/*+
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* Copyright (c) 2009 Nokia Corporation and/or its subsidiary(-ies).+
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* All rights reserved.+
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* This component and the accompanying materials are made available+
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* under the terms of "Eclipse Public License v1.0"+
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* which accompanies this distribution, and is available+
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".+
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*+
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* Initial Contributors:+
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* Nokia Corporation - initial contribution.+
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*+
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* Contributors:+
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*+
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* Description:+
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*+
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*/+
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#ifndef CDLSFILES+
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#define CDLSFILES+
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+
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#include <CdlDllWatcher.h>+
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+
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/**+
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* A collection of CDir objects.+
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*/+
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class CCdlDirs : public CArrayPtrFlat<CDir>+
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	{+
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public:+
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	CCdlDirs();+
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	~CCdlDirs();+
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	};+
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+
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/**+
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* Mixin interface for objects that want to observe activity in the file system watcher+
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*/+
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class MFsWatcherObserver+
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	{+
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public:+
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	virtual void NewDirsList(CCdlDirs* aNewDirs) = 0;+
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	};+
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+
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/**+
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* The file system watcher active object.+
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* This watches the ?:\system\cdl directories for changes in the available CDL DLLs.+
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*/+
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class CFsWatcher : public CActive+
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	{+
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public:+
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	CFsWatcher(RFs& aFs, MFsWatcherObserver& aObserver);+
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	~CFsWatcher();+
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	void ConstructL();+
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+
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	CCdlDirs* CreateDirsListL() const;+
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+
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private:+
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	void DoCancel();+
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	void RunL();+
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	void DoRunL();+
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	void Queue();+
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+
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private:+
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	RFs& iFs;+
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	MFsWatcherObserver& iObserver;+
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	};+
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+
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+
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/**+
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* Self driven active object that maintains a list of the currently available CDL DLLs.+
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* It trickles changes in this set of DLLs to it's observer. This is done one DLL at a time+
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* to avoid hanging up the server on a long running scan of all CDL DLLs.+
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*/+
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class CCdlDllsWatcher : public CCdlDllsWatcherBase, MFsWatcherObserver+
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	{+
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public:+
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	CCdlDllsWatcher(RFs& aFs, MCdlDllsObserver* aObserver);+
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	~CCdlDllsWatcher();+
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	void ConstructL();+
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+
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private: // from CActive+
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	void DoCancel();+
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	void RunL();+
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+
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private: // from MFsWatcherObserver+
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	void NewDirsList(CCdlDirs* aNewDirs);+
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+
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private:+
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	void DoRunL();+
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	void Queue();+
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+
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	void StartTellingObserverIfNecessaryL();+
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	void AddNewToObserverL();+
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	void RemoveCurrentFromObserverL();+
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+
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private: // from CCdlDllsWatcherBase+
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	TInt IsPluginInRom(const TDesC& aFileName, TBool& aIsInRom) const;+
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+
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private:+
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	class TDllList+
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		{+
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	public:+
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		// List functions.+
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		// These functions iterate all the DLLs in name order.+
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		// Drive order is ignored, except when the same name appears in more+
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		// than one drive, when CDL drive priority rules are observed.+
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		void Reset();+
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		const TEntry& Current() const;+
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		TBool AtEnd() const;+
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		void Next();+
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+
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		// Current entry comparison operators.+
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		// These compare the current entry for two DLL lists by name then +
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		// date modified.+
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		TBool operator==(const TDllList& aRhs) const;+
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		TBool operator<(const TDllList& aRhs) const;+
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+
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	private:+
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		void SetCurrent();+
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+
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	public:+
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		CCdlDirs* iDirs;			// not owned+
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		TInt iIndices[KMaxDrives];+
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		const TEntry* iCurrent;+
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		};+
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+
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	TDllList iCurrent;				// .iDirs is owned+
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	TDllList iNew;					// .iDirs is owned+
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	CCdlDirs* iNext;				// owned, temporary storage for new dirs list while processing on-going+
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	TBool iTellingObserver;+
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	MCdlDllsObserver* iObserver;+
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	CFsWatcher* iFsWatcher;			// owned+
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	};+
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+
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#endif+
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