/*

* 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 CMEDIAMTPDATAPROVIDERENUMERATOR_H

#define CMEDIAMTPDATAPROVIDERENUMERATOR_H

#include <e32base.h>

#include "mmmtpenumerationcallback.h"

#include "cmmmtpdpperflog.h"

// Forward declarations

class MMTPDataProviderFramework;

class CMediaMtpDataProvider;

/**

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

* specified path or storage

*/

class CMediaMtpDataProviderEnumerator: public CActive

    {

public:

    /**

    * Two phase constructor

    * @param aFramework Reference to MMTPDataProviderFramework

    * @param aDataProvider Reference to CMediaMtpDataProvider

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

    */

    static CMediaMtpDataProviderEnumerator* NewL( MMTPDataProviderFramework& aFramework,

        CMediaMtpDataProvider& aDataProvider );

    /**

    * destructor

    */

    ~CMediaMtpDataProviderEnumerator();

    /**

    * Kick off the enumeration on the specified storage

    * @param aStorageId storage to be enumerated

    */

    void StartL( TUint32 aStorageId );

    // introduce to cleanup db at close session

    void SessionClosedL();

protected:

    // from CActive

    /**

    * Cancel the enumeration process

    */

    void DoCancel();

    void RunL();

    /**

    * Ignore the error, continue with the next one

    */

    TInt RunError( TInt aError );

private:

    /**

    * Standard C++ Constructor

    * @param aFramework Reference to MMTPDataProviderFramework

    * @param aDataProvider Reference to CMediaMtpDataProvider

    */

    CMediaMtpDataProviderEnumerator( MMTPDataProviderFramework& aFramework,

        CMediaMtpDataProvider& aDataProvider );

    void ConstructL();

    /**

    * Called when the enumeration is completed

    */

    void SignalCompleteL( MMTPEnumerationCallback& aCallback,

        TInt aError = KErrNone );

    /**

    * Get modified content and report to Symbian MTP Framework

    */

    void GetModifiedContentL( const TDesC& aStorageRoot );

private:

    // Owned

    /** MMTPDataProviderFramework used to access MTP components*/

    MMTPDataProviderFramework& iFramework;

    CMediaMtpDataProvider& iDataProvider;

    RArray<TUint> iStorages;

    TUint32 iStorageId;

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

    CMmMtpDpPerfLog* iPerfLog;

#endif

    };

#endif // CMEDIAMTPDATAPROVIDERENUMERATOR_H