Merge pull request '#8 story/pfleger-module-login-pfleger' (#50) from story/pfleger-module-login-pfleger into main

Reviewed-on: #50
Reviewed-by: SZUT-Ole <ole.kueck@hmmh.de>

.idea/sqlDataSources.xml

@@ -27,9 +27,12 @@
               <option value="file://$PROJECT_DIR$/src/main/resources/de/hitec/nhplus/nurse/database/Nurse.sql" />
               <option value="file://$PROJECT_DIR$/src/main/resources/de/hitec/nhplus/medication/database/Medication.sql" />
               <option value="file://$PROJECT_DIR$/src/main/resources/de/hitec/nhplus/medication/database/Medication_Ingredient.sql" />
+              <option value="file://$PROJECT_DIR$/src/main/resources/de/hitec/nhplus/login/database/User.sql" />
+              <option value="file://$PROJECT_DIR$/src/main/resources/de/hitec/nhplus/login/database/UserPermission.sql" />
+              <option value="file://$PROJECT_DIR$/src/main/resources/de/hitec/nhplus/login/database/UserToNurse.sql" />
             </array>
           </option>
-          <option name="outLayout" value="File per object by schema.groovy" />
+          <option name="outLayout" value="File per object.groovy" />
         </State>
       </list>
     </option>

src/main/java/de/hitec/nhplus/Main.java

@@ -1,11 +1,15 @@
 package de.hitec.nhplus;
 
 import de.hitec.nhplus.datastorage.ConnectionBuilder;
+import de.hitec.nhplus.login.LoginController;
+import de.hitec.nhplus.login.User;
+import de.hitec.nhplus.main.MainWindowController;
 import javafx.application.Application;
 import javafx.application.Platform;
 import javafx.fxml.FXMLLoader;
 import javafx.scene.Scene;
 import javafx.scene.control.TabPane;
+import javafx.scene.layout.BorderPane;
 import javafx.stage.Stage;
 
 import java.io.IOException;
@@ -33,13 +37,43 @@ public class Main extends Application {
     @Override
     public void start(Stage primaryStage) {
         this.primaryStage = primaryStage;
-        executeMainApplication();
+        User user = executeLogin();
+        if(user != null){
+            executeMainApplication(user);
+        }
+    }
+
+    /**
+     * Executes the login.
+     * @return User The {@link User} object for the logged-in {@link User}.
+     * Is {@code null}, if the login was not successful,
+     */
+    private User executeLogin() {
+        try {
+
+            FXMLLoader loader = new FXMLLoader(Main.class.getResource("/de/hitec/nhplus/login/LoginView.fxml"));
+            BorderPane pane = loader.load();
+            Scene scene = new Scene(pane);
+            Stage loginStage = new Stage();
+            loginStage.setTitle("NHPlus");
+            loginStage.setScene(scene);
+            loginStage.setResizable(false);
+
+            LoginController controller = loader.getController();
+            controller.initialize(loginStage);
+
+            loginStage.showAndWait();
+            return controller.user;
+        } catch (IOException exception) {
+            exception.printStackTrace();
+            return null;
+        }
     }
 
     /**
      * Executes the main application.
      */
-    private void executeMainApplication() {
+    private void executeMainApplication(User user) {
         try {
             FXMLLoader loader = new FXMLLoader(Main.class.getResource("/de/hitec/nhplus/main/MainWindowView.fxml"));
             TabPane pane = loader.load();
@@ -48,6 +82,10 @@ public class Main extends Application {
             this.primaryStage.setTitle("NHPlus");
             this.primaryStage.setScene(scene);
             this.primaryStage.setResizable(true);
+
+            MainWindowController controller = loader.getController();
+            controller.initialize(user);
+
             this.primaryStage.show();
 
             this.primaryStage.setOnCloseRequest(event -> {

src/main/java/de/hitec/nhplus/datastorage/DaoFactory.java

@@ -1,5 +1,6 @@
 package de.hitec.nhplus.datastorage;
 
+import de.hitec.nhplus.login.database.UserDao;
 import de.hitec.nhplus.medication.database.MedicationDao;
 import de.hitec.nhplus.nurse.database.NurseDao;
 import de.hitec.nhplus.patient.database.PatientDao;
@@ -63,4 +64,12 @@ public class DaoFactory {
     public MedicationDao createMedicationDAO() {
         return new MedicationDao(ConnectionBuilder.getConnection());
     }
+
+    /**
+     * @return A new {@link UserDao} instance with a database connection.
+     * @see de.hitec.nhplus.login.User User
+     */
+    public UserDao createUserDAO() {
+        return new UserDao(ConnectionBuilder.getConnection());
+    }
 }

src/main/java/de/hitec/nhplus/fixtures/Fixtures.java

@@ -46,6 +46,11 @@ public class Fixtures {
             medicationFixture.setupTable(connection);
             medicationFixture.load();
 
+            UserFixture userFixture = new UserFixture(nursesByName);
+            userFixture.dropTable(connection);
+            userFixture.setupTable(connection);
+            userFixture.load();
+
         } catch (Exception exception) {
             System.out.println(exception.getMessage());
         }

src/main/java/de/hitec/nhplus/fixtures/NurseFixture.java

@@ -54,6 +54,12 @@ public class NurseFixture implements Fixture<Nurse> {
                 true
         ));
 
+        nurses.add(new Nurse(
+                "Maria",
+                "Höller",
+                "666"
+        ));
+
         NurseDao dao = DaoFactory.getInstance().createNurseDAO();
         for (Nurse nurse : nurses) {
             dao.create(nurse);

src/main/java/de/hitec/nhplus/fixtures/UserFixture.java

@@ -0,0 +1,108 @@
+package de.hitec.nhplus.fixtures;
+
+import de.hitec.nhplus.Main;
+import de.hitec.nhplus.datastorage.DaoFactory;
+import de.hitec.nhplus.login.Permissions;
+import de.hitec.nhplus.login.User;
+import de.hitec.nhplus.login.database.UserDao;
+import de.hitec.nhplus.nurse.Nurse;
+
+import java.io.InputStream;
+import java.nio.charset.StandardCharsets;
+import java.sql.Connection;
+import java.sql.SQLException;
+import java.util.*;
+
+/**
+ * {@link Fixture} for {@link User}.
+ *
+ * @author Dominik Säume
+ */
+public class UserFixture implements Fixture<User> {
+    private static final String SCHEMA = "/de/hitec/nhplus/login/database/User.sql";
+    private static final String PERMISSION_SCHEMA = "/de/hitec/nhplus/login/database/UserPermission.sql";
+    private static final String TO_NURSE_SCHEMA = "/de/hitec/nhplus/login/database/UserToNurse.sql";
+
+    private final Map<String, Nurse> nursesByName;
+
+    public UserFixture(Map<String, Nurse> nursesByName) {
+        this.nursesByName = nursesByName;
+    }
+
+    @Override
+    public void dropTable(Connection connection) throws SQLException {
+        connection.createStatement().execute("DROP TABLE IF EXISTS user");
+        connection.createStatement().execute("DROP TABLE IF EXISTS user__permissions");
+        connection.createStatement().execute("DROP TABLE IF EXISTS user__nurse");
+    }
+
+    @Override
+    public void setupTable(Connection connection) throws SQLException {
+        final InputStream schema = Main.class.getResourceAsStream(SCHEMA);
+        final InputStream permissionSchema = Main.class.getResourceAsStream(PERMISSION_SCHEMA);
+        final InputStream toNurseSchema = Main.class.getResourceAsStream(TO_NURSE_SCHEMA);
+
+        assert schema != null;
+        assert permissionSchema != null;
+        assert toNurseSchema != null;
+
+        String SQL = new Scanner(schema, StandardCharsets.UTF_8)
+                .useDelimiter("\\A")
+                .next();
+        String permissionSQL = new Scanner(permissionSchema, StandardCharsets.UTF_8)
+                .useDelimiter("\\A")
+                .next();
+        String toNurseSQL = new Scanner(toNurseSchema, StandardCharsets.UTF_8)
+                .useDelimiter("\\A")
+                .next();
+
+        connection.createStatement().execute(SQL);
+        connection.createStatement().execute(permissionSQL);
+        connection.createStatement().execute(toNurseSQL);
+    }
+
+    @Override
+    public Map<String, User> load() throws SQLException {
+        List<User> users = new ArrayList<>();
+
+        User udo = new User(
+                "udo",
+                Permissions.OWNER,
+                null
+        );
+        udo.setPassword("uD0_187!");
+        users.add(udo);
+
+        User maria = new User(
+                "maria",
+                Permissions.NURSE,
+                nursesByName.get("Maria")
+        );
+        maria.setPassword("H!mm3lf4hrt");
+        users.add(maria);
+
+        User werner = new User(
+                "werner",
+                Permissions.MANAGEMENT,
+                null
+        );
+        werner.setPassword("TurboSchraube42!");
+        users.add(werner);
+
+        User fullPermissionsTestUser = new User(
+                "test",
+                -1,
+                null
+        );
+        fullPermissionsTestUser.setPassword("");
+        users.add(fullPermissionsTestUser);
+
+        UserDao dao = DaoFactory.getInstance().createUserDAO();
+        Map<String, User> usersByUsername = new HashMap<>();
+        for (User user : users) {
+            dao.create(user);
+            usersByUsername.put(user.getUsername(), user);
+        }
+        return usersByUsername;
+    }
+}

src/main/java/de/hitec/nhplus/login/LoginController.java

@@ -0,0 +1,104 @@
+package de.hitec.nhplus.login;
+
+import de.hitec.nhplus.datastorage.DaoFactory;
+import de.hitec.nhplus.login.database.UserDao;
+import javafx.animation.PauseTransition;
+import javafx.animation.TranslateTransition;
+import javafx.fxml.FXML;
+import javafx.scene.control.Button;
+import javafx.scene.control.PasswordField;
+import javafx.scene.control.TextField;
+import javafx.stage.Stage;
+import javafx.util.Duration;
+
+import java.nio.charset.StandardCharsets;
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+import java.sql.SQLException;
+import java.util.Arrays;
+
+/**
+ * Controller for handling the login of {@link User}s.
+ *
+ * @author Dominik Säume
+ */
+public class LoginController {
+
+    public User user;
+    @FXML
+    public TextField textFieldUsername;
+    @FXML
+    public PasswordField passwordField;
+    @FXML
+    public Button buttonSubmit;
+    private Stage stage;
+    private int loginTries = 0;
+
+    /**
+     * JavaFX Initialization method that is called after the binding of all the fields.
+     *
+     * @param stage The {@link Stage}, so the modal can close itself, when finished.
+     */
+    public void initialize(Stage stage) {
+        this.stage = stage;
+    }
+
+    /**
+     * Internal method to handle actions on wrong logins, like a shake, timout and total tries.
+     */
+    private void handleWrongPasswordOrUsername() {
+        loginTries++;
+
+        // Shake
+        TranslateTransition ttUsername = new TranslateTransition(Duration.millis(50), textFieldUsername);
+        ttUsername.setByX(10);
+        ttUsername.setAutoReverse(true);
+        ttUsername.setCycleCount(6);
+
+        TranslateTransition ttPassword = new TranslateTransition(Duration.millis(50), passwordField);
+        ttPassword.setByX(10);
+        ttPassword.setAutoReverse(true);
+        ttPassword.setCycleCount(6);
+
+        ttUsername.play();
+        ttPassword.play();
+
+        // Timout
+        PauseTransition pause = new PauseTransition(Duration.seconds(3));
+        pause.setOnFinished(event -> {
+            if (loginTries == 3) {
+                stage.close();
+            }
+            buttonSubmit.setDisable(false);
+        });
+        pause.play();
+
+    }
+
+    @FXML
+    public void handleSubmit() {
+        buttonSubmit.setDisable(true);
+
+        UserDao dao = DaoFactory.getInstance().createUserDAO();
+        try {
+            int id = dao.readUserId(textFieldUsername.getText());
+            if (id == 0) {
+                handleWrongPasswordOrUsername();
+                return;
+            }
+            byte[] salt = dao.readPasswordSalt(id);
+            MessageDigest md = MessageDigest.getInstance("SHA-512");
+            md.update(salt);
+            byte[] hash = md.digest(passwordField.getText().getBytes(StandardCharsets.UTF_8));
+            byte[] requiredHash = dao.readPasswordHash(id);
+            if (!Arrays.equals(hash, requiredHash)) {
+                handleWrongPasswordOrUsername();
+                return;
+            }
+            user = dao.read(id);
+            stage.close();
+        } catch (SQLException | NoSuchAlgorithmException exception) {
+            exception.printStackTrace();
+        }
+    }
+}

src/main/java/de/hitec/nhplus/login/Permissions.java

@@ -0,0 +1,14 @@
+package de.hitec.nhplus.login;
+
+/**
+ * A simple class holding the bitmasks for all permissions.
+ * This is a class instead of an enum, for ease of use.
+ *
+ * @author Dominiok Säume
+ */
+public class Permissions {
+    public final static int EVERYBODY = 0b0;
+    public final static int NURSE = 0b1;
+    public final static int MANAGEMENT = 0b10;
+    public final static int OWNER = 0b100;
+}

src/main/java/de/hitec/nhplus/login/User.java

@@ -0,0 +1,120 @@
+package de.hitec.nhplus.login;
+
+import de.hitec.nhplus.nurse.Nurse;
+
+import java.nio.charset.StandardCharsets;
+import java.security.MessageDigest;
+import java.security.NoSuchAlgorithmException;
+import java.security.SecureRandom;
+
+
+/**
+ * The model for a {@link User}.
+ *
+ * @author Dominik Säume
+ */
+public class User {
+
+    private int id;
+    private String username;
+    private byte[] passwordSalt;
+    private byte[] passwordHash;
+    private int permissions = 0;
+    private Nurse nurse;
+
+
+    /**
+     * This constructor allows instantiating a {@link User} object with all existing fields.
+     */
+    public User(
+            int id,
+            String username,
+            byte[] passwordSalt,
+            byte[] passwordHash,
+            int permissions,
+            Nurse nurse
+    ) {
+        this.id = id;
+        this.username = username;
+        this.passwordSalt = passwordSalt;
+        this.passwordHash = passwordHash;
+        this.permissions = permissions;
+        this.nurse = nurse;
+    }
+
+    /**
+     * This constructor allows instantiating a {@link User} object.
+     */
+    public User(
+            String username,
+            int permissions,
+            Nurse nurse
+    ) {
+        this.username = username;
+        this.permissions = permissions;
+        this.nurse = nurse;
+    }
+
+    /**
+     * Sets the {@link User} password. The {@link User} will need to be manually stored with the
+     * {@link de.hitec.nhplus.login.database.UserDao UserDao}, for changes to persists.
+     * @param password The new Password
+     */
+    public void setPassword(String password) {
+        try {
+            SecureRandom random = new SecureRandom();
+            byte[] salt = new byte[32];
+            random.nextBytes(salt);
+            this.passwordSalt = salt;
+            MessageDigest md = MessageDigest.getInstance("SHA-512");
+            md.update(salt);
+            this.passwordHash = md.digest(password.getBytes(StandardCharsets.UTF_8));
+        }catch (NoSuchAlgorithmException exception){
+            exception.printStackTrace();
+        }
+    }
+
+    public boolean hasNursePermissions(){
+        return (permissions & Permissions.NURSE) != 0;
+    }
+
+    public boolean hasAdminPermissions(){
+        return (permissions & Permissions.MANAGEMENT) != 0;
+    }
+
+    public int getId() {
+        return id;
+    }
+
+    public byte[] getPasswordSalt() {
+        return passwordSalt;
+    }
+
+    public byte[] getPasswordHash() {
+        return passwordHash;
+    }
+
+    public String getUsername() {
+        return username;
+    }
+
+    public void setUsername(String username) {
+        this.username = username;
+    }
+
+    public int getPermissions() {
+        return permissions;
+    }
+
+    public void setPermissions(int permissions) {
+        this.permissions = permissions;
+    }
+
+    public Nurse getNurse() {
+        return nurse;
+    }
+
+    public void setNurse(Nurse nurse) {
+        this.nurse = nurse;
+    }
+}

src/main/java/de/hitec/nhplus/login/database/UserDao.java

@@ -0,0 +1,232 @@
+package de.hitec.nhplus.login.database;
+
+import de.hitec.nhplus.datastorage.Dao;
+import de.hitec.nhplus.datastorage.DaoFactory;
+import de.hitec.nhplus.login.User;
+import de.hitec.nhplus.nurse.Nurse;
+
+import java.sql.Connection;
+import java.sql.PreparedStatement;
+import java.sql.ResultSet;
+import java.sql.SQLException;
+import java.util.ArrayList;
+import java.util.List;
+
+/**
+ * The {@link UserDao} is an implementation of the{@link de.hitec.nhplus.datastorage.Dao Dao}
+ * for the {@link User} model.
+ *
+ * @author Dominik Säume
+ */
+public class UserDao implements Dao<User> {
+    protected final Connection connection;
+
+    public UserDao(Connection connection) {
+        this.connection = connection;
+    }
+
+    /**
+     * Try reading a {@link User#id} by its {@link User#username}.
+     * @param username The {@link User#username username} to try reading the {@link User#id id} of.
+     * @return The {@link User#id}. {@code 0} if the {@link User} doesn't exist.
+     */
+    public int readUserId(String username) throws SQLException {
+        final String SQL = "SELECT id FROM user WHERE username = ?";
+        PreparedStatement statement = this.connection.prepareStatement(SQL);
+        statement.setString(1, username);
+        return statement.executeQuery().getInt(1);
+    }
+
+    /**
+     * Read a {@link User}s {@link User#passwordSalt password salt}.
+     * @param id The {@link User#id} of which the {@link User#passwordSalt password salt} should be read.
+     * @return The {@link User#passwordSalt password salt} as a{@code byte[]}.
+     */
+    public byte[] readPasswordSalt(int id) throws SQLException {
+        final String SQL = "SELECT passwordSalt FROM user WHERE id = ?";
+        PreparedStatement statement = this.connection.prepareStatement(SQL);
+        statement.setInt(1, id);
+        return statement.executeQuery().getBytes(1);
+    }
+
+    /**
+     * Read a {@link User}s {@link User#passwordHash password hash} for authentication purposes.
+     * @param id The {@link User#id} of which the {@link User#passwordHash password hash} should be read.
+     * @return The {@link User#passwordHash password hash} as a{@code byte[]}.
+     */
+    public byte[] readPasswordHash(int id) throws SQLException {
+        final String SQL = "SELECT passwordHash FROM user WHERE id = ?";
+        PreparedStatement statement = this.connection.prepareStatement(SQL);
+        statement.setInt(1, id);
+        return statement.executeQuery().getBytes(1);
+    }
+
+    @Override
+    public User read(int id) throws SQLException {
+        final String SQL = """
+                        SELECT
+                        user.username,
+                        user.passwordSalt,
+                        user.passwordHash,
+                        user__permissions.permissions,
+                        user__nurse.nurseId
+                        FROM user
+                        LEFT JOIN user__permissions ON user.id = user__permissions.userId
+                        LEFT JOIN user__nurse ON user.id = user__nurse.userId
+                        WHERE user.id = ?;
+                """;
+        PreparedStatement statement = this.connection.prepareStatement(SQL);
+        statement.setInt(1, id);
+        ResultSet result = statement.executeQuery();
+        int nurseId = result.getInt(5);
+        Nurse nurse = null;
+        if (!result.wasNull()) {
+            nurse = DaoFactory.getInstance().createNurseDAO().read(nurseId);
+        }
+        return new User(
+                id,
+                result.getString(1),
+                result.getBytes(2),
+                result.getBytes(3),
+                result.getInt(4),
+                nurse
+        );
+    }
+
+    @Override
+    public void create(User user) throws SQLException {
+        connection.setAutoCommit(false); //Switch to Manual Commit, to do an SQL Transaction
+        final String userSQL = """
+                    INSERT INTO user
+                    (username, passwordSalt, passwordHash)
+                    VALUES (?, ?, ?);
+                """;
+        PreparedStatement statement = this.connection.prepareStatement(userSQL);
+        statement.setString(1, user.getUsername());
+        statement.setBytes(2, user.getPasswordSalt());
+        statement.setBytes(3, user.getPasswordHash());
+        statement.execute();
+
+        ResultSet generatedKeys = connection.createStatement().executeQuery("SELECT last_insert_rowid()");
+        connection.commit(); //Finish SQL Transaction
+        connection.setAutoCommit(true); //Switch back Mode
+
+        if (!generatedKeys.next()) {
+            return;
+        }
+        int newId = generatedKeys.getInt(1);
+
+        final String permissionSQL = """
+                    INSERT INTO user__permissions
+                    (userId, permissions)
+                    VALUES (?, ?);
+                """;
+        PreparedStatement permissionStatement = this.connection.prepareStatement(permissionSQL);
+        permissionStatement.setInt(1, newId);
+        permissionStatement.setInt(2, user.getPermissions());
+        permissionStatement.execute();
+
+        if (user.getNurse() == null) {
+            return;
+        }
+        final String nurseSQL = """
+                    INSERT INTO user__nurse
+                    (userId, nurseId)
+                    VALUES (?, ?);
+                """;
+        PreparedStatement nurseStatement = this.connection.prepareStatement(nurseSQL);
+        nurseStatement.setInt(1, newId);
+        nurseStatement.setInt(2, user.getNurse().getId());
+        nurseStatement.execute();
+    }
+
+    @Override
+    public void update(User user) throws SQLException {
+        final String userSQL = """
+                    UPDATE user SET
+                    username = ?,
+                    passwordSalt = ?,
+                    passwordHash = ?
+                    WHERE id = ?
+                """;
+        PreparedStatement statement = this.connection.prepareStatement(userSQL);
+        statement.setString(1, user.getUsername());
+        statement.setBytes(2, user.getPasswordSalt());
+        statement.setBytes(3, user.getPasswordHash());
+        statement.setInt(3, user.getId());
+        statement.executeUpdate();
+
+        final String permissionSQL = """
+                    UPDATE user__permissions SET
+                    permissions = ?
+                    WHERE userId = ?
+                """;
+        PreparedStatement permissionStatement = this.connection.prepareStatement(permissionSQL);
+        permissionStatement.setInt(1, user.getPermissions());
+        permissionStatement.setInt(2, user.getId());
+        permissionStatement.executeUpdate();
+
+        if (user.getNurse() == null) {
+            final String nurseSQL = """
+                        DELETE FROM user__nurse WHERE userId = ?
+                    """;
+            this.connection.prepareStatement(nurseSQL).executeUpdate();
+            return;
+        }
+
+        final String nurseSQL = """
+                    UPDATE user__nurse set
+                    nurseId = ?
+                    WHERE userId = ?
+                """;
+        PreparedStatement nurseStatement = this.connection.prepareStatement(nurseSQL);
+        nurseStatement.setInt(1, user.getNurse().getId());
+        nurseStatement.setInt(2, user.getId());
+        permissionStatement.executeUpdate();
+    }
+
+    @Override
+    public void delete(int id) throws SQLException {
+        final String SQL = """
+                    DELETE FROM user WHERE user.id = ?;
+                """;
+        PreparedStatement preparedStatement = this.connection.prepareStatement(SQL);
+        preparedStatement.setInt(1, id);
+        preparedStatement.executeUpdate();
+    }
+
+    @Override
+    public List<User> readAll() throws SQLException {
+        final String SQL = """
+                        SELECT
+                        user.id,
+                        user.username,
+                        user.passwordSalt,
+                        user.passwordHash,
+                        user__permissions.permissions,
+                        user__nurse.nurseId
+                        FROM user
+                        LEFT JOIN user__permissions ON user.id = user__permissions.userId
+                        LEFT JOIN user__nurse ON user.id = user__nurse.userId
+                """;
+        ResultSet result = connection.prepareStatement(SQL).executeQuery();
+
+        List<User> users = new ArrayList<>();
+        while (result.next()) {
+            int nurseId = result.getInt(6);
+            Nurse nurse = null;
+            if (!result.wasNull()) {
+                nurse = DaoFactory.getInstance().createNurseDAO().read(nurseId);
+            }
+            users.add(new User(
+                    result.getInt(1),
+                    result.getString(2),
+                    result.getBytes(3),
+                    result.getBytes(4),
+                    result.getInt(5),
+                    nurse
+            ));
+        }
+        return users;
+    }
+}

src/main/java/de/hitec/nhplus/main/MainWindowController.java

@@ -1,224 +1,98 @@
 package de.hitec.nhplus.main;
 
-import de.hitec.nhplus.Main;
-import de.hitec.nhplus.nurse.Nurse;
+import de.hitec.nhplus.login.Permissions;
+import de.hitec.nhplus.login.User;
+import de.hitec.nhplus.utils.tab.TabManager;
+import de.hitec.nhplus.utils.tab.TabStruct;
+import javafx.event.Event;
 import javafx.fxml.FXML;
-import javafx.fxml.FXMLLoader;
-import javafx.scene.control.SelectionModel;
 import javafx.scene.control.Tab;
 import javafx.scene.control.TabPane;
-import javafx.scene.layout.AnchorPane;
-import javafx.scene.layout.BorderPane;
-import de.hitec.nhplus.treatment.Treatment;
-import de.hitec.nhplus.medication.Medication;
-import de.hitec.nhplus.patient.Patient;
 
-import java.io.IOException;
-import java.util.Objects;
+import java.util.List;
 
 /**
  * Controller for the main window of the application, which holds all tabs.
  *
- * @author Bernd Heidemann
  * @author Dominik Säume
- * @author Armin Ribic
- * @author Dorian Nemec
  */
 public class MainWindowController {
+    private static MainWindowController instace;
     @FXML
-    private TabPane mainTabPane;
-    @FXML
-    private AnchorPane patientPage;
-    @FXML
-    private Tab patientTab;
-    @FXML
-    private AnchorPane activeTreatmentPage;
-    @FXML
-    private Tab treatmentTab;
-    @FXML
-    private TabPane treatmentTabPane;
-    @FXML
-    private Tab activeTreatmentTab;
-    @FXML
-    private AnchorPane lockedTreatmentPage;
-    @FXML
-    private Tab lockedTreatmentTab;
-    @FXML
-    private Tab nurseTab;
-    @FXML
-    private TabPane nurseTabPane;
-    @FXML
-    private AnchorPane activeNursePage;
-    @FXML
-    private Tab activeNurseTab;
-    @FXML
-    private AnchorPane lockedNursePage;
-    @FXML
-    private Tab lockedNurseTab;
-    @FXML
-    private AnchorPane medicationPage;
-    @FXML
-    private Tab medicationTab;
-
-    /**
-     * Initialization method that is called after the binding of all the fields.
-     */
-    @FXML
-    public void initialize() {
-        loadPatientPage();
-        mainTabPane.getSelectionModel().select(patientTab);
-
-        patientTab.setOnSelectionChanged(event -> loadPatientPage());
-        medicationTab.setOnSelectionChanged(event -> loadMedicationPage());
-
-
-        nurseTab.setOnSelectionChanged(event -> loadNursePage());
-        nurseTabPane.getSelectionModel().select(activeNurseTab);
-
-        activeNurseTab.setOnSelectionChanged(event -> loadActiveNursePage());
-        lockedNurseTab.setOnSelectionChanged(event -> loadLockedNursePage());
-
-        treatmentTab.setOnSelectionChanged(event -> loadTreatmentPage());
-        treatmentTabPane.getSelectionModel().select(activeTreatmentTab);
-
-        activeTreatmentTab.setOnSelectionChanged(event -> loadActiveTreatmentPage());
-        lockedTreatmentTab.setOnSelectionChanged(event -> loadLockedTreatmentPage());
+    public TabPane mainTabPane;
+    private User user;
+    private TabManager tabManager;
 
+    public MainWindowController() {
+        instace = this;
     }
 
     /**
-     * Loads the {@link Patient} page into its tab.
+     * Method copying the idea of a singleton, to allow getting the current {@link User}.
      */
-    private void loadPatientPage() {
-        try {
-            BorderPane patientsPane = FXMLLoader.load(
-                    Objects.requireNonNull(Main.class.getResource("/de/hitec/nhplus/patient/AllPatientView.fxml"))
-            );
-            patientPage.getChildren().setAll(patientsPane);
-            AnchorPane.setTopAnchor(patientsPane, 0d);
-            AnchorPane.setBottomAnchor(patientsPane, 0d);
-            AnchorPane.setLeftAnchor(patientsPane, 0d);
-            AnchorPane.setRightAnchor(patientsPane, 0d);
-        } catch (IOException exception) {
-            exception.printStackTrace();
-        }
+    public static MainWindowController getInstance() {
+        return instace;
     }
 
     /**
-     * Loads the {@link Treatment } tab.
+     * JavaFX Initialization method that is called after the binding of all the fields.
+     *
+     * @param user The logged in {@link User}.
      */
-    private void loadTreatmentPage() {
-        SelectionModel<Tab> selectionModel = treatmentTabPane.getSelectionModel();
-        Tab selectedTab = selectionModel.getSelectedItem();
-        if (selectedTab == activeTreatmentTab) {
-            loadActiveTreatmentPage();
-        }
-        if (selectedTab == lockedTreatmentTab) {
-            loadLockedTreatmentPage();
-        }
+    @FXML
+    public void initialize(User user) {
+        instace = this;
+        this.user = user;
+        this.tabManager = new TabManager(user);
+        setupTabs();
     }
 
     /**
-     * Loads the active {@link Treatment} page into its tab.
+     * Sets up all Tabs Accessible, with help of the {@link TabManager}.
      */
-    private void loadActiveTreatmentPage() {
-        try {
-            BorderPane activeTreatmentPane = FXMLLoader.load(
-                    Objects.requireNonNull(Main.class.getResource("/de/hitec/nhplus/treatment/AllTreatmentView.fxml"))
-            );
-            activeTreatmentPage.getChildren().setAll(activeTreatmentPane);
-            AnchorPane.setTopAnchor(activeTreatmentPane, 0d);
-            AnchorPane.setBottomAnchor(activeTreatmentPane, 0d);
-            AnchorPane.setLeftAnchor(activeTreatmentPane, 0d);
-            AnchorPane.setRightAnchor(activeTreatmentPane, 0d);
-        } catch (IOException exception) {
-            exception.printStackTrace();
-        }
+    private void setupTabs() {
+        tabManager.setupTab(mainTabPane, new TabStruct(
+                "Patienten",
+                "/de/hitec/nhplus/patient/AllPatientView.fxml",
+                Permissions.NURSE
+        ));
+        tabManager.setupSubTabPane(mainTabPane, "Behandlungen", Permissions.NURSE, List.of(
+                new TabStruct(
+                        "Behandlungen",
+                        "/de/hitec/nhplus/treatment/AllTreatmentView.fxml",
+                        Permissions.NURSE
+                ),
+                new TabStruct(
+                        "Gesperrte Behandlungen",
+                        "/de/hitec/nhplus/treatment/LockedTreatmentView.fxml",
+                        Permissions.NURSE
+                )
+        ));
+        tabManager.setupSubTabPane(mainTabPane, "Pfleger", Permissions.EVERYBODY, List.of(
+                new TabStruct(
+                        "Pfleger",
+                        "/de/hitec/nhplus/nurse/AllNurseView.fxml",
+                        Permissions.NURSE | Permissions.MANAGEMENT | Permissions.OWNER
+                ),
+                new TabStruct(
+                        "Gesperrte Pfleger",
+                        "/de/hitec/nhplus/nurse/LockedNurseView.fxml",
+                        Permissions.MANAGEMENT | Permissions.OWNER
+                )
+        ));
+        tabManager.setupTab(mainTabPane, new TabStruct(
+                "Medikamente",
+                "/de/hitec/nhplus/medication/AllMedicationView.fxml",
+                Permissions.MANAGEMENT
+        ));
+
+
+        Tab defaultTab = mainTabPane.getTabs().get(0);
+        mainTabPane.getSelectionModel().select(defaultTab);
+        defaultTab.getOnSelectionChanged().handle(new Event(Event.ANY));
     }
 
-    /**
-     * Loads the locked {@link Treatment} page into its tab.
-     */
-    private void loadLockedTreatmentPage() {
-        try {
-            BorderPane treatmentsPane = FXMLLoader.load(
-                  Objects.requireNonNull(Main.class.getResource("/de/hitec/nhplus/treatment/LockedTreatmentView.fxml"))
-            );
-            lockedTreatmentPage.getChildren().setAll(treatmentsPane);
-            AnchorPane.setTopAnchor(treatmentsPane, 0d);
-            AnchorPane.setBottomAnchor(treatmentsPane, 0d);
-            AnchorPane.setLeftAnchor(treatmentsPane, 0d);
-            AnchorPane.setRightAnchor(treatmentsPane, 0d);
-        } catch (IOException exception) {
-            exception.printStackTrace();
-        }
-    }
-
-    /**
-     * Loads the {@link Nurse} page into its tab.
-     */
-    private void loadNursePage() {
-        SelectionModel<Tab> selectionModel = nurseTabPane.getSelectionModel();
-        Tab selectedTab = selectionModel.getSelectedItem();
-        if (selectedTab == activeNurseTab) {
-            loadActiveNursePage();
-        }
-        if (selectedTab == lockedNurseTab) {
-            loadLockedNursePage();
-        }
-    }
-
-    /**
-     * Loads the active {@link Nurse} page into its tab.
-     */
-    private void loadActiveNursePage() {
-        try {
-            BorderPane activeNursePane = FXMLLoader.load(
-                    Objects.requireNonNull(Main.class.getResource("/de/hitec/nhplus/nurse/AllNurseView.fxml"))
-            );
-            activeNursePage.getChildren().setAll(activeNursePane);
-            AnchorPane.setTopAnchor(activeNursePane, 0d);
-            AnchorPane.setBottomAnchor(activeNursePane, 0d);
-            AnchorPane.setLeftAnchor(activeNursePane, 0d);
-            AnchorPane.setRightAnchor(activeNursePane, 0d);
-        } catch (IOException exception) {
-            exception.printStackTrace();
-        }
-    }
-
-    /**
-     * Loads the locked {@link Nurse} page into its tab.
-     */
-    private void loadLockedNursePage() {
-        try {
-            BorderPane lockedNursePane = FXMLLoader.load(
-                    Objects.requireNonNull(Main.class.getResource("/de/hitec/nhplus/nurse/LockedNurseView.fxml"))
-            );
-            lockedNursePage.getChildren().setAll(lockedNursePane);
-            AnchorPane.setTopAnchor(lockedNursePane, 0d);
-            AnchorPane.setBottomAnchor(lockedNursePane, 0d);
-            AnchorPane.setLeftAnchor(lockedNursePane, 0d);
-            AnchorPane.setRightAnchor(lockedNursePane, 0d);
-        } catch (IOException exception) {
-            exception.printStackTrace();
-        }
-    }
-
-    /**
-     * Loads the {@link Medication} page into its tab.
-     */
-    private void loadMedicationPage() {
-        try {
-            BorderPane medicationPane = FXMLLoader.load(
-                    Objects.requireNonNull(Main.class.getResource("/de/hitec/nhplus/medication/AllMedicationView.fxml"))
-            );
-            medicationPage.getChildren().setAll(medicationPane);
-            AnchorPane.setTopAnchor(medicationPane, 0d);
-            AnchorPane.setBottomAnchor(medicationPane, 0d);
-            AnchorPane.setLeftAnchor(medicationPane, 0d);
-            AnchorPane.setRightAnchor(medicationPane, 0d);
-        } catch (IOException exception) {
-            exception.printStackTrace();
-        }
+    public User getUser() {
+        return user;
     }
 }

src/main/java/de/hitec/nhplus/nurse/AllNurseController.java

@@ -1,8 +1,8 @@
 package de.hitec.nhplus.nurse;
 
-import static de.hitec.nhplus.utils.Validator.*;
-
 import de.hitec.nhplus.datastorage.DaoFactory;
+import de.hitec.nhplus.login.Permissions;
+import de.hitec.nhplus.main.MainWindowController;
 import de.hitec.nhplus.nurse.database.NurseDao;
 import javafx.beans.value.ChangeListener;
 import javafx.collections.FXCollections;
@@ -17,6 +17,8 @@ import javafx.scene.control.cell.TextFieldTableCell;
 
 import java.sql.SQLException;
 
+import static de.hitec.nhplus.utils.Validator.*;
+
 /**
  * The controller for viewing all {@link Nurse}s.
  *
@@ -49,12 +51,17 @@ public class AllNurseController {
 
     private final ObservableList<Nurse> nurses = FXCollections.observableArrayList();
     private NurseDao dao;
+    private boolean hasEditPermissions;
 
     /**
      * Initialization method that is called after the binding of all the fields.
      */
     @FXML
     public void initialize() {
+        int editPermissions = Permissions.MANAGEMENT | Permissions.OWNER;
+        int userPermissions = MainWindowController.getInstance().getUser().getPermissions();
+        hasEditPermissions = (userPermissions & editPermissions) != 0;
+
         this.readAllAndShowInTableView();
 
         this.columnId.setCellValueFactory(new PropertyValueFactory<>("id"));
@@ -71,12 +78,18 @@ public class AllNurseController {
 
         this.tableView.setItems(this.nurses);
 
+
         this.buttonAdd.setDisable(true);
-        ChangeListener<String> inputNewNurseValidationListener = (observableValue, oldText, newText)->
+        if (!hasEditPermissions) {
+            this.buttonLock.setDisable(true);
+            return;
+        }
+
+        ChangeListener<String> inputNewNurseValidationListener = (observableValue, oldText, newText) ->
         {
             boolean isValid = isValidFirstName(this.textFieldFirstName.getText())
-                && isValidSurName(this.textFieldSurName.getText())
-                && isValidPhoneNumber(this.textFieldPhoneNumber.getText());
+                              && isValidSurName(this.textFieldSurName.getText())
+                              && isValidPhoneNumber(this.textFieldPhoneNumber.getText());
 
             AllNurseController.this.buttonAdd.setDisable(!isValid);
         };
@@ -89,12 +102,12 @@ public class AllNurseController {
     /**
      * Internal method to read all data and set it to the table view.
      */
-    private void readAllAndShowInTableView(){
+    private void readAllAndShowInTableView() {
         this.nurses.clear();
         this.dao = DaoFactory.getInstance().createNurseDAO();
         try {
             this.nurses.setAll(this.dao.readAllActive());
-        }catch (SQLException exception){
+        } catch (SQLException exception) {
             exception.printStackTrace();
         }
     }
@@ -120,14 +133,13 @@ public class AllNurseController {
     }
 
     @FXML
-    public void handleAdd(){
-        String surname=this.textFieldSurName.getText();
-        String firstName=this.textFieldFirstName.getText();
-        String phoneNumber=this.textFieldPhoneNumber.getText();
+    public void handleAdd() {
+        String surname = this.textFieldSurName.getText();
+        String firstName = this.textFieldFirstName.getText();
+        String phoneNumber = this.textFieldPhoneNumber.getText();
         try {
             this.dao.create(new Nurse(firstName, surname, phoneNumber));
-        }
-        catch (SQLException exception){
+        } catch (SQLException exception) {
             exception.printStackTrace();
         }
         readAllAndShowInTableView();
@@ -135,16 +147,16 @@ public class AllNurseController {
     }
 
     @FXML
-    public void handleLock(){
+    public void handleLock() {
         Nurse selectedItem = this.tableView.getSelectionModel().getSelectedItem();
-        if (selectedItem == null){
+        if (selectedItem == null) {
             return;
         }
 
         try {
             selectedItem.setLocked(true);
             this.dao.update(selectedItem);
-        }catch (SQLException exception){
+        } catch (SQLException exception) {
             exception.printStackTrace();
         }
         readAllAndShowInTableView();
@@ -152,6 +164,10 @@ public class AllNurseController {
 
     @FXML
     public void handleOnEditSurname(TableColumn.CellEditEvent<Nurse, String> event) {
+        if(!hasEditPermissions){
+            event.getTableView().refresh();
+            return;
+        }
         String newSurName = event.getNewValue();
         if (!isValidSurName(newSurName)) {
             showValidationError("Nachname");
@@ -164,6 +180,10 @@ public class AllNurseController {
 
     @FXML
     public void handleOnEditFirstname(TableColumn.CellEditEvent<Nurse, String> event) {
+        if(!hasEditPermissions){
+            event.getTableView().refresh();
+            return;
+        }
         String newFirstName = event.getNewValue();
         if (!isValidFirstName(newFirstName)) {
             showValidationError("Vorname");
@@ -176,6 +196,10 @@ public class AllNurseController {
 
     @FXML
     public void handleOnEditPhoneNumber(TableColumn.CellEditEvent<Nurse, String> event) {
+        if(!hasEditPermissions){
+            event.getTableView().refresh();
+            return;
+        }
         String newPhoneNumber = event.getNewValue();
         if (!isValidPhoneNumber(newPhoneNumber)) {
             showValidationError("Telefonnummer");

src/main/java/de/hitec/nhplus/nurse/Nurse.java

@@ -44,7 +44,7 @@ public class Nurse extends Person {
 
     /**
      * This constructor allows instantiating a {@link Nurse} object with
-     * specifying if the nurse is locked or not.
+     * specifying whether the {@link Nurse} is locked or not.
      */
     public Nurse(
             String firstName,

src/main/java/de/hitec/nhplus/utils/tab/TabManager.java

@@ -0,0 +1,114 @@
+package de.hitec.nhplus.utils.tab;
+
+import de.hitec.nhplus.Main;
+import de.hitec.nhplus.login.Permissions;
+import de.hitec.nhplus.login.User;
+import javafx.event.Event;
+import javafx.event.EventHandler;
+import javafx.fxml.FXMLLoader;
+import javafx.scene.control.Tab;
+import javafx.scene.control.TabPane;
+import javafx.scene.layout.AnchorPane;
+import javafx.scene.layout.BorderPane;
+
+import java.io.IOException;
+import java.util.List;
+import java.util.Objects;
+
+/**
+ * A utility class to construct {@link Tab}s from views. This also supports sub {@link Tab}s.
+ *
+ * @author Dominiok Säume
+ * @see TabManager
+ */
+public class TabManager {
+    private final User user;
+
+    public TabManager(User user) {
+        this.user = user;
+    }
+
+    /**
+     * Internal method to check permissions
+     * @param requiredPermissions The permissions the {@link User} requires.
+     * @param permissions The permissions the {@link User} has.
+     */
+    private boolean hasPermissions(int requiredPermissions, int permissions) {
+        return requiredPermissions == Permissions.EVERYBODY
+               || (permissions & requiredPermissions) != 0;
+    }
+
+    /**
+     * Method to set up a single tab and register it to its {@link TabPane}.
+     * @param tabPane The {@link TabPane} to register to.
+     * @param tabStruct The data needed to construct the new tab.
+     */
+    public void setupTab(TabPane tabPane, TabStruct tabStruct) {
+        if (!hasPermissions(tabStruct.requiredPermissions, user.getPermissions())) {
+            return;
+        }
+        Tab tab = new Tab();
+        tab.setText(tabStruct.title);
+        AnchorPane pane = new AnchorPane();
+        tab.setContent(pane);
+        tab.setOnSelectionChanged(loadTabEventHandler(tabStruct, pane));
+        tabPane.getTabs().add(tab);
+    }
+
+    /**
+     * {@link EventHandler} to handle the loading of a {@link Tab}.
+     * @param tabStruct The {@link TabStruct} holding the path of the view.
+     * @param pane The main pane of the {@link Tab}.
+     */
+    private EventHandler<Event> loadTabEventHandler(TabStruct tabStruct, AnchorPane pane) {
+        return event -> {
+            try {
+                BorderPane patientsPane = FXMLLoader.load(
+                        Objects.requireNonNull(Main.class.getResource(tabStruct.view))
+                );
+                pane.getChildren().setAll(patientsPane);
+                AnchorPane.setTopAnchor(patientsPane, 0d);
+                AnchorPane.setBottomAnchor(patientsPane, 0d);
+                AnchorPane.setLeftAnchor(patientsPane, 0d);
+                AnchorPane.setRightAnchor(patientsPane, 0d);
+            } catch (IOException exception) {
+                exception.printStackTrace();
+            }
+        };
+    }
+
+    /**
+     * Method to set up a sub tab and register it to its parent {@link TabPane}.
+     * @param parentTabPane The {@link TabPane} to register to.
+     * @param title The title of the {@link Tab}.
+     * @param requiredPermissions The permissions required to see the sub {@link Tab}.
+     * @param subTabs A {@link List} of {@link TabStruct}s to create in the sub {@link Tab}.
+     */
+    public void setupSubTabPane(TabPane parentTabPane, String title, int requiredPermissions, List<TabStruct> subTabs) {
+        if (!hasPermissions(requiredPermissions, user.getPermissions())) {
+            return;
+        }
+        Tab tab = new Tab();
+        tab.setText(title);
+        TabPane subTabPane = new TabPane();
+        subTabPane.setTabClosingPolicy(TabPane.TabClosingPolicy.UNAVAILABLE);
+        tab.setContent(subTabPane);
+        subTabs.forEach(tabStruct -> setupTab(subTabPane, tabStruct));
+        if (subTabPane.getTabs().isEmpty()) {
+            return;
+        }
+        tab.setOnSelectionChanged(loadSubTabPaneEventHandler(subTabPane));
+        parentTabPane.getTabs().add(tab);
+    }
+
+    /**
+     * {@link EventHandler} to handle the loading of a sub {@link TabPane}.
+     * @param tabPane The {@link TabPane} of the sub {@link Tab} to handle loading.
+     */
+    private EventHandler<Event> loadSubTabPaneEventHandler(TabPane tabPane) {
+        return event -> {
+            Tab tab = tabPane.getSelectionModel().getSelectedItem();
+            tab.getOnSelectionChanged().handle(new Event(Event.ANY));
+        };
+    }
+}

src/main/java/de/hitec/nhplus/utils/tab/TabStruct.java

@@ -0,0 +1,19 @@
+package de.hitec.nhplus.utils.tab;
+
+/**
+ * A simple class holding the data needed for constructing a {@link javafx.scene.control.Tab Tab}.
+ *
+ * @author Dominiok Säume
+ * @see TabManager
+ */
+public class TabStruct {
+    public String title;
+    public String view;
+    public int requiredPermissions;
+
+    public TabStruct(String title, String view, int requiredPermissions) {
+        this.title = title;
+        this.view = view;
+        this.requiredPermissions = requiredPermissions;
+    }
+}

src/main/java/module-info.java

@@ -10,6 +10,9 @@ module de.hitec.nhplus {
     exports de.hitec.nhplus.main;
     opens de.hitec.nhplus.main to javafx.base, javafx.fxml;
 
+    exports de.hitec.nhplus.login;
+    opens de.hitec.nhplus.login to javafx.base, javafx.fxml;
+
     exports de.hitec.nhplus.patient;
     exports de.hitec.nhplus.patient.database;
     opens de.hitec.nhplus.patient.database to javafx.base, javafx.fxml;

src/main/resources/de/hitec/nhplus/login/LoginView.fxml

@@ -0,0 +1,47 @@
+<?xml version="1.0" encoding="UTF-8"?>
+
+<?import javafx.geometry.Insets?>
+<?import javafx.scene.control.Button?>
+<?import javafx.scene.control.Label?>
+<?import javafx.scene.control.PasswordField?>
+<?import javafx.scene.control.TextField?>
+<?import javafx.scene.layout.*?>
+<BorderPane
+        xmlns="http://javafx.com/javafx/17.0.2-ea"
+        xmlns:fx="http://javafx.com/fxml/1"
+        fx:controller="de.hitec.nhplus.login.LoginController"
+        minWidth="240"
+        maxWidth="240"
+>
+    <padding>
+        <Insets bottom="8" left="8" right="8" top="8"/>
+    </padding>
+    <top>
+        <Label text="Anmeldung" BorderPane.alignment="CENTER"/>
+    </top>
+    <center>
+        <VBox spacing="8">
+            <BorderPane.margin>
+                <Insets bottom="8.0" top="8.0"/>
+            </BorderPane.margin>
+            <TextField
+                    fx:id="textFieldUsername"
+                    promptText="nutzername"
+                    VBox.vgrow="ALWAYS"
+            />
+            <PasswordField
+                    fx:id="passwordField"
+                    promptText="password"
+                    VBox.vgrow="ALWAYS"
+            />
+        </VBox>
+    </center>
+    <bottom>
+        <Button
+                fx:id="buttonSubmit"
+                text="Bestätigen"
+                BorderPane.alignment="CENTER"
+                onAction="#handleSubmit"
+        />
+    </bottom>
+</BorderPane>

src/main/resources/de/hitec/nhplus/login/database/User.sql

@@ -0,0 +1,7 @@
+CREATE TABLE user
+(
+    id INTEGER PRIMARY KEY AUTOINCREMENT,
+    username TEXT NOT NULL UNIQUE,
+    passwordSalt BLOB NOT NULL,
+    passwordHash BLOB NOT NULL
+)

src/main/resources/de/hitec/nhplus/login/database/UserPermission.sql

@@ -0,0 +1,6 @@
+CREATE TABLE user__permissions
+(
+    userId  INTEGER NOT NULL UNIQUE,
+    permissions INTEGER NOT NULL, -- Binary Bitmask for Permissions
+    FOREIGN KEY (userId) REFERENCES user (id) ON DELETE CASCADE
+)

src/main/resources/de/hitec/nhplus/login/database/UserToNurse.sql

@@ -0,0 +1,7 @@
+CREATE TABLE user__nurse
+(
+    userId  INTEGER NOT NULL UNIQUE,
+    nurseId INTEGER NOT NULL UNIQUE,
+    FOREIGN KEY (userId) REFERENCES user (id) ON DELETE CASCADE,
+    FOREIGN KEY (nurseId) REFERENCES nurse (id) ON DELETE CASCADE
+)

src/main/resources/de/hitec/nhplus/main/MainWindowView.fxml

@@ -1,38 +1,10 @@
 <?xml version="1.0" encoding="UTF-8"?>
 
 <?import javafx.scene.control.*?>
-<?import javafx.scene.layout.AnchorPane?>
 <TabPane
         fx:id="mainTabPane"
         tabClosingPolicy="UNAVAILABLE"
         xmlns="http://javafx.com/javafx/17.0.2-ea"
         xmlns:fx="http://javafx.com/fxml/1"
         fx:controller="de.hitec.nhplus.main.MainWindowController"
->
-    <Tab fx:id="patientTab" text="Patienten">
-        <AnchorPane fx:id="patientPage"/>
-    </Tab>
-    <Tab fx:id="treatmentTab"  text="Behandlungen">
-        <TabPane fx:id="treatmentTabPane" tabClosingPolicy="UNAVAILABLE">
-            <Tab fx:id="activeTreatmentTab" text="Behandlungen">
-                <AnchorPane fx:id="activeTreatmentPage"/>
-            </Tab>
-            <Tab fx:id="lockedTreatmentTab" text="Gesperrte Behandlungen">
-                <AnchorPane fx:id="lockedTreatmentPage" />
-            </Tab>
-        </TabPane>
-    </Tab>
-    <Tab fx:id="nurseTab" text="Pfleger">
-        <TabPane fx:id="nurseTabPane" tabClosingPolicy="UNAVAILABLE">
-            <Tab fx:id="activeNurseTab" text="Pfleger">
-                <AnchorPane fx:id="activeNursePage"/>
-            </Tab>
-            <Tab fx:id="lockedNurseTab" text="Gesperrte Pfleger">
-                <AnchorPane fx:id="lockedNursePage"/>
-            </Tab>
-        </TabPane>
-    </Tab>
-    <Tab fx:id="medicationTab" text="Medikamente">
-        <AnchorPane fx:id="medicationPage"/>
-    </Tab>
-</TabPane>
+/>