You can't just parse any message type into *DescriptorProto. Those are
protocol buffers which represent the type definition of other protocol
buffers (e.g. your Request msg). You want to use DynamicMessage in order to
operate on generic messages.
On Wed, Oct 27, 2010 at 9:55 AM, maninder batth <batth.manin...@gmail.com>wrote:
> I have a PB like
> message Request {
> required int64 supplierId = 1;
> optional string message_type = 2;
> }
>
> Then i constructed the message as follows :-
> Request request = Request.newBuilder()
> .setSupplierId(100L)
> .setMessageType("blah").build();
>
> Then i check the values by parsing it from the "known" Request type
> as
> Request request1 = Request.parseFrom(request.toByteArray());
> System.out.println(request1.getSupplierId());
>
> It correctly responds with 100.
>
> Then i try to parse it via generic fashion
>
> FileDescriptorProto fdp =
> FileDescriptorProto.parseFrom(request.toByteArray());
> FieldDescriptor supp =
> fdp.getDescriptor().findFieldByNumber(1);
> System.out.println(fdp.getField(supp)); // Nothing prints
>
> FieldDescriptor supp1 =
> fdp.getDescriptor().findFieldByNumber(2);
> System.out.println(fdp.getField(supp1)); // Prints correctly
> the
> value "blah"
>
> 1. My question is what happened to my supplierId field in the above
> case?
> FieldDescriptorProto gives me a correct FIeldDescriptor for field
> number 2, but it acts like it has no awarness of field name 1.
>
> 2. Given a FieldDescriptor, how can i find the name of the field? I
> would like to see field names such as supplierId or message_type.
> FieldDescriptor.getName() returns the value "package"... i dont
> understand why it returns the word "package"
>
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