DatabaseUniqueUidNewRow.php

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<?php
namespace TYPO3\CMS\Backend\Form\FormDataProvider;

/*
 * This file is part of the TYPO3 CMS project.
 *
 * It is free software; you can redistribute it and/or modify it under
 * the terms of the GNU General Public License, either version 2
 * of the License, or any later version.
 *
 * For the full copyright and license information, please read the
 * LICENSE.txt file that was distributed with this source code.
 *
 * The TYPO3 project - inspiring people to share!
 */

use TYPO3\CMS\Backend\Form\FormDataProviderInterface;
use TYPO3\CMS\Core\Utility\StringUtility;

class DatabaseUniqueUidNewRow implements FormDataProviderInterface
{
    public function addData(array $result)
    {
        if ($result['command'] !== 'new') {
            return $result;
        }
        // Throw exception if uid is already set
        if (isset($result['databaseRow']['uid'])) {
            throw new \InvalidArgumentException(
                'uid is already set to ' . $result['databaseRow']['uid'],
                1437991120
            );
        }
        $result['databaseRow']['uid'] = StringUtility::getUniqueId('NEW');

        return $result;
    }
}