ClickHouse/dbms/include/DB/Dictionaries/DictionarySourceFactory.h

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