Package tools.refinery.interpreter.matchers.aggregators

Class DoubleAverageOperator

java.lang.Object

tools.refinery.interpreter.matchers.aggregators.DoubleAverageOperator

All Implemented Interfaces:

IMultisetAggregationOperator<Double,tools.refinery.interpreter.matchers.aggregators.AverageAccumulator<Double>,Double>

public class DoubleAverageOperator
extends Object
implements IMultisetAggregationOperator<Double,tools.refinery.interpreter.matchers.aggregators.AverageAccumulator<Double>,Double>

Since:

2.0

Field Summary

Fields

Modifier and Type	Field	Description
static final DoubleAverageOperator	INSTANCE

Method Summary

Modifier and Type	Method	Description
Double	aggregateStream(Stream<Double> stream)	Calculates the aggregate results from a given stream of values; all values are considered as inserted
tools.refinery.interpreter.matchers.aggregators.AverageAccumulator<Double>	clone(tools.refinery.interpreter.matchers.aggregators.AverageAccumulator<Double> original)	Clones the given accumulator (with all its internal contents).
tools.refinery.interpreter.matchers.aggregators.AverageAccumulator<Double>	createNeutral()
Double	getAggregate(tools.refinery.interpreter.matchers.aggregators.AverageAccumulator<Double> result)
String	getName()	A name or identifier of the operator.
String	getShortDescription()	A textual description of the operator.
boolean	isNeutral(tools.refinery.interpreter.matchers.aggregators.AverageAccumulator<Double> result)
tools.refinery.interpreter.matchers.aggregators.AverageAccumulator<Double>	update(tools.refinery.interpreter.matchers.aggregators.AverageAccumulator<Double> oldResult, Double updateValue, boolean isInsertion)

Methods inherited from class java.lang.Object

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

Methods inherited from interface tools.refinery.interpreter.matchers.psystem.aggregations.IMultisetAggregationOperator

combine, contains, prettyPrint

Field Details

INSTANCE

public static final DoubleAverageOperator INSTANCE

Method Details

getShortDescription

public String getShortDescription()

Description copied from interface: IMultisetAggregationOperator

A textual description of the operator.

Specified by:

getShortDescription in interface IMultisetAggregationOperator<Double,tools.refinery.interpreter.matchers.aggregators.AverageAccumulator<Double>,Double>

getName

public String getName()

Description copied from interface: IMultisetAggregationOperator

A name or identifier of the operator.

Specified by:

getName in interface IMultisetAggregationOperator<Double,tools.refinery.interpreter.matchers.aggregators.AverageAccumulator<Double>,Double>

createNeutral

public tools.refinery.interpreter.matchers.aggregators.AverageAccumulator<Double> createNeutral()

Specified by:

createNeutral in interface IMultisetAggregationOperator<Double,tools.refinery.interpreter.matchers.aggregators.AverageAccumulator<Double>,Double>

Returns:

the neutral element, i.e. the interim result of aggregating an empty multiset.

isNeutral

public boolean isNeutral(tools.refinery.interpreter.matchers.aggregators.AverageAccumulator<Double> result)

Specified by:

isNeutral in interface IMultisetAggregationOperator<Double,tools.refinery.interpreter.matchers.aggregators.AverageAccumulator<Double>,Double>

Returns:

true if the interim result is equivalent to the neutral element, as if there are no values in the multiset. Must return true if the multiset is empty.

update

public tools.refinery.interpreter.matchers.aggregators.AverageAccumulator<Double> update(tools.refinery.interpreter.matchers.aggregators.AverageAccumulator<Double> oldResult,
 Double updateValue,
 boolean isInsertion)

Specified by:

update in interface IMultisetAggregationOperator<Double,tools.refinery.interpreter.matchers.aggregators.AverageAccumulator<Double>,Double>

Returns:

an updated intermediate result, changed to reflect that a given object was added to / removed from the multiset (as indicated by the parameter isInsertion)

getAggregate

public Double getAggregate(tools.refinery.interpreter.matchers.aggregators.AverageAccumulator<Double> result)

Specified by:

getAggregate in interface IMultisetAggregationOperator<Double,tools.refinery.interpreter.matchers.aggregators.AverageAccumulator<Double>,Double>

Returns:

the aggregate result obtained from the given intermediate result. May be null to indicate that the current multiset cannot be aggregated (e.g. 0 elements have no minimum).

aggregateStream

public Double aggregateStream(Stream<Double> stream)

Description copied from interface: IMultisetAggregationOperator

Calculates the aggregate results from a given stream of values; all values are considered as inserted

Specified by:

aggregateStream in interface IMultisetAggregationOperator<Double,tools.refinery.interpreter.matchers.aggregators.AverageAccumulator<Double>,Double>

Returns:

the aggregate result, or null if no result can be calculated (e.g. because of an empty stream)

clone

public tools.refinery.interpreter.matchers.aggregators.AverageAccumulator<Double> clone(tools.refinery.interpreter.matchers.aggregators.AverageAccumulator<Double> original)

Description copied from interface: IMultisetAggregationOperator

Clones the given accumulator (with all its internal contents).

Specified by:

clone in interface IMultisetAggregationOperator<Double,tools.refinery.interpreter.matchers.aggregators.AverageAccumulator<Double>,Double>

Since:

2.4