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** rights. These rights are described in the Nokia Qt LGPL Exception | |
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** GNU General Public License Usage | |
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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_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 |