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65 lines
1.4 KiB
C++
65 lines
1.4 KiB
C++
#pragma once
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#include <DB/Core/Block.h>
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#include <DB/IO/WriteBuffer.h>
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#include <DB/DataStreams/IRowOutputStream.h>
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namespace DB
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{
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/** Поток для вывода данных в формате JSON.
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*/
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class JSONRowOutputStream : public IRowOutputStream
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{
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public:
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JSONRowOutputStream(WriteBuffer & ostr_, const Block & sample_);
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void writeField(const Field & field) 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 writePrefix() override;
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void writeSuffix() 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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dst_ostr.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 setTotals(const Block & totals_) override { totals = totals_; }
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void setExtremes(const Block & extremes_) override { extremes = extremes_; }
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String getContentType() const override { return "application/json; charset=UTF-8"; }
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protected:
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void writeRowsBeforeLimitAtLeast();
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virtual void writeTotals();
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virtual void writeExtremes();
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WriteBuffer & dst_ostr;
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std::unique_ptr<WriteBuffer> validating_ostr; /// Валидирует UTF-8 последовательности.
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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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Block totals;
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Block extremes;
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};
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}
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