retrieveRankedList example

RetrieveRankedList.java

public List<ContestEntrance> retrieveRankedList ( Contest contest, ContestSignupRole role ) {
    if ( !contest.isRandomPartnered () )
        throw new IllegalArgumentException ( "only applicable for random-partnered contests" );
    
    final List<ContestEntrance> list = new ArrayList<ContestEntrance> ();
    final List<ContestRound> reverseRoundsList = new ArrayList<ContestRound> ( contest.getRounds () );
    
    Collections.reverse ( reverseRoundsList );
    for ( final ContestRound round : reverseRoundsList ) {
        if ( !( round.isScored () || round.isFinished () ) )
            throw new IllegalArgumentException ( "all rounds must be scored" );
        
        if ( round.isFinal () ) {
            if ( role == round.getDrawRole () ) {
                list.addAll ( round.getRankedEntrances () );
            } else {
                CollectionUtils.collect ( round.getRankedEntrances (), new Transformer () {
                    @Override
                    public Object transform ( Object input ) {
                        ContestEntrance entrance = (ContestEntrance) input;
                        return entrance.getDraw ().getPartnerEntrance ();
                    }
                }, list );
            }
        } else {
            List<ContestEntrance> roundEntrances = round.getEntrancesSortedByCallbackScore ( role );
            
            CollectionUtils.select ( roundEntrances, new Predicate () {
                @Override
                public boolean evaluate ( Object object ) {
                    ContestEntrance entrance = (ContestEntrance) object;
                    return entrance.getRank () != null;
                }
            }, list );
        }
    }
    
    return list;
}

RetrieveRankedList.scala

def retrieveRankedList(contest: Contest, role: ContestSignupRole) = {
  if (!contest.isRandomPartnered)
    throw new IllegalArgumentException("only applicable for random-partnered contests");

  if (contest.getRounds.asScala.count(!_.isScored) > 0)
    throw new IllegalArgumentException("all rounds must be scored");

  contest.getRounds.asScala.toList.reverse.flatMap(_.getContestEntrances.asScala)
    .filter(_.getRank != null)
    .filter(_.getContestSignup.getRole == role)
    .sortBy(_.getRank)
    .asJava
}