/****************************************************************************
**
** Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies).
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** This file is part of the QtXmlPatterns 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
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** additional rights. These rights are described in the Nokia Qt LGPL
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** 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
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****************************************************************************/

//
//  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_XsdIdCache_H
#define Patternist_XsdIdCache_H

#include "qschemacomponent_p.h"

#include <QtCore/QExplicitlySharedDataPointer>
#include <QtCore/QReadWriteLock>
#include <QtCore/QSet>
#include <QtCore/QString>

QT_BEGIN_HEADER

QT_BEGIN_NAMESPACE

namespace QPatternist
{
    /**
     * @short Helper class for keeping track of all existing IDs in a schema.
     *
     * @ingroup Patternist_schema
     * @author Tobias Koenig <tobias.koenig@trolltech.com>
     */
    class XsdIdCache : public QSharedData
    {
        public:
            typedef QExplicitlySharedDataPointer<XsdIdCache> Ptr;

            /**
             * Adds an @p id to the id cache.
             */
            void addId(const QString &id);

            /**
             * Returns whether the id cache contains the given @p id already.
             */
            bool hasId(const QString &id) const;

        private:
            QSet<QString>          m_ids;
            mutable QReadWriteLock m_lock;
    };
}

QT_END_NAMESPACE

QT_END_HEADER

#endif