mirror of
https://github.com/ClickHouse/ClickHouse.git
synced 2024-09-21 17:20:50 +00:00
83 lines
2.1 KiB
C++
83 lines
2.1 KiB
C++
#pragma once
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#include <DB/Core/Block.h>
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#include <DB/Dictionaries/DictionaryStructure.h>
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#include <DB/Dictionaries/FileDictionarySource.h>
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#include <DB/Dictionaries/MySQLDictionarySource.h>
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#include <DB/Dictionaries/ClickHouseDictionarySource.h>
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#include <DB/DataTypes/DataTypesNumberFixed.h>
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#include <Yandex/singleton.h>
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#include <memory>
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namespace DB
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{
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namespace
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{
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Block createSampleBlock(const DictionaryStructure & dict_struct)
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{
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Block block{
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ColumnWithNameAndType{
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new ColumnUInt64,
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new DataTypeUInt64,
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dict_struct.id_name
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}
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};
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for (const auto & attribute : dict_struct.attributes)
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block.insert(ColumnWithNameAndType{
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attribute.type->createColumn(), attribute.type, attribute.name
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});
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return block;
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}
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}
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/// creates IDictionarySource instance from config and DictionaryStructure
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class DictionarySourceFactory : public Singleton<DictionarySourceFactory>
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{
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public:
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DictionarySourcePtr create(Poco::Util::AbstractConfiguration & config,
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const std::string & config_prefix,
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const DictionaryStructure & dict_struct,
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Context & context) const
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{
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Poco::Util::AbstractConfiguration::Keys keys;
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config.keys(config_prefix, keys);
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if (keys.size() != 1)
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throw Exception{
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"Element dictionary.source should have exactly one child element",
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ErrorCodes::EXCESSIVE_ELEMENT_IN_CONFIG
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};
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auto sample_block = createSampleBlock(dict_struct);
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const auto & source_type = keys.front();
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if ("file" == source_type)
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{
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const auto filename = config.getString(config_prefix + ".file.path");
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const auto format = config.getString(config_prefix + ".file.format");
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return std::make_unique<FileDictionarySource>(filename, format, sample_block, context);
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}
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else if ("mysql" == source_type)
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{
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return std::make_unique<MySQLDictionarySource>(dict_struct, config, config_prefix + ".mysql", sample_block);
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}
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else if ("clickhouse" == source_type)
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{
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return std::make_unique<ClickHouseDictionarySource>(dict_struct, config, config_prefix + ".clickhouse",
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sample_block, context);
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}
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throw Exception{
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"Unknown dictionary source type: " + source_type,
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ErrorCodes::UNKNOWN_ELEMENT_IN_CONFIG
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};
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}
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};
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}
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