1 // Copyright 2010 The Chromium Authors
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/prefs/pref_change_registrar.h"
6
7 #include <ostream>
8
9 #include "base/check.h"
10 #include "base/functional/bind.h"
11 #include "base/notreached.h"
12 #include "components/prefs/pref_service.h"
13
PrefChangeRegistrar()14 PrefChangeRegistrar::PrefChangeRegistrar() : service_(nullptr) {}
15
~PrefChangeRegistrar()16 PrefChangeRegistrar::~PrefChangeRegistrar() {
17 // If you see an invalid memory access in this destructor, this
18 // PrefChangeRegistrar might be subscribed to an OffTheRecordProfileImpl that
19 // has been destroyed. This should not happen any more but be warned.
20 // Feel free to contact [email protected] in case this happens.
21 //
22 // This can also happen for non-OTR profiles, when the
23 // DestroyProfileOnBrowserClose flag is enabled. In that case, contact
24 // [email protected].
25 RemoveAll();
26 }
27
Init(PrefService * service)28 void PrefChangeRegistrar::Init(PrefService* service) {
29 DCHECK(IsEmpty() || service_ == service);
30 service_ = service;
31 }
32
Reset()33 void PrefChangeRegistrar::Reset() {
34 RemoveAll();
35 service_ = nullptr;
36 }
37
Add(const std::string & path,const base::RepeatingClosure & obs)38 void PrefChangeRegistrar::Add(const std::string& path,
39 const base::RepeatingClosure& obs) {
40 Add(path,
41 base::BindRepeating(&PrefChangeRegistrar::InvokeUnnamedCallback, obs));
42 }
43
Add(const std::string & path,const NamedChangeCallback & obs)44 void PrefChangeRegistrar::Add(const std::string& path,
45 const NamedChangeCallback& obs) {
46 if (!service_) {
47 NOTREACHED();
48 return;
49 }
50 DCHECK(!IsObserved(path)) << "Already had pref, \"" << path
51 << "\", registered.";
52
53 service_->AddPrefObserver(path, this);
54 observers_[path] = obs;
55 }
56
Remove(const std::string & path)57 void PrefChangeRegistrar::Remove(const std::string& path) {
58 DCHECK(IsObserved(path));
59
60 observers_.erase(path);
61 service_->RemovePrefObserver(path, this);
62 }
63
RemoveAll()64 void PrefChangeRegistrar::RemoveAll() {
65 for (ObserverMap::const_iterator it = observers_.begin();
66 it != observers_.end(); ++it) {
67 service_->RemovePrefObserver(it->first, this);
68 }
69
70 observers_.clear();
71 }
72
IsEmpty() const73 bool PrefChangeRegistrar::IsEmpty() const {
74 return observers_.empty();
75 }
76
IsObserved(const std::string & pref)77 bool PrefChangeRegistrar::IsObserved(const std::string& pref) {
78 return observers_.find(pref) != observers_.end();
79 }
80
OnPreferenceChanged(PrefService * service,const std::string & pref)81 void PrefChangeRegistrar::OnPreferenceChanged(PrefService* service,
82 const std::string& pref) {
83 if (IsObserved(pref))
84 observers_[pref].Run(pref);
85 }
86
InvokeUnnamedCallback(const base::RepeatingClosure & callback,const std::string & pref_name)87 void PrefChangeRegistrar::InvokeUnnamedCallback(
88 const base::RepeatingClosure& callback,
89 const std::string& pref_name) {
90 callback.Run();
91 }
92
prefs()93 PrefService* PrefChangeRegistrar::prefs() {
94 return service_;
95 }
96
prefs() const97 const PrefService* PrefChangeRegistrar::prefs() const {
98 return service_;
99 }
100