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/****************************************************************************
**
** Copyright (C) 2010 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_Focus_H
#define Patternist_Focus_H
#include "qdelegatingdynamiccontext_p.h"
QT_BEGIN_HEADER
QT_BEGIN_NAMESPACE
namespace QPatternist
{
/**
* @short A DynamicContext that maintains the focus, a sequence
* of items.
*
* Focus implements both the outer and inner focus. The focus is one of
* the things that characterizes the XPath language. The focus is what's
* iterated over in a predicate, whose current item can be received
* via the context item expression, <tt>.</tt>(the dot),
* and whose size is retrievable via the function <tt>fn:last()</tt>.
*
* @author Frans Englich <frans.englich@nokia.com>
*/
class Focus : public DelegatingDynamicContext
{
public:
Focus(const DynamicContext::Ptr &prevContext);
virtual xsInteger contextPosition() const;
virtual Item contextItem() const;
virtual xsInteger contextSize();
virtual void setFocusIterator(const Item::Iterator::Ptr &it);
virtual Item::Iterator::Ptr focusIterator() const;
/**
* If there is no top level expression that sets the current item,
* the focus should be used. This implementation ensures that.
*/
virtual Item currentItem() const;
private:
Item::Iterator::Ptr m_focusIterator;
xsInteger m_contextSizeCached;
};
}
QT_END_NAMESPACE
QT_END_HEADER
#endif
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