// Copyright (c) 1995-2009 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 EXTENSIONCONTAINER_H_

#define EXTENSIONCONTAINER_H_

class CExtensionContainer:public CBase

    {

public:

    /** Get Extension Interface.

     *  Implemented using the CBase::Extension_() mechanism 

     *  Note that the pointer returned is only good for the lifetime of the called CBase derived object.

     *  @param  aExtensionId    The GUID/ Well-known ID of the interface

     *  @return pointer to the interface or NULL if not available

     **/

        inline TAny* GetInterface(TUint aExtensionId);

    /** Get Extension Interface - templated helper.

     *  Resolves the ID and returned pointer based on the class name.

     *  Note that the pointer returned is only good for the lifetime of the called CBase derived object.

     *  Class name should support ETypeId intergral value, else use non-template version. 

     *  @param  MClass  The class of the interface with embedded GUID / Well known ID 

     *  @return pointer to the interface or NULL if not available

     **/

        template <class MClass> MClass* GetInterface()

        {

            return static_cast<MClass*>(GetInterface(MClass::ETypeId));

        }

    };

inline TAny* CExtensionContainer::GetInterface(TUint aExtensionId)

    {

    TAny*   retVal=NULL;

    //Note that extension is intentionally not overloaded in CExtensionContainer

    if (this->Extension_(aExtensionId,retVal,NULL)<KErrNone)

        {

        return NULL;

        }

    else

        {

        return retVal;

        }

    }

#endif /* EXTENSIONCONTAINER_H_ */