92 lines
2.0 KiB
C++
92 lines
2.0 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 <exception>
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#include "LogMsg.h"
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namespace CRelAlgebra
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{
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namespace Operators
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{
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template<class T>
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T *DefaultCreate(ArgVector args, Supplier s)
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{
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return new T(args, s);
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}
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template<class T, T *(*create)(ArgVector, Supplier) = DefaultCreate<T>>
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int StreamValueMapping(ArgVector args, Word &result, int message,
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Word &local, Supplier s)
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{
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try
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{
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switch (message)
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{
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case OPEN:
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{
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if (local.addr != nullptr)
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{
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delete (T*)local.addr;
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}
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local.addr = create(args, s);
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break;
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}
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case REQUEST:
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{
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if ((result.addr = ((T*)local.addr)->Request()) == nullptr)
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{
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return CANCEL;
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}
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return YIELD;
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}
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case CLOSE:
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{
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if (local.addr != nullptr)
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{
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delete (T*)local.addr;
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local.addr = nullptr;
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}
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break;
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}
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}
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return 0;
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}
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catch (const std::exception &e)
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{
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ErrorReporter::ReportError(e.what());
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}
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return FAILURE;
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};
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}
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} |