01: // ============================================================================
02: // $Id: LogicalNot.java,v 1.11 2006/01/08 00:52:25 davidahall Exp $
03: // Copyright (c) 2002-2005 David A. Hall
04: // ============================================================================
05: // The contents of this file are subject to the Common Development and
06: // Distribution License (CDDL), Version 1.0 (the License); you may not use this
07: // file except in compliance with the License. You should have received a copy
08: // of the the License along with this file: if not, a copy of the License is
09: // 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 © 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> {
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 fn(Boolean 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 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: }
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