/**
     * update
     * Updates selected row in table by using text fields
     */

    @FXML
    private void update(){
        ReadableData selectedData = MainView.getSelectionModel().getSelectedItem();


        Hall hall = selectedData.getHall();
        Room room = selectedData.getRoom();
        Lease lease = selectedData.getLease();

        selectedData.setStudentNumber(studentIdBox.getText());
        selectedData.setForename(forenameBox.getText());
        selectedData.setSurname(surnameBox.getText());
        selectedData.setLeaseNumber(leaseNumberBox.getText());

        Student student = null;

        // If we are in edit mode, there is already a lease on the room
        // Otherwise if creating a new lease then we require a student instance
        if (lease == null)
        {
            student = new Student(Integer.valueOf(studentIdBox.getText()),
                    forenameBox.getText(),
                    surnameBox.getText());

        }
        else
        {
            // Retrieve the student from the existing lease
            student = lease.getStudent();
        }

        // Either way, set the student id, forename and surname
        student.setStudentID(Integer.valueOf(studentIdBox.getText()));
        student.setForename(forenameBox.getText());
        student.setSurname(surnameBox.getText());

        // If new lease, create one
        if (lease == null)
        {
            lease = new Lease(student);
            room.setLease(lease);
        }

        lease.setLeaseNumber(Integer.valueOf(leaseNumberBox.getText()));

        room.getRoomStatus();

    }