1/*
2 * Copyright (c) 2022-2023 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 MSG_HANDLER_H
17#define MSG_HANDLER_H
18
19#include <functional>
20#include <map>
21#include <string>
22
23#include "proto.h"
24
25namespace OHOS {
26namespace Msdp {
27namespace DeviceStatus {
28template<typename K, typename V>
29class MsgHandler {
30public:
31    struct MsgCallback {
32        K id;
33        V fun;
34    };
35
36public:
37    void Clear()
38    {
39        callbacks_.clear();
40    }
41    bool CheckKey(K id)
42    {
43        return (GetMsgCallback(id) != nullptr);
44    }
45
46    const std::string& GetDebugInfo() const
47    {
48        std::string str;
49        for (auto &iter : callbacks_) {
50            str += std::to_string(iter.first);
51            str += ',';
52        }
53        if (!str.empty()) {
54            str.resize(str.size() - 1);
55        }
56
57        return std::move(str);
58    }
59
60    bool RegisterEvent(MsgCallback& msg)
61    {
62        auto it = callbacks_.find(msg.id);
63        if (it != callbacks_.end()) {
64            return false;
65        }
66        callbacks_[msg.id] = msg.fun;
67        return true;
68    }
69
70protected:
71    virtual ~MsgHandler() = default;
72    V *GetMsgCallback(K id)
73    {
74        auto iter = callbacks_.find(id);
75        if (iter == callbacks_.end()) {
76            return nullptr;
77        }
78        return &iter->second;
79    }
80
81protected:
82    std::map<K, V> callbacks_;
83};
84} // namespace DeviceStatus
85} // namespace Msdp
86} // namespace OHOS
87#endif // MSG_HANDLER_H
88