public static StreamFilterNotNullFix makeFix(PsiElement reference) {
    PsiFunctionalExpression fn = findFunction(reference);
    if (fn == null) return null;
    PsiExpressionList args = tryCast(PsiUtil.skipParenthesizedExprUp(fn.getParent()), PsiExpressionList.class);
    if (args == null || args.getExpressionCount() != 1) return null;
    PsiMethodCallExpression call = tryCast(args.getParent(), PsiMethodCallExpression.class);
    if (call == null) return null;
    PsiExpression qualifier = call.getMethodExpression().getQualifierExpression();
    if (qualifier == null || !InheritanceUtil.isInheritor(qualifier.getType(), CommonClassNames.JAVA_UTIL_STREAM_STREAM)) return null;
    return new StreamFilterNotNullFix();
  }
public static StreamFilterNotNullFix makeFix(PsiElement reference)