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authorLars Knoll <lars.knoll@nokia.com>2009-03-23 09:18:55 (GMT)
committerSimon Hausmann <simon.hausmann@nokia.com>2009-03-23 09:18:55 (GMT)
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treec2afbf6f1066b6ce261f14341cf6d310e5595bc1 /src/xmlpatterns/iterators/qremovaliterator_p.h
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Long live Qt 4.5!
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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the QtXmlPatterns module of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file. Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+//
+// W A R N I N G
+// -------------
+//
+// This file is not part of the Qt API. It exists purely as an
+// implementation detail. This header file may change from version to
+// version without notice, or even be removed.
+//
+// We mean it.
+
+#ifndef Patternist_RemovalIterator_H
+#define Patternist_RemovalIterator_H
+
+#include "qitem_p.h"
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+namespace QPatternist
+{
+
+ /**
+ * @short Removes one items at a specified position from an input QAbstractXmlForwardIterator.
+ *
+ * RemoveIterator removes an item from a sequence at a certain position,
+ * while retaining the pull-based characteristic of being an QAbstractXmlForwardIterator itself. The
+ * RemovalIterator's constructor is passed an QAbstractXmlForwardIterator, the QAbstractXmlForwardIterator to
+ * remove from, and the position of the item to remove. When calling the RemovalIterator's
+ * functions, it acts as an ordinary QAbstractXmlForwardIterator, taking into account that
+ * one item is removed from the source QAbstractXmlForwardIterator.
+ *
+ * The RemovalIterator class contains the central business logic for implementing the
+ * <tt>fn:remove()</tt> function, whose definition therefore specifies the detailed behaviors
+ * of RemovalIterator.
+ *
+ * @see <a href="http://www.w3.org/TR/xpath-functions/#func-remove">XQuery 1.0
+ * and XPath 2.0 Functions and Operators, 15.1.8 fn:remove</a>
+ * @author Frans Englich <fenglich@trolltech.com>
+ * @ingroup Patternist_iterators
+ */
+ class RemovalIterator : public Item::Iterator
+ {
+ public:
+
+ /**
+ * Creates an RemovalIterator.
+ *
+ * @param target the QAbstractXmlForwardIterator containing the sequence of items
+ * which the item at position @p position should be removed from.
+ * @param position the position of the item to remove. Must be
+ * 1 or larger.
+ */
+ RemovalIterator(const Item::Iterator::Ptr &target,
+ const xsInteger position);
+
+ virtual Item next();
+ virtual Item current() const;
+ virtual xsInteger position() const;
+
+ /**
+ * The QAbstractXmlForwardIterator's count is computed by subtracting one from the source
+ * QAbstractXmlForwardIterator's count.
+ */
+ virtual xsInteger count();
+
+ virtual Item::Iterator::Ptr copy() const;
+
+ private:
+ const Item::Iterator::Ptr m_target;
+ const xsInteger m_removalPos;
+ Item m_current;
+ xsInteger m_position;
+ };
+}
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif