@Override
public double[] createDistancesVector(Long myUserId) {
int totalNoUsers = countAllUsers().intValue() + 1;
double[] distances = new double[totalNoUsers];
Iterable<User> users = userRepository.findAll();
Iterator<User> iterator = users.iterator();
double[] myRatings = createActivityVector(myUserId);
while (iterator.hasNext()) {
User u = iterator.next();
Long userId = u.getId();
if (userId != myUserId) {
double[] userRatings = createActivityVector(userId);
if (RecommendationUtils.intersect(myRatings, userRatings)) {
distances[userId.intValue()] =
RecommendationUtils.cosineSimilarity(myRatings, userRatings);
} else {
distances[userId.intValue()] = Double.MIN_VALUE;
}
} else {
distances[userId.intValue()] = Double.MIN_VALUE;
}
}
return distances;
}
@Override
public Long countAllUsers() {
return userRepository.count();
}