org.elasticsearch.cluster.routing.operation.hash.djb

Class DjbHashFunction

java.lang.Object

org.elasticsearch.cluster.routing.operation.hash.djb.DjbHashFunction

All Implemented Interfaces:

HashFunction

public class DjbHashFunction
extends Object
implements HashFunction

This class implements the efficient hash function developed by Daniel J. Bernstein.

Constructor Summary

Constructors

Constructor and Description
DjbHashFunction()

Method Summary

Modifier and Type	Method and Description
static int	DJB_HASH(byte[] value, int offset, int length)
static int	DJB_HASH(String value)
int	hash(String routing) Calculate a hash value for routing
int	hash(String type, String id) Calculate a hash value for routing and its type

Methods inherited from class java.lang.Object

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

Constructor Detail

DjbHashFunction

public DjbHashFunction()

Method Detail

DJB_HASH

public static int DJB_HASH(String value)

DJB_HASH

public static int DJB_HASH(byte[] value,
                           int offset,
                           int length)

hash

public int hash(String routing)

Description copied from interface: HashFunction

Calculate a hash value for routing

Specified by:

hash in interface HashFunction

Parameters:

routing - String to calculate the hash value from

Returns:

hash value of the given routing string

hash

public int hash(String type,
                String id)

Description copied from interface: HashFunction

Calculate a hash value for routing and its type

Specified by:

hash in interface HashFunction

Parameters:

type - types name

Returns:

hash value of the given type and routing string