Overwrite derived column in prefuse

Question

In a prefuse graph I have a derived column named "distance" created with Table.addColumn(String name, Expression expr) and a boolean runtime variable called normalize . Now I want to change the expression used to calculate the column value during runtime, depending on the value of normalize , but there is no such thing as replaceColumn() or deleteColumn() . When I try to overwrite the old column by calling addColumn() again, I get a 'Table already has column with name "distance"'.

Can I somehow programatically change the expression used to calculate the column value of distance or make it dependend from the runtime variable normalize ? I would rather not have two columns with different names, because the value is used from many places in the project and I would therefor have to implement a lot of case distinctions.

Answer 1

prefuse has an IfExpression so you can make the derived column depend on normalize .

Alternatively there is a method removeColumn(String) in Table .