/*
 * Copyright 2007, Ingo Weinhold, bonefish@users.sf.net.
 * Distributed under the terms of the MIT License.
 */
#ifndef _DISK_SYSTEM_ADD_ON_MANAGER_H
#define _DISK_SYSTEM_ADD_ON_MANAGER_H

#include <FindDirectory.h>
#include <List.h>
#include <Locker.h>


class BDiskSystemAddOn;


namespace BPrivate {


class DiskSystemAddOnManager {
public:
        static  DiskSystemAddOnManager* Default();

                        bool                            Lock();
                        void                            Unlock();

                        // load/unload all disk system add-ons
                        status_t                        LoadDiskSystems();
                        void                            UnloadDiskSystems();

                        // manager must be locked
                        int32                           CountAddOns() const;
                        BDiskSystemAddOn*       AddOnAt(int32 index) const;

                        // manager will be locked
                        BDiskSystemAddOn*       GetAddOn(const char* name);
                        void                            PutAddOn(BDiskSystemAddOn* addOn);

private:
                        struct AddOnImage;
                        struct AddOn;
                        struct StringSet;

                                                                DiskSystemAddOnManager();

        static  void                            _InitSingleton();

                        AddOn*                          _AddOnAt(int32 index) const;
                        void                            _PutAddOn(int32 index);

                        status_t                        _LoadAddOns(StringSet& alreadyLoaded,
                                                                        directory_which directory);

private:
                        mutable BLocker         fLock;
                        BList                           fAddOns;
                        BList                           fAddOnsToBeUnloaded;
                        int32                           fLoadCount;

        static  DiskSystemAddOnManager* sManager;
};


}       // namespace BPrivate

using BPrivate::DiskSystemAddOnManager;

#endif  // _DISK_SYSTEM_ADD_ON_MANAGER_H