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123 lines
2.9 KiB
C++
123 lines
2.9 KiB
C++
#pragma once
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#include <cmath> /// std::isfinite
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#include <DB/DataTypes/IDataType.h>
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#include <DB/IO/ReadHelpers.h>
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#include <DB/IO/WriteHelpers.h>
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namespace DB
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{
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/** Реализует часть интерфейса IDataType, общую для всяких чисел
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* - ввод и вывод в текстовом виде.
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*/
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template <typename FType>
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class IDataTypeNumber : public IDataType
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{
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public:
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typedef FType FieldType;
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bool isNumeric() const { return true; }
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bool behavesAsNumber() const { return true; }
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void serializeText(const Field & field, WriteBuffer & ostr) const
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{
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writeText(get<typename NearestFieldType<FieldType>::Type>(field), ostr);
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}
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inline void deserializeText(Field & field, ReadBuffer & istr) const;
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void serializeTextEscaped(const Field & field, WriteBuffer & ostr) const
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{
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serializeText(field, ostr);
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}
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void deserializeTextEscaped(Field & field, ReadBuffer & istr) const
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{
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deserializeText(field, istr);
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}
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void serializeTextQuoted(const Field & field, WriteBuffer & ostr) const
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{
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serializeText(field, ostr);
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}
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void deserializeTextQuoted(Field & field, ReadBuffer & istr) const
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{
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deserializeText(field, istr);
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}
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inline void serializeTextJSON(const Field & field, WriteBuffer & ostr) const;
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size_t getSizeOfField() const { return sizeof(FieldType); }
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Field getDefault() const
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{
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return typename NearestFieldType<FieldType>::Type();
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}
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};
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template <typename FType> inline void IDataTypeNumber<FType>::serializeTextJSON(const Field & field, WriteBuffer & ostr) const
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{
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serializeText(field, ostr);
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}
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template <> inline void IDataTypeNumber<Int64>::serializeTextJSON(const Field & field, WriteBuffer & ostr) const
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{
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writeChar('"', ostr);
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serializeText(field, ostr);
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writeChar('"', ostr);
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}
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template <> inline void IDataTypeNumber<UInt64>::serializeTextJSON(const Field & field, WriteBuffer & ostr) const
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{
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writeChar('"', ostr);
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serializeText(field, ostr);
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writeChar('"', ostr);
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}
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template <> inline void IDataTypeNumber<Float32>::serializeTextJSON(const Field & field, WriteBuffer & ostr) const
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{
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if (likely(std::isfinite(get<Float64>(field))))
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serializeText(field, ostr);
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else
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writeCString("null", ostr);
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}
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template <> inline void IDataTypeNumber<Float64>::serializeTextJSON(const Field & field, WriteBuffer & ostr) const
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{
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if (likely(std::isfinite(get<Float64>(field))))
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serializeText(field, ostr);
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else
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writeCString("null", ostr);
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}
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template <typename FType> inline void IDataTypeNumber<FType>::deserializeText(Field & field, ReadBuffer & istr) const
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{
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typename NearestFieldType<FieldType>::Type x;
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readIntTextUnsafe(x, istr);
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field = x;
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}
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template <> inline void IDataTypeNumber<Float64>::deserializeText(Field & field, ReadBuffer & istr) const
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{
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Float64 x;
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readText(x, istr);
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field = x;
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}
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template <> inline void IDataTypeNumber<Float32>::deserializeText(Field & field, ReadBuffer & istr) const
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{
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Float64 x;
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readText(x, istr);
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field = x;
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}
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}
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