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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 examples which demonstrate how to use it in a normal Java application.

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/*
 * Copyright 2015 Red Hat, Inc. and/or its affiliates.
 *
 * Licensed 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.examples.tsp.domain.solver;

import java.util.Comparator;

import org.optaplanner.core.impl.heuristic.selector.common.decorator.SelectionSorterWeightFactory;
import org.optaplanner.examples.tsp.domain.Domicile;
import org.optaplanner.examples.tsp.domain.Standstill;
import org.optaplanner.examples.tsp.domain.TspSolution;

public class DomicileDistanceStandstillStrengthWeightFactory implements SelectionSorterWeightFactory {

    @Override
    public DomicileDistanceStandstillStrengthWeight createSorterWeight(TspSolution tspSolution, Standstill standstill) {
        Domicile domicile = tspSolution.getDomicile();
        long domicileRoundTripDistance = domicile.getDistanceTo(standstill) + standstill.getDistanceTo(domicile);
        return new DomicileDistanceStandstillStrengthWeight(standstill, domicileRoundTripDistance);
    }

    public static class DomicileDistanceStandstillStrengthWeight
            implements Comparable {

        private static final Comparator COMPARATOR =
                // Decreasing: closer to depot is stronger
                Comparator.comparingLong((DomicileDistanceStandstillStrengthWeight weight) -> -weight.domicileRoundTripDistance)
                        .thenComparingDouble(weight -> weight.standstill.getLocation().getLatitude())
                        .thenComparingDouble(weight -> weight.standstill.getLocation().getLongitude());

        private final Standstill standstill;
        private final long domicileRoundTripDistance;

        public DomicileDistanceStandstillStrengthWeight(Standstill standstill, long domicileRoundTripDistance) {
            this.standstill = standstill;
            this.domicileRoundTripDistance = domicileRoundTripDistance;
        }

        @Override
        public int compareTo(DomicileDistanceStandstillStrengthWeight other) {
            return COMPARATOR.compare(this, other);
        }

    }

}