private function findItemBySubject(OrderInterface $order, $subject)
    {
        return $this->findTransformedItem($order, $this->itemHelper->transform($subject));
    }
private function findItemBySubject(OrderInterface $order, $subject)
    {
        return $this->findTransformedItem($order, $this->itemHelper->transform($subject));
    }
private function findItemBySubject ( OrderInterface $ order , $ subject ) { return $ this -> findTransformedItem ( $ order , $ this -> itemHelper -> transform ( $ subject ) ) ; }
Finds the order item by subject.

@param OrderInterface $order
@param object $subject
@return OrderItemInterface|null
Finds the order item by subject .