org.optaplanner.constraint.streams.bavet.bi.BavetUniGroupBridgeBiConstraintStream Maven / Gradle / Ivy

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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.bi;

import java.util.Set;

import org.optaplanner.constraint.streams.bavet.BavetConstraintFactory;
import org.optaplanner.constraint.streams.bavet.common.AbstractGroupNode;
import org.optaplanner.constraint.streams.bavet.common.BavetAbstractConstraintStream;
import org.optaplanner.constraint.streams.bavet.common.NodeBuildHelper;
import org.optaplanner.constraint.streams.bavet.common.TupleLifecycle;
import org.optaplanner.constraint.streams.bavet.uni.BavetGroupUniConstraintStream;
import org.optaplanner.constraint.streams.bavet.uni.UniTuple;
import org.optaplanner.core.api.score.Score;
import org.optaplanner.core.api.score.stream.ConstraintStream;

final class BavetUniGroupBridgeBiConstraintStream
        extends BavetAbstractBiConstraintStream {

    private final BavetAbstractBiConstraintStream parent;
    private BavetGroupUniConstraintStream groupStream;
    private final BiGroupNodeConstructor> nodeConstructor;

    public BavetUniGroupBridgeBiConstraintStream(BavetConstraintFactory constraintFactory,
            BavetAbstractBiConstraintStream parent,
            BiGroupNodeConstructor> nodeConstructor) {
        super(constraintFactory, parent.getRetrievalSemantics());
        this.parent = parent;
        this.nodeConstructor = nodeConstructor;
    }

    @Override
    public boolean guaranteesDistinct() {
        return true;
    }

    public void setGroupStream(BavetGroupUniConstraintStream groupStream) {
        this.groupStream = groupStream;
    }

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

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

    @Override
    public final > void buildNode(NodeBuildHelper buildHelper) {
        if (!childStreamList.isEmpty()) {
            throw new IllegalStateException("Impossible state: the stream (" + this
                    + ") has an non-empty childStreamList (" + childStreamList + ") but it's a groupBy bridge.");
        }
        int inputStoreIndex = buildHelper.reserveTupleStoreIndex(parent.getTupleSource());
        TupleLifecycle> tupleLifecycle =
                buildHelper.getAggregatedTupleLifecycle(groupStream.getChildStreamList());
        int outputStoreSize = buildHelper.extractTupleStoreSize(groupStream);
        AbstractGroupNode, UniTuple, ?, ?, ?, ?> node =
                nodeConstructor.apply(inputStoreIndex, tupleLifecycle, outputStoreSize);
        buildHelper.addNode(node, this);
    }

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

}