@Override
    public String getColumnName(int columnIndex) {
	switch (COLUMNS.values()[columnIndex]) {
	    case ID:
		return java.util.ResourceBundle.getBundle("cz/muni/fi/pv168/autorental/gui/Bundle").getString("customers_table_id");
	    case FIRSTNAME:
		return java.util.ResourceBundle.getBundle("cz/muni/fi/pv168/autorental/gui/Bundle").getString("customers_table_firstname");
	    case LASTNAME:
		return java.util.ResourceBundle.getBundle("cz/muni/fi/pv168/autorental/gui/Bundle").getString("customers_table_lastname");
	    case BIRTH:
		return java.util.ResourceBundle.getBundle("cz/muni/fi/pv168/autorental/gui/Bundle").getString("customers_table_birth");
	    case EMAIL:
		return java.util.ResourceBundle.getBundle("cz/muni/fi/pv168/autorental/gui/Bundle").getString("customers_table_email");
	    default:
		throw new IllegalArgumentException("columnIndex");
	}
    }