ClickHouse/src/Formats/ProtobufSerializer.h

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#pragma once
2021-10-27 23:10:39 +00:00
#include "config_formats.h"
#if USE_PROTOBUF
# include <Columns/IColumn.h>
namespace google::protobuf { class Descriptor; }
namespace DB
{
class ProtobufReader;
class ProtobufWriter;
class IDataType;
using DataTypePtr = std::shared_ptr<const IDataType>;
using DataTypes = std::vector<DataTypePtr>;
/// Utility class, does all the work for serialization in the Protobuf format.
class ProtobufSerializer
{
public:
virtual ~ProtobufSerializer() = default;
virtual void setColumns(const ColumnPtr * columns, size_t num_columns) = 0;
virtual void writeRow(size_t row_num) = 0;
virtual void setColumns(const MutableColumnPtr * columns, size_t num_columns) = 0;
virtual void readRow(size_t row_num) = 0;
virtual void insertDefaults(size_t row_num) = 0;
static std::unique_ptr<ProtobufSerializer> create(
const Strings & column_names,
const DataTypes & data_types,
std::vector<size_t> & missing_column_indices,
const google::protobuf::Descriptor & message_descriptor,
bool with_length_delimiter,
ProtobufReader & reader);
static std::unique_ptr<ProtobufSerializer> create(
const Strings & column_names,
const DataTypes & data_types,
const google::protobuf::Descriptor & message_descriptor,
bool with_length_delimiter,
ProtobufWriter & writer);
};
}
#endif