/**
* Iterates through all the parking lots until it finds one that is not occupied.
*
* @return The first unoccupied <em>ParkingSpot<T></em> it finds in the parking lot. This method
* throws an <em>IllegalStateException</em> in case there are no available parking spots.
*/
private ParkingSpot<T> getFreeSpot() {
ParkingSpot<T> spot = null;
for (ParkingSpot<T> sc : parkingLot) {
if (!sc.isOccupied()) {
spot = sc;
break;
}
}
if (spot == null) {
throw new IllegalStateException("The parking lot is full!");
}
return spot;
}
