ClickHouse/dbms/AggregateFunctions/AggregateFunctionCombinatorFactory.h
Ivan 97f2a2213e
Move all folders inside /dbms one level up (#9974)
* Move some code outside dbms/src folder
* Fix paths
2020-04-02 02:51:21 +03:00

38 lines
879 B
C++

#pragma once
#include <AggregateFunctions/IAggregateFunctionCombinator.h>
#include <string>
#include <unordered_map>
namespace DB
{
/** Create aggregate function combinator by matching suffix in aggregate function name.
*/
class AggregateFunctionCombinatorFactory final: private boost::noncopyable
{
private:
using Dict = std::unordered_map<std::string, AggregateFunctionCombinatorPtr>;
Dict dict;
public:
static AggregateFunctionCombinatorFactory & instance();
/// Not thread safe. You must register before using tryGet.
void registerCombinator(const AggregateFunctionCombinatorPtr & value);
/// Example: if the name is 'avgIf', it will return combinator -If.
AggregateFunctionCombinatorPtr tryFindSuffix(const std::string & name) const;
const Dict & getAllAggregateFunctionCombinators() const
{
return dict;
}
};
}