public VehicleRoutingSolution build()

in use-cases/vehicle-routing/src/main/java/org/acme/vehiclerouting/bootstrap/DemoDataBuilder.java [81:166]
71 lines of code
10 McCabe index (conditional complexity)

    public VehicleRoutingSolution build() {
        if (minDemand < 1) {
            throw new IllegalStateException("minDemand (" + minDemand + ") must be greater than zero.");
        }
        if (maxDemand < 1) {
            throw new IllegalStateException("maxDemand (" + maxDemand + ") must be greater than zero.");
        }
        if (minDemand >= maxDemand) {
            throw new IllegalStateException("maxDemand (" + maxDemand + ") must be greater than minDemand ("
                    + minDemand + ").");
        }
        if (vehicleCapacity < 1) {
            throw new IllegalStateException(
                    "Number of vehicleCapacity (" + vehicleCapacity + ") must be greater than zero.");
        }
        if (customerCount < 1) {
            throw new IllegalStateException(
                    "Number of customerCount (" + customerCount + ") must be greater than zero.");
        }
        if (vehicleCount < 1) {
            throw new IllegalStateException(
                    "Number of vehicleCount (" + vehicleCount + ") must be greater than zero.");
        }
        if (depotCount < 1) {
            throw new IllegalStateException(
                    "Number of depotCount (" + depotCount + ") must be greater than zero.");
        }

        if (northEastCorner.getLatitude() <= southWestCorner.getLatitude()) {
            throw new IllegalStateException("northEastCorner.getLatitude (" + northEastCorner.getLatitude()
                    + ") must be greater than southWestCorner.getLatitude(" + southWestCorner.getLatitude() + ").");
        }

        if (northEastCorner.getLongitude() <= southWestCorner.getLongitude()) {
            throw new IllegalStateException("northEastCorner.getLongitude (" + northEastCorner.getLongitude()
                    + ") must be greater than southWestCorner.getLongitude(" + southWestCorner.getLongitude() + ").");
        }

        String name = "demo";

        Random random = new Random(0);
        PrimitiveIterator.OfDouble latitudes = random
                .doubles(southWestCorner.getLatitude(), northEastCorner.getLatitude()).iterator();
        PrimitiveIterator.OfDouble longitudes = random
                .doubles(southWestCorner.getLongitude(), northEastCorner.getLongitude()).iterator();

        PrimitiveIterator.OfInt demand = random.ints(minDemand, maxDemand + 1).iterator();

        PrimitiveIterator.OfInt depotRandom = random.ints(0, depotCount).iterator();

        Supplier<Depot> depotSupplier = () -> new Depot(
                sequence.incrementAndGet(),
                new Location(sequence.incrementAndGet(), latitudes.nextDouble(), longitudes.nextDouble()));

        List<Depot> depotList = Stream.generate(depotSupplier)
                .limit(depotCount)
                .collect(Collectors.toList());

        Supplier<Vehicle> vehicleSupplier = () -> new Vehicle(
                sequence.incrementAndGet(),
                vehicleCapacity,
                depotList.get(depotRandom.nextInt()));

        List<Vehicle> vehicleList = Stream.generate(vehicleSupplier)
                .limit(vehicleCount)
                .collect(Collectors.toList());

        Supplier<Customer> customerSupplier = () -> new Customer(
                sequence.incrementAndGet(),
                new Location(sequence.incrementAndGet(), latitudes.nextDouble(), longitudes.nextDouble()),
                demand.nextInt());

        List<Customer> customerList = Stream.generate(customerSupplier)
                .limit(customerCount)
                .collect(Collectors.toList());

        List<Location> locationList = Stream.concat(
                        customerList.stream().map(Customer::getLocation),
                        depotList.stream().map(Depot::getLocation))
                .collect(Collectors.toList());

        distanceCalculator.initDistanceMaps(locationList);

        return new VehicleRoutingSolution(name, locationList,
                depotList, vehicleList, customerList, southWestCorner, northEastCorner);
    }