OddEvenGroupComparator


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   * OddEvenGroupComparator.java
27   * -----------------
28   * (C) Copyright 2005-2006, by Barak Naveh and Contributors.
29   *
30   * Original Author:  Assaf Lehr
31   * Contributor(s):   -
32   *
33   * $Id: OddEvenGroupComparator.java 504 2006-07-03 02:37:26Z perfecthash $
34   *
35   * Changes
36   * -------
37   */
38  package org.jgrapht.experimental.isomorphism.comparators;
39  
40  import org.jgrapht.experimental.equivalence.*;
41  
42  
43  /**
44   * Comparator which defines two groups of integers. Odds (mod2=1) and
45   * Evens(mod2=0). Works only on Integers.
46   *
47   * @author Assaf
48   * @since Jul 22, 2005
49   */
50  public class OddEvenGroupComparator
51      implements EquivalenceComparator<Integer  , Object  >
52  {
53  
54      //~ Methods ---------------------------------------------------------------
55  
56      public boolean equivalenceCompare(
57          Integer   arg1,
58          Integer   arg2,
59          Object   context1,
60          Object   context2)
61      {
62          int int1 = arg1.intValue();
63          int int2 = arg2.intValue();
64  
65          boolean result = ((int1 % 2) == (int2 % 2));
66          return result;
67      }
68  
69      /* Odd and even must have unique values.
70       * @see
71       *
72       *
73       *
74       *
75       *
76       * org.jgrapht.experimental.equivalence.EquivalenceComparator#equivalenceHashcode(java.lang.Object)
77       */
78      public int equivalenceHashcode(Integer   arg1, Object   context)
79      {
80          int int1 = arg1.intValue();
81          return int1 % 2;
82      }
83  }
84
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