base/prefs/scoped_user_pref_update.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 "base/prefs/scoped_user_pref_update.h"
   6
   7 #include "base/logging.h"
   8 #include "base/prefs/pref_notifier.h"
   9 #include "base/prefs/pref_service.h"
  10
  11 namespace subtle {
  12
  13 ScopedUserPrefUpdateBase::ScopedUserPrefUpdateBase(PrefService* service,
  14                                                    const char* path)
  15     : service_(service),
  16       path_(path),
  17       value_(NULL) {}
  18
  19 ScopedUserPrefUpdateBase::~ScopedUserPrefUpdateBase() {
  20   Notify();
  21 }
  22
  23 Value* ScopedUserPrefUpdateBase::GetValueOfType(base::Value::Type type) {
  24   if (!value_)
  25     value_ = service_->GetMutableUserPref(path_.c_str(), type);
  26   return value_;
  27 }
  28
  29 void ScopedUserPrefUpdateBase::Notify() {
  30   if (value_) {
  31     service_->ReportUserPrefChanged(path_);
  32     value_ = NULL;
  33   }
  34 }
  35
  36 }  // namespace subtle