components/syncable_prefs/synced_pref_change_registrar.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 "components/syncable_prefs/synced_pref_change_registrar.h"
   6
   7 #include "base/bind.h"
   8
   9 namespace syncable_prefs {
  10
  11 namespace {
  12
  13 void InvokeUnnamedCallback(
  14     const SyncedPrefChangeRegistrar::ChangeCallback& callback,
  15     const std::string& path,
  16     bool from_sync) {
  17   callback.Run(from_sync);
  18 }
  19
  20 }  // namespace
  21
  22 SyncedPrefChangeRegistrar::SyncedPrefChangeRegistrar(
  23     PrefServiceSyncable* pref_service) {
  24   pref_service_ = pref_service;
  25 }
  26
  27 SyncedPrefChangeRegistrar::~SyncedPrefChangeRegistrar() {
  28   RemoveAll();
  29 }
  30
  31 void SyncedPrefChangeRegistrar::Add(const char *path,
  32                                     const ChangeCallback& callback) {
  33   Add(path, base::Bind(InvokeUnnamedCallback, callback));
  34 }
  35
  36 void SyncedPrefChangeRegistrar::Add(const char *path,
  37                                     const NamedChangeCallback& callback) {
  38   DCHECK(!IsObserved(path));
  39   observers_[path] = callback;
  40   pref_service_->AddSyncedPrefObserver(path, this);
  41 }
  42
  43 void SyncedPrefChangeRegistrar::Remove(const char *path) {
  44   observers_.erase(path);
  45   pref_service_->RemoveSyncedPrefObserver(path, this);
  46 }
  47
  48 void SyncedPrefChangeRegistrar::RemoveAll() {
  49   for (ObserverMap::iterator iter = observers_.begin();
  50        iter != observers_.end(); ++iter) {
  51     pref_service_->RemoveSyncedPrefObserver(iter->first, this);
  52   }
  53   observers_.clear();
  54 }
  55
  56 bool SyncedPrefChangeRegistrar::IsObserved(const char* path) const {
  57   return observers_.find(path) != observers_.end();
  58 }
  59
  60 void SyncedPrefChangeRegistrar::OnSyncedPrefChanged(const std::string& path,
  61                                                     bool from_sync) {
  62   if (pref_service_->IsManagedPreference(path.c_str()))
  63     return;
  64   ObserverMap::const_iterator iter = observers_.find(path);
  65   if (iter == observers_.end())
  66     return;
  67   iter->second.Run(path, from_sync);
  68 }
  69
  70 }  // namespace syncable_prefs