chrome/common/extensions/features/base_feature_provider.h

   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) const OVERRIDE;
  35   virtual Feature* GetParent(Feature* feature) const OVERRIDE;
  36   virtual std::vector<Feature*> GetChildren(const Feature& parent) const
  37       OVERRIDE;
  38
  39   virtual const std::vector<std::string>& GetAllFeatureNames() const OVERRIDE;
  40
  41  private:
  42   typedef std::map<std::string, linked_ptr<Feature> > FeatureMap;
  43   FeatureMap features_;
  44
  45   // Populated on first use.
  46   mutable std::vector<std::string> feature_names_;
  47
  48   FeatureFactory factory_;
  49 };
  50
  51 }  // namespace extensions
  52
  53 #endif  // CHROME_COMMON_EXTENSIONS_FEATURES_BASE_FEATURE_PROVIDER_H_