gistfile1.java

public class ExternalNews {
  ObjectReference[] refs;
  NewsData news;
  
  public void addReference(ObjectReference ref) {
    refs.add(ref);
  }

  public Stream<ObjectReference> references() {
    return StreamSupport.join(movies.stream(), person.stream());
  }
  
  public void done() {
    for(ObjectReference r : refs) {
      if (r.getObject() instanceof MovieData) {
        news.movieRefs.add(r.getObject())
      } else if (r.getObject() instanceof PersonData) {
        news.personRefs.add(r.getObject())
      }
    }
  }
}

public class NewsData {
  private MovieReference[] movieRefs;
  private PersonReference[] personRefs;
  private EntityId[] movieIds, personIds;

  
}

public interface ObjectReference<T> {

}

public class MovieReference implements ObjectReference<Movie> {

}

public class PersonReference implements ObjectReference<Movie> {

}