1 /*
2  * Copyright (c) 2024 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 DATASHARE_OBSERVER_H
17 #define DATASHARE_OBSERVER_H
18 
19 #include <list>
20 #include <map>
21 #include <string>
22 
23 #include "uri.h"
24 
25 namespace OHOS::DataShare {
26 class DataShareObserver {
27 public:
28     DataShareObserver() = default;
29     virtual ~DataShareObserver() = default;
30     enum SubscriptionType : uint32_t {
31         SUBSCRIPTION_TYPE_EXACT_URI = 0,
32     };
33     enum ChangeType : uint32_t {
34         INSERT = 0,
35         DELETE,
36         UPDATE,
37         OTHER,
38         INVAILD,
39     };
40 
41     struct ChangeInfo {
42         using Value = std::variant<std::monostate, int64_t, double, std::string, bool, std::vector<uint8_t>>;
43         using VBucket = std::map<std::string, Value>;
44         using VBuckets = std::vector<VBucket>;
45         ChangeType changeType_ = INVAILD;
46         std::list<Uri> uris_ = {};
47         const void* data_ = nullptr;
48         uint32_t size_ = 0;
49         VBuckets valueBuckets_ = {};
50     };
51 
52     virtual void OnChange(const ChangeInfo& changeInfo) = 0;
53 };
54 }
55 #endif // DATASHARE_OBSERVER_H
56