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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 the Drools implementation of Constraint streams.

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 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
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package org.optaplanner.constraint.streams.drools.bi;

import java.util.function.Function;
import java.util.function.Supplier;

import org.optaplanner.constraint.streams.drools.DroolsConstraintFactory;
import org.optaplanner.constraint.streams.drools.common.BiLeftHandSide;

public final class DroolsFlatteningBiConstraintStream
        extends DroolsAbstractBiConstraintStream {

    private final Supplier> leftHandSide;

    public  DroolsFlatteningBiConstraintStream(DroolsConstraintFactory constraintFactory,
            DroolsAbstractBiConstraintStream parent, Function> biMapping) {
        super(constraintFactory, parent.getRetrievalSemantics());
        this.leftHandSide = () -> parent.createLeftHandSide().andFlattenLast(biMapping);
    }

    @Override
    public boolean guaranteesDistinct() {
        return false; // flattening can never guarantee distinct tuples, as we do not see inside the Iterable.
    }

    @Override
    public BiLeftHandSide createLeftHandSide() {
        return leftHandSide.get();
    }

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

}




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