protected function _exportData() {
		$data = $this->_entity ? $this->_entity->export() : $this->_data;

		if (!$list = $this->_config['whitelist']) {
			return $data;
		}
		$list = array_combine($list, $list);

		if (!$this->_entity) {
			return array_intersect_key($data, $list);
		}
		foreach ($data as $type => $values) {
			if (!is_array($values)) {
				continue;
			}
			$data[$type] = array_intersect_key($values, $list);
		}
		return $data;
	}