FieldValue Converter::ConvertSpecialValue()

in blogs/sept-2021/converter.cc [198:233]

• 25 lines of code
• 7 McCabe index (conditional complexity)

FieldValue Converter::ConvertSpecialValue(
    const std::map<Variant, Variant>& from) const {
  // Special values are Firestore entities encoded as maps because they are not
  // directly supported by `Variant`. The assumption is that the map contains
  // a boolean field "special" set to true and a string field "type" indicating
  // which kind of an entity it contains.

  std::string type = TryGetString(from, "type");
  if (type.empty()) {
    return {};
  }

  if (type == "timestamp") {
    Timestamp result(TryGetInteger(from, "seconds"),
                     TryGetInteger(from, "nanoseconds"));
    return FieldValue::Timestamp(result);

  } else if (type == "geo_point") {
    GeoPoint result(TryGetDouble(from, "latitude"),
                    TryGetDouble(from, "longitude"));
    return FieldValue::GeoPoint(result);

  } else if (type == "document_reference") {
    DocumentReference result =
        firestore_->Document(TryGetString(from, "document_path"));
    return FieldValue::Reference(result);

  } else if (type == "delete") {
    return FieldValue::Delete();

  } else if (type == "server_timestamp") {
    return FieldValue::ServerTimestamp();
  }

  return {};
}