Package redis.clients.jedis.util

Class MurmurHash

java.lang.Object
redis.clients.jedis.util.MurmurHash
All Implemented Interfaces:
Hashing
public class MurmurHash extends Object implements Hashing
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).

  • Field Summary

    Fields inherited from interface redis.clients.jedis.util.Hashing

    MD5, md5Holder, MURMUR_HASH

  • Constructor Summary

    Constructors
    Constructor
    Description
    MurmurHash()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    long
    hash(byte[] key)
     
    static int
    hash(byte[] data, int seed)
    Hashes bytes in an array.
    static int
    hash(byte[] data, int offset, int length, int seed)
    Hashes bytes in part of an array.
    long
    hash(String key)
     
    static int
    hash(ByteBuffer buf, int seed)
    Hashes the bytes in a buffer from the current position to the limit.
    static long
    hash64A(byte[] data, int seed)
     
    static long
    hash64A(byte[] data, int offset, int length, int seed)
     
    static long
    hash64A(ByteBuffer buf, int seed)
     

    Methods inherited from class java.lang.Object

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

  • Constructor Details

    • MurmurHash

      public MurmurHash()

  • Method Details

    • hash

      public static int hash(byte[] data, int seed)
      Hashes bytes in an array.
      Parameters:
      data - The bytes to hash.
      seed - The seed for the hash.
      Returns:
      The 32 bit hash of the bytes in question.

    • hash

      public static int hash(byte[] data, int offset, int length, int seed)
      Hashes bytes in part of an array.
      Parameters:
      data - The data to hash.
      offset - Where to start munging.
      length - How many bytes to process.
      seed - The seed to start with.
      Returns:
      The 32-bit hash of the data in question.

    • hash

      public static int hash(ByteBuffer buf, int seed)
      Hashes the bytes in a buffer from the current position to the limit.
      Parameters:
      buf - The bytes to hash.
      seed - The seed for the hash.
      Returns:
      The 32 bit murmur hash of the bytes in the buffer.

    • hash64A

      public static long hash64A(byte[] data, int seed)

    • hash64A

      public static long hash64A(byte[] data, int offset, int length, int seed)

    • hash64A

      public static long hash64A(ByteBuffer buf, int seed)

    • hash

      public long hash(byte[] key)
      Specified by:
      hash in interface Hashing

    • hash

      public long hash(String key)
      Specified by:
      hash in interface Hashing