92 lines
2.3 KiB
C++
92 lines
2.3 KiB
C++
/*
|
|
|
|
1.1 ~OperatorDBIARG~
|
|
|
|
This operator retrieves the type of the x-th argument in the argumentlist.
|
|
If this argument represents a valid Secondo type, just this type is
|
|
returned. Otherwise the type is requested from the DBService. To do so,
|
|
also the symbol of the first argument, i.e. the relation, is used.
|
|
|
|
|
|
----
|
|
This file is part of SECONDO.
|
|
|
|
Copyright (C) 2017,
|
|
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
|
|
----
|
|
|
|
*/
|
|
#ifndef ALGEBRAS_DBSERVICE_OperatorDBIARG_HPP_
|
|
#define ALGEBRAS_DBSERVICE_OperatorDBIARG_HPP_
|
|
|
|
#include "Operator.h"
|
|
#include "Algebras/DBService/OperatorCommon.hpp"
|
|
#include "StringUtils.h"
|
|
|
|
namespace DBService {
|
|
|
|
/*
|
|
|
|
1.1.1 Operator Specification
|
|
|
|
*/
|
|
template<int X>
|
|
struct DBIARGInfo: OperatorInfo
|
|
{
|
|
DBIARGInfo()
|
|
{
|
|
std::string x = stringutils::int2str(X);
|
|
name = "DBIARG" + x;
|
|
signature = "(rel(tuple(X)))) x t_2 x ... x t_"
|
|
+ x +" ... x t_n -> t_"+x;
|
|
syntax = "DBIARG"+x+"(_,_,...)";
|
|
meaning = "determine the type of the argument at position "+x+
|
|
" by either retrieving "
|
|
"it from the local type or from the DBService";
|
|
example = "only for usage in operator signature";
|
|
remark = "requires a DBService system";
|
|
usesArgsInTypeMapping = true;
|
|
}
|
|
};
|
|
|
|
/*
|
|
|
|
1.1.1 Class Definition
|
|
|
|
*/
|
|
|
|
template<int X>
|
|
class OperatorDBIARG
|
|
{
|
|
public:
|
|
|
|
/*
|
|
|
|
1.1.1.1 Type Mapping Function
|
|
|
|
*/
|
|
static ListExpr mapType(ListExpr args) {
|
|
bool locallyAvailable;
|
|
return OperatorCommon::getDerivedType(args, X, locallyAvailable);
|
|
}
|
|
};
|
|
|
|
} /* namespace DBService */
|
|
|
|
#endif /* ALGEBRAS_DBSERVICE_OPERATORDBIARG_HPP */
|