Is there a way to make a singleton out of a generic type?  Consider
this as an example:

public interface Delegate<Ret, T> {
   public Ret transform(T t);
}

public class IdentityDelegate<T> implements Delegate<T, T> {
   public T transform(T t) { return t; }
}

Is there a way to make a singleton out of IdentityDelegate (since
clearly one size fits all classes) other than to just "drop the
generic info"?