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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_IfThenClause_H
53 #define Patternist_IfThenClause_H
55 #include <private/qtriplecontainer_p.h>
64 * @short Implements XPath 2.0's conditional expression <tt>if([expr]) then [expr] else [expr]</tt>.
66 * @see <a href="http://www.w3.org/TR/xpath20/#id-conditionals">XML Path Language (XPath) 2.0,
67 * 3.8 Conditional Expressions</a>
68 * @author Frans Englich <frans.englich@nokia.com>
69 * @ingroup Patternist_expressions
71 class IfThenClause : public TripleContainer
74 IfThenClause(const Expression::Ptr &test,
75 const Expression::Ptr &then,
76 const Expression::Ptr &el);
78 virtual bool evaluateEBV(const DynamicContext::Ptr &context) const;
79 virtual Item::Iterator::Ptr evaluateSequence(const DynamicContext::Ptr &context) const;
80 virtual Item evaluateSingleton(const DynamicContext::Ptr &context) const;
81 virtual void evaluateToSequenceReceiver(const DynamicContext::Ptr &context) const;
83 virtual SequenceType::List expectedOperandTypes() const;
84 virtual Expression::Ptr compress(const StaticContext::Ptr &context);
86 virtual SequenceType::Ptr staticType() const;
87 virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const;
89 * @returns IDIfThenClause
91 virtual ID id() const;
92 virtual QList<QExplicitlySharedDataPointer<OptimizationPass> > optimizationPasses() const;
93 //virtual Properties properties() const;