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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://www.qtsoftware.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_SortTuple_H
#define Patternist_SortTuple_H
#include "qitem_p.h"
#include "qitem_p.h"
#include "qitemtype_p.h"
QT_BEGIN_HEADER
QT_BEGIN_NAMESPACE
namespace QPatternist
{
/**
* @short Represents a value and its sort keys
* in FLOWR's <tt>order by</tt> clause.
*
* SortTuple doesn't correspond to anything in the XPath Data Model and
* can therefore well be described as an exotic implementation detail.
* Most of its functions asserts because it makes no sense to
* call them.
*
* SortTuple exclusively exists for use with the expressions OrderBy and
* ReturnOrderBy, and acts as a carrier between those two for sort keys and
* source values.
*
* @ingroup Patternist_xdm
* @author Frans Englich <fenglich@trolltech.com>
*/
class SortTuple : public AtomicValue
{
public:
/**
* @p aSortKeys may be empty.
*/
inline SortTuple(const Item::Iterator::Ptr &aValue,
const Item::Vector &aSortKeys) : m_sortKeys(aSortKeys),
m_value(aValue)
{
Q_ASSERT(m_value);
Q_ASSERT(!m_sortKeys.isEmpty());
}
/**
* A smart pointer wrapping SortTuple instances.
*/
typedef QExplicitlySharedDataPointer<SortTuple> Ptr;
/**
* This function is sometimes called by Literal::description().
* This function simply returns "SortTuple".
*/
virtual QString stringValue() const;
/**
* @short Always asserts.
*/
virtual Item::Iterator::Ptr typedValue() const;
/**
* @short Always asserts.
*/
virtual bool isAtomicValue() const;
/**
* @short Always asserts.
*/
virtual bool isNode() const;
/**
* @short Always asserts.
*/
virtual bool hasError() const;
virtual ItemType::Ptr type() const;
inline const Item::Vector &sortKeys() const
{
return m_sortKeys;
}
inline const Item::Iterator::Ptr &value() const
{
return m_value;
}
private:
const Item::Vector m_sortKeys;
const Item::Iterator::Ptr m_value;
};
}
QT_END_NAMESPACE
QT_END_HEADER
#endif
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