protected function getDefaultConfigurationFile($entityTypeCode)
    {

        // query whether or not a default configuration file for the passed entity type code exists
        if (isset($this->configurationFileMappings[$entityTypeCode])) {
            return $this->configurationFileMappings[$entityTypeCode];
        }

        // throw an exception, if no default configuration file for the passed entity type is available
        throw new \Exception(
            sprintf(
                'Can\'t find a default configuration file for entity Type Code \'%s\' (MUST be one of catalog_product, catalog_product_price, catalog_product_inventory, catalog_category or eav_attribute)',
                $entityTypeCode
            )
        );
    }