128 lines
3.1 KiB
C++
128 lines
3.1 KiB
C++
/*
|
|
----
|
|
This file is part of SECONDO.
|
|
|
|
Copyright (C) 2018, University in Hagen,
|
|
Faculty of Mathematics and Computer Science,
|
|
Database Systems for New Applications.
|
|
|
|
SECONDO is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2 of the License, or
|
|
(at your option) any later version.
|
|
|
|
SECONDO is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with SECONDO; if not, write to the Free Software
|
|
Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
----
|
|
|
|
|
|
1 Operator ~printstream~
|
|
|
|
This operator prints out the vtuples within a stream.
|
|
|
|
*/
|
|
|
|
|
|
#include "VTuple.h"
|
|
#include "NestedList.h"
|
|
#include "Operator.h"
|
|
#include "Stream.h"
|
|
#include "ListUtils.h"
|
|
#include "StandardTypes.h"
|
|
#include "Algebras/Relation-C++/RelationAlgebra.h"
|
|
|
|
namespace cstream{
|
|
|
|
ListExpr printstreamTM(ListExpr args){
|
|
if(!nl->HasLength(args,1)){
|
|
return listutils::typeError("One element expected");
|
|
}
|
|
std::string err = "stream(vtuple) expected";
|
|
ListExpr a1 = nl->First(args);
|
|
if(!nl->HasLength(a1,2)){
|
|
return listutils::typeError(err);
|
|
}
|
|
if(!listutils::isSymbol(nl->First(a1), Stream<VTuple>::BasicType())){
|
|
return listutils::typeError(err);
|
|
}
|
|
ListExpr vt = nl->Second(a1);
|
|
if(!nl->HasLength(vt,1)){
|
|
return listutils::typeError(err);
|
|
}
|
|
if(!VTuple::CheckType(nl->First(vt))){
|
|
return listutils::typeError(err);
|
|
}
|
|
return nl->First(args);
|
|
}
|
|
|
|
int printstreamVM(Word* args, Word& result, int message,
|
|
Word& local, Supplier s) {
|
|
|
|
Stream<VTuple>* stream = (Stream<VTuple>*) local.addr;
|
|
|
|
|
|
switch(message){
|
|
case OPEN:
|
|
if(stream){
|
|
stream->close();
|
|
delete stream;
|
|
}
|
|
stream = new Stream<VTuple>(args[0]);
|
|
stream->open();
|
|
local.addr = stream;
|
|
return 0;
|
|
case REQUEST:{
|
|
if(!stream) return CANCEL;
|
|
VTuple* tup = stream->request();
|
|
result.addr = tup;
|
|
if(tup){
|
|
cout << "received VTUPLE: " << endl;
|
|
//tup->getTupleDescr()->Print(cout) << endl;
|
|
//cout << "-------------------- " << endl;
|
|
tup->getTuple()->Print(cout) << endl;
|
|
cout << "==================== " << endl << endl;
|
|
}
|
|
return result.addr?YIELD:CANCEL;
|
|
}
|
|
case CLOSE:
|
|
if(stream){
|
|
stream->close();
|
|
delete stream;
|
|
local.addr = 0;
|
|
}
|
|
return 0;
|
|
}
|
|
return -1;
|
|
|
|
}
|
|
|
|
|
|
OperatorSpec printstreamSpec(
|
|
"stream(vtuple) -> stream(vtuple)",
|
|
"_ printstream",
|
|
"prints out the v-tuples in a stream.",
|
|
"query receivestream('ais.txt',\"ais\") printstream count"
|
|
);
|
|
|
|
Operator printstream_Op(
|
|
"printstream",
|
|
printstreamSpec.getStr(),
|
|
printstreamVM,
|
|
Operator::SimpleSelect,
|
|
printstreamTM
|
|
);
|
|
|
|
|
|
|
|
|
|
|
|
} // end of namespace
|
|
|
|
|