ItemResolverComposite.php

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<?php
declare(strict_types=1);

namespace Magento\Catalog\Model\Product\Configuration\Item;

use Magento\Catalog\Api\Data\ProductInterface;
use Magento\Framework\App\ObjectManager;

class ItemResolverComposite implements ItemResolverInterface
{
    private $itemResolvers = [];

    private $itemResolversInstances = [];

    public function __construct(array $itemResolvers)
    {
        $this->itemResolvers = $itemResolvers;
    }

    public function getFinalProduct(ItemInterface $item) : ProductInterface
    {
        $finalProduct = $item->getProduct();
        foreach ($this->itemResolvers as $resolver) {
            $resolvedProduct = $this->getItemResolverInstance($resolver)->getFinalProduct($item);
            if ($resolvedProduct !== $finalProduct) {
                $finalProduct = $resolvedProduct;
                break;
            }
        }
        return $finalProduct;
    }

    private function getItemResolverInstance(string $className) : ItemResolverInterface
    {
        if (!isset($this->itemResolversInstances[$className])) {
            $this->itemResolversInstances[$className] = ObjectManager::getInstance()->get($className);
        }
        return $this->itemResolversInstances[$className];
    }
}