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/****************************************************************************
**
** Copyright (C) 2021 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtXmlPatterns module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:COMM$
**
** 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 The Qt Company. For licensing terms
** and conditions see https://www.qt.io/terms-conditions. For further
** information use the contact form at https://www.qt.io/contact-us.
**
** $QT_END_LICENSE$
**
**
**
**
**
**
**
**
**
**
**
**
**
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**
**
****************************************************************************/
//
// 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_RemovalIterator_H
#define Patternist_RemovalIterator_H
#include <private/qitem_p.h>
QT_BEGIN_NAMESPACE
namespace QPatternist
{
/**
* @short Removes one items at a specified position from an input QAbstractXmlForwardIterator.
*
* RemoveIterator removes an item from a sequence at a certain position,
* while retaining the pull-based characteristic of being an QAbstractXmlForwardIterator itself. The
* RemovalIterator's constructor is passed an QAbstractXmlForwardIterator, the QAbstractXmlForwardIterator to
* remove from, and the position of the item to remove. When calling the RemovalIterator's
* functions, it acts as an ordinary QAbstractXmlForwardIterator, taking into account that
* one item is removed from the source QAbstractXmlForwardIterator.
*
* The RemovalIterator class contains the central business logic for implementing the
* <tt>fn:remove()</tt> function, whose definition therefore specifies the detailed behaviors
* of RemovalIterator.
*
* @see <a href="http://www.w3.org/TR/xpath-functions/#func-remove">XQuery 1.0
* and XPath 2.0 Functions and Operators, 15.1.8 fn:remove</a>
* @author Frans Englich <frans.englich@nokia.com>
* @ingroup Patternist_iterators
*/
class RemovalIterator : public Item::Iterator
{
public:
/**
* Creates an RemovalIterator.
*
* @param target the QAbstractXmlForwardIterator containing the sequence of items
* which the item at position @p position should be removed from.
* @param position the position of the item to remove. Must be
* 1 or larger.
*/
RemovalIterator(const Item::Iterator::Ptr &target,
const xsInteger position);
virtual Item next();
virtual Item current() const;
virtual xsInteger position() const;
/**
* The QAbstractXmlForwardIterator's count is computed by subtracting one from the source
* QAbstractXmlForwardIterator's count.
*/
virtual xsInteger count();
virtual Item::Iterator::Ptr copy() const;
private:
const Item::Iterator::Ptr m_target;
const xsInteger m_removalPos;
Item m_current;
xsInteger m_position;
};
}
QT_END_NAMESPACE
#endif
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