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https://github.com/ClickHouse/ClickHouse.git
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75 lines
1.5 KiB
C++
75 lines
1.5 KiB
C++
#pragma once
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#include <Poco/Util/AbstractConfiguration.h>
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#include <Poco/Exception.h>
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#include <common/Types.h>
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#include <ext/singleton.h>
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/** @brief Class that lets you know if a search engine or operating system belongs
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* another search engine or operating system, respectively.
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* Information about the hierarchy of regions is downloaded from the database.
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*/
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class TechDataHierarchy
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{
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private:
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UInt8 os_parent[256] {};
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UInt8 se_parent[256] {};
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public:
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void reload();
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/// Has corresponding section in configuration file.
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static bool isConfigured(const Poco::Util::AbstractConfiguration & config);
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/// The "belongs" relation.
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bool isOSIn(UInt8 lhs, UInt8 rhs) const
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{
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while (lhs != rhs && os_parent[lhs])
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lhs = os_parent[lhs];
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return lhs == rhs;
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}
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bool isSEIn(UInt8 lhs, UInt8 rhs) const
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{
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while (lhs != rhs && se_parent[lhs])
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lhs = se_parent[lhs];
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return lhs == rhs;
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}
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UInt8 OSToParent(UInt8 x) const
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{
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return os_parent[x];
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}
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UInt8 SEToParent(UInt8 x) const
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{
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return se_parent[x];
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}
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/// To the topmost ancestor.
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UInt8 OSToMostAncestor(UInt8 x) const
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{
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while (os_parent[x])
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x = os_parent[x];
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return x;
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}
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UInt8 SEToMostAncestor(UInt8 x) const
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{
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while (se_parent[x])
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x = se_parent[x];
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return x;
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}
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};
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class TechDataHierarchySingleton : public ext::singleton<TechDataHierarchySingleton>, public TechDataHierarchy {};
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