thank you
You suggest that this is the best way?
..Foo oldfoo = get_from_elsewhere();
..Baz newbaz = oldfoo.c1.toBuilder().set_f1(42).Build();
..Foo newfoo = oldfoo.toBuilder().set_c1(newbaz).Build();
..send_somewhere(newfoo);
i see this problematic if i have messages nested in messages
Il giorno lunedì 10 ottobre 2011 19:05:45 UTC+2, Ron ha scritto:
>
> i believe this is where Foo.newBuilder(Foo oldFoo) comes into play. PB
> messages once built are immutable so instead you create a builder around an
> immutable Foo, change what you want through the builder's methods, then
> build a new (immutable) message using Builder.build().
> there's also the method foo.toBuilder() which will do the same thing.
>
> ------------------------------
> *From:* marco gaddoni <marco...@gmail.com>
> *To:* prot...@googlegroups.com
> *Sent:* Monday, October 10, 2011 8:44 AM
> *Subject:* [protobuf] creating a message from another but changing only
> one field
>
>
> Hello,
>
> i am using protocol buffers to comunicate between two programs,
> one in c# and the other in c++.
>
> it is working well.
>
> i have a generic question with the c# (and i think the java) api:
> how do you create a different message from an existing one
> but changin only one field?
>
> say that i have
>
> message foo {
> ..message baz {
> ....int32 f1 = 1;
> ..}
>
> ..required baz c1;
> ..required int32 f2;
> }
>
> and i have a message in java Foo msg;
> how do i create a new message identical to
> msg but with f1 different ?
>
> in my code i have to write a lot of code
> and that code is fragile because i have to
> .Merge mostly field by field everything and if i
> change the structure of the message adding one
> field i have to change my code.
>
> there is another way to do it ?
>
> ...
>
>
>
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