--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/xmlpatterns/iterators/qsingletoniterator_p.h	Mon Jan 11 14:00:40 2010 +0000
@@ -0,0 +1,177 @@
+/****************************************************************************
+**
+** 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_SingletonIterator_H
+#define Patternist_SingletonIterator_H
+
+#include <QtXmlPatterns/private/qabstractxmlforwarditerator_p.h>
+
+#include <QtXmlPatterns/private/qprimitives_p.h>
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+namespace QPatternist
+{
+    /**
+     * @short An QAbstractXmlForwardIterator over exactly one item.
+     *
+     * SingletonIterator's constructor takes one value which is
+     * the item it forms an QAbstractXmlForwardIterator over. Other QAbstractXmlForwardIterator instances can
+     * also form an QAbstractXmlForwardIterator with one in length, but by that SingletonIterator
+     * has this as it only task, it means it is efficient at it.
+     *
+     * Having to represent single items in Iterators is relatively common.
+     *
+     * @author Frans Englich <frans.englich@nokia.com>
+     * @ingroup Patternist_iterators
+     */
+    template<typename T>
+    class SingletonIterator : public QAbstractXmlForwardIterator<T>
+    {
+    public:
+        /**
+         * Creates an iterator over @p item.
+         *
+         * @note item may not be @c null. Use the EmptyIterator for
+         * the empty sequence
+         */
+        SingletonIterator(const T &item) : m_item(item),
+                                           m_position(0)
+        {
+            Q_ASSERT(!qIsForwardIteratorEnd(item));
+        }
+
+        virtual T next()
+        {
+            switch(m_position)
+            {
+                case 0:
+                {
+                    ++m_position;
+                    return m_item;
+                }
+                case 1:
+                {
+                    m_position = -1;
+                    return T();
+                }
+                default:
+                {
+                    Q_ASSERT(m_position == -1);
+                    return T();
+                }
+            }
+        }
+
+        virtual T current() const
+        {
+            if(m_position == 1)
+                return m_item;
+            else
+                return T();
+        }
+
+        virtual xsInteger position() const
+        {
+            return m_position;
+        }
+
+        /**
+         * @returns a copy of this instance, rewinded to the beginning.
+         */
+        virtual typename QAbstractXmlForwardIterator<T>::Ptr toReversed()
+        {
+            return typename QAbstractXmlForwardIterator<T>::Ptr(new SingletonIterator<T>(m_item));
+        }
+
+        /**
+         * @returns always 1
+         */
+        virtual xsInteger count()
+        {
+            return 1;
+        }
+
+        virtual typename QAbstractXmlForwardIterator<T>::Ptr copy() const
+        {
+            return typename QAbstractXmlForwardIterator<T>::Ptr(new SingletonIterator(m_item));
+        }
+
+    private:
+        const T m_item;
+        qint8 m_position;
+    };
+
+    /**
+     * @short An object generator for SingletonIterator.
+     *
+     * makeSingletonIterator() is a convenience function for avoiding specifying
+     * the full template instantiation for SingletonIterator. Conceptually, it
+     * is identical to Qt's qMakePair().
+     *
+     * @relates SingletonIterator
+     */
+    template<typename T>
+    inline
+    typename SingletonIterator<T>::Ptr
+    makeSingletonIterator(const T &item)
+    {
+        return typename SingletonIterator<T>::Ptr(new SingletonIterator<T>(item));
+    }
+}
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif