Getting all fields of Message through the java reflection api

[Thibaut]

Hi,

I can't find a method how I can access all the fields of the message.
There is a method .getAllFields(); on the Message and Builder objects,
but this will only return the fields which are set.

I need to get access to all the fields (also those not set!) of a
Message m object, so I can update the unset fields through the
corresponding builder object (Message.Builder b = m.newBuilderForType
().mergeFrom(m);).
How can I do this?

Thanks,
Thibaut

[Kenton Varda]

Use getDescriptor() to get the descriptor, then iterate through descriptor.fields().

Note that this will not cover extensions.

BTW, I believe m.toBuilder() is equivalent to m.newBuilderForType().mergeFrom(m).

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[Thibaut]

Thanks,

It's working fine now!