/** Overriden method from SQLMultiSource */
public Rating next() {
if (!hasNext()) return null;
Rating l = new Rating(instances);
Attribute[] attributes = getAttributes();
SparseInstance d = new SparseInstance(attributes.length - 2);
Long start;
try {
l.setUserId(Utils.objectToInteger(records.getObject(1)));
l.setObjectId(Utils.objectToInteger(records.getObject(2)));
int flixId = Integer.parseInt(records.getObject(2).toString());
int i = 0;
for (; i < this.attributes.length; i++) {
start = System.currentTimeMillis();
if (attributes[i].isNominal()) d.setValue(i, records.getObject(i + 3).toString());
else d.setValue(i, Utils.objectToDouble(records.getObject(i + 3)));
Oracle += System.currentTimeMillis() - start;
}
SparseInstance movie = imdb.getMovie(flixId);
d = (SparseInstance) d.mergeInstance(movie);
d.setDataset(instances);
start = System.currentTimeMillis();
records.next();
Oracle += System.currentTimeMillis() - start;
} catch (SQLException e) {
e.printStackTrace();
return null;
}
l.setRecord(d);
return l;
}
