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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.tri;

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.quad.DefaultQuadJoiner;
import org.optaplanner.core.api.function.QuadPredicate;
import org.optaplanner.core.api.score.Score;
import org.optaplanner.core.api.score.stream.ConstraintStream;

final class BavetIfExistsTriConstraintStream
        extends BavetAbstractTriConstraintStream {

    private final BavetAbstractTriConstraintStream parentABC;
    private final BavetIfExistsBridgeUniConstraintStream parentBridgeD;

    private final boolean shouldExist;
    private final DefaultQuadJoiner joiner;
    private final QuadPredicate filtering;

    public BavetIfExistsTriConstraintStream(BavetConstraintFactory constraintFactory,
            BavetAbstractTriConstraintStream parentABC,
            BavetIfExistsBridgeUniConstraintStream parentBridgeD,
            boolean shouldExist,
            DefaultQuadJoiner joiner, QuadPredicate filtering) {
        super(constraintFactory, parentABC.getRetrievalSemantics());
        this.parentABC = parentABC;
        this.parentBridgeD = parentBridgeD;
        this.shouldExist = shouldExist;
        this.joiner = joiner;
        this.filtering = filtering;
    }

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

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

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

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

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

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

    // TODO

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

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

}