sfg

@Override
    public void updateOtherTitleContribution(
            ContributionUpdate<OtherTitle> contribution,
            Long contributionId,
            Long userId
    ) throws ResourceNotFoundException {
        log.info("Called with contribution {}, contributionId {}, userId {}",
                contributionId, contributionId, userId);

        final UserEntity user = this.findUser(userId);
        final ContributionEntity contributionEntity = this.findContribution(contributionId, user, MovieField.OTHER_TITLE);

        if(contribution.getElementsToAdd() != null) {
            this.validIds(contributionEntity.getIdsToAdd(), contribution.getElementsToAdd().keySet());
        }
        if(contribution.getElementsToUpdate() != null) {
            this.validIds(contributionEntity.getIdsToUpdate().keySet(), contribution.getElementsToUpdate().keySet());
        }
        if(contribution.getIdsToDelete() != null) {
            this.validIds(contributionEntity.getIdsToDelete(), contribution.getIdsToDelete());
        }

        // UPDATE

        if(contribution.getElementsToUpdate() != null) {
            for (final Iterator<Map.Entry<Long, Long>> it = contributionEntity.getIdsToUpdate().entrySet().iterator(); it.hasNext(); )
            {
                if (!contribution.getElementsToUpdate().containsKey(it.next().getKey())) {
                    final MovieOtherTitle oldTitle = this.entityManager.find(MovieOtherTitle.class, it.next().getValue());
                    final MovieOtherTitle newTitle = this.entityManager.find(MovieOtherTitle.class, it.next().getKey());

                    it.remove();
                    this.entityManager.remove(newTitle);
                    oldTitle.setReportedForUpdate(false);
                }
            }

            contribution.getElementsToUpdate().forEach((key, value) -> {
                this.moviePersistenceService.updateOtherTitle(value, key);
            });
        } else  {
            for (final Iterator<Map.Entry<Long, Long>> it = contributionEntity.getIdsToUpdate().entrySet().iterator(); it.hasNext(); )
        {
                final MovieOtherTitle oldTitle = this.entityManager.find(MovieOtherTitle.class, it.next().getValue());
                final MovieOtherTitle newTitle = this.entityManager.find(MovieOtherTitle.class, it.next().getKey());

                it.remove();
                this.entityManager.remove(newTitle);
                oldTitle.setReportedForUpdate(false);
            }
        }

        // DELETE

        if(contribution.getIdsToDelete() != null) {
            final List<Long> idsToDelete = new ArrayList<>(contribution.getIdsToDelete());

            for (final Iterator<Long> it = contributionEntity.getIdsToDelete().iterator(); it.hasNext(); ) {
                final Long id = it.next();
                if (!idsToDelete.contains(id)) {
                    it.remove();
                }
            }
        } else {
            for (final Iterator<Long> it = contributionEntity.getIdsToDelete().iterator(); it.hasNext(); ) {
                it.remove();
            }
        }

         // ADD

        if(contribution.getElementsToAdd() != null) {
            for (final Iterator<Long> it = contributionEntity.getIdsToAdd().iterator(); it.hasNext(); ) {
                final Long id = it.next();
                if (!contribution.getElementsToAdd().containsKey(id)) {
                    it.remove();
                    this.entityManager.remove(this.movieInfoRepository.findOne(id));
                }
            }

            contribution.getElementsToAdd().forEach((key, value) -> {
                this.moviePersistenceService.updateOtherTitle(value, key);
            });
        } else {
            for (final Iterator<Long> it = contributionEntity.getIdsToAdd().iterator(); it.hasNext(); ) {
                final Long id = it.next();
                it.remove();
                this.entityManager.remove(this.movieInfoRepository.findOne(id));
            }
        }

        // ADD

        if(contribution.getNewElementsToAdd() != null) {
            contribution.getNewElementsToAdd()
                    .forEach(otherTitle -> {
                        final Long id = this.moviePersistenceService.createOtherTitle(otherTitle, contributionEntity.getMovie(), user);
                        contributionEntity.getIdsToAdd().add(id);
                    });
        }
//
        contributionEntity.setSources(contribution.getSources());
        Optional.ofNullable(contribution.getComment()).ifPresent(contributionEntity::setUserComment);
    }