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Java > Open Source Codes > soot > EquivTo


1 /* Soot - a J*va Optimization Framework
2  * Copyright (C) 1997-1999 Raja Vallee-Rai
3  *
4  * This library is free software; you can redistribute it and/or
5  * modify it under the terms of the GNU Lesser General Public
6  * License as published by the Free Software Foundation; either
7  * version 2.1 of the License, or (at your option) any later version.
8  *
9  * This library is distributed in the hope that it will be useful,
10  * but WITHOUT ANY WARRANTY; without even the implied warranty of
11  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
12  * Lesser General Public License for more details.
13  *
14  * You should have received a copy of the GNU Lesser General Public
15  * License along with this library; if not, write to the
16  * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
17  * Boston, MA 02111-1307, USA.
18  */

19
20 /*
21  * Modified by the Sable Research Group and others 1997-1999.
22  * See the 'credits' file distributed with Soot for the complete list of
23  * contributors. (Soot is distributed at http://www.sable.mcgill.ca/soot)
24  */

25
26
27 package soot;
28
29 import soot.util.*;
30 import java.util.*;
31 import soot.*;
32
33 /** An alternate equivalence relation
34  * between objects. The standard interpretation will be structural
35  * equality. We also demand that if x.equivTo(y), then x.equivHashCode() ==
36  * y.equivHashCode. */

37 public interface EquivTo
38 {
39     /** Returns true if this object is equivalent to o. */
40     public boolean equivTo(Object JavaDoc o);
41
42     /** Returns a (not necessarily fixed) hash code for this object.
43      * This hash code coincides with equivTo; it is undefined in the
44      * presence of mutable objects. */

45     public int equivHashCode();
46 }
47
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