cn.hutool.core.lang.hash

Class MurmurHash

java.lang.Object

cn.hutool.core.lang.hash.MurmurHash

All Implemented Interfaces:

Serializable

public class MurmurHash
extends Object
implements Serializable

Murmur3 32bit、64bit、128bit 哈希算法实现
此算法来自于：https://github.com/xlturing/Simhash4J/blob/master/src/main/java/bee/simhash/main/Murmur3.java

32-bit Java port of https://code.google.com/p/smhasher/source/browse/trunk/MurmurHash3.cpp#94
128-bit Java port of https://code.google.com/p/smhasher/source/browse/trunk/MurmurHash3.cpp#255

Since:

4.3.3

Author:

looly, Simhash4J

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor and Description
MurmurHash()

Method Summary

Modifier and Type	Method and Description
static long[]	hash128(byte[] data) Murmur3 128-bit 算法.
static long[]	hash128(byte[] data, int length, int seed) Murmur3 128-bit variant.
static long[]	hash128(byte[] data, int offset, int length, int seed) Murmur3 128-bit variant.
static long[]	hash128(CharSequence data) Murmur3 128-bit Hash值计算
static int	hash32(byte[] data) Murmur3 32-bit Hash值计算
static int	hash32(byte[] data, int length, int seed) Murmur3 32-bit Hash值计算
static int	hash32(byte[] data, int offset, int length, int seed) Murmur3 32-bit Hash值计算
static int	hash32(CharSequence data) Murmur3 32-bit Hash值计算
static long	hash64(byte[] data) Murmur3 64-bit 算法 This is essentially MSB 8 bytes of Murmur3 128-bit variant.
static long	hash64(byte[] data, int length, int seed) 类Murmur3 64-bit 算法 This is essentially MSB 8 bytes of Murmur3 128-bit variant.
static long	hash64(CharSequence data) Murmur3 64-bit Hash值计算

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(CharSequence data)

Murmur3 32-bit Hash值计算

Parameters:

data - 数据

Returns:

Hash值

hash32

public static int hash32(byte[] data)

Murmur3 32-bit Hash值计算

Parameters:

data - 数据

Returns:

Hash值

hash32

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

Murmur3 32-bit Hash值计算

Parameters:

data - 数据

length - 长度

seed - 种子，默认0

Returns:

Hash值

hash32

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

Murmur3 32-bit Hash值计算

Parameters:

data - 数据

offset - 数据开始位置

length - 长度

seed - 种子，默认0

Returns:

Hash值

hash64

public static long hash64(CharSequence data)

Murmur3 64-bit Hash值计算

Parameters:

data - 数据

Returns:

Hash值

hash64

public static long hash64(byte[] data)

Murmur3 64-bit 算法
This is essentially MSB 8 bytes of Murmur3 128-bit variant.

Parameters:

data - 数据

Returns:

Hash值

hash64

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

类Murmur3 64-bit 算法
This is essentially MSB 8 bytes of Murmur3 128-bit variant.

Parameters:

data - 数据

length - 长度

seed - 种子，默认0

Returns:

Hash值

hash128

public static long[] hash128(CharSequence data)

Murmur3 128-bit Hash值计算

Parameters:

data - 数据

Returns:

Hash值 (2 longs)

hash128

public static long[] hash128(byte[] data)

Murmur3 128-bit 算法.

Parameters:

data - -数据

Returns:

Hash值 (2 longs)

hash128

public static long[] hash128(byte[] data,
                             int length,
                             int seed)

Murmur3 128-bit variant.

Parameters:

data - 数据

length - 长度

seed - 种子，默认0

Returns:

Hash值(2 longs)

hash128

public static long[] hash128(byte[] data,
                             int offset,
                             int length,
                             int seed)

Murmur3 128-bit variant.

Parameters:

data - 数据

offset - 数据开始位置

length - 长度

seed - 种子，默认0

Returns:

Hash值(2 longs)