src/xmlpatterns/data/qatomiccaster_p.h

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  41
  42 //
  43 //  W A R N I N G
  44 //  -------------
  45 //
  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.
  49 //
  50 // We mean it.
  51
  52 #ifndef Patternist_AtomicCaster_H
  53 #define Patternist_AtomicCaster_H
  54
  55 #include "qdynamiccontext_p.h"
  56 #include "qitem_p.h"
  57 #include "qatomictypedispatch_p.h"
  58
  59 QT_BEGIN_HEADER
  60
  61 QT_BEGIN_NAMESPACE
  62
  63 namespace QPatternist
  64 {
  65     /**
  66      * @short AtomicCaster is an abstract base class for classes
  67      * that performs casting between two atomic values of specific types.
  68      *
  69      * @ingroup Patternist_xdm
  70      * @author Frans Englich <frans.englich@nokia.com>
  71      */
  72     class AtomicCaster : public AtomicTypeVisitorResult
  73     {
  74     public:
  75         typedef QExplicitlySharedDataPointer<AtomicCaster> Ptr;
  76         AtomicCaster();
  77         virtual ~AtomicCaster();
  78
  79         /**
  80          * Casts @p from to an atomic value of the type this class
  81          * casts to, and returns that value. The @p context is used
  82          * for reporting errors in case the casting fails, and to in general
  83          * access information from the dynamic context.
  84          */
  85         virtual Item castFrom(const Item &from,
  86                               const QExplicitlySharedDataPointer<DynamicContext> &context) const = 0;
  87     };
  88 }
  89
  90 QT_END_NAMESPACE
  91
  92 QT_END_HEADER
  93
  94 #endif