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Java > Open Source Codes > org > jgrapht > experimental > equivalence > UniformEquivalenceComparator


1 /* ==========================================
2  * JGraphT : a free Java graph-theory library
3  * ==========================================
4  *
5  * Project Info: http://jgrapht.sourceforge.net/
6  * Project Creator: Barak Naveh (http://sourceforge.net/users/barak_naveh)
7  *
8  * (C) Copyright 2003-2006, by Barak Naveh and Contributors.
9  *
10  * This library is free software; you can redistribute it and/or modify it
11  * under the terms of the GNU Lesser General Public License as published by
12  * the Free Software Foundation; either version 2.1 of the License, or
13  * (at your option) any later version.
14  *
15  * This library is distributed in the hope that it will be useful, but
16  * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
17  * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public
18  * License for more details.
19  *
20  * You should have received a copy of the GNU Lesser General Public License
21  * along with this library; if not, write to the Free Software Foundation,
22  * Inc.,
23  * 59 Temple Place, Suite 330, Boston, MA 02111-1307, USA.
24  */
25 /* -----------------
26  * UniformEquivalenceComparator.java
27  * -----------------
28  * (C) Copyright 2005-2006, by Assaf Lehr and Contributors.
29  *
30  * Original Author: Assaf Lehr
31  * Contributor(s): -
32  *
33  * $Id: UniformEquivalenceComparator.java 504 2006-07-03 02:37:26Z perfecthash $
34  *
35  * Changes
36  * -------
37  */
38 package org.jgrapht.experimental.equivalence;
39
40 /**
41  * This Equivalence comparator acts as if all elements are in one big global
42  * equivalence class. Useful when a comparator is needed, but there is no
43  * important difference between the elements. equivalenceCompare() always
44  * return true; equivalenceHashcode() always returns 0.
45  *
46  * @author Assaf
47  * @since Jul 21, 2005
48  */
49 public class UniformEquivalenceComparator<E, C>
50     implements EquivalenceComparator<E, C>
51 {
52
53     //~ Methods ---------------------------------------------------------------
54
55     /**
56      * Always returns true.
57      *
58      * @see EquivalenceComparator#equivalenceCompare(Object, Object, Object,
59      * Object)
60      */
61     public boolean equivalenceCompare(
62         E arg1,
63         E arg2,
64         C context1,
65         C context2)
66     {
67         return true;
68     }
69
70     /**
71      * Always returns 0.
72      *
73      * @see EquivalenceComparator#equivalenceHashcode(Object, Object)
74      */
75     public int equivalenceHashcode(E arg1, C context)
76     {
77         return 0;
78     }
79 }
80
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