01: /* Copyright (C) 2004 - 2007 db4objects Inc. http://www.db4o.com
02:
03: This file is part of the db4o open source object database.
04:
05: db4o is free software; you can redistribute it and/or modify it under
06: the terms of version 2 of the GNU General Public License as published
07: by the Free Software Foundation and as clarified by db4objects' GPL
08: interpretation policy, available at
09: http://www.db4o.com/about/company/legalpolicies/gplinterpretation/
10: Alternatively you can write to db4objects, Inc., 1900 S Norfolk Street,
11: Suite 350, San Mateo, CA 94403, USA.
12:
13: db4o is distributed in the hope that it will be useful, but WITHOUT ANY
14: WARRANTY; without even the implied warranty of MERCHANTABILITY or
15: FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
16: for more details.
17:
18: You should have received a copy of the GNU General Public License along
19: with this program; if not, write to the Free Software Foundation, Inc.,
20: 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. */
21: package EDU.purdue.cs.bloat.util;
22:
23: import java.util.*;
24:
25: /**
26: * IdentityComparator compares two objects using the result of
27: * System.identityHashCode.
28: */
29: public class IdentityComparator implements Comparator {
30: public int compare(final Object o1, final Object o2) {
31: final int n1 = System.identityHashCode(o1);
32: final int n2 = System.identityHashCode(o2);
33:
34: return n1 - n2;
35: /*
36: * if (n1 > n2) { return 1; }
37: *
38: * if (n1 < n2) { return -1; }
39: *
40: * return 0;
41: */
42: }
43: }
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