/*

 * Copyright (c) 2003-2009 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:

 * Name          : SdpBandwidthField.h

 * Part of       : SDP Codec

 * Interface     : SDK API, SDP Codec API

 * Version       : 1.0

 *

 */

 #ifndef CSDPBANDWIDTHFIELD_H

 #define CSDPBANDWIDTHFIELD_H

 //  INCLUDES

 #include <e32base.h>

 #include <stringpool.h>

 // FORWARD DECLARATIONS

 class RReadStream;

 class RWriteStream;

 // CLASS DECLARATION

 /**

  *  @publishedAll

  *  @released

  *

  *	This class encapsulates the bandwidth field of 

  *  the Session Description Protocol.

  * 

  *	The normative reference for correct formatting and values is

  *	draft-ietf-mmusic-sdp-new-14 unless specified otherwise in

  *  member documentation. The implementation supports this normative

  *  reference, but does not enforce it fully. 

  *

  *  @lib sdpcodec.lib

  */

 class CSdpBandwidthField : public CBase

 	{

 	public:// Constructors and destructor

        /**

          *	Constructs a new bandwidth field.

 		 *	

          *	@param aText A string containing a correctly 

          *         formatted field value terminated by a CRLF.

          *	@return a new instance.

          */

 		IMPORT_C static CSdpBandwidthField* DecodeL(const TDesC8& aText);

          /**

          *	Constructs a new bandwidth field and adds the pointer to the 

          *  cleanup stack.

 		 *	

          *	@param aText A string containing a correctly 

          *         formatted field value terminated by a CRLF.

          *	@return a new instance.

          */

 		IMPORT_C static CSdpBandwidthField* DecodeLC(const TDesC8& aText);

         /**

          *	Constructs a new bandwidth field.

 		 *

          *	@param aModifier Bandwidth modifier.

 		 *  @param aValue Bandwidth value.

          *	@return a new instance.

 		 */

 		IMPORT_C static CSdpBandwidthField* NewL(RStringF aModifier,

 												 TUint32 aValue);

         /**

          *	Constructs a new bandwidth field and adds the pointer to the 

          *  cleanup stack.

 		 *

          *	@param aModifier Bandwidth modifier.

 		 *  @param aValue Bandwidth value.

          *	@return a new instance.

 		 */

 		IMPORT_C static CSdpBandwidthField* NewLC(RStringF aModifier,

 												  TUint32 aValue);

         /**

 		 *	Deletes the resources held by the instance.

 		 */

 		IMPORT_C ~CSdpBandwidthField();

     public: // New functions

 		/**

 		 *	Outputs the field formatted according to SDP syntax and including

 		 *  the terminating CRLF.

 		 * 

 		 *	@param aStream Stream used for output. On return 

          *         the stream includes correctly formatted bandwidth field.

 		 */

 		IMPORT_C void EncodeL(RWriteStream& aStream) const;

 		/**

 		 *	Creates a new instance that is equal to the target.

 		 *

 		 *	@return a new instance.

 		 */

 		IMPORT_C CSdpBandwidthField * CloneL() const;

 		/**	

 		 *	Compares this instance to another for equality.

 		 *

 		 *	@param aObj The instance to compare to.

 		 *	@return ETrue if equal, EFalse if not.

 		 */

 		IMPORT_C TBool operator == (const CSdpBandwidthField& aObj) const;

 		/**

 		 *	Gets the bandwidth modifier.

 		 *

 		 *	@return The modifier that can be pre-defined in the 

 		 *          SDP string table or defined by the user.

 		 */

 		IMPORT_C RStringF Modifier() const;

 		/**

 		 *	Sets the bandwidth modifier.

 		 *

          *	@param aModifier A valid bandwidth modifier name.

 		 */

 		IMPORT_C void SetModifier(RStringF aModifier);

 		/**

 		 *	Gets the bandwidth value.

 		 *

 		 *	@return The value.

 		 */

 		IMPORT_C TUint32 Value() const;

 		/**

 		 *	Sets the bandwidth value.

 		 *

 		 *	@param aValue The Value.

 		 */

 		IMPORT_C void SetValue(TUint32 aValue);

     public:

 		/**

 		 *	Externalize the instance in a memory optimized format.

 		 *

 		 *	@param aStream The stream used for externalization.

 		 */

 		void ExternalizeL(RWriteStream& aStream) const;

 		/**

 		 *	Create a new instance from value created with ExternalizeL().

 		 *

 		 *	@param aStream The stream used for internalization.

 		 *	@return	The new instance.

 		 */

         static CSdpBandwidthField* InternalizeL(RReadStream& aStream);

     private:

         CSdpBandwidthField();

 		void ConstructL(const TDesC8& aText);

 		void ConstructL(RStringF aModifier, TUint32 aValue);

 		void ConstructL(const TDesC8& aModifier, TUint32 aValue);

         /**

          *  Copies given modifier to iModifier. If aModifier is none of 

          *  predefined ones, new modifier is added to stringPool.

          *

          *  @param aModifier Given modifier

          */

         void CopyModifierL(const TDesC8& aModifier);

     private: // Data

 		RStringF iModifier;

         TUint32 iValue;

         RStringPool iStringPool;

 	};

 #endif // CSDPBANDWIDTHFIELD_H