1// Copyright (c) 2010 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 "chrome/browser/prefs/pref_change_registrar.h"
6
7#include "base/logging.h"
8#include "chrome/browser/prefs/pref_service.h"
9
10PrefChangeRegistrar::PrefChangeRegistrar() : service_(NULL) {}
11
12PrefChangeRegistrar::~PrefChangeRegistrar() {
13  // If you see an invalid memory access in this destructor, this
14  // PrefChangeRegistrar might be subscribed to an OffTheRecordProfileImpl that
15  // has been destroyed. This should not happen any more but be warned.
16  // Feel free to contact battre@chromium.org in case this happens.
17  RemoveAll();
18}
19
20void PrefChangeRegistrar::Init(PrefService* service) {
21  DCHECK(IsEmpty() || service_ == service);
22  service_ = service;
23}
24
25void PrefChangeRegistrar::Add(const char* path, NotificationObserver* obs) {
26  if (!service_) {
27    NOTREACHED();
28    return;
29  }
30  ObserverRegistration registration(path, obs);
31  if (observers_.find(registration) != observers_.end()) {
32    NOTREACHED();
33    return;
34  }
35  observers_.insert(registration);
36  service_->AddPrefObserver(path, obs);
37}
38
39void PrefChangeRegistrar::Remove(const char* path, NotificationObserver* obs) {
40  if (!service_) {
41    NOTREACHED();
42    return;
43  }
44  ObserverRegistration registration(path, obs);
45  std::set<ObserverRegistration>::iterator it =
46       observers_.find(registration);
47  if (it == observers_.end()) {
48    NOTREACHED();
49    return;
50  }
51  service_->RemovePrefObserver(it->first.c_str(), it->second);
52  observers_.erase(it);
53}
54
55void PrefChangeRegistrar::RemoveAll() {
56  if (service_) {
57    for (std::set<ObserverRegistration>::const_iterator it = observers_.begin();
58         it != observers_.end(); ++it) {
59      service_->RemovePrefObserver(it->first.c_str(), it->second);
60    }
61    observers_.clear();
62  }
63}
64
65bool PrefChangeRegistrar::IsEmpty() const {
66  return observers_.empty();
67}
68