StockStatusCriteriaMapper.php

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<?php
namespace Magento\CatalogInventory\Model\ResourceModel\Stock\Status;

use Magento\Framework\DB\GenericMapper;

class StockStatusCriteriaMapper extends GenericMapper
{
    protected function init()
    {
        $this->initResource(\Magento\CatalogInventory\Model\ResourceModel\Stock\Status::class);
    }

    public function mapInitialCondition()
    {
        $this->getSelect()->join(
            ['cp_table' => $this->getTable('catalog_product_entity')],
            'main_table.product_id = cp_table.entity_id',
            ['sku', 'type_id']
        );
    }

    public function mapWebsiteFilter($website)
    {
        if ($website instanceof \Magento\Store\Model\Website) {
            $website = $website->getId();
        }
        $this->addFieldToFilter('main_table.website_id', $website);
    }

    public function mapProductsFilter($products)
    {
        $productIds = [];
        if (!is_array($products)) {
            $products = [$products];
        }
        foreach ($products as $product) {
            if ($product instanceof \Magento\Catalog\Model\Product) {
                $productIds[] = $product->getId();
            } else {
                $productIds[] = $product;
            }
        }
        if (empty($productIds)) {
            $productIds[] = false;
        }
        $this->addFieldToFilter('main_table.product_id', ['in' => $productIds]);
    }

    public function mapQtyFilter($qty)
    {
        $this->addFieldToFilter('main_table.qty', ['lteq' => $qty]);
    }
}