I have been looking into ways in which the JsonFormat class can be used to
create a TypeAdapter<Message> that can be registered with Gson. Writing out
a Message object to JSON is not an issue but parsing a JSON into Message
object is a challenge as Gson TypeAdapter's read method gives you a
JsonReader as input.
Internally, JsonFormat's merge method creates a JsonReader from
java.io.Reader, so if a merge method can take a JsonReader as input, then
it should be possible to create an appropriate TypeAdapter that can be
registered with Gson.
Would it make sense to introduce a merge() method on JsonFormat that takes
a JsonReader. Something like
public void merge(JsonReader json, Message.Builder builder);
Please let me know what you think.
On Monday, September 21, 2015 at 4:20:35 PM UTC-7, Feng Xiao wrote:
> On Mon, Sep 21, 2015 at 3:37 PM, Siddharth Chhabra <siddhart...@gmail.com
>> Quick question about the json support
>> 1. Will we get json support if we mix proto2 and proto3 syntax ? is that
>> supported ?
> You can mix that only in a sub-set of the languages (languages with proto2
> support: C++, Java, Python and Go). When converted to JSON, proto2-only
> features like extensions will be ignored completely.
>> 2. Since we are using extensions in proto2, can that be used as a member
>> field in a proto3 syntax file ?
> Not sure what you mean. You can import proto2 files in proto3 syntax files
> (again, only work when compiled into languages with proto2 support) and
> declare the type of a proto3 field to be a proto2 message, but you can not
> extend a proto3 message or declare an extension to a proto2 message in a
> proto3 syntax file.
>> Please let us know.
>> On Fri, Sep 11, 2015 at 5:35 PM, Feng Xiao <xiao...@google.com
>>> On Fri, Sep 11, 2015 at 5:23 PM, Siddharth Chhabra <
>>>> Was this added ?
>>>> I cant find the JsonFormat class in the api referenc
>>>> The JsonFormat class was mentioned in the thread "Will protobuf support
>>>> The api is here :
>>>> We are thinking of upgrading to protobuf 3 and want to make sure json
>>>> support is there since otherwise we dont have a need to upgrade.
>>> Sorry, the Java doc hasn't been updated yet. You can find the JsonFormat
>>> class here:
>>>> Please let us know
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