class DownloadUriOutputStream implements DownloadOutputStream {

    @Override
    public void seek(long offset) throws IOException {
        channel.position(offset);
    }

    public  DownloadUriOutputStream(Context context, Uri uri, int bufferSize);
      DownloadUriOutputStream(@NonNull FileChannel channel, @NonNull ParcelFileDescriptor pdf,
                            @NonNull FileOutputStream fos,
                            @NonNull BufferedOutputStream out);

}