natplugins/natpnatfwsdpprovider/inc/nspsession.h
author Dremov Kirill (Nokia-D-MSW/Tampere) <kirill.dremov@nokia.com>
Thu, 27 May 2010 13:16:26 +0300
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/*
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* Copyright (c) 2007 Nokia Corporation and/or its subsidiary(-ies).
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* All rights reserved.
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* This component and the accompanying materials are made available
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* under the terms of "Eclipse Public License v1.0"
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* which accompanies this distribution, and is available
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* at the URL "http://www.eclipse.org/legal/epl-v10.html".
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*
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* Initial Contributors:
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* Nokia Corporation - initial contribution.
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*
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* Contributors:
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*
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* Description:  Session class description.
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*
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*/
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#ifndef NSPSESSION_H
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#define NSPSESSION_H
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#include <e32base.h>
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#include <in_sock.h>
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#include "nspplugin.h"
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#include "nsppluginreturndef.h"
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#include "natfwconnectivityapidefs.h"
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#include "mnatfwconnectivityobserver.h"
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#include "nspsessiondata.h"
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#include "nspdefs.h"
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#include "nsputdefinitions.h"
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class CDesC8Array;
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class CSdpDocument;
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class CNATFWCandidate;
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class CNATFWCandidatePair;
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class MNSPSessionObserver;
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class MNSPControllerIF;
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class CNSPContentParser;
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class CNSPMediaStreamContainer;
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class CNSPStateMachine;
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class TNSPActionSet;
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class TEventReturnStatus;
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/**
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 *  Session object that handles client requests.
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 *
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 *  Session encloses all Sdp data in separate object, which is then 
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 *  used by state machine object. After state machine completes 
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 *  processing, session notifies client via observer callbacks.
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 *
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 *  @lib natfwsdpprovider.dll
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 *  @since S60 3.2
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 */
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class CNSPSession : public CBase
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    {
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public: // Enumerations
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    /**
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     * The role of session, in signalling.
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     */
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    enum TSdpRole
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        {
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        EUndefined,
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        EOfferer,
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        EAnswerer
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        };
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public: // Constructors and destructor
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    /**
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     * A two-phase constructor.
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     */
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    static CNSPSession* NewL( MNSPControllerIF& aController,
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            MNSPSessionObserver& aSessionObserver, TUint32 aIapId,
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            const TDesC8& aDomain, TUint aProtocol );
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    /**
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     * A two-phase constructor.
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     */
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    static CNSPSession* NewLC( MNSPControllerIF& aController,
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            MNSPSessionObserver& aSessionObserver, TUint32 aIapId,
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            const TDesC8& aDomain, TUint aProtocol );
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    /**
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     * Destructor.
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     */
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    virtual ~CNSPSession();
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private: // Constructors and destructor
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    CNSPSession( MNSPControllerIF& aController, MNSPSessionObserver& aSessionObserver );
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    void ConstructL( TUint32 aIapId, const TDesC8& aDomain, TUint aProtocol );
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public: // New functions
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    /**
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     * This method is used to create NAT FW modified Sdp content, 
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     * based on initially given Sdp offer.
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     * 
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     * @since       S60 3.2
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     * @param       aOffer              Sdp document object, initial Offer.
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     */
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    TNatReturnStatus CreateOfferL( CSdpDocument*& aOffer );
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    /**
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     * This method is used to create NAT FW modified Sdp content, 
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     * Both Offer and Answer, according to received Offer.
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     * 
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     * @since       S60 3.2
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     * @param       aOffer              Sdp document object, initially 
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     *                                  received Offer.
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     * @param       aAnswer             Sdp document object, initial Answer.
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     *                                  ( non NAT FW modified )
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     */
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    TNatReturnStatus ResolveL( CSdpDocument*& aOffer, CSdpDocument*& aAnswer );
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   119
    
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    /**
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     * This method is used to interpret NAT FW modified Sdp content, 
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     * decode Answer based on initially modified Offer.
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     * 
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     * @since       S60 3.2
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     * @param       aAnswer             Sdp document object, Answer to 
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     *                                  initial offer.
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     */
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    TNatReturnStatus DecodeAnswerL( CSdpDocument*& aAnswer );
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   129
    
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    /**
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     * Offer can be updated while ResolveL is still ongoing, i.e.
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     * OfferReady callback is not yet received.
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     * 
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     * @since       S60 3.2
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     * @param       aOffer              Sdp offer document
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     */
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   137
    void UpdateL( CSdpDocument*& aOffer );
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   138
    
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   139
    /**
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     * Session closing must be done in asynchronous manner.
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     *
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     * @since       S60 3.2
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     */
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    TNatReturnStatus CloseSessionL();
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   145
    
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   146
    /**
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     * This method is used to mediate NAT FW events to corresponding 
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     * handler object.
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     * 
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     * @since       S60 3.2
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     * @param       aStreamId           The ID identifying stream(from NAT FW)
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     * @param       aEvent              The event.
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     * @param       aError              The completion code of the operation
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     * @return      Returns error code if failure in event handling.
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     */
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    TEventReturnStatus EventOccured( TUint aStreamId,
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    		MNATFWConnectivityObserver::TNATFWConnectivityEvent aEvent,
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    		TInt aError, TAny* aData );
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   159
    
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   160
    /**
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     * Callback method that is used to inform about updated Sdp Offer, asynchronously.
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   162
     * Ownership of the argument is transferred.
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   163
     * 
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   164
     * @since       S60 3.2
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   165
     * @param       aDocument           Sdp document object, updated Offer.
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   166
     */
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   167
    void UpdateSdpAsyncL( CSdpDocument* aDocument );
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   168
    
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   169
    /**
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     * This method is used to get unique session identifier.
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   171
     *
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   172
     * @since       S60 3.2
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     * @return      The ID identifying stream.
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   174
     */
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   175
    TUint SessionId() const;
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   176
    
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   177
    /**
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     * This method is used to access peer specific session data.
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   179
     *
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     * @since       S60 3.2
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   181
     * @return      Reference to session data object.
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     */
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   183
    CNSPSessionData& Data();
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   184
    
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   185
    /**
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   186
     * This method is used to access host specific media stream container.
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   187
     *
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   188
     * @since       S60 3.2
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   189
     * @return      Reference to stream container object.
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   190
     */
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   191
    CNSPMediaStreamContainer& Container();
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   192
    
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   193
    /**
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   194
     * This method is used to access array containing protocol strings.
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   195
     *
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   196
     * @since       S60 3.2
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   197
     * @return      Reference to descriptor array.
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   198
     */
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   199
    CDesC8Array& Plugins();
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   200
    
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   201
    /**
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   202
     * Removes all strings from the given array which contain postfix ".ice".
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   203
     * 
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   204
     * @since       S60 3.2
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   205
     * @param       aDesArray           Array of descriptors
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     */    
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   207
    void RemoveIce( CDesC8Array& aDesArray ) const;
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   208
    
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   209
    /**
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   210
     * Checks if given string contains postfix ".ice".
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   211
     * 
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   212
     * @since       S60 3.2
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   213
     * @param       aProtocol           Protocol string
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   214
     */
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   215
    TBool IsIce( const TDesC8& aProtocol ) const;
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   216
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   217
    /**
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   218
     * This method is used to access content parsing methods.
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   219
     *
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   220
     * @since       S60 3.2
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   221
     * @return      Reference to content parser object.
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   222
     */
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   223
    const CNSPContentParser& Parser() const;
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   224
    
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   225
    /**
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   226
     * This method is used to retrieve O/A - role from the session.
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     *
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     * @since       S60 3.2
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   229
     * @return      Current role of the session
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   230
     */
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   231
    CNSPSession::TSdpRole& Role();
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    /**
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     * This method is used to get session specific identifier.
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     *
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     * @since       S60 3.2
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     * @return      Session observer reference
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     */
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    MNSPSessionObserver& SessionObserver() const;
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    /**
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     * This method is used to get state machine actions.
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     *
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     * @since       S60 3.2
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     * @return      Action set object, automatic object from stack.
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     */
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    TNSPActionSet Actions();
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    /**
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     * This method is used to set session specific parameters.
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     *
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     * @since       S60 3.2
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     * @param       aParamKey           Enumeration key identifying parameter.
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     * @param       aParamValue         Value of the parameter.
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     * @return      status code
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     */
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    TInt SetSessionParam( CNSPPlugin::TNSPSessionParamKey aParamKey,
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            TUint aParamValue );
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    /**
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     * This method is used to set gession specific parameters.
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     *
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     * @since       S60 3.2
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     * @param       aParamKey           Enumeration key identifying parameter.
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     * @return      parameter value, or error in failure situations.
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     */
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    TInt GetSessionParam( CNSPPlugin::TNSPSessionParamKey aParamKey );
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    /**
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     * This method is used to set NAT FW specific flag for session, 
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     * specifying which NAT protocol should be used as default, 
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     * STUN or ICE/TURN.
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     *
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     * @since       S60 3.2
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     * @param       aUseIce             ETrue if ICE is in use.
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     */
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    void SetUseIce( TBool aUseIce );
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private: // New functions
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    void Proceed( TInt aRequest, TNatReturnStatus& aStatus );
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private: // data
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    /**
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     * This reference is needed for informing controller that session was
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     * deleted by the user, and hence NAT FW events are no longer acceptable.
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     * Not own.
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     */
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    MNSPControllerIF& iController;
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    /**
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     * Session observer reference.
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     * Not own.
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     */
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    MNSPSessionObserver& iSessionObserver;
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    /**
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     * Session identifier, received from NAT FW.
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     */
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    TUint iSessionId;
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    /**
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     * Flag indicating the role of the session, Offerer / Answerer.
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     */
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    TSdpRole iRole;
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    /**
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     * Session data container.
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     * Own.
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     */
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    CNSPSessionData* iSessionData;
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    /**
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     * Session media stream container.
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     * Own.
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     */
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    CNSPMediaStreamContainer* iStreamContainer;
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    /**
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     * Session state machine, i.e. actions.
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     * Own.
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     */
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    CNSPStateMachine* iStateMachine;
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    /**
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     * Protocols array, strings containing the name of used protocol.
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     * Own.
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     */
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    CDesC8Array* iProtocolsArray;
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    /**
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     * Definitions for unit testing.
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     */
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    NSP_UT_DEFINITIONS
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    };
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#define OFFERER( role ) ( CNSPSession::EOfferer == role )
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#define ANSWERER( role ) ( CNSPSession::EAnswerer == role )
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#endif // NSPSESSION_H
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// end of file