Data.php

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<?php
namespace Magento\Multishipping\Helper;

class Data extends \Magento\Framework\App\Helper\AbstractHelper
{
    /*
     * Xml paths for multishipping checkout
     *
     **/
    const XML_PATH_CHECKOUT_MULTIPLE_AVAILABLE = 'multishipping/options/checkout_multiple';

    const XML_PATH_CHECKOUT_MULTIPLE_MAXIMUM_QUANTITY = 'multishipping/options/checkout_multiple_maximum_qty';

    protected $checkoutSession;

    public function __construct(
        \Magento\Framework\App\Helper\Context $context,
        \Magento\Checkout\Model\Session $checkoutSession
    ) {
        $this->checkoutSession = $checkoutSession;
        parent::__construct($context);
    }

    public function getQuote()
    {
        return $this->checkoutSession->getQuote();
    }

    public function getMaximumQty()
    {
        return (int)$this->scopeConfig->getValue(
            self::XML_PATH_CHECKOUT_MULTIPLE_MAXIMUM_QUANTITY,
            \Magento\Store\Model\ScopeInterface::SCOPE_STORE
        );
    }

    public function isMultishippingCheckoutAvailable()
    {
        $quote = $this->getQuote();
        $isMultiShipping = $this->scopeConfig->isSetFlag(
            self::XML_PATH_CHECKOUT_MULTIPLE_AVAILABLE,
            \Magento\Store\Model\ScopeInterface::SCOPE_STORE
        );
        if (!$quote || !$quote->hasItems()) {
            return $isMultiShipping;
        }
        return $isMultiShipping && !$quote->hasItemsWithDecimalQty() && $quote->validateMinimumAmount(
            true
        ) &&
            $quote->getItemsSummaryQty() - $quote->getItemVirtualQty() > 0 &&
            $quote->getItemsSummaryQty() <= $this->getMaximumQty();
    }
}