BernoulliSamplingExecStreamGenerator Class Reference

Bernoulli sampling data generator. More...

#include <SamplingExecStreamGenerator.h>

Inheritance diagram for BernoulliSamplingExecStreamGenerator:


Public Member Functions
	BernoulliSamplingExecStreamGenerator (boost::shared_ptr< MockProducerExecStreamGenerator > const &generatorInit, float prob, uint seed, uint nColumnsInit)
virtual int64_t	generateValue (uint iRow, uint iCol)
	Generates one data value.
Protected Attributes
boost::shared_ptr< MockProducerExecStreamGenerator >	generator
boost::scoped_ptr< BernoulliRng >	rng
uint	nColumns
uint	iChildRow
uint	iLastRow

Detailed Description

Bernoulli sampling data generator.

Produces rows from the input based on the Bernoulli sampling algorithm.

Author:: Stephan Zuercher

Definition at line 37 of file SamplingExecStreamGenerator.h.

Constructor & Destructor Documentation

BernoulliSamplingExecStreamGenerator::BernoulliSamplingExecStreamGenerator	(	boost::shared_ptr< MockProducerExecStreamGenerator > const &	generatorInit,
		float	prob,
		uint	seed,
		uint	nColumnsInit
	)			`[inline, explicit]`

Definition at line 49 of file SamplingExecStreamGenerator.h.

References rng.

00052         : generator(generatorInit),
00053           rng(new BernoulliRng(prob)),
00054           nColumns(nColumnsInit),
00055           iChildRow((uint) -1),
00056           iLastRow((uint) -1)
00057     {
00058         rng->reseed(seed);
00059     }

Member Function Documentation

virtual int64_t BernoulliSamplingExecStreamGenerator::generateValue	(	uint	iRow,
		uint	iCol
	)			`[inline, virtual]`

Generates one data value.

Parameters:

	iRow	0-based row number to generate
	iCol	0-based col number to generate

Implements MockProducerExecStreamGenerator.

Definition at line 61 of file SamplingExecStreamGenerator.h.

References generator, iChildRow, iLastRow, nColumns, and rng.

00062     {
00063         if (iRow != iLastRow) {
00064             assert(iCol == 0);
00065 
00066             iChildRow++;
00067             while (!rng->nextValue()) {
00068                 for (int i = 0; i < nColumns; i++) {
00069                     generator->generateValue(iChildRow, i);
00070                 }
00071                 iChildRow++;
00072             }
00073             iLastRow = iRow;
00074         }
00075 
00076         return generator->generateValue(iChildRow, iCol);
00077     }