@Override
  public @Nullable VirtualFile findRootByClass(@NotNull List<? extends VirtualFile> roots, String fqn) {
    for (VirtualFile file : roots) {
      if (findInFile(file, new StringTokenizer(fqn, "."))) return file;
    }
    return null;
  }
@Override
  public @Nullable VirtualFile findRootByClass(@NotNull List<? extends VirtualFile> roots, String fqn)