/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to You 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 org.apache.mahout.math.set;
/**
* Computes hashes of primitive values. Providing these as statics allows the templated code
* to compute hashes of sets.
*/
public final class HashUtils {
private HashUtils() {
}
public static int hash(byte x) {
return x;
}
public static int hash(short x) {
return x;
}
public static int hash(char x) {
return x;
}
public static int hash(int x) {
return x;
}
public static int hash(float x) {
return Float.floatToIntBits(x) >>> 3 + Float.floatToIntBits((float) (Math.PI * x));
}
public static int hash(double x) {
return hash(17 * Double.doubleToLongBits(x));
}
public static int hash(long x) {
return (int) ((x * 11) >>> 32 ^ x);
}
}