// Protocol Buffers - Google's data interchange format
// Copyright 2008 Google Inc. All rights reserved.
// https://developers.google.com/protocol-buffers/
//
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// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following disclaimer
// in the documentation and/or other materials provided with the
// distribution.
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// contributors may be used to endorse or promote products derived from
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//
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#ifndef GOOGLE_PROTOBUF_MAP_ENTRY_LITE_H__
#define GOOGLE_PROTOBUF_MAP_ENTRY_LITE_H__
#include <google/protobuf/map_type_handler.h>
#include <google/protobuf/wire_format_lite_inl.h>
namespace google {
namespace protobuf {
class Arena;
namespace internal {
template <typename Key, typename Value,
WireFormatLite::FieldType kKeyFieldType,
WireFormatLite::FieldType kValueFieldType,
int default_enum_value>
class MapEntry;
template <typename Key, typename Value,
WireFormatLite::FieldType kKeyFieldType,
WireFormatLite::FieldType kValueFieldType,
int default_enum_value>
class MapFieldLite;
} // namespace internal
} // namespace protobuf
namespace protobuf {
namespace internal {
// MapEntryLite is used to implement parsing and serialization of map for lite
// runtime.
template <typename Key, typename Value,
WireFormatLite::FieldType kKeyFieldType,
WireFormatLite::FieldType kValueFieldType,
int default_enum_value>
class LIBPROTOBUF_EXPORT MapEntryLite : public MessageLite {
// Handlers for key/value wire type. Provide utilities to parse/serialize
// key/value.
typedef MapWireFieldTypeHandler<kKeyFieldType> KeyWireHandler;
typedef MapWireFieldTypeHandler<kValueFieldType> ValueWireHandler;
// Define key/value's internal stored type. Message is the only one whose
// internal stored type cannot be inferred from its proto type
static const bool kIsKeyMessage = KeyWireHandler::kIsMessage;
static const bool kIsValueMessage = ValueWireHandler::kIsMessage;
typedef typename KeyWireHandler::CppType KeyInternalType;
typedef typename ValueWireHandler::CppType ValueInternalType;
typedef typename MapIf<kIsKeyMessage, Key, KeyInternalType>::type
KeyCppType;
typedef typename MapIf<kIsValueMessage, Value, ValueInternalType>::type
ValCppType;
// Handlers for key/value's internal stored type. Provide utilities to
// manipulate internal stored type. We need it because some types are stored
// as values and others are stored as pointers (Message and string), but we
// need to keep the code in MapEntry unified instead of providing different
// codes for each type.
typedef MapCppTypeHandler<KeyCppType> KeyCppHandler;
typedef MapCppTypeHandler<ValCppType> ValueCppHandler;
// Define internal memory layout. Strings and messages are stored as
// pointers, while other types are stored as values.
static const bool kKeyIsStringOrMessage = KeyCppHandler::kIsStringOrMessage;
static const bool kValIsStringOrMessage = ValueCppHandler::kIsStringOrMessage;
typedef typename MapIf<kKeyIsStringOrMessage, KeyCppType*, KeyCppType>::type
KeyBase;
typedef typename MapIf<kValIsStringOrMessage, ValCppType*, ValCppType>::type
ValueBase;
// Constants for field number.
static const int kKeyFieldNumber = 1;
static const int kValueFieldNumber = 2;
// Constants for field tag.
static const uint8 kKeyTag = GOOGLE_PROTOBUF_WIRE_FORMAT_MAKE_TAG(
kKeyFieldNumber, KeyWireHandler::kWireType);
static const uint8 kValueTag = GOOGLE_PROTOBUF_WIRE_FORMAT_MAKE_TAG(
kValueFieldNumber, ValueWireHandler::kWireType);
static const int kTagSize = 1;
public:
~MapEntryLite() {
if (this != default_instance_) {
KeyCppHandler::Delete(key_);
ValueCppHandler::Delete(value_);
}
}
// accessors ======================================================
virtual inline const KeyCppType& key() const {
return KeyCppHandler::Reference(key_);
}
inline KeyCppType* mutable_key() {
set_has_key();
KeyCppHandler::EnsureMutable(&key_, GetArenaNoVirtual());
return KeyCppHandler::Pointer(key_);
}
virtual inline const ValCppType& value() const {
GOOGLE_CHECK(default_instance_ != NULL);
return ValueCppHandler::DefaultIfNotInitialized(value_,
default_instance_->value_);
}
inline ValCppType* mutable_value() {
set_has_value();
ValueCppHandler::EnsureMutable(&value_, GetArenaNoVirtual());
return ValueCppHandler::Pointer(value_);
}
// implements MessageLite =========================================
// MapEntryLite is for implementation only and this function isn't called
// anywhere. Just provide a fake implementation here for MessageLite.
string GetTypeName() const { return ""; }
void CheckTypeAndMergeFrom(const MessageLite& other) {
MergeFrom(*::google::protobuf::down_cast<const MapEntryLite*>(&other));
}
bool MergePartialFromCodedStream(::google::protobuf::io::CodedInputStream* input) {
uint32 tag;
for (;;) {
// 1) corrupted data: return false;
// 2) unknown field: skip without putting into unknown field set;
// 3) unknown enum value: keep it in parsing. In proto2, caller should
// check the value and put this entry into containing message's unknown
// field set if the value is an unknown enum. In proto3, caller doesn't
// need to care whether the value is unknown enum;
// 4) missing key/value: missed key/value will have default value. caller
// should take this entry as if key/value is set to default value.
tag = input->ReadTag();
switch (tag) {
case kKeyTag:
if (!KeyWireHandler::Read(input, mutable_key())) return false;
set_has_key();
if (!input->ExpectTag(kValueTag)) break;
GOOGLE_FALLTHROUGH_INTENDED;
case kValueTag:
if (!ValueWireHandler::Read(input, mutable_value())) return false;
set_has_value();
if (input->ExpectAtEnd()) return true;
break;
default:
if (tag == 0 ||
WireFormatLite::GetTagWireType(tag) ==
WireFormatLite::WIRETYPE_END_GROUP) {
return true;
}
if (!WireFormatLite::SkipField(input, tag)) return false;
break;
}
}
}
int ByteSize() const {
int size = 0;
size += has_key() ? kTagSize + KeyWireHandler::ByteSize(key()) : 0;
size += has_value() ? kTagSize + ValueWireHandler::ByteSize(value()) : 0;
return size;
}
void SerializeWithCachedSizes(::google::protobuf::io::CodedOutputStream* output) const {
KeyWireHandler::Write(kKeyFieldNumber, key(), output);
ValueWireHandler::Write(kValueFieldNumber, value(), output);
}
::google::protobuf::uint8* SerializeWithCachedSizesToArray(::google::protobuf::uint8* output) const {
output = KeyWireHandler::WriteToArray(kKeyFieldNumber, key(), output);
output =
ValueWireHandler::WriteToArray(kValueFieldNumber, value(), output);
return output;
}
int GetCachedSize() const {
int size = 0;
size += has_key() ? kTagSize + KeyWireHandler::GetCachedSize(key()) : 0;
size +=
has_value() ? kTagSize + ValueWireHandler::GetCachedSize(value()) : 0;
return size;
}
bool IsInitialized() const { return ValueCppHandler::IsInitialized(value_); }
MessageLite* New() const {
MapEntryLite* entry = new MapEntryLite;
entry->default_instance_ = default_instance_;
return entry;
}
MessageLite* New(Arena* arena) const {
MapEntryLite* entry = Arena::CreateMessage<MapEntryLite>(arena);
entry->default_instance_ = default_instance_;
return entry;
}
int SpaceUsed() const {
int size = sizeof(MapEntryLite);
size += KeyCppHandler::SpaceUsedInMapEntry(key_);
size += ValueCppHandler::SpaceUsedInMapEntry(value_);
return size;
}
void MergeFrom(const MapEntryLite& from) {
if (from._has_bits_[0]) {
if (from.has_key()) {
KeyCppHandler::EnsureMutable(&key_, GetArenaNoVirtual());
KeyCppHandler::Merge(from.key(), &key_);
set_has_key();
}
if (from.has_value()) {
ValueCppHandler::EnsureMutable(&value_, GetArenaNoVirtual());
ValueCppHandler::Merge(from.value(), &value_);
set_has_value();
}
}
}
void Clear() {
KeyCppHandler::Clear(&key_);
ValueCppHandler::ClearMaybeByDefaultEnum(&value_, default_enum_value);
clear_has_key();
clear_has_value();
}
void InitAsDefaultInstance() {
KeyCppHandler::AssignDefaultValue(&key_);
ValueCppHandler::AssignDefaultValue(&value_);
}
Arena* GetArena() const {
return GetArenaNoVirtual();
}
// Create a MapEntryLite for given key and value from google::protobuf::Map in
// serialization. This function is only called when value is enum. Enum is
// treated differently because its type in MapEntry is int and its type in
// google::protobuf::Map is enum. We cannot create a reference to int from an enum.
static MapEntryLite* EnumWrap(const Key& key, const Value value,
Arena* arena) {
return Arena::CreateMessage<MapEnumEntryWrapper<
Key, Value, kKeyFieldType, kValueFieldType, default_enum_value> >(
arena, key, value);
}
// Like above, but for all the other types. This avoids value copy to create
// MapEntryLite from google::protobuf::Map in serialization.
static MapEntryLite* Wrap(const Key& key, const Value& value, Arena* arena) {
return Arena::CreateMessage<MapEntryWrapper<Key, Value, kKeyFieldType,
kValueFieldType,
default_enum_value> >(
arena, key, value);
}
protected:
void set_has_key() { _has_bits_[0] |= 0x00000001u; }
bool has_key() const { return (_has_bits_[0] & 0x00000001u) != 0; }
void clear_has_key() { _has_bits_[0] &= ~0x00000001u; }
void set_has_value() { _has_bits_[0] |= 0x00000002u; }
bool has_value() const { return (_has_bits_[0] & 0x00000002u) != 0; }
void clear_has_value() { _has_bits_[0] &= ~0x00000002u; }
private:
// Serializing a generated message containing map field involves serializing
// key-value pairs from google::protobuf::Map. The wire format of each key-value pair
// after serialization should be the same as that of a MapEntry message
// containing the same key and value inside it. However, google::protobuf::Map doesn't
// store key and value as MapEntry message, which disables us to use existing
// code to serialize message. In order to use existing code to serialize
// message, we need to construct a MapEntry from key-value pair. But it
// involves copy of key and value to construct a MapEntry. In order to avoid
// this copy in constructing a MapEntry, we need the following class which
// only takes references of given key and value.
template <typename K, typename V, WireFormatLite::FieldType k_wire_type,
WireFormatLite::FieldType v_wire_type, int default_enum>
class LIBPROTOBUF_EXPORT MapEntryWrapper
: public MapEntryLite<K, V, k_wire_type, v_wire_type, default_enum> {
typedef MapEntryLite<K, V, k_wire_type, v_wire_type, default_enum> Base;
typedef typename Base::KeyCppType KeyCppType;
typedef typename Base::ValCppType ValCppType;
public:
MapEntryWrapper(Arena* arena, const K& key, const V& value)
: MapEntryLite<K, V, k_wire_type, v_wire_type, default_enum>(arena),
key_(key),
value_(value) {
Base::set_has_key();
Base::set_has_value();
}
inline const KeyCppType& key() const { return key_; }
inline const ValCppType& value() const { return value_; }
private:
const Key& key_;
const Value& value_;
friend class ::google::protobuf::Arena;
typedef void InternalArenaConstructable_;
typedef void DestructorSkippable_;
};
// Like above, but for enum value only, which stores value instead of
// reference of value field inside. This is needed because the type of value
// field in constructor is an enum, while we need to store it as an int. If we
// initialize a reference to int with a reference to enum, compiler will
// generate a temporary int from enum and initialize the reference to int with
// the temporary.
template <typename K, typename V, WireFormatLite::FieldType k_wire_type,
WireFormatLite::FieldType v_wire_type, int default_enum>
class LIBPROTOBUF_EXPORT MapEnumEntryWrapper
: public MapEntryLite<K, V, k_wire_type, v_wire_type, default_enum> {
typedef MapEntryLite<K, V, k_wire_type, v_wire_type, default_enum> Base;
typedef typename Base::KeyCppType KeyCppType;
typedef typename Base::ValCppType ValCppType;
public:
MapEnumEntryWrapper(Arena* arena, const K& key, const V& value)
: MapEntryLite<K, V, k_wire_type, v_wire_type, default_enum>(arena),
key_(key),
value_(value) {
Base::set_has_key();
Base::set_has_value();
}
inline const KeyCppType& key() const { return key_; }
inline const ValCppType& value() const { return value_; }
private:
const KeyCppType& key_;
const ValCppType value_;
friend class LIBPROTOBUF_EXPORT google::protobuf::Arena;
typedef void DestructorSkippable_;
};
MapEntryLite() : default_instance_(NULL), arena_(NULL) {
KeyCppHandler::Initialize(&key_, NULL);
ValueCppHandler::InitializeMaybeByDefaultEnum(
&value_, default_enum_value, NULL);
_has_bits_[0] = 0;
}
explicit MapEntryLite(Arena* arena)
: default_instance_(NULL), arena_(arena) {
KeyCppHandler::Initialize(&key_, arena);
ValueCppHandler::InitializeMaybeByDefaultEnum(
&value_, default_enum_value, arena);
_has_bits_[0] = 0;
}
inline Arena* GetArenaNoVirtual() const {
return arena_;
}
void set_default_instance(MapEntryLite* default_instance) {
default_instance_ = default_instance;
}
MapEntryLite* default_instance_;
KeyBase key_;
ValueBase value_;
Arena* arena_;
uint32 _has_bits_[1];
friend class ::google::protobuf::Arena;
typedef void InternalArenaConstructable_;
typedef void DestructorSkippable_;
template <typename K, typename V, WireFormatLite::FieldType,
WireFormatLite::FieldType, int>
friend class LIBPROTOBUF_EXPORT internal::MapEntry;
template <typename K, typename V, WireFormatLite::FieldType,
WireFormatLite::FieldType, int>
friend class LIBPROTOBUF_EXPORT internal::MapFieldLite;
GOOGLE_DISALLOW_EVIL_CONSTRUCTORS(MapEntryLite);
};
} // namespace internal
} // namespace protobuf
} // namespace google
#endif // GOOGLE_PROTOBUF_MAP_ENTRY_LITE_H__