Inventory Management Objectives Use Inheritance To Cr 955802

Inventory Managementobjectives Use Inheritance To Create Base And Ch

Implement an inventory management system for a small electronics company, incorporating role-based access control (RBAC), dynamic menu loading, user authentication, and inventory operations. Use inheritance to create base and derived classes, facilitate multiple classes within the program, validate user input, and apply polymorphism.

Paper For Above instruction

The development of an inventory management system for a small electronics company requires a structured approach to ensure security, flexibility, and scalability. Using object-oriented programming principles such as inheritance and polymorphism allows the system to be modular and adaptable to future changes. Additionally, role-based access control (RBAC) enhances security by restricting functionalities based on user roles (manager or employee).

Design and Implementation Approach

The system architecture revolves around several core classes: a User class hierarchy, a Menu class for dynamic menu management, a Product class, and a ProductCatalog for inventory operations. Integration of these components through inheritance and interfaces forms the backbone of the application.

User Class Hierarchy and Authentication

At the foundation lies an abstract User class that contains common attributes such as first name, last name, username, and hashed password. Derived classes like Manager and Employee inherit from User and may implement role-specific functionalities. The system begins with an authentication process where the user provides credentials, which are validated against stored data in Users.dat. A special super-user "admin" with password "admin" is hardcoded for initial setup.

Authentication involves reading the file, handling case-insensitive usernames, and verifying hashed passwords, employing secure hashing algorithms like SHA-256. Input validation ensures that username and password formats meet criteria, and invalid entries prompt re-entry or exit options.

Role-Based Menu Management

The menu system loads options dynamically from MenuList.dat, enabling flexibility in menu configuration, reordering, and descriptive updates without code changes. Each menu item contains a description, a Boolean flag indicating if it is restricted to managers, and a command name matching a class in the codebase (e.g., AddUserCommand).

The Menu class uses inheritance for the command classes, with a base abstract Command class implementing an execute() method, and concrete subclasses for each command. Polymorphism allows invoking the correct command through a unified interface. Access restrictions are enforced based on the user's role, ensuring that employees only see non-restricted options.

Inventory Classes and Operations

The inventory management relies on Product and ProductCatalog classes. Product represents individual items with attributes such as ID, name, cost, quantity, and margin. ProductCatalog manages a collection of products, implementing methods for adding, removing, finding, and updating products.

New products are added via the AddProductCommand class, which prompts for product details, performs input validation, and updates the inventory. Update, delete, and display operations are similarly encapsulated, following inheritance principles for polymorphism, enabling easy extension or modification.

When displaying product information, retail prices are calculated dynamically as: Retail Price = Cost + (Margin * Cost/100). This calculation is/or can be encapsulated within the Product class, ensuring data consistency and encapsulation.

File Management and Data Persistence

All data storage utilizes comma-separated files: Users.dat for user credentials and roles, MenuList.dat for menu configurations, and Inventory.dat for product data. Reading and writing to these files is encapsulated within dedicated methods, with proper error handling if files are missing or corrupted.

On startup, the application loads user data and inventory. Modifications such as adding users or updating inventory are reflected immediately in the files to ensure persistent state across sessions.

Program Flow and User Interaction

The main method manages the overall program flow, beginning with user authentication allowing repeated attempts until success or exit. Post-authentication, the menu is dynamically generated, displayed, and user choices are processed. Commands executed are based on user roles, with restricted commands blocked for employees.

The system remains in a loop, prompting until the user chooses to exit. Each command invokes corresponding class methods, following the command pattern, which promotes clean separation of functionality and ease of maintenance.

Input Validation and Security Measures

Throughout the program, all user inputs—such as usernames, passwords, and product details—are validated for correctness and format. Password change procedures require validation of existing passwords before updating. Hash comparisons are used to authenticate users securely, avoiding plaintext password storage.

Testing and Quality Assurance

To ensure robustness, unit test methods are created for core functionalities, including security features ( AuthenticateUser, AddNewUser, RemoveUser, ChangePassword), menu management (AddMenuItem), and inventory operations (AddUpdateProduct, RemoveProduct, FindProduct, PrintProductInformation, PrintInventoryList). These tests validate method correctness and facilitate future refactoring or extensions.

Conclusion

This design leverages inheritance for role-based user accounts and command execution, making the system flexible and scalable. Dynamic menu loading from external files provides configurability without code alterations, while secure data handling and input validation protect against common security issues. The adherence to object-oriented principles results in a maintainable, extensible inventory management application aligned with the company's security and operational needs.

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