source: trunk/src/xmlpatterns/api/qabstractxmlnodemodel.h@ 1036

/****************************************************************************
**
** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
** All rights reserved.
** Contact: Nokia Corporation ([email protected])
**
** This file is part of the QtXmlPatterns module of the Qt Toolkit.
**
** $QT_BEGIN_LICENSE:LGPL$
** Commercial Usage
** Licensees holding valid Qt Commercial licenses may use this file in
** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
** 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.
**
** 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 have questions regarding the use of this file, please contact
** Nokia at [email protected].
** $QT_END_LICENSE$
**
****************************************************************************/

#ifndef QABSTRACTXMLNODEMODEL_H
#define QABSTRACTXMLNODEMODEL_H

#include <QtXmlPatterns/QXmlName>
#include <QtCore/QSharedData>
#include <QtCore/QScopedPointer>

QT_BEGIN_HEADER
QT_BEGIN_NAMESPACE

QT_MODULE(XmlPatterns)

/* This file contains the classes QXmlNodeModelIndex, QAbstractXmlNodeModel,
 * QXmlItem and QPatternist::NodeIndexStorage. */

class QAbstractXmlNodeModel;
class QAbstractXmlNodeModelPrivate;
class QAbstractXmlReceiver;
class QSourceLocation;
class QUrl;
class QXmlName;
class QXmlNodeModelIndex;
template<typename T> class QAbstractXmlForwardIterator;
template<typename T> class QVector;

/* The members in the namespace QPatternist are internal, not part of the public API, and
 * unsupported. Using them leads to undefined behavior. */
namespace QPatternist
{
    class DynamicContext;
    class Item;
    class ItemType;
    class XsdValidatedXmlNodeModel;
    template<typename TResult, typename TSource, typename TMapper, typename Context> class ItemMappingIterator;
    template<typename TResult, typename TSource, typename TMapper> class SequenceMappingIterator;
    typedef QExplicitlySharedDataPointer<ItemType> ItemTypePtr;
    typedef QExplicitlySharedDataPointer<QAbstractXmlForwardIterator<Item> > ItemIteratorPtr;
    typedef QVector<QXmlName> QXmlNameVector;

    class NodeIndexStorage
    {
    public:
        typedef qint64 Data;

        /*!
          \note Changing merely the order of these two members, ptr and data,
                is a binary incompatible change on Mac Power PC.
         */
        union
        {
            void *ptr; // Do not use ptr directy, use pointer() instead.
            Data data;
        };
        void *pointer() const
        {
            /* Constructing to qptrdiff means we avoid the warning "cast to pointer
             * from integer of different size."
             */
            return (void *)qptrdiff(data);
        }

        Data additionalData;
        const QAbstractXmlNodeModel *model;

        /* Implementation is in qabstractxmlnodemodel.cpp. */
        inline bool operator!=(const NodeIndexStorage &other) const;
    };
}

class Q_XMLPATTERNS_EXPORT QXmlNodeModelIndex
{
    enum Constants
    {
        ForwardAxis         = 8192,
        ReverseAxis         = 16384
    };

public:
    inline QXmlNodeModelIndex()
    {
        reset();
    }

    inline QXmlNodeModelIndex(const QXmlNodeModelIndex &other) : m_storage(other.m_storage)
    {
    }

    bool operator==(const QXmlNodeModelIndex &other) const;
    bool operator!=(const QXmlNodeModelIndex &other) const;

    typedef QAbstractXmlForwardIterator<QXmlNodeModelIndex> Iterator;
    typedef QList<QXmlNodeModelIndex> List;

    enum NodeKind
    {
        Attribute               = 1,
        Comment                 = 2,
        Document                = 4,
        Element                 = 8,
        Namespace               = 16,
        ProcessingInstruction   = 32,
        Text                    = 64
    };

    enum DocumentOrder
    {
        Precedes = -1,
        Is       = 0,
        Follows  = 1
    };

    enum Axis
    {
        AxisChild               = 1 | ForwardAxis,
        AxisDescendant          = 2 | ForwardAxis,
        AxisAttribute           = 4 | ForwardAxis,
        AxisSelf                = 8 | ForwardAxis,
        AxisDescendantOrSelf    = 16 | ForwardAxis,
        AxisFollowingSibling    = 32 | ForwardAxis,
        AxisNamespace           = 64 | ForwardAxis,
        AxisFollowing           = 128 | ReverseAxis,
        AxisParent              = 256 | ReverseAxis,
        AxisAncestor            = 512 | ReverseAxis,
        AxisPrecedingSibling    = 1024 | ReverseAxis,
        AxisPreceding           = 2048 | ReverseAxis,
        AxisAncestorOrSelf      = 4096 | ReverseAxis,
        /* Note that we cannot clash with the values of ForwardAxis and
         * ReverseAxis. */
        AxisChildOrTop          = 32768 | ForwardAxis,
        AxisAttributeOrTop      = 65536 | ForwardAxis
    };

    inline qint64 data() const
    {
        return m_storage.data;
    }

    inline void *internalPointer() const
    {
        return m_storage.pointer();
    }

    inline const QAbstractXmlNodeModel *model() const
    {
        return m_storage.model;
    }

    inline qint64 additionalData() const
    {
        return m_storage.additionalData;
    }

    inline bool isNull() const
    {
        return !m_storage.model;
    }

    /* The members below are internal, not part of the public API, and
     * unsupported. Using them leads to undefined behavior. */

    inline QXmlName name() const;
    inline QXmlNodeModelIndex root() const;
    inline QExplicitlySharedDataPointer<QAbstractXmlForwardIterator<QXmlNodeModelIndex> > iterate(const Axis axis) const;
    inline QExplicitlySharedDataPointer<QAbstractXmlForwardIterator<QPatternist::Item> > sequencedTypedValue() const;
    inline QUrl documentUri() const;
    inline QUrl baseUri() const;
    inline NodeKind kind() const;
    inline bool isDeepEqual(const QXmlNodeModelIndex &other) const;
    inline DocumentOrder compareOrder(const QXmlNodeModelIndex &other) const;
    inline void sendNamespaces(QAbstractXmlReceiver *const receiver) const;
    inline QVector<QXmlName> namespaceBindings() const;
    inline QXmlName::NamespaceCode namespaceForPrefix(const QXmlName::PrefixCode prefix) const;
    inline QString stringValue() const;
    inline QPatternist::ItemTypePtr type() const;
    inline bool is(const QXmlNodeModelIndex &other) const;

    inline void reset()
    {
        m_storage.data = 0;
        m_storage.additionalData = 0;
        m_storage.model = 0;
    }

private:
    static inline QXmlNodeModelIndex create(const qint64 d,
                                            const QAbstractXmlNodeModel *const nm)
    {
        QXmlNodeModelIndex n;
        n.m_storage.data = d;
        n.m_storage.model = nm;
        n.m_storage.additionalData = 0;
        return n;
    }

    static inline QXmlNodeModelIndex create(const qint64 data,
                                            const QAbstractXmlNodeModel *const nm,
                                            const qint64 addData)
    {
        QXmlNodeModelIndex n;
        n.m_storage.data = data;
        n.m_storage.model = nm;
        n.m_storage.additionalData = addData;
        return n;
    }

    inline QXmlNodeModelIndex(const QPatternist::NodeIndexStorage &storage) : m_storage(storage)
    {
    }

    friend class QAbstractXmlNodeModel;
    friend class QPatternist::Item;
    friend class QXmlItem;
    inline operator int() const; // Disable

    QPatternist::NodeIndexStorage m_storage;
};

Q_XMLPATTERNS_EXPORT uint qHash(const QXmlNodeModelIndex &index);

inline bool qIsForwardIteratorEnd(const QXmlNodeModelIndex &item)
{
    return item.isNull();
}