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      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 namespace base {
     13 class CommandLine;
     14 }
     15 
     16 namespace 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.
     20 class 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