CartTotalManagement.php

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

use Magento\Quote\Api\CartTotalManagementInterface;

class CartTotalManagement implements CartTotalManagementInterface
{
    protected $shippingMethodManagement;

    protected $paymentMethodManagement;

    protected $cartTotalsRepository;

    protected $dataProcessor;

    public function __construct(
        \Magento\Quote\Api\ShippingMethodManagementInterface $shippingMethodManagement,
        \Magento\Quote\Api\PaymentMethodManagementInterface $paymentMethodManagement,
        \Magento\Quote\Api\CartTotalRepositoryInterface $cartTotalsRepository,
        \Magento\Quote\Model\Cart\TotalsAdditionalDataProcessor $dataProcessor
    ) {
        $this->shippingMethodManagement = $shippingMethodManagement;
        $this->paymentMethodManagement = $paymentMethodManagement;
        $this->cartTotalsRepository = $cartTotalsRepository;
        $this->dataProcessor = $dataProcessor;
    }

    public function collectTotals(
        $cartId,
        \Magento\Quote\Api\Data\PaymentInterface $paymentMethod,
        $shippingCarrierCode = null,
        $shippingMethodCode = null,
        \Magento\Quote\Api\Data\TotalsAdditionalDataInterface $additionalData = null
    ) {
        if ($shippingCarrierCode && $shippingMethodCode) {
            $this->shippingMethodManagement->set($cartId, $shippingCarrierCode, $shippingMethodCode);
        }
        $this->paymentMethodManagement->set($cartId, $paymentMethod);
        if ($additionalData !== null) {
            $this->dataProcessor->process($additionalData, $cartId);
        }
        return $this->cartTotalsRepository->get($cartId);
    }
}