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Java > Open Source Codes > net > sf > jga > fn > logical > LogicalNot


1 // ============================================================================
2 // $Id: LogicalNot.java,v 1.11 2006/01/08 00:52:25 davidahall Exp $
3 // Copyright (c) 2002-2005 David A. Hall
4 // ============================================================================
5 // The contents of this file are subject to the Common Development and
6 // Distribution License (CDDL), Version 1.0 (the License); you may not use this
7 // file except in compliance with the License. You should have received a copy
8 // of the the License along with this file: if not, a copy of the License is
9 // available from Sun Microsystems, Inc.
10 //
11 // http://www.sun.com/cddl/cddl.html
12 //
13 // From time to time, the license steward (initially Sun Microsystems, Inc.) may
14 // publish revised and/or new versions of the License. You may not use,
15 // distribute, or otherwise make this file available under subsequent versions
16 // of the License.
17 //
18 // Alternatively, the contents of this file may be used under the terms of the
19 // GNU Lesser General Public License Version 2.1 or later (the "LGPL"), in which
20 // case the provisions of the LGPL are applicable instead of those above. If you
21 // wish to allow use of your version of this file only under the terms of the
22 // LGPL, and not to allow others to use your version of this file under the
23 // terms of the CDDL, indicate your decision by deleting the provisions above
24 // and replace them with the notice and other provisions required by the LGPL.
25 // If you do not delete the provisions above, a recipient may use your version
26 // of this file under the terms of either the CDDL or the LGPL.
27 //
28 // This library is distributed in the hope that it will be useful,
29 // but WITHOUT ANY WARRANTY; without even the implied warranty of
30 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
31 // ============================================================================
32
33 package net.sf.jga.fn.logical;
34
35 import net.sf.jga.fn.UnaryPredicate;
36
37 /**
38  * Unary Predicate that returns true when Boolean argument <b>x</b> is false.
39  * <p>
40  * Copyright &copy; 2002-2005 David A. Hall
41  *
42  * @author <a HREF="mailto:davidahall@users.sourceforge.net">David A. Hall</a>
43  **/
44
45 public class LogicalNot extends UnaryPredicate<Boolean JavaDoc> {
46
47     static final long serialVersionUID = -3464871237361189509L;
48
49     // UnaryPredicate interface
50
51      /**
52      * Given Boolean argument <b>x</b>, returns true when x is false, false
53      * when x is true
54      *
55      * @return !x
56      */
57    public Boolean JavaDoc fn(Boolean JavaDoc x) {
58         return ! x;
59     }
60
61      /**
62      * Calls the Visitor's <code>visit(LogicalNot)</code> method, if it
63      * implements the nested Visitor interface.
64      */
65    public void accept(net.sf.jga.fn.Visitor v) {
66         if (v instanceof LogicalNot.Visitor)
67             ((LogicalNot.Visitor)v).visit(this);
68         else
69             v.visit(this);
70     }
71     
72     // Object overrides
73
74     public String JavaDoc toString() {
75         return "LogicalNot";
76     }
77     
78     // AcyclicVisitor
79
80     /**
81      * Interface for classes that may interpret a <b>LogicalNot</b>
82      * predicate.
83      */
84     public interface Visitor extends net.sf.jga.fn.Visitor {
85         public void visit(LogicalNot host);
86     }
87 }
88
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