Package org.apache.kafka.streams.state.internals

Class Murmur3

java.lang.Object

org.apache.kafka.streams.state.internals.Murmur3

public class Murmur3
extends Object

This class was taken from Hive org.apache.hive.common.util; https://github.com/apache/hive/blob/master/storage-api/src/java/org/apache/hive/common/util/Murmur3.java Commit: dffa3a16588bc8e95b9d0ab5af295a74e06ef702 Murmur3 is successor to Murmur2 fast non-crytographic hash algorithms. Murmur3 32 and 128 bit variants. 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 This is a public domain code with no copyrights. From homepage of MurmurHash (https://code.google.com/p/smhasher/), "All MurmurHash versions are public domain software, and the author disclaims all copyright to their code."

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
static class	Murmur3.IncrementalHash32

Field Summary

Fields

Modifier and Type	Field	Description
static int	DEFAULT_SEED
static long	NULL_HASHCODE

Constructor Summary

Constructors

Constructor	Description
Murmur3()

Method Summary

Modifier and Type	Method	Description
static long[]	hash128(byte[] data)	Murmur3 128-bit variant.
static long[]	hash128(byte[] data, int offset, int length, int seed)	Murmur3 128-bit variant.
static int	hash32(byte[] data)	Murmur3 32-bit variant.
static int	hash32(byte[] data, int length)	Murmur3 32-bit variant.
static int	hash32(byte[] data, int length, int seed)	Murmur3 32-bit variant.
static int	hash32(byte[] data, int offset, int length, int seed)	Murmur3 32-bit variant.
static int	hash32(long l0)
static int	hash32(long l0, int seed)	Murmur3 32-bit variant.
static int	hash32(long l0, long l1)
static int	hash32(long l0, long l1, int seed)	Murmur3 32-bit variant.
static long	hash64(byte[] data)	Murmur3 64-bit variant.
static long	hash64(byte[] data, int offset, int length)
static long	hash64(byte[] data, int offset, int length, int seed)	Murmur3 64-bit variant.
static long	hash64(int data)
static long	hash64(long data)
static long	hash64(short data)

Methods inherited from class java.lang.Object

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

Field Detail

NULL_HASHCODE

public static final long NULL_HASHCODE

See Also:

Constant Field Values

DEFAULT_SEED

public static final int DEFAULT_SEED

See Also:

Constant Field Values

Constructor Detail

Murmur3

public Murmur3()

Method Detail

hash32

public static int hash32(long l0,
                         long l1)

hash32

public static int hash32(long l0)

hash32

public static int hash32(long l0,
                         int seed)

Murmur3 32-bit variant.

hash32

public static int hash32(long l0,
                         long l1,
                         int seed)

Murmur3 32-bit variant.

hash32

public static int hash32(byte[] data)

Murmur3 32-bit variant.

Parameters:

data - - input byte array

Returns:

- hashcode

hash32

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

Murmur3 32-bit variant.

Parameters:

data - - input byte array

length - - length of array

Returns:

- hashcode

hash32

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

Murmur3 32-bit variant.

Parameters:

data - - input byte array

length - - length of array

seed - - seed. (default 0)

Returns:

- hashcode

hash32

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

Murmur3 32-bit variant.

Parameters:

data - - input byte array

offset - - offset of data

length - - length of array

seed - - seed. (default 0)

Returns:

- hashcode

hash64

public static long hash64(byte[] data)

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

Parameters:

data - - input byte array

Returns:

- hashcode

hash64

public static long hash64(long data)

hash64

public static long hash64(int data)

hash64

public static long hash64(short data)

hash64

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

hash64

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

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

Parameters:

data - - input byte array

length - - length of array

seed - - seed. (default is 0)

Returns:

- hashcode

hash128

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

Murmur3 128-bit variant.

Parameters:

data - - input byte array

Returns:

- hashcode (2 longs)

hash128

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

Murmur3 128-bit variant.

Parameters:

data - - input byte array

offset - - the first element of array

length - - length of array

seed - - seed. (default is 0)

Returns:

- hashcode (2 longs)