org.optaplanner.examples.vehiclerouting.domain.solver.DepotAngleCustomerDifficultyWeightFactory Maven / Gradle / Ivy
/*
* 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.comparingDouble;
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 pizza slices.
*/
public class DepotAngleCustomerDifficultyWeightFactory
implements SelectionSorterWeightFactory {
@Override
public DepotAngleCustomerDifficultyWeight createSorterWeight(VehicleRoutingSolution vehicleRoutingSolution,
Customer customer) {
Depot depot = vehicleRoutingSolution.getDepotList().get(0);
return new DepotAngleCustomerDifficultyWeight(customer,
customer.getLocation().getAngle(depot.getLocation()),
customer.getLocation().getDistanceTo(depot.getLocation())
+ depot.getLocation().getDistanceTo(customer.getLocation()));
}
public static class DepotAngleCustomerDifficultyWeight
implements Comparable {
private static final Comparator COMPARATOR = comparingDouble(
(DepotAngleCustomerDifficultyWeight weight) -> weight.depotAngle)
.thenComparingLong(weight -> weight.depotRoundTripDistance) // Ascending (further from the depot are more difficult)
.thenComparing(weight -> weight.customer, comparingLong(Customer::getId));
private final Customer customer;
private final double depotAngle;
private final long depotRoundTripDistance;
public DepotAngleCustomerDifficultyWeight(Customer customer,
double depotAngle, long depotRoundTripDistance) {
this.customer = customer;
this.depotAngle = depotAngle;
this.depotRoundTripDistance = depotRoundTripDistance;
}
@Override
public int compareTo(DepotAngleCustomerDifficultyWeight other) {
return COMPARATOR.compare(this, other);
}
}
}