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Java > Open Source Codes > gnu > trove > TObjectHashingStrategy


1 // Copyright (c) 2002, Eric D. Friedman All Rights Reserved.
2

3 package gnu.trove;
4
5 import java.io.Serializable JavaDoc;
6
7 /**
8  * Interface to support pluggable hashing strategies in maps and sets.
9  * Implementors can use this interface to make the trove hashing
10  * algorithms use object values, values provided by the java runtime,
11  * or a custom strategy when computing hashcodes.
12  *
13  * Created: Sat Aug 17 10:52:32 2002
14  *
15  * @author Eric Friedman
16  * @version $Id: TObjectHashingStrategy.java,v 1.2 2006/11/10 23:27:56 robeden Exp $
17  */

18
19 public interface TObjectHashingStrategy<T> extends Serializable JavaDoc {
20
21   /**
22    * Computes a hash code for the specified object. Implementors
23    * can use the object's own <tt>hashCode</tt> method, the Java
24    * runtime's <tt>identityHashCode</tt>, or a custom scheme.
25    *
26    * @param object for which the hashcode is to be computed
27    * @return the hashCode
28    */

29   int computeHashCode(T object);
30
31   /**
32    * Compares o1 and o2 for equality. Strategy implementors may use
33    * the objects' own equals() methods, compare object references,
34    * or implement some custom scheme.
35    *
36    * @param o1 an <code>Object</code> value
37    * @param o2 an <code>Object</code> value
38    * @return true if the objects are equal according to this strategy.
39    */

40   boolean equals(T o1, T o2);
41 } // TObjectHashingStrategy
42
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