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 QXMLSERIALIZER_P_H
+#define QXMLSERIALIZER_P_H
+
+#include <QtCore/QIODevice>
+#include <QtCore/QStack>
+#include <QtCore/QTextCodec>
+#include <QtXmlPatterns/QXmlQuery>
+#include <QtXmlPatterns/QXmlNamePool>
+#include <QtXmlPatterns/QXmlSerializer>
+
+#include "qnamepool_p.h"
+#include "qabstractxmlreceiver_p.h"
+
+QT_BEGIN_HEADER
+
+QT_BEGIN_NAMESPACE
+
+class QXmlSerializerPrivate : public QAbstractXmlReceiverPrivate
+{
+public:
+    QXmlSerializerPrivate(const QXmlQuery &q,
+                          QIODevice *outputDevice);
+
+    QStack<QPair<QXmlName, bool> >      hasClosedElement;
+    bool                                isPreviousAtomic;
+    QXmlSerializer::State               state;
+    const QPatternist::NamePool::Ptr    np;
+
+    /**
+     * This member worries me a bit. We never use it but nevertheless
+     * it is pushed and pops linear to startElement() and endElement().
+     * An optimization would be to at least merge it with hasClosedElement,
+     * but even better to push it on demand. That is, namespaceBinding()
+     * pushes it up to the tree depth first when it is needed.
+     */
+    QStack<QVector<QXmlName> >          namespaces;
+
+    QIODevice *                         device;
+    const QTextCodec *                  codec;
+    QTextCodec::ConverterState          converterState;
+    /**
+     * Name cache. Since encoding QStrings are rather expensive
+     * operations to do, and we on top of that would have to do
+     * it each time a name appears, we here map names to their
+     * encoded equivalents.
+     *
+     * This means that when writing out large documents, the serialization
+     * of names after a while is reduced to a hash lookup and passing an
+     * existing byte array.
+     *
+     * We use QXmlName::Code as key as opposed to merely QName, because the
+     * prefix is of significance.
+     */
+    QHash<QXmlName::Code, QByteArray>   nameCache;
+    const QXmlQuery                     query;
+
+    inline void write(const char c);
+
+private:
+    enum Constants
+    {
+        EstimatedTreeDepth = 10,
+
+        /**
+         * We use a high count to avoid rehashing. We can afford it since we
+         * only allocate one hash for this.
+         */
+        EstimatedNameCount = 60
+    };
+};
+
+void QXmlSerializerPrivate::write(const char c)
+{
+    device->putChar(c);
+}
+QT_END_NAMESPACE
+QT_END_HEADER
+
+#endif