Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||||||
RoundFunction |
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1 | /* |
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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 $ |
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3 | * $Revision: 1.11 $ |
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4 | * $Date: 2005/06/28 13:44:45 $ |
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5 | * |
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6 | * ==================================================================== |
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7 | * |
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8 | * Copyright (C) 2000-2002 bob mcwhirter & James Strachan. |
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9 | * All rights reserved. |
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10 | * |
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11 | * Redistribution and use in source and binary forms, with or without |
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12 | * modification, are permitted provided that the following conditions |
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13 | * are met: |
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14 | * |
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15 | * 1. Redistributions of source code must retain the above copyright |
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16 | * notice, this list of conditions, and the following disclaimer. |
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17 | * |
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18 | * 2. Redistributions in binary form must reproduce the above copyright |
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19 | * notice, this list of conditions, and the disclaimer that follows |
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20 | * these conditions in the documentation and/or other materials |
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21 | * provided with the distribution. |
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22 | * |
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23 | * 3. The name "Jaxen" must not be used to endorse or promote products |
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24 | * derived from this software without prior written permission. For |
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25 | * written permission, please contact license@jaxen.org. |
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26 | * |
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27 | * 4. Products derived from this software may not be called "Jaxen", nor |
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28 | * may "Jaxen" appear in their name, without prior written permission |
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29 | * from the Jaxen Project Management (pm@jaxen.org). |
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30 | * |
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31 | * In addition, we request (but do not require) that you include in the |
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32 | * end-user documentation provided with the redistribution and/or in the |
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33 | * software itself an acknowledgement equivalent to the following: |
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34 | * "This product includes software developed by the |
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35 | * Jaxen Project <http://www.jaxen.org/>." |
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36 | * Alternatively, the acknowledgment may be graphical using the logos |
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37 | * available at http://www.jaxen.org/ |
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38 | * |
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39 | * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED |
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40 | * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES |
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41 | * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE |
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42 | * DISCLAIMED. IN NO EVENT SHALL THE Jaxen AUTHORS OR THE PROJECT |
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43 | * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
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44 | * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT |
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45 | * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF |
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46 | * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND |
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47 | * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, |
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48 | * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT |
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49 | * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF |
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50 | * SUCH DAMAGE. |
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51 | * |
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52 | * ==================================================================== |
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53 | * This software consists of voluntary contributions made by many |
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54 | * individuals on behalf of the Jaxen Project and was originally |
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55 | * created by bob mcwhirter <bob@werken.com> and |
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56 | * James Strachan <jstrachan@apache.org>. For more information on the |
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57 | * Jaxen Project, please see <http://www.jaxen.org/>. |
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58 | * |
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59 | * $Id: RoundFunction.java,v 1.11 2005/06/28 13:44:45 elharo Exp $ |
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60 | */ |
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61 | ||
62 | ||
63 | package org.jaxen.function; |
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64 | ||
65 | import java.util.List; |
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66 | ||
67 | import org.jaxen.Context; |
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68 | import org.jaxen.Function; |
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69 | import org.jaxen.FunctionCallException; |
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70 | import org.jaxen.Navigator; |
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71 | ||
72 | /** |
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73 | * <p><b>4.4</b> <code><i>number</i> round(<i>number</i>)</code> </p> |
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74 | * |
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75 | * |
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76 | * <blockquote src="http://www.w3.org/TR/xpath"> |
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77 | * The <b>round</b> function returns the number that is closest to the argument and that is an integer. |
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78 | * If there are two such numbers, then the one that is closest to positive infinity is returned. |
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79 | * If the argument is NaN, then NaN is returned. If the argument is positive infinity, then positive infinity is returned. |
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80 | * If the argument is negative infinity, then negative infinity is returned. |
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81 | * If the argument is positive zero, then positive zero is returned. |
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82 | * If the argument is negative zero, then negative zero is returned. |
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83 | * If the argument is less than zero, but greater than or equal to -0.5, then negative zero is returned. |
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84 | * </blockquote> |
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85 | * |
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86 | * @author bob mcwhirter (bob @ werken.com) |
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87 | * |
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88 | * @see <a href="http://www.w3.org/TR/xpath#function-round" target="_top">Section 4.4 of the XPath Specification</a> |
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89 | */ |
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90 | public class RoundFunction implements Function |
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91 | { |
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92 | ||
93 | /** |
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94 | * Create a new <code>RoundFunction</code> object. |
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95 | */ |
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96 | 294 | public RoundFunction() {} |
97 | ||
98 | ||
99 | /** Returns the nearest integer to the number. |
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100 | * |
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101 | * @param context the context at the point in the |
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102 | * expression when the function is called |
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103 | * @param args a list with exactly one item which will be converted to a |
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104 | * <code>Double</code> as if by the XPath <code>number()</code> function |
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105 | * |
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106 | * @return a <code>Double</code> containing the integer nearest to |
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107 | * <code>args.get(0)</code> |
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108 | * |
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109 | * @throws FunctionCallException if <code>args</code> has more or less than one item |
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110 | */ |
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111 | public Object call(Context context, |
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112 | List args) throws FunctionCallException |
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113 | { |
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114 | 30 | if (args.size() == 1) |
115 | { |
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116 | 18 | return evaluate( args.get(0), |
117 | context.getNavigator() ); |
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118 | } |
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119 | ||
120 | 12 | throw new FunctionCallException( "round() requires one argument." ); |
121 | } |
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122 | ||
123 | /** |
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124 | * Returns the integer nearest to the argument. |
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125 | * If necessary, the argument is first converted to a <code>Double</code> |
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126 | * as if by the XPath <code>number()</code> function. |
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127 | * |
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128 | * @param obj the object to be rounded |
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129 | * @param nav ignored |
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130 | * |
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131 | * @return the integer nearest to <code>obj</code> |
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132 | */ |
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133 | public static Double evaluate(Object obj, |
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134 | Navigator nav) |
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135 | { |
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136 | 474 | Double d = NumberFunction.evaluate( obj, |
137 | nav ); |
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138 | ||
139 | 474 | if (d.isNaN() || d.isInfinite()) |
140 | { |
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141 | 96 | return d; |
142 | } |
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143 | ||
144 | 378 | double value = d.doubleValue(); |
145 | 378 | return new Double( Math.round( value ) ); |
146 | } |
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147 | } |