else { return null; }
return null;
	private String convertDataSetRepresentation( String dsRepresentation,			int seriesDefinitionIndex )	{		if ( dsRepresentation != null )		{			String[] strTok = ChartUIUtil.getStringTokens( dsRepresentation );			StringBuffer sb = new StringBuffer( );			for ( int i = 0; i < strTok.length; i++ )			{				String strDataElement = strTok[i];				SimpleDateFormat sdf = new SimpleDateFormat( "MM/dd/yyyy" ); //$NON-NLS-1$				NumberFormat nf = NumberFormat.getNumberInstance( );				try				{					Date dateElement = sdf.parse( strDataElement );					dateElement.setTime( dateElement.getTime( )							+ ( dateElement.getTime( ) * seriesDefinitionIndex )							/ 10 );					sb.append( sdf.format( dateElement ) );				}				catch ( ParseException e )				{					try					{						Number numberElement = nf.parse( strDataElement );						sb.append( numberElement.doubleValue( )								* ( seriesDefinitionIndex + 1 ) );					}					catch ( ParseException e1 )					{						e1.printStackTrace( );					}				}				if ( i < strTok.length - 1 )				{					sb.append( "," ); //$NON-NLS-1$				}			}			return sb.toString( );		}		else		{			return null;		}	}