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46 // This file is not part of the Qt API. It exists purely as an
47 // implementation detail. This header file may change from version to
48 // version without notice, or even be removed.
52 #ifndef Patternist_CombineNodes_H
53 #define Patternist_CombineNodes_H
55 #include <private/qpaircontainer_p.h>
64 * @short Implements XPath 2.0's operators for combining node sequences: @c union,
65 * @c intersect and @c except.
67 * @see <a href="http://www.w3.org/TR/xquery/#combining_seq">XQuery 1.0: An XML Query
68 * Language, 3.3.3 Combining QXmlNodeModelIndex Sequences</a>
69 * @author Frans Englich <frans.englich@nokia.com>
70 * @ingroup Patternist_expressions
72 class Q_AUTOTEST_EXPORT CombineNodes : public PairContainer
82 CombineNodes(const Expression::Ptr &operand1,
84 const Expression::Ptr &operand2);
86 virtual Item::Iterator::Ptr evaluateSequence(const DynamicContext::Ptr &context) const;
87 virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const;
88 virtual bool evaluateEBV(const DynamicContext::Ptr &context) const;
89 virtual SequenceType::Ptr staticType() const;
90 virtual SequenceType::List expectedOperandTypes() const;
91 virtual Expression::Ptr typeCheck(const StaticContext::Ptr &context,
92 const SequenceType::Ptr &reqType);
94 Operator operatorID() const;
95 virtual ID id() const;
98 * Determines the string representation for operator @p op.
100 * @return "union" if @p op is Union, "intersect" if @p op
101 * is Intersect and "except" if @p op is Except.
103 static QString displayName(const Operator op);
105 virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const;
108 const Operator m_operator;