TupleData.h

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/*
// $Id: //open/dev/fennel/tuple/TupleData.h#24 $
// Fennel is a library of data storage and processing components.
// Copyright (C) 2005-2009 The Eigenbase Project
// Copyright (C) 2003-2009 SQLstream, Inc.
// Copyright (C) 2005-2009 LucidEra, Inc.
// Portions Copyright (C) 1999-2009 John V. Sichi
//
// 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_TupleData_Included
#define Fennel_TupleData_Included

#include "fennel/tuple/StandardTypeDescriptor.h"
#include "fennel/tuple/TupleDescriptor.h"

#include <vector>


FENNEL_BEGIN_NAMESPACE


class TupleDescriptor;
class TupleProjection;

struct FENNEL_TUPLE_EXPORT TupleDatum
{
    TupleStorageByteLength cbData;
    PConstBuffer pData;

    union
    {
        uint16_t data16;
        uint32_t data32;
        uint64_t data64;
    };

    inline explicit TupleDatum();
    inline TupleDatum(TupleDatum const &other);

    /*
     * Test if this TupleDatum represents NULL value.
     *
     * @return true if this TupleDatum represents NULL.
     */
    inline bool isNull() const;

    inline void setNull();

    inline TupleDatum &operator = (TupleDatum const &other);

    inline void copyFrom(TupleDatum const &other);

    void memCopyFrom(TupleDatum const &other);
};

class FENNEL_TUPLE_EXPORT TupleData
    : public std::vector<TupleDatum>
{
public:
    inline explicit TupleData();
    inline explicit TupleData(TupleDescriptor const &tupleDesc);

    void compute(TupleDescriptor const &);

    bool containsNull() const;

    bool containsNull(TupleProjection const &tupleProj) const;

    void projectFrom(TupleData const& src, TupleProjection const&);
};

/****************************************************
  Definitions of inline methods for class TupleDatum
 ****************************************************/

inline TupleDatum::TupleDatum()
{
    cbData = 0;
    pData = NULL;
}

inline TupleDatum::TupleDatum(TupleDatum const &other)
{
    copyFrom(other);
}

inline bool TupleDatum::isNull() const
{
    return (!pData);
}

inline void TupleDatum::setNull()
{
    pData = NULL;
}

inline TupleDatum &TupleDatum::operator = (TupleDatum const &other)
{
    copyFrom(other);
    return *this;
}

inline void TupleDatum::copyFrom(TupleDatum const &other)
{
    cbData = other.cbData;
    pData = other.pData;
}

/***************************************************
  Definitions of inline methods for class TupleData
 ***************************************************/

inline TupleData::TupleData()
{
}

inline TupleData::TupleData(TupleDescriptor const &tupleDesc)
{
    compute(tupleDesc);
}

FENNEL_END_NAMESPACE

#endif

// End TupleData.h

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