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 * 7 * http://www.apache.org/licenses/LICENSE-2.0 8 * 9 * Unless required by applicable law or agreed to in writing, software 10 * distributed under the License is distributed on an "AS IS" BASIS, 11 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 12 * See the License for the specific language governing permissions and 13 * limitations under the License. 14 */ 15 16 #ifndef PLUGIN_CLASS_BASE_H 17 #define PLUGIN_CLASS_BASE_H 18 19 #include <string> 20 21 namespace OHOS { 22 namespace MultimediaPlugin { 23 class AbsImplClassKey; 24 25 class PluginClassBase { 26 public: 27 PluginClassBase() = default; 28 virtual ~PluginClassBase(); 29 static constexpr uint32_t MAGIC_CODE = 0x1122CCFF; 30 31 private: 32 friend class ImplClass; 33 // the plugin manager guarantees that the key object continue to be valid until the plugin object is destroyed. 34 // return MAGIC_CODE used to check if the plugin class correctly inherits the PluginClassBase class. 35 uint32_t SetImplClassKey(AbsImplClassKey &key); 36 AbsImplClassKey *implClassKey_ = nullptr; 37 }; 38 } // namespace MultimediaPlugin 39 } // namespace OHOS 40 41 #endif // PLUGIN_CLASS_BASE_H 42