Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
RoundFunction |
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1 | /* | |
2 | * $Header: /home/projects/jaxen/scm/jaxen/src/java/main/org/jaxen/function/RoundFunction.java,v 1.12 2006/02/05 21:47:41 elharo Exp $ | |
3 | * $Revision: 1.12 $ | |
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: RoundFunction.java,v 1.12 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><b>4.4</b> <code><i>number</i> round(<i>number</i>)</code> </p> | |
60 | * | |
61 | * | |
62 | * <blockquote src="http://www.w3.org/TR/xpath"> | |
63 | * The <b>round</b> function returns the number that is closest to the argument and that is an integer. | |
64 | * If there are two such numbers, then the one that is closest to positive infinity is returned. | |
65 | * If the argument is NaN, then NaN is returned. If the argument is positive infinity, then positive infinity is returned. | |
66 | * If the argument is negative infinity, then negative infinity is returned. | |
67 | * If the argument is positive zero, then positive zero is returned. | |
68 | * If the argument is negative zero, then negative zero is returned. | |
69 | * If the argument is less than zero, but greater than or equal to -0.5, then negative zero is returned. | |
70 | * </blockquote> | |
71 | * | |
72 | * @author bob mcwhirter (bob @ werken.com) | |
73 | * | |
74 | * @see <a href="http://www.w3.org/TR/xpath#function-round" target="_top">Section 4.4 of the XPath Specification</a> | |
75 | */ | |
76 | public class RoundFunction implements Function | |
77 | { | |
78 | ||
79 | /** | |
80 | * Create a new <code>RoundFunction</code> object. | |
81 | */ | |
82 | 106 | public RoundFunction() {} |
83 | ||
84 | ||
85 | /** Returns the nearest integer to the number. | |
86 | * | |
87 | * @param context the context at the point in the | |
88 | * expression when the function is called | |
89 | * @param args a list with exactly one item which will be converted to a | |
90 | * <code>Double</code> as if by the XPath <code>number()</code> function | |
91 | * | |
92 | * @return a <code>Double</code> containing the integer nearest to | |
93 | * <code>args.get(0)</code> | |
94 | * | |
95 | * @throws FunctionCallException if <code>args</code> has more or less than one item | |
96 | */ | |
97 | public Object call(Context context, | |
98 | List args) throws FunctionCallException | |
99 | { | |
100 | 10 | if (args.size() == 1) |
101 | { | |
102 | 6 | return evaluate( args.get(0), |
103 | context.getNavigator() ); | |
104 | } | |
105 | ||
106 | 4 | throw new FunctionCallException( "round() requires one argument." ); |
107 | } | |
108 | ||
109 | /** | |
110 | * Returns the integer nearest to the argument. | |
111 | * If necessary, the argument is first converted to a <code>Double</code> | |
112 | * as if by the XPath <code>number()</code> function. | |
113 | * | |
114 | * @param obj the object to be rounded | |
115 | * @param nav ignored | |
116 | * | |
117 | * @return the integer nearest to <code>obj</code> | |
118 | */ | |
119 | public static Double evaluate(Object obj, | |
120 | Navigator nav) | |
121 | { | |
122 | 158 | Double d = NumberFunction.evaluate( obj, |
123 | nav ); | |
124 | ||
125 | 158 | if (d.isNaN() || d.isInfinite()) |
126 | { | |
127 | 32 | return d; |
128 | } | |
129 | ||
130 | 126 | double value = d.doubleValue(); |
131 | 126 | return new Double( Math.round( value ) ); |
132 | } | |
133 | } |