93 lines
2.2 KiB
C++
93 lines
2.2 KiB
C++
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/*
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This file is part of SECONDO.
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Copyright (C) 2013, 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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TileAlgebra includes
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*/
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#include "CELLS.h"
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/*
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declaration of namespace TileAlgebra
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*/
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namespace TileAlgebra
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{
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/*
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Method CELLSTypeMappingFunction returns the return value type
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of CELLS operator in the form of a ListExpr.
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author: Dirk Zacher
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parameters: arguments - arguments of CELLS operator
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return value: return value type of CELLS operator
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exceptions: -
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*/
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ListExpr CELLSTypeMappingFunction(ListExpr arguments)
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{
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ListExpr type = NList::typeError("Operator CELLS expects "
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"a t type or a mt type.");
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NList argumentsList(arguments);
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if(argumentsList.length() >= 1)
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{
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std::string argument1 = argumentsList.first().str();
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std::string valueWrapperType;
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if(IstType(argument1) ||
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IsmtType(argument1))
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{
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valueWrapperType = GetValueWrapperType(argument1);
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}
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if(valueWrapperType.empty() == false)
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{
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type = NList(NList("rel"),
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NList(NList("tuple"),
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NList(NList("Elem"),
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NList(valueWrapperType)).enclose()
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)
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).listExpr();
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}
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else
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{
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type = NList::typeError("Operator CELLS cannot determine value type of " +
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argument1 + ".");
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}
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}
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else
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{
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type = NList::typeError("Operator CELLS expects at least one argument.");
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}
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return type;
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}
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}
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