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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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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * 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
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.optaplanner.constraint.streams.drools.tri;

import java.util.function.Supplier;

import org.optaplanner.constraint.streams.drools.DroolsConstraintFactory;
import org.optaplanner.constraint.streams.drools.bi.DroolsAbstractBiConstraintStream;
import org.optaplanner.constraint.streams.drools.common.TriLeftHandSide;
import org.optaplanner.constraint.streams.drools.uni.DroolsAbstractUniConstraintStream;
import org.optaplanner.core.api.score.stream.tri.TriJoiner;

public final class DroolsJoinTriConstraintStream
        extends DroolsAbstractTriConstraintStream {

    private final Supplier> leftHandSide;
    private final boolean guaranteesDistinct;

    public DroolsJoinTriConstraintStream(DroolsConstraintFactory constraintFactory,
            DroolsAbstractBiConstraintStream parent,
            DroolsAbstractUniConstraintStream otherStream, TriJoiner joiner) {
        super(constraintFactory, parent.getRetrievalSemantics());
        this.leftHandSide = () -> parent.createLeftHandSide().andJoin(otherStream.createLeftHandSide(), joiner);
        this.guaranteesDistinct = parent.guaranteesDistinct() && otherStream.guaranteesDistinct();
    }

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

    // ************************************************************************
    // Pattern creation
    // ************************************************************************

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

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

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

}