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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_CardinalityVerifier_H
53 #define Patternist_CardinalityVerifier_H
55 #include <private/qsinglecontainer_p.h>
65 * @short Verifies that the sequence an Expression evaluates to conforms to a Cardinality.
67 * @see <a href="http://www.w3.org/TR/xpath-functions/#cardinality-funcs">XQuery 1.0 and
68 * XPath 2.0 Functions and Operators, 15.2 Functions That Test the Cardinality of Sequences</a>
69 * @author Frans Englich <frans.englich@nokia.com>
70 * @ingroup Patternist_expressions
72 class CardinalityVerifier : public SingleContainer
75 CardinalityVerifier(const Expression::Ptr &operand,
76 const Cardinality &card,
77 const ReportContext::ErrorCode code);
79 virtual Item::Iterator::Ptr evaluateSequence(const DynamicContext::Ptr &context) const;
80 virtual Item evaluateSingleton(const DynamicContext::Ptr &) const;
82 virtual SequenceType::List expectedOperandTypes() const;
83 virtual SequenceType::Ptr staticType() const;
85 virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const;
88 * If the static cardinality of the operand is within the required cardinality,
89 * the operand is returned as is, since results will always be valid and hence
90 * is not a CardinalityVerifier necessary.
92 virtual Expression::Ptr compress(const StaticContext::Ptr &context);
95 * A utility function for determining whether the static type of an Expression matches
96 * a cardinality. More specifically, this function performs the cardinality verification
97 * part of the Function Conversion Rules.
99 * @todo Mention the rewrite and when exactly an error is issued via @p context
101 static Expression::Ptr
102 verifyCardinality(const Expression::Ptr &operand,
103 const Cardinality &card,
104 const StaticContext::Ptr &context,
105 const ReportContext::ErrorCode code = ReportContext::XPTY0004);
107 virtual const SourceLocationReflection *actualReflection() const;
112 * Centralizes a message string in order to increase consistency and
113 * reduce work for translators.
115 static inline QString wrongCardinality(const Cardinality &req,
116 const Cardinality &got = Cardinality::empty());
118 const Cardinality m_reqCard;
119 const bool m_allowsMany;
120 const ReportContext::ErrorCode m_errorCode;