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

import java.util.Set;

import org.optaplanner.constraint.streams.bavet.BavetConstraintFactory;
import org.optaplanner.constraint.streams.bavet.common.BavetAbstractConstraintStream;
import org.optaplanner.constraint.streams.bavet.common.NodeBuildHelper;
import org.optaplanner.core.api.score.Score;
import org.optaplanner.core.api.score.stream.ConstraintStream;

public final class BavetFlattenLastQuadConstraintStream
        extends BavetAbstractQuadConstraintStream {

    private final BavetAbstractConstraintStream parent;

    public BavetFlattenLastQuadConstraintStream(BavetConstraintFactory constraintFactory,
            BavetAbstractConstraintStream parent) {
        super(constraintFactory, parent.getRetrievalSemantics());
        this.parent = parent;
    }

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

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

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

    @Override
    public ConstraintStream getTupleSource() {
        return this;
    }

    @Override
    public > void buildNode(NodeBuildHelper buildHelper) {
        // Do nothing. BavetFlattenLastBridgeUniConstraintStream, etc build everything.
    }

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

    // TODO

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

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

}