public boolean isGradleSdk(VirtualFile @Nullable ... files) {
    if (files == null) {
      return false;
    }
    File[] arg = new File[files.length];
    for (int i = 0; i < files.length; i++) {
      arg[i] = new File(files[i].getPresentableUrl());
    }
    return isGradleSdk(arg);
  }
public boolean isGradleSdk(VirtualFile @Nullable ... files)