/*

* Copyright (c) 2006-2009 Nokia Corporation and/or its subsidiary(-ies).

* All rights reserved.

* This component and the accompanying materials are made available

* under the terms of the License "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: 

*

*/

/**

 @file LOGGER.H

 @publishedPartner

 @released

*/

#ifndef	LOGGER_H

#define	LOGGER_H

#include <iosfwd>

enum WarnLevel

	{

	WARN_OFF,

	WARN_ERROR,

	WARN_WARN,

	WARN_INFO

	};

struct LoggerImpl;

/**

 * Logger class to log messages from the system.

 */

class Logger

{

public:

	/**

	 * Function will set the minimum warning level.

	 * Messages having warning level greated than this 

	 * won't be printed. Check WarnLevel for details.

	 */

	static bool SetLevel(WarnLevel aLev);

	/**

	 * Set the stream to which the mssage should be written.

	 */

	static bool SetStream(std::wostream& aOs);

	/**

	 * Get a reference to the stream.

	 */

	static std::wostream& Stream(); 

	/**

	 * Checks whether a warning level is allowed to print or not.

	 * @param aLev level at which the message should be printed.

	 */

	static bool ShouldPrint(WarnLevel aLev); 

private:

	static LoggerImpl& Logger::Impl();

	static LoggerImpl* iLogger;

};

/**

 * Helper macro to print infom messages

 */

#define LINFO(x)  if (Logger::ShouldPrint(WARN_INFO)) { Logger::Stream() << L"INFO: " << x << std::endl; }

/**

 * Helper macro to print warning messages

 */

#define LWARN(x)  if (Logger::ShouldPrint(WARN_WARN)) { Logger::Stream() << L"WARN: " << x << std::endl; }

/**

 * Helper macro to print error messages

 */

#define LERROR(x) if (Logger::ShouldPrint(WARN_ERROR)){ Logger::Stream() << L"ERR : " << x << std::endl; }

#endif	/* LOGGER_H */