CheapestMethodChooser.php

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<?php
namespace Magento\InstantPurchase\Model\ShippingMethodChoose;

use Magento\Customer\Model\Address;
use Magento\Quote\Api\Data\ShippingMethodInterfaceFactory;

class CheapestMethodChooser implements ShippingMethodChooserInterface
{
    private $shippingMethodFactory;

    private $carrierFinder;

    public function __construct(
        ShippingMethodInterfaceFactory $shippingMethodFactory,
        CarrierFinder $carrierFinder
    ) {
        $this->shippingMethodFactory = $shippingMethodFactory;
        $this->carrierFinder = $carrierFinder;
    }

    public function choose(Address $address)
    {
        $shippingMethod = $this->shippingMethodFactory->create()
            ->setCarrierCode(DeferredShippingMethodChooserInterface::CARRIER)
            ->setMethodCode(CheapestMethodDeferredChooser::METHOD_CODE)
            ->setMethodTitle(__('Cheapest price'))
            ->setAvailable($this->areShippingMethodsAvailable($address));
        return $shippingMethod;
    }

    private function areShippingMethodsAvailable(Address $address): bool
    {
        $carriersForAddress = $this->carrierFinder->getCarriersForCustomerAddress($address);
        return !empty($carriersForAddress);
    }
}