import java.util.Map;
import java.util.HashMap;

public class MapVehicleCounter extends VehicleCounter {
	
	private Map<Class<? extends Vehicle>, Count> counts;
	
	public MapVehicleCounter() {
		counts = new HashMap<Class<? extends Vehicle>, Count>();
		counts.put(Car.class, new Count());
		counts.put(Bike.class, new Count());
		counts.put(Motorbike.class, new Count());
	}
	
	public void count(Vehicle[] vehicles) {
		for (Vehicle vehicle: vehicles) {
			Count count = counts.get(vehicle.getClass());
			++count.num;
		}
	}
	
	public int getNumCars() {
		return counts.get(Car.class).num;
	}
	
	public int getNumBikes() {
		return counts.get(Bike.class).num;
	}
	
	public int getNumMotorbikes() {
		return counts.get(Motorbike.class).num;
	}
	
	private class Count {
		public int num;
	}
	
}