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// Copyright (c) 2011 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 CHROME_BROWSER_EXTENSIONS_SYNCABLE_EXTENSION_SETTINGS_STORAGE_H_
#define CHROME_BROWSER_EXTENSIONS_SYNCABLE_EXTENSION_SETTINGS_STORAGE_H_
#pragma once
#include "base/compiler_specific.h"
#include "base/memory/weak_ptr.h"
#include "base/values.h"
#include "chrome/browser/extensions/extension_settings_storage.h"
#include "chrome/browser/extensions/extension_setting_sync_data.h"
#include "chrome/browser/sync/api/syncable_service.h"
#include "chrome/browser/sync/api/sync_change.h"
// Decorates an ExtensionSettingsStorage with sync behaviour.
class SyncableExtensionSettingsStorage : public ExtensionSettingsStorage {
public:
explicit SyncableExtensionSettingsStorage(
std::string extension_id,
// Ownership taken.
ExtensionSettingsStorage* delegate);
virtual ~SyncableExtensionSettingsStorage();
// ExtensionSettingsStorage implementation.
virtual Result Get(const std::string& key) OVERRIDE;
virtual Result Get(const std::vector<std::string>& keys) OVERRIDE;
virtual Result Get() OVERRIDE;
virtual Result Set(const std::string& key, const Value& value) OVERRIDE;
virtual Result Set(const DictionaryValue& settings) OVERRIDE;
virtual Result Remove(const std::string& key) OVERRIDE;
virtual Result Remove(const std::vector<std::string>& keys) OVERRIDE;
virtual Result Clear() OVERRIDE;
// Sync-related methods, analogous to those on SyncableService (handled by
// ExtensionSettings).
SyncError StartSyncing(
const DictionaryValue& sync_state,
// Must NOT be NULL. Ownership NOT taken.
SyncChangeProcessor* sync_processor);
void StopSyncing();
std::vector<SyncError> ProcessSyncChanges(
const ExtensionSettingSyncDataList& sync_changes);
private:
// Either adds to sync or send updates to sync for some settings.
// Whether they're adds or updates depends on the state of |synced_keys_|.
void SendAddsOrUpdatesToSync(
const std::set<std::string>& changed_keys,
const DictionaryValue& settings);
// Sends deletes to sync for some settings.
void SendDeletesToSync(const std::set<std::string>& keys);
// Sends all local settings to sync (synced settings assumed to be empty).
SyncError SendLocalSettingsToSync(
const DictionaryValue& settings);
// Overwrites local state with sync state.
SyncError OverwriteLocalSettingsWithSync(
const DictionaryValue& sync_state, const DictionaryValue& settings);
// Id of the extension these settings are for.
std::string const extension_id_;
// Storage area to sync.
const scoped_ptr<ExtensionSettingsStorage> delegate_;
// Sync processor. Non-NULL while sync is enabled (between calls to
// StartSyncing and StopSyncing).
SyncChangeProcessor* sync_processor_;
// Keys of the settings that are currently being synced.
std::set<std::string> synced_keys_;
DISALLOW_COPY_AND_ASSIGN(SyncableExtensionSettingsStorage);
};
#endif // CHROME_BROWSER_EXTENSIONS_SYNCABLE_EXTENSION_SETTINGS_STORAGE_H_
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