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#pragma once
#include <Core/Block.h>
#include <IO/Progress.h>
#include <IO/WriteBuffer.h>
#include <IO/PeekableWriteBuffer.h>
#include <Common/Stopwatch.h>
#include <Processors/Formats/OutputFormatWithUTF8ValidationAdaptor.h>
#include <Processors/Formats/RowOutputFormatWithExceptionHandlerAdaptor.h>
#include <Formats/FormatSettings.h>
namespace DB
{
/** Stream for output data in JSON format.
*/
class JSONRowOutputFormat : public RowOutputFormatWithExceptionHandlerAdaptor<RowOutputFormatWithUTF8ValidationAdaptor, bool>
{
public:
JSONRowOutputFormat(
WriteBuffer & out_,
const Block & header,
const FormatSettings & settings_,
bool yield_strings_);
String getName() const override { return "JSONRowOutputFormat"; }
void onProgress(const Progress & value) override;
String getContentType() const override { return "application/json; charset=UTF-8"; }
void setRowsBeforeLimit(size_t rows_before_limit_) override
{
statistics.applied_limit = true;
statistics.rows_before_limit = rows_before_limit_;
}
protected:
void writeField(const IColumn & column, const ISerialization & serialization, size_t row_num) override;
void writeFieldDelimiter() override;
void writeRowStartDelimiter() override;
void writeRowEndDelimiter() override;
void writeRowBetweenDelimiter() override;
void writePrefix() override;
void writeSuffix() override;
void writeMinExtreme(const Columns & columns, size_t row_num) override;
void writeMaxExtreme(const Columns & columns, size_t row_num) override;
void writeTotals(const Columns & columns, size_t row_num) override;
bool supportTotals() const override { return true; }
bool supportExtremes() const override { return true; }
void writeBeforeTotals() override;
void writeAfterTotals() override;
void writeBeforeExtremes() override;
void writeAfterExtremes() override;
void finalizeImpl() override;
void resetFormatterImpl() override;
virtual void writeExtremesElement(const char * title, const Columns & columns, size_t row_num);
void onRowsReadBeforeUpdate() override { row_count = getRowsReadBefore(); }
size_t field_number = 0;
size_t row_count = 0;
Names names; /// The column names are pre-escaped to be put into JSON string literal.
FormatSettings settings;
bool yield_strings;
WriteBuffer * ostr;
};
}
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