static File copyFile(File src, File dest) ctex {
  File destDir = dest.getAbsoluteFile().getParentFile();
  if (destDir != null) destDir.mkdirs();
  File tempFile = new File(dest.getPath() + "_temp");
  FileInputStream inputStream = new FileInputStream(src.getPath());
  FileOutputStream outputStream = newFileOutputStream(tempFile.getPath());
  try {
    copyStream(inputStream, outputStream);
    inputStream.close();
  } finally {
    outputStream.close();
  }
  try {
    java.nio.file.Files.move(tempFile.toPath(), dest.toPath(),
      java.nio.file.StandardCopyOption.REPLACE_EXISTING,
      java.nio.file.StandardCopyOption.ATOMIC_MOVE);
  } catch (java.nio.file.AtomicMoveNotSupportedException e) {
    java.nio.file.Files.move(tempFile.toPath(), dest.toPath(),
      java.nio.file.StandardCopyOption.REPLACE_EXISTING);
  }
  ret dest;
}