--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/xmlpatterns/iterators/qcachingiterator_p.h	Mon Jan 11 14:00:40 2010 +0000
@@ -0,0 +1,129 @@
+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (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 Technology Preview License Agreement accompanying
+** this package.
+**
+** 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 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@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_CachingIterator_H
+#define Patternist_CachingIterator_H
+
+#include <QList>
+#include <QVector>
+
+#include "qdynamiccontext_p.h"
+#include "qitem_p.h"
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+namespace QPatternist
+{
+    /**
+     * @short An QAbstractXmlForwardIterator that gets its item from a cache unless its empty, in
+     * which case it continues to populate the cache as well as deliver on its
+     * own from a source QAbstractXmlForwardIterator.
+     *
+     * @author Frans Englich <frans.frans.englich@nokia.com>
+     * @ingroup Patternist_iterators
+     */
+    class CachingIterator : public Item::Iterator
+    {
+    public:
+        /**
+         * We always use the same cache cell so why don't we use it directly,
+         * instead of passing the slot and ItemSequenceCacheCell::Vector to
+         * this class? Because the GenericDynamicContext might decide to resize
+         * the vector and that would invalidate the reference.
+         *
+         * We intentionally pass in a non-const reference here.
+         */
+        CachingIterator(ItemSequenceCacheCell::Vector &cacheCells,
+                        const VariableSlotID slot,
+                        const DynamicContext::Ptr &context);
+
+        virtual Item next();
+        virtual Item current() const;
+        virtual xsInteger position() const;
+        virtual Item::Iterator::Ptr copy() const;
+
+    private:
+        Item                        m_current;
+        xsInteger                   m_position;
+
+        /**
+         * This variable cannot be called m_slot, because
+         * /usr/include/sys/sysmacros.h on hpuxi-acc defines it.
+         */
+        const VariableSlotID        m_varSlot;
+
+        /**
+         * We don't use the context. We only keep a reference such that it
+         * doesn't get deleted, and m_cacheCells starts to dangle.
+         */
+        const DynamicContext::Ptr   m_context;
+
+        /**
+         * We intentionally store a reference here such that we are able to
+         * modify the item.
+         */
+        ItemSequenceCacheCell::Vector &m_cacheCells;
+
+        /**
+         * Whether this CachingIterator is delivering items from
+         * m_cacheCell.cacheItems or from m_cacheCell.sourceIterator.
+         */
+        bool m_usingCache;
+    };
+}
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif