public static function getDefaultFilter($filterName)
	{
		$filterName = ucfirst(strtolower($filterName));
		$className  = 's9e\\TextFormatter\\Configurator\\Items\\AttributeFilters\\' . $filterName . 'Filter';

		if (!class_exists($className))
		{
			throw new InvalidArgumentException("Unknown attribute filter '" . $filterName . "'");
		}

		return new $className;
	}