Package org.elasticsearch.common.hash

Class Murmur3Hasher

java.lang.Object

org.elasticsearch.common.hash.Murmur3Hasher

public class Murmur3Hasher
extends Object

Wraps MurmurHash3 to provide an interface similar to MessageDigest that allows hashing of byte arrays passed through multiple calls to update(byte[]). Like MessageDigest, this class maintains internal state during the calculation of the hash and is not threadsafe. If concurrent hashes are to be computed, each must be done on a separate instance.

Field Summary

Fields

Modifier and Type	Field	Description
static String	METHOD

Constructor Summary

Constructors

Constructor	Description
Murmur3Hasher(long seed)

Method Summary

Modifier and Type	Method	Description
byte[]	digest()	Completes the hash of all bytes previously passed to update(byte[]).
String	getAlgorithm()
void	reset()	Clears all bytes previously passed to update(byte[]) and prepares for the calculation of a new hash.
static MurmurHash3.Hash128	toHash128(byte[] doubleLongBytes)	Converts the 128-bit byte array returned by digest() to a MurmurHash3.Hash128
void	update(byte[] inputBytes)	Supplies some or all of the bytes to be hashed.

Methods inherited from class java.lang.Object

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

Field Details

METHOD

public static final String METHOD

See Also:

Constant Field Values

Constructor Details

Murmur3Hasher

public Murmur3Hasher(long seed)

Method Details

update

public void update(byte[] inputBytes)

Supplies some or all of the bytes to be hashed. Multiple calls to this method may be made to sequentially supply the bytes for hashing. Once all bytes have been supplied, the digest() method should be called to complete the hash calculation.

reset

public void reset()

Clears all bytes previously passed to update(byte[]) and prepares for the calculation of a new hash.

digest

public byte[] digest()

Completes the hash of all bytes previously passed to update(byte[]).

getAlgorithm

public String getAlgorithm()

toHash128

public static MurmurHash3.Hash128 toHash128(byte[] doubleLongBytes)

Converts the 128-bit byte array returned by digest() to a MurmurHash3.Hash128