Hi, I change ArchiveOutputStream extend FilterOutputStream while I modified ZipArchiveOutputStream and it seems a very natural thing to do for all the other streams as well. All concrete compressor/archiver streams have constructors that take a different stream as their argument and most of them store it somewhere internally so Filter*Stream seems a natural choice. Stefan --------------------------------------------------------------------- To unsubscribe, e-mail: dev-unsubscribe@commons.apache.org For additional commands, e-mail: dev-help@commons.apache.org