118 lines
2.9 KiB
C++
118 lines
2.9 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 "BlockingProgressEstimator.h"
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#include "Include.h"
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using namespace nr2a;
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Consume::~Consume()
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{
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}
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/*static*/ListExpr Consume::MapType(ListExpr args)
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{
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ListExpr result = nl->TypeError();
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if ((!nl->HasLength(args, 1)) ||
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(!listutils::isTupleStream(nl->First(args))))
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{
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return listutils::typeError("Expecting a tuple stream as input");
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}
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//ListExpr attributesTypes = nl->Second(nl->Second(nl->First(args)));
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//AutoWrite(attributesTypes);
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//bool arelFound = false;
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//listForeach(attributesTypes, current)
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//{
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// const ListExpr currentType = nl->Second(current);
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// if (nl->HasMinLength(currentType, 2)
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// && listutils::isSymbol(nl->First(currentType), ARel::BasicType()))
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// {
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// arelFound = true;
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// break;
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// }
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//}
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//if (!arelFound)
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//{
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// return listutils::typeError("Input stream is expected to have at "
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// "least one attribute of type arel2");
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//}
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result = nl->TwoElemList(nl->SymbolAtom(NRel::BasicType()),
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nl->Second(nl->First(args)));
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return result;
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}
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/*static*/int Consume::SelectFunction(ListExpr args)
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{
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return 0;
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}
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/*static*/ValueMapping Consume::functions[] = { ConsumeValue, NULL };
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/*
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All provided tuples are added to the resulting nested relation.
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*/
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/*static*/int Consume::ConsumeValue(Word* args, Word& result, int message,
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Word& local, Supplier s)
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{
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int resultInt = 0;
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NRel* nrel = (NRel*) (qp->ResultStorage(s).addr);
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Stream<Tuple> *stream = (Stream<Tuple> *) local.addr;
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switch (message)
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{
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case OPEN:
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case REQUEST:
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if (stream != NULL)
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{
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delete stream;
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}
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stream = new Stream<Tuple>(args[0]);
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local.addr = stream;
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//break;
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stream->open();
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Tuple* tuple;
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while ((tuple = stream->request()) != 0)
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{
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nrel->AppendTuple(tuple);
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}
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stream->close();
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result.setAddr(nrel);
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//break;
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//case CLOSE:
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delete stream;
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break;
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}
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return resultInt;
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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 Consume::costEstimators[] =
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{ BlockingProgressEstimator::Build };
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