/*

* 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        : sipdialogassocbase.h

* Part of     : SIP Client

* Interface   : SDK API, SIP Client API

* Version     : 1.0

*

*/

#ifndef CSIPDIALOGASSOCBASE_H

#define CSIPDIALOGASSOCBASE_H

// INCLUDES

#include <stringpool.h>

// FORWARD DECLARATIONS

class CSIPMessageElements;

class CSIPClientTransaction;

class CSIPDialog;

class CSIPRefresh;

class CSIPServerTransaction;

class CSIPDialogAssocImplementation;

// CLASS DECLARATION

/**

*  @publishedAll

*  @released

*

*  Base class for SIP dialog associations. It provides services for getting

*  associated SIP dialog, actual dialog association type and for sending non

*  target refresh requests within the dialog association.

*  @lib sipclient

*/

class CSIPDialogAssocBase : public CBase

	{

	public: // Destructor

		/**

		* Destructor

        * @internalComponent		

		*/

		virtual ~CSIPDialogAssocBase();    

	public: // New functions

		/**

		* Gets the dialog this dialog association belongs to

		* @return associated dialog

		*/

		IMPORT_C const CSIPDialog& Dialog() const;

		/**

		* Gets dialog this dialog association belongs to

		* @return associated dialog

		*/

		IMPORT_C CSIPDialog& Dialog();

		/**

		* Creates SIP request and sends it to the remote target.

		* This function should be used for sending SIP extension

		* requests within dialog assocation that do not cause 

		* sip dialog associations to be created. In SIP terms

		* this request is non target refresh request.

		* @pre SIPDialog().State() != CSIPDialog::EInit &&

		*      SIPDialog().State() != CSIPDialog::ETerminated

        * @pre Dialog().Connection().State() == EActive

		* @pre aMethod != "REGISTER" |"INVITE" | "BYE" | "CANCEL" | "ACK" |

        *   "SUBSCRIBE" | "NOTIFY" | "UPDATE" | "PRACK" | "REFER"

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

        *   Ownership is transferred.

		* @return SIP extension client transaction. Ownership is transferred.

		* @leave KErrSIPInvalidDialogState If dialog's state is not correct

		* @leave KErrArgument if invalid value has been set to aMethod		

		* @leave KErrSIPResourceNotAvailable if a required SIP Client API

		*	object has been deleted

		* @capability NetworkServices

		*/

		IMPORT_C virtual CSIPClientTransaction*

            SendNonTargetRefreshRequestL(RStringF aMethod,

                                         CSIPMessageElements* aElements);

        /**

        * Gets dialog association type.

        *

        * @return dialog association type e.g. "INVITE", "SUBSCRIBE" etc...

        */

        IMPORT_C RStringF Type() const;

		/**

        * Tests if the request is a non target refresh request

        * @param aMethod a method to test

        * @return ETrue if is non target refresh request; EFalse otherwise

        */        

        IMPORT_C TBool IsNonTargetRefreshRequest(RStringF aMethod) const;

	public: // New functions, for internal use

		/**

		* Returns the implementation instance.

 		* @return CSIPDialogAssocImplementation

		*/

		CSIPDialogAssocImplementation& Implementation();

		/**

        * Searches for a refresh with the matching id. Default implementation

        * returns NULL. Those classes derived from CSIPDialogAssocBase, which

        * can contain refreshes must implement this function for searching the

        * correct refresh.

        *

        * @return CSIPRefresh if found, NULL otherwise. 

        *         The ownership is not transferred.

        * @internalComponent

        */

        virtual CSIPRefresh* FindRefresh(TUint32 aRefreshId);

        /**

        * @internalComponent

        */

		virtual void DeletingRefresh(CSIPRefresh& aRefresh, TUint32 aRefreshId);

	protected: // Constructors, for internal use

        /*

		* Constructor

		*/

        CSIPDialogAssocBase();

        void ConstructL(RStringF aType, CSIPDialog& aDialog);

        void ConstructL(RStringF aType,

        				CSIPDialog& aDialog,

        				CSIPServerTransaction& aTransaction);

    protected: // Data

        /**

        * Implementation instance, CSIPDialogAssocBase owns it

        * @internalComponent

        */

		CSIPDialogAssocImplementation* iImplementation;

	private: // For testing purposes

#ifdef CPPUNIT_TEST

        friend class CSIPInviteDialogAssoc_Test;

#endif

		void __DbgTestInvariant() const;

	};

#endif