@NotNull
  DataOutputStream writeContent(int fileId,
                                boolean fixedSize) {
    return new DataOutputStream(contentAccessor.new ContentOutputStream(fileId, fixedSize)) {
      @Override
      public void close() {
        try {
          super.close();
        }
        catch (IOException e) {
          throw handleError(e);
        }
      }
    };
  }
@NotNull
  DataOutputStream writeContent(int fileId,
                                boolean fixedSize)