StockItemValidator.php

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<?php
namespace Magento\CatalogInventory\Model;

use Magento\Catalog\Api\Data\ProductInterface;
use Magento\CatalogInventory\Api\Data\StockItemInterface;
use Magento\CatalogInventory\Api\StockConfigurationInterface;
use Magento\CatalogInventory\Api\StockRegistryInterface;
use Magento\Framework\Exception\LocalizedException;

class StockItemValidator
{
    private $stockConfiguration;

    private $stockRegistry;

    public function __construct(
        StockConfigurationInterface $stockConfiguration,
        StockRegistryInterface $stockRegistry
    ) {
        $this->stockConfiguration = $stockConfiguration;
        $this->stockRegistry = $stockRegistry;
    }

    public function validate(ProductInterface $product, StockItemInterface $stockItem)
    {
        $defaultScopeId = $this->stockConfiguration->getDefaultScopeId();
        $defaultStockId = $this->stockRegistry->getStock($defaultScopeId)->getStockId();
        $stockId = $stockItem->getStockId();
        if ($stockId !== null && $stockId != $defaultStockId) {
            throw new LocalizedException(
                __(
                    'The "%1" value is invalid for stock ID. Enter stock with a default value of %2 to try again.',
                    $stockId,
                    $defaultStockId
                )
            );
        }

        $stockItemId = $stockItem->getItemId();
        if ($stockItemId !== null && (!is_numeric($stockItemId) || $stockItemId <= 0)) {
            throw new LocalizedException(
                __(
                    'The "%1" value is invalid for stock item ID. '
                    . 'Enter either zero or a number than zero to try again.',
                    $stockItemId
                )
            );
        }

        $defaultStockItemId = $this->stockRegistry->getStockItem($product->getId())->getItemId();
        if ($defaultStockItemId && $stockItemId !== null && $defaultStockItemId != $stockItemId) {
            throw new LocalizedException(
                __(
                    'The "%1" value is invalid for stock item ID. '
                    . 'Use the stock item ID\'s assigned "%2" value and try again.',
                    $stockItemId,
                    $defaultStockItemId
                )
            );
        }
    }
}