private static String[] pointersToUrls(Collection<? extends LightFilePointer> pointers) {
    List<String> urls = new ArrayList<>(pointers.size());
    for (LightFilePointer pointer : pointers) {
      urls.add(pointer.getUrl());
    }
    return ArrayUtilRt.toStringArray(urls);
  }
private static String[] pointersToUrls(Collection<? extends LightFilePointer> pointers)