public static<V>Collector<org.osgi.util.promise.Promise<V>,List<org.osgi.util.promise.Promise<V>>,org.osgi.util.promise.Promise<List<V>>>toPromise(org.osgi.util.promise.PromiseFactory promiseFactory)
combiner
private static<E,
C extends Collection<E>>Ccombiner(C t,
C u)