ArrayConverter.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 ArrayConverter extends \TYPO3\CMS\Extbase\Property\TypeConverter\AbstractTypeConverter {

    protected $sourceTypes = array('array', 'string');

    protected $targetType = 'array';

    protected $priority = 1;

    public function canConvertFrom($source, $targetType) {
        return is_string($source) && $source === '' || is_array($source);
    }

    public function convertFrom($source, $targetType, array $convertedChildProperties = array(), \TYPO3\CMS\Extbase\Property\PropertyMappingConfigurationInterface $configuration = NULL) {
        if (is_string($source)) {
            if ($source === '') {
                $source = array();
            }
        }

        return $source;
    }
}