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/****************************************************************************
**
** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of the QtAddOn.JsonDb module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial License Usage
** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Digia. For licensing terms and
** conditions see http://qt.digia.com/licensing. For further information
** use the contact form at http://qt.digia.com/contact-us.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 2.1 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 2.1 requirements
** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
**
** In addition, as a special exception, Digia gives you certain additional
** rights. These rights are described in the Digia Qt LGPL Exception
** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 3.0 as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL included in the
** packaging of this file. Please review the following information to
** ensure the GNU General Public License version 3.0 requirements will be
** met: http://www.gnu.org/copyleft/gpl.html.
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
#ifndef HBTREECURSOR_H
#define HBTREECURSOR_H
#include <QByteArray>
#include <QStack>
class HBtree;
class HBtreeTransaction;
class HBtreeCursor
{
public:
enum RangePolicy
{
EqualOrGreater,
EqualOrLess
};
HBtreeCursor();
explicit HBtreeCursor(HBtreeTransaction * transaction);
explicit HBtreeCursor(HBtree *btree, bool commited = false);
~HBtreeCursor();
QByteArray key() const { return key_; }
QByteArray value() const { return value_; }
bool current(QByteArray *pKey, QByteArray *pValue);
bool last();
bool first();
bool next();
bool previous();
bool seek(const QByteArray &key);
bool seekRange(const QByteArray &key, RangePolicy policy = EqualOrGreater);
HBtreeCursor(const HBtreeCursor &other);
HBtreeCursor &operator = (const HBtreeCursor &other);
private:
enum Op {
First,
Last,
Previous,
Next,
ExactMatch,
FuzzyMatch
};
friend class HBtree;
friend class HBtreePrivate;
QByteArray key_;
QByteArray value_;
HBtreeTransaction *transaction_;
HBtree *btree_;
quint32 lastLeaf_;
bool valid_;
bool doOp(Op op, const QByteArray &key = QByteArray());
};
#endif // HBTREECURSOR_H
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