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6 | ** This file is part of the QtXmlPatterns module of the Qt Toolkit. |
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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_InsertionIterator_H |
51 | #define Patternist_InsertionIterator_H |
52 | |
53 | #include <private/qabstractxmlforwarditerator_p.h> |
54 | #include <private/qitem_p.h> |
55 | |
56 | QT_BEGIN_NAMESPACE |
57 | |
58 | namespace QPatternist |
59 | { |
60 | /** |
61 | * @short Conceptually inserts one QAbstractXmlForwardIterator into another, make two QAbstractXmlForwardIterator instances appear as one. |
62 | * |
63 | * An InsertionIterator represents a sequence that is the merge of two |
64 | * sequences, where one of the iterators is conceptually inserted at a |
65 | * given position. This is done while retaining the characteristic of being |
66 | * pull-based. |
67 | * |
68 | * InsertionIterator contains the logic for the implementation of the <tt>fn:insert-before()</tt> |
69 | * function, whose definition therefore specifies the detailed behaviors of the |
70 | * InsertionIterator. |
71 | * |
72 | * @see <a href="http://www.w3.org/TR/xpath-functions/#func-insert-before">XQuery 1.0 |
73 | * and XPath 2.0 Functions and Operators, 15.1.7 fn:insert-before</a> |
74 | * @author Frans Englich <frans.englich@nokia.com> |
75 | * @ingroup Patternist_iterators |
76 | */ |
77 | class InsertionIterator : public Item::Iterator |
78 | { |
79 | public: |
80 | |
81 | /** |
82 | * Creates an InsertionIterator whose result is a merge of the |
83 | * iterator @p insertIterator into the iterator @p target at position @p |
84 | * position. |
85 | * |
86 | * @param target the iterator containing the items that the |
87 | * item in @p insertIterator will be inserted into. |
88 | * @param position the insertion position. Must be 1 or larger |
89 | * @param insertIterator the iterator containing the items to insert |
90 | * at position @p position |
91 | */ |
92 | InsertionIterator(const Item::Iterator::Ptr &target, |
93 | const xsInteger position, |
94 | const Item::Iterator::Ptr &insertIterator); |
95 | |
96 | virtual Item next(); |
97 | virtual Item current() const; |
98 | virtual xsInteger position() const; |
99 | virtual xsInteger count(); |
100 | virtual Item::Iterator::Ptr copy() const; |
101 | |
102 | private: |
103 | const Item::Iterator::Ptr m_target; |
104 | const xsInteger m_insertPos; |
105 | const Item::Iterator::Ptr m_inserts; |
106 | Item m_current; |
107 | xsInteger m_position; |
108 | bool m_isInserting; |
109 | }; |
110 | } |
111 | |
112 | QT_END_NAMESPACE |
113 | |
114 | #endif |
115 | |