Bug 112287 It's better to transfer to "new data source" dialog when creating a new data set without existing data source.
Description: It's better to transfer to "new data source" dialog automatically when creating a new data set without existing data source. Steps to reproduce: 1. There is no existing data source. 2. Create a new data set. 3. It pops up hint message, saying that "there is no data source". Actual result: it's better to transfer to "new data source" dialog box now and help users create a new data source.
chart/org.eclipse.birt.chart.reportitem.ui/src/org/eclipse/birt/chart/reportitem/ui/ReportDataServiceProvider.java
if ( ChartUIUtil.getExpressionString( cc.getName( ) )
					.equals( expression ) )
			{
				String dataType = cc.getDataType( );
				if (  dataType.equals( DesignChoiceConstants.COLUMN_DATA_TYPE_STRING ) )
				{
					return DataType.TEXT_LITERAL;
				}
				else if ( dataType.equals( DesignChoiceConstants.COLUMN_DATA_TYPE_DECIMAL )
						|| dataType.equals( DesignChoiceConstants.COLUMN_DATA_TYPE_FLOAT )
						|| dataType.equals( DesignChoiceConstants.COLUMN_DATA_TYPE_INTEGER )
						|| dataType.equals( DesignChoiceConstants.COLUMN_DATA_TYPE_BOOLEAN ) )
				{
					return DataType.NUMERIC_LITERAL;
				}
				else if ( dataType.equals( DesignChoiceConstants.COLUMN_DATA_TYPE_DATETIME )
						|| dataType.equals( DesignChoiceConstants.COLUMN_DATA_TYPE_DATE ) 
						|| dataType.equals( DesignChoiceConstants.COLUMN_DATA_TYPE_TIME ) )
				{
					return DataType.DATE_TIME_LITERAL;
				}
				else if ( dataType.equals( DesignChoiceConstants.COLUMN_DATA_TYPE_ANY ) )
				{
					return null;
				}
			}
		}
		return null;		
	}
}