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// 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 CHROME_BROWSER_PREFS_TRACKED_PREF_SERVICE_HASH_STORE_CONTENTS_H_
#define CHROME_BROWSER_PREFS_TRACKED_PREF_SERVICE_HASH_STORE_CONTENTS_H_
#include <string>
#include "base/compiler_specific.h"
#include "base/macros.h"
#include "chrome/browser/prefs/tracked/hash_store_contents.h"
class PrefRegistrySimple;
class PrefService;
// Implements HashStoreContents by storing hashes in a PrefService. Multiple
// separate hash stores may coexist in the PrefService by using distinct hash
// store IDs.
// TODO(erikwright): This class is only used to recreate preference state as in
// M35, to test migration behaviour. Remove this class when
// ProfilePrefStoreManagerTest no longer depends on it.
class PrefServiceHashStoreContents : public HashStoreContents {
public:
// Constructs a HashStoreContents that stores hashes in |pref_service|.
// Multiple hash stores can use the same |pref_service| with distinct
// |hash_store_id|s.
//
// |pref_service| must have previously been configured using |RegisterPrefs|.
PrefServiceHashStoreContents(const std::string& hash_store_id,
PrefService* pref_service);
// A dictionary pref which maps profile names to dictionary values which hold
// hashes of profile prefs that we track to detect changes that happen outside
// of Chrome.
static const char kProfilePreferenceHashes[];
// The name of a dict that is stored as a child of
// |prefs::kProfilePreferenceHashes|. Each child node is a string whose name
// is a hash store ID and whose value is the super MAC for the corresponding
// hash store.
static const char kHashOfHashesDict[];
// The name of a dict that is stored as a child of
// |prefs::kProfilePreferenceHashes|. Each child node is a number whose name
// is a hash store ID and whose value is the version of the corresponding
// hash store.
static const char kStoreVersionsDict[];
// Registers required preferences.
static void RegisterPrefs(PrefRegistrySimple* registry);
// Deletes stored hashes for all profiles from |pref_service|.
static void ResetAllPrefHashStores(PrefService* pref_service);
// HashStoreContents implementation
virtual std::string hash_store_id() const OVERRIDE;
virtual void Reset() OVERRIDE;
virtual bool IsInitialized() const OVERRIDE;
virtual const base::DictionaryValue* GetContents() const OVERRIDE;
virtual scoped_ptr<MutableDictionary> GetMutableContents() OVERRIDE;
virtual std::string GetSuperMac() const OVERRIDE;
virtual void SetSuperMac(const std::string& super_mac) OVERRIDE;
private:
const std::string hash_store_id_;
PrefService* pref_service_;
DISALLOW_COPY_AND_ASSIGN(PrefServiceHashStoreContents);
};
#endif // CHROME_BROWSER_PREFS_TRACKED_PREF_SERVICE_HASH_STORE_CONTENTS_H_