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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_EmptySequenceType_H
53 #define Patternist_EmptySequenceType_H
55 #include <private/qatomictype_p.h>
56 #include <private/qsequencetype_p.h>
66 * @short Represents the <tt>empty-sequence()</tt> type.
68 * @ingroup Patternist_types
69 * @author Frans Englich <frans.englich@nokia.com>
71 class EmptySequenceType : public ItemType,
75 typedef QExplicitlySharedDataPointer<EmptySequenceType> Ptr;
78 * Possibly surprisingly, this function also returns true for the @c none type.
80 * @returns @c true if @p other is NoneType or EmptySequenceType, otherwise @c false.
82 virtual bool xdtTypeMatches(const ItemType::Ptr &other) const;
85 * @returns always @c false
87 virtual bool itemMatches(const Item &item) const;
90 * @returns always "empty-sequence()"
92 virtual QString displayName(const NamePool::Ptr &np) const;
94 virtual ItemType::Ptr xdtSuperType() const;
96 virtual bool isNodeType() const;
97 virtual bool isAtomicType() const;
100 * @return always Cardinality::empty()
102 virtual Cardinality cardinality() const;
105 * @returns always 'this' since it is also an ItemType
107 virtual ItemType::Ptr itemType() const;
110 * @returns always @c xs:anyAtomicType
112 virtual ItemType::Ptr atomizedType() const;
115 friend class CommonSequenceTypes;