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/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtXmlPatterns module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** No Commercial Usage
** This file contains pre-release code and may not be distributed.
** You may use this file in accordance with the terms and conditions
** contained in the either Technology Preview License Agreement or the
** Beta Release License Agreement.
**
** 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, Nokia gives you certain
** additional rights. These rights are described in the Nokia Qt LGPL
** Exception version 1.0, 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.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at http://qt.nokia.com/contact.
** $QT_END_LICENSE$
**
****************************************************************************/
//
// W A R N I N G
// -------------
//
// This file is not part of the Qt API. It exists purely as an
// implementation detail. This header file may change from version to
// version without notice, or even be removed.
//
// We mean it.
#ifndef Patternist_InsertionIterator_H
#define Patternist_InsertionIterator_H
#include "qabstractxmlforwarditerator_p.h"
#include "qitem_p.h"
QT_BEGIN_HEADER
QT_BEGIN_NAMESPACE
namespace QPatternist
{
/**
* @short Conceptually inserts one QAbstractXmlForwardIterator into another, make two QAbstractXmlForwardIterator instances appear as one.
*
* An InsertionIterator represents a sequence that is the merge of two
* sequences, where one of the iterators is conceptually inserted at a
* given position. This is done while retaining the characteristic of being
* pull-based.
*
* InsertionIterator contains the logic for the implementation of the <tt>fn:insert-before()</tt>
* function, whose definition therefore specifies the detailed behaviors of the
* InsertionIterator.
*
* @see <a href="http://www.w3.org/TR/xpath-functions/#func-insert-before">XQuery 1.0
* and XPath 2.0 Functions and Operators, 15.1.7 fn:insert-before</a>
* @author Frans Englich <frans.englich@nokia.com>
* @ingroup Patternist_iterators
*/
class InsertionIterator : public Item::Iterator
{
public:
/**
* Creates an InsertionIterator whose result is a merge of the
* iterator @p insertIterator into the iterator @p target at position @p
* position.
*
* @param target the iterator containing the items that the
* item in @p insertIterator will be inserted into.
* @param position the insertion position. Must be 1 or larger
* @param insertIterator the iterator containing the items to insert
* at position @p position
*/
InsertionIterator(const Item::Iterator::Ptr &target,
const xsInteger position,
const Item::Iterator::Ptr &insertIterator);
virtual Item next();
virtual Item current() const;
virtual xsInteger position() const;
virtual xsInteger count();
virtual Item::Iterator::Ptr copy() const;
private:
const Item::Iterator::Ptr m_target;
const xsInteger m_insertPos;
const Item::Iterator::Ptr m_inserts;
Item m_current;
xsInteger m_position;
bool m_isInserting;
};
}
QT_END_NAMESPACE
QT_END_HEADER
#endif
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