106 lines
2.4 KiB
C++
106 lines
2.4 KiB
C++
/*
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----
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This file is part of SECONDO.
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Copyright (C) 2004-2009, University in Hagen, Faculty of Mathematics
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and Computer Science, 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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#pragma once
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#include "AlgebraTypes.h"
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#include <cstddef>
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#include "Algebras/CRel/Ints.h"
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#include "NestedList.h"
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#include "Operator.h"
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#include "SecondoSMI.h"
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#include "Stream.h"
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#include "Algebras/CRel/TBlock.h"
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#include "Algebras/CRel/TypeConstructors/TBlockTC.h"
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#include <vector>
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/*
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1 ExtendProjectOperator.h
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we are going to use the CRelAlgebra namespace here as we are mostly operating
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with types of this algebra and this operator is also logically closer to
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the CRel algebra than the ColumnMoving algebra
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*/
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namespace CRelAlgebra
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{
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namespace Operators
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{
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/*
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1.1 Declaration of the cextendproject Operator for CRel
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*/
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class ExtendProjectOperator : public Operator
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{
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public:
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ExtendProjectOperator();
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private:
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/*
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The value mapping will be done by the function ~StreamValueMapping~ of the
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CRel algebra. This function expects a template parameter, which represents
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the status of an open stream.
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*/
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class State
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{
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public:
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State(ArgVector args, const TBlockTI &blockType);
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~State();
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TBlock *Request();
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private:
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/*
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represents the open stream
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*/
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Stream<TBlock> m_stream;
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const SharedArray<uint64_t> m_projectionIndices;
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/*
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the second entry of the parameter array of the value mapping call
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and contains the pointers to the mapping functions for the new columns
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*/
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Supplier m_extendParameter;
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/*
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The types of the extension columns
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*/
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ListExpr m_extensionTypes;
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};
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static const OperatorInfo info;
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static ListExpr TypeMapping(ListExpr args);
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static State *CreateState(ArgVector args, Supplier s);
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};
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}
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}
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