Long live Qt 4.5!

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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_DelegatingDynamicContext_H
+#define Patternist_DelegatingDynamicContext_H
+
+#include "qdynamiccontext_p.h"
+#include "qexpression_p.h"
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+namespace QPatternist
+{
+    /**
+     * @short Base class for dynamic contexts that are
+     * created from an existing one.
+     *
+     * In some cases multiple DynamicContext instances must be used in
+     * order to maintain somekind of scope. This class delegates
+     * the DynamicContext interface onto another DynamicContext instance,
+     * allowing the sub-class to only implement what it needs to.
+     *
+     * @author Frans Englich <fenglich@trolltech.com>
+     */
+    class DelegatingDynamicContext : public DynamicContext
+    {
+    public:
+        virtual xsInteger contextPosition() const;
+        virtual Item contextItem() const;
+        virtual xsInteger contextSize();
+
+        virtual ItemCacheCell &itemCacheCell(const VariableSlotID slot);
+        virtual ItemSequenceCacheCell::Vector &itemSequenceCacheCells(const VariableSlotID slot);
+
+        virtual void setRangeVariable(const VariableSlotID slotNumber,
+                                      const Item &newValue);
+        virtual Item rangeVariable(const VariableSlotID slotNumber) const;
+
+        virtual void setExpressionVariable(const VariableSlotID slotNumber,
+                                           const Expression::Ptr &newValue);
+        virtual Expression::Ptr expressionVariable(const VariableSlotID slotNumber) const;
+
+        virtual void setFocusIterator(const Item::Iterator::Ptr &it);
+        virtual Item::Iterator::Ptr focusIterator() const;
+
+        virtual Item::Iterator::Ptr positionIterator(const VariableSlotID slot) const;
+        virtual void setPositionIterator(const VariableSlotID slot,
+                                         const Item::Iterator::Ptr &newValue);
+
+        virtual QAbstractMessageHandler * messageHandler() const;
+        virtual QExplicitlySharedDataPointer<DayTimeDuration> implicitTimezone() const;
+        virtual QDateTime currentDateTime() const;
+        virtual QAbstractXmlReceiver *outputReceiver() const;
+        virtual NodeBuilder::Ptr nodeBuilder(const QUrl &baseURI) const;
+        virtual ResourceLoader::Ptr resourceLoader() const;
+        virtual ExternalVariableLoader::Ptr externalVariableLoader() const;
+        virtual NamePool::Ptr namePool() const;
+        virtual QSourceLocation locationFor(const SourceLocationReflection *const reflection) const;
+        virtual void addNodeModel(const QAbstractXmlNodeModel::Ptr &nm);
+        virtual const QAbstractUriResolver *uriResolver() const;
+        virtual ItemCacheCell &globalItemCacheCell(const VariableSlotID slot);
+        virtual ItemSequenceCacheCell::Vector &globalItemSequenceCacheCells(const VariableSlotID slot);
+        virtual Item currentItem() const;
+        virtual TemplateParameterHash &templateParameterStore();
+
+        virtual DynamicContext::Ptr previousContext() const;
+        virtual QExplicitlySharedDataPointer<TemplateMode> currentTemplateMode() const;
+
+    protected:
+        DelegatingDynamicContext(const DynamicContext::Ptr &prevContext);
+
+        const DynamicContext::Ptr m_prevContext;
+    };
+}
+
+QT_END_NAMESPACE
+
+QT_END_HEADER
+
+#endif