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#ifndef EXTENSIONS_COMMON_FEATURE_SWITCH_H_
6#define EXTENSIONS_COMMON_FEATURE_SWITCH_H_
7
8#include <string>
9
10#include "base/basictypes.h"
11
12namespace base {
13class CommandLine;
14}
15
16namespace extensions {
17
18// A switch that can turn a feature on or off. Typically controlled via
19// command-line switches but can be overridden, e.g., for testing.
20class FeatureSwitch {
21 public:
22  static FeatureSwitch* easy_off_store_install();
23  static FeatureSwitch* force_dev_mode_highlighting();
24  static FeatureSwitch* prompt_for_external_extensions();
25  static FeatureSwitch* error_console();
26  static FeatureSwitch* enable_override_bookmarks_ui();
27  static FeatureSwitch* extension_action_redesign();
28  static FeatureSwitch* scripts_require_action();
29  static FeatureSwitch* embedded_extension_options();
30  static FeatureSwitch* app_view();
31  static FeatureSwitch* mime_handler_view();
32
33  enum DefaultValue {
34    DEFAULT_ENABLED,
35    DEFAULT_DISABLED
36  };
37
38  enum OverrideValue {
39    OVERRIDE_NONE,
40    OVERRIDE_ENABLED,
41    OVERRIDE_DISABLED
42  };
43
44  // A temporary override for the switch value.
45  class ScopedOverride {
46   public:
47    ScopedOverride(FeatureSwitch* feature, bool override_value);
48    ~ScopedOverride();
49   private:
50    FeatureSwitch* feature_;
51    FeatureSwitch::OverrideValue previous_value_;
52    DISALLOW_COPY_AND_ASSIGN(ScopedOverride);
53  };
54
55  // |switch_name| can be NULL, in which case the feature is controlled solely
56  // by the default and override values.
57  FeatureSwitch(const char* switch_name,
58                DefaultValue default_value);
59  FeatureSwitch(const base::CommandLine* command_line,
60                const char* switch_name,
61                DefaultValue default_value);
62
63  // Consider using ScopedOverride instead.
64  void SetOverrideValue(OverrideValue value);
65  OverrideValue GetOverrideValue() const;
66
67  bool IsEnabled() const;
68
69 private:
70  void Init(const base::CommandLine* command_line,
71            const char* switch_name,
72            DefaultValue default_value);
73
74  std::string GetLegacyEnableFlag() const;
75  std::string GetLegacyDisableFlag() const;
76
77  const base::CommandLine* command_line_;
78  const char* switch_name_;
79  bool default_value_;
80  OverrideValue override_value_;
81
82  DISALLOW_COPY_AND_ASSIGN(FeatureSwitch);
83};
84
85}  // namespace extensions
86
87#endif  // EXTENSIONS_COMMON_FEATURE_SWITCH_H_
88