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
13namespace chromeos {
14
15// This interface provides access to Chrome OS system APIs such as the
16// timezone setting.
17class 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