| /* |
| * Copyright (c) 2012, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| package sun.misc; |
| |
| import java.util.concurrent.ThreadLocalRandom; |
| |
| /** |
| * Hashing utilities. |
| * |
| * Little endian implementations of Murmur3 hashing. |
| */ |
| public class Hashing { |
| |
| /** |
| * Static utility methods only. |
| */ |
| private Hashing() { |
| throw new Error("No instances"); |
| } |
| |
| // Spread bits to regularize both segment and index locations, |
| // using variant of single-word Wang/Jenkins hash. |
| // |
| // Based on commit 1424a2a1a9fc53dc8b859a77c02c924. |
| public static int singleWordWangJenkinsHash(Object k) { |
| int h = k.hashCode(); |
| |
| h += (h << 15) ^ 0xffffcd7d; |
| h ^= (h >>> 10); |
| h += (h << 3); |
| h ^= (h >>> 6); |
| h += (h << 2) + (h << 14); |
| return h ^ (h >>> 16); |
| } |
| } |