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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_IntersectIterator_H
51#define Patternist_IntersectIterator_H
52
53#include <private/qitem_p.h>
54
55QT_BEGIN_NAMESPACE
56
57namespace QPatternist
58{
59 /**
60 * @short Implements the @c intersect operator. That is, the computation
61 * of the intersection between two sequences of nodes.
62 *
63 * The @c intersect operator can be seen as logical @c AND of the two sets.
64 *
65 * @ingroup Patternist_iterators
66 */
67 class IntersectIterator : public Item::Iterator
68 {
69 public:
70 /**
71 * It is assumed that @p it1 and @p it2 are in document order and
72 * without duplicates.
73 */
74 IntersectIterator(const Item::Iterator::Ptr &it1,
75 const Item::Iterator::Ptr &it2);
76
77 virtual Item next();
78 virtual Item current() const;
79 virtual xsInteger position() const;
80 virtual Item::Iterator::Ptr copy() const;
81
82 private:
83 inline Item closedExit()
84 {
85 m_position = -1;
86 m_current = Item();
87 return Item();
88 }
89
90 const Item::Iterator::Ptr m_it1;
91 const Item::Iterator::Ptr m_it2;
92 Item m_current;
93 xsInteger m_position;
94 Item m_node1;
95 Item m_node2;
96 };
97}
98
99QT_END_NAMESPACE
100
101#endif
102

source code of qtxmlpatterns/src/xmlpatterns/iterators/qintersectiterator_p.h