lib/qreliablefilewatch.h

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/****************************************************************************
**
** Copyright (C) 2006-2009 fullmetalcoder <fullmetalcoder@hotmail.fr>
**
** This file is part of the Edyuk project <http://edyuk.org>
** 
** This file may be used under the terms of the GNU General Public License
** version 3 as published by the Free Software Foundation and appearing in the
** file GPL.txt included in the packaging of this file.
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
****************************************************************************/

#ifndef _QRELIABLE_FILE_WATCH_H_
#define _QRELIABLE_FILE_WATCH_H_

#include "qce-config.h"

#include <QHash>
#include <QTimer>
#include <QPointer>
#include <QFileSystemWatcher>

class QCE_EXPORT QReliableFileWatch : protected QFileSystemWatcher
{
    friend class QPointer<QReliableFileWatch>;
    
    Q_OBJECT
    
    public:
        QReliableFileWatch(QObject *p = 0);
        virtual ~QReliableFileWatch();
        
    public slots:
        void addWatch(const QString& file, QObject *recipient);
        void removeWatch(const QString& file, QObject *recipient);
        
    protected:
        virtual void timerEvent(QTimerEvent *e);
        
    private slots:
        void sourceChanged(const QString& filepath);
        
    private:
        enum State
        {
            Clean       = 0,
            Recent      = 1,
            Duplicate   = 2
        };
        
        struct Watch
        {
            char state;
            quint64 size;
            quint16 checksum;
            QList< QPointer<QObject> > recipients;
        };
        
        QBasicTimer m_timer;
        
        QHash<QString, Watch> m_targets;
};

#endif // !_QRELIABLE_FILE_WATCH_H_

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