/*
* Copyright 2014 JBoss Inc
*
* 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.lang.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 pizza slices.
*/
public class DepotAngleCustomerDifficultyWeightFactory
implements SelectionSorterWeightFactory<VehicleRoutingSolution, Customer> {
public Comparable createSorterWeight(VehicleRoutingSolution vehicleRoutingSolution, Customer customer) {
Depot depot = vehicleRoutingSolution.getDepotList().get(0);
return new DepotAngleCustomerDifficultyWeight(customer,
customer.getLocation().getAngle(depot.getLocation()),
customer.getLocation().getDistance(depot.getLocation())
+ depot.getLocation().getDistance(customer.getLocation()));
}
public static class DepotAngleCustomerDifficultyWeight
implements Comparable<DepotAngleCustomerDifficultyWeight> {
private final Customer customer;
private final double depotAngle;
private final int depotRoundTripDistance;
public DepotAngleCustomerDifficultyWeight(Customer customer,
double depotAngle, int depotRoundTripDistance) {
this.customer = customer;
this.depotAngle = depotAngle;
this.depotRoundTripDistance = depotRoundTripDistance;
}
public int compareTo(DepotAngleCustomerDifficultyWeight other) {
return new CompareToBuilder()
.append(depotAngle, other.depotAngle)
.append(depotRoundTripDistance, other.depotRoundTripDistance) // Ascending (further from the depot are more difficult)
.append(customer.getId(), other.customer.getId())
.toComparison();
}
}
}