1 /* 2 * Copyright (c) 2021 Huawei Device Co., Ltd. 3 * Licensed under the Apache License, Version 2.0 (the "License"); 4 * you may not use this file except in compliance with the License. 5 * You may obtain a copy of the License at 6 * http://www.apache.org/licenses/LICENSE-2.0 7 * Unless required by applicable law or agreed to in writing, software 8 * distributed under the License is distributed on an "AS IS" BASIS, 9 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 10 * See the License for the specific language governing permissions and 11 * limitations under the License. 12 */ 13 14 #ifndef OBJECT_FACTORY_H 15 #define OBJECT_FACTORY_H 16 #include <string> 17 #include <memory> 18 #include <unordered_map> 19 #include <functional> 20 #include <vector> 21 #include "no_copyable.h" 22 23 namespace OHOS::Camera { 24 template<typename B, typename... Args> 25 class RegisterFactoty : public NoCopyable { 26 public: 27 using CreatorFunc = std::function<std::shared_ptr<B>(Args...)>; Instance()28 static RegisterFactoty& Instance() 29 { 30 static RegisterFactoty r; 31 return r; 32 } 33 34 template<typename T, typename std::enable_if_t<std::is_base_of_v<B, T>>* = nullptr> DoRegister(const std::vector<std::string> & names,CreatorFunc f)35 std::string DoRegister(const std::vector<std::string>& names, CreatorFunc f) 36 { 37 std::string result; 38 for (const auto& it : names) { 39 result += it; 40 builder_.emplace(it, f); 41 } 42 return result; 43 } 44 CreateShared(const std::string & name,Args...args)45 std::shared_ptr<B> CreateShared(const std::string& name, Args... args) 46 { 47 std::shared_ptr<B> result = nullptr; 48 for (auto&& [n, builder] : builder_) { 49 if (n == name) { 50 result = builder(std::forward<Args>(args)...); 51 break; 52 } 53 } 54 return result; 55 } 56 RegisterFactoty() = default; 57 ~RegisterFactoty() = default; 58 private: 59 std::unordered_map<std::string, CreatorFunc> builder_; 60 }; 61 } 62 #endif