graphicsutils/commongraphicsheaders/inc/extensioncontainer.h
changeset 0 5d03bc08d59c
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/graphicsutils/commongraphicsheaders/inc/extensioncontainer.h	Tue Feb 02 01:47:50 2010 +0200
@@ -0,0 +1,56 @@
+// 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_ */