/*

* 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:  Enumerator objects

*

*/

#ifndef CABSTRACTMEDIAMTPDATAPROVIDERENUMERATOR_H

#define CABSTRACTMEDIAMTPDATAPROVIDERENUMERATOR_H

#include <e32base.h>

#include "mmmtpenumerationcallback.h"

#include "cmmmtpdpperflog.h"

// Forward declarations

class MMTPDataProviderFramework;

class MMTPObjectMgr;

class CAbstractMediaMtpDataProvider;

class CMPXMediaArray;

/**

* Defines file enumerator.  Enumerates all files/directories under a

* specified path or storage

*/

class CAbstractMediaMtpDataProviderEnumerator: public CActive

    {

public:

    /**

    * Two phase constructor

    * @param aFramework Reference to MMTPDataProviderFramework

    * @param aDataProvider Reference to Abstract Media DataProvider

    * @return A pointer to a new instance of the object

    */

    static CAbstractMediaMtpDataProviderEnumerator* NewL( MMTPDataProviderFramework& aFramework,

        CAbstractMediaMtpDataProvider& aDataProvider );

    /**

    * destructor

    */

    ~CAbstractMediaMtpDataProviderEnumerator();

    /**

    * Kick off the enumeration on the specified storage

    * @param aStorageId storage to be enumerated

    */

    void StartL( TUint32 aStorageId );

protected: // from CActive

    /**

    * Cancel the enumeration process

    */

    void DoCancel();

    void RunL();

    /**

    * Ignore the error, continue with the next one

    */

    TInt RunError( TInt aError );

private:

    enum TEnumState

    {

        EEnumNone,

        EEnumPlaylist,

        EEnumAbstractAlbum,

        EEnumCount

    };

    /**

    * Standard C++ Constructor

    * @param aFramework Reference to MMTPDataProviderFramework

    * @param aDataProvider Reference to Abstract Media DataProvider

    */

    CAbstractMediaMtpDataProviderEnumerator( MMTPDataProviderFramework& aFramework,

        CAbstractMediaMtpDataProvider& aDataProvider );

    void ConstructL();

    /**

    * Called when the enumeration is completed

    */

    void SignalCompleteL( MMTPEnumerationCallback& aCallback,

        TInt aError = KErrNone );

    void InitStorageL( );

    void ScanNextL();

    /**

    * Add a file entry to the object store

    * @param aPath current scanned file path

    */

    void AddEntryL( const TDesC& aSuid );

    /**

    */

private:

    // Owned

    /** MMTPDataProviderFramework used to access MTP components*/

    MMTPDataProviderFramework& iFramework;

    /** MTP Object Manager */

    MMTPObjectMgr& iObjectMgr;

    /** MTP Data Provider ID */

    TUint iDataProviderId;

    /** Provides Callback mechanism for completion of enumeration*/

    CAbstractMediaMtpDataProvider& iDataProvider;

    RArray<TUint> iStorages;

    TUint32 iStorageId;

    TInt iCount;

    TInt iCurrentIndex;

    TInt iEnumState;

#if defined(_DEBUG) || defined(MMMTPDP_PERFLOG)

    CMmMtpDpPerfLog* iPerfLog;

#endif

    };

#endif // CABSTRACTMEDIAMTPDATAPROVIDERENUMERATOR_H