/**
* {@inheritDoc}
*/
public override IList <RecommendedItem> Recommend(Object userID, int howMany, Rescorer <Item> rescorer)
{
if (userID == null)
{
throw new ArgumentNullException("userID is null");
}
if (howMany < 1)
{
throw new ArgumentException("howMany must be at least 1");
}
if (rescorer == null)
{
throw new ArgumentNullException("rescorer is null");
}
if (log.IsDebugEnabled)
{
log.Debug("Recommending items for user ID '" + userID + '\'');
}
User theUser = this.DataModel.GetUser(userID);
ISet <Item> allItems = diffStorage.GetRecommendableItems(userID);
TopItems.Estimator <Item> estimator = new Estimator(this, theUser);
IList <RecommendedItem> topItems = TopItems.GetTopItems(howMany, allItems, rescorer, estimator);
if (log.IsDebugEnabled)
{
log.Debug("Recommendations are: " + topItems);
}
return(topItems);
}
public override IList <IRecommendedItem> Recommend(long userID, int howMany, IDRescorer rescorer)
{
//Preconditions.checkArgument(howMany >= 1, "howMany must be at least 1");
log.Debug("Recommending items for user ID '{}'", userID);
IPreferenceArray preferencesFromUser = GetDataModel().GetPreferencesFromUser(userID);
FastIDSet possibleItemIDs = GetAllOtherItems(userID, preferencesFromUser);
List <IRecommendedItem> topItems = TopItems.GetTopItems(howMany, possibleItemIDs.GetEnumerator(), rescorer,
new Estimator(this, userID));
log.Debug("Recommendations are: {}", topItems);
return(topItems);
}