ItemRepository.php

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<?php
namespace Magento\GiftMessage\Model;

use Magento\Framework\Exception\CouldNotSaveException;
use Magento\Framework\Exception\InputException;
use Magento\Framework\Exception\State\InvalidTransitionException;
use Magento\Framework\Exception\NoSuchEntityException;

class ItemRepository implements \Magento\GiftMessage\Api\ItemRepositoryInterface
{
    protected $quoteRepository;

    protected $storeManager;

    protected $giftMessageManager;

    protected $helper;

    protected $messageFactory;

    public function __construct(
        \Magento\Quote\Api\CartRepositoryInterface $quoteRepository,
        \Magento\Store\Model\StoreManagerInterface $storeManager,
        \Magento\GiftMessage\Model\GiftMessageManager $giftMessageManager,
        \Magento\GiftMessage\Helper\Message $helper,
        \Magento\GiftMessage\Model\MessageFactory $messageFactory
    ) {
        $this->quoteRepository = $quoteRepository;
        $this->giftMessageManager = $giftMessageManager;
        $this->storeManager = $storeManager;
        $this->helper = $helper;
        $this->messageFactory = $messageFactory;
    }

    public function get($cartId, $itemId)
    {
        $quote = $this->quoteRepository->getActive($cartId);
        if (!$item = $quote->getItemById($itemId)) {
            throw new NoSuchEntityException(
                __('No item with the provided ID was found in the Cart. Verify the ID and try again.')
            );
        };
        $messageId = $item->getGiftMessageId();
        if (!$messageId) {
            return null;
        }

        return $this->messageFactory->create()->load($messageId);
    }

    public function save($cartId, \Magento\GiftMessage\Api\Data\MessageInterface $giftMessage, $itemId)
    {
        $quote = $this->quoteRepository->getActive($cartId);

        if (!$item = $quote->getItemById($itemId)) {
            throw new NoSuchEntityException(
                __(
                    'No product with the "%1" itemId exists in the Cart. Verify your information and try again.',
                    $itemId
                )
            );
        };

        if ($item->getIsVirtual()) {
            throw new InvalidTransitionException(__('Gift messages can\'t be used for virtual products.'));
        }
        $messageText = $giftMessage->getMessage();
        if ($messageText && !$this->helper->isMessagesAllowed('items', $quote, $this->storeManager->getStore())) {
            throw new CouldNotSaveException(__("The gift message isn't available."));
        }
        $this->giftMessageManager->setMessage($quote, 'quote_item', $giftMessage, $itemId);
        return true;
    }
}