Package org.apache.hadoop.tools.rumen

Class CDFRandomGenerator

java.lang.Object

org.apache.hadoop.tools.rumen.CDFRandomGenerator

Direct Known Subclasses:

CDFPiecewiseLinearRandomGenerator

public abstract class CDFRandomGenerator
extends java.lang.Object

An instance of this class generates random values that confirm to the embedded LoggedDiscreteCDF . The discrete CDF is a pointwise approximation of the "real" CDF. We therefore have a choice of interpolation rules. A concrete subclass of this abstract class will implement valueAt(double) using a class-dependent interpolation rule.

Method Summary

Modifier and Type	Method	Description
protected int	floorIndex(double probe)
protected long	getDatumAt(int index)
protected double	getRankingAt(int index)
protected void	initializeTables(LoggedDiscreteCDF cdf)
long	randomValue()
abstract long	valueAt(double probability)

Methods inherited from class java.lang.Object

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

Method Detail

initializeTables

protected final void initializeTables(LoggedDiscreteCDF cdf)

floorIndex

protected int floorIndex(double probe)

getRankingAt

protected double getRankingAt(int index)

getDatumAt

protected long getDatumAt(int index)

randomValue

public long randomValue()

valueAt

public abstract long valueAt(double probability)