Execute actions on removing an field context

I would like to ask for some directions on the following:

When a custom field context is removed, what type of interface / class can be implemented / extended (JAVA), to be able to react on that to execute some action? As it is right now, we extend the AbstractMultiCFType class, but it only seems to handle remove(CustomField customField), which is for a complete custom field removal.

Does anyone know how to solve this?