@Nullable
  public static PsiDirectory getContainerDirectory(final PsiElement psiElement) {
    if (psiElement instanceof PsiPackage) {
      final PsiDirectory[] directories = ((PsiPackage)psiElement).getDirectories();
      return directories.length == 1 ? directories[0] : null; //??
    }
    if (psiElement instanceof PsiDirectory) {
      return (PsiDirectory)psiElement;
    }
    if (psiElement != null) {
      return psiElement.getContainingFile().getContainingDirectory();
    }
    return null;
  }
@Nullable
  public static PsiDirectory getContainerDirectory(final PsiElement psiElement)