QtyProcessor.php

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<?php
namespace Magento\CatalogInventory\Model\Quote\Item\QuantityValidator\Initializer;

use Magento\CatalogInventory\Model\Quote\Item\QuantityValidator\QuoteItemQtyList;
use Magento\Quote\Model\Quote\Item;

class QtyProcessor
{
    protected $quoteItemQtyList;

    protected $item;

    public function __construct(QuoteItemQtyList $quoteItemQtyList)
    {
        $this->quoteItemQtyList = $quoteItemQtyList;
    }

    public function setItem(Item $quoteItem)
    {
        $this->item = $quoteItem;
        return $this;
    }

    public function getRowQty($qty)
    {
        $rowQty = $qty;
        if ($this->item->getParentItem()) {
            $rowQty = $this->item->getParentItem()->getQty() * $qty;
        }
        return $rowQty;
    }

    public function getQtyForCheck($qty)
    {
        if (!$this->item->getParentItem()) {
            $increaseQty = $this->item->getQtyToAdd() ? $this->item->getQtyToAdd() : $qty;
            return $this->quoteItemQtyList->getQty(
                $this->item->getProduct()->getId(),
                $this->item->getId(),
                $this->item->getQuoteId(),
                $increaseQty
            );
        }
        return $this->quoteItemQtyList->getQty(
            $this->item->getProduct()->getId(),
            $this->item->getId(),
            $this->item->getQuoteId(),
            0
        );
    }
}