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Java > Open Source Codes > bak > pcj > hash > DefaultBooleanHashFunction


1 /*
2  * Primitive Collections for Java.
3  * Copyright (C) 2002, 2003 Søren Bak
4  *
5  * This library is free software; you can redistribute it and/or
6  * modify it under the terms of the GNU Lesser General Public
7  * License as published by the Free Software Foundation; either
8  * version 2.1 of the License, or (at your option) any later version.
9  *
10  * This library is distributed in the hope that it will be useful,
11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
13  * Lesser General Public License for more details.
14  *
15  * You should have received a copy of the GNU Lesser General Public
16  * License along with this library; if not, write to the Free Software
17  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18  */
19 package bak.pcj.hash;
20
21 import java.lang.Boolean JavaDoc; // workaround to produce link in @see
22 import java.io.Serializable JavaDoc;
23
24 /**
25  * This class provides a default hash function for
26  * boolean values. It has been derived from the Java library and
27  * is known to work well in the general case.
28  *
29  * @see Boolean#hashCode()
30  * @serial exclude
31  * @author Søren Bak
32  * @version 1.2 2003/5/3
33  * @since 1.0
34  */
35 public class DefaultBooleanHashFunction implements BooleanHashFunction, Serializable JavaDoc {
36
37     /** Default instance of this hash function. */
38     public static final BooleanHashFunction INSTANCE = new DefaultBooleanHashFunction();
39
40     /** Default constructor to be invoked by sub-classes. */
41     protected DefaultBooleanHashFunction() { }
42
43     public int hash(boolean v) {
44         return v ? 1231 : 1237;
45     }
46
47 }
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