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50 lines
1.2 KiB
C++
50 lines
1.2 KiB
C++
//
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// OperatorQuery.cc
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//
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// OperatorQuery: (abstract class) a query that combines result lists
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// returned by other queries kept in an operand list.
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// how they are combined is tbd by the concrete classes.
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//
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// Part of the ht://Dig package <http://www.htdig.org/>
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// Copyright (c) 1995-2004 The ht://Dig Group
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// For copyright details, see the file COPYING in your distribution
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// or the GNU Library General Public License (LGPL) version 2 or later
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// <http://www.gnu.org/copyleft/lgpl.html>
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//
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// $Id: OperatorQuery.cc,v 1.4 2004/05/28 13:15:24 lha Exp $
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//
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#include "OperatorQuery.h"
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//
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// return a string with the query as a boolean expression
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// descends recursively over the operand
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//
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String
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OperatorQuery::GetLogicalWords() const
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{
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ListCursor c;
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String out;
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out << "(";
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if(operands.Count())
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{
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operands.Start_Get(c);
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out << ((Query *) operands.Get_Next(c))->GetLogicalWords();
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Query *next = (Query *) operands.Get_Next(c);
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while(next)
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{
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out << " " << OperatorString() << " ";
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if(next)
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{
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out << next->GetLogicalWords();
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}
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else
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{
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out << "*nothing*";
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}
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next = (Query *) operands.Get_Next(c);
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}
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}
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out << ")";
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return out;
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}
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