org.infinispan.commons.hash

Class MurmurHash2

java.lang.Object

org.infinispan.commons.hash.MurmurHash2

All Implemented Interfaces:

Hash

public class MurmurHash2
extends Object
implements Hash

An implementation of Austin Appleby's MurmurHash2.0 algorithm, as documented on his website.

This implementation is based on the slower, endian-neutral version of the algorithm as documented on the site, ported from Austin Appleby's original C++ version MurmurHashNeutral2.cpp.

Other implementations are documented on Wikipedia's MurmurHash page.

Version:

4.1

Author:

Manik Surtani

See Also:

MurmurHash website, MurmurHash entry on Wikipedia, MurmurHash2Compat

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	MurmurHash2.Externalizer

Constructor Summary

Constructors

Constructor and Description
MurmurHash2()

Method Summary

Methods

Modifier and Type	Method and Description
int	hash(byte[] payload) Hashes a byte array efficiently.
int	hash(int hashcode) An incremental version of the hash function, that spreads a pre-calculated hash code, such as one derived from Object.hashCode().
int	hash(Object o) A helper that calculates the hashcode of an object, choosing the optimal mechanism of hash calculation after considering the type of the object (byte array, String or Object).

Methods inherited from class java.lang.Object

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

Constructor Detail

MurmurHash2

public MurmurHash2()

Method Detail

hash

public final int hash(byte[] payload)

Description copied from interface: Hash

Hashes a byte array efficiently.

Specified by:

hash in interface Hash

Parameters:

payload - a byte array to hash

Returns:

a hash code for the byte array

hash

public final int hash(int hashcode)

Description copied from interface: Hash

An incremental version of the hash function, that spreads a pre-calculated hash code, such as one derived from Object.hashCode().

Specified by:

hash in interface Hash

Parameters:

hashcode - an object's hashcode

Returns:

a spread and hashed version of the hashcode

hash

public final int hash(Object o)

Description copied from interface: Hash

A helper that calculates the hashcode of an object, choosing the optimal mechanism of hash calculation after considering the type of the object (byte array, String or Object).

Specified by:

hash in interface Hash

Parameters:

o - object to hash

Returns:

a hashcode