TObjectHashingStrategy


1   // Copyright (c) 2002, Eric D. Friedman All Rights Reserved.
2   
3   package gnu.trove;
4   
5   import java.io.Serializable  ;
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   {
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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