// Copyright (c) 2007-2009 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:

 // ULogger plug-in base class

 // 

 //

 /**

  @file

  @publishedPartner

  @prototype

 */

 #ifndef ULOGGERPLUGIN_H

 #define ULOGGERPLUGIN_H

 #include <e32base.h>

 #include <ecom/implementationinformation.h>

 #include <ecom/ecomresolverparams.h>

 #include <ecom/ecom.h>

 namespace Ulogger

 {

 //! Base class for all ULogger plug-ins.

 /*!

 ULogger is extensible through a plug-in framework that uses ECom for plug-in

 discovery. Deriving from this class means that all the ECom-specific logic is

 already provided for the plug-in implementer, out-of-the-box, leaving the

 plug-in code to deal with the domain-specific logic that the plug-in is supposed

 to implement only.

 Among the plug-in types that are currently supported are output plug-ins (see

 class ULogger::MOutputPlugin in uloggeroutputplugin.h) and input plug-ins (see

 class ULogger::MInputPlugin in uloggerinputplugin.h).

 Plug-ins must derive from this class in order to be compatible with ULogger.

 */

 class CPlugin : public CBase

 	{

 public:

 	/**

 	Enum to signify plug-in interface types. Used by each specific plug-in

 	interface (M-class) to identify itself as being of a particular type.

 	*/

 	enum TPluginInterface

 	{

 	EOutput,//!< output plug-in interface type

 	EInput  //!< input plug-in interface type

 	};

 public:

 	/**

 	Creates a CPlugin instance of the specified type and returns a pointer to

 	it. The type is specified as the name of the ECom plug-in DLL (without the

 	dll	extension).

 	@param aCue a descriptor containing the name of the plug-in to be created

 	@return A pointer to the newly created CPlugin object.

 	*/

 	static CPlugin* NewL(const TDesC8& aCue);

 	/**

 	Virtual destructor.

 	*/

 	virtual ~CPlugin();

 	/**

 	Return pointer to requested interface. 

 	If plug-in implements multiple interfaces, it should return pointer to

 	proper interface trough this method.

 	@param aInterfaceId Number of requested interface.

 	@return Pointer to requested interface or NULL if requested interface is not

 	        supported.

 	*/

 	virtual TAny* GetInterfaceL(TPluginInterface aInterfaceId) = 0;

 private:

 	TUid iDtor_ID_Key;		 

 	};

 } //end of namespace

 #include "uloggerplugin.inl" // Our own base implementations for ECOM

 #endif /* ULOGGERPLUGIN_H */