// 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:

//

#ifndef EXCHANGE_H

#define EXCHANGE_H

#include <bt_sock.h>

#include <btsdp.h>

class CExchanger : public CBase

/**

Abstract base class for protocols that can locate compatible devices.

@internalComponent

*/

{

	public:

		/**

		@internalComponent

		Begins a search for compatible devices.  Until successful

		completion, no other function should be called as the data

		may be invalid.

		@param aStatus

		A TRequestStatus object that is signalled when the search

		completes.  It should be used from within an active object

		*/

		virtual void LookForPeersL(TRequestStatus& aStatus) = 0;

		/**

		@internalComponent

		@return The number of compatible peer devices found

		*/

		virtual TInt Count() = 0;

		/**

		@internalComponent

		Selects the first compatible device that was found

		*/

		virtual void First() = 0;

		/**

		@internalComponent

		Retrieves the selected device, and selects the next device

		that was found.

		@param aPtr

		A reference to a TNameEntry* pointer.  On success, it is filled

		in with a pointer to a device that was found.  

		@return KErrNotFound on failure, KErrNone on success.

		*/

		virtual TInt Next(TNameEntry*& aPtr) = 0;

	protected:

		RSocketServ iSockSession;

	private:

};

class CBluetoothSeeker;

class CBluetoothExchanger : public CExchanger

/**

@internalComponent

Implementation of CExchanger for bluetooth.  Uses inquiry and the SDP 

protocol to retrieve a filtered list of all devices in range that support

the service, as defined by UUID

*/

{

	public:

		IMPORT_C static CBluetoothExchanger* NewL(const TUUID &aUUID);

		IMPORT_C static CBluetoothExchanger* NewLC(const TUUID &aUUID);

		~CBluetoothExchanger();

		//virtual implementations

		IMPORT_C virtual void LookForPeersL(TRequestStatus& aStatus);

		IMPORT_C virtual TInt Count();

		IMPORT_C virtual void First();

		IMPORT_C virtual TInt Next(TNameEntry*& aPtr);

	private:

		void ConstructL(const TUUID &aUUID);

		RSdp iSdpSession;

		RSdpDatabase iSdpDb;

		CBluetoothSeeker *iSeeker;

		TInt iDeviceIndex;

};

#endif //EXCHANGE_H