private function getParameterStrings(string $parameterString): array
    {
        $rawParameterStrings = explode(self::TYPE_PARAMETER_SEPARATOR, $parameterString);
        $parameterStrings = array();

        foreach ($rawParameterStrings as $rawParameterString) {
            if ($rawParameterString != '') {
                $parameterStrings[] = trim($rawParameterString);
            }
        }

        return $parameterStrings;
    }