110 lines
3.0 KiB
C++
110 lines
3.0 KiB
C++
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/*
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----
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This file is part of SECONDO.
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Copyright (C) 2018, University in Hagen,
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Faculty of Mathematics and 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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1 Type Map Operator ~TType3~
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*/
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#include "TupleDescr.h"
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#include "NestedList.h"
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#include "Operator.h"
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#include "Stream.h"
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#include "ListUtils.h"
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#include "StandardTypes.h"
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#include "Algebras/Relation-C++/RelationAlgebra.h"
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using namespace std;
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namespace cstream{
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ListExpr TTYPE3TM(ListExpr args){
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if(!nl->HasMinLength(args,3)){
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return listutils::typeError("at least 3 arguments required");
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}
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ListExpr td = nl->Third(args);
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if(!nl->HasLength(td,2)){
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return listutils::typeError("internal error");
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}
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ListExpr tt = nl->First(td);
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if(!TupleDescr::checkType(tt)){
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return listutils::typeError("expected tuple description as third argument");
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}
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ListExpr expression = nl->Second(td);
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// we need some variables for feeding the ExecuteQuery function
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Word queryResult;
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string typeString = "";
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string errorString = "";
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bool correct;
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bool evaluable;
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bool defined;
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bool isFunction;
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// use the queryprocessor for executing the expression
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qp->ExecuteQuery(expression, queryResult,
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typeString, errorString, correct,
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evaluable, defined, isFunction);
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// check correctness of the expression
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if(!correct || !evaluable || !defined || isFunction){
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assert(queryResult.addr == 0);
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return listutils::typeError("could not extract evaluate the "
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"type description");
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}
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TupleDescr* fn = (TupleDescr*) queryResult.addr;
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assert(fn);
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if(!fn->IsDefined()){
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fn->DeleteIfAllowed();
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return listutils::typeError("filename undefined");
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}
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ListExpr attrList = fn->GetTupleTypeExpr();
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delete fn;
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ListExpr res = nl->TwoElemList(listutils::basicSymbol<Tuple>(),attrList);
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if(!Tuple::checkType(res)){
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cout << nl->ToString(res) << endl;
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return listutils::typeError("Tuple desscription represents "
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"not a valid tuple");
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}
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return res;
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}
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OperatorSpec TTYPE3Spec(
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"ANY x ANY x tupledecscr x ... -> Tuple(TUPLEDESCR)",
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" op(_) ",
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"Extracts the tuple type from a tupledescr thet is the third arg.",
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"Type Mapping operator"
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);
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Operator TTYPE3_Op(
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"TTYPE3",
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TTYPE3Spec.getStr(),
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0,
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Operator::SimpleSelect,
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TTYPE3TM
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);
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} // end of namespace
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