Class JenkinsSmallFast32

java.lang.Object

org.apache.commons.rng.core.BaseProvider

org.apache.commons.rng.core.source32.IntProvider

org.apache.commons.rng.core.source32.JenkinsSmallFast32

All Implemented Interfaces:

RandomIntSource, RestorableUniformRandomProvider, UniformRandomProvider

public class JenkinsSmallFast32
extends IntProvider

Implement Bob Jenkins's small fast (JSF) 32-bit generator.

The state size is 128-bits; the shortest period is expected to be about 2⁹⁴ and it expected that about one seed will run into another seed within 2⁶⁴ values.

Since:

1.3

See Also:

• A small noncryptographic PRNG

Field Summary

Fields

Modifier and Type	Field	Description
private int	a	State a.
private int	b	State b.
private int	c	State c.
private int	d	Statd d.

Constructor Summary

Constructors

Constructor	Description
JenkinsSmallFast32(Integer seed)	Creates an instance with the given seed.

Method Summary

Modifier and Type	Method	Description
protected byte[]	getStateInternal()	Creates a snapshot of the RNG state.
final int	next()	Return the next random value.
private void	setSeedInternal(int seed)	Seeds the RNG.
protected void	setStateInternal(byte[] s)	Resets the RNG to the given state.

Methods inherited from class IntProvider

nextBoolean, nextBytes, nextBytes, nextBytesFill, nextDouble, nextInt, nextLong, resetCachedState

Methods inherited from class BaseProvider

checkIndex, checkStateSize, composeStateInternal, extendSeed, extendSeed, fillState, fillState, restoreState, saveState, splitStateInternal, toString

Methods inherited from class Object

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

Methods inherited from interface UniformRandomProvider

doubles, doubles, doubles, doubles, ints, ints, ints, ints, longs, longs, longs, longs, nextDouble, nextDouble, nextFloat, nextFloat, nextFloat, nextInt, nextInt, nextLong, nextLong

Field Details

a

private int a

State a.

b

private int b

State b.

c

private int c

State c.

d

private int d

Statd d.

Constructor Details

JenkinsSmallFast32

public JenkinsSmallFast32(Integer seed)

Creates an instance with the given seed.

Parameters:

seed - Initial seed.

Method Details

setSeedInternal

private void setSeedInternal(int seed)

Seeds the RNG.

Parameters:

seed - Seed.

next

public final int next()

Return the next random value.

Returns:

the next random value.

getStateInternal

protected byte[] getStateInternal()

Creates a snapshot of the RNG state.

Overrides:

getStateInternal in class IntProvider

Returns:

the internal state.

setStateInternal

protected void setStateInternal(byte[] s)

Resets the RNG to the given state.

Overrides:

setStateInternal in class IntProvider

Parameters:

s - State (previously obtained by a call to BaseProvider.getStateInternal()).

See Also:

• BaseProvider.checkStateSize(byte[],int)