@GwtCompatible
public interface DerivedGenerator

A generator that relies on a preexisting generator for most of its work. For example, a derived iterator generator may delegate the work of creating the underlying collection to an inner collection generator.

GwtTestSuiteGenerator expects every DerivedIterator implementation to provide a one-arg constructor accepting its inner generator as an argument). This requirement enables it to generate source code (since GWT cannot use reflection to generate the suites).