com.carrotsearch.hppcrt.hash

Class BitMixer

java.lang.Object

com.carrotsearch.hppcrt.hash.BitMixer

public final class BitMixer
extends java.lang.Object

Bit mixing utilities. The purpose of these methods is to evenly distribute key space over int32 range.

Method Summary

Modifier and Type	Method and Description
static int	mix(byte k) Mix a byte.
static int	mix(byte k, int seed) Mix a byte perturbated by a seed.
static int	mix(char k) Mix a char.
static int	mix(char k, int seed) Mix a char perturbated by a seed.
static int	mix(double x) Mix a double.
static int	mix(double x, int seed) Mix a double perturbated by a seed.
static int	mix(float x) Mix a float.
static int	mix(float x, int seed) Mix a float perturbated by a seed.
static int	mix(int key) Mix an int.
static int	mix(int k, int seed) Mix an int perturbated by a seed.
static int	mix(long z) Mix a long.
static int	mix(long z, int seed) Mix a long perturbated by a seed.
static int	mix(java.lang.Object key) Mix an Object instance Object.hashCode().
static int	mix(short k) Mix a short.
static int	mix(short k, int seed) Mix a short perturbated by a seed.

Methods inherited from class java.lang.Object

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

Method Detail

mix

public static int mix(byte k)

Mix a byte.

Parameters:

k - a byte.

Returns:

an int hash value obtained by mixing the bits of k.

mix

public static int mix(byte k,
                      int seed)

Mix a byte perturbated by a seed.

Parameters:

k - a byte.

seed - a perturbation value

Returns:

an int hash value obtained by mixing the bits of k.

mix

public static int mix(short k)

Mix a short.

Parameters:

k - a short.

Returns:

an int hash value obtained by mixing the bits of k.

mix

public static int mix(short k,
                      int seed)

Mix a short perturbated by a seed.

Parameters:

k - a short.

seed - a perturbation value

Returns:

an int hash value obtained by mixing the bits of k.

mix

public static int mix(char k)

Mix a char.

Parameters:

k - a char.

Returns:

an int hash value obtained by mixing the bits of k.

mix

public static int mix(char k,
                      int seed)

Mix a char perturbated by a seed.

Parameters:

k - a char.

seed - a perturbation value

Returns:

an int hash value obtained by mixing the bits of k.

mix

public static int mix(int key)

Mix an int.

Parameters:

k - an integer.

seed - a perturbation value

Returns:

an int hash value obtained by mixing the bits of k.

mix

public static int mix(int k,
                      int seed)

Mix an int perturbated by a seed.

Parameters:

k - an integer.

seed - a perturbation value

Returns:

an int hash value obtained by mixing the bits of k.

mix

public static int mix(float x)

Mix a float.

Parameters:

x - a float.

seed - a perturbation value

Returns:

an int hash value obtained by mixing the bits of x.

mix

public static int mix(float x,
                      int seed)

Mix a float perturbated by a seed.

Parameters:

x - a float.

seed - a perturbation value

Returns:

an int hash value obtained by mixing the bits of x.

mix

public static int mix(double x)

Mix a double.

Parameters:

x - a double.

Returns:

an int hash value obtained by mixing the bits of x.

mix

public static int mix(double x,
                      int seed)

Mix a double perturbated by a seed.

Parameters:

x - a double.

seed - a perturbation value

Returns:

a int hash value obtained by mixing the bits of x.

mix

public static int mix(long z)

Mix a long.

Parameters:

z - a long integer.

seed - a perturbation value

Returns:

an int hash value obtained by mixing the bits of z.

mix

public static int mix(long z,
                      int seed)

Mix a long perturbated by a seed.

Parameters:

z - a long integer.

seed - a perturbation value

Returns:

an int hash value obtained by mixing the bits of z.

mix

public static int mix(java.lang.Object key)

Mix an Object instance Object.hashCode().

Parameters:

key - an Object instance.

Returns:

an int hash value obtained by mixing the bits of key.hashCode(), or 0 if key is null.