Loader/StandardLoaderFactory.php
protected function getClassNameByShortType($type)
    {
        if (!isset($this->shortTypeToClassMapping[$type])) {
            throw UnknownFormatException::create($type);
        }

        return $this->shortTypeToClassMapping[$type];
    }
protected function getClassNameByShortType($type)
    {
        if (!isset($this->shortTypeToClassMapping[$type])) {
            throw UnknownFormatException::create($type);
        }

        return $this->shortTypeToClassMapping[$type];
    }
Get loader class name based on short name
@param  string                 $type
@return string                 Loader class name
@throws UnknownFormatException