    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 }