StoredTypeDescriptor.h

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/*
// $Id: //open/dev/fennel/tuple/StoredTypeDescriptor.h#13 $
// 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_StoredTypeDescriptor_Included
#define Fennel_StoredTypeDescriptor_Included

FENNEL_BEGIN_NAMESPACE

class DataVisitor;

class FENNEL_TUPLE_EXPORT StoredTypeDescriptor
{
public:
    typedef uint Ordinal;

    virtual ~StoredTypeDescriptor();

    virtual Ordinal getOrdinal() const = 0;

    virtual uint getBitCount() const = 0;

    virtual uint getFixedByteCount() const = 0;

    virtual uint getMinByteCount(uint cbMaxWidth) const = 0;

    virtual uint getAlignmentByteCount(uint cbWidth) const = 0;

    virtual void visitValue(
        DataVisitor &dataVisitor,
        void const *pData,
        TupleStorageByteLength cbData) const = 0;

    virtual int compareValues(
        void const *pData1,
        TupleStorageByteLength cbData1,
        void const *pData2,
        TupleStorageByteLength cbData2) const = 0;
};

FENNEL_END_NAMESPACE

#endif

// End StoredTypeDescriptor.h

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