/*
* 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 org.apache.commons.lang3.builder.CompareToBuilder;
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<VehicleRoutingSolution, Customer> {
@Override
public Comparable 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<DepotDistanceCustomerDifficultyWeight> {
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 new CompareToBuilder()
.append(depotRoundTripDistance, other.depotRoundTripDistance) // Ascending (further from the depot are more difficult)
.append(customer.getDemand(), other.customer.getDemand())
.append(customer.getLocation().getLatitude(), other.customer.getLocation().getLatitude())
.append(customer.getLocation().getLongitude(), other.customer.getLocation().getLongitude())
.append(customer.getId(), other.customer.getId())
.toComparison();
}
}
}