Bug 180249 BPS39 - Centralized Chart Engine API
Centralized and clearer Engine API -Create one single entry point class ChartEngine in an api package so it's easy to find (with access to IGenerator, Serializer, Device Renderers) -Create a new IGenerator interface instead of exposing the Generator class.
chart/org.eclipse.birt.chart.engine/src/org/eclipse/birt/chart/factory/Generator.java
{
			sd = (SeriesDefinition) elSD.get( k );
			qOrthogonalSeriesDefinition = sd.getQuery( );
			if ( qOrthogonalSeriesDefinition == null )
			{
				continue;
			}
			sExpression = qOrthogonalSeriesDefinition.getDefinition( );
			if ( sExpression != null && sExpression.trim( ).length( ) > 0 )
			{
				
				if ( alExpressions.contains( sExpression ) )
				{
					int iRemovalIndex = alExpressions.indexOf( sExpression );
					if ( iRemovalIndex > iCount )
					{
						alExpressions.remove( iRemovalIndex );
						alExpressions.add( iCount++, sExpression );
					}
					else
					{
						
						
					}
				}
				else
				{
					
					alExpressions.add( iCount++, sExpression );
				}