1/*
2 * Copyright (c) 2021-2022 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 MMI {
27template<typename K, typename V>
28class MsgHandler {
29public:
30    void Clear()
31    {
32        callbacks_.clear();
33    }
34    bool ChkKey(K id)
35    {
36        return (GetMsgCallback(id) != nullptr);
37    }
38
39    const std::string& GetDebugInfo() const
40    {
41        std::string str;
42        for (auto &it : callbacks_) {
43            str += std::to_string(it.first);
44            str += ',';
45        }
46        if (str.size() > 0) {
47            str.resize(str.size() - 1);
48        }
49        return std::move(str);
50    }
51
52protected:
53    struct MsgCallback {
54        K id;
55        V fun;
56    };
57
58protected:
59    virtual ~MsgHandler() = default;
60    V *GetMsgCallback(K id)
61    {
62        auto it = callbacks_.find(id);
63        if (it == callbacks_.end()) {
64            return nullptr;
65        }
66        return &it->second;
67    }
68    bool RegistrationEvent(MsgCallback& msg)
69    {
70        auto it = callbacks_.find(msg.id);
71        if (it != callbacks_.end()) {
72            return false;
73        }
74        callbacks_[msg.id] = msg.fun;
75        return true;
76    }
77
78protected:
79    std::map<K, V> callbacks_;
80};
81} // namespace MMI
82} // namespace OHOS
83#endif // MSG_HANDLER_H
84