ObjectStorageConverter.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 ObjectStorageConverter extends AbstractTypeConverter
{
    protected $sourceTypes = ['string', 'array'];

    protected $targetType = \TYPO3\CMS\Extbase\Persistence\ObjectStorage::class;

    protected $priority = 10;

    public function convertFrom($source, $targetType, array $convertedChildProperties = [], \TYPO3\CMS\Extbase\Property\PropertyMappingConfigurationInterface $configuration = null)
    {
        $objectStorage = new \TYPO3\CMS\Extbase\Persistence\ObjectStorage();
        foreach ($convertedChildProperties as $subProperty) {
            $objectStorage->attach($subProperty);
        }
        return $objectStorage;
    }

    public function getSourceChildPropertiesToBeConverted($source)
    {
        if (is_array($source)) {
            return $source;
        }
        return [];
    }

    public function getTypeOfChildProperty($targetType, $propertyName, \TYPO3\CMS\Extbase\Property\PropertyMappingConfigurationInterface $configuration)
    {
        $parsedTargetType = \TYPO3\CMS\Extbase\Utility\TypeHandlingUtility::parseType($targetType);
        return $parsedTargetType['elementType'];
    }
}