public Set<Campaign> findByAdvertiserId(int advertiserId) {
Set<Campaign> results = newHashSet();
Iterator<Campaign> campaignsIter = campaigns.values().iterator();
while (campaignsIter.hasNext()) {
Campaign campaign = campaignsIter.next();
if (campaign.getAdvertiser().getId().equals(advertiserId)) {
results.add(campaign);
}
}
return results;
}
