1// Copyright (c) 2014 The Chromium Authors. All rights reserved.
2// Use of this source code is governed by a BSD-style license that can be
3// found in the LICENSE file.
4
5#ifndef CHROME_BROWSER_PREFS_BROWSER_UI_PREFS_MIGRATOR_H_
6#define CHROME_BROWSER_PREFS_BROWSER_UI_PREFS_MIGRATOR_H_
7
8#include "base/memory/scoped_ptr.h"
9#include "base/prefs/pref_store.h"
10#include "base/prefs/writeable_pref_store.h"
11
12// When prefs are loaded from disk this class migrates some previously
13// dynamically registered preferences to their new home in a statically
14// registered dictionary. It can't follow the usual migration pattern because
15// it is migrating preferences that aren't registered at migration time and has
16// to iterate over a raw DictionaryValue looking for keys to migrate.
17//
18// Objects of this class delete themselves after the migration.
19//
20// TODO(dgrogan): Delete this for m41. See http://crbug.com/167256.
21
22class BrowserUIPrefsMigrator : public PrefStore::Observer {
23 public:
24  explicit BrowserUIPrefsMigrator(WriteablePrefStore* pref_store);
25
26  // Overrides from PrefStore::Observer.
27  virtual void OnPrefValueChanged(const std::string& key) OVERRIDE {}
28  virtual void OnInitializationCompleted(bool succeeded) OVERRIDE;
29
30 private:
31  friend struct base::DefaultDeleter<BrowserUIPrefsMigrator>;
32
33  virtual ~BrowserUIPrefsMigrator();
34
35  WriteablePrefStore* pref_store_;
36
37  DISALLOW_COPY_AND_ASSIGN(BrowserUIPrefsMigrator);
38};
39
40#endif  // CHROME_BROWSER_PREFS_BROWSER_UI_PREFS_MIGRATOR_H_
41