Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
NotFunction |
|
| 2.0;2 |
1 | /* | |
2 | * $Header: /home/projects/jaxen/scm/jaxen/src/java/main/org/jaxen/function/NotFunction.java,v 1.9 2006/02/05 21:47:41 elharo Exp $ | |
3 | * $Revision: 1.9 $ | |
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: NotFunction.java,v 1.9 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 | import org.jaxen.Navigator; | |
56 | ||
57 | /** | |
58 | * <p><b>4.3</b> <code><i>boolean</i> not(<i>boolean</i>)</code> </p> | |
59 | * | |
60 | * | |
61 | * <blockquote src="http://www.w3.org/TR/xpath#function-not"> | |
62 | * The <b>not</b> function returns true if its argument is false, and false otherwise. | |
63 | * </blockquote> | |
64 | * | |
65 | * @author bob mcwhirter (bob @ werken.com) | |
66 | * @see <a href="http://www.w3.org/TR/xpath#function-not" target="_top">Section 4.3 of the XPath Specification</a> | |
67 | */ | |
68 | public class NotFunction implements Function | |
69 | { | |
70 | ||
71 | /** | |
72 | * Create a new <code>NotFunction</code> object. | |
73 | */ | |
74 | 106 | public NotFunction() {} |
75 | ||
76 | /** | |
77 | * Returns <code>Boolean.TRUE</code> if the boolean value of | |
78 | * <code>args.get(0)</code> is false, and <code>Boolean.FALSE</code> otherwise. | |
79 | * The boolean value is calculated as if by the XPath <code>boolean</code> | |
80 | * function. | |
81 | * | |
82 | * @param context the context at the point in the | |
83 | * expression where the function is called | |
84 | * @param args a single element list | |
85 | * | |
86 | * @return <code>Boolean.TRUE</code> if the boolean value of | |
87 | * <code>obj</code> is false, and <code>Boolean.FALSE</code> otherwise | |
88 | * | |
89 | * @throws FunctionCallException if <code>args</code> does not have exactly one argument | |
90 | */ | |
91 | public Object call(Context context, | |
92 | List args) throws FunctionCallException | |
93 | { | |
94 | 14 | if (args.size() == 1) |
95 | { | |
96 | 10 | return evaluate( args.get(0), context.getNavigator() ); |
97 | } | |
98 | ||
99 | 4 | throw new FunctionCallException( "not() requires one argument." ); |
100 | } | |
101 | ||
102 | /** | |
103 | * Returns <code>Boolean.TRUE</code> if the boolean value of | |
104 | * <code>obj</code> is false, and <code>Boolean.FALSE</code> otherwise. | |
105 | * The boolean value is calculated as if by the XPath <code>boolean</code> | |
106 | * function. | |
107 | * | |
108 | * @param obj the object whose boolean value is inverted | |
109 | * @param nav the <code>Navigator</code> used to calculate the boolean value of <code>obj</code> | |
110 | * | |
111 | * @return <code>Boolean.TRUE</code> if the boolean value of | |
112 | * <code>obj</code> is false, and <code>Boolean.FALSE</code> otherwise | |
113 | */ | |
114 | public static Boolean evaluate(Object obj, Navigator nav) | |
115 | { | |
116 | 10 | return ( ( BooleanFunction.evaluate( obj, nav ).booleanValue() ) |
117 | ? Boolean.FALSE | |
118 | : Boolean.TRUE | |
119 | ); | |
120 | } | |
121 | ||
122 | } |