EmptyValidator.php

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<?php
declare(strict_types = 1);
namespace TYPO3\CMS\Form\Mvc\Validation;

/*
 * 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\Extbase\Validation\Validator\AbstractValidator;

class EmptyValidator extends AbstractValidator
{
    protected $acceptsEmptyValues = true;

    public function isValid($value)
    {
        if (!empty($value)) {
            $this->addError(
                $this->translateErrorMessage(
                    'validation.error.1476396435',
                    'form'
                ),
                1476396435
            );
        }
    }
}