Element_OphTrOperationbooking_Operation::getNextLetter PHP Méthode

    public function getNextLetter()
    {
        if (is_null($this->getLastLetter())) {
            return self::LETTER_INVITE;
        } else {
            $lastletter = $this->getLastLetter();
            if ($lastletter == self::LETTER_INVITE) {
                return self::LETTER_REMINDER_1;
            } elseif ($lastletter == self::LETTER_REMINDER_1) {
                return self::LETTER_REMINDER_2;
            } elseif ($lastletter == self::LETTER_REMINDER_2) {
                return self::LETTER_GP;
            } elseif ($lastletter == self::LETTER_GP) {
                return self::LETTER_REMOVAL;
            }
        }
    }