##### Coverage Report - org.jaxen.function.RoundFunction

Classes in this File | Line Coverage | Branch Coverage | Complexity
RoundFunction |
100% |
100% |
| 2.6666666666666665;2.667

1 |  |
     /*
2 |  |
      * $Header: /home/projects/jaxen/scm/jaxen/src/java/main/org/jaxen/function/RoundFunction.java,v 1.11 2005/06/28 13:44:45 elharo Exp $
3 |  |
      * $Revision: 1.11 $
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: RoundFunction.java,v 1.11 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><b>4.4</b> <code><i>number</i> round(<i>number</i>)</code> </p>
74 |  |
      *
75 |  |
      *
76 |  |
      * <blockquote src="http://www.w3.org/TR/xpath">
77 |  |
      * The <b>round</b> function returns the number that is closest to the argument and that is an integer.
78 |  |
      * If there are two such numbers, then the one that is closest to positive infinity is returned.
79 |  |
      * If the argument is NaN, then NaN is returned. If the argument is positive infinity, then positive infinity is returned.
80 |  |
      * If the argument is negative infinity, then negative infinity is returned.
81 |  |
      * If the argument is positive zero, then positive zero is returned.
82 |  |
      * If the argument is negative zero, then negative zero is returned.
83 |  |
      * If the argument is less than zero, but greater than or equal to -0.5, then negative zero is returned.
84 |  |
      * </blockquote>
85 |  |
      *
86 |  |
      * @author bob mcwhirter (bob @ werken.com)
87 |  |
      *
88 |  |
      * @see <a href="http://www.w3.org/TR/xpath#function-round" target="_top">Section 4.4 of the XPath Specification</a>
89 |  |
      */
90 |  |
     public class RoundFunction implements Function
91 |  |
     {
92 |  |
93 |  |
         /**
94 |  |
          * Create a new <code>RoundFunction</code> object.
95 |  |
          */
96 | 294 |
         public RoundFunction() {}
97 |  |
98 |  |
99 |  |
         /** Returns the nearest integer to the number.
100 |  |
          *
101 |  |
          * @param context the context at the point in the
102 |  |
          *         expression when the function is called
103 |  |
          * @param args a list with exactly one item which will be converted to a
104 |  |
          *     <code>Double</code> as if by the XPath <code>number()</code> function
105 |  |
          *
106 |  |
          * @return a <code>Double</code> containing the integer nearest to
107 |  |
          *     <code>args.get(0)</code>
108 |  |
          *
109 |  |
          * @throws FunctionCallException if <code>args</code> has more or less than one item
110 |  |
          */
111 |  |
         public Object call(Context context,
112 |  |
                            List args) throws FunctionCallException
113 |  |
         {
114 | 30 |
             if (args.size() == 1)
115 |  |
             {
116 | 18 |
                 return evaluate( args.get(0),
117 |  |
                                  context.getNavigator() );
118 |  |
             }
119 |  |
120 | 12 |
             throw new FunctionCallException( "round() requires one argument." );
121 |  |
         }
122 |  |
123 |  |
         /**
124 |  |
          * Returns the integer nearest to the argument.
125 |  |
          * If necessary, the argument is first converted to a <code>Double</code>
126 |  |
          * as if by the XPath <code>number()</code> function.
127 |  |
          *
128 |  |
          * @param obj the object to be rounded
129 |  |
          * @param nav ignored
130 |  |
          *
131 |  |
          * @return the integer nearest to <code>obj</code>
132 |  |
          */
133 |  |
         public static Double evaluate(Object obj,
134 |  |
                                       Navigator nav)
135 |  |
         {
136 | 474 |
             Double d  = NumberFunction.evaluate( obj,
137 |  |
                                                 nav );
138 |  |
139 | 474 |
             if (d.isNaN() || d.isInfinite())
140 |  |
             {
141 | 96 |
                 return d;
142 |  |
             }
143 |  |
144 | 378 |
             double value = d.doubleValue();
145 | 378 |
             return new Double( Math.round( value ) );
146 |  |
         }
147 |  |
     }