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#include <Processors/Formats/Impl/JSONColumnsBlockOutputFormat.h>
#include <IO/WriteHelpers.h>
#include <IO/WriteBufferValidUTF8.h>
#include <Formats/FormatFactory.h>
#include <Formats/JSONUtils.h>
namespace DB
{
JSONColumnsBlockOutputFormat::JSONColumnsBlockOutputFormat(WriteBuffer & out_, const Block & header_, const FormatSettings & format_settings_, bool validate_utf8, size_t indent_)
: JSONColumnsBlockOutputFormatBase(out_, header_, format_settings_, validate_utf8), indent(indent_), header(header_)
{
names = JSONUtils::makeNamesValidJSONStrings(header_.getNames(), format_settings, validate_utf8);
}
void JSONColumnsBlockOutputFormat::writeChunkStart()
{
JSONUtils::writeObjectStart(*ostr, indent);
}
void JSONColumnsBlockOutputFormat::writeColumnStart(size_t column_index)
{
JSONUtils::writeCompactArrayStart(*ostr, indent + 1, names[column_index].data());
}
void JSONColumnsBlockOutputFormat::writeChunkEnd()
{
/// Write empty chunk
if (!written_rows)
{
const auto & columns = header.getColumns();
for (size_t i = 0; i != columns.size(); ++i)
{
writeColumnStart(i);
writeColumn(*columns[i], *serializations[i]);
writeColumnEnd(i == columns.size() - 1);
}
}
JSONUtils::writeObjectEnd(*ostr, indent);
writeChar('\n', *ostr);
}
void registerOutputFormatJSONColumns(FormatFactory & factory)
{
factory.registerOutputFormat("JSONColumns", [](
WriteBuffer & buf,
const Block & sample,
const FormatSettings & format_settings)
{
return std::make_shared<JSONColumnsBlockOutputFormat>(buf, sample, format_settings, format_settings.json.validate_utf8);
});
}
}
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