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.

This is a Lucene.NET EXPERIMENTAL API, use at your own risk
Inheritance
System.Object
HashFunction
MurmurHash2
Inherited Members
System.Object.Equals(System.Object)
System.Object.Equals(System.Object, System.Object)
System.Object.GetHashCode()
System.Object.GetType()
System.Object.MemberwiseClone()
System.Object.ReferenceEquals(System.Object, System.Object)
System.Object.ToString()
Namespace: Lucene.Net.Codecs.Bloom
Assembly: Lucene.Net.Codecs.dll
Syntax
public sealed class MurmurHash2 : HashFunction

Fields

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INSTANCE

Declaration
public static readonly MurmurHash2 INSTANCE
Field Value
Type Description
MurmurHash2

Methods

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Hash(BytesRef)

Declaration
public override int Hash(BytesRef br)
Parameters
Type Name Description
Lucene.Net.Util.BytesRef br
Returns
Type Description
System.Int32
Overrides
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Hash(Byte[], Int32, Int32, Int32)

Declaration
public static int Hash(byte[] data, int seed, int offset, int len)
Parameters
Type Name Description
System.Byte[] data
System.Int32 seed
System.Int32 offset
System.Int32 len
Returns
Type Description
System.Int32
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Hash32(Byte[], Int32, Int32)

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
System.Byte[] data

Byte array to hash.
System.Int32 offset

The start position in the array to hash.
System.Int32 len

Length of the array elements to hash.
Returns
Type Description
System.Int32

32 bit hash of the given array.