How does this differ from net/proto2/util/public/field_path.h?
On Fri, Dec 4, 2009 at 2:17 PM, Scott Stafford <[email protected]>wrote:
> Hi -
>
> We built a simplified XPath-like syntax (and implementation for C++)
> to control the Reflection interface via strings. For instance,
>
> message Substructure
> {
> required int32 id = 10;
>
> required int32 field1 = 1;
> optional int32 field2 = 2;
> repeated int32 field3 = 3;
> }
>
> message Structure
> {
> repeated int32 field1 = 1;
> repeated Substructure field2 = 2;
> }
>
> PBPath::clearField( myMessage, "field2[0]" );
>
> would basically run myMessage.clear_field2();
>
> and
>
> PBPath::GetInt32( myMessage, "field2[id=50].field3[1]" );
>
> would search myMessage.field2() for a message with id()==50, then get
> the second element of Substructure.field3() and return it.
>
> Is this something people would be interested in if I cleaned it up for
> release as a separate library? Is there any interest in me submitting
> a patch to build it in to the protobuf library directly in some form?
> If so, what form?
>
> The implementation involves digesting the xpath-like string into a
> protobuf object that contains field ids and so on.
>
> In case you're interested, our use case involved having a large local
> Protobuf object containing configuration data. We needed a way to
> have a remote process send in commands to clear and update various
> parts of the configuration data object. So it sent the digested xpath
> strings to clear various subtrees or elements. Updating was easy, we
> could simply send in a new object with all the updates set and Merge
> it in...
>
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>
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