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We'll cover the following:
A Car Rental System is a software built to handle the renting of automobiles for a short period of time, generally ranging from a few hours to a few weeks. A car rental system often has numerous local branches (to allow its user to return a vehicle to a different location), and primarily located near airports or busy city areas.
Car Rental System
We will focus on the following set of requirements while designing our Car Rental System:
We have four main Actors in our system:
Here are the top use cases of the Car Rental System:
Here is the use case diagram of our Car Rental System:
Use Case Diagram for Car Rental System
Here are the main classes of our Car Rental System:
Class Diagram for Car Rental System
UML for Car Rental System
Pick up a vehicle: Any member can perform this activity. Here are the steps to pick up a vehicle:
Activity Diagram for Car Rental System Pick Up
Return a vehicle: Any worker can perform this activity. While returning a vehicle, the system must collect a late fee from the member if the return date is after the due date. Here are the steps for returning a vehicle:
Activity Diagram for Car Rental System Return
Here is the high-level definition for the classes described above.
Enums, data types and constants: Here are the required enums, data types, and constants:
from enum import Enum class BillItemType(Enum): BASE_CHARGE, ADDITIONAL_SERVICE, FINE, OTHER = 1, 2, 3, 4 class VehicleLogType(Enum): ACCIDENT, FUELING, CLEANING_SERVICE, OIL_CHANGE, REPAIR, OTHER = 1, 2, 3, 4, 5, 6 class VanType(Enum): PASSENGER, CARGO = 1, 2 class CarType(Enum): ECONOMY, COMPACT, INTERMEDIATE, STANDARD, FULL_SIZE, PREMIUM, LUXURY = 1, 2, 3, 4, 5, 6, 7 class VehicleStatus(Enum): AVAILABLE, RESERVED, LOANED, LOST, BEING_SERVICED, OTHER = 1, 2, 3, 4, 5, 6 class ReservationStatus(Enum): ACTIVE, PENDING, CONFIRMED, COMPLETED, CANCELLED, NONE = 1, 2, 3, 4, 5, 6 class AccountStatus(Enum): ACTIVE, CLOSED, CANCELED, BLACKLISTED, BLOCKED = 1, 2, 3, 4, 5 class PaymentStatus(Enum): UNPAID, PENDING, COMPLETED, FILLED, DECLINED, CANCELLED, ABANDONED, SETTLING, SETTLED, REFUNDED = 1, 2, 3, 4, 5, 6, 7, 8, 9, 10 class Address: def __init__(self, street, city, state, zip_code, country): self.__street_address = street self.__city = city self.__state = state self.__zip_code = zip_code self.__country = country class Person(): def __init__(self, name, address, email, phone): self.__name = name self.__address = address self.__email = email self.__phone = phone
Account, Member, Receptionist, and Additional Driver: These classes represent different people that interact with our system:
from abc import ABC from .constants import AccountStatus # For simplicity, we are not defining getter and setter functions. The reader can # assume that all class attributes are private and accessed through their respective # public getter methods and modified only through their public methods function. class Account(ABC): def __init__(self, id, password, person, status=AccountStatus.NONE): self.__id = id self.__password = password self.__status = AccountStatus.NONE self.__person = person def reset_password(self): None class Member(Account): def __init__(self): self.__total_vehicles_reserved = 0 def get_reservations(self): None class Receptionist(Account): def __init__(self, date_joined): self.__date_joined = date_joined def search_member(self, name): None class AdditionalDriver: def __init__(self, id, person): self.__driver_id = id self.__person = person
CarRentalSystem and CarRentalLocation: These classes represent the top level classes:
class CarRentalLocation: def __init__(self, name, address): self.__name = name self.__location = address def get_location(self): return self.__location class CarRentalSystem: def __init__(self, name): self.__name = name self.__locations = [] def add_new_location(self, location): None
Vehicle, VehicleLog, and VehicleReservation: To encapsulate a vehicle, log, and reservation. The VehicleReservation class will be responsible for processing the reservation and return of a vehicle:
from abc import ABC from datetime import datetime from .constants import ReservationStatus class Vehicle(ABC): def __init__(self, license_num, stock_num, capacity, barcode, has_sunroof, status, model, make, manufacturing_year, mileage): self.__license_number = license_num self.__stock_number = stock_num self.__passenger_capacity = capacity self.__barcode = barcode self.__has_sunroof = has_sunroof self.__status = status self.__model = model self.__make = make self.__manufacturing_year = manufacturing_year self.__mileage = mileage self.__log = [] def reserve_vehicle(self): None def return_vehicle(self): None class Car(Vehicle): def __init__(self, license_num, stock_num, capacity, barcode, has_sunroof, status, model, make, manufacturing_year, mileage, type): super().__init__(license_num, stock_num, capacity, barcode, has_sunroof, status, model, make, manufacturing_year, mileage) self.__type = type class Van(Vehicle): def __init__(self, license_num, stock_num, capacity, barcode, has_sunroof, status, model, make, manufacturing_year, mileage, type): super().__init__(license_num, stock_num, capacity, barcode, has_sunroof, status, model, make, manufacturing_year, mileage) self.__type = type class Truck(Vehicle): def __init__(self, license_num, stock_num, capacity, barcode, has_sunroof, status, model, make, manufacturing_year, mileage, type): super().__init__(license_num, stock_num, capacity, barcode, has_sunroof, status, model, make, manufacturing_year, mileage) self.__type = type # We can have similar definition for other vehicle types # . class VehicleLog: def __init__(self, id, type, description, creation_date): self.__id = id self.__type = type self.__description = description self.__creation_date = creation_date def update(self): None def search_by_log_type(self, type): None class VehicleReservation: def __init__(self, reservation_number): self.__reservation_number = reservation_number self.__creation_date = datetime.date.today() self.__status = ReservationStatus.ACTIVE self.__due_date = datetime.date.today() self.__return_date = datetime.date.today() self.__pickup_location_name = "" self.__return_location_name = "" self.__customer_id = 0 self.__vehicle = None self.__bill = None self.__additional_drivers = [] self.__notifications = [] self.__insurances = [] self.__equipments = [] self.__services = [] def fetch_reservation_details(self, reservation_number): None def get_additional_drivers(self): return self.__additional_drivers
VehicleInventory and Search: VehicleInventory will implement an interface ‘Search’ to facilitate the searching of vehicles:
from abc import ABC class Search(ABC): def search_by_type(self, type): None def search_by_model(self, model): None class VehicleInventory(Search): def __init__(self): self.__vehicle_types = <> self.__vehicle_models = <> def search_by_type(self, query): # return all vehicles of the given type. return self.__vehicle_types.get(query) def search_by_model(self, query): # return all vehicles of the given model. return self.__vehicle_models.get(query)
