D, R>Similar to
AbstractTransformerbut is designed for collections and therefore provides
Collectorfunctionality for free.AbstractTransformer<U,
D, R>Collector<U, D>The concept of a collector is similar to its sibling
Transformer, we want to transform an
AcceptanceConditioninto a different structure.Syntactically rewrites the acceptance condition s.t.Transformer<R>Transforms an acceptance condition into an arbitrary structure.