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// Copyright 2013 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_FEATURE_PROVIDER_H_
#define EXTENSIONS_COMMON_FEATURES_FEATURE_PROVIDER_H_
#include <map>
#include <memory>
#include <string>
#include <vector>
#include "base/strings/string_piece.h"
namespace extensions {
class Feature;
// Note: Binding code (specifically native_extension_bindings_system.cc) relies
// on this being a sorted map.
using FeatureMap = std::map<std::string, std::unique_ptr<const Feature>>;
// Implemented by classes that can vend features.
class FeatureProvider {
public:
FeatureProvider();
virtual ~FeatureProvider();
// Gets a FeatureProvider for a specific type, like "permission".
static const FeatureProvider* GetByName(const std::string& name);
// Directly access the common FeatureProvider types.
// Each is equivalent to GetByName('featuretype').
static const FeatureProvider* GetAPIFeatures();
static const FeatureProvider* GetManifestFeatures();
static const FeatureProvider* GetPermissionFeatures();
static const FeatureProvider* GetBehaviorFeatures();
// Directly get Features from the common FeatureProvider types.
// Each is equivalent to GetByName('featuretype')->GetFeature(name).
// NOTE: These functions may return |nullptr| in case corresponding JSON file
// got corrupted.
static const Feature* GetAPIFeature(const std::string& name);
static const Feature* GetManifestFeature(const std::string& name);
static const Feature* GetPermissionFeature(const std::string& name);
static const Feature* GetBehaviorFeature(const std::string& name);
// Returns the feature with the specified name.
const Feature* GetFeature(const std::string& name) const;
// Returns the parent feature of |feature|, or null if there isn't one.
const Feature* GetParent(const Feature& feature) const;
// Returns the features inside the |parent| namespace, recursively.
std::vector<const Feature*> GetChildren(const Feature& parent) const;
// Returns a map containing all features described by this instance.
// TODO(devlin): Rename this to be features().
const FeatureMap& GetAllFeatures() const;
void AddFeature(base::StringPiece name, std::unique_ptr<Feature> feature);
// Takes ownership. Used in preference to unique_ptr variant to reduce size
// of generated code.
void AddFeature(base::StringPiece name, Feature* feature);
private:
FeatureMap features_;
DISALLOW_COPY_AND_ASSIGN(FeatureProvider);
};
} // namespace extensions
#endif // EXTENSIONS_COMMON_FEATURES_FEATURE_PROVIDER_H_
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