[Geotools-gt2-users] rendering vector by attributeExpression

[<j....@ge...>]

hi

as i use the attributeExpression and set a test color value column( Integer ) in shpfile 
database, then create Fill using the attributeExpression, a ClassCastException came 
out from RenderUtility: 
graphic.setColor(Color.decode(
                                 (String ) fill.getColor().getValue(feature) ) );

it might caused by the fill.getColor(0.getValue( feature ) returning an Integer Object, but 
the code above in theRenderUtility try to cast it intor String Object. so i change the code 
a little bit: call a toString() from this Object and it works.
graphic.setColor(Color.decode(
                                 fill.getColor().getValue(feature).toString() ) );

is that the right place to change. 

furthermore, maybe the other way is i could write my own AtrributeExression 
Implementation for my own purpose ( 1. return an String Object when 
getValue(feature), 2 build a math function inside the expression to transform attribute 
value to Color RGB value ). 

is that the right way to do, and is that part of the gt2 development or just need to be 
done by userself.

any helps, thanks

jin