BTreeNonLeafReader.h

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/*
// $Id: //open/dev/fennel/btree/BTreeNonLeafReader.h#6 $
// Fennel is a library of data storage and processing components.
// Copyright (C) 2005-2009 The Eigenbase Project
// Copyright (C) 2005-2009 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_BTreeNonLeafReader_Included
#define Fennel_BTreeNonLeafReader_Included

#include "fennel/btree/BTreeReader.h"

FENNEL_BEGIN_NAMESPACE

class FENNEL_BTREE_EXPORT BTreeNonLeafReader
    : public BTreeReader
{
    bool adjustRootLockMode(LockMode &lockMode);

    virtual bool searchExtreme(bool first);

public:
    explicit BTreeNonLeafReader(BTreeDescriptor const &descriptor);

    TupleAccessor const &getTupleAccessorForRead() const;

    virtual bool searchForKey(
        TupleData const &key,
        DuplicateSeek dupSeek,
        bool leastUpper = true);

    virtual bool searchNext();

    bool isRootOnly();

    bool isPositionedOnInfinityKey();

    BTreeNodeAccessor &getNonLeafNodeAccessor();

    PageId getChildForCurrent();

};

FENNEL_END_NAMESPACE

#endif

// End BTreeNonLeafReader.h

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