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      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   DCHECK(service_->CalledOnValidThread());
     19 }
     20 
     21 ScopedUserPrefUpdateBase::~ScopedUserPrefUpdateBase() {
     22   Notify();
     23 }
     24 
     25 base::Value* ScopedUserPrefUpdateBase::GetValueOfType(base::Value::Type type) {
     26   DCHECK(CalledOnValidThread());
     27   if (!value_)
     28     value_ = service_->GetMutableUserPref(path_.c_str(), type);
     29   return value_;
     30 }
     31 
     32 void ScopedUserPrefUpdateBase::Notify() {
     33   if (value_) {
     34     service_->ReportUserPrefChanged(path_);
     35     value_ = NULL;
     36   }
     37 }
     38 
     39 }  // namespace subtle
     40