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OptaPlanner solves planning problems. This lightweight, embeddable planning engine implements powerful and scalable algorithms to optimize business resource scheduling and planning. This module contains implementation of Constraint streams (Bavet).

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package org.optaplanner.constraint.streams.bavet.quad;

import java.util.Set;

import org.optaplanner.constraint.streams.bavet.BavetConstraintFactory;
import org.optaplanner.constraint.streams.bavet.common.AbstractIfExistsNode;
import org.optaplanner.constraint.streams.bavet.common.BavetAbstractConstraintStream;
import org.optaplanner.constraint.streams.bavet.common.NodeBuildHelper;
import org.optaplanner.constraint.streams.bavet.common.index.IndexerFactory;
import org.optaplanner.constraint.streams.bavet.common.index.JoinerUtils;
import org.optaplanner.constraint.streams.bavet.uni.BavetIfExistsBridgeUniConstraintStream;
import org.optaplanner.constraint.streams.common.penta.DefaultPentaJoiner;
import org.optaplanner.core.api.function.PentaPredicate;
import org.optaplanner.core.api.score.Score;
import org.optaplanner.core.api.score.stream.ConstraintStream;

final class BavetIfExistsQuadConstraintStream
        extends BavetAbstractQuadConstraintStream {

    private final BavetAbstractQuadConstraintStream parentABCD;
    private final BavetIfExistsBridgeUniConstraintStream parentBridgeE;

    private final boolean shouldExist;
    private final DefaultPentaJoiner joiner;
    private final PentaPredicate filtering;

    public BavetIfExistsQuadConstraintStream(BavetConstraintFactory constraintFactory,
            BavetAbstractQuadConstraintStream parentABCD,
            BavetIfExistsBridgeUniConstraintStream parentBridgeE,
            boolean shouldExist,
            DefaultPentaJoiner joiner, PentaPredicate filtering) {
        super(constraintFactory, parentABCD.getRetrievalSemantics());
        this.parentABCD = parentABCD;
        this.parentBridgeE = parentBridgeE;
        this.shouldExist = shouldExist;
        this.joiner = joiner;
        this.filtering = filtering;
    }

    @Override
    public boolean guaranteesDistinct() {
        return parentABCD.guaranteesDistinct();
    }

    // ************************************************************************
    // Node creation
    // ************************************************************************

    @Override
    public void collectActiveConstraintStreams(Set> constraintStreamSet) {
        parentABCD.collectActiveConstraintStreams(constraintStreamSet);
        parentBridgeE.collectActiveConstraintStreams(constraintStreamSet);
        constraintStreamSet.add(this);
    }

    @Override
    public ConstraintStream getTupleSource() {
        return parentABCD.getTupleSource();
    }

    @Override
    public > void buildNode(NodeBuildHelper buildHelper) {
        int inputStoreIndexA = buildHelper.reserveTupleStoreIndex(parentABCD.getTupleSource());
        int inputStoreIndexB = buildHelper.reserveTupleStoreIndex(parentBridgeE.getTupleSource());
        IndexerFactory indexerFactory = new IndexerFactory(joiner);
        AbstractIfExistsNode, E> node = new IfExistsQuadWithUniNode<>(shouldExist,
                JoinerUtils.combineLeftMappings(joiner), JoinerUtils.combineRightMappings(joiner),
                inputStoreIndexA, inputStoreIndexB,
                buildHelper.getAggregatedTupleLifecycle(childStreamList),
                indexerFactory.buildIndexer(true), indexerFactory.buildIndexer(false),
                filtering);
        buildHelper.addNode(node, this, parentBridgeE);
    }

    // ************************************************************************
    // Equality for node sharing
    // ************************************************************************

    // TODO

    @Override
    public String toString() {
        return "IfExists() with " + childStreamList.size() + " children";
    }

    // ************************************************************************
    // Getters/setters
    // ************************************************************************

}