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      1 // Copyright (c) 2012 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_COMMON_EXTENSIONS_FEATURE_SWITCH_H_
      6 #define CHROME_COMMON_EXTENSIONS_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* script_badges();
     22   static FeatureSwitch* script_bubble();
     23   static FeatureSwitch* prompt_for_external_extensions();
     24   static FeatureSwitch* tab_capture();
     25 
     26   enum DefaultValue {
     27     DEFAULT_ENABLED,
     28     DEFAULT_DISABLED
     29   };
     30 
     31   enum OverrideValue {
     32     OVERRIDE_NONE,
     33     OVERRIDE_ENABLED,
     34     OVERRIDE_DISABLED
     35   };
     36 
     37   // A temporary override for the switch value.
     38   class ScopedOverride {
     39    public:
     40     ScopedOverride(FeatureSwitch* feature, bool override_value);
     41     ~ScopedOverride();
     42    private:
     43     FeatureSwitch* feature_;
     44     FeatureSwitch::OverrideValue previous_value_;
     45     DISALLOW_COPY_AND_ASSIGN(ScopedOverride);
     46   };
     47 
     48   FeatureSwitch(const char* switch_name,
     49                 DefaultValue default_value);
     50   FeatureSwitch(const CommandLine* command_line,
     51                 const char* switch_name,
     52                 DefaultValue default_value);
     53 
     54   // Consider using ScopedOverride instead.
     55   void SetOverrideValue(OverrideValue value);
     56   OverrideValue GetOverrideValue() const;
     57 
     58   bool IsEnabled() const;
     59 
     60   std::string GetLegacyEnableFlag() const;
     61   std::string GetLegacyDisableFlag() const;
     62 
     63  private:
     64   void Init(const CommandLine* command_line,
     65             const char* switch_name,
     66             DefaultValue default_value);
     67 
     68   const CommandLine* command_line_;
     69   const char* switch_name_;
     70   bool default_value_;
     71   OverrideValue override_value_;
     72 
     73   DISALLOW_COPY_AND_ASSIGN(FeatureSwitch);
     74 };
     75 
     76 }  // namespace extensions
     77 
     78 #endif  // CHROME_COMMON_EXTENSIONS_FEATURE_SWITCH_H_
     79