Package com.arcadedb.engine

Class MurmurHash

java.lang.Object

com.arcadedb.engine.MurmurHash

public final class MurmurHash
extends Object

Murmur hash 2.0.
The murmur hash is a relative fast hash function from http://murmurhash.googlepages.com/ for platforms with efficient multiplication.
This is a re-implementation of the original C code plus some additional features.
Public domain.

Version:

1.0.2

Author:

Viliam Holub

Constructor Summary

Constructors

Constructor	Description
MurmurHash()

Method Summary

Modifier and Type	Method	Description
static int	hash32(byte[] data, int length)	Generates 32-bit hash from byte array with default seed value.
static int	hash32(byte[] data, int length, int seed)	Generates 32-bit hash from byte array of the given length and seed.
static int	hash32(String text)	Generates 32-bit hash from a string.
static int	hash32(String text, int from, int length)	Generates 32-bit hash from a substring.
static long	hash64(byte[] data, int length)	Generates 64-bit hash from byte array with default seed value.
static long	hash64(byte[] data, int length, int seed)	Generates 64-bit hash from byte array of the given length and seed.
static long	hash64(String text)	Generates 64-bit hash from a string.
static long	hash64(String text, int from, int length)	Generates 64-bit hash from a substring.

Methods inherited from class java.lang.Object

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

Constructor Detail

MurmurHash

public MurmurHash()

Method Detail

hash32

public static int hash32(byte[] data,
                         int length,
                         int seed)

Generates 32-bit hash from byte array of the given length and seed.

Parameters:

data - byte array to hash

length - length of the array to hash

seed - initial seed value

Returns:

32-bit hash of the given array

hash32

public static int hash32(byte[] data,
                         int length)

Generates 32-bit hash from byte array with default seed value.

Parameters:

data - byte array to hash

length - length of the array to hash

Returns:

32-bit hash of the given array

hash32

public static int hash32(String text)

Generates 32-bit hash from a string.

Parameters:

text - string to hash

Returns:

32-bit hash of the given string

hash32

public static int hash32(String text,
                         int from,
                         int length)

Generates 32-bit hash from a substring.

Parameters:

text - string to hash

from - starting index

length - length of the substring to hash

Returns:

32-bit hash of the given string

hash64

public static long hash64(byte[] data,
                          int length,
                          int seed)

Generates 64-bit hash from byte array of the given length and seed.

Parameters:

data - byte array to hash

length - length of the array to hash

seed - initial seed value

Returns:

64-bit hash of the given array

hash64

public static long hash64(byte[] data,
                          int length)

Generates 64-bit hash from byte array with default seed value.

Parameters:

data - byte array to hash

length - length of the array to hash

Returns:

64-bit hash of the given string

hash64

public static long hash64(String text)

Generates 64-bit hash from a string.

Parameters:

text - string to hash

Returns:

64-bit hash of the given string

hash64

public static long hash64(String text,
                          int from,
                          int length)

Generates 64-bit hash from a substring.

Parameters:

text - string to hash

from - starting index

length - length of the substring to hash

Returns:

64-bit hash of the given array