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93 lines
3.3 KiB
C++
93 lines
3.3 KiB
C++
#pragma once
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#include <memory>
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#include <cstddef>
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#include <Core/Types.h>
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namespace DB
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{
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class ReadBuffer;
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class WriteBuffer;
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struct FormatSettings;
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class IColumn;
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/** Allow to customize an existing data type and set a different name and/or text serialization/deserialization methods.
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* See use in IPv4 and IPv6 data types, and also in SimpleAggregateFunction.
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*/
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class IDataTypeCustomName
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{
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public:
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virtual ~IDataTypeCustomName() {}
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virtual String getName() const = 0;
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};
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class IDataTypeCustomTextSerialization
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{
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public:
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virtual ~IDataTypeCustomTextSerialization() {}
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/** Text serialization for displaying on a terminal or saving into a text file, and the like.
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* Without escaping or quoting.
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*/
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virtual void serializeText(const IColumn & column, size_t row_num, WriteBuffer & ostr, const FormatSettings &) const = 0;
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/** Text deserialization without quoting or escaping.
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*/
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virtual void deserializeWholeText(IColumn & column, ReadBuffer & istr, const FormatSettings &) const = 0;
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/** Text serialization with escaping but without quoting.
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*/
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virtual void serializeTextEscaped(const IColumn & column, size_t row_num, WriteBuffer & ostr, const FormatSettings &) const = 0;
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virtual void deserializeTextEscaped(IColumn & column, ReadBuffer & istr, const FormatSettings &) const = 0;
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/** Text serialization as a literal that may be inserted into a query.
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*/
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virtual void serializeTextQuoted(const IColumn & column, size_t row_num, WriteBuffer & ostr, const FormatSettings &) const = 0;
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virtual void deserializeTextQuoted(IColumn & column, ReadBuffer & istr, const FormatSettings &) const = 0;
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/** Text serialization for the CSV format.
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*/
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virtual void serializeTextCSV(const IColumn & column, size_t row_num, WriteBuffer & ostr, const FormatSettings &) const = 0;
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virtual void deserializeTextCSV(IColumn & column, ReadBuffer & istr, const FormatSettings &) const = 0;
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/** Text serialization intended for using in JSON format.
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*/
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virtual void serializeTextJSON(const IColumn & column, size_t row_num, WriteBuffer & ostr, const FormatSettings &) const = 0;
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virtual void deserializeTextJSON(IColumn & column, ReadBuffer & istr, const FormatSettings &) const = 0;
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/** Text serialization for putting into the XML format.
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*/
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virtual void serializeTextXML(const IColumn & column, size_t row_num, WriteBuffer & ostr, const FormatSettings & settings) const = 0;
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};
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using DataTypeCustomNamePtr = std::unique_ptr<const IDataTypeCustomName>;
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using DataTypeCustomTextSerializationPtr = std::unique_ptr<const IDataTypeCustomTextSerialization>;
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/** Describe a data type customization
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*/
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struct DataTypeCustomDesc
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{
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DataTypeCustomNamePtr name;
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DataTypeCustomTextSerializationPtr text_serialization;
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DataTypeCustomDesc(DataTypeCustomNamePtr name_, DataTypeCustomTextSerializationPtr text_serialization_)
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: name(std::move(name_)), text_serialization(std::move(text_serialization_)) {}
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};
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using DataTypeCustomDescPtr = std::unique_ptr<DataTypeCustomDesc>;
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/** A simple implementation of IDataTypeCustomName
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*/
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class DataTypeCustomFixedName : public IDataTypeCustomName
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{
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private:
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String name;
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public:
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DataTypeCustomFixedName(String name_) : name(name_) {}
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String getName() const override { return name; }
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};
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}
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