#26 ConstantTransformer should take two type parameters
Your version of ConstantTransformer takes only one parameter, the first being Object. This makes certain correct uses of it uncompilable. It should simply specify to be of ConstantTransformer<I, O>, and do nothing with O.
Example of problematic code:
renderContext.setEdgeShapeTransformer(new ConstantTransformer<Shape>(myShape));
The method setEdgeShapeTransformer(Transformer<Context<Graph<SerialTree.SerialNode,Number>,Number>,Shape>) in the type RenderContext<SerialTree.SerialNode,Number> is not applicable for the arguments (ConstantTransformer<Shape>)
Where renderContext is a RenderContext from the JUNG graphics library. The relevant function has this signature:
void setEdgeShapeTransformer(Transformer<Context<Graph<V,E>,E>,Shape> edgeShapeTransformer);
