/*=============================================================================
# Filename: ResultFilter.h
# Author: Jiaqi, Chen
# Mail: chenjiaqi93@163.com
# Last Modified: 2016-05-03 15:36
# Description:
=============================================================================*/

#ifndef _QUERY_RESULTFILTER_H
#define _QUERY_RESULTFILTER_H

#include "BasicQuery.h"
#include "SPARQLquery.h"
#include "../Util/Util.h"

class ResultFilter
{
	private:
		static const int MAX_SIZE = 1048576;
		inline int hash(unsigned int x)
		{
			x = (x + 0x7ed55d16) + (x << 12);
			x = (x ^ 0xc761c23c) ^ (x >> 19);
			x = (x + 0x165667b1) + (x << 5);
			x = (x + 0xd3a2646c) ^ (x << 9);
			x = (x + 0xfd7046c5) + (x << 3);
			x = (x ^ 0xb55a4f09) ^ (x >> 16);
			return x & (MAX_SIZE - 1);
		}

		//var	valid	hash_table
		std::map<std::string, pair<int, std::vector<int> > > result_filter;

	public:
		void addVar(std::string var);
		void changeResultHashTable(SPARQLquery &query, int value);
		void candFilterWithResultHashTable(BasicQuery &basicquery);
};


#endif // _QUERY_RESULTFILTER_H