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84 lines
2.4 KiB
C++
84 lines
2.4 KiB
C++
#pragma once
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#include <Core/Block.h>
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#include <IO/Progress.h>
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#include <IO/WriteBuffer.h>
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#include <Common/Stopwatch.h>
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#include <Processors/Formats/IRowOutputFormat.h>
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#include <Formats/FormatSettings.h>
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namespace DB
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{
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/** Stream for output data in JSON format.
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*/
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class JSONRowOutputFormat : public IRowOutputFormat
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{
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public:
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JSONRowOutputFormat(WriteBuffer & out_, const Block & header, FormatFactory::WriteCallback callback, const FormatSettings & settings_);
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String getName() const override { return "JSONRowOutputFormat"; }
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void writeField(const IColumn & column, const IDataType & type, size_t row_num) override;
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void writeFieldDelimiter() override;
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void writeRowStartDelimiter() override;
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void writeRowEndDelimiter() override;
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void writeRowBetweenDelimiter() override;
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void writePrefix() override;
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void writeSuffix() override;
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void writeMinExtreme(const Columns & columns, size_t row_num) override;
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void writeMaxExtreme(const Columns & columns, size_t row_num) override;
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void writeTotals(const Columns & columns, size_t row_num) override;
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void writeBeforeTotals() override;
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void writeAfterTotals() override;
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void writeBeforeExtremes() override;
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void writeAfterExtremes() override;
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void writeLastSuffix() override;
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void flush() override
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{
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ostr->next();
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if (validating_ostr)
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out.next();
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}
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void setRowsBeforeLimit(size_t rows_before_limit_) override
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{
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applied_limit = true;
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rows_before_limit = rows_before_limit_;
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}
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void onProgress(const Progress & value) override;
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String getContentType() const override { return "application/json; charset=UTF-8"; }
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protected:
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virtual void writeTotalsField(const IColumn & column, const IDataType & type, size_t row_num);
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virtual void writeExtremesElement(const char * title, const Columns & columns, size_t row_num);
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virtual void writeTotalsFieldDelimiter() { writeFieldDelimiter(); }
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void writeRowsBeforeLimitAtLeast();
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void writeStatistics();
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std::unique_ptr<WriteBuffer> validating_ostr; /// Validates UTF-8 sequences, replaces bad sequences with replacement character.
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WriteBuffer * ostr;
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size_t field_number = 0;
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size_t row_count = 0;
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bool applied_limit = false;
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size_t rows_before_limit = 0;
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NamesAndTypes fields;
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Progress progress;
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Stopwatch watch;
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FormatSettings settings;
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};
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}
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