| // 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_BROWSER_EXTENSION_FUNCTION_REGISTRY_H_ |
| #define EXTENSIONS_BROWSER_EXTENSION_FUNCTION_REGISTRY_H_ |
| |
| #include <map> |
| #include <string> |
| #include <vector> |
| |
| #include "extensions/browser/extension_function_histogram_value.h" |
| |
| class ExtensionFunction; |
| |
| // A factory function for creating new ExtensionFunction instances. |
| typedef ExtensionFunction* (*ExtensionFunctionFactory)(); |
| |
| // Template for defining ExtensionFunctionFactory. |
| template <class T> |
| ExtensionFunction* NewExtensionFunction() { |
| return new T(); |
| } |
| |
| // Contains a list of all known extension functions and allows clients to |
| // create instances of them. |
| class ExtensionFunctionRegistry { |
| public: |
| struct FactoryEntry { |
| public: |
| explicit FactoryEntry(); |
| constexpr FactoryEntry( |
| ExtensionFunctionFactory factory, |
| const char* function_name, |
| extensions::functions::HistogramValue histogram_value) |
| : factory_(factory), |
| function_name_(function_name), |
| histogram_value_(histogram_value) {} |
| |
| ExtensionFunctionFactory factory_; |
| const char* function_name_; |
| extensions::functions::HistogramValue histogram_value_; |
| }; |
| |
| static ExtensionFunctionRegistry* GetInstance(); |
| explicit ExtensionFunctionRegistry(); |
| virtual ~ExtensionFunctionRegistry(); |
| |
| // Allows overriding of specific functions (e.g. for testing). Functions |
| // must be previously registered. Returns true if successful. |
| bool OverrideFunction(const std::string& name, |
| ExtensionFunctionFactory factory); |
| |
| // Factory method for the ExtensionFunction registered as 'name'. |
| ExtensionFunction* NewFunction(const std::string& name); |
| |
| void Register(const FactoryEntry& entry); |
| template <class T> |
| void RegisterFunction() { |
| Register(FactoryEntry(&NewExtensionFunction<T>, T::function_name(), |
| T::histogram_value())); |
| } |
| |
| typedef std::map<std::string, FactoryEntry> FactoryMap; |
| FactoryMap factories_; |
| }; |
| |
| #endif // EXTENSIONS_BROWSER_EXTENSION_FUNCTION_REGISTRY_H_ |