Coverage Report - org.jaxen.function.CountFunction
 
Classes in this File Line Coverage Branch Coverage Complexity
CountFunction
100%
7/7
100%
2/2
3
 
 1  
 /*
 2  
  * $Header: /home/projects/jaxen/scm/jaxen/src/java/main/org/jaxen/function/CountFunction.java,v 1.14 2006/02/05 21:47:41 elharo Exp $
 3  
  * $Revision: 1.14 $
 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: CountFunction.java,v 1.14 2006/02/05 21:47:41 elharo Exp $
 46  
  */
 47  
 
 48  
 package org.jaxen.function;
 49  
 
 50  
 import java.util.List;
 51  
 
 52  
 import org.jaxen.Context;
 53  
 import org.jaxen.Function;
 54  
 import org.jaxen.FunctionCallException;
 55  
 
 56  
 /**
 57  
  *  <p><b>4.1</b> <code><i>number</i> count(<i>node-set</i>)</code></p> 
 58  
  *  
 59  
  * <blockquote src="http://www.w3.org/TR/xpath#function-count">
 60  
  * The <b>count</b> function returns the number of nodes in the argument node-set.
 61  
  * </blockquote>
 62  
  * @author bob mcwhirter (bob @ werken.com)
 63  
  * @see <a href="http://www.w3.org/TR/xpath#function-count">Section 4.1 of the XPath Specification</a>
 64  
  */
 65  
 public class CountFunction implements Function
 66  
 {
 67  
 
 68  
     /**
 69  
      * Create a new <code>CountFunction</code> object.
 70  
      */
 71  106
     public CountFunction() {}
 72  
     
 73  
     /**
 74  
      * <p>
 75  
      * Returns the number of nodes in the specified node-set.
 76  
      * </p>
 77  
      * @param context ignored
 78  
      * @param args the function arguments
 79  
      * 
 80  
      * @return a <code>Double</code> giving the integral number of items in the first argument
 81  
      * 
 82  
      * @throws FunctionCallException if args does not have exactly one 
 83  
      *     item; or that item is not a <code>List</code>
 84  
      */
 85  
     public Object call(Context context,
 86  
                        List args) throws FunctionCallException
 87  
     {
 88  536
         if (args.size() == 1)
 89  
         {
 90  532
             return evaluate( args.get(0) );
 91  
         }
 92  
 
 93  4
         throw new FunctionCallException( "count() requires one argument." );
 94  
     }
 95  
 
 96  
     /**
 97  
      * <p>
 98  
      * Returns the number of nodes in the specified node-set.
 99  
      * </p>
 100  
      * 
 101  
      * @param obj a <code>List</code> of nodes
 102  
      * @return the integral number of items in the list
 103  
      * @throws FunctionCallException if obj is not a <code>List</code>
 104  
      */
 105  
     public static Double evaluate(Object obj) throws FunctionCallException
 106  
     {
 107  
       
 108  532
         if (obj instanceof List)
 109  
         {
 110  530
             return new Double( ((List) obj).size() );
 111  
         }
 112  
       
 113  2
         throw new FunctionCallException("count() function can only be used for node-sets");
 114  
         
 115  
     }
 116  
     
 117  
 }