components/user_prefs/user_prefs.cc

   1 // Copyright 2013 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 #include "components/user_prefs/user_prefs.h"
   6
   7 #include "base/logging.h"
   8 #include "base/memory/singleton.h"
   9 #include "base/prefs/pref_service.h"
  10
  11 namespace user_prefs {
  12
  13 namespace {
  14
  15 void* UserDataKey() {
  16   // We just need a unique constant. Use the address of a static that
  17   // COMDAT folding won't touch in an optimizing linker.
  18   static int data_key = 0;
  19   return reinterpret_cast<void*>(&data_key);
  20 }
  21
  22 }  // namespace
  23
  24 // static
  25 PrefService* UserPrefs::Get(base::SupportsUserData* context) {
  26   DCHECK(context);
  27   DCHECK(context->GetUserData(UserDataKey()));
  28   return static_cast<UserPrefs*>(
  29       context->GetUserData(UserDataKey()))->prefs_;
  30 }
  31
  32 // static
  33 void UserPrefs::Set(base::SupportsUserData* context, PrefService* prefs) {
  34   DCHECK(context);
  35   DCHECK(prefs);
  36   DCHECK(!context->GetUserData(UserDataKey()));
  37   context->SetUserData(UserDataKey(), new UserPrefs(prefs));
  38 }
  39
  40 UserPrefs::UserPrefs(PrefService* prefs) : prefs_(prefs) {
  41 }
  42
  43 UserPrefs::~UserPrefs() {
  44 }
  45
  46 }  // namespace user_prefs