1 /*
2   * Copyright (c) 2023 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 HCODEC_STATE_H
17 #define HCODEC_STATE_H
18 
19 #include <memory>
20 #include <string>
21 #include <utility>
22 #include "msg_handle_loop.h"
23 
24 namespace OHOS::MediaAVCodec {
25 class State {
26 public:
State(std::string stateName)27     explicit State(std::string stateName) : stateName_(std::move(stateName)) {}
GetName()28     const std::string GetName() const { return stateName_; }
29 
30 protected:
31     virtual ~State() = default;
OnStateEntered()32     virtual void OnStateEntered() {};
OnStateExited()33     virtual void OnStateExited() {};
34     virtual void OnMsgReceived(const MsgInfo &info) = 0;
35 
36     friend class StateMachine;
37 
38     std::string stateName_;
39 };
40 
41 class StateMachine : public MsgHandleLoop {
42 public:
43     StateMachine() = default;
44 
45 protected:
46     virtual ~StateMachine() = default;
47     void ChangeStateTo(const std::shared_ptr<State> &targetState);
48     void OnMsgReceived(const MsgInfo &info) override;
49 
50     std::shared_ptr<State> currState_;
51 };
52 } // namespace OHOS::MediaAVCodec
53 #endif // HCODEC_STATE_H
54