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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 <private/qpaircontainer_p.h> |
| |
| QT_BEGIN_NAMESPACE |
| |
| namespace QPatternist |
| { |
| /** |
| * @short Implements XPath 2.0's operators for combining node sequences: @c union, |
| * @c intersect and @c except. |
| * |
| * @see <a href="http://www.w3.org/TR/xquery/#combining_seq">XQuery 1.0: An XML Query |
| * Language, 3.3.3 Combining QXmlNodeModelIndex Sequences</a> |
| * @author Frans Englich <frans.englich@nokia.com> |
| * @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 |
| |
| #endif |