/****************************************************************************
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** This file is part of the QtXmlPatterns module of the Qt Toolkit.
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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_CombineNodes_H
#define Patternist_CombineNodes_H
#include "qpaircontainer_p.h"
QT_BEGIN_HEADER
QT_BEGIN_NAMESPACE
namespace QPatternist
{
/**
* @short Implements XPath 2.0's operators for combining node sequences: @c union,
* @c intersect and @c except.
*
* @see XQuery 1.0: An XML Query
* Language, 3.3.3 Combining QXmlNodeModelIndex Sequences
* @author Frans Englich
* @ingroup Patternist_expressions
*/
class Q_AUTOTEST_EXPORT CombineNodes : public PairContainer
{
public:
enum Operator
{
Union = 1,
Intersect = 2,
Except = 4
};
CombineNodes(const Expression::Ptr &operand1,
const Operator op,
const Expression::Ptr &operand2);
virtual Item::Iterator::Ptr evaluateSequence(const DynamicContext::Ptr &context) const;
virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const;
virtual bool evaluateEBV(const DynamicContext::Ptr &context) const;
virtual SequenceType::Ptr staticType() const;
virtual SequenceType::List expectedOperandTypes() const;
virtual Expression::Ptr typeCheck(const StaticContext::Ptr &context,
const SequenceType::Ptr &reqType);
Operator operatorID() const;
virtual ID id() const;
/**
* Determines the string representation for operator @p op.
*
* @return "union" if @p op is Union, "intersect" if @p op
* is Intersect and "except" if @p op is Except.
*/
static QString displayName(const Operator op);
virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const;
private:
const Operator m_operator;
};
}
QT_END_NAMESPACE
QT_END_HEADER
#endif