org.optaplanner.examples.vehiclerouting.domain.solver.DepotDistanceCustomerDifficultyWeightFactory 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 the examples which demonstrate how to use it in a normal Java application.

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/*
 * Copyright 2014 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.vehiclerouting.domain.solver;

import static java.util.Comparator.comparingLong;

import java.util.Comparator;

import org.optaplanner.core.impl.heuristic.selector.common.decorator.SelectionSorterWeightFactory;
import org.optaplanner.examples.vehiclerouting.domain.Customer;
import org.optaplanner.examples.vehiclerouting.domain.Depot;
import org.optaplanner.examples.vehiclerouting.domain.VehicleRoutingSolution;

/**
 * On large datasets, the constructed solution looks like a Matryoshka doll.
 */
public class DepotDistanceCustomerDifficultyWeightFactory
        implements SelectionSorterWeightFactory {

    @Override
    public DepotDistanceCustomerDifficultyWeight createSorterWeight(VehicleRoutingSolution vehicleRoutingSolution,
            Customer customer) {
        Depot depot = vehicleRoutingSolution.getDepotList().get(0);
        return new DepotDistanceCustomerDifficultyWeight(customer,
                customer.getLocation().getDistanceTo(depot.getLocation())
                        + depot.getLocation().getDistanceTo(customer.getLocation()));
    }

    public static class DepotDistanceCustomerDifficultyWeight
            implements Comparable {

        private static final Comparator COMPARATOR =
                // Ascending (further from the depot are more difficult)
                comparingLong((DepotDistanceCustomerDifficultyWeight weight) -> weight.depotRoundTripDistance)
                        .thenComparingInt(weight -> weight.customer.getDemand())
                        .thenComparingDouble(weight -> weight.customer.getLocation().getLatitude())
                        .thenComparingDouble(weight -> weight.customer.getLocation().getLongitude())
                        .thenComparing(weight -> weight.customer, comparingLong(Customer::getId));

        private final Customer customer;
        private final long depotRoundTripDistance;

        public DepotDistanceCustomerDifficultyWeight(Customer customer,
                long depotRoundTripDistance) {
            this.customer = customer;
            this.depotRoundTripDistance = depotRoundTripDistance;
        }

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