/*

* Copyright (c) 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:  UDP protocol implementation for IP proxy

*

*/

#ifndef CPROTOCOLUDP_H

#define CPROTOCOLUDP_H

//  INCLUDES

#include "MBPProtocol.h"

#include "MBPExpression.h"

#include "MExpressionObserverUDP.h"

#include <e32base.h>

// FORWARD DECLARATIONS

class MProtocolObserverUDP;

class MSocketWriter;

// CLASS DECLARATION

/**

* UDP protocol implementation. Writes and interpretes data in

* protocol frame.

*/

NONSHARABLE_CLASS( CProtocolUDP ) : public CBase, public MBPProtocol,

                                    public MExpressionObserver

    {

    public:  // Constructors and destructor

        /**

        * Factory function.

        * @param aObserver Pointer to observer.

        * @return New CProtocol instance.

        */

        static CProtocolUDP* NewL( MProtocolObserverUDP* aObserver );

        /**

        * Factory function.

        * @param aObserver Pointer to observer.

        * @return New CProtocol instance.

        */

        static CProtocolUDP* NewLC( MProtocolObserverUDP* aObserver );

        /**

        * Destructor.

        */

        ~CProtocolUDP();

    public: // From MExpressionObserverUDP

        void FrameStarted();

        void FrameParsedL( TUint aPort, const TDesC8& aData );

        void ProtocolErrorL( TInt aErrorCode, const TDesC8& aReceivedData );

    public: // From MBPProtocol

        void WriteFrameL( MSocketWriter& aSocketWriter,

            TUint aPeerPort, TUint aOriginalPort, const TDesC8& aData ) const;

        TBool HandleReceivedDataL( TDes8& aData, TInt& aStartPos, TInt& aLength );

    protected:

        /**

        * Default constructor.

        * @param aObserver Pointer to observer.

        */

        CProtocolUDP( MProtocolObserverUDP* aObserver );

        /**

        * 2nd phase constructor.

        */

        void ConstructL();

    private:    // Owned data

        CArrayPtr<MBPExpression>* iExpressionArray;

    private:    // Not owned data

        MProtocolObserverUDP* iObserver;

    };

#endif      // CPROTOCOLUDP_H

// End of File