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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_Aggregator_H |
51 | #define Patternist_Aggregator_H |
52 | |
53 | #include <private/qfunctioncall_p.h> |
54 | |
55 | QT_BEGIN_NAMESPACE |
56 | |
57 | namespace QPatternist |
58 | { |
59 | |
60 | /** |
61 | * @short Carries a staticType() implementation appropriate |
62 | * for functions which returns a singleton value derived from its first argument. |
63 | * |
64 | * One example of such a function is FloorFN, implementing <tt>fn:floor()</tt>, |
65 | * which returns a single value of the same type as the first argument, or the empty |
66 | * sequence if the first argument evaluates to the empty sequence. |
67 | * |
68 | * Aggregator is abstract, and exists for saving code. It is inherited |
69 | * by classes which needs the staticType() implementation this class provides. |
70 | * |
71 | * @see Piper |
72 | * @ingroup Patternist_functions |
73 | * @author Frans Englich <frans.englich@nokia.com> |
74 | */ |
75 | class Aggregator : public FunctionCall |
76 | { |
77 | public: |
78 | /** |
79 | * @returns a static type where the ItemType is the same as this FunctionCall's first |
80 | * argument, and the Cardinality is as return from Cardinality::toWithoutMany(). |
81 | */ |
82 | virtual SequenceType::Ptr staticType() const; |
83 | }; |
84 | } |
85 | |
86 | QT_END_NAMESPACE |
87 | |
88 | #endif |
89 | |