com.mwt.utilities

Class MurMurHash3

java.lang.Object

com.mwt.utilities.MurMurHash3

public final class MurMurHash3
extends Object

This produces exactly the same hash values as the final C+ version of MurmurHash3 and is thus suitable for producing the same hash values across platforms.

The 32 bit x86 version of this hash should be the fastest variant for relatively short keys like ids.

Note - The x86 and x64 versions do _not_ produce the same results, as the algorithms are optimized for their respective platforms.

See also http://github.com/yonik/java_util for future updates to this file.

Method Summary

Modifier and Type	Method and Description
static long	computeIdHash(String s)
static long	murmurhash3x8632(byte[] data, int offset, int len, int seed) Returns the MurmurHash3_x86_32 hash.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

computeIdHash

public static long computeIdHash(String s)

murmurhash3x8632

public static long murmurhash3x8632(byte[] data,
                                    int offset,
                                    int len,
                                    int seed)

Returns the MurmurHash3_x86_32 hash.

Parameters:

data - the data to hash

offset - the offset to use with the hash

len - the length of the resultant hash (controls the size)

seed - the seed to use

Returns:

the hashed value