Package org.optaplanner.core.impl.score.stream.uni

Class DefaultUniConstraintCollector<A,ResultContainer_,Result_>

java.lang.Object

org.optaplanner.core.impl.score.stream.uni.DefaultUniConstraintCollector<A,ResultContainer_,Result_>

All Implemented Interfaces:

UniConstraintCollector<A,ResultContainer_,Result_>

public final class DefaultUniConstraintCollector<A,ResultContainer_,Result_>
extends Object
implements UniConstraintCollector<A,ResultContainer_,Result_>

Constructor Summary

Constructors

Constructor	Description
DefaultUniConstraintCollector(Supplier<ResultContainer_> supplier, BiFunction<ResultContainer_,A,Runnable> accumulator, Function<ResultContainer_,Result_> finisher)

Method Summary

Modifier and Type	Method	Description
BiFunction<ResultContainer_,A,Runnable>	accumulator()	A lambda that extracts data from the matched fact, accumulates it in the result container and returns an undo operation for that accumulation.
Function<ResultContainer_,Result_>	finisher()	A lambda that converts the result container into the result.
Supplier<ResultContainer_>	supplier()	A lambda that creates the result container, one for each group key combination.

Methods inherited from class java.lang.Object

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

Constructor Detail

DefaultUniConstraintCollector

public DefaultUniConstraintCollector(Supplier<ResultContainer_> supplier,
                                     BiFunction<ResultContainer_,A,Runnable> accumulator,
                                     Function<ResultContainer_,Result_> finisher)

Method Detail

supplier

public Supplier<ResultContainer_> supplier()

Description copied from interface: UniConstraintCollector

A lambda that creates the result container, one for each group key combination.

Specified by:

supplier in interface UniConstraintCollector<A,ResultContainer_,Result_>

Returns:

never null

accumulator

public BiFunction<ResultContainer_,A,Runnable> accumulator()

Description copied from interface: UniConstraintCollector

A lambda that extracts data from the matched fact, accumulates it in the result container and returns an undo operation for that accumulation.

Specified by:

accumulator in interface UniConstraintCollector<A,ResultContainer_,Result_>

Returns:

never null, the undo operation. This lamdba is called when the fact no longer matches.

finisher

public Function<ResultContainer_,Result_> finisher()

Description copied from interface: UniConstraintCollector

A lambda that converts the result container into the result.

Specified by:

finisher in interface UniConstraintCollector<A,ResultContainer_,Result_>

Returns:

null when the result would be invalid, such as maximum value from an empty container.