/*

* Copyright (c) 2005-2009 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        : siprefresh.h

* Part of     : SIP Client

* Interface   : SDK API, SIP Client API

* Version     : 1.0

*

*/

#ifndef CSIPREFRESH_H

#define CSIPREFRESH_H

// INCLUDES

#include <e32base.h>

#include <stringpool.h>

// FORWARD DECLARATIONS

class CSIPClientTransaction;

class CSIPMessageElements;

class MSIPRefreshAssociation;

// CLASS DECLARATION

/**

*  @publishedAll

*  @released

*

*  Class for managing SIP refresh.

*  It provides functions for getting associated sip transaction

*  and state. Class also provides functions for updating and terminating 

*  stand-alone refreshes.

*

*  Note that only stand-alone refreshes (i.e. refreshes that are not associated

*  with registration binding or dialog associations) can be terminated or

*  updated using functions defined in this class.

*

*  @lib sipclient.lib

*/

class CSIPRefresh: public CBase

	{

	public:

		/** SIP refresh states */

		enum TState

			{

			/** SIP refresh is inactive */

			EInactive,

			/** SIP refresh active */

			EActive,

			/** SIP refresh is terminated */

			ETerminated,

			/** Object is being constructed and is not yet ready for use */

			EConstructing

			};

	public: // Constructors and destructor

		/**

		* Two-phased constructor

        * @return New object. Ownership is transferred.

		*/

		IMPORT_C static CSIPRefresh* NewL();

		/**

		* Two-phased constructor

        * @return New object. Ownership is transferred.

		*/

		IMPORT_C static CSIPRefresh* NewLC();

		/**

		* Destructor

		*/

		IMPORT_C ~CSIPRefresh();

	public: // New functions

		/**

		* Gets the state of the refresh

		* @return refresh state

		*/

        IMPORT_C CSIPRefresh::TState State() const;

		/**

		* Tests if the refresh is a stand-alone refresh

		* @return ETrue if refresh is a stand-alone; EFalse otherwise

		*/

		IMPORT_C TBool IsStandAlone() const;

		/**

		* Gets the associated SIP transaction with this refresh.

        *

		* @return Associated SIP transaction or 0-pointer. Ownership is not

        *   transferred.

		*/

		IMPORT_C const CSIPClientTransaction* SIPTransaction() const;

		/**

		* Terminates the refresh by sending SIP request to the remote

        * destination. The new client transactation will be of the same type

        * as the first transaction associated with this request.

		* @pre State()==EActive

		* @pre IsStandAlone()==ETrue

		* @param aElements contains optional SIP message headers and body.

        *   Ownership is transferred.

		* @return SIP client transaction. Ownership is transferred.

		* @leave KErrSIPInvalidTransactionState if State() is not EActive

		*		 KErrNotFound if the CSIPRefresh is no longer associated to

        *        anything

        *        KSIPErrInvalidRegistrationState if trying to terminate a

        *        REGISTER refresh.

        *        KErrSIPInvalidDialogState if trying to terminate a dialog

        *		 association being refreshed. 

        * @capability NetworkServices

		*/

		IMPORT_C CSIPClientTransaction*

            TerminateL(CSIPMessageElements* aElements=0);

		/**

		* Updates the refresh by sending SIP request to the remote destination.

        * The new client transactation will be of the same type as the first

        * transaction associated with this request.

		* @pre State()==EActive

		* @pre IsStandAlone()==ETrue

		* @param aElements contains optional SIP message headers and body.

        *   Ownership is transferred.

		* @return SIP client transaction. Ownership is transferred.

        * @leave KErrSIPInvalidTransactionState if State() is not EActive

		*		 KErrNotFound if the CSIPRefresh is no longer associated to

        *        anything

        *        KErrSIPInvalidRegistrationState if trying to update a

        *        REGISTER refresh. 

        *        KSIPErrInvalidDialogState if trying to update a

        *        dialog association being refreshed. 

        * @capability NetworkServices

		*/

		IMPORT_C CSIPClientTransaction*

            UpdateL(CSIPMessageElements* aElements=0);

		/**

		* Compares this object to another object 

		* @param aRefresh a CSIPRefresh type object to compare

		* @return ETrue if the objects are equal otherwise EFalse

		*/

	    IMPORT_C TBool operator==(const CSIPRefresh& aRefresh) const;

		/**

		* Gets current refresh interval

		* @pre State()==CSIPRefresh::EActive

		* @return current refresh interval in seconds

		* @leave KErrSIPResourceNotAvailable if SIP server can't be contacted

		*	because a required resource has been deleted.		

		*/

		IMPORT_C TUint IntervalL() const;

		/**

		* Sets refresh interval. 

		* Note that SIP server choses the refresh interval. This function should

		* be used only if SIP server has indicated new refresh interval using

		* SIP messages that are not associated to the refresh needing the update.

		* @pre State()==CSIPRefresh::EActive

		* @pre aInterval > 0

		* @param aInterval a new interval in seconds

		* @leave KErrArgument if aInterval == 0

		* @leave KErrSIPInvalidTransactionState if State() is not EActive

		* @leave KErrSIPResourceNotAvailable if SIP server can't be contacted

		*	because a required resource has been deleted.

		*/

		IMPORT_C void SetIntervalL(TUint aInterval);

	public: // New functions, for internal use

	    TBool DoesMatch(TUint32 aRefreshId) const;

        /**

		* Associate the CSIPRefresh with another object.

		* @param aAssoc Object associated with the CSIPRefresh

		* @return ETrue if the objects are equal otherwise EFalse

		*/

        void SetRefreshOwner(MSIPRefreshAssociation& aAssoc);

        void RemoveRefreshOwner(const MSIPRefreshAssociation& aAssoc);

        void ChangeState(CSIPRefresh::TState aNextState);

        void UpdateRefreshState(TUint aStatusCode);

        TUint32 RefreshId() const;

        void SetRefreshIdIfEmpty(TUint32 aRefreshId);        

        RStringF RequestType() const;

        void SetRequestType(RStringF aType);

        void AddTransaction(CSIPClientTransaction& aTransaction);

        void RemoveTransaction();

        CSIPClientTransaction* Transaction();

	private: // Constructors

		CSIPRefresh();

		void ConstructL();

	private:

		void CheckStateL() const;

	private: // Data

        MSIPRefreshAssociation* iOwner;

        //Client transaction which is refreshed, not owned by CSIPRefresh.        

        CSIPClientTransaction* iClientTransaction;

		//Current state of the refresh

        TState iState;

        //RefreshId received from SIP client        

        TUint32 iRefreshId;

        //Identifies the request method which is being refreshed

        RStringF iRequestType;

	private: // For testing purposes

#ifdef CPPUNIT_TEST

	    friend class CSIP_Test;

        friend class CSIPConnection_Test;

#endif

	};

#endif