CartRepository.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;

class CartRepository implements \Magento\GiftMessage\Api\CartRepositoryInterface
{
    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)
    {
        $quote = $this->quoteRepository->getActive($cartId);

        $messageId = $quote->getGiftMessageId();
        if (!$messageId) {
            return null;
        }

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

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

        if (0 == $quote->getItemsCount()) {
            throw new InputException(__("Gift messages can't be used for an empty cart. Add an item and try again."));
        }

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