Coverage Report - org.jaxen.function.NamespaceUriFunction
 
Classes in this File Line Coverage Branch Coverage Complexity
NamespaceUriFunction
100%
28/28
100%
12/12
9.333
 
 1  
 /*
 2  
  * $Header: /home/projects/jaxen/scm/jaxen/src/java/main/org/jaxen/function/NamespaceUriFunction.java,v 1.13 2006/02/05 21:47:41 elharo Exp $
 3  
  * $Revision: 1.13 $
 4  
  * $Date: 2006/02/05 21:47:41 $
 5  
  *
 6  
  * ====================================================================
 7  
  *
 8  
  * Copyright 2000-2002 bob mcwhirter & James Strachan.
 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: NamespaceUriFunction.java,v 1.13 2006/02/05 21:47:41 elharo Exp $
 46  
  */
 47  
 
 48  
 
 49  
 package org.jaxen.function;
 50  
 
 51  
 import java.util.List;
 52  
 
 53  
 import org.jaxen.Context;
 54  
 import org.jaxen.Function;
 55  
 import org.jaxen.FunctionCallException;
 56  
 import org.jaxen.Navigator;
 57  
 
 58  
 /**
 59  
  * <p>
 60  
  * <b>4.1</b>
 61  
  * <code><i>string</i> namespace-uri(<i>node-set?</i>)</code>
 62  
  * </p>
 63  
  * 
 64  
  * <blockquote src="http://www.w3.org/TR/xpath">
 65  
  * <p>
 66  
  * The <b>namespace-uri</b>
 67  
  * function returns the namespace URI of the <a
 68  
  * href="http://www.w3.org/TR/xpath#dt-expanded-name" target="_top">expanded-name</a> of the node in the
 69  
  * argument node-set that is first in <a
 70  
  * href="http://www.w3.org/TR/xpath#dt-document-order" target="_top">document order</a>. If the argument
 71  
  * node-set is empty, the first node has no <a
 72  
  * href="http://www.w3.org/TR/xpath#dt-expanded-name" target="_top">expanded-name</a>, or the namespace URI of
 73  
  * the <a href="http://www.w3.org/TR/xpath#dt-expanded-name" target="_top">expanded-name</a> is null, an empty
 74  
  * string is returned. If the argument is omitted, it defaults to a
 75  
  * node-set with the context node as its only member.
 76  
  * </p>
 77  
  * 
 78  
  * <blockquote> <b>NOTE: </b>The string returned by the <b>namespace-uri</b> function will
 79  
  * be empty except for element nodes and attribute nodes.</blockquote>
 80  
  * 
 81  
  * </blockquote>
 82  
  * 
 83  
  * @author bob mcwhirter (bob @ werken.com)
 84  
  * @see <a href="http://www.w3.org/TR/xpath#function-namespace-uri"
 85  
  *      target="_top">Section 4.1 of the XPath Specification</a>
 86  
  */
 87  
 public class NamespaceUriFunction implements Function
 88  
 {
 89  
 
 90  
     /**
 91  
      * Create a new <code>NamespaceUriFunction</code> object.
 92  
      */
 93  106
     public NamespaceUriFunction() {}
 94  
 
 95  
     /**
 96  
      * Returns the namespace URI of the specified node or the namespace URI of the context node if 
 97  
      * no arguments are provided.
 98  
      * 
 99  
      * @param context the context at the point in the
 100  
      *         expression where the function is called
 101  
      * @param args a <code>List</code> containing zero or one items
 102  
      * 
 103  
      * @return a <code>String</code> containing the namespace URI
 104  
      * 
 105  
      * @throws FunctionCallException if <code>args</code> has more than one item
 106  
      */
 107  
     public Object call(Context context,
 108  
                        List args) throws FunctionCallException
 109  
     {
 110  92
         if (args.size() == 0)
 111  
         {
 112  74
             return evaluate( context.getNodeSet(),
 113  
                              context.getNavigator() );
 114  
         }
 115  
 
 116  18
         if ( args.size() == 1 )
 117  
         {
 118  16
             return evaluate( args,
 119  
                              context.getNavigator() );
 120  
         }
 121  
 
 122  2
         throw new FunctionCallException( "namespace-uri() requires zero or one argument." );
 123  
     }
 124  
 
 125  
     /**
 126  
      * Returns the namespace URI of <code>list.get(0)</code>
 127  
      * 
 128  
      * @param list a list of nodes
 129  
      * @param nav the <code>Navigator</code> used to retrieve the namespace
 130  
      * 
 131  
      * @return the namespace URI of <code>list.get(0)</code>
 132  
      * 
 133  
      * @throws FunctionCallException if <code>list.get(0)</code> is not a node
 134  
      */
 135  
     public static String evaluate(List list,
 136  
                                   Navigator nav) throws FunctionCallException
 137  
     {
 138  104
         if ( ! list.isEmpty() )
 139  
         {
 140  102
             Object first = list.get(0);
 141  
 
 142  102
             if ( first instanceof List )
 143  
             {
 144  14
                 return evaluate( (List) first,
 145  
                                  nav );
 146  
             }
 147  88
             else if ( nav.isElement( first ) )
 148  
             {
 149  72
                 return nav.getElementNamespaceUri( first );
 150  
             }
 151  16
             else if ( nav.isAttribute( first ) )
 152  
             {
 153  4
                 String uri = nav.getAttributeNamespaceUri( first );
 154  4
                 if (uri == null) return "";
 155  2
                 return uri;
 156  
             }
 157  12
             else if ( nav.isProcessingInstruction( first ) )
 158  
             {
 159  2
                 return "";
 160  
             }
 161  10
             else if ( nav.isNamespace( first ) )
 162  
             {
 163  2
                 return "";
 164  
             }
 165  8
             else if ( nav.isDocument( first ) )
 166  
             {
 167  2
                 return "";
 168  
             }
 169  6
             else if ( nav.isComment( first ) )
 170  
             {
 171  2
                 return "";
 172  
             }
 173  4
             else if ( nav.isText( first ) )
 174  
             {
 175  2
                 return "";
 176  
             }
 177  
             else {
 178  2
                 throw new FunctionCallException(
 179  
                   "The argument to the namespace-uri function must be a node-set");   
 180  
             }
 181  
 
 182  
         }
 183  
 
 184  2
         return "";
 185  
 
 186  
     }
 187  
 }
 188