src/main/php/routing/SupportedMimeTypes.php
public function classFor(string $mimeType)
    {
        if ($this->provideClass($mimeType)) {
            return $this->mimeTypeClasses[$mimeType];
        }

        return null;
    }
public function classFor(string $mimeType)
    {
        if ($this->provideClass($mimeType)) {
            return $this->mimeTypeClasses[$mimeType];
        }

        return null;
    }
public function classFor ( string $ mimeType ) { if ( $ this -> provideClass ( $ mimeType ) ) { return $ this -> mimeTypeClasses [ $ mimeType ] ; } return null ; }
returns special class which was defined for given mime type or null if none defined

@param   string  $mimeType
@return  string|null
@since   3.2.0
returns special class which was defined for given mime type or null if none defined