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Java > Open Source Codes > net > sf > jga > fn > comparison > EqualEqual


1 // ============================================================================
2 // $Id: EqualEqual.java,v 1.13 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.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 &copy; 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 JavaDoc 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 JavaDoc 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 }
85
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