de.lmu.ifi.dbs.elki.utilities

Class UnsafeRandom

java.lang.Object

java.util.Random

de.lmu.ifi.dbs.elki.utilities.UnsafeRandom

All Implemented Interfaces:

Serializable

public class UnsafeRandom
extends Random

Drop-in replacement for Random, but not using atomic long seeds. This implementation is no longer thread-safe (but faster)!

See Also:

Serialized Form

Field Summary

Fields

Modifier and Type	Field and Description
private static long	addend
private static long	mask
private static long	multiplier
private long	seed The random seed.
private static long	serialVersionUID Serial version number.

Constructor Summary

Constructors

Constructor and Description
UnsafeRandom() Constructor called only by localRandom.initialValue.
UnsafeRandom(long seed) Constructor.

Method Summary

Methods

Modifier and Type	Method and Description
protected int	next(int bits)
void	setSeed(long seed) Throws UnsupportedOperationException.

Methods inherited from class java.util.Random

nextBoolean, nextBytes, nextDouble, nextFloat, nextGaussian, nextInt, nextInt, nextLong

Methods inherited from class java.lang.Object

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

Field Detail

serialVersionUID

private static final long serialVersionUID

Serial version number.

See Also:

Constant Field Values

multiplier

private static final long multiplier

See Also:

Constant Field Values

addend

private static final long addend

See Also:

Constant Field Values

mask

private static final long mask

See Also:

Constant Field Values

seed

private long seed

The random seed. We can't use super.seed.

Constructor Detail

UnsafeRandom

public UnsafeRandom()

Constructor called only by localRandom.initialValue.

UnsafeRandom

public UnsafeRandom(long seed)

Constructor.

Parameters:

seed - Random generator seed.

Method Detail

setSeed

public void setSeed(long seed)

Throws UnsupportedOperationException. Setting seeds in this generator is not supported.

Overrides:

setSeed in class Random

Throws:

UnsupportedOperationException - always

next

protected int next(int bits)

Overrides:

next in class Random