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
17namespace extensions {
18
19// Reads Features out of a simple JSON file description.
20class 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_
51