AbstractFileFolderConverter.php

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

abstract class AbstractFileFolderConverter extends \TYPO3\CMS\Extbase\Property\TypeConverter\AbstractTypeConverter {

    protected $priority = 1;

    protected $expectedObjectType;

    protected $fileFactory;

    public function convertFrom($source, $targetType, array $convertedChildProperties = array(), \TYPO3\CMS\Extbase\Property\PropertyMappingConfigurationInterface $configuration = NULL) {
        $object = $this->getOriginalResource($source);
        if (empty($this->expectedObjectType) || !$object instanceof $this->expectedObjectType) {
            throw new \TYPO3\CMS\Extbase\Property\Exception('Expected object of type "' . $this->expectedObjectType . '" but got ' . get_class($object), 1342895975);
        }
        $subject = $this->objectManager->get($targetType);
        $subject->setOriginalResource($object);
        return $subject;
    }

    abstract protected function getOriginalResource($source);
}