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// Copyright 2012 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.
#include <iosfwd>
#include <string>
#include <vector>
#include "base/basictypes.h"
#include "sync/base/sync_export.h"
#include "sync/internal_api/public/base/model_type.h"
#include "sync/internal_api/public/util/immutable.h"
namespace sync_pb {
class EntitySpecifics;
class SyncEntity;
} // namespace sync_pb
namespace syncer {
// A light-weight container for immutable sync data. Pass-by-value and storage
// in STL containers are supported and encouraged if helpful.
class SYNC_EXPORT SyncData {
// Creates an empty and invalid SyncData.
// Default copy and assign welcome.
// Helper methods for creating SyncData objects for local data.
// The sync tag must be a string unique to this datatype and is used as a node
// identifier server-side.
// For deletes: |datatype| must specify the datatype who node is being
// deleted.
// For adds/updates: the specifics must be valid and the non-unique title (can
// be the same as sync tag) must be specfied.
// Note: the non_unique_title is primarily for debug purposes, and will be
// overwritten if the datatype is encrypted.
static SyncData CreateLocalDelete(
const std::string& sync_tag,
ModelType datatype);
static SyncData CreateLocalData(
const std::string& sync_tag,
const std::string& non_unique_title,
const sync_pb::EntitySpecifics& specifics);
// Helper method for creating SyncData objects originating from the syncer.
static SyncData CreateRemoteData(
int64 id, const sync_pb::EntitySpecifics& specifics);
// Whether this SyncData holds valid data. The only way to have a SyncData
// without valid data is to use the default constructor.
bool IsValid() const;
// Return the datatype we're holding information about. Derived from the sync
// datatype specifics.
ModelType GetDataType() const;
// Return the current sync datatype specifics.
const sync_pb::EntitySpecifics& GetSpecifics() const;
// Returns the value of the unique client tag. This is only set for data going
// TO the syncer, not coming from.
const std::string& GetTag() const;
// Returns the non unique title (for debugging). Currently only set for data
// going TO the syncer, not from.
const std::string& GetTitle() const;
// Should only be called by sync code when IsLocal() is false.
int64 GetRemoteId() const;
// Whether this sync data is for local data or data coming from the syncer.
bool IsLocal() const;
std::string ToString() const;
// TODO(zea): Query methods for other sync properties: parent, successor, etc.
// Necessary since we forward-declare sync_pb::SyncEntity; see
// comments in immutable.h.
struct ImmutableSyncEntityTraits {
typedef sync_pb::SyncEntity* Wrapper;
static void InitializeWrapper(Wrapper* wrapper);
static void DestroyWrapper(Wrapper* wrapper);
static const sync_pb::SyncEntity& Unwrap(const Wrapper& wrapper);
static sync_pb::SyncEntity* UnwrapMutable(Wrapper* wrapper);
static void Swap(sync_pb::SyncEntity* t1, sync_pb::SyncEntity* t2);
typedef Immutable<sync_pb::SyncEntity, ImmutableSyncEntityTraits>
// Clears |entity|.
SyncData(int64 id, sync_pb::SyncEntity* entity);
// Whether this SyncData holds valid data.
bool is_valid_;
// Equal to kInvalidId iff this is local.
int64 id_;
// The actual shared sync entity being held.
ImmutableSyncEntity immutable_entity_;
// gmock printer helper.
void PrintTo(const SyncData& sync_data, std::ostream* os);
typedef std::vector<SyncData> SyncDataList;
} // namespace syncer