public function getMediaTypeData($mediaType)
    {
        $map = $this->getRequestAcceptMap();
        list($type, $subType) = $this->normalizeMediaType($mediaType);
        $result = [];
        foreach ($this->getMediaTypeAlternatives($type, $subType) as $alternative) {
            if (isset($map[$alternative])) {
                $result[$alternative] = $map[$alternative];
            }
        }

        return $result;
    }