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