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1 // Protocol Buffers - Google's data interchange format
2 // Copyright 2008 Google Inc.  All rights reserved.
3 // https://developers.google.com/protocol-buffers/
4 //
5 // Redistribution and use in source and binary forms, with or without
6 // modification, are permitted provided that the following conditions are
7 // met:
8 //
9 //     * Redistributions of source code must retain the above copyright
10 // notice, this list of conditions and the following disclaimer.
11 //     * Redistributions in binary form must reproduce the above
12 // copyright notice, this list of conditions and the following disclaimer
13 // in the documentation and/or other materials provided with the
14 // distribution.
15 //     * Neither the name of Google Inc. nor the names of its
16 // contributors may be used to endorse or promote products derived from
17 // this software without specific prior written permission.
18 //
19 // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
20 // "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
21 // LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
22 // A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
23 // OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
24 // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
25 // LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
26 // DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
27 // THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
28 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
29 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
30 
31 #ifndef GOOGLE_PROTOBUF_MAP_ENTRY_H__
32 #define GOOGLE_PROTOBUF_MAP_ENTRY_H__
33 
34 #include <google/protobuf/generated_message_reflection.h>
35 #include <google/protobuf/map_entry_lite.h>
36 #include <google/protobuf/map_type_handler.h>
37 #include <google/protobuf/port.h>
38 #include <google/protobuf/reflection_ops.h>
39 #include <google/protobuf/unknown_field_set.h>
40 #include <google/protobuf/wire_format_lite.h>
41 
42 #include <google/protobuf/port_def.inc>
43 
44 #ifdef SWIG
45 #error "You cannot SWIG proto headers"
46 #endif
47 
48 namespace google {
49 namespace protobuf {
50 class Arena;
51 namespace internal {
52 template <typename Derived, typename Key, typename Value,
53           WireFormatLite::FieldType kKeyFieldType,
54           WireFormatLite::FieldType kValueFieldType, int default_enum_value>
55 class MapField;
56 }
57 }  // namespace protobuf
58 }  // namespace google
59 
60 namespace google {
61 namespace protobuf {
62 namespace internal {
63 
64 // MapEntry is the returned google::protobuf::Message when calling AddMessage of
65 // google::protobuf::Reflection. In order to let it work with generated message
66 // reflection, its in-memory type is the same as generated message with the same
67 // fields. However, in order to decide the in-memory type of key/value, we need
68 // to know both their cpp type in generated api and proto type. In
69 // implementation, all in-memory types have related wire format functions to
70 // support except ArenaStringPtr. Therefore, we need to define another type with
71 // supporting wire format functions. Since this type is only used as return type
72 // of MapEntry accessors, it's named MapEntry accessor type.
73 //
74 // cpp type:               the type visible to users in public API.
75 // proto type:             WireFormatLite::FieldType of the field.
76 // in-memory type:         type of the data member used to stored this field.
77 // MapEntry accessor type: type used in MapEntry getters/mutators to access the
78 //                         field.
79 //
80 // cpp type | proto type  | in-memory type | MapEntry accessor type
81 // int32      TYPE_INT32    int32            int32
82 // int32      TYPE_FIXED32  int32            int32
83 // string     TYPE_STRING   ArenaStringPtr   string
84 // FooEnum    TYPE_ENUM     int              int
85 // FooMessage TYPE_MESSAGE  FooMessage*      FooMessage
86 //
87 // The in-memory types of primitive types can be inferred from its proto type,
88 // while we need to explicitly specify the cpp type if proto type is
89 // TYPE_MESSAGE to infer the in-memory type.  Moreover, default_enum_value is
90 // used to initialize enum field in proto2.
91 template <typename Derived, typename Key, typename Value,
92           WireFormatLite::FieldType kKeyFieldType,
93           WireFormatLite::FieldType kValueFieldType, int default_enum_value>
94 class MapEntry
95     : public MapEntryImpl<Derived, Message, Key, Value, kKeyFieldType,
96                           kValueFieldType, default_enum_value> {
97  public:
MapEntry()98   MapEntry() : _internal_metadata_(NULL) {}
MapEntry(Arena * arena)99   explicit MapEntry(Arena* arena)
100       : MapEntryImpl<Derived, Message, Key, Value, kKeyFieldType,
101                      kValueFieldType, default_enum_value>(arena),
102         _internal_metadata_(arena) {}
~MapEntry()103   ~MapEntry() {
104     Message::_internal_metadata_.Delete<UnknownFieldSet>();
105     _internal_metadata_.Delete<UnknownFieldSet>();
106   }
107   typedef void InternalArenaConstructable_;
108   typedef void DestructorSkippable_;
109 
110   typedef
111       typename MapEntryImpl<Derived, Message, Key, Value, kKeyFieldType,
112                             kValueFieldType, default_enum_value>::KeyTypeHandler
113           KeyTypeHandler;
114   typedef typename MapEntryImpl<
115       Derived, Message, Key, Value, kKeyFieldType, kValueFieldType,
116       default_enum_value>::ValueTypeHandler ValueTypeHandler;
SpaceUsedLong()117   size_t SpaceUsedLong() const override {
118     size_t size = sizeof(Derived);
119     size += KeyTypeHandler::SpaceUsedInMapEntryLong(this->key_);
120     size += ValueTypeHandler::SpaceUsedInMapEntryLong(this->value_);
121     return size;
122   }
123 
124   InternalMetadata _internal_metadata_;
125 
126  private:
127   friend class ::PROTOBUF_NAMESPACE_ID::Arena;
128   template <typename C, typename K, typename V,
129             WireFormatLite::FieldType k_wire_type, WireFormatLite::FieldType,
130             int default_enum>
131   friend class internal::MapField;
132 
133   GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(MapEntry);
134 };
135 
136 // Specialization for the full runtime
137 template <typename Derived, typename Key, typename Value,
138           WireFormatLite::FieldType kKeyFieldType,
139           WireFormatLite::FieldType kValueFieldType, int default_enum_value>
140 struct MapEntryHelper<MapEntry<Derived, Key, Value, kKeyFieldType,
141                                kValueFieldType, default_enum_value> >
142     : MapEntryHelper<MapEntryLite<Derived, Key, Value, kKeyFieldType,
143                                   kValueFieldType, default_enum_value> > {
144   explicit MapEntryHelper(const MapPair<Key, Value>& map_pair)
145       : MapEntryHelper<MapEntryLite<Derived, Key, Value, kKeyFieldType,
146                                     kValueFieldType, default_enum_value> >(
147             map_pair) {}
148 };
149 
150 template <typename Derived, typename K, typename V,
151           WireFormatLite::FieldType key, WireFormatLite::FieldType value,
152           int default_enum>
153 struct DeconstructMapEntry<MapEntry<Derived, K, V, key, value, default_enum> > {
154   typedef K Key;
155   typedef V Value;
156   static constexpr WireFormatLite::FieldType kKeyFieldType = key;
157   static constexpr WireFormatLite::FieldType kValueFieldType = value;
158   static constexpr int default_enum_value = default_enum;
159 };
160 
161 }  // namespace internal
162 }  // namespace protobuf
163 }  // namespace google
164 
165 #include <google/protobuf/port_undef.inc>
166 
167 #endif  // GOOGLE_PROTOBUF_MAP_ENTRY_H__
168