williamr@4: /*
williamr@4: * Copyright (c) 2004-2007 Nokia Corporation and/or its subsidiary(-ies).
williamr@4: * All rights reserved.
williamr@4: * This component and the accompanying materials are made available
williamr@4: * under the terms of "Eclipse Public License v1.0"
williamr@4: * which accompanies this distribution, and is available
williamr@4: * at the URL "http://www.eclipse.org/legal/epl-v10.html".
williamr@4: *
williamr@4: * Initial Contributors:
williamr@4: * Nokia Corporation - initial contribution.
williamr@4: *
williamr@4: * Contributors:
williamr@4: *
williamr@4: * Description:  An interface for objects that can be written into stream.
williamr@4: *
williamr@4: */
williamr@4: 
williamr@4: 
williamr@4: #ifndef MVPBKSTREAMABLE_H
williamr@4: #define MVPBKSTREAMABLE_H
williamr@4: 
williamr@4: // INCLUDES
williamr@4: #include <e32std.h>
williamr@4: 
williamr@4: // FORWARD DECLARATIONS
williamr@4: class RReadStream;
williamr@4: class RWriteStream;
williamr@4: 
williamr@4: // CLASS DECLARATIONS
williamr@4: 
williamr@4: /**
williamr@4:  * An interface for objects that can be written into stream.
williamr@4:  */
williamr@4: class MVPbkStreamable
williamr@4:     {
williamr@4:     protected: // destructor
williamr@4:         /**
williamr@4:          * Destructor.
williamr@4:          */
williamr@4:         virtual ~MVPbkStreamable() { }
williamr@4: 
williamr@4:     public: // interface
williamr@4:         /**
williamr@4:          * Outputs this objects state to aStream.
williamr@4:          *
williamr@4:          * @param aStream A stream for writing the object state.
williamr@4:          */
williamr@4:         virtual void ExternalizeL( RWriteStream& aStream ) const = 0;
williamr@4:         
williamr@4:         /**
williamr@4:          * Returns the externalized size of the object in bytes.
williamr@4:          *
williamr@4:          * @return The externalized size of the object.
williamr@4:          */
williamr@4:         virtual TInt ExternalizedSize() const = 0;
williamr@4: 
williamr@4:         /**
williamr@4:          * Returns an extension point for this interface or NULL.
williamr@4:          *
williamr@4:          * @param aExtensionUid no extensions defined currently.
williamr@4:          * @return An extension point for this interface or NULL.
williamr@4:          */
williamr@4:         virtual TAny* StreamableExtension( TUid /*aExtensionUid*/ ) 
williamr@4:                 { return NULL; }
williamr@4: 
williamr@4:     };
williamr@4: 
williamr@4: #endif // MVPBKSTREAMABLE_H
williamr@4: 
williamr@4: //End of file