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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 
ScopedUserPrefUpdateBase(PrefService * service,const char * path)13 ScopedUserPrefUpdateBase::ScopedUserPrefUpdateBase(PrefService* service,
14                                                    const char* path)
15     : service_(service),
16       path_(path),
17       value_(NULL) {
18   DCHECK(service_->CalledOnValidThread());
19 }
20 
~ScopedUserPrefUpdateBase()21 ScopedUserPrefUpdateBase::~ScopedUserPrefUpdateBase() {
22   Notify();
23 }
24 
GetValueOfType(base::Value::Type type)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 
Notify()32 void ScopedUserPrefUpdateBase::Notify() {
33   if (value_) {
34     service_->ReportUserPrefChanged(path_);
35     value_ = NULL;
36   }
37 }
38 
39 }  // namespace subtle
40