@Nullable
  private static UExpression getReturnExpression(PsiClass psiClass, String methodName) {
    final PsiMethod[] methods = psiClass.findMethodsByName(methodName, false);
    if (methods.length != 1) {
      return null;
    }

    return PsiUtil.getReturnedExpression(methods[0]);
  }
@Nullable
  private static UExpression getReturnExpression(PsiClass psiClass, String methodName)