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39 | |
40 | // |
41 | // W A R N I N G |
42 | // ------------- |
43 | // |
44 | // This file is not part of the Qt API. It exists purely as an |
45 | // implementation detail. This header file may change from version to |
46 | // version without notice, or even be removed. |
47 | // |
48 | // We mean it. |
49 | |
50 | #ifndef Patternist_UntypedAtomicConverter_H |
51 | #define Patternist_UntypedAtomicConverter_H |
52 | |
53 | #include <private/qitem_p.h> |
54 | #include <private/qsinglecontainer_p.h> |
55 | #include <private/qcastingplatform_p.h> |
56 | |
57 | QT_BEGIN_NAMESPACE |
58 | |
59 | namespace QPatternist |
60 | { |
61 | /** |
62 | * @short Casts every item in a sequence obtained from |
63 | * evaluating an Expression, to a requested atomic type. |
64 | * |
65 | * The atomic values it casts from are instances of xs:untypedAtomic(hence |
66 | * the name). Typically, the items are from an Atomizer. UntypedAtomicConverter |
67 | * implements the automatic conversion which typically is activated when XPath |
68 | * is handling untyped data. |
69 | * |
70 | * @see <a href="http://www.w3.org/TR/xpath20/#id-function-calls">XML Path |
71 | * Language (XPath) 2.0, 3.1.5 Function Calls, in particular the |
72 | * Function Conversion Rules</a> |
73 | * @author Frans Englich <frans.englich@nokia.com> |
74 | * @ingroup Patternist_expressions |
75 | */ |
76 | class UntypedAtomicConverter : public SingleContainer, |
77 | public CastingPlatform<UntypedAtomicConverter, true> |
78 | { |
79 | public: |
80 | UntypedAtomicConverter(const Expression::Ptr &operand, |
81 | const ItemType::Ptr &reqType, |
82 | const ReportContext::ErrorCode code = ReportContext::FORG0001); |
83 | |
84 | virtual Item evaluateSingleton(const DynamicContext::Ptr &) const; |
85 | virtual Item::Iterator::Ptr evaluateSequence(const DynamicContext::Ptr &) const; |
86 | |
87 | virtual SequenceType::Ptr staticType() const; |
88 | virtual SequenceType::List expectedOperandTypes() const; |
89 | |
90 | virtual ExpressionVisitorResult::Ptr accept(const ExpressionVisitor::Ptr &visitor) const; |
91 | |
92 | /** |
93 | * Overridden to call CastingPlatform::typeCheck() |
94 | */ |
95 | virtual Expression::Ptr typeCheck(const StaticContext::Ptr &context, |
96 | const SequenceType::Ptr &reqType); |
97 | |
98 | inline Item mapToItem(const Item &item, |
99 | const DynamicContext::Ptr &context) const; |
100 | |
101 | inline ItemType::Ptr targetType() const |
102 | { |
103 | return m_reqType; |
104 | } |
105 | |
106 | virtual const SourceLocationReflection *actualReflection() const; |
107 | |
108 | private: |
109 | typedef QExplicitlySharedDataPointer<const UntypedAtomicConverter> ConstPtr; |
110 | const ItemType::Ptr m_reqType; |
111 | }; |
112 | |
113 | Item UntypedAtomicConverter::mapToItem(const Item &item, const DynamicContext::Ptr &context) const |
114 | { |
115 | return cast(sourceValue: item, context); |
116 | } |
117 | } |
118 | |
119 | QT_END_NAMESPACE |
120 | |
121 | #endif |
122 | |