/*

* Copyright (c) 2004 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:  This class implements the interface specified in CMetaDataSource

*				 when audio source is from a descriptor.

*

*/

#ifndef CMETADATASOURCEDESCRIPTOR_H

#define CMETADATASOURCEDESCRIPTOR_H

// INCLUDES

#include "MetaDataSource.h"

// CLASS DECLARATION

/**

*  This class implements the interface specified in CMetaDataSource

*  when audio source is from a descriptor.

*

*  @lib MetaDataUtility.lib

*  @since 3.0

*/

class CMetaDataSourceDescriptor : public CMetaDataSource

	{

    public:  // Constructors and destructor

        /**

        * Two-phased constructor.

		* @param aDes Source descriptor

		* @return A pointer to a new instance of this class

        */

        static CMetaDataSourceDescriptor* NewL( const TDesC8& aDes );

        /**

        * Destructor.

        */

        virtual ~CMetaDataSourceDescriptor();

    public: // Functions from base classes

        /**

        * Reads sufficient data from the source to fill the specified 8-bit descriptor

        * up to its maximum length.

        * @since 3.0

        * @param aDes Contains the data that was read

		* @param aLength How many bytes will be read

        * @return KErrNone, or one of the systemwide error codes.

		*/

		void ReadL( TDes8& aDes );

        /**

        * Reads data of specified length from the source into the specified 8-bit descriptor.

        * @since 3.0

        * @param aDes Contains the data that was read. Note that the descriptor

		*        length must be at least aLength!

		* @param aLength How many bytes will be read

        * @return KErrNone, or one of the systemwide error codes.

		*/

		void ReadL( TDes8& aDes, TInt aLength );

        /**

        * Reads data from specified position in the source into the specified 8-bit descriptor

        * up to its maximum length.

        * @since 3.0

        * @param aPos Offset from current position

		* @param aDes Contains the data that was read

        * @return KErrNone, or one of the systemwide error codes.

		*/

		void ReadL( TInt aPos, TDes8& aDes );

        /**

        * Reads data from specified position in the source into the specified 8-bit descriptor

        * up to its maximum length.

        * @since 3.0

        * @param aPos Offset from current position

		* @param aDes Contains the data that was read

		* @param aLength How many bytes will be read

        * @return KErrNone, or one of the systemwide error codes.

		*/

		void ReadL( TInt aPos, TDes8& aDes, TInt aLength );

        /**

        * Size of the source in bytes.

        * @since 3.0

        * @param aSize On return, the size is stored here.

        * @return KErrNone, or one of the systemwide error codes.

		*/

		TInt Size( TInt& aSize ) const;

	private:

        /**

        * C++ default constructor.

        */

		CMetaDataSourceDescriptor();

        /**

        * By default Symbian 2nd phase constructor is private.

        */

		void ConstructL( const TDesC8& aDes );

 	private:	// Data

		// Source descriptor

		TPtrC8 iSource;

		// Source length

		TInt iLength;

	};

#endif      // CMETADATASOURCEDESCRIPTOR_H

// End of File