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// Copyright 2013 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef GOOGLE_APIS_GCM_BASE_MCS_MESSAGE_H_
#define GOOGLE_APIS_GCM_BASE_MCS_MESSAGE_H_
#include <string>
#include "base/basictypes.h"
#include "base/memory/ref_counted.h"
#include "base/memory/scoped_ptr.h"
#include "google_apis/gcm/base/gcm_export.h"
namespace google {
namespace protobuf {
class MessageLite;
} // namespace protobuf
} // namespace google
namespace gcm {
// A wrapper for MCS protobuffers that encapsulates their tag, size and data
// in an immutable and thread-safe format. If a mutable version is desired,
// CloneProtobuf() should use used to create a new copy of the protobuf.
//
// Note: default copy and assign welcome.
class GCM_EXPORT MCSMessage {
public:
// Creates an invalid MCSMessage.
MCSMessage();
// Infers tag from |message|.
explicit MCSMessage(const google::protobuf::MessageLite& protobuf);
// |tag| must match |protobuf|'s message type.
MCSMessage(uint8 tag, const google::protobuf::MessageLite& protobuf);
// |tag| must match |protobuf|'s message type. Takes ownership of |protobuf|.
MCSMessage(uint8 tag,
scoped_ptr<const google::protobuf::MessageLite> protobuf);
~MCSMessage();
// Returns whether this message is valid or not (whether a protobuf was
// provided at construction time or not).
bool IsValid() const;
// Getters for serialization.
uint8 tag() const { return tag_; }
int size() const {return size_; }
std::string SerializeAsString() const;
// Getter for accessing immutable probotuf fields.
const google::protobuf::MessageLite& GetProtobuf() const;
// Getter for creating a mutated version of the protobuf.
scoped_ptr<google::protobuf::MessageLite> CloneProtobuf() const;
private:
class Core : public base::RefCountedThreadSafe<MCSMessage::Core> {
public:
Core();
Core(uint8 tag, const google::protobuf::MessageLite& protobuf);
Core(uint8 tag, scoped_ptr<const google::protobuf::MessageLite> protobuf);
const google::protobuf::MessageLite& Get() const;
private:
friend class base::RefCountedThreadSafe<MCSMessage::Core>;
~Core();
// The immutable protobuf.
scoped_ptr<const google::protobuf::MessageLite> protobuf_;
DISALLOW_COPY_AND_ASSIGN(Core);
};
// These are cached separately to avoid having to recompute them.
const uint8 tag_;
const int size_;
// The refcounted core, containing the protobuf memory.
scoped_refptr<const Core> core_;
};
} // namespace gcm
#endif // GOOGLE_APIS_GCM_BASE_MCS_MESSAGE_H_
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