@Override
public AjaxRecommenderCommand<R> instantiateCommand() {
final AjaxRecommenderCommand<R> command = new AjaxRecommenderCommand<R>();
/*
* initialize lists
* FIXME: is it really neccessary to initialize ALL those lists? Which are really needed?
*/
command.setRelevantGroups(new ArrayList<String>());
command.setRelevantTagSets(new HashMap<String, Map<String, List<String>>>());
command.setRecommendedTags(new TreeSet<RecommendedTag>());
command.setCopytags(new ArrayList<Tag>());
/*
* initialize post & resource
*/
command.setPost(new Post<R>());
command.getPost().setResource(this.initResource());
GroupingCommandUtils.initGroupingCommand(command);
return command;
}
@Override
public View workOn(AjaxRecommenderCommand<R> command) {
final RequestWrapperContext context = command.getContext();
/*
* only users which are logged in might post bookmarks -> send them to
* login page
*/
if (!context.isUserLoggedIn()) {
command.setResponseString("");
return Views.AJAX_XML;
}
final User loginUser = context.getLoginUser();
// ------------------------------------------------------------------------
// THIS IS AN ISSUE WE STILL HAVE TO DISCUSS:
// During the ECML/PKDD recommender challenge, many recommender systems
// couldn't deal with the high load, so we filter out those users, which
// are flagged as spammer either by an admin, or by the framework for sure
// TODO: we could probably also filter out those users, which are
// flagged as 'spammer unsure'
// ------------------------------------------------------------------------
final User dbUser = adminLogic.getUserDetails(loginUser.getName());
/*
* set the user of the post to the loginUser (the recommender might need
* the user name)
*/
command.getPost().setUser(loginUser);
/*
* initialize groups
*/
GroupingCommandUtils.initGroups(command, command.getPost().getGroups());
// set postID for recommender
command.getPost().setContentId(command.getPostID());
if ((dbUser.isSpammer())
&& ((dbUser.getPrediction() == null && dbUser.getAlgorithm() == null)
|| (dbUser.getPrediction().equals(1)
|| dbUser.getAlgorithm().equals(USERSPAMALGORITHM)))) {
// the user is a spammer
log.debug("Filtering out recommendation request from spammer");
if (this.getSpamTagRecommender() != null) {
SortedSet<RecommendedTag> result =
this.getSpamTagRecommender().getRecommendedTags(command.getPost());
this.processRecommendedTags(command, result);
} else {
command.setResponseString("");
}
} else {
// the user doesn't seem to be a spammer
/*
* get the recommended tags for the post from the command
*/
if (this.getTagRecommender() != null) {
SortedSet<RecommendedTag> result =
this.getTagRecommender().getRecommendedTags(command.getPost(), command.getPostID());
this.processRecommendedTags(command, result);
} else {
command.setResponseString("");
}
}
return Views.AJAX_XML;
}
