Flight Booking System

A Java-based flight booking application with both a CLI and a Swing GUI interface, built for the CMP5332 module at Sunway College Kathmandu (Birmingham City University). Designed around the Command pattern with role-based authentication, full booking lifecycle management, and automatic data backup with rollback support.

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Features

• Dual interface — interactive CLI for quick operations and a Swing GUI (MainWindow) for a visual experience
• Role-based authentication — ADMIN and USER roles with separate permissions; session management via AuthService
• Flight management — add, list, show, and soft-delete flights while maintaining referential integrity with existing bookings
• Customer management — register, view, update, and soft-delete customer records linked to user accounts
• Booking lifecycle — supports ACTIVE, CANCELLED, and COMPLETED statuses with a full history trail of all changes
• One-way and round-trip bookings — Booking model handles both outbound-only and outbound + return flight reservations
• Dynamic pricing — fare calculation via calculateCurrentPrice() based on flight and booking context
• Data backup & rollback — DataBackup creates timestamped backups before every save; automatically rolls back on failure and retains the last 10 backups
• Command pattern — 20 command classes (AddBooking, CancelBooking, VoidBooking, UpdateBooking, BookingHistory, etc.) all implement a shared Command interface

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Architecture

The project is organised into 6 packages:

bcu.cmp5332.bookingsystem/
├── auth/         AppUser, AuthService, Role, Session, UserStore
├── commands/     Command interface + 20 implementing classes
├── data/         DataManager, BookingDataManager, FlightDataManager,
│                 CustomerDataManager, FlightBookingSystemData, DataBackup
├── gui/          MainWindow, LoginWindow, RegisterWindow, AddFlightWindow,
│                 BookingHistoryDialog, ModernBackgroundPanel, UIUtil
├── main/         Main (entry point), CommandParser, FlightBookingSystemException
└── model/        FlightBookingSystem, Flight, Customer, Booking, BookingStatus

Command Pattern

Every CLI action implements the Command interface:

public interface Command {
    void execute(FlightBookingSystem fbs) throws Exception;
    default boolean changesState() { return true; }
}

Commands that mutate state (bookings, flights, customers) return true from changesState(), triggering an automatic save after execution.

DataBackup

DataBackup backup = new DataBackup();
try {
    backup.createBackup();           // timestamped snapshot
    FlightBookingSystemData.store(fbs);
    backup.commit();                 // mark save successful
} catch (Exception e) {
    backup.rollback();               // restore previous state
    throw e;
}

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Getting Started

Prerequisites

• Java 17+
• Maven or any Java IDE (IntelliJ IDEA, Eclipse)

Run

# Clone the repo
git clone https://github.com/SupremeStha/FlightBookingSystem.git
cd FlightBookingSystem

# Compile
javac -d out -sourcepath src src/bcu/cmp5332/bookingsystem/main/Main.java

# Run
java -cp out bcu.cmp5332.bookingsystem.main.Main

Or open in your IDE and run Main.java directly.

CLI Commands

Command	Description
login	Authenticate as a user or admin
register	Create a new user account
listflights	View all available flights
showflight <id>	View detailed flight info
addbooking <customerID> <flightID>	Book a flight
cancelbooking <customerID> <bookingID>	Cancel a booking
updatebooking	Change flight on an existing booking
mybookings	View your booking history
loadgui	Launch the Swing GUI
help	List all available commands

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Documentation

Full Javadoc is available in the docs/ folder. Open docs/index.html in a browser to browse all classes, methods, and package summaries.

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Academic Context

Developed as a group project (Group C5) for the Object-Oriented Software Development module (CMP5332) at Sunway College Kathmandu, affiliated with Birmingham City University.

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License

For educational purposes.