LbmSegmentReaderBase.h

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/*
// $Id: //open/dev/fennel/lucidera/bitmap/LbmSegmentReaderBase.h#11 $
// Fennel is a library of data storage and processing components.
// Copyright (C) 2006-2009 LucidEra, Inc.
// Copyright (C) 2006-2009 The Eigenbase Project
//
// This program is free software; you can redistribute it and/or modify it
// under the terms of the GNU General Public License as published by the Free
// Software Foundation; either version 2 of the License, or (at your option)
// any later version approved by The Eigenbase Project.
//
// This program is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
// GNU General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
*/

#ifndef Fennel_LbmSegmentReaderBase_Included
#define Fennel_LbmSegmentReaderBase_Included

#include "fennel/tuple/TupleData.h"
#include "fennel/exec/ExecStreamDefs.h"
#include "fennel/lucidera/bitmap/LbmSegment.h"

#include <boost/dynamic_bitset.hpp>

FENNEL_BEGIN_NAMESPACE

class FENNEL_LBM_EXPORT LbmSegmentReaderBase
    : public LbmSegment
{
protected:
    SharedLbmTupleReader pTupleReader;

    uint byteSegLen;

    LbmByteNumber byteSegOffset;

    TupleData *pBitmapSegTuple;

    uint iSrid;
    uint iSegmentDesc;
    uint iSegments;

    uint zeroBytes;

    uint8_t singleton;

    bool tupleChange;

    void init(
        SharedExecStreamBufAccessor &pInAccessorInit,
        TupleData &bitmapSegTupleInit,
        bool setBitmapInit,
        boost::dynamic_bitset<> *pBitmapInit);

    void init(
        SharedExecStreamBufAccessor &pInAccessorInit,
        TupleData &bitmapSegTupleInit);

    void init(
        SharedLbmTupleReader &pTupleReaderInit,
        TupleData &bitmapSegTupleInit);

    void init(
        SharedLbmTupleReader &pTupleReaderInit,
        TupleData &bitmapSegTupleInit,
        bool setBitmapInit,
        boost::dynamic_bitset<> *pBitmapInit);

    ExecStreamResult readBitmapSegTuple();

    void advanceSegment();

private:
    bool setBitmap;

    boost::dynamic_bitset<> *pBitmap;

    LcsRid maxRidSet;

    void setBitsRead(LcsRid startRid, PBuffer segStart, uint segLen);

public:
    bool getTupleChange();

    void resetChangeListener();

    LcsRid getMaxRidSet();
};

FENNEL_END_NAMESPACE

#endif

// End LbmSegmentReaderBase.h

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