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filetree.h Example File
xmlpatterns/filetree/filetree.h

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 #include <QtCore/QFileInfo>
 #include <QtCore/QDir>
 #include <QtCore/QVector>
 #include <QtXmlPatterns/QSimpleXmlNodeModel>

 class FileTree : public QSimpleXmlNodeModel
 {
 public:
     FileTree(const QXmlNamePool &namePool);

     QXmlNodeModelIndex nodeFor(const QString &fileName) const;

     /* Reimplement pure functions in QAbstractXmlNodeModel. */
     virtual QXmlNodeModelIndex::DocumentOrder compareOrder(const QXmlNodeModelIndex&,
                                                            const QXmlNodeModelIndex&) const;
     virtual QXmlName name(const QXmlNodeModelIndex &node) const;
     virtual QUrl documentUri(const QXmlNodeModelIndex &node) const;
     virtual QXmlNodeModelIndex::NodeKind kind(const QXmlNodeModelIndex &node) const;
     virtual QXmlNodeModelIndex root(const QXmlNodeModelIndex &node) const;
     virtual QVariant typedValue(const QXmlNodeModelIndex &node) const;
     virtual QVector<QXmlNodeModelIndex> attributes(const QXmlNodeModelIndex &element) const;
 protected:
     virtual QXmlNodeModelIndex nextFromSimpleAxis(SimpleAxis, const QXmlNodeModelIndex&) const;

 private:
     enum Type {
         File,
         Directory,
         AttributeFileName,
         AttributeFilePath,
         AttributeSize,
         AttributeMIMEType,
         AttributeSuffix
     };

     inline QXmlNodeModelIndex nextSibling(const QXmlNodeModelIndex &nodeIndex,
                                           const QFileInfo &from,
                                           qint8 offset) const;
     inline const QFileInfo &toFileInfo(const QXmlNodeModelIndex &index) const;
     inline QXmlNodeModelIndex toNodeIndex(const QFileInfo &index,
                                           Type attributeName) const;
     /**
      * Same as above, but derives the type from the QFileInfo.
      */
     inline QXmlNodeModelIndex toNodeIndex(const QFileInfo &index) const;

     /*
      One possible improvement is to use a hash, and use the &*&value()
      trick to get a pointer, which would be stored in data() instead
      of the index.
     */
     mutable QVector<QFileInfo>  m_fileInfos;
     QVector<QXmlName>           m_names;
     const QDir::Filters         m_filterAllowAll;
     const QDir::SortFlags       m_sortFlags;
 };