/****************************************************************************
**
** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtXmlPatterns module of the Qt Toolkit.
**
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** No Commercial Usage
** This file contains pre-release code and may not be distributed.
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** contained in the Technology Preview License Agreement accompanying
** this package.
**
** 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
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** $QT_END_LICENSE$
**
****************************************************************************/

//
//  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_NamespaceBinding_H
#define Patternist_NamespaceBinding_H

template<typename T> class QVector;

#include "qxmlname.h"

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

namespace QPatternist
{
    /**
     * @short Represents a namespace binding: a prefix, and a namespace URI.
     *
     * @author Frans Englich <frans.englich@nokia.com>
     */
    class NamespaceBinding
    {
    public:
        enum
        {
            InvalidCode = -1
        };

        typedef QVector<NamespaceBinding> Vector;

        inline NamespaceBinding() : m_prefix(InvalidCode),
                                    m_namespace(InvalidCode)
        {
        }

        inline NamespaceBinding(const QXmlName::PrefixCode p,
                                const QXmlName::NamespaceCode n) : m_prefix(p),
                                                                m_namespace(n)
        {
        }

        inline bool operator==(const NamespaceBinding &other) const
        {
            return m_prefix == other.m_prefix &&
                   m_namespace == other.m_namespace;
        }

        inline QXmlName::PrefixCode prefix() const
        {
            return m_prefix;
        }

        inline QXmlName::NamespaceCode namespaceURI() const
        {
            return m_namespace;
        }

        inline bool isNull() const
        {
            return m_prefix == InvalidCode;
        }

        /**
         * @short Constructs a NamespaceBinding whose prefix and namespace is
         * taken from @p qName.
         *
         * The local name in @p qName is ignored. @p qName may not be null.
         */
        static inline NamespaceBinding fromQXmlName(const QXmlName qName)
        {
            Q_ASSERT(!qName.isNull());
            return NamespaceBinding(qName.prefix(), qName.namespaceURI());
        }

    private:
        QXmlName::PrefixCode      m_prefix;
        QXmlName::NamespaceCode   m_namespace;
    };

    /**
     * @relates NamespaceBinding
     */
    static inline uint qHash(const NamespaceBinding nb)
    {
        return (nb.prefix() << 16) + nb.namespaceURI();
    }

}

QT_END_NAMESPACE

QT_END_HEADER

#endif