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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_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 <fenglich@trolltech.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