Module ai.tutor.cab302exceptionalhandlers

Package ai.tutor.cab302exceptionalhandlers.controller

Class LoginController

java.lang.Object

ai.tutor.cab302exceptionalhandlers.controller.AuthController

ai.tutor.cab302exceptionalhandlers.controller.LoginController

public class LoginController
extends AuthController

Controls the login screen for creating new user accounts in the AI tutor application.

Extends AuthController to inherit common authentication logic and UI handling. Manages the login form, validates user input (username, password), and access existing users in the database via UserDAO.

See Also:

• AuthController
• User

Field Summary

Fields inherited from class ai.tutor.cab302exceptionalhandlers.controller.AuthController

confirmPasswordField, db, passwordEmpty, passwordFeedback, passwordField, submitButton, switchLayout, userDAO, usernameEmpty, usernameFeedback, usernameField

Constructor Summary

Constructors

Constructor	Description
LoginController(SQLiteConnection db)

Method Summary

Modifier and Type	Method	Description
User	authenticateUser(String username, String password)	Authenticates an existing user with the provided username and password.
protected void	onFieldChanged(javafx.scene.input.KeyEvent e)	Handles key events in the login form’s text fields to track input changes.
protected void	onSubmit()	Processes the sign-up form submission to create a new user account.
protected void	submitButtonToggle()	Enables or disables the submit button based on input field states.

Methods inherited from class ai.tutor.cab302exceptionalhandlers.controller.AuthController

errorFeedback, initialize, loadChat, resetErrorFeedback, setupInputField, setupSubmitButton, setupSwitchLayoutButton, switchLayout

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

LoginController

public LoginController(SQLiteConnection db)
                throws RuntimeException,
SQLException

Throws:

RuntimeException

SQLException

Method Details

onFieldChanged

protected void onFieldChanged(javafx.scene.input.KeyEvent e)

Handles key events in the login form’s text fields to track input changes.

Updates boolean flags (usernameEmpty and passwordEmpty based on whether the username or password fields are empty. Calls submitButtonToggle() to enable or disable the submit button accordingly.

Specified by:

onFieldChanged in class AuthController

Parameters:

e - The key event triggered by typing in a text field

submitButtonToggle

protected void submitButtonToggle()

Enables or disables the submit button based on input field states.

Disables the button if any of usernameEmpty or passwordEmpty is true, ensuring all fields are filled before submission.

Specified by:

submitButtonToggle in class AuthController

onSubmit

protected void onSubmit()

Processes the sign-up form submission to create a new user account.

Retrieves the username, password, and confirm password from the form fields. Validates that the passwords match, authenticates the user via authenticateUser(String, String), and navigates to the chat screen if successful. Displays error feedback for invalid inputs or mismatches.

Specified by:

onSubmit in class AuthController

authenticateUser

public User authenticateUser(String username,
 String password)
                      throws IllegalArgumentException,
SecurityException,
SQLException

Authenticates an existing user with the provided username and password.

Checks for an existing username, and verifies the password hashUser.verifyPassword(String) via UserDAO.getUser(String), and creates the user in the database if valid.

Specified by:

authenticateUser in class AuthController

Parameters:

username - The username for the existing user

password - The password to be verified against the hashed password

Returns:

The existing User object

Throws:

IllegalArgumentException - If the username does not exist

SecurityException - if the password is incorrect to the hash verification

SQLException - If database operations fail