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71 lines
2.5 KiB
C++
71 lines
2.5 KiB
C++
#pragma once
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#include <Compression/CompressionInfo.h>
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#include <Compression/ICompressionCodec.h>
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#include <DataTypes/IDataType.h>
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#include <Parsers/IAST_fwd.h>
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#include <Common/IFactoryWithAliases.h>
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#include <functional>
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#include <memory>
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#include <optional>
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#include <unordered_map>
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namespace DB
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{
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class ICompressionCodec;
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using CompressionCodecPtr = std::shared_ptr<ICompressionCodec>;
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using CodecNameWithLevel = std::pair<String, std::optional<int>>;
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/** Creates a codec object by name of compression algorithm family and parameters.
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*/
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class CompressionCodecFactory final : private boost::noncopyable
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{
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protected:
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using Creator = std::function<CompressionCodecPtr(const ASTPtr & parameters)>;
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using CreatorWithType = std::function<CompressionCodecPtr(const ASTPtr & parameters, DataTypePtr column_type)>;
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using SimpleCreator = std::function<CompressionCodecPtr()>;
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using CompressionCodecsDictionary = std::unordered_map<String, CreatorWithType>;
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using CompressionCodecsCodeDictionary = std::unordered_map<UInt8, CreatorWithType>;
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public:
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static CompressionCodecFactory & instance();
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/// Return default codec (currently LZ4)
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CompressionCodecPtr getDefaultCodec() const;
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/// Get codec by AST and possible column_type
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/// some codecs can use information about type to improve inner settings
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/// but every codec should be able to work without information about type
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CompressionCodecPtr get(const ASTPtr & ast, DataTypePtr column_type = nullptr) const;
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/// Get codec by method byte (no params available)
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CompressionCodecPtr get(const UInt8 byte_code) const;
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/// For backward compatibility with config settings
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CompressionCodecPtr get(const String & family_name, std::optional<int> level) const;
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/// Register codec with parameters and column type
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void registerCompressionCodecWithType(const String & family_name, std::optional<UInt8> byte_code, CreatorWithType creator);
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/// Register codec with parameters
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void registerCompressionCodec(const String & family_name, std::optional<UInt8> byte_code, Creator creator);
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/// Register codec without parameters
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void registerSimpleCompressionCodec(const String & family_name, std::optional<UInt8> byte_code, SimpleCreator creator);
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protected:
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CompressionCodecPtr getImpl(const String & family_name, const ASTPtr & arguments, DataTypePtr column_type) const;
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private:
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CompressionCodecsDictionary family_name_with_codec;
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CompressionCodecsCodeDictionary family_code_with_codec;
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CompressionCodecPtr default_codec;
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CompressionCodecFactory();
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};
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}
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