConfigurationException
74      {
75          DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
76          factory.setNamespaceAware(true);
77          DocumentBuilder builder = factory.newDocumentBuilder();
78          doc = builder.newDocument();
79      }
80  
81  
82      public ExtensionFunctionTest(String name) {
83          super(name);
84      }
85      
86      class MinFunction implements Function {
87  
88          public Object call(Context context, List args) {
89              
90              if (args.isEmpty()) return new Double(Double.NaN);
91              
92              Navigator navigator = context.getNavigator();
93              double min = Double.MAX_VALUE;
94              Iterator iterator = args.iterator();
95              while (iterator.hasNext()) {
96                  double next = NumberFunction.evaluate(iterator.next(), navigator).doubleValue();
97                  min = Math.min(min, next);
98              }
99              return new Double(min);
100         }
101         
102     }
103     
104     
105     public void testRegisterExtensionFunction() throws JaxenException {
106         
107         SimpleFunctionContext fc = new XPathFunctionContext(false);
108         fc.registerFunction("http://exslt.org/math", "min", new MinFunction());
109         
110         SimpleNamespaceContext nc = new SimpleNamespaceContext();
111         nc.addNamespace("math", "http://exslt.org/math");
112         
113         BaseXPath xpath = new DOMXPath("math:min(//x)");
114         
115         xpath.setFunctionContext(fc);
116         xpath.setNamespaceContext(nc);
117         
118         org.w3c.dom.Element a = doc.createElementNS("", "a");
119         org.w3c.dom.Element b = doc.createElementNS("", "b");
120         doc.appendChild(a);
121         a.appendChild(b);
122         org.w3c.dom.Element x2 = doc.createElementNS("", "x");
123         org.w3c.dom.Element x3 = doc.createElementNS("", "x");
124         org.w3c.dom.Element x4 = doc.createElementNS("", "x");
125         a.appendChild(x4);
126         b.appendChild(x2);
127         b.appendChild(x3);
128         x2.appendChild(doc.createTextNode("2"));
129         x3.appendChild(doc.createTextNode("3"));
130         x4.appendChild(doc.createTextNode("4"));
131         
132         Double result = (Double) xpath.evaluate(doc);
133         assertEquals(new Double(2), result);
134        
135         
136     }
137     
138     
139     public void testJaxen47() throws SAXPathException {
140        org.jaxen.dom.DocumentNavigator.getInstance().parseXPath("a:b()");
141     }
142     
143 }