1 // Copyright (c) 1995-2009 Nokia Corporation and/or its subsidiary(-ies).

     2 // All rights reserved.

     3 // This component and the accompanying materials are made available

     4 // under the terms of "Eclipse Public License v1.0"

     5 // which accompanies this distribution, and is available

     6 // at the URL "http://www.eclipse.org/legal/epl-v10.html".

     7 //

     8 // Initial Contributors:

     9 // Nokia Corporation - initial contribution.

    10 //

    11 // Contributors:

    12 //

    13 // Description:

    14 //

    15 

    16 #ifndef EXTENSIONCONTAINER_H_

    17 #define EXTENSIONCONTAINER_H_

    18 

    19 class CExtensionContainer:public CBase

    20     {

    21 public:

    22     /** Get Extension Interface.

    23      *  Implemented using the CBase::Extension_() mechanism 

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

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

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

    27      **/

    28         inline TAny* GetInterface(TUint aExtensionId);

    29     /** Get Extension Interface - templated helper.

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

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

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

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

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

    35      **/

    36         template <class MClass> MClass* GetInterface()

    37         {

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

    39         }

    40     };

    41 

    42 inline TAny* CExtensionContainer::GetInterface(TUint aExtensionId)

    43     {

    44     TAny*   retVal=NULL;

    45     //Note that extension is intentionally not overloaded in CExtensionContainer

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

    47         {

    48         return NULL;

    49         }

    50     else

    51         {

    52         return retVal;

    53         }

    54     }

    55 

    56 #endif /* EXTENSIONCONTAINER_H_ */