/*

* Copyright (c) 2003 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:  Channel for writer to inform about state changes to observer

*

*/

#ifndef __MCALOGGERWRITEOBSERVER_H__

#define __MCALOGGERWRITEOBSERVER_H__

//INCLUDES

#include "PrivateDefinitions.h"

//	FORWARD CLASS DECLERATIONS

class MCALoggerMessageHeader;

class MCALoggerWriteInterface;

// CLASS DECLARATION

/**

 *  Channel for writer to inform about state changes to observer

 *

 *  @lib CALogger.dll

 *  @since 2.1

 */

class MCALoggerWriteObserver

    {

    public: //Type definitions

    public: // Interface

        /**

         *	Add file to write buffer. Ownership of iFile transfered to observer

         *	@since 2.1

         *	@param iFile File information

         */

        virtual void AddFileL( TFileRelation aFile ) = 0;

        /**

         *	Remove file from write buffer.

         *	@since 2.1

         *	@param aWriter File to be removed is recognized with file writer pointer.

         */

        virtual void RemoveFileL( MCALoggerWriteInterface& aWriter ) = 0;

        /**

         *	Creates new filename for writer. Ownership is transfered to caller.

         *	@since 2.1

         *	@return Pointer to new filename.

         */

        virtual HBufC* CreateNewFilenameL() = 0;

        /**

         *	Checks memory situation. Check if there is enough memory to write

         *	file.

         *	@since 2.1

         *	@param aMemoryRequired Memory required in bytes.

         *	@return ETrue if there is enough memory and EFalse if not.

         */

        virtual TBool CheckMemoryL( TInt aMemoryRequired ) = 0;

    protected:

        /**

         * Destructor.

         */

        virtual ~MCALoggerWriteObserver() {};

    };

#endif      // __MCALOGGERWRITEOBSERVER_H__

// End of File