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

Class AbstractConstraintStreamHelper<Right,JoinedStream,Joiner,Predicate>

java.lang.Object

org.optaplanner.core.impl.score.stream.common.AbstractConstraintStreamHelper<Right,JoinedStream,Joiner,Predicate>

Direct Known Subclasses:

BiConstraintStreamHelper, TriConstraintStreamHelper, UniConstraintStreamHelper

public abstract class AbstractConstraintStreamHelper<Right,JoinedStream,Joiner,Predicate>
extends Object

Constructor Summary

Constructors

Constructor	Description
AbstractConstraintStreamHelper()

Method Summary

Modifier and Type	Method	Description
protected abstract JoinedStream	doJoin(UniConstraintStream<Right> otherStream)
protected abstract JoinedStream	doJoin(UniConstraintStream<Right> otherStream, Joiner joiner)
protected abstract JoinedStream	doJoin(UniConstraintStream<Right> otherStream, Joiner... joiners)
protected abstract Predicate	extractPredicate(Joiner joiner)
protected abstract JoinedStream	filter(JoinedStream stream, Predicate predicate)
protected abstract boolean	isFilteringJoiner(Joiner joiner)
JoinedStream	join(UniConstraintStream<Right> otherStream, Joiner... joiners)	Converts a set of joiners into a single composite joiner, optionally followed by some filters.
protected abstract Joiner	mergeJoiners(Joiner... joiners)
protected abstract Predicate	mergePredicates(Predicate predicate1, Predicate predicate2)

Methods inherited from class java.lang.Object

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

Constructor Detail

AbstractConstraintStreamHelper

public AbstractConstraintStreamHelper()

Method Detail

doJoin

protected abstract JoinedStream doJoin(UniConstraintStream<Right> otherStream)

doJoin

protected abstract JoinedStream doJoin(UniConstraintStream<Right> otherStream,
                                       Joiner joiner)

doJoin

protected abstract JoinedStream doJoin(UniConstraintStream<Right> otherStream,
                                       Joiner... joiners)

filter

protected abstract JoinedStream filter(JoinedStream stream,
                                       Predicate predicate)

mergeJoiners

protected abstract Joiner mergeJoiners(Joiner... joiners)

isFilteringJoiner

protected abstract boolean isFilteringJoiner(Joiner joiner)

extractPredicate

protected abstract Predicate extractPredicate(Joiner joiner)

mergePredicates

protected abstract Predicate mergePredicates(Predicate predicate1,
                                             Predicate predicate2)

join

public final JoinedStream join(UniConstraintStream<Right> otherStream,
                               Joiner... joiners)

Converts a set of joiners into a single composite joiner, optionally followed by some filters. Ensures that the joiners are properly ordered filters-last.

Parameters:

otherStream - never null

joiners - never null

Returns:

never null, stream with all the joiners applied