newsupernova/vendor/magento/module-inventory-sales/Model/CheckItemsQuantity.php

<?php
/**
 * Copyright © Magento, Inc. All rights reserved.
 * See COPYING.txt for license details.
 */
declare(strict_types=1);

namespace Magento\InventorySales\Model;

use Magento\Framework\Exception\LocalizedException;
use Magento\InventorySalesApi\Api\IsProductSalableForRequestedQtyInterface;
use Magento\InventorySalesApi\Api\Data\ProductSalableResultInterface;
use Magento\InventorySalesApi\Api\Data\ProductSalabilityErrorInterface;

class CheckItemsQuantity
{
    /**
     * @var IsProductSalableForRequestedQtyInterface
     */
    private $isProductSalableForRequestedQty;

    /**
     * @param IsProductSalableForRequestedQtyInterface $isProductSalableForRequestedQty
     */
    public function __construct(
        IsProductSalableForRequestedQtyInterface $isProductSalableForRequestedQty
    ) {
        $this->isProductSalableForRequestedQty = $isProductSalableForRequestedQty;
    }

    /**
     * Check whether all items salable
     *
     * @param array $items [['sku' => 'qty'], ...]
     * @param int $stockId
     * @return void
     * @throws LocalizedException
     */
    public function execute(array $items, int $stockId) : void
    {
        foreach ($items as $sku => $qty) {
            /** @var ProductSalableResultInterface $isSalable */
            $isSalable = $this->isProductSalableForRequestedQty->execute((string)$sku, $stockId, (float)$qty);
            if (false === $isSalable->isSalable()) {
                $errors = $isSalable->getErrors();
                /** @var ProductSalabilityErrorInterface $errorMessage */
                $errorMessage = array_pop($errors);
                throw new LocalizedException(__($errorMessage->getMessage()));
            }
        }
    }
}