protected function prepareData(ClassMetadata $metadata, array $data)
 {
     foreach ($data as $name => &$entityData) {
         switch ($metadata->name) {
             case Localization::CN():
             case PageLocalization::CN():
             case TemplateLocalization::CN():
             case ApplicationLocalization::CN():
                 $entityData['publishedRevision'] = null;
                 $args = array($entityData['locale']);
                 break;
             case PageLocalizationPath::CN():
                 $args = array(str_ireplace('pageLocalizationPath', '', $name), $entityData['locale']);
                 break;
             case TemplateLayout::CN():
                 $args = array($entityData['media']);
                 break;
             case BlockPropertyMetadata::CN():
                 $args = array($entityData['name'], $entityData['blockProperty']);
                 break;
             case BlockProperty::CN():
                 $args = array($entityData['name']);
                 break;
             case PagePlaceHolder::CN():
             case TemplatePlaceHolder::CN():
                 $args = array($entityData['name']);
                 break;
             default:
                 $constructor = new \ReflectionMethod($metadata->name, '__construct');
                 if ($constructor->getNumberOfRequiredParameters() === 0) {
                     return parent::prepareData($metadata, $data);
                 }
                 throw new \RuntimeException(sprintf('Don\'t know how to build constructor required for [%s].', $metadata->name));
         }
         $entityData = array_merge(array('__construct' => $args), $entityData);
     }
     return parent::prepareData($metadata, $data);
 }