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 MULTI_VER_VALUE_OBJECT_H
17 #define MULTI_VER_VALUE_OBJECT_H
18 
19 #ifndef OMIT_MULTI_VER
20 #include <cstdint>
21 #include <vector>
22 
23 #include "db_types.h"
24 
25 namespace DistributedDB {
26 using ValueSliceHash = std::vector<uint8_t>;
27 using ValueSlice = std::vector<uint8_t>;
28 
29 struct ValueObjectHead {
30     uint8_t flag = 0;
31     uint8_t reserved = 0;
32     uint16_t hashNum = 1;
33     uint32_t length = 0;
34 };
35 
36 class MultiVerValueObject {
37 public:
38     static const uint8_t HASH_FLAG = 0x01;
39 
MultiVerValueObject()40     MultiVerValueObject() {}
~MultiVerValueObject()41     ~MultiVerValueObject() {}
42 
43     int GetValueHash(std::vector<ValueSliceHash> &valueHashes) const;
44     int SetValueHash(const std::vector<ValueSliceHash> &valueHashes);
45 
46     int GetSerialData(std::vector<uint8_t> &data) const;
47     int DeSerialData(const std::vector<uint8_t> &data);
48 
49     uint32_t GetDataLength() const;
50     void SetDataLength(uint32_t);
51 
52     int GetValue(Value &value) const;
53     int SetValue(const Value &value);
54 
55     bool IsHash() const;
56 
57     // 1:value has been Hash. 0:Origin value
58     void SetFlag(uint8_t flag);
59 
60 private:
61     ValueObjectHead head_;
62     std::vector<uint8_t> valueHashVector_;
63 };
64 }
65 
66 #endif  // MULTI_VER_VALUE_OBJECT_H
67 #endif