package it.cavallium.dbengine.lucene;

import it.unimi.dsi.fastutil.ints.IntHash;

public class IntSmear implements IntHash.Strategy {

	@Override
	public int hashCode(int e) {
		return smear(e);
	}

	/*
	 * This method was written by Doug Lea with assistance from members of JCP
	 * JSR-166 Expert Group and released to the public domain, as explained at
	 * http://creativecommons.org/licenses/publicdomain
	 *
	 * As of 2010/06/11, this method is identical to the (package private) hash
	 * method in OpenJDK 7's java.util.HashMap class.
	 */
	static int smear(int hashCode) {
		hashCode ^= (hashCode >>> 20) ^ (hashCode >>> 12);
		return hashCode ^ (hashCode >>> 7) ^ (hashCode >>> 4);
	}

	@Override
	public boolean equals(int a, int b) {
		return a == b;
	}
}