SingleOutputExecStream.h

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00001 /*
00002 // $Id: //open/dev/fennel/exec/SingleOutputExecStream.h#10 $
00003 // Fennel is a library of data storage and processing components.
00004 // Copyright (C) 2005-2009 The Eigenbase Project
00005 // Copyright (C) 2005-2009 SQLstream, Inc.
00006 // Copyright (C) 2005-2009 LucidEra, Inc.
00007 // Portions Copyright (C) 2004-2009 John V. Sichi
00008 //
00009 // This program is free software; you can redistribute it and/or modify it
00010 // under the terms of the GNU General Public License as published by the Free
00011 // Software Foundation; either version 2 of the License, or (at your option)
00012 // any later version approved by The Eigenbase Project.
00013 //
00014 // This program is distributed in the hope that it will be useful,
00015 // but WITHOUT ANY WARRANTY; without even the implied warranty of
00016 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
00017 // GNU General Public License for more details.
00018 //
00019 // You should have received a copy of the GNU General Public License
00020 // along with this program; if not, write to the Free Software
00021 // Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
00022 */
00023 
00024 #ifndef Fennel_SingleOutputExecStream_Included
00025 #define Fennel_SingleOutputExecStream_Included
00026 
00027 #include "fennel/exec/ExecStream.h"
00028 
00029 FENNEL_BEGIN_NAMESPACE
00030 
00034 struct FENNEL_EXEC_EXPORT SingleOutputExecStreamParams
00035     : virtual public ExecStreamParams
00036 {
00037     TupleDescriptor outputTupleDesc;
00038 
00039     TupleFormat outputTupleFormat;
00040 
00041     explicit SingleOutputExecStreamParams();
00042 };
00043 
00052 class FENNEL_EXEC_EXPORT SingleOutputExecStream
00053     : virtual public ExecStream
00054 {
00055 protected:
00056     SharedExecStreamBufAccessor pOutAccessor;
00057 
00058 public:
00059     // implement ExecStream
00060     virtual void setInputBufAccessors(
00061         std::vector<SharedExecStreamBufAccessor> const &inAccessors);
00062     virtual void setOutputBufAccessors(
00063         std::vector<SharedExecStreamBufAccessor> const &outAccessors);
00064     virtual void prepare(SingleOutputExecStreamParams const &params);
00065     virtual void open(bool restart);
00066     virtual ExecStreamBufProvision getOutputBufProvision() const;
00067 };
00068 
00069 FENNEL_END_NAMESPACE
00070 
00071 #endif
00072 
00073 // End SingleOutputExecStream.h

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