sclass Zip2Zip_Zip4j is AutoCloseable {
  // must set
  File inZip;
  new Set<S> filesWritten;
  
  // optional
  IPred<S> predicate;
  
  // internal
  Zip4j_MergeZipFilesWithFilter zip4j;
  
  close { dispose zip4j; }
  
  *(File outZip) ctex {
    zip4j = new Zip4j_MergeZipFilesWithFilter(outZip);
  }
  
  run {
    zip4j.addZipFile(inZip, fileName -> {
      if (predicate != null && !predicate.get(fileName))
        false;
      ret filesWritten.add(fileName);
    });
  }
  
  void finish() ctex {
    zip4j.finish();
  }
}