chrome/browser/search/hotword_audio_history_handler.h

   1 // Copyright 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_SEARCH_HOTWORD_AUDIO_HISTORY_HANDLER_H_
   6 #define CHROME_BROWSER_SEARCH_HOTWORD_AUDIO_HISTORY_HANDLER_H_
   7
   8 #include "base/memory/ref_counted.h"
   9 #include "base/memory/weak_ptr.h"
  10 #include "base/prefs/pref_change_registrar.h"
  11 #include "content/public/browser/browser_context.h"
  12
  13 class Profile;
  14
  15 namespace base {
  16 class SingleThreadTaskRunner;
  17 }
  18
  19 namespace history {
  20 class WebHistoryService;
  21 }
  22
  23 // A class which handles the audio history pref for hotwording. This has been
  24 // pulled into its own class in order to transparently (to the rest of
  25 // hotwording) handle changing user global pref management systems.
  26 class HotwordAudioHistoryHandler {
  27  public:
  28   typedef base::Callback<void(bool success, bool new_enabled_value)>
  29       HotwordAudioHistoryCallback;
  30
  31   HotwordAudioHistoryHandler(
  32       content::BrowserContext* context,
  33       const scoped_refptr<base::SingleThreadTaskRunner>& task_runner);
  34
  35   virtual ~HotwordAudioHistoryHandler();
  36
  37   // Initiates a call to get the updated audio history state.
  38   void UpdateAudioHistoryState();
  39
  40   // Updates the current preference value based on the user's account info
  41   // or false if the user is not signed in.
  42   virtual void GetAudioHistoryEnabled(
  43       const HotwordAudioHistoryCallback& callback);
  44
  45   // Sets the user's global pref value for enabling audio history.
  46   void SetAudioHistoryEnabled(const bool enabled,
  47                               const HotwordAudioHistoryCallback& callback);
  48
  49   // This helper function is made public for testing.
  50   virtual history::WebHistoryService* GetWebHistory();
  51
  52  private:
  53   // Helper function used as a callback and to factor out common code.
  54   void UpdateLocalPreference(bool success, bool new_enabled_value);
  55
  56   // Called upon completion of web history->GetAudioHistoryEnabled.
  57   void GetAudioHistoryComplete(
  58       const HotwordAudioHistoryCallback& callback,
  59       bool success,
  60       bool new_enabled_value);
  61
  62   // Called upon completion of web history->SetAudioHistoryEnabled.
  63   // |new_enabled_value| is the desired value of the preference.
  64   // |callback_enabled_value| should not be considered valid.
  65   void SetAudioHistoryComplete(
  66       bool new_enabled_value,
  67       const HotwordAudioHistoryCallback& callback,
  68       bool success,
  69       bool callback_enabled_value);
  70
  71   scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
  72
  73   Profile* profile_;
  74
  75   base::WeakPtrFactory<HotwordAudioHistoryHandler> weak_ptr_factory_;
  76
  77   DISALLOW_COPY_AND_ASSIGN(HotwordAudioHistoryHandler);
  78 };
  79
  80 #endif  // CHROME_BROWSER_SEARCH_HOTWORD_AUDIO_HISTORY_HANDLER_H_