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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_FEATURES_BASE_FEATURE_PROVIDER_H_
      6 #define CHROME_COMMON_EXTENSIONS_FEATURES_BASE_FEATURE_PROVIDER_H_
      7 
      8 #include <map>
      9 #include <string>
     10 #include <vector>
     11 
     12 #include "base/memory/linked_ptr.h"
     13 #include "base/values.h"
     14 #include "chrome/common/extensions/features/simple_feature.h"
     15 #include "extensions/common/features/feature_provider.h"
     16 
     17 namespace extensions {
     18 
     19 // Reads Features out of a simple JSON file description.
     20 class BaseFeatureProvider : public FeatureProvider {
     21  public:
     22   typedef SimpleFeature*(*FeatureFactory)();
     23 
     24   // Creates a new BaseFeatureProvider. Pass null to |factory| to have the
     25   // provider create plain old Feature instances.
     26   BaseFeatureProvider(const base::DictionaryValue& root,
     27                       FeatureFactory factory);
     28   virtual ~BaseFeatureProvider();
     29 
     30   // Gets a feature provider for a specific feature type, like "permission".
     31   static FeatureProvider* GetByName(const std::string& name);
     32 
     33   // Gets the feature |feature_name|, if it exists.
     34   virtual Feature* GetFeature(const std::string& feature_name) OVERRIDE;
     35   virtual Feature* GetParent(Feature* feature) OVERRIDE;
     36 
     37   virtual const std::vector<std::string>& GetAllFeatureNames() OVERRIDE;
     38 
     39  private:
     40   typedef std::map<std::string, linked_ptr<Feature> > FeatureMap;
     41   FeatureMap features_;
     42 
     43   std::vector<std::string> feature_names_;
     44 
     45   FeatureFactory factory_;
     46 };
     47 
     48 }  // namespace extensions
     49 
     50 #endif  // CHROME_COMMON_EXTENSIONS_FEATURES_BASE_FEATURE_PROVIDER_H_
     51