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/****************************************************************************
**
** Copyright (C) 2016 The Qt Company Ltd.
** Contact: https://www.qt.io/licensing/
**
** This file is part of the QtXmlPatterns module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** 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 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.
**
** GNU Lesser General Public License Usage
** Alternatively, this file may be used under the terms of the GNU Lesser
** General Public License version 3 as published by the Free Software
** Foundation and appearing in the file LICENSE.LGPL3 included in the
** packaging of this file. Please review the following information to
** ensure the GNU Lesser General Public License version 3 requirements
** will be met: https://www.gnu.org/licenses/lgpl-3.0.html.
**
** GNU General Public License Usage
** Alternatively, this file may be used under the terms of the GNU
** General Public License version 2.0 or (at your option) the GNU General
** Public license version 3 or any later version approved by the KDE Free
** Qt Foundation. The licenses are as published by the Free Software
** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3
** included in the packaging of this file. Please review the following
** information to ensure the GNU General Public License requirements will
** be met: https://www.gnu.org/licenses/gpl-2.0.html and
** https://www.gnu.org/licenses/gpl-3.0.html.
**
** $QT_END_LICENSE$
**
****************************************************************************/
//
// 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 <private/qitem_p.h>
#include <private/qitem_p.h>
#include <private/qitemtype_p.h>
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 <frans.englich@nokia.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".
*/
QString stringValue() const override;
/**
* @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.
*/
bool hasError() const override;
ItemType::Ptr type() const override;
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
#endif
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