58 lines
1.8 KiB
C++
58 lines
1.8 KiB
C++
/*=============================================================================
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# Filename: Strategy.h
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# Author: Bookug Lobert
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# Mail: zengli-bookug@pku.edu.cn
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# Last Modified: 2016-05-07 16:28
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# Description:
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=============================================================================*/
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#ifndef _DATABASE_STRATEGY_H
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#define _DATABASE_STRATEGY_H
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#include "../Util/Util.h"
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#include "../Util/Triple.h"
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#include "Join.h"
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#include "../Query/IDList.h"
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#include "../Query/SPARQLquery.h"
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#include "../Query/BasicQuery.h"
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#include "../KVstore/KVstore.h"
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#include "../VSTree/VSTree.h"
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#include "../Query/ResultFilter.h"
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class Strategy
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{
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public:
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Strategy();
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Strategy(KVstore*, VSTree*, TYPE_TRIPLE_NUM*, TYPE_PREDICATE_ID, TYPE_ENTITY_LITERAL_ID);
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~Strategy();
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//select efficient strategy to do the sparql query
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bool handle(SPARQLquery&, ResultFilter* _result_filter = NULL);
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private:
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int method;
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KVstore* kvstore;
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VSTree* vstree;
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TYPE_TRIPLE_NUM* pre2num;
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TYPE_PREDICATE_ID limitID_predicate;
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TYPE_ENTITY_LITERAL_ID limitID_literal;
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//NOTICE: even the ID type is int, it is no problem and no waste that we use unsigned in answer
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//(because -1, -2 or other invalid IDs can not be in answer)
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void handler0(BasicQuery*, vector<unsigned*>&, ResultFilter* _result_filter = NULL);
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void handler1(BasicQuery*, vector<unsigned*>&);
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void handler2(BasicQuery*, vector<unsigned*>&);
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void handler3(BasicQuery*, vector<unsigned*>&);
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void handler4(BasicQuery*, vector<unsigned*>&);
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void handler5(BasicQuery*, vector<unsigned*>&);
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//QueryHandler *dispatch;
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//void prepare_handler();
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};
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//function pointer array
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static const unsigned QUERY_HANDLER_NUM = 4;
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typedef void (Strategy::*QueryHandler[QUERY_HANDLER_NUM]) (BasicQuery*, vector<unsigned*>&);
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//QueryHandler dispatch;
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#endif //_DATABASE_STRATEGY_H
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