Bug 182680 Use feature of new Aggregation framework of Data Engine.
DataEngine will implement new aggregation framework in 2.2.0RC0. After the implementation is finished Engine should go ahead to use new column bindings in definition of map/highlight.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/api/impl/EngineLogger.java
{
				fileLogger = createFileLogger( dirName );
				sharedHandler.setSharedLogger( fileLogger );
			}
			rootLogger.setLevel( logLevel );
		}
		rootLogger.setUseParentHandlers( false );
	}
	
	public static boolean isValidLogger( Logger logger )
	{
		Logger rootLogger = Logger.getLogger( BIRT_NAME_SPACE );
		while ( logger != null )
		{
			if ( logger == rootLogger )
			{
				return false;
			}
			logger = logger.getParent( );
		}
		return true;
	}
	/**
	 * Stop BIRT Logging and close all of the handlers. This function should only by called by the main application that started BIRT.
	 * Note: Because of a Java API's bug, an additional .lck file will be created for each log file. 
	 * 		 Please see http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4775533 for detail.    
	 */
	public static void stopEngineLogging( )
	{
		Logger rootLogger = Logger.getLogger( BIRT_NAME_SPACE );