Class MurmurHash2

This is a very fast, non-cryptographic hash suitable for general hash-based lookup. See http://murmurhash.googlepages.com/ for more details.

The C version of MurmurHash 2.0 found at that site was ported to Java by Andrzej Bialecki (ab at getopt org).

The code from getopt.org was adapted by Mark Harwood in the form here as one of a pluggable choice of hashing functions as the core function had to be adapted to work with Lucene.Net.Util.BytesRefs with offsets and lengths rather than raw byte arrays.

Note

This API is experimental and might change in incompatible ways in the next release.

Inheritance

object

HashFunction

MurmurHash2

Inherited Members

object.Equals(object)

object.Equals(object, object)

object.GetHashCode()

object.GetType()

object.ReferenceEquals(object, object)

object.ToString()

Namespace: Lucene.Net.Codecs.Bloom

Assembly: Lucene.Net.Codecs.dll

Syntax

public sealed class MurmurHash2 : HashFunction

Fields

INSTANCE

This is a very fast, non-cryptographic hash suitable for general hash-based lookup. See http://murmurhash.googlepages.com/ for more details.

The C version of MurmurHash 2.0 found at that site was ported to Java by Andrzej Bialecki (ab at getopt org).

The code from getopt.org was adapted by Mark Harwood in the form here as one of a pluggable choice of hashing functions as the core function had to be adapted to work with Lucene.Net.Util.BytesRefs with offsets and lengths rather than raw byte arrays.

Note

This API is experimental and might change in incompatible ways in the next release.

Declaration

public static readonly MurmurHash2 INSTANCE

Field Value

Type	Description
MurmurHash2

Methods

Hash(BytesRef)

Hashes the contents of the referenced bytes.

Declaration

public override int Hash(BytesRef br)

Parameters

Type	Name	Description
BytesRef	br

Returns

Type	Description
int	The hash of the bytes referenced by bytes.offset and length bytes.Length.

Overrides

HashFunction.Hash(BytesRef)

Hash(byte[], int, int, int)

This is a very fast, non-cryptographic hash suitable for general hash-based lookup. See http://murmurhash.googlepages.com/ for more details.

The C version of MurmurHash 2.0 found at that site was ported to Java by Andrzej Bialecki (ab at getopt org).

The code from getopt.org was adapted by Mark Harwood in the form here as one of a pluggable choice of hashing functions as the core function had to be adapted to work with Lucene.Net.Util.BytesRefs with offsets and lengths rather than raw byte arrays.

Note

This API is experimental and might change in incompatible ways in the next release.

Declaration

public static int Hash(byte[] data, int seed, int offset, int len)

Parameters

Type	Name	Description
byte[]	data
int	seed
int	offset
int	len

Returns

Type	Description
int

Hash32(byte[], int, int)

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

Declaration

public static int Hash32(byte[] data, int offset, int len)

Parameters

Type	Name	Description
byte[]	data	Byte array to hash.
int	offset	The start position in the array to hash.
int	len	Length of the array elements to hash.

Returns

Type	Description
int	32 bit hash of the given array.