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_SYSTEM_ACCESS_H_ 6 #define CHROME_BROWSER_CHROMEOS_SYSTEM_ACCESS_H_ 7 #pragma once 8 9 #include <string> 10 11 #include "unicode/timezone.h" 12 13 namespace chromeos { 14 15 // This interface provides access to Chrome OS system APIs such as the 16 // timezone setting. 17 class SystemAccess { 18 public: 19 class Observer { 20 public: 21 // Called when the timezone has changed. |timezone| is non-null. 22 virtual void TimezoneChanged(const icu::TimeZone& timezone) = 0; 23 }; 24 25 static SystemAccess* GetInstance(); 26 27 // Returns the current timezone as an icu::Timezone object. 28 virtual const icu::TimeZone& GetTimezone() = 0; 29 30 // Sets the current timezone. |timezone| must be non-null. 31 virtual void SetTimezone(const icu::TimeZone& timezone) = 0; 32 33 // Retrieve the named machine statistic (e.g. "hardware_class"). 34 // This does not update the statistcs. If the |name| is not set, |result| 35 // preserves old value. 36 virtual bool GetMachineStatistic(const std::string& name, 37 std::string* result) = 0; 38 39 virtual void AddObserver(Observer* observer) = 0; 40 virtual void RemoveObserver(Observer* observer) = 0; 41 42 protected: 43 virtual ~SystemAccess() {} 44 }; 45 46 } // namespace chromeos 47 48 #endif // CHROME_BROWSER_CHROMEOS_SYSTEM_ACCESS_H_ 49
