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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_UnionIterator_H
51#define Patternist_UnionIterator_H
52
53#include <private/qitem_p.h>
54
55QT_BEGIN_NAMESPACE
56
57namespace QPatternist
58{
59 /**
60 * @short Implements the @c except operator. That is, the computation
61 * of the sequence of nodes from one sequence, that doesn't appear in the
62 * other.
63 *
64 * @ingroup Patternist_iterators
65 */
66 class UnionIterator : public Item::Iterator
67 {
68 public:
69 /**
70 * It is assumed that @p it1 and @p it2 are in document order and
71 * without duplicates.
72 */
73 UnionIterator(const Item::Iterator::Ptr &it1,
74 const Item::Iterator::Ptr &it2);
75
76 virtual Item next();
77 virtual Item current() const;
78 virtual xsInteger position() const;
79 virtual Item::Iterator::Ptr copy() const;
80
81 private:
82 inline Item nextFromFirstOperand()
83 {
84 ++m_position;
85 m_current = m_node1;
86 m_node1 = m_it1->next();
87 return m_current;
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/qunioniterator_p.h