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