DocumentHandlersManager::getDefaultHandlerForView

public function getDefaultHandlerForView()
{
	$documentHandler = $this->getHandlerByCode(Configuration::getDefaultViewerServiceCode());
	if(!$documentHandler instanceof IViewer)
	{
		throw new SystemException("Invalid class '{$documentHandler::getCode()}' for documentHandler. Must be implement IViewer");
	}

	return $documentHandler;
}