Repository.php

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<?php
namespace Magento\Quote\Model\Quote\Item;

use Magento\Framework\App\ObjectManager;
use Magento\Framework\Exception\CouldNotSaveException;
use Magento\Framework\Exception\NoSuchEntityException;

class Repository implements \Magento\Quote\Api\CartItemRepositoryInterface
{
    protected $quoteRepository;

    protected $productRepository;

    protected $itemDataFactory;

    protected $cartItemProcessors;

    private $cartItemOptionsProcessor;

    public function __construct(
        \Magento\Quote\Api\CartRepositoryInterface $quoteRepository,
        \Magento\Catalog\Api\ProductRepositoryInterface $productRepository,
        \Magento\Quote\Api\Data\CartItemInterfaceFactory $itemDataFactory,
        array $cartItemProcessors = []
    ) {
        $this->quoteRepository = $quoteRepository;
        $this->productRepository = $productRepository;
        $this->itemDataFactory = $itemDataFactory;
        $this->cartItemProcessors = $cartItemProcessors;
    }

    public function getList($cartId)
    {
        $output = [];
        $quote = $this->quoteRepository->getActive($cartId);

        foreach ($quote->getAllVisibleItems() as $item) {
            $item = $this->getCartItemOptionsProcessor()->addProductOptions($item->getProductType(), $item);
            $output[] = $this->getCartItemOptionsProcessor()->applyCustomOptions($item);
        }
        return $output;
    }

    public function save(\Magento\Quote\Api\Data\CartItemInterface $cartItem)
    {
        $cartId = $cartItem->getQuoteId();
        $quote = $this->quoteRepository->getActive($cartId);

        $quoteItems = $quote->getItems();
        $quoteItems[] = $cartItem;
        $quote->setItems($quoteItems);
        $this->quoteRepository->save($quote);
        $quote->collectTotals();
        return $quote->getLastAddedItem();
    }

    public function deleteById($cartId, $itemId)
    {
        $quote = $this->quoteRepository->getActive($cartId);
        $quoteItem = $quote->getItemById($itemId);
        if (!$quoteItem) {
            throw new NoSuchEntityException(
                __('The %1 Cart doesn\'t contain the %2 item.', $cartId, $itemId)
            );
        }
        try {
            $quote->removeItem($itemId);
            $this->quoteRepository->save($quote);
        } catch (\Exception $e) {
            throw new CouldNotSaveException(__("The item couldn't be removed from the quote."));
        }

        return true;
    }

    private function getCartItemOptionsProcessor()
    {
        if (!$this->cartItemOptionsProcessor instanceof CartItemOptionsProcessor) {
            $this->cartItemOptionsProcessor = ObjectManager::getInstance()->get(CartItemOptionsProcessor::class);
        }

        return $this->cartItemOptionsProcessor;
    }
}