Class StatisticCollector

java.lang.Object

org.eclipse.rdf4j.query.algebra.evaluation.function.aggregate.StatisticCollector

All Implemented Interfaces:

AggregateCollector

Direct Known Subclasses:

StandardDeviationCollector, VarianceCollector

@Experimental
public abstract class StatisticCollector
extends Object
implements AggregateCollector

AggregateCollector implementation that processes SPARQL statistical functions based on input Literal values.

Author:

Tomas Kovachev t.kovachev1996@gmail.com

Field Summary

Fields

Modifier and Type	Field	Description
protected final boolean	population
protected final org.apache.commons.math3.stat.descriptive.SummaryStatistics	statistics
protected ValueExprEvaluationException	typeError
protected static final Literal	ZERO

Constructor Summary

Constructors

Constructor	Description
StatisticCollector(boolean population)

Method Summary

Modifier and Type	Method	Description
void	addValue(Literal val)
protected abstract Literal	computeValue()
Value	getFinalValue()
boolean	hasError()
void	setTypeError(ValueExprEvaluationException typeError)

Methods inherited from class Object

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

Field Details

ZERO

protected static final Literal ZERO

statistics

protected final org.apache.commons.math3.stat.descriptive.SummaryStatistics statistics

population

protected final boolean population

typeError

protected ValueExprEvaluationException typeError

Constructor Details

StatisticCollector

public StatisticCollector(boolean population)

Method Details

getFinalValue

public Value getFinalValue()
                    throws ValueExprEvaluationException

Specified by:

getFinalValue in interface AggregateCollector

Throws:

ValueExprEvaluationException

setTypeError

public void setTypeError(ValueExprEvaluationException typeError)

hasError

public boolean hasError()

addValue

public void addValue(Literal val)

computeValue

protected abstract Literal computeValue()