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//
// upb - a minimalist implementation of protocol buffers.
//
// Copyright (c) 2011-2012 Google Inc. See LICENSE for details.
// Author: Josh Haberman <jhaberman@gmail.com>
//
// Support for registering field handlers that can write into a legacy proto1
// message. This functionality is only needed inside Google.
//
// This is a low-level interface; the high-level interface in google.h is
// more user-friendly.
#ifndef UPB_GOOGLE_PROTO1_H_
#define UPB_GOOGLE_PROTO1_H_
namespace proto2 {
class FieldDescriptor;
class Message;
}
namespace upb {
class FieldDef;
class Handlers;
}
namespace upb {
namespace google {
// Sets field handlers in the given Handlers object for writing to a single
// field (as described by "proto2_f" and "upb_f") into a message constructed
// by the same factory as "prototype." Returns true if this was successful
// (this will fail if "prototype" is not a proto1 message, or if we can't
// handle it for some reason).
bool TrySetProto1WriteHandlers(const proto2::FieldDescriptor* proto2_f,
const proto2::Message& prototype,
const upb::FieldDef* upb_f, upb::Handlers* h);
// Returns a prototype for the given field in "m", if it is weak. The returned
// message could be the linked-in message type or OpaqueMessage, if the weak
// message is *not* linked in. Otherwise returns NULL.
const proto2::Message* GetProto1WeakPrototype(
const proto2::Message& m,
const proto2::FieldDescriptor* f);
// Returns a prototype for the given non-weak field in "m".
const proto2::Message* GetProto1FieldPrototype(
const proto2::Message& m,
const proto2::FieldDescriptor* f);
} // namespace google
} // namespace upb
#endif // UPB_GOOGLE_PROTO1_H_
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