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Java > Open Source Codes > com > mchange > v2 > coalesce > CoalesceChecker


1 /*
2  * Distributed as part of c3p0 v.0.9.1
3  *
4  * Copyright (C) 2005 Machinery For Change, Inc.
5  *
6  * Author: Steve Waldman <swaldman@mchange.com>
7  *
8  * This library is free software; you can redistribute it and/or modify
9  * it under the terms of the GNU Lesser General Public License version 2.1, as
10  * published by the Free Software Foundation.
11  *
12  * This software is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15  * GNU Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public License
18  * along with this software; see the file LICENSE. If not, write to the
19  * Free Software Foundation, Inc., 59 Temple Place, Suite 330,
20  * Boston, MA 02111-1307, USA.
21  */
22
23
24 package com.mchange.v2.coalesce;
25
26 public interface CoalesceChecker
27 {
28     /**
29      * @return true iff a and b should be considered equivalent,
30      * so that a Coalescer should simply return whichever
31      * Object it considers canonical.
32      */
33     public boolean checkCoalesce( Object JavaDoc a, Object JavaDoc b );
34
35     /**
36      * Any two objects for which checkCoalese() would return true <b>must</b>
37      * coalesce hash to the same value!!!
38      */
39     public int coalesceHash( Object JavaDoc a );
40 }
41
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