QuoteManager.php

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<?php
namespace Magento\Persistent\Model;

class QuoteManager
{
    protected $persistentSession;

    protected $checkoutSession;

    protected $persistentData;

    protected $_setQuotePersistent = true;

    protected $quoteRepository;

    public function __construct(
        \Magento\Persistent\Helper\Session $persistentSession,
        \Magento\Persistent\Helper\Data $persistentData,
        \Magento\Checkout\Model\Session $checkoutSession,
        \Magento\Quote\Api\CartRepositoryInterface $quoteRepository
    ) {
        $this->persistentSession = $persistentSession;
        $this->persistentData = $persistentData;
        $this->checkoutSession = $checkoutSession;
        $this->quoteRepository = $quoteRepository;
    }

    public function setGuest($checkQuote = false)
    {
        $quote = $this->checkoutSession->getQuote();
        if ($quote && $quote->getId()) {
            if ($checkQuote && !$this->persistentData->isShoppingCartPersist() && !$quote->getIsPersistent()) {
                $this->checkoutSession->clearQuote()->clearStorage();
                return;
            }

            $quote->getPaymentsCollection()->walk('delete');
            $quote->getAddressesCollection()->walk('delete');
            $this->_setQuotePersistent = false;
            $quote->setIsActive(true)
                ->setCustomerId(null)
                ->setCustomerEmail(null)
                ->setCustomerFirstname(null)
                ->setCustomerLastname(null)
                ->setCustomerGroupId(\Magento\Customer\Api\Data\GroupInterface::NOT_LOGGED_IN_ID)
                ->setIsPersistent(false)
                ->removeAllAddresses();
            //Create guest addresses
            $quote->getShippingAddress();
            $quote->getBillingAddress();
            $quote->collectTotals();
            $this->quoteRepository->save($quote);
        }

        $this->persistentSession->getSession()->removePersistentCookie();
    }

    public function convertCustomerCartToGuest()
    {
        $quote = $this->quoteRepository->get($this->checkoutSession->getQuoteId());
        if ($quote && $quote->getId()) {
            $this->_setQuotePersistent = false;
            $quote->setIsActive(true)
                ->setCustomerId(null)
                ->setCustomerEmail(null)
                ->setCustomerFirstname(null)
                ->setCustomerLastname(null)
                ->setCustomerGroupId(\Magento\Customer\Api\Data\GroupInterface::NOT_LOGGED_IN_ID)
                ->setIsPersistent(false);
            $quote->getAddressesCollection()->walk('setCustomerAddressId', ['customerAddressId' => null]);
            $quote->getAddressesCollection()->walk('setCustomerId', ['customerId' => null]);
            $quote->getAddressesCollection()->walk('setEmail', ['email' => null]);
            $quote->collectTotals();
            $this->persistentSession->getSession()->removePersistentCookie();
            $this->quoteRepository->save($quote);
        }
    }

    public function expire()
    {
        $quote = $this->checkoutSession->setLoadInactive()->getQuote();
        if ($quote->getIsActive() && $quote->getCustomerId()) {
            $this->checkoutSession->setCustomerData(null)->clearQuote()->clearStorage();
        } else {
            $quote->setIsActive(true)
                ->setIsPersistent(false)
                ->setCustomerId(null)
                ->setCustomerGroupId(\Magento\Customer\Api\Data\GroupInterface::NOT_LOGGED_IN_ID);
        }
    }

    public function isPersistent()
    {
        return $this->_setQuotePersistent;
    }
}