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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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package org.optaplanner.examples.vehiclerouting.persistence;

import java.io.File;
import java.util.function.Function;
import java.util.stream.Collectors;

import org.optaplanner.examples.common.persistence.AbstractJsonSolutionFileIO;
import org.optaplanner.examples.vehiclerouting.domain.VehicleRoutingSolution;
import org.optaplanner.examples.vehiclerouting.domain.location.DistanceType;
import org.optaplanner.examples.vehiclerouting.domain.location.RoadLocation;
import org.optaplanner.examples.vehiclerouting.domain.location.segmented.HubSegmentLocation;
import org.optaplanner.examples.vehiclerouting.domain.location.segmented.RoadSegmentLocation;

public class VehicleRoutingSolutionFileIO extends AbstractJsonSolutionFileIO {

    public VehicleRoutingSolutionFileIO() {
        super(VehicleRoutingSolution.class);
    }

    @Override
    public VehicleRoutingSolution read(File inputSolutionFile) {
        VehicleRoutingSolution vehicleRoutingSolution = super.read(inputSolutionFile);

        if (vehicleRoutingSolution.getDistanceType() == DistanceType.ROAD_DISTANCE) {
            deduplicateRoadLocations(vehicleRoutingSolution);
        } else if (vehicleRoutingSolution.getDistanceType() == DistanceType.SEGMENTED_ROAD_DISTANCE) {
            deduplicateRoadSegments(vehicleRoutingSolution);
        }

        return vehicleRoutingSolution;
    }

    private void deduplicateRoadLocations(VehicleRoutingSolution vehicleRoutingSolution) {
        var roadLocationList = vehicleRoutingSolution.getLocationList().stream()
                .filter(location -> location instanceof RoadLocation)
                .map(location -> (RoadLocation) location)
                .collect(Collectors.toList());
        var locationsById = roadLocationList.stream()
                .collect(Collectors.toMap(RoadLocation::getId, Function.identity()));
        /*
         * Replace the duplicate RoadLocation instances in the travelDistanceMap by references to instances from
         * the locationList.
         */
        for (RoadLocation roadLocation : roadLocationList) {
            var newTravelDistanceMap = deduplicateMap(roadLocation.getTravelDistanceMap(),
                    locationsById, RoadLocation::getId);
            roadLocation.setTravelDistanceMap(newTravelDistanceMap);
        }
    }

    private void deduplicateRoadSegments(VehicleRoutingSolution vehicleRoutingSolution) {
        var hubSegmentLocationList = vehicleRoutingSolution.getLocationList().stream()
                .filter(location -> location instanceof HubSegmentLocation)
                .map(location -> (HubSegmentLocation) location)
                .collect(Collectors.toList());
        var roadSegmentLocationList = vehicleRoutingSolution.getLocationList().stream()
                .filter(location -> location instanceof RoadSegmentLocation)
                .map(location -> (RoadSegmentLocation) location)
                .collect(Collectors.toList());
        var hubSegmentLocationsById = hubSegmentLocationList.stream()
                .collect(Collectors.toMap(HubSegmentLocation::getId, Function.identity()));
        var roadSegmentLocationsById = roadSegmentLocationList.stream()
                .collect(Collectors.toMap(RoadSegmentLocation::getId, Function.identity()));

        for (HubSegmentLocation hubSegmentLocation : hubSegmentLocationList) {
            var newHubTravelDistanceMap = deduplicateMap(hubSegmentLocation.getHubTravelDistanceMap(),
                    hubSegmentLocationsById, HubSegmentLocation::getId);
            var newNearbyTravelDistanceMap = deduplicateMap(hubSegmentLocation.getNearbyTravelDistanceMap(),
                    roadSegmentLocationsById, RoadSegmentLocation::getId);
            hubSegmentLocation.setHubTravelDistanceMap(newHubTravelDistanceMap);
            hubSegmentLocation.setNearbyTravelDistanceMap(newNearbyTravelDistanceMap);
        }

        for (RoadSegmentLocation roadSegmentLocation : roadSegmentLocationList) {
            var newHubTravelDistanceMap = deduplicateMap(roadSegmentLocation.getHubTravelDistanceMap(),
                    hubSegmentLocationsById, HubSegmentLocation::getId);
            var newNearbyTravelDistanceMap = deduplicateMap(roadSegmentLocation.getNearbyTravelDistanceMap(),
                    roadSegmentLocationsById, RoadSegmentLocation::getId);
            roadSegmentLocation.setHubTravelDistanceMap(newHubTravelDistanceMap);
            roadSegmentLocation.setNearbyTravelDistanceMap(newNearbyTravelDistanceMap);
        }
    }
}