owncloud / core

	 * @throws \InvalidArgumentException if the subject or parameters are invalid

	 * @since 8.2.0

	 */

	public function setSubject($subject, array $parameters = []) {

		if (!is_string($subject) || $subject === '' || isset($subject[64])) {

			throw new \InvalidArgumentException('The given subject is invalid');

		}

		$this->subject = $subject;

		if (!is_array($parameters)) {

			throw new \InvalidArgumentException('The given subject parameters are invalid');

		}

		$this->subjectParameters = $parameters;

		return $this;

	}

	/**

	 * @return string

	 * @throws \InvalidArgumentException if the message or parameters are invalid

	 * @since 8.2.0

	 */

	public function setMessage($message, array $parameters = []) {

		if (!is_string($message) || $message === '' || isset($message[64])) {

			throw new \InvalidArgumentException('The given message is invalid');

		}

		$this->message = $message;

		if (!is_array($parameters)) {

			throw new \InvalidArgumentException('The given message parameters are invalid');

		}

		$this->messageParameters = $parameters;

		return $this;

	}

	/**

	 * @return string