/*

* 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:

*

*/

/**

 @file

 @publishedPartner

 @released

*/

#ifndef FDCPLUGIN_H

#define FDCPLUGIN_H

#include <e32base.h>

class MFdcPluginObserver;

/**

Base class for FDC plugins.

*/

class CFdcPlugin : public CBase

	{

	// So we can make most of this class private- validly callable only by 

	// CFdcProxy.

	friend class CFdcProxy;

private: // used by FDF to create and destroy FDC instances

	/** 

	Constructor.

	@param aImplementationUid UID of implementation to create.

	@param aObserver Handle back onto the FDF for the FDC to use.

	@return Ownership of a new FDC plugin.

	*/

	IMPORT_C static CFdcPlugin* NewL(TUid aImplementationUid, MFdcPluginObserver& aObserver);

	/**

	Called by FDF to get a pointer to an object which implements the 

	FDF API with UID aUid. This is a mechanism for allowing future change 

	to the FDF API without breaking BC in existing (non-updated) FDF 

	plugins.

	*/

	virtual TAny* GetInterface(TUid aUid) = 0;

protected: // called by concrete FDF plugins

	/** 

	Constructor

	*/

	IMPORT_C CFdcPlugin(MFdcPluginObserver& aObserver);

	/** Destructor. */

	IMPORT_C ~CFdcPlugin();

	/** 

	Accessor for the interface to the FDF. 

	@return Interface to the FDF.

	*/

	IMPORT_C MFdcPluginObserver& Observer();

	/**

	From CBase.

	*/

	IMPORT_C TInt Extension_(TUint aExtensionId, TAny*& a0, TAny* a1);

private: // owned

	/**

	UID set by ECOM when the instance is created. Used when the instance is 

	destroyed.

	*/

	TUid iInstanceId;

	/**

	Interface for calls up to the FDF.

	*/

	MFdcPluginObserver& iObserver;

	/** 

	Pad for BC-friendly future change.

	*/

	TAny* iPad;

	};

#endif // FDCPLUGIN_H