extensions/common/features/base_feature_provider.h

   1 // Copyright 2014 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_FEATURES_BASE_FEATURE_PROVIDER_H_
   6 #define EXTENSIONS_COMMON_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 "extensions/common/features/feature_provider.h"
  15 #include "extensions/common/features/simple_feature.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 the feature |feature_name|, if it exists.
  31   virtual Feature* GetFeature(const std::string& feature_name) const OVERRIDE;
  32   virtual Feature* GetParent(Feature* feature) const OVERRIDE;
  33   virtual std::vector<Feature*> GetChildren(const Feature& parent) const
  34       OVERRIDE;
  35
  36   virtual const std::vector<std::string>& GetAllFeatureNames() const OVERRIDE;
  37
  38  private:
  39   typedef std::map<std::string, linked_ptr<Feature> > FeatureMap;
  40   FeatureMap features_;
  41
  42   // Populated on first use.
  43   mutable std::vector<std::string> feature_names_;
  44
  45   FeatureFactory factory_;
  46 };
  47
  48 }  // namespace extensions
  49
  50 #endif  // EXTENSIONS_COMMON_FEATURES_BASE_FEATURE_PROVIDER_H_