/****************************************************************************+
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**+
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** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).+
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** All rights reserved.+
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** Contact: Nokia Corporation (qt-info@nokia.com)+
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**+
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** This file is part of the QtXmlPatterns module of the Qt Toolkit.+
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**+
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** $QT_BEGIN_LICENSE:LGPL$+
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** No Commercial Usage+
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** This file contains pre-release code and may not be distributed.+
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** You may use this file in accordance with the terms and conditions+
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** contained in the Technology Preview License Agreement accompanying+
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** this package.+
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**+
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** GNU Lesser General Public License Usage+
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** Alternatively, this file may be used under the terms of the GNU Lesser+
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** General Public License version 2.1 as published by the Free Software+
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** Foundation and appearing in the file LICENSE.LGPL included in the+
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** packaging of this file.  Please review the following information to+
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** ensure the GNU Lesser General Public License version 2.1 requirements+
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** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.+
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**+
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** In addition, as a special exception, Nokia gives you certain additional+
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** rights.  These rights are described in the Nokia Qt LGPL Exception+
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** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.+
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**+
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** If you have questions regarding the use of this file, please contact+
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** Nokia at qt-info@nokia.com.+
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**+
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**+
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**+
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**+
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**+
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**+
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**+
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**+
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** $QT_END_LICENSE$+
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**+
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****************************************************************************/+
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+
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//+
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//  W A R N I N G+
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//  -------------+
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//+
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// This file is not part of the Qt API.  It exists purely as an+
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// implementation detail.  This header file may change from version to+
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// version without notice, or even be removed.+
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//+
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// We mean it.+
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+
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#ifndef Patternist_EmptyIterator_H+
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#define Patternist_EmptyIterator_H+
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+
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#include "qabstractxmlforwarditerator_p.h"+
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#include "qprimitives_p.h"+
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+
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QT_BEGIN_HEADER+
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+
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QT_BEGIN_NAMESPACE+
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+
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namespace QPatternist+
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{+
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+
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    /**+
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     * @short An QAbstractXmlForwardIterator which always is empty.+
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     *+
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     * EmptyIterator is an QAbstractXmlForwardIterator over the type @c T, which always is empty. Other+
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     * iterators can also be empty(or, at least behave as they are empty), but this+
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     * class is special designed for this purpose and is therefore fast.+
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     *+
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     * EmptyIterator's constructor is protected, instances is retrieved from CommonValues.+
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     *+
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     * @author Frans Englich <frans.englich@nokia.com>+
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     * @ingroup Patternist_iterators+
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     */+
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    template<typename T> class EmptyIterator : public QAbstractXmlForwardIterator<T>+
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    {+
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    public:+
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        /**+
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         * @returns always a default constructed value, T().+
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         */+
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        virtual T next()+
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        {+
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            return T();+
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        }+
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+
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        /**+
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         * @returns always a default constructed value, T().+
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         */+
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        virtual T current() const+
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        {+
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            return T();+
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        }+
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+
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        /**+
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         * @returns always 0.+
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         */+
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        virtual xsInteger position() const+
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        {+
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            return 0;+
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        }+
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+
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        /**+
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         * @returns always @c this, the reverse of <tt>()</tt> is <tt>()</tt>.+
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         */+
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        virtual typename QAbstractXmlForwardIterator<T>::Ptr toReversed()+
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        {+
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            return typename QAbstractXmlForwardIterator<T>::Ptr(const_cast<EmptyIterator<T> *>(this));+
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        }+
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+
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        /**+
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         * @returns always 0+
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         */+
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        virtual xsInteger count()+
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        {+
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            return 0;+
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        }+
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+
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        /**+
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         * @returns @c this+
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         */+
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        virtual typename QAbstractXmlForwardIterator<T>::Ptr copy() const+
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        {+
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            return typename QAbstractXmlForwardIterator<T>::Ptr(const_cast<EmptyIterator *>(this));+
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        }+
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+
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    protected:+
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        friend class CommonValues;+
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    };+
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+
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    template<typename T>+
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    static inline+
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    typename QAbstractXmlForwardIterator<T>::Ptr+
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    makeEmptyIterator()+
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    {+
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        return typename QAbstractXmlForwardIterator<T>::Ptr(new EmptyIterator<T>());+
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    }+
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+
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}+
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+
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QT_END_NAMESPACE+
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+
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QT_END_HEADER+
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+
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#endif+
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