https://github.com/eclipse/eclipse-collections/eclipse-collections-api: Eclipse Collections is a collections framework for Java. It has JDK-compatible List, Set and Map implementations with a rich API and set of utility classes that work with any JDK compatible Collections, Arrays, Maps or Strings. The iteration protocol was inspired by the Smalltalk collection framework.
  • Craig P. Motlin
  • Donald Raab
  • Mohammad A. Rezaei
  • Hiroshi Ito
  • Nikhil J. Nanivadekar 
/*
 * Copyright (c) 2015 Goldman Sachs.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * and Eclipse Distribution License v. 1.0 which accompany this distribution.
 * The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
 * and the Eclipse Distribution License is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 */

package org.eclipse.collections.api.block;

import java.io.Serializable;


Interface for supporting user defined hashing strategies in Sets and Maps

/**
 * Interface for supporting user defined hashing strategies in Sets and Maps
 */
public interface HashingStrategy<E>
        extends Serializable
{
    
Computes the hashCode of the object as defined by the user.

/**
     * Computes the hashCode of the object as defined by the user.
     */
    int computeHashCode(E object);

    
Checks two objects for equality. The equality check can use the objects own equals() method or
a custom method defined by the user. It should be consistent with the computeHashCode() method.

/**
     * Checks two objects for equality. The equality check can use the objects own equals() method or
     * a custom method defined by the user. It should be consistent with the computeHashCode() method.
     */
    boolean equals(E object1, E object2);
}