Coverage Report - org.jaxen.function.CountFunction

Classes in this File Line Coverage Branch Coverage Complexity
CountFunction
100% 
100% 
3

 1  
 /*
 2  
  * $Header: /home/projects/jaxen/scm/jaxen/src/java/main/org/jaxen/function/CountFunction.java,v 1.13 2005/06/28 13:44:45 elharo Exp $
 3  
  * $Revision: 1.13 $
 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: CountFunction.java,v 1.13 2005/06/28 13:44:45 elharo Exp $
 60  
  */
 61  
 
 62  
 package org.jaxen.function;
 63  
 
 64  
 import java.util.List;
 65  
 
 66  
 import org.jaxen.Context;
 67  
 import org.jaxen.Function;
 68  
 import org.jaxen.FunctionCallException;
 69  
 
 70  
 /**
 71  
  *  <p><b>4.1</b> <code><i>number</i> count(<i>node-set</i>)</code></p> 
 72  
  *  
 73  
  * <blockquote src="http://www.w3.org/TR/xpath#function-count">
 74  
  * The <b>count</b> function returns the number of nodes in the argument node-set.
 75  
  * </blockquote>
 76  
  * @author bob mcwhirter (bob @ werken.com)
 77  
  * @see <a href="http://www.w3.org/TR/xpath#function-count">Section 4.1 of the XPath Specification</a>
 78  
  */
 79  
 public class CountFunction implements Function
 80  
 {
 81  
 
 82  
     /**
 83  
      * Create a new <code>CountFunction</code> object.
 84  
      */
 85  294
     public CountFunction() {}
 86  
     
 87  
     /**
 88  
      * <p>
 89  
      * Returns the number of nodes in the specified node-set.
 90  
      * </p>
 91  
      * @param context ignored
 92  
      * @param args the function arguments
 93  
      * 
 94  
      * @return a <code>Double</code> giving the integral number of items in the first argument
 95  
      * 
 96  
      * @throws FunctionCallException if args does not have exactly one 
 97  
      *     item; or that item is not a <code>List</code>
 98  
      */
 99  
     public Object call(Context context,
 100  
                        List args) throws FunctionCallException
 101  
     {
 102  1608
         if (args.size() == 1)
 103  
         {
 104  1596
             return evaluate( args.get(0) );
 105  
         }
 106  
 
 107  12
         throw new FunctionCallException( "count() requires one argument." );
 108  
     }
 109  
 
 110  
     /**
 111  
      * <p>
 112  
      * Returns the number of nodes in the specified node-set.
 113  
      * </p>
 114  
      * 
 115  
      * @param obj a <code>List</code> of nodes
 116  
      * @return the integral number of items in the list
 117  
      * @throws FunctionCallException if obj is not a <code>List</code>
 118  
      */
 119  
     public static Double evaluate(Object obj) throws FunctionCallException
 120  
     {
 121  
       
 122  1596
         if (obj instanceof List)
 123  
         {
 124  1590
             return new Double( ((List) obj).size() );
 125  
         }
 126  
       
 127  6
         throw new FunctionCallException("count() function can only be used for node-sets");
 128  
         
 129  
     }
 130  
     
 131  
 }