Thanks for your response Feng.
That would work perfectly for our needs. We'll try it out and report back.
Marcos
On Wed, Feb 24, 2016 at 12:59 PM, Feng Xiao <xiaof...@google.com> wrote:
>
>
> On Mon, Feb 22, 2016 at 3:07 PM, Marcos Juarez <mjua...@gmail.com> wrote:
>
>> Is there a way to have a "base" protobuf with a set of common fields,
>> and then have projects/apps extend that with their own custom fields?
>> We're trying to minimize copy/pasting of the same fields all over the
>> place, for messages that will have a lot of common fields, that then need
>> specialization within different parts of the codebase.
>>
>> Say something like:
>>
>> message BaseProtobuf {
>> required int id = 1;
>> required int field1 = 2;
>> required string label = 3;
>> }
>>
>> and then multiple files like:
>>
>> message CustomProtobuf1 extend BaseProtobuf {
>> required int customId = 11;
>> optional string customLabel = 12;
>> }
>>
>> message CustomProtobuf2 extend BaseProtobuf {
>> required int anotherCustomId = 11;
>> optional string customLabel = 12;
>> }
>>
>> Of course, at compile time, the user would have to specify the location
>> of the base protobuf definitions, if any, since protoc would need all of
>> them to generate the java source code.
>>
>> I do know about the import functionality, but that's more targeted for
>> type and enum definitions, not for inheriting base fields, so it doesn't
>> really address my question above.
>>
> Protobuf doesn't support inheritance. I suggest using composition instead.
> Such as:
>
> message CustomProtobuf1 {
> optional BaseProtobuf base = 1;
> required int customId = 11;
> optional string customLabel = 12;
> }
>
>
>
>>
>> Thanks,
>>
>> Marcos Juarez
>>
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