1 // Copyright (c) 2011 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 #ifndef CHROME_BROWSER_CHROMEOS_CROS_SETTINGS_H_ 6 #define CHROME_BROWSER_CHROMEOS_CROS_SETTINGS_H_ 7 #pragma once 8 9 #include <string> 10 #include <vector> 11 12 #include "base/hash_tables.h" 13 #include "base/memory/singleton.h" 14 #include "base/observer_list.h" 15 #include "base/threading/non_thread_safe.h" 16 #include "chrome/browser/chromeos/cros_settings_names.h" 17 #include "content/common/notification_observer.h" 18 19 namespace base { 20 template <typename T> struct DefaultLazyInstanceTraits; 21 } 22 23 class Value; 24 25 namespace chromeos { 26 27 class CrosSettingsProvider; 28 29 // A class manages per-device/global settings. 30 class CrosSettings : public base::NonThreadSafe { 31 public: 32 // Class factory. 33 static CrosSettings* Get(); 34 35 // Helper function to test if given path is a value cros settings name. 36 static bool IsCrosSettings(const std::string& path); 37 38 // Sets |in_value| to given |path| in cros settings. 39 // Note that this takes ownership of |in_value|. 40 void Set(const std::string& path, Value* in_value); 41 42 // Fires system setting change notification. 43 void FireObservers(const char* path); 44 45 // Gets settings value of given |path| to |out_value|. 46 // Note that the caller owns |out_value| returned. 47 bool Get(const std::string& path, Value** out_value) const; 48 49 // Convenience forms of Set(). These methods will replace any existing 50 // value at that path, even if it has a different type. 51 void SetBoolean(const std::string& path, bool in_value); 52 void SetInteger(const std::string& path, int in_value); 53 void SetDouble(const std::string& path, double in_value); 54 void SetString(const std::string& path, const std::string& in_value); 55 56 // These are convenience forms of Get(). The value will be retrieved 57 // and the return value will be true if the path is valid and the value at 58 // the end of the path can be returned in the form specified. 59 bool GetBoolean(const std::string& path, bool* out_value) const; 60 bool GetInteger(const std::string& path, int* out_value) const; 61 bool GetDouble(const std::string& path, double* out_value) const; 62 bool GetString(const std::string& path, std::string* out_value) const; 63 64 // adding/removing of providers 65 bool AddSettingsProvider(CrosSettingsProvider* provider); 66 bool RemoveSettingsProvider(CrosSettingsProvider* provider); 67 68 // If the pref at the given path changes, we call the observer's Observe 69 // method with PREF_CHANGED. 70 void AddSettingsObserver(const char* path, NotificationObserver* obs); 71 void RemoveSettingsObserver(const char* path, NotificationObserver* obs); 72 73 private: 74 // List of ChromeOS system settings providers. 75 std::vector<CrosSettingsProvider*> providers_; 76 77 // A map from settings names to a list of observers. Observers get fired in 78 // the order they are added. 79 typedef ObserverList<NotificationObserver> NotificationObserverList; 80 typedef base::hash_map<std::string, NotificationObserverList*> 81 SettingsObserverMap; 82 SettingsObserverMap settings_observers_; 83 84 CrosSettings(); 85 ~CrosSettings(); 86 CrosSettingsProvider* GetProvider(const std::string& path) const; 87 friend struct base::DefaultLazyInstanceTraits<CrosSettings>; 88 89 DISALLOW_COPY_AND_ASSIGN(CrosSettings); 90 }; 91 92 } // namespace chromeos 93 94 #endif // CHROME_BROWSER_CHROMEOS_CROS_SETTINGS_H_ 95