You could manually iterate through the data and only check for that field,
e.g., in Java (untested):
import com.google.protobuf.CodedInputStream;
import com.google.protobuf.WireFormat;
private static boolean containsHotels(byte[] data) throws IOException {
return containsField(CodedInputStream.newInstance(data), Message.
HOTELS_FIELD_NUMBER);
}
private static boolean containsField(CodedInputStream input, int fieldNumber)
throws IOException {
while (!input.isAtEnd()) {
int tag = input.readTag();
if (WireFormat.getTagFieldNumber(tag) == fieldNumber) {
return true;
}
input.skipField(tag);
}
return false;
}
On Tuesday, May 9, 2023 at 11:46:52 AM UTC+2 Joan Balagueró wrote:
> Hello,
>
> I'm receiving protobuf messages from a client (I can't modify them in any
> way) with a list of hotels. There are hotels in the 90% of the times, but I
> need to differentitate when I receive hotels and when not.
>
> The proto file for "no hotels" is something like below (simplified):
> 1: {
> 1: {}
> 2: {}
> }
>
> Is there any way to check the "2:" element is empty without loading the
> whole proto into memory?
>
> Thanks,
>
> Joan.
>
>
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