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/****************************************************************************
**
** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** 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 Technology Preview License Agreement accompanying
** this package.
**
** 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 1.1, included in the file LGPL_EXCEPTION.txt in this package.
**
** If you have questions regarding the use of this file, please contact
** Nokia at qt-info@nokia.com.
**
**
**
**
**
**
**
**
** $QT_END_LICENSE$
**
****************************************************************************/
//
// 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_OrderBy_H
#define Patternist_OrderBy_H
#include "qatomiccomparator_p.h"
#include "qcomparisonplatform_p.h"
#include "qsinglecontainer_p.h"
QT_BEGIN_HEADER
QT_BEGIN_NAMESPACE
namespace QPatternist
{
class ReturnOrderBy;
/**
* @short Performs the sorting by being a parent to ForClause.
*
* The child of the ForClause is a ReturnOrderBy expression, which collects
* the sort keys and values.
*
* @author Frans Englich <frans.englich@nokia.com>
* @ingroup Patternist_expressions
*/
class OrderBy : public SingleContainer
{
public:
enum Stability
{
StableOrder,
UnstableOrder
};
/**
* This class is value based.
*/
class OrderSpec : public ComparisonPlatform<OrderBy::OrderSpec,
true, /* Yes, issue errors. */
AtomicComparator::AsValueComparison>
{
public:
/**
* We want this guy to be public.
*/
using ComparisonPlatform<OrderBy::OrderSpec, true, AtomicComparator::AsValueComparison>::detailedFlexibleCompare;
typedef QVector<OrderSpec> Vector;
enum Direction
{
Ascending,
Descending
};
/**
* @short Default constructor, which is needed by QVector.
*/
inline OrderSpec()
{
}
inline OrderSpec(const Direction dir,
const StaticContext::OrderingEmptySequence orderingEmpty) : direction(dir),
orderingEmptySequence(orderingEmpty)
{
}
void prepare(const Expression::Ptr &source,
const StaticContext::Ptr &context);
const SourceLocationReflection *actualReflection() const
{
return m_expr.data();
}
private:
Expression::Ptr m_expr;
public:
/**
* We place these afterwards, such that m_expr gets aligned at the
* start of the address.
*/
Direction direction;
StaticContext::OrderingEmptySequence orderingEmptySequence;
inline AtomicComparator::Operator operatorID() const
{
return orderingEmptySequence == StaticContext::Least ? AtomicComparator::OperatorLessThanNaNLeast
: AtomicComparator::OperatorLessThanNaNGreatest;
}
};
OrderBy(const Stability stability,
const OrderSpec::Vector &orderSpecs,
const Expression::Ptr &operand,
ReturnOrderBy *const returnOrderBy);
virtual Item::Iterator::Ptr evaluateSequence(const DynamicContext::Ptr &context) const;
virtual SequenceType::Ptr staticType() const;
virtual Expression::Ptr typeCheck(const StaticContext::Ptr &context,
const SequenceType::Ptr &reqType);
virtual Expression::Ptr compress(const StaticContext::Ptr &context);
virtual SequenceType::List expectedOperandTypes() const;
virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const;
inline Item::Iterator::Ptr mapToSequence(const Item &i,
const DynamicContext::Ptr &context) const;
virtual Properties properties() const;
private:
/**
* Needed when calling makeSequenceMappingIterator().
*/
typedef QExplicitlySharedDataPointer<const OrderBy> ConstPtr;
const Stability m_stability;
OrderSpec::Vector m_orderSpecs;
ReturnOrderBy *const m_returnOrderBy;
};
/* TODO Q_DECLARE_TYPEINFO(OrderBy::OrderSpec, Q_MOVABLE_TYPE); Breaks,
* probably because it's nested. */
}
QT_END_NAMESPACE
QT_END_HEADER
#endif
|
