// Copyright (c) 2010 The Chromium Authors. All rights reserved. // Use of this source code is governed by a BSD-style license that can be // found in the LICENSE file. #ifndef CHROME_BROWSER_PREFS_PREF_NOTIFIER_IMPL_H_ #define CHROME_BROWSER_PREFS_PREF_NOTIFIER_IMPL_H_ #pragma once #include <string> #include "base/hash_tables.h" #include "base/observer_list.h" #include "base/threading/non_thread_safe.h" #include "chrome/browser/prefs/pref_notifier.h" class PrefService; class NotificationObserver; // The PrefNotifier implementation used by the PrefService. class PrefNotifierImpl : public PrefNotifier, public base::NonThreadSafe { public: explicit PrefNotifierImpl(PrefService* pref_service); virtual ~PrefNotifierImpl(); // If the pref at the given path changes, we call the observer's Observe // method with PREF_CHANGED. void AddPrefObserver(const char* path, NotificationObserver* obs); void RemovePrefObserver(const char* path, NotificationObserver* obs); // PrefNotifier overrides. virtual void OnPreferenceChanged(const std::string& pref_name); virtual void OnInitializationCompleted(); protected: // A map from pref names to a list of observers. Observers get fired in the // order they are added. These should only be accessed externally for unit // testing. typedef ObserverList<NotificationObserver> NotificationObserverList; typedef base::hash_map<std::string, NotificationObserverList*> PrefObserverMap; const PrefObserverMap* pref_observers() const { return &pref_observers_; } private: // For the given pref_name, fire any observer of the pref. Virtual so it can // be mocked for unit testing. virtual void FireObservers(const std::string& path); // Weak reference; the notifier is owned by the PrefService. PrefService* pref_service_; PrefObserverMap pref_observers_; DISALLOW_COPY_AND_ASSIGN(PrefNotifierImpl); }; #endif // CHROME_BROWSER_PREFS_PREF_NOTIFIER_IMPL_H_