StockProcessor.php

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<?php
declare(strict_types=1);

namespace Magento\CatalogGraphQl\Model\Resolver\Products\DataProvider\Product\CollectionProcessor;

use Magento\Catalog\Model\ResourceModel\Product\Collection;
use Magento\CatalogGraphQl\Model\Resolver\Products\DataProvider\Product\CollectionProcessorInterface;
use Magento\Framework\Api\SearchCriteriaInterface;
use Magento\CatalogInventory\Api\StockConfigurationInterface;
use Magento\CatalogInventory\Model\ResourceModel\Stock\Status as StockStatusResource;

class StockProcessor implements CollectionProcessorInterface
{
    private $stockConfig;

    private $stockStatusResource;

    public function __construct(StockConfigurationInterface $stockConfig, StockStatusResource $stockStatusResource)
    {
        $this->stockConfig = $stockConfig;
        $this->stockStatusResource = $stockStatusResource;
    }

    public function process(
        Collection $collection,
        SearchCriteriaInterface $searchCriteria,
        array $attributeNames
    ): Collection {
        if (!$this->stockConfig->isShowOutOfStock()) {
            $this->stockStatusResource->addIsInStockFilterToCollection($collection);
        }

        return $collection;
    }
}