public function validate(ItemHolderInterface $itemHolder, PurchaseContext $context)
    {
        $context->setFlowType($this->flowType);

        $this->calculateAll($itemHolder);

        $flowResult = new PurchaseFlowResult($itemHolder);

        foreach ($itemHolder->getItems() as $item) {
            foreach ($this->itemValidators as $itemValidator) {
                $result = $itemValidator->execute($item, $context);
                $flowResult->addProcessResult($result);
            }
        }

        $this->calculateAll($itemHolder);

        foreach ($this->itemHolderValidators as $itemHolderValidator) {
            $result = $itemHolderValidator->execute($itemHolder, $context);
            $flowResult->addProcessResult($result);
        }

        $this->calculateAll($itemHolder);

foreach ($Order->getOrderItems() as $OrderItem) {
            try {
                if ($OrderItem->getProduct() && $OrderItem->getProductClass()) {
                    $this->cartService->addProduct($OrderItem->getProductClass(), $OrderItem->getQuantity());

                    // 明細の正規化
                    $Carts = $this->cartService->getCarts();
                    foreach ($Carts as $Cart) {
                        $result = $this->purchaseFlow->validate($Cart, new PurchaseContext($Cart, $this->getUser()));
                        // 復旧不可のエラーが発生した場合は追加した明細を削除.
                        if ($result->hasError()) {
                            $this->cartService->removeProduct($OrderItem->getProductClass());
                            foreach ($result->getErrors() as $error) {
                                $errorMessages[] = $error->getMessage();
                            }
                        }
                        foreach ($result->getWarning() as $warning) {
                            $errorMessages[] = $warning->getMessage();
                        }
                    }

                    $this->cartService->save();
                }
            } catch (CartException $e) {
                log_info($e->getMessage(), [$order_no]);
                $this->addRequestError($e->getMessage());
            }
        }