def test_get_slot_number_for_age_with_empty_result(self):
service = ParkingService()
vehicle_1 = Vehicle('mock_reg_num_1', 22)
vehicle_2 = Vehicle('mock_reg_num_2', 25)
service.create_parking_lot(3)
service.park(vehicle_1)
service.park(vehicle_2)
self.assertEqual(service.get_slot_number_for_age(18), [])
def test_get_slot_number_for_reg_number_invalid_vehicle(self):
service = ParkingService()
vehicle_1 = Vehicle('mock_reg_num_1', 22)
vehicle_2 = Vehicle('mock_reg_num_2', 25)
service.create_parking_lot(3)
service.park(vehicle_1)
service.park(vehicle_2)
self.assertIsNone(
service.get_slot_number_for_reg_number('mock_reg_num_3'))
def test_get_slot_number_for_age_with_non_empty_result(self):
service = ParkingService()
vehicle_1 = Vehicle('mock_reg_num_1', 22)
vehicle_2 = Vehicle('mock_reg_num_2', 25)
vehicle_3 = Vehicle('mock_reg_num_3', 22)
service.create_parking_lot(3)
service.park(vehicle_1)
service.park(vehicle_2)
service.park(vehicle_3)
expected = ['1', '3']
self.assertEqual(service.get_slot_number_for_age(22), expected)
class RequestParser:
"""Parser class for parsing and executing user commands.
Attributes:
parking_service (ParkingService): Instance of the parking service, will be used to execute user commands
"""
def __init__(self):
self.parking_service = ParkingService()
def parse(self, params):
"""Method to parse (command to execution process) a single line of commands, broken into tokens
Args:
params (List[str]): List of tokens obtained from single user command
Raises:
CommandNotFoundException: Raised when the user command is invalid.
InvalidInputException: Raised when the command is valid, but the number of arguments don't match the required number
"""
command_str = params[0].upper()
if command_str not in CommandUtils.COMMAND_LIST:
raise CommandNotFoundException(command_str)
command = Commands[command_str]
if len(params) != CommandUtils.VALIDATION_MAP[command]:
raise InvalidInputException(command, params)
self.execute_command(command, params[1:])
def execute_command(self, command, params):
"""Method to execute a valid command
Args:
command (Commands): Command enum, denoting the command to be executed
params (List[str]): List of string parameters required to execute the command
"""
if command == Commands.CREATE_PARKING_LOT:
capacity = self.parking_service.create_parking_lot(
capacity=int(params[0]))
print(f'Created parking of {capacity} slots')
elif command == Commands.PARK:
vehicle = Vehicle(reg_num=params[0], age=int(params[2]))
slot_id = self.parking_service.park(vehicle=vehicle)
if slot_id:
print(
f'Car with vehicle registration number "{vehicle.get_reg_num()}" has been parked at slot number {slot_id}'
)
elif command == Commands.LEAVE:
vehicle = self.parking_service.leave(slot_id=int(params[0]))
if vehicle:
print(
f'Slot number {params[0]} vacated, the car with vehicle registration number "{vehicle.get_reg_num()}" left the space, the driver of the car was of age {vehicle.get_age()}'
)
elif command == Commands.SLOT_NUMBER_FOR_CAR_WITH_NUMBER:
slot_id = self.parking_service.get_slot_number_for_reg_number(
reg_num=params[0])
if slot_id:
print(slot_id)
else:
print('Vehicle not found.')
elif command == Commands.SLOT_NUMBERS_FOR_DRIVER_OF_AGE:
slot_ids = self.parking_service.get_slot_number_for_age(
age=int(params[0]))
if slot_ids:
print(','.join(slot_ids))
else:
print('null')
elif command == Commands.VEHICLE_REGISTRATION_NUMBER_FOR_DRIVER_OF_AGE:
reg_nums = self.parking_service.get_reg_number_for_age(
age=int(params[0]))
if reg_nums:
print(','.join(reg_nums))
else:
print('null')