Package org.eclipse.rdf4j.query.parser.sparql.aggregate

Interface AggregateFunctionFactory

All Known Implementing Classes:

PopulationStandardDeviationAggregateFactory, PopulationVarianceAggregateFactory, StandardDeviationAggregateFactory, VarianceAggregateFactory

@Experimental
public interface AggregateFunctionFactory

Factory for a registered AggregateFunction that is evaluated in the same fashion as standard aggregate functions e.g.Sum invalid input: '&' Count

Author:

Tomas Kovachev t.kovachev1996@gmail.com

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()

Method Details

getIri

String getIri()

Returns:

the identifier associated with given function

buildFunction

AggregateFunction buildFunction(Function<BindingSet,Value> evaluationStep)

Builds an aggregate function with input evaluation step

Parameters:

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

Returns:

an aggregate function evaluator

getCollector

AggregateCollector getCollector()

Returns:

result collector associated with given function type