object_id.hpp
2.97 KB
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
/*************************************************************************
*
* Copyright 2019 Realm Inc.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
**************************************************************************/
#ifndef REALM_OBJECT_ID_HPP
#define REALM_OBJECT_ID_HPP
#include <array>
#include <cstdint>
#include <cstring>
#include <realm/timestamp.hpp>
namespace realm {
class ObjectId {
public:
static constexpr size_t num_bytes = 12;
using ObjectIdBytes = std::array<uint8_t, num_bytes>;
/**
* Constructs an ObjectId with all bytes 0x00.
*/
ObjectId() noexcept = default;
/**
* Checks if the given string is a valid object id.
*/
static bool is_valid_str(StringData) noexcept;
/**
* Constructs an ObjectId from 24 hex characters.
*/
ObjectId(const char* init) noexcept;
/**
* Constructs an ObjectID from an array of 12 unsigned bytes
*/
ObjectId(const ObjectIdBytes& init) noexcept;
/**
* Constructs an ObjectId with the specified inputs, and a random number
*/
ObjectId(Timestamp d, int machine_id, int process_id) noexcept;
/**
* Generates a new ObjectId using the algorithm to attempt to avoid collisions.
*/
static ObjectId gen();
bool operator==(const ObjectId& other) const
{
return m_bytes == other.m_bytes;
}
bool operator!=(const ObjectId& other) const
{
return m_bytes != other.m_bytes;
}
bool operator>(const ObjectId& other) const
{
return m_bytes > other.m_bytes;
}
bool operator<(const ObjectId& other) const
{
return m_bytes < other.m_bytes;
}
bool operator>=(const ObjectId& other) const
{
return m_bytes >= other.m_bytes;
}
bool operator<=(const ObjectId& other) const
{
return m_bytes <= other.m_bytes;
}
explicit operator Timestamp() const
{
return get_timestamp();
}
Timestamp get_timestamp() const;
std::string to_string() const;
ObjectIdBytes to_bytes() const;
size_t hash() const noexcept;
private:
ObjectIdBytes m_bytes = {};
};
inline std::ostream& operator<<(std::ostream& ostr, const ObjectId& id)
{
ostr << id.to_string();
return ostr;
}
} // namespace realm
namespace std {
template <>
struct hash<realm::ObjectId> {
size_t operator()(const realm::ObjectId& oid) const noexcept
{
return oid.hash();
}
};
} // namespace std
#endif /* REALM_OBJECT_ID_HPP */