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// Copyright 2019 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 <memory>
#include "base/macros.h"
#include "base/optional.h"
#include "components/sync/model/conflict_resolution.h"
#include "components/sync/model/model_error.h"
namespace syncer {
struct EntityData;
// Interface implemented by Nigori model to receive Nigori updates from sync via
// a ModelTypeChangeProcessor. Provides a way for sync to update the data and
// metadata for Nigori entities, as well as the model type state.
class NigoriSyncBridge {
NigoriSyncBridge() = default;
virtual ~NigoriSyncBridge() = default;
// Perform the initial merge between local and sync data.
virtual base::Optional<ModelError> MergeSyncData(
base::Optional<EntityData> data) = 0;
// Apply changes from the sync server locally.
virtual base::Optional<ModelError> ApplySyncChanges(
base::Optional<EntityData> data) = 0;
// Retrieve Nigori sync data.
virtual std::unique_ptr<EntityData> GetData() = 0;
// Resolve a conflict between the client and server versions of data. They are
// guaranteed not to match (both be deleted or have identical specifics).
virtual ConflictResolution ResolveConflict(const EntityData& local_data,
const EntityData& remote_data) = 0;
// Informs the bridge that sync has been disabed. The bridge is responsible
// for deleting all data and metadata upon disabling sync.
virtual void ApplyDisableSyncChanges() = 0;
} // namespace syncer