org.elasticsearch.common.hash

Enum MurmurHash3

java.lang.Object

java.lang.Enum<MurmurHash3>

org.elasticsearch.common.hash.MurmurHash3

All Implemented Interfaces:

java.io.Serializable, java.lang.Comparable<MurmurHash3>

public enum MurmurHash3
extends java.lang.Enum<MurmurHash3>

MurmurHash3 hashing functions.

Nested Class Summary

Nested Classes

Modifier and Type	Class and Description
static class	MurmurHash3.Hash128 A 128-bits hash.

Method Summary

Modifier and Type	Method and Description
protected static long	fmix(long k)
protected static long	getblock(byte[] key, int offset, int index)
static MurmurHash3.Hash128	hash128(byte[] key, int offset, int length, long seed, MurmurHash3.Hash128 hash) Compute the hash of the MurmurHash3_x64_128 hashing function.
static MurmurHash3	valueOf(java.lang.String name) Returns the enum constant of this type with the specified name.
static MurmurHash3[]	values() Returns an array containing the constants of this enum type, in the order they are declared.

Methods inherited from class java.lang.Enum

clone, compareTo, equals, finalize, getDeclaringClass, hashCode, name, ordinal, toString, valueOf

Methods inherited from class java.lang.Object

getClass, notify, notifyAll, wait, wait, wait

Method Detail

values

public static MurmurHash3[] values()

Returns an array containing the constants of this enum type, in the order they are declared. This method may be used to iterate over the constants as follows:

for (MurmurHash3 c : MurmurHash3.values())
    System.out.println(c);

Returns:

an array containing the constants of this enum type, in the order they are declared

valueOf

public static MurmurHash3 valueOf(java.lang.String name)

Returns the enum constant of this type with the specified name. The string must match exactly an identifier used to declare an enum constant in this type. (Extraneous whitespace characters are not permitted.)

Parameters:

name - the name of the enum constant to be returned.

Returns:

the enum constant with the specified name

Throws:

java.lang.IllegalArgumentException - if this enum type has no constant with the specified name

java.lang.NullPointerException - if the argument is null

getblock

protected static long getblock(byte[] key,
                               int offset,
                               int index)

fmix

protected static long fmix(long k)

hash128

public static MurmurHash3.Hash128 hash128(byte[] key,
                                          int offset,
                                          int length,
                                          long seed,
                                          MurmurHash3.Hash128 hash)

Compute the hash of the MurmurHash3_x64_128 hashing function. Note, this hashing function might be used to persist hashes, so if the way hashes are computed changes for some reason, it needs to be addressed (like in BloomFilter and MurmurHashField).