com.netflix.nfgraph.util.Mixer Maven / Gradle / Ivy

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/*
 *  Copyright 2013 Netflix, Inc.
 *
 *     Licensed under the Apache License, Version 2.0 (the "License");
 *     you may not use this file except in compliance with the License.
 *     You may obtain a copy of the License at
 *
 *         http://www.apache.org/licenses/LICENSE-2.0
 *
 *     Unless required by applicable law or agreed to in writing, software
 *     distributed under the License is distributed on an "AS IS" BASIS,
 *     WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *     See the License for the specific language governing permissions and
 *     limitations under the License.
 *
 */

package com.netflix.nfgraph.util;

public class Mixer {

    /**
     * Thomas Wang's commonly used 32 bit mix function. 
     */
	public static int hashInt(int key) {
		key = ~key + (key << 15);
		key = key ^ (key >>> 12);
		key = key + (key << 2);
		key = key ^ (key >>> 4);
		key = key * 2057;
		key = key ^ (key >>> 16);
		return key & Integer.MAX_VALUE;
	}

}