Suppose those strings are all defined as optional fields in the message.
They may not be present in the serialization, so the decoder needs to read a
tag to determine the field number and type before handling the value.

On Wed, Aug 11, 2010 at 8:37 AM, Prakash Rao <prakashrao1...@gmail.com>wrote:

> Hi,
> I was just looking at CodedInputStream class and there are APIs to
> write primitives with or without tag (for example, writeString &
> writeStringNoTag). I thought if we set unique tags for multiple
> parameters then we would be able to retrieve these parameters using
> tag numbers specified using CodedInputStream class. I don't see any
> APIs to read values based on tags in CodedInputStream. Am I missing
> something? For the time being I’m using pushLimit & popLimit APIs to
> get different parameter values (based on serializedSize).
>
> For example,
> int test(String s1, String s2, String s3) {
> }
>
> CodedOutputStream out = CodedOutputStream.newIInstance("Some Output
> Stream");
> out.writeString(1, s1);
> out.writeString(2, s2);
> out.writeString(3, s3);
> out.flush();
>
> Why these are not possible?
> CodedInputStream in = CodedInputStream.newIInstance("Some Input
> Stream");
> String s1 = in.readString(1);
> String s2 = in.readString(2);
> String s3 = in.readString(3);
>
> Regards,
> Prakash
>
>
>
>
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