[protobuf] Forcing JSON encoding to include default values (Java?)

[Marco]

The documentation mentions "An implementation may provide options to emit
fields with default values in the JSON-encoded output."

I assumed that meant an implementation of Printer class, ie. an alternative
to JsonFormat.printer().print(myMessage), but it appears that any
implementation would depend on GeneratedMessage::getAllFields() which does
not include default fields (GeneratedMessage:2123). I also read through
descriptor.proto to see if there was an option for this, but that did not
appear to be the case.

Is there a way to do this out of the box, or would it require code changes?
And would this be different for other languages? (This is using proto3, if
that's not implied by the above.)

['Feng Xiao' via Protocol Buffers]

Post by Marco
The documentation mentions "An implementation may provide options to emit
fields with default values in the JSON-encoded output."
I assumed that meant an implementation of Printer class, ie. an
alternative to JsonFormat.printer().print(myMessage), but it appears
that any implementation would depend on GeneratedMessage::getAllFields()
which does not include default fields (GeneratedMessage:2123). I also
read through descriptor.proto to see if there was an option for this, but
that did not appear to be the case.
Is there a way to do this out of the box, or would it require code
changes? And would this be different for other languages? (This is using
proto3, if that's not implied by the above.)

...

The option is not added yet. It will be something like:
JsonFormat.printer().printingDefaultValueFields().print(myMessage);

Likely it will be included in the next beta release.

Post by Marco
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[Rich]

Where is JsonFormat defined?

No reference to how to print JSON from Java in the docs. Nothing in the API
index.

Post by 'Feng Xiao' via Protocol Buffers

Post by Marco
The documentation mentions "An implementation may provide options to emit
fields with default values in the JSON-encoded output."
I assumed that meant an implementation of Printer class, ie. an
alternative to JsonFormat.printer().print(myMessage), but it appears
that any implementation would depend on GeneratedMessage::getAllFields()
which does not include default fields (GeneratedMessage:2123). I also
read through descriptor.proto to see if there was an option for this, but
that did not appear to be the case.
Is there a way to do this out of the box, or would it require code
changes? And would this be different for other languages? (This is using
proto3, if that's not implied by the above.)

JsonFormat.printer().printingDefaultValueFields().print(myMessage);
Likely it will be included in the next beta release.

Post by Marco
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['Feng Xiao' via Protocol Buffers]

Post by Rich
Where is JsonFormat defined?
No reference to how to print JSON from Java in the docs. Nothing in the
API index.

See:
https://github.com/google/protobuf/blob/master/java/util/src/main/java/com/google/protobuf/util/JsonFormat.java

It's deployed to maven as a separate artifact: protobuf-java-util.
<http://mvnrepository.com/artifact/com.google.protobuf/protobuf-java-util/3.0.0-beta-2>

Post by Rich

Post by 'Feng Xiao' via Protocol Buffers

Post by Marco
The documentation mentions "An implementation may provide options to
emit fields with default values in the JSON-encoded output."
I assumed that meant an implementation of Printer class, ie. an
alternative to JsonFormat.printer().print(myMessage), but it appears
that any implementation would depend on GeneratedMessage::getAllFields()
which does not include default fields (GeneratedMessage:2123). I also
read through descriptor.proto to see if there was an option for this, but
that did not appear to be the case.
Is there a way to do this out of the box, or would it require code
changes? And would this be different for other languages? (This is using
proto3, if that's not implied by the above.)

JsonFormat.printer().printingDefaultValueFields().print(myMessage);
Likely it will be included in the next beta release.

Post by Marco
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...