extensions/common/feature_switch.h

   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
  12 class CommandLine;
  13
  14 namespace extensions {
  15
  16 // A switch that can turn a feature on or off. Typically controlled via
  17 // command-line switches but can be overridden, e.g., for testing.
  18 class FeatureSwitch {
  19  public:
  20   static FeatureSwitch* easy_off_store_install();
  21   static FeatureSwitch* force_dev_mode_highlighting();
  22   static FeatureSwitch* global_commands();
  23   static FeatureSwitch* prompt_for_external_extensions();
  24   static FeatureSwitch* error_console();
  25   static FeatureSwitch* enable_override_bookmarks_ui();
  26
  27   enum DefaultValue {
  28     DEFAULT_ENABLED,
  29     DEFAULT_DISABLED
  30   };
  31
  32   enum OverrideValue {
  33     OVERRIDE_NONE,
  34     OVERRIDE_ENABLED,
  35     OVERRIDE_DISABLED
  36   };
  37
  38   // A temporary override for the switch value.
  39   class ScopedOverride {
  40    public:
  41     ScopedOverride(FeatureSwitch* feature, bool override_value);
  42     ~ScopedOverride();
  43    private:
  44     FeatureSwitch* feature_;
  45     FeatureSwitch::OverrideValue previous_value_;
  46     DISALLOW_COPY_AND_ASSIGN(ScopedOverride);
  47   };
  48
  49   FeatureSwitch(const char* switch_name,
  50                 DefaultValue default_value);
  51   FeatureSwitch(const CommandLine* command_line,
  52                 const char* switch_name,
  53                 DefaultValue default_value);
  54
  55   // Consider using ScopedOverride instead.
  56   void SetOverrideValue(OverrideValue value);
  57   OverrideValue GetOverrideValue() const;
  58
  59   bool IsEnabled() const;
  60
  61   std::string GetLegacyEnableFlag() const;
  62   std::string GetLegacyDisableFlag() const;
  63
  64  private:
  65   void Init(const CommandLine* command_line,
  66             const char* switch_name,
  67             DefaultValue default_value);
  68
  69   const CommandLine* command_line_;
  70   const char* switch_name_;
  71   bool default_value_;
  72   OverrideValue override_value_;
  73
  74   DISALLOW_COPY_AND_ASSIGN(FeatureSwitch);
  75 };
  76
  77 }  // namespace extensions
  78
  79 #endif  // EXTENSIONS_COMMON_FEATURE_SWITCH_H_