StockIdValidator.php

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<?php
declare(strict_types=1);

namespace Magento\Inventory\Model\StockSourceLink\Validator;

use Magento\Framework\Validation\ValidationResult;
use Magento\Framework\Validation\ValidationResultFactory;
use Magento\InventoryApi\Api\Data\StockSourceLinkInterface;
use Magento\InventoryApi\Model\StockSourceLinkValidatorInterface;

class StockIdValidator implements StockSourceLinkValidatorInterface
{
    private $validationResultFactory;

    public function __construct(ValidationResultFactory $validationResultFactory)
    {
        $this->validationResultFactory = $validationResultFactory;
    }

    public function validate(StockSourceLinkInterface $link): ValidationResult
    {
        $value = (int)$link->getStockId();

        if (!$value) {
            $errors[] = __('"%field" can not be empty.', ['field' => StockSourceLinkInterface::STOCK_ID]);
        } else {
            $errors = [];
        }

        return $this->validationResultFactory->create(['errors' => $errors]);
    }
}