101 lines
2.5 KiB
C++
101 lines
2.5 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 "Consume.h"
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#include "../CRel.h"
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#include "../TypeConstructors/CRelTC.h"
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#include <cstdint>
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#include <exception>
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#include "LogMsg.h"
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#include "OperatorUtils.h"
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#include "QueryProcessor.h"
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#include "Stream.h"
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#include <string>
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#include "../TBlock.h"
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#include "../TypeConstructors/TBlockTC.h"
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#include "TypeUtils.h"
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#include "ToTuples.h"
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#include "StreamValueMapping.h"
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using namespace CRelAlgebra;
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using namespace CRelAlgebra::Operators;
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using std::exception;
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using std::string;
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extern NestedList *nl;
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extern QueryProcessor *qp;
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Consume::Consume() :
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Operator(info, ValueMapping, TypeMapping)
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{
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}
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const OperatorInfo Consume::info = OperatorInfo(
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"consume", "stream(tblock) -> rel",
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"_ consume",
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"Creates an ordinary relation from a stream of tuple blocks.",
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"query cities feed consume");
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ListExpr Consume::TypeMapping(ListExpr args)
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{
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ListExpr tupleStream = ToTuples::TypeMapping(args);
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if(!Stream<Tuple>::checkType(tupleStream)){
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// an error
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return tupleStream;
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}
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ListExpr tuple = nl->Second(tupleStream);
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return nl->TwoElemList(listutils::basicSymbol<Relation>(),
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tuple);
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}
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int Consume::ValueMapping(Word* args, Word &result, int message ,
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Word& local, Supplier s)
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{
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result = qp->ResultStorage(s);
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GenericRelation* rel = (GenericRelation*) result.addr;
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if(rel->GetNoTuples() > 0)
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{
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rel->Clear();
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}
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Word res;
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::ValueMapping vm = StreamValueMapping<ToTuples::State>;
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vm(args,res,OPEN,local,s);
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while(vm(args,res,REQUEST,local,s)==YIELD){
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Tuple* tup = (Tuple*) res.addr;
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rel->AppendTuple(tup);
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tup->DeleteIfAllowed();
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}
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vm(args,res,CLOSE,local,s);
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result.setAddr(rel);
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return 0;
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}
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