Dumplie\CustomerService\Domain\Exception\InvalidTransitionException::finalState PHP Метод

    public static function finalState(string $state) : InvalidTransitionException
    {
        return new static(sprintf('Can not transit from final state "%s"', $state));
    }

 /**
  * @throws InvalidTransitionException
  */
 public function send() : OrderState
 {
     throw InvalidTransitionException::finalState('rejected');
 }