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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_RemovalIterator_H
53 #define Patternist_RemovalIterator_H
55 #include <private/qitem_p.h>
65 * @short Removes one items at a specified position from an input QAbstractXmlForwardIterator.
67 * RemoveIterator removes an item from a sequence at a certain position,
68 * while retaining the pull-based characteristic of being an QAbstractXmlForwardIterator itself. The
69 * RemovalIterator's constructor is passed an QAbstractXmlForwardIterator, the QAbstractXmlForwardIterator to
70 * remove from, and the position of the item to remove. When calling the RemovalIterator's
71 * functions, it acts as an ordinary QAbstractXmlForwardIterator, taking into account that
72 * one item is removed from the source QAbstractXmlForwardIterator.
74 * The RemovalIterator class contains the central business logic for implementing the
75 * <tt>fn:remove()</tt> function, whose definition therefore specifies the detailed behaviors
78 * @see <a href="http://www.w3.org/TR/xpath-functions/#func-remove">XQuery 1.0
79 * and XPath 2.0 Functions and Operators, 15.1.8 fn:remove</a>
80 * @author Frans Englich <frans.englich@nokia.com>
81 * @ingroup Patternist_iterators
83 class RemovalIterator : public Item::Iterator
88 * Creates an RemovalIterator.
90 * @param target the QAbstractXmlForwardIterator containing the sequence of items
91 * which the item at position @p position should be removed from.
92 * @param position the position of the item to remove. Must be
95 RemovalIterator(const Item::Iterator::Ptr &target,
96 const xsInteger position);
99 virtual Item current() const;
100 virtual xsInteger position() const;
103 * The QAbstractXmlForwardIterator's count is computed by subtracting one from the source
104 * QAbstractXmlForwardIterator's count.
106 virtual xsInteger count();
108 virtual Item::Iterator::Ptr copy() const;
111 const Item::Iterator::Ptr m_target;
112 const xsInteger m_removalPos;
114 xsInteger m_position;