[Sync] Move //sync to //components/sync.

sync/engine/directory_update_handler.h

-// Copyright 2014 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 SYNC_ENGINE_DIRECTORY_UPDATE_HANDLER_H_
-#define SYNC_ENGINE_DIRECTORY_UPDATE_HANDLER_H_
-
-#include <map>
-#include <memory>
-
-#include "base/macros.h"
-#include "base/memory/ref_counted.h"
-#include "sync/base/sync_export.h"
-#include "sync/engine/process_updates_util.h"
-#include "sync/engine/update_handler.h"
-#include "sync/internal_api/public/base/model_type.h"
-#include "sync/internal_api/public/util/syncer_error.h"
-
-namespace sync_pb {
-class DataTypeProgressMarker;
-class GarbageCollectionDirective;
-class GetUpdatesResponse;
-}
-
-namespace syncer {
-
-namespace sessions {
-class StatusController;
-}
-
-namespace syncable {
-class Directory;
-}
-
-class DirectoryTypeDebugInfoEmitter;
-class ModelSafeWorker;
-
-// This class represents the syncable::Directory's processes for requesting and
-// processing updates from the sync server.
-//
-// Each instance of this class represents a particular type in the
-// syncable::Directory.  It can store and retreive that type's progress markers.
-// It can also process a set of received SyncEntities and store their data.
-class SYNC_EXPORT DirectoryUpdateHandler : public UpdateHandler {
- public:
-  DirectoryUpdateHandler(syncable::Directory* dir,
-                         ModelType type,
-                         scoped_refptr<ModelSafeWorker> worker,
-                         DirectoryTypeDebugInfoEmitter* debug_info_emitter);
-  ~DirectoryUpdateHandler() override;
-
-  // UpdateHandler implementation.
-  bool IsInitialSyncEnded() const override;
-  void GetDownloadProgress(
-      sync_pb::DataTypeProgressMarker* progress_marker) const override;
-  void GetDataTypeContext(sync_pb::DataTypeContext* context) const override;
-  SyncerError ProcessGetUpdatesResponse(
-      const sync_pb::DataTypeProgressMarker& progress_marker,
-      const sync_pb::DataTypeContext& mutated_context,
-      const SyncEntityList& applicable_updates,
-      sessions::StatusController* status) override;
-  void ApplyUpdates(sessions::StatusController* status) override;
-  void PassiveApplyUpdates(sessions::StatusController* status) override;
-
- private:
-  friend class DirectoryUpdateHandlerApplyUpdateTest;
-  friend class DirectoryUpdateHandlerProcessUpdateTest;
-
-  // Sometimes there is nothing to do, so we can return without doing anything.
-  bool IsApplyUpdatesRequired();
-
-  // Called at the end of ApplyUpdates and PassiveApplyUpdates and performs
-  // steps common to both (even when IsApplyUpdatesRequired has returned
-  // false).
-  void PostApplyUpdates();
-
-  // Processes the given SyncEntities and stores their data in the directory.
-  // Their types must match this update handler's type.
-  void UpdateSyncEntities(
-      syncable::ModelNeutralWriteTransaction* trans,
-      const SyncEntityList& applicable_updates,
-      sessions::StatusController* status);
-
-  // Expires entries according to GC directives.
-  void ExpireEntriesIfNeeded(
-      syncable::ModelNeutralWriteTransaction* trans,
-      const sync_pb::DataTypeProgressMarker& progress_marker);
-
-  // Stores the given progress marker in the directory.
-  // Its type must match this update handler's type.
-  void UpdateProgressMarker(
-      const sync_pb::DataTypeProgressMarker& progress_marker);
-
-  bool IsValidProgressMarker(
-      const sync_pb::DataTypeProgressMarker& progress_marker) const;
-
-  // Skips all checks and goes straight to applying the updates.
-  SyncerError ApplyUpdatesImpl(sessions::StatusController* status);
-
-  // Creates root node for the handled model type.
-  void CreateTypeRoot(syncable::ModelNeutralWriteTransaction* trans);
-
-  syncable::Directory* dir_;
-  ModelType type_;
-  scoped_refptr<ModelSafeWorker> worker_;
-  DirectoryTypeDebugInfoEmitter* debug_info_emitter_;
-
-  std::unique_ptr<sync_pb::GarbageCollectionDirective> cached_gc_directive_;
-
-  DISALLOW_COPY_AND_ASSIGN(DirectoryUpdateHandler);
-};
-
-}  // namespace syncer
-
-#endif  // SYNC_ENGINE_DIRECTORY_UPDATE_HANDLER_H_