/****************************************************************************

**

** Copyright (C) 2008-2010 Nokia Corporation and/or its subsidiary(-ies).

** All rights reserved.

** Contact: Nokia Corporation (developer.feedback@nokia.com)

**

** This file is part of the HbCore module of the UI Extensions for Mobile.

**

** GNU Lesser General Public License Usage

** 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.

**

** If you have questions regarding the use of this file, please contact

** Nokia at developer.feedback@nokia.com.

**

****************************************************************************/

#ifndef HBPLUGINNAMECACHE_P_H

#define HBPLUGINNAMECACHE_P_H

#include <QObject>

#include <QHash>

#include <QString>

#include <QMutex>

#include <QStringList>

#include <QFileSystemWatcher>

#include <QPluginLoader>

#include <hbglobal.h>

class HbPluginNameCacheThread;

class HbLockedPluginLoader;

class HB_CORE_PRIVATE_EXPORT HbPluginNameCache : public QObject

{

    Q_OBJECT

    friend class HbPluginNameCacheThread;

    friend class HbLockedPluginLoader;

public:

    typedef QStringList (*GetPluginKeys)(QObject *pluginInstance);

    typedef QString (*PluginFileNameFilter)();

    explicit HbPluginNameCache(GetPluginKeys getPluginKeys,

        PluginFileNameFilter pluginFileNameFilter = 0, QObject *parent = 0);

    ~HbPluginNameCache();

    void addWatchPath(const QString &path);

    void removeWatchPath(const QString &path);

    void scanDirectory(const QString &path);

    QString find(const QString &key);

    static QString directoryPath(const QString &path);

    void print();

private:

    void insert(const QStringList &keys, const QString &filePath);

    void remove(const QString &key);

    void removePath(const QString &filePath);

    static QString pluginFileNameFilter();

private slots:

    void directoryChanged(const QString &path);

private: // data

    Q_DISABLE_COPY(HbPluginNameCache)

    QHash<QString, QString> mCache;

    HbPluginNameCacheThread *mThread;

    QFileSystemWatcher mWatcher;

};

class HbLockedPluginLoader

{

public:

    HbLockedPluginLoader(HbPluginNameCache &nameCache, const QString &fileName, QObject *parent = 0);

    HbLockedPluginLoader(QMutex &mutex, const QString &fileName, QObject *parent = 0);

    ~HbLockedPluginLoader();

    QObject *instance();

    bool load();

    bool unload();

    QString fileName() const {return mLoader->fileName();}

private:

    QMutex &mMutex;

    QPluginLoader *mLoader;

};

#endif // HBPLUGINNAMECACHE_P_H