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