01: // ============================================================================
02: // $Id: EqualEqual.java,v 1.13 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.comparison;
34:
35: /**
36: * Binary Predicate that returns TRUE for object arguments <b>x</b> and
37: * <b>y</b> when x == y using the built-in == operator.
38: * <p>
39: * Copyright © 2002-2005 David A. Hall
40: *
41: * @author <a href="mailto:davidahall@users.sourceforge.net">David A. Hall</a>
42: **/
43:
44: public class EqualEqual<T> extends Equality<T> {
45:
46: static final long serialVersionUID = -3103153568586667984L;
47:
48: // BinaryPredicate interface
49:
50: /**
51: * Given arguments <b>x</b> and <b>y</b>, returns x == y.
52: *
53: * @return x == y
54: */
55: public Boolean fn(T x, T y) {
56: return (x == y);
57: }
58:
59: /**
60: * Calls the Visitor's <code>visit(EqualEqual)</code> method, if it
61: * implements the nested Visitor interface.
62: */
63: public void accept(net.sf.jga.fn.Visitor v) {
64: if (v instanceof EqualEqual.Visitor)
65: ((EqualEqual.Visitor) v).visit(this );
66: else
67: v.visit(this );
68: }
69:
70: // Object overrides
71:
72: public String toString() {
73: return "EqualEqual";
74: }
75:
76: // Acyclic Visitor
77:
78: /**
79: * Interface for classes that may interpret an <b>EqualEqual</b> predicate.
80: */
81: public interface Visitor extends net.sf.jga.fn.Visitor {
82: public void visit(EqualEqual host);
83: }
84: }
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