/*

* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of "Eclipse Public License v1.0"

* which accompanies this distribution, and is available

* at the URL "http://www.eclipse.org/legal/epl-v10.html".

*

* Initial Contributors:

* Nokia Corporation - initial contribution.

*

* Contributors:

*

* Description:

*

*/

#ifndef CDLSFILES

#define CDLSFILES

#include <CdlDllWatcher.h>

/**

* A collection of CDir objects.

*/

class CCdlDirs : public CArrayPtrFlat<CDir>

	{

public:

	CCdlDirs();

	~CCdlDirs();

	};

/**

* Mixin interface for objects that want to observe activity in the file system watcher

*/

class MFsWatcherObserver

	{

public:

	virtual void NewDirsList(CCdlDirs* aNewDirs) = 0;

	};

/**

* The file system watcher active object.

* This watches the ?:\system\cdl directories for changes in the available CDL DLLs.

*/

class CFsWatcher : public CActive

	{

public:

	CFsWatcher(RFs& aFs, MFsWatcherObserver& aObserver);

	~CFsWatcher();

	void ConstructL();

	CCdlDirs* CreateDirsListL() const;

private:

	void DoCancel();

	void RunL();

	void DoRunL();

	void Queue();

private:

	RFs& iFs;

	MFsWatcherObserver& iObserver;

	};

/**

* Self driven active object that maintains a list of the currently available CDL DLLs.

* It trickles changes in this set of DLLs to it's observer. This is done one DLL at a time

* to avoid hanging up the server on a long running scan of all CDL DLLs.

*/

class CCdlDllsWatcher : public CCdlDllsWatcherBase, MFsWatcherObserver

	{

public:

	CCdlDllsWatcher(RFs& aFs, MCdlDllsObserver* aObserver);

	~CCdlDllsWatcher();

	void ConstructL();

private: // from CActive

	void DoCancel();

	void RunL();

private: // from MFsWatcherObserver

	void NewDirsList(CCdlDirs* aNewDirs);

private:

	void DoRunL();

	void Queue();

	void StartTellingObserverIfNecessaryL();

	void AddNewToObserverL();

	void RemoveCurrentFromObserverL();

private: // from CCdlDllsWatcherBase

	TInt IsPluginInRom(const TDesC& aFileName, TBool& aIsInRom) const;

private:

	class TDllList

		{

	public:

		// List functions.

		// These functions iterate all the DLLs in name order.

		// Drive order is ignored, except when the same name appears in more

		// than one drive, when CDL drive priority rules are observed.

		void Reset();

		const TEntry& Current() const;

		TBool AtEnd() const;

		void Next();

		// Current entry comparison operators.

		// These compare the current entry for two DLL lists by name then 

		// date modified.

		TBool operator==(const TDllList& aRhs) const;

		TBool operator<(const TDllList& aRhs) const;

	private:

		void SetCurrent();

	public:

		CCdlDirs* iDirs;			// not owned

		TInt iIndices[KMaxDrives];

		const TEntry* iCurrent;

		};

	TDllList iCurrent;				// .iDirs is owned

	TDllList iNew;					// .iDirs is owned

	CCdlDirs* iNext;				// owned, temporary storage for new dirs list while processing on-going

	TBool iTellingObserver;

	MCdlDllsObserver* iObserver;

	CFsWatcher* iFsWatcher;			// owned

	};

#endif