/*

* 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          : SdpTimeField.h

* Part of       : SDP Codec

* Interface     : SDK API, SDP Codec API

* Version       : 1.0

*

*/

#ifndef CSDPTIMESFIELD_H

#define CSDPTIMESFIELD_H

//  INCLUDES

#include <e32base.h>

#include <stringpool.h>

// FORWARD DECLARATIONS

class RReadStream;

class RWriteStream;

class CSdpRepeatField;

// CLASS DECLARATION

/**

 *  @publishedAll

 *  @released

 *

 *	This class encapsulates the time field and the related zero or 

 *  more repeat times fields and an optional time zone adjustment

 *  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 CSdpTimeField : public CBase

	{

    public: // Constructors and destructor

        /**

         *	Constructs a time field.

		 * 

         *	@param aText A correctly formatted time field value

         *         terminated by a CRLF followed by zero or more repeat 

         *         times and zero or one time zone adjustment fields 

         *         separeted by a CRLF.

		 *	@param aRecurse Flag to specify whether to decode subfields 

		 *         also (ETrue) or only the time field (EFalse).

         *	@return a new instance.

         */

		IMPORT_C static CSdpTimeField * DecodeL(const TDesC8& aText, 

                                                TBool aRecurse = ETrue);

        /**

         *	Constructs a time field and adds the pointer to the cleanup stack.

		 *	

         *	@param aText A correctly formatted time field value 

         *         terminated by a CRLF followed by zero or more repeat 

         *         times and zero or one time zone adjustment fields 

         *         separeted by a CRLF.

		 *	@param aRecurse Flag to specify whether to decode subfields 

		 *         also (ETrue) or only the time field (EFalse).

         *	@return a new instance.

         */

		IMPORT_C static CSdpTimeField * DecodeLC(const TDesC8& aText,

                                                TBool aRecurse = ETrue);

        /**

         *	Constructs a time field.

		 *	

         *	@param aStartTime Session start time.

         *	@param aStopTime Session end time that must be 

         *         greater than or equal to the start time.

         *	@return a new instance.

         */

		IMPORT_C static CSdpTimeField * NewL(const TDesC8& aStartTime,

									        const TDesC8& aStopTime);

        /**

         *	Constructs a time field and adds the pointer to the cleanup stack.

		 *	

         *	@param aStartTime Session start time.

         *	@param aStopTime Session end time that must be 

         *         greater than or equal to the start time.

         *	@return a new instance.

         */

		IMPORT_C static CSdpTimeField * NewLC(const TDesC8& aStartTime,

									        const TDesC8& aStopTime);

		/**

		 *	Deletes the resources held by the instance.

		 */

		IMPORT_C ~CSdpTimeField();

    public: // New functions

		/**

		 *	Outputs the field formatted according to SDP syntax and including

		 *  the terminating CRLF. Optionally output also the related repeat

		 *  times.

		 * 

		 *	@param aStream Stream used for output. On return 

         *         the stream includes correctly formatted time field with 

         *         repeat fields if aRecurse is ETrue.

		 *	@param aRecurse Flag to specify whether to output subfields

		 *         also (ETrue) or only the time field (EFalse).

		 */

		IMPORT_C void EncodeL(RWriteStream& aStream, TBool aRecurse = ETrue) const;

		/**

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

		 *  Optionally also related repeat times are cloned.

		 *

		 *	@param aRecurse Flag to specify whether to clone subfields 

		 *         also (ETrue) or only the time field (EFalse).

		 *	@return a new instance.

		 */

		IMPORT_C CSdpTimeField * CloneL(TBool aRecurse = ETrue) const;

		/**	

		 *	Compares this instance to another for equality. Subfields are

		 *	included in comparison if present.

		 *

		 *	@param aObj The instance to compare to.

		 *	@return ETrue if equal, EFalse if not.

		 */

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

		/**

		 *	Checks the consistency of the time description and it's subfields.

		 *.

		 *	@return	ETrue if time description is valid and EFalse if not.

		 */

		IMPORT_C TBool IsValid() const;

		/**

		 *	Gets the session start time.

		 *

		 *	@return The session start time.

		 */

		IMPORT_C const TDesC8& StartTime() const;

		/**

		 *	Gets the session stop time.

		 *

		 *	@return The session stop time.

		 */

		IMPORT_C const TDesC8& StopTime() const;

		/**

		 *	Sets the session start and stop times.

		 *

         *	@param aStartTime Session start time..

         *	@param aStopTime Session end time that must be 

         *         greater than or equal to the start time.

		 *	@leave KErrSdpCodecTimeField if start time and stop time are not 

         *         correct as defined draft-ietf-mmusic-sdp-new-14.

		 */

		IMPORT_C void SetTimesL(const TDesC8& aStartTime, const TDesC8& aStopTime);

		/**

		 *	Gets the set of repeat times fields related to this time field.

		 *  This array is used directly for element insertion and removal.

		 *

		 *	The objects referenced from the array are owned by the media field

		 *  instance and must not be deleted. An object can be removed from the 

		 *  media description by setting the corresponding element to zero. By

		 *  doing so, the calling party receives ownership of the removed object.

		 *

		 *	@return The set of repeat fields.

		 */

		IMPORT_C RPointerArray<CSdpRepeatField>& RepeatFields();

    public:

		/**

         *  Externalizes the object to stream

         *

         *  @param aStream Stream where the object's state will be stored

         */

		void ExternalizeL(RWriteStream& aStream) const;

		/**

         *  Creates object from the stream data

         *

         *  @param aStream Stream where the object's state will be read

         *  @return Initialized object

         */

		static CSdpTimeField* InternalizeL(RReadStream& aStream);

        /**

         *  Creates object from the stream data.

         *	Does the "2nd phase construction" of internalization.

         *

         *  @param aStream Stream where the object's state will be read

         */

        void DoInternalizeL(RReadStream& aStream);

	private:

   		CSdpTimeField();

		void ConstructL(const TDesC8& aText, TBool aRecurse=ETrue);

		void ConstructL(const TDesC8& aStartTime, const TDesC8& aStopTime);

        TBool RepeatFieldsCompare(const CSdpTimeField& aObj) const;

    private: // Data

		HBufC8* iStartTime;

		HBufC8* iStopTime;

		RPointerArray<CSdpRepeatField> iRFields;

        RStringPool iStringPool;

		void __DbgTestInvariant() const;

	};

#endif // CSDPTIMESFIELD_H