IntegerConverter.php

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<?php
namespace TYPO3\CMS\Extbase\Property\TypeConverter;

/*                                                                        *
 * This script belongs to the Extbase framework                           *
 *                                                                        *
 * It is free software; you can redistribute it and/or modify it under    *
 * the terms of the GNU Lesser General Public License as published by the *
 * Free Software Foundation, either version 3 of the License, or (at your *
 * option) any later version.                                             *
 *                                                                        *
 * This script is distributed in the hope that it will be useful, but     *
 * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHAN-    *
 * TABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser       *
 * General Public License for more details.                               *
 *                                                                        *
 * You should have received a copy of the GNU Lesser General Public       *
 * License along with the script.                                         *
 * If not, see http://www.gnu.org/licenses/lgpl.html                      *
 *                                                                        *
 * The TYPO3 project - inspiring people to share!                         *
 *                                                                        */
class IntegerConverter extends \TYPO3\CMS\Extbase\Property\TypeConverter\AbstractTypeConverter implements \TYPO3\CMS\Core\SingletonInterface
{
    protected $sourceTypes = ['integer', 'string'];

    protected $targetType = 'integer';

    protected $priority = 10;

    public function convertFrom($source, $targetType, array $convertedChildProperties = [], \TYPO3\CMS\Extbase\Property\PropertyMappingConfigurationInterface $configuration = null)
    {
        if ($source === null || (string)$source === '') {
            return null;
        }
        if (!is_numeric($source)) {
            return new \TYPO3\CMS\Extbase\Error\Error('"%s" is no integer.', 1332933658, [$source]);
        }
        return (int)$source;
    }
}