83 lines
1.9 KiB
C++
83 lines
1.9 KiB
C++
/*
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----
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This file is part of SECONDO.
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Copyright (C) 2004, University in Hagen, Department of Computer Science,
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Database Systems for New Applications.
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SECONDO is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License, or
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(at your option) any later version.
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SECONDO is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with SECONDO; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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----
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*/
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#include "Include.h"
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using namespace nr2a;
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Aconsume::~Aconsume()
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{
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}
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/*static*/ListExpr Aconsume::MapType(ListExpr args)
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{
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ListExpr result = nl->TypeError();
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if ((nl->ListLength(args) == 1) && listutils::isStream(nl->First(args)))
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{
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result = nl->TwoElemList(nl->SymbolAtom(ARel::BasicType()),
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nl->Second(nl->First(args)));
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}
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return result;
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}
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ValueMapping Aconsume::functions[] = { AconsumeValue, NULL };
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/*static*/int Aconsume::SelectFunction(ListExpr args)
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{
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return 0;
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}
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/*
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All provided tuples are added to the resulting attribute relation.
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*/
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/*static*/int Aconsume::AconsumeValue(Word* args, Word& result,
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int message, Word& local, Supplier s)
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{
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Word w = qp->ResultStorage(s);
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ARel* arel = (ARel*) (w.addr);
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arel->Clear();
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Stream<Tuple> stream(args[0]);
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stream.open();
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Tuple* tup;
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while ((tup = stream.request()) != NULL)
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{
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arel->AppendTuple(tup);
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}
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stream.close();
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result.setAddr(arel);
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return 0;
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}
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/*
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List of functions for cost estimation.
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*/
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CreateCostEstimation Aconsume::costEstimators[] =
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{ BlockingProgressEstimator::Build };
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