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#pragma once
#include "cast.h"
#include "path.h"
#include "traits.h"
#include <google/protobuf/descriptor.h>
#include <google/protobuf/message.h>
#include <util/generic/maybe.h>
#include <util/generic/typetraits.h>
#include <util/generic/vector.h>
#include <util/system/defaults.h>
namespace NProtoBuf {
class TConstField {
public:
TConstField(const Message& msg, const FieldDescriptor* fd)
: Msg(msg)
, Fd(fd)
{
Y_ASSERT(Fd && Fd->containing_type() == Msg.GetDescriptor());
}
static TMaybe<TConstField> ByPath(const Message& msg, const TStringBuf& path);
static TMaybe<TConstField> ByPath(const Message& msg, const TVector<const FieldDescriptor*>& fieldsPath);
static TMaybe<TConstField> ByPath(const Message& msg, const TFieldPath& fieldsPath);
const Message& Parent() const {
return Msg;
}
const FieldDescriptor* Field() const {
return Fd;
}
bool HasValue() const {
return IsRepeated() ? Refl().FieldSize(Msg, Fd) > 0
: Refl().HasField(Msg, Fd);
}
// deprecated, use HasValue() instead
bool Has() const {
return HasValue();
}
size_t Size() const {
return IsRepeated() ? Refl().FieldSize(Msg, Fd)
: (Refl().HasField(Msg, Fd) ? 1 : 0);
}
template <typename T>
inline typename TSelectCppType<T>::T Get(size_t index = 0) const;
template <typename TMsg>
inline const TMsg* GetAs(size_t index = 0) const {
// casting version of Get
return IsMessageInstance<TMsg>() ? CheckedCast<const TMsg*>(Get<const Message*>(index)) : nullptr;
}
template <typename T>
bool IsInstance() const {
return CppType() == TSelectCppType<T>::Result;
}
template <typename TMsg>
bool IsMessageInstance() const {
return IsMessage() && Fd->message_type() == TMsg::descriptor();
}
template <typename TMsg>
bool IsInstance(std::enable_if_t<std::is_base_of<Message, TMsg>::value && !std::is_same<Message, TMsg>::value, void>* = NULL) const { // template will be selected when specifying Message children types
return IsMessage() && Fd->message_type() == TMsg::descriptor();
}
bool IsString() const {
return CppType() == FieldDescriptor::CPPTYPE_STRING;
}
bool IsMessage() const {
return CppType() == FieldDescriptor::CPPTYPE_MESSAGE;
}
bool HasSameType(const TConstField& other) const {
if (CppType() != other.CppType())
return false;
if (IsMessage() && Field()->message_type() != other.Field()->message_type())
return false;
if (CppType() == FieldDescriptor::CPPTYPE_ENUM && Field()->enum_type() != other.Field()->enum_type())
return false;
return true;
}
protected:
bool IsRepeated() const {
return Fd->is_repeated();
}
FieldDescriptor::CppType CppType() const {
return Fd->cpp_type();
}
const Reflection& Refl() const {
return *Msg.GetReflection();
}
[[noreturn]] void RaiseUnknown() const {
ythrow yexception() << "Unknown field cpp-type: " << (size_t)CppType();
}
bool IsSameField(const TConstField& other) const {
return &Parent() == &other.Parent() && Field() == other.Field();
}
protected:
const Message& Msg;
const FieldDescriptor* Fd;
};
class TMutableField: public TConstField {
public:
TMutableField(Message& msg, const FieldDescriptor* fd)
: TConstField(msg, fd)
{
}
static TMaybe<TMutableField> ByPath(Message& msg, const TStringBuf& path, bool createPath = false);
static TMaybe<TMutableField> ByPath(Message& msg, const TVector<const FieldDescriptor*>& fieldsPath, bool createPath = false);
static TMaybe<TMutableField> ByPath(Message& msg, const TFieldPath& fieldsPath, bool createPath = false);
Message* MutableParent() {
return Mut();
}
template <typename T>
inline void Set(T value, size_t index = 0);
template <typename T>
inline void Add(T value);
inline void MergeFrom(const TConstField& src);
inline void Clear() {
Refl().ClearField(Mut(), Fd);
}
/*
void Swap(TMutableField& f) {
Y_ASSERT(Field() == f.Field());
// not implemented yet, TODO: implement when Reflection::Mutable(Ptr)RepeatedField
// is ported into arcadia protobuf library from up-stream.
}
*/
inline void RemoveLast() {
Y_ASSERT(HasValue());
if (IsRepeated())
Refl().RemoveLast(Mut(), Fd);
else
Clear();
}
inline void SwapElements(size_t index1, size_t index2) {
Y_ASSERT(IsRepeated());
Y_ASSERT(index1 < Size());
Y_ASSERT(index2 < Size());
if (index1 == index2)
return;
Refl().SwapElements(Mut(), Fd, index1, index2);
}
inline void Remove(size_t index) {
if (index >= Size())
return;
// Move to the end
for (size_t i = index, size = Size(); i < size - 1; ++i)
SwapElements(i, i + 1);
RemoveLast();
}
Message* MutableMessage(size_t index = 0) {
Y_ASSERT(IsMessage());
if (IsRepeated()) {
Y_ASSERT(index < Size());
return Refl().MutableRepeatedMessage(Mut(), Fd, index);
} else {
Y_ASSERT(index == 0);
return Refl().MutableMessage(Mut(), Fd);
}
}
template <typename TMsg>
inline TMsg* AddMessage() {
return CheckedCast<TMsg*>(AddMessage());
}
inline Message* AddMessage() {
Y_ASSERT(IsMessage() && IsRepeated());
return Refl().AddMessage(Mut(), Fd);
}
private:
Message* Mut() {
return const_cast<Message*>(&Msg);
}
template <typename T>
inline void MergeValue(T srcValue);
};
// template implementations
template <typename T>
inline typename TSelectCppType<T>::T TConstField::Get(size_t index) const {
Y_ASSERT(index < Size() || !Fd->is_repeated() && index == 0); // Get for single fields is always allowed because of default values
#define TMP_MACRO_FOR_CPPTYPE(CPPTYPE) \
case CPPTYPE: \
return CompatCast<CPPTYPE, TSelectCppType<T>::Result>(TSimpleFieldTraits<CPPTYPE>::Get(Msg, Fd, index));
switch (CppType()) {
APPLY_TMP_MACRO_FOR_ALL_CPPTYPES()
default:
RaiseUnknown();
}
#undef TMP_MACRO_FOR_CPPTYPE
}
template <typename T>
inline void TMutableField::Set(T value, size_t index) {
Y_ASSERT(!IsRepeated() && index == 0 || index < Size());
#define TMP_MACRO_FOR_CPPTYPE(CPPTYPE) \
case CPPTYPE: \
TSimpleFieldTraits<CPPTYPE>::Set(*Mut(), Fd, CompatCast<TSelectCppType<T>::Result, CPPTYPE>(value), index); \
break;
switch (CppType()) {
APPLY_TMP_MACRO_FOR_ALL_CPPTYPES()
default:
RaiseUnknown();
}
#undef TMP_MACRO_FOR_CPPTYPE
}
template <typename T>
inline void TMutableField::Add(T value) {
#define TMP_MACRO_FOR_CPPTYPE(CPPTYPE) \
case CPPTYPE: \
TSimpleFieldTraits<CPPTYPE>::Add(*Mut(), Fd, CompatCast<TSelectCppType<T>::Result, CPPTYPE>(value)); \
break;
switch (CppType()) {
APPLY_TMP_MACRO_FOR_ALL_CPPTYPES()
default:
RaiseUnknown();
}
#undef TMP_MACRO_FOR_CPPTYPE
}
template <typename T>
inline void TMutableField::MergeValue(T srcValue) {
Add(srcValue);
}
template <>
inline void TMutableField::MergeValue<const Message*>(const Message* srcValue) {
if (IsRepeated()) {
Add(srcValue);
} else {
MutableMessage()->MergeFrom(*srcValue);
}
}
inline void TMutableField::MergeFrom(const TConstField& src) {
Y_ASSERT(HasSameType(src));
if (IsSameField(src))
return;
#define TMP_MACRO_FOR_CPPTYPE(CPPTYPE) \
case CPPTYPE: { \
for (size_t itemIdx = 0; itemIdx < src.Size(); ++itemIdx) { \
MergeValue(TSimpleFieldTraits<CPPTYPE>::Get(src.Parent(), src.Field(), itemIdx)); \
} \
break; \
}
switch (CppType()) {
APPLY_TMP_MACRO_FOR_ALL_CPPTYPES()
default:
RaiseUnknown();
}
#undef TMP_MACRO_FOR_CPPTYPE
}
}
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