| Flutter Impeller |

archive_location.h
Go to the documentation of this file.
1 // Copyright 2013 The Flutter Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #ifndef FLUTTER_IMPELLER_ARCHIVIST_ARCHIVE_LOCATION_H_
6 #define FLUTTER_IMPELLER_ARCHIVIST_ARCHIVE_LOCATION_H_
7
8 #include <optional>
9 #include <type_traits>
10
11 #include "impeller/archivist/archivable.h"
12 #include "impeller/archivist/archive.h"
13 #include "impeller/base/allocation.h"
14
15 namespace impeller {
16
17 class Archive;
18 class ArchiveClassRegistration;
19 class ArchiveStatement;
20
21 class ArchiveLocation {
22 public:
23 PrimaryKey GetPrimaryKey() const;
24
25 template <class T, class = std::enable_if_t<std::is_integral<T>::value>>
26 bool Write(const std::string& member, T item) {
27 return WriteIntegral(member, static_cast<int64_t>(item));
28 }
29
30 bool Write(const std::string& member, double item);
31
32 bool Write(const std::string& member, const std::string& item);
33
34 bool Write(const std::string& member, const Allocation& allocation);
35
36 template <class T,
37 class = std::enable_if_t<std::is_base_of<Archivable, T>::value>>
38 bool WriteArchivable(const std::string& member, const T& other) {
39 const ArchiveDef& otherDef = T::ArchiveDefinition;
40 return Write(member, otherDef, other);
41 }
42
43 template <class T, class = std::enable_if_t<std::is_enum<T>::value>>
44 bool WriteEnum(const std::string& member, const T& item) {
45 return WriteIntegral(member, static_cast<int64_t>(item));
46 }
47
48 template <class T,
49 class = std::enable_if_t<std::is_base_of<Archivable, T>::value>>
50 bool Write(const std::string& member, const std::vector<T>& items) {
51 /*
52 * All items in the vector are individually encoded and their keys noted
53 */
54 std::vector<int64_t> members;
55 members.reserve(items.size());
56
57 const ArchiveDef& itemDefinition = T::kArchiveDefinition;
58 for (const auto& item : items) {
59 auto row_id = context_.ArchiveInstance(itemDefinition, item);
60 if (!row_id.has_value()) {
61 return false;
62 }
63 members.emplace_back(row_id.value());
64 }
65
66 /*
67 * The keys are flattened into the vectors table. Write to that table
68 */
69 auto vectorInsert = WriteVectorKeys(std::move(members));
70
71 if (!vectorInsert.has_value()) {
72 return false;
73 }
74
75 return WriteIntegral(member, vectorInsert.value());
76 }
77
78 template <class T, class = std::enable_if_t<std::is_integral<T>::value>>
79 bool Read(const std::string& member, T& item) {
80 int64_t decoded = 0;
81 auto result = ReadIntegral(member, decoded);
82 item = static_cast<T>(decoded);
83 return result;
84 }
85
86 bool Read(const std::string& member, double& item);
87
88 bool Read(const std::string& member, std::string& item);
89
90 bool Read(const std::string& member, Allocation& allocation);
91
92 template <class T,
93 class = std::enable_if_t<std::is_base_of<Archivable, T>::value>>
94 bool ReadArchivable(const std::string& member, T& other) {
95 const ArchiveDef& otherDef = T::ArchiveDefinition;
96 return decode(member, otherDef, other);
97 }
98
99 template <class T, class = std::enable_if_t<std::is_enum<T>::value>>
100 bool ReadEnum(const std::string& member, T& item) {
101 int64_t desugared = 0;
102 if (ReadIntegral(member, desugared)) {
103 item = static_cast<T>(desugared);
104 return true;
105 }
106 return false;
107 }
108
109 template <class T,
110 class = std::enable_if_t<std::is_base_of<Archivable, T>::value>>
111 bool Read(const std::string& member, std::vector<T>& items) {
112 /*
113 * From the member, find the foreign key of the vector
114 */
115 int64_t vectorForeignKey = 0;
116 if (!ReadIntegral(member, vectorForeignKey)) {
117 return false;
118 }
119
120 /*
121 * Get vector keys
122 */
123 std::vector<int64_t> keys;
124 if (!ReadVectorKeys(vectorForeignKey, keys)) {
125 return false;
126 }
127
128 const ArchiveDef& otherDef = T::kArchiveDefinition;
129 for (const auto& key : keys) {
130 items.emplace_back();
131
132 if (!context_.UnarchiveInstance(otherDef, key, items.back())) {
133 return false;
134 }
135 }
136
137 return true;
138 }
139
140 private:
141 Archive& context_;
142 ArchiveStatement& statement_;
143 const ArchiveClassRegistration& registration_;
144 PrimaryKey primary_key_;
145
146 friend class Archive;
147
148 ArchiveLocation(Archive& context,
149 ArchiveStatement& statement,
150 const ArchiveClassRegistration& registration,
151 PrimaryKey name);
152
153 bool WriteIntegral(const std::string& member, int64_t item);
154
155 bool ReadIntegral(const std::string& member, int64_t& item);
156
157 std::optional<int64_t> WriteVectorKeys(std::vector<int64_t>&& members);
158
159 bool ReadVectorKeys(PrimaryKey name, std::vector<int64_t>& members);
160
161 bool Write(const std::string& member,
162 const ArchiveDef& otherDef,
163 const Archivable& other);
164
165 bool Read(const std::string& member,
166 const ArchiveDef& otherDef,
167 Archivable& other);
168
169 ArchiveLocation(const ArchiveLocation&) = delete;
170
171 ArchiveLocation& operator=(const ArchiveLocation&) = delete;
172 };
173
174 } // namespace impeller
175
176 #endif // FLUTTER_IMPELLER_ARCHIVIST_ARCHIVE_LOCATION_H_
impeller::ArchiveLocation::GetPrimaryKey
PrimaryKey GetPrimaryKey() const
Definition: archive_location.cc:21
impeller::ArchiveLocation::ReadEnum
bool ReadEnum(const std::string &member, T &item)
Definition: archive_location.h:100
impeller::Archive
Definition: archive.h:21
allocation.h
impeller::Archivable
Instances of Archivables can be read from and written to a persistent archive.
Definition: archivable.h:28
impeller::ArchiveDef
Definition: archivable.h:15
impeller::ArchiveLocation::WriteEnum
bool WriteEnum(const std::string &member, const T &item)
Definition: archive_location.h:44
archivable.h
impeller::PrimaryKey
std::optional< int64_t > PrimaryKey
Definition: archivable.h:22
impeller::ArchiveLocation::Read
bool Read(const std::string &member, std::vector< T > &items)
Definition: archive_location.h:111
impeller::ArchiveLocation::Write
bool Write(const std::string &member, const std::vector< T > &items)
Definition: archive_location.h:50
impeller::ArchiveLocation::WriteArchivable
bool WriteArchivable(const std::string &member, const T &other)
Definition: archive_location.h:38
impeller::ArchiveClassRegistration
Definition: archive_class_registration.h:17
impeller::ArchiveLocation::ReadArchivable
bool ReadArchivable(const std::string &member, T &other)
Definition: archive_location.h:94
impeller::ArchiveLocation::Read
bool Read(const std::string &member, T &item)
Definition: archive_location.h:79
impeller::ArchiveStatement
Represents a read/write query to an archive database. Statements are expensive to create and must be ...
Definition: archive_statement.h:20
impeller::Allocation
Definition: allocation.h:16
impeller::ArchiveLocation
Definition: archive_location.h:21
archive.h
impeller::ArchiveLocation::Write
bool Write(const std::string &member, T item)
Definition: archive_location.h:26
impeller
Definition: aiks_context.cc:10