refactor: split message classes

include/sp/protocol/message/MessagesImpl.h

@@ -0,0 +1,160 @@
+#pragma once
+
+namespace sp {
+namespace details {
+
+
+
+// ID information chunk
+template <typename TBase, std::intmax_t TId>
+class MessageImplStaticNumIdBase : public TBase {
+  public:
+	// Reuse the message ID type defined in the interface
+	using MsgIdType = typename TBase::MsgIdType;
+
+  protected:
+	virtual MsgIdType GetIdImpl() const override {
+		return static_cast<MsgIdType>(TId);
+	}
+};
+
+// Dispatch implementation chunk
+template <typename TBase, typename TActual>
+class MessageImplDispatchBase : public TBase {
+  public:
+	// Reuse the Handler type defined in the interface class
+	using Handler = typename TBase::HandlerType;
+
+  protected:
+	virtual void DispatchImpl(Handler& handler) override {
+		handler.Handle(static_cast<TActual&>(*this));
+	}
+};
+
+
+
+template <typename TBase, typename TFields>
+class MessageImplFieldsBase : public TBase {
+  public:
+	using AllFields = typename details::FieldsBuilder<TFields>::Type;
+
+	template <typename... Args>
+	void Construct(Args... args) {
+		m_Fields = std::make_tuple(args...);
+	}
+
+	AllFields& GetFields() {
+		return m_Fields;
+	}
+
+	const AllFields& GetFields() const {
+		return m_Fields;
+	}
+
+	template <std::size_t FIndex>
+	auto& GetField() {
+		return std::get<FIndex>(GetFields()).GetValue();
+	}
+
+	template <std::size_t FIndex>
+	const auto& GetField() const {
+		return std::get<FIndex>(GetFields()).GetValue();
+	}
+
+	// allow use of enums
+	template <typename E, E FIndex>
+	const auto& GetField() const {
+		return std::get<static_cast<std::size_t>(FIndex)>(this->GetFields()).GetValue();
+	}
+
+  private:
+	AllFields m_Fields;
+};
+
+template <typename TBase>
+class MessageImplFieldsReadBase : public TBase {
+  private:
+	// normal reading
+	template <typename TField>
+	void ReadField(Field<TField, 0>& field, DataBuffer& buffer) {
+		this->ReadData(field.GetValue(), buffer);
+	}
+
+	// reading field in bitfield
+	template <typename TFieldType, typename TField, int IAlignment>
+	void ReadField(Field<TField, IAlignment>& field, TFieldType data, std::size_t offset) {
+		static constexpr std::size_t TotalBitCount = sizeof(TFieldType) * 8;
+		// we suppose that the first element is at the highest bits
+		field.GetValue() = (data >> TotalBitCount - IAlignment - offset) & ((1 << IAlignment) - 1);
+	}
+
+	// reading bitfield
+	template <typename TContainer, typename TFirst, typename... TFields>
+	void ReadField(Field<BitField<TContainer, TFirst, TFields...>, 0>& field, DataBuffer& buffer) {
+		TContainer data;
+		this->ReadData(data, buffer);
+		std::size_t offset = 0;
+		TupleForEach(
+			[data, this, &offset](auto& field) {
+				this->ReadField(field, data, offset);
+				offset += field.GetAlignment();
+			},
+			field.GetValue().GetFields());
+	}
+
+	void ReadImpl(DataBuffer& buffer) override {
+		auto& allFields = this->GetFields();
+		TupleForEach([&buffer, this](auto& field) { this->ReadField(field, buffer); }, allFields);
+	}
+};
+
+template <typename TBase>
+class MessageImplFieldsWriteBase : public TBase {
+  private:
+	// normal writing
+	template <typename TField>
+	void WriteField(Field<TField, 0>& field, DataBuffer& buffer) {
+		this->WriteData(field.GetValue(), buffer);
+	}
+
+	// writing field in bitfield
+	template <typename TFieldType, typename TField, int IAlignment>
+	void WriteField(Field<TField, IAlignment>& field, TFieldType& data, std::size_t offset) {
+		static constexpr std::size_t TotalBitCount = sizeof(TFieldType) * 8;
+		// we suppose that the first element is at the highest bits
+		data |= (field.GetValue() & ((1 << IAlignment) - 1)) << TotalBitCount - IAlignment - offset;
+	}
+
+	// writing bitfield
+	template <typename TContainer, typename TFirst, typename... TFields>
+	void WriteField(Field<BitField<TContainer, TFirst, TFields...>, 0>& field, DataBuffer& buffer) {
+		TContainer data = 0;
+		std::size_t offset = 0;
+		TupleForEach(
+			[&data, this, &offset](auto& field) {
+				this->WriteField(field, data, offset);
+				offset += field.GetAlignment();
+			},
+			field.GetValue().GetFields());
+		this->WriteData(data, buffer);
+	}
+
+	void WriteImpl(DataBuffer& buffer) override {
+		auto& allFields = this->GetFields();
+		TupleForEach([&buffer, this](auto& field) { this->WriteField(field, buffer); }, allFields);
+	}
+};
+
+template <typename TBase>
+class MessageImplFieldsValidBase : public TBase {
+  protected:
+	bool ValidImpl() const override {
+		// Access fields via interface provided in previous chunk
+		// auto& allFields = TBase::GetFields();
+		//...	 // validate all the fields
+		return true;
+	}
+};
+
+}  // namespace details
+}  // namespace sp