private @Nullable Object getSlowData(@NotNull String dataId) {
      if (CommonDataKeys.PSI_ELEMENT.is(dataId)) {
        return getMethod();
      }
      else if (UsageView.USAGE_INFO_KEY.is(dataId)) {
        PsiMethod method = getMethod();
        return method == null ? null : new UsageInfo(method);
      }
      return null;
    }
private @Nullable Object getSlowData(@NotNull String dataId)