Package com.linkedin.alpini.base.hash

Class JenkinsHashFunction

java.lang.Object

com.linkedin.alpini.base.hash.JenkinsHashFunction

All Implemented Interfaces:

HashFunction

public final class JenkinsHashFunction
extends java.lang.Object
implements HashFunction

Hash algorithm by Bob Jenkins, 1996. You may use this code any way you wish, private, educational, or commercial. It's free. See: http://burtleburtle.net/bob/hash/doobs.html Use for hash table lookup, or anything where one collision in 2^^32 is acceptable. Do NOT use for cryptographic purposes. Reimplementation from http://burtleburtle.net/bob/c/lookup3.c to match test vectors

Constructor Summary

Constructors

Constructor	Description
JenkinsHashFunction()

Method Summary

Modifier and Type	Method	Description
long	hash(byte[] key, int numBuckets)
long	hash(long key, int numBuckets)
long	hash(java.nio.ByteBuffer buf)
long	hash(java.nio.ByteBuffer buf, int off, int len)
int	hashlittle(java.nio.ByteBuffer k, int initval)
long	hashlittle2(java.nio.ByteBuffer k, long initval)
int	hashword(java.nio.IntBuffer k, int initval)
long	hashword2(java.nio.IntBuffer k, long initval)

Methods inherited from class java.lang.Object

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

Constructor Detail

JenkinsHashFunction

public JenkinsHashFunction()

Method Detail

hashword

public int hashword(java.nio.IntBuffer k,
                    int initval)

hashword2

public long hashword2(java.nio.IntBuffer k,
                      long initval)

hashlittle

public int hashlittle(java.nio.ByteBuffer k,
                      int initval)

hashlittle2

public long hashlittle2(java.nio.ByteBuffer k,
                        long initval)

hash

public long hash(java.nio.ByteBuffer buf)

Specified by:

hash in interface HashFunction

hash

public long hash(java.nio.ByteBuffer buf,
                 int off,
                 int len)

Specified by:

hash in interface HashFunction

hash

public long hash(byte[] key,
                 int numBuckets)

Specified by:

hash in interface HashFunction

hash

public long hash(long key,
                 int numBuckets)

Specified by:

hash in interface HashFunction