private List<File> getFilesImpl(final Set<AntFilesProvider> processed) {
    processed.add(this);
    try {
      final AntDomElement referenced = getRefId().getValue();
      if (referenced instanceof AntFilesProvider) {
        return ((AntFilesProvider)referenced).getFiles(processed);
      }
      return getFiles(getAntPattern(), processed);
    }
    finally {
      processed.remove(this);
    }
  }
private List<File> getFilesImpl(final Set<AntFilesProvider> processed)