Package org.apache.datasketches.hash

Class XxHash

java.lang.Object
org.apache.datasketches.hash.XxHash
public class XxHash extends Object
The XxHash is a fast, non-cryptographic, 64-bit hash function that has excellent avalanche and 2-way bit independence properties.

This class wraps the Memory Component XxHash implementation.

Author:
Lee Rhodes

  • Constructor Summary

    Constructors
    Constructor
    Description
    XxHash()
     

  • Method Summary

    Modifier and Type
    Method
    Description
    static long
    hash(long in, long seed)
    Returns a 64-bit hash.
    static long
    hash(org.apache.datasketches.memory.Memory mem, long offsetBytes, long lengthBytes, long seed)
    Compute the hash of the given Memory object.

    Methods inherited from class java.lang.Object

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

  • Constructor Details

    • XxHash

      public XxHash()

  • Method Details

    • hash

      public static long hash(org.apache.datasketches.memory.Memory mem, long offsetBytes, long lengthBytes, long seed)
      Compute the hash of the given Memory object.
      Parameters:
      mem - The given Memory object
      offsetBytes - Starting at this offset in bytes
      lengthBytes - Continuing for this number of bytes
      seed - use this seed for the hash function
      Returns:
      return the resulting 64-bit hash value.

    • hash

      public static long hash(long in, long seed)
      Returns a 64-bit hash.
      Parameters:
      in - a long
      seed - A long valued seed.
      Returns:
      the hash