Coverage Report - org.jaxen.function.NamespaceUriFunction

Classes in this File Line Coverage Branch Coverage Complexity
NamespaceUriFunction
96% 
100% 
9.333

 1  
 /*
 2  
  * $Header: /home/projects/jaxen/scm/jaxen/src/java/main/org/jaxen/function/NamespaceUriFunction.java,v 1.12 2005/06/28 13:44:45 elharo Exp $
 3  
  * $Revision: 1.12 $
 4  
  * $Date: 2005/06/28 13:44:45 $
 5  
  *
 6  
  * ====================================================================
 7  
  *
 8  
  * Copyright (C) 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
 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: NamespaceUriFunction.java,v 1.12 2005/06/28 13:44:45 elharo Exp $
 60  
  */
 61  
 
 62  
 
 63  
 package org.jaxen.function;
 64  
 
 65  
 import java.util.List;
 66  
 
 67  
 import org.jaxen.Context;
 68  
 import org.jaxen.Function;
 69  
 import org.jaxen.FunctionCallException;
 70  
 import org.jaxen.Navigator;
 71  
 
 72  
 /**
 73  
  * <p>
 74  
  * <b>4.1</b>
 75  
  * <code><i>string</i> namespace-uri(<i>node-set?</i>)</code>
 76  
  * </p>
 77  
  * 
 78  
  * <blockquote src="http://www.w3.org/TR/xpath">
 79  
  * <p>
 80  
  * The <b>namespace-uri</b>
 81  
  * function returns the namespace URI of the <a
 82  
  * href="http://www.w3.org/TR/xpath#dt-expanded-name" target="_top">expanded-name</a> of the node in the
 83  
  * argument node-set that is first in <a
 84  
  * href="http://www.w3.org/TR/xpath#dt-document-order" target="_top">document order</a>. If the argument
 85  
  * node-set is empty, the first node has no <a
 86  
  * href="http://www.w3.org/TR/xpath#dt-expanded-name" target="_top">expanded-name</a>, or the namespace URI of
 87  
  * the <a href="http://www.w3.org/TR/xpath#dt-expanded-name" target="_top">expanded-name</a> is null, an empty
 88  
  * string is returned. If the argument is omitted, it defaults to a
 89  
  * node-set with the context node as its only member.
 90  
  * </p>
 91  
  * 
 92  
  * <blockquote> <b>NOTE: </b>The string returned by the <b>namespace-uri</b> function will
 93  
  * be empty except for element nodes and attribute nodes.</blockquote>
 94  
  * 
 95  
  * </blockquote>
 96  
  * 
 97  
  * @author bob mcwhirter (bob @ werken.com)
 98  
  * @see <a href="http://www.w3.org/TR/xpath#function-namespace-uri"
 99  
  *      target="_top">Section 4.1 of the XPath Specification</a>
 100  
  */
 101  
 public class NamespaceUriFunction implements Function
 102  
 {
 103  
 
 104  
     /**
 105  
      * Create a new <code>NamespaceUriFunction</code> object.
 106  
      */
 107  294
     public NamespaceUriFunction() {}
 108  
 
 109  
     /**
 110  
      * Returns the namespace URI of the specified node or the namespace URI of the context node if 
 111  
      * no arguments are provided.
 112  
      * 
 113  
      * @param context the context at the point in the
 114  
      *         expression where the function is called
 115  
      * @param args a <code>List</code> containing zero or one items
 116  
      * 
 117  
      * @return a <code>String</code> containing the namespace URI
 118  
      * 
 119  
      * @throws FunctionCallException if <code>args</code> has more than one item
 120  
      */
 121  
     public Object call(Context context,
 122  
                        List args) throws FunctionCallException
 123  
     {
 124  276
         if (args.size() == 0)
 125  
         {
 126  222
             return evaluate( context.getNodeSet(),
 127  
                              context.getNavigator() );
 128  
         }
 129  
 
 130  54
         if ( args.size() == 1 )
 131  
         {
 132  48
             return evaluate( args,
 133  
                              context.getNavigator() );
 134  
         }
 135  
 
 136  6
         throw new FunctionCallException( "namespace-uri() requires zero or one argument." );
 137  
     }
 138  
 
 139  
     /**
 140  
      * Returns the namespace URI of <code>list.get(0)</code>
 141  
      * 
 142  
      * @param list a list of nodes
 143  
      * @param nav the <code>Navigator</code> used to retrieve the namespace
 144  
      * 
 145  
      * @return the namespace URI of <code>list.get(0)</code>
 146  
      * 
 147  
      * @throws FunctionCallException if <code>list.get(0)</code> is not a node
 148  
      */
 149  
     public static String evaluate(List list,
 150  
                                   Navigator nav) throws FunctionCallException
 151  
     {
 152  312
         if ( ! list.isEmpty() )
 153  
         {
 154  300
             Object first = list.get(0);
 155  
 
 156  300
             if ( first instanceof List )
 157  
             {
 158  42
                 return evaluate( (List) first,
 159  
                                  nav );
 160  
             }
 161  258
             else if ( nav.isElement( first ) )
 162  
             {
 163  216
                 return nav.getElementNamespaceUri( first );
 164  
             }
 165  42
             else if ( nav.isAttribute( first ) )
 166  
             {
 167  12
                 String uri = nav.getAttributeNamespaceUri( first );
 168  12
                 if (uri == null) return "";
 169  6
                 return uri;
 170  
             }
 171  30
             else if ( nav.isProcessingInstruction( first ) )
 172  
             {
 173  6
                 return "";
 174  
             }
 175  24
             else if ( nav.isNamespace( first ) )
 176  
             {
 177  6
                 return "";
 178  
             }
 179  18
             else if ( nav.isDocument( first ) )
 180  
             {
 181  6
                 return "";
 182  
             }
 183  12
             else if ( nav.isComment( first ) )
 184  
             {
 185  0
                 return "";
 186  
             }
 187  12
             else if ( nav.isText( first ) )
 188  
             {
 189  6
                 return "";
 190  
             }
 191  
             else {
 192  6
                 throw new FunctionCallException(
 193  
                   "The argument to the namespace-uri function must be a node-set");   
 194  
             }
 195  
 
 196  
         }
 197  
 
 198  12
         return "";
 199  
 
 200  
     }
 201  
 }
 202