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#ifndef _NearQuery_h_
#define _NearQuery_h_
//
// NearQuery.h
//
// NearQuery: An operator query that filters matches by proximity.
//
// Part of the ht://Dig package <http://www.htdig.org/>
// Copyright (c) 1995-2004 The ht://Dig Group
// For copyright details, see the file COPYING in your distribution
// or the GNU Library General Public License (LGPL) version 2 or later
// <http://www.gnu.org/copyleft/lgpl.html>
//
// $Id: NearQuery.h,v 1.4 2004/05/28 13:15:24 lha Exp $
//
#ifdef HAVE_CONFIG_H
#include "htconfig.h"
#endif
#include "OperatorQuery.h"
class NearQuery : public OperatorQuery
{
public:
// binary fashion
NearQuery(Query *left, Query *right, unsigned int dist) :
distance(dist)
{ Add(left); Add(right); }
// n-ary fashion -- will ignore operands for n>2
NearQuery(unsigned int dist = 10) :
distance(dist) {}
private:
// get results from operands and filter
ResultList *Evaluate();
// create a result with neighboring matches
ResultList *Near(const ResultList &, const ResultList &);
// merge neighboring location lists
List *MergeLocations(const List &, const List &);
String OperatorString() const;
unsigned int distance;
};
#endif
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