Package org.eclipse.rdf4j.query.algebra.evaluation.function.aggregate.variance

Class PopulationVarianceAggregateFactory

java.lang.Object

org.eclipse.rdf4j.query.algebra.evaluation.function.aggregate.variance.PopulationVarianceAggregateFactory

All Implemented Interfaces:

AggregateFunctionFactory

@Experimental
public class PopulationVarianceAggregateFactory
extends Object
implements AggregateFunctionFactory

AggregateFunctionFactory implementation that provides AggregateFunction used for processing population variance.

Author:

Tomas Kovachev t.kovachev1996@gmail.com

Constructor Summary

Constructors

Constructor	Description
PopulationVarianceAggregateFactory()

Method Summary

Modifier and Type	Method	Description
AggregateFunction	buildFunction(Function<BindingSet,Value> evaluationStep)	Builds an aggregate function with input evaluation step
AggregateCollector	getCollector()
String	getIri()

Methods inherited from class java.lang.Object

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

Constructor Details

PopulationVarianceAggregateFactory

public PopulationVarianceAggregateFactory()

Method Details

getIri

public String getIri()

Specified by:

getIri in interface AggregateFunctionFactory

Returns:

the identifier associated with given function

buildFunction

public AggregateFunction buildFunction(Function<BindingSet,Value> evaluationStep)

Description copied from interface: AggregateFunctionFactory

Builds an aggregate function with input evaluation step

Specified by:

buildFunction in interface AggregateFunctionFactory

Parameters:

evaluationStep - used to process values from an iterator's binding set

Returns:

an aggregate function evaluator

getCollector

public AggregateCollector getCollector()

Specified by:

getCollector in interface AggregateFunctionFactory

Returns:

result collector associated with given function type