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// Copyright 2014 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef EXTENSIONS_COMMON_FEATURES_BASE_FEATURE_PROVIDER_H_
#define EXTENSIONS_COMMON_FEATURES_BASE_FEATURE_PROVIDER_H_
#include <map>
#include <string>
#include <vector>
#include "base/memory/linked_ptr.h"
#include "base/values.h"
#include "extensions/common/features/feature_provider.h"
#include "extensions/common/features/simple_feature.h"
namespace extensions {
// Reads Features out of a simple JSON file description.
class BaseFeatureProvider : public FeatureProvider {
public:
typedef SimpleFeature*(*FeatureFactory)();
// Creates a new BaseFeatureProvider. Pass null to |factory| to have the
// provider create plain old Feature instances.
BaseFeatureProvider(const base::DictionaryValue& root,
FeatureFactory factory);
~BaseFeatureProvider() override;
// Gets the feature |feature_name|, if it exists.
Feature* GetFeature(const std::string& feature_name) const override;
Feature* GetParent(Feature* feature) const override;
std::vector<Feature*> GetChildren(const Feature& parent) const override;
const std::vector<std::string>& GetAllFeatureNames() const override;
private:
typedef std::map<std::string, linked_ptr<Feature> > FeatureMap;
FeatureMap features_;
// Populated on first use.
mutable std::vector<std::string> feature_names_;
FeatureFactory factory_;
};
} // namespace extensions
#endif // EXTENSIONS_COMMON_FEATURES_BASE_FEATURE_PROVIDER_H_
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