Implement ComplexFeature to support permission features with multiple rules.

chrome/common/extensions/features/simple_feature.h

+// Copyright (c) 2012 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 CHROME_COMMON_EXTENSIONS_FEATURES_SIMPLE_FEATURE_H_
+#define CHROME_COMMON_EXTENSIONS_FEATURES_SIMPLE_FEATURE_H_
+
+#include <set>
+#include <string>
+
+#include "base/values.h"
+#include "chrome/common/chrome_version_info.h"
+#include "chrome/common/extensions/extension.h"
+#include "chrome/common/extensions/features/feature.h"
+
+namespace extensions {
+
+class ComplexFeature;
+
+class SimpleFeature : public Feature {
+ public:
+  SimpleFeature();
+  SimpleFeature(const SimpleFeature& other);
+  virtual ~SimpleFeature();
+
+  std::set<std::string>* whitelist() { return &whitelist_; }
+  std::set<Extension::Type>* extension_types() { return &extension_types_; }
+
+  virtual std::set<Context>* contexts() OVERRIDE { return &contexts_; }
+
+  // Parses the JSON representation of a feature into the fields of this object.
+  // Unspecified values in the JSON are not modified in the object. This allows
+  // us to implement inheritance by parsing one value after another.
+  void Parse(const DictionaryValue* value);
+
+  // Returns true if the feature contains the same values as another.
+  bool Equals(const SimpleFeature& other) const;
+
+  Location location() const { return location_; }
+  void set_location(Location location) { location_ = location; }
+
+  Platform platform() const { return platform_; }
+  void set_platform(Platform platform) { platform_ = platform; }
+
+  int min_manifest_version() const { return min_manifest_version_; }
+  void set_min_manifest_version(int min_manifest_version) {
+    min_manifest_version_ = min_manifest_version;
+  }
+
+  int max_manifest_version() const { return max_manifest_version_; }
+  void set_max_manifest_version(int max_manifest_version) {
+    max_manifest_version_ = max_manifest_version;
+  }
+
+  Availability IsAvailableToContext(const Extension* extension,
+                                    Context context) const {
+    return IsAvailableToContext(extension, context, GetCurrentPlatform());
+  }
+
+  // extension::Feature:
+  virtual Availability IsAvailableToManifest(const std::string& extension_id,
+                                             Extension::Type type,
+                                             Location location,
+                                             int manifest_version,
+                                             Platform platform) const OVERRIDE;
+
+  virtual Availability IsAvailableToContext(const Extension* extension,
+                                            Context context,
+                                            Platform platform) const OVERRIDE;
+
+  virtual std::string GetAvailabilityMessage(
+      AvailabilityResult result, Extension::Type type) const OVERRIDE;
+
+ private:
+  // For clarity and consistency, we handle the default value of each of these
+  // members the same way: it matches everything. It is up to the higher level
+  // code that reads Features out of static data to validate that data and set
+  // sensible defaults.
+  std::set<std::string> whitelist_;
+  std::set<Extension::Type> extension_types_;
+  std::set<Context> contexts_;
+  Location location_;  // we only care about component/not-component now
+  Platform platform_;  // we only care about chromeos/not-chromeos now
+  int min_manifest_version_;
+  int max_manifest_version_;
+  chrome::VersionInfo::Channel channel_;
+
+  FRIEND_TEST_ALL_PREFIXES(ExtensionSimpleFeatureTest, Context);
+};
+
+}  // namespace extensions
+
+#endif  // CHROME_COMMON_EXTENSIONS_FEATURES_SIMPLE_FEATURE_H_