If-Node Implementation

Hi at all,

I am currently developing an user-defined If-Node, and I would like to know, how the If-Node handles the selection of passing an output-table to a specific or both out-ports. If I set one table to null, I will get an error, because the execute method returned an incorrect number of output tables. Could somebody help me?

Thank you!

Why don't you have a look at the sources? They should already be installed if you are using the KNIME SDK.