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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
57QT_BEGIN_NAMESPACE
58
59namespace 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
119QT_END_NAMESPACE
120
121#endif
122

source code of qtxmlpatterns/src/xmlpatterns/janitors/quntypedatomicconverter_p.h