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<?php declare(strict_types=1);
namespace Shopware\Core\Checkout\Cart\LineItem;
use Shopware\Core\Checkout\Cart\Price\QuantityPriceCalculator;
use Shopware\Core\Checkout\Cart\Price\Struct\QuantityPriceDefinition;
use Shopware\Core\System\SalesChannel\SalesChannelContext;
class LineItemQuantitySplitter
{
/**
* @var QuantityPriceCalculator
*/
private $quantityPriceCalculator;
public function __construct(QuantityPriceCalculator $quantityPriceCalculator)
{
$this->quantityPriceCalculator = $quantityPriceCalculator;
}
/**
* Gets a new line item with only the provided quantity amount
* along a ready-to-use calculated price.
*
* @throws \Shopware\Core\Checkout\Cart\Exception\InvalidQuantityException
* @throws \Shopware\Core\Checkout\Cart\Exception\LineItemNotStackableException
*/
public function split(LineItem $item, int $quantity, SalesChannelContext $context): LineItem
{
// clone the original line item
$tmpItem = LineItem::createFromLineItem($item);
// use calculated item price
$unitPrice = $tmpItem->getPrice()->getUnitPrice();
$taxRules = $tmpItem->getPrice()->getTaxRules();
// change the quantity to 1 single item
$tmpItem->setQuantity($quantity);
$quantityDefinition = new QuantityPriceDefinition(
$unitPrice,
$taxRules,
$context->getContext()->getCurrencyPrecision(),
$tmpItem->getQuantity(),
true
);
$price = $this->quantityPriceCalculator->calculate(
$quantityDefinition,
$context
);
$tmpItem->setPrice($price);
return $tmpItem;
}
}

vendor/shopware/core/Checkout/Cart/LineItem/LineItemQuantitySplitter.php line 9