protected void processLineWithoutID(String line,
FastByIDMap <FastIDSet> data,
FastByIDMap <FastByIDMap <DateTime?> > timestamps)
{
if (String.IsNullOrWhiteSpace(line) || line[0] == COMMENT_CHAR)
{
return;
}
var tokens = SplitLine(line);
string userIDString = tokens[0];
string itemIDString = tokens[1];
bool hasPreference = tokens.Length > 2;
string preferenceValueString = hasPreference ? tokens[2] : "";
bool hasTimestamp = tokens.Length > 3;
string timestampString = hasTimestamp ? tokens[3] : null;
long userID = readUserIDFromString(userIDString);
long itemID = readItemIDFromString(itemIDString);
if (transpose)
{
long tmp = userID;
userID = itemID;
itemID = tmp;
}
if (hasPreference && !hasTimestamp && String.IsNullOrEmpty(preferenceValueString))
{
// Then line is of form "userID,itemID,", meaning remove
FastIDSet itemIDs = data.Get(userID);
if (itemIDs != null)
{
itemIDs.Remove(itemID);
}
removeTimestamp(userID, itemID, timestamps);
}
else
{
FastIDSet itemIDs = data.Get(userID);
if (itemIDs == null)
{
itemIDs = new FastIDSet(2);
data.Put(userID, itemIDs);
}
itemIDs.Add(itemID);
addTimestamp(userID, itemID, timestampString, timestamps);
}
}
/// This exists because FastIDSet has 'retainAll' as MASK, but there is
/// no count of the number of items in the set. size() is supposed to do
/// this but does not work.
private static int mask(FastIDSet commonSet, FastIDSet otherSet, long maxItemID)
{
int count = 0;
for (int i = 0; i <= maxItemID; i++)
{
if (commonSet.Contains(i))
{
if (otherSet.Contains(i))
{
count++;
}
else
{
commonSet.Remove(i);
}
}
}
return(count);
}
public List <IRecommendedItem> RecommendedBecause(long userID, long itemID, int howMany)
{
//Preconditions.checkArgument(howMany >= 1, "howMany must be at least 1");
IDataModel model = GetDataModel();
TopItems.IEstimator <long> estimator = new RecommendedBecauseEstimator(this, userID, itemID);
IPreferenceArray prefs = model.GetPreferencesFromUser(userID);
int size = prefs.Length();
FastIDSet allUserItems = new FastIDSet(size);
for (int i = 0; i < size; i++)
{
allUserItems.Add(prefs.GetItemID(i));
}
allUserItems.Remove(itemID);
return(TopItems.GetTopItems(howMany, allUserItems.GetEnumerator(), null, estimator));
}
public void testVersusHashSet()
{
FastIDSet actual = new FastIDSet(1);
var expected = new HashSet<int>(); //1000000
var r = RandomUtils.getRandom();
for (int i = 0; i < 1000000; i++) {
double d = r.nextDouble();
var key = r.nextInt(100);
if (d < 0.4) {
Assert.AreEqual(expected.Contains(key), actual.Contains(key));
} else {
if (d < 0.7) {
Assert.AreEqual(expected.Add(key), actual.Add(key));
} else {
Assert.AreEqual(expected.Remove(key), actual.Remove(key));
}
Assert.AreEqual(expected.Count, actual.Count() );
Assert.AreEqual(expected.Count==0, actual.IsEmpty());
}
}
}
public void testSizeEmpty()
{
FastIDSet set = new FastIDSet();
Assert.AreEqual(0, set.Count());
Assert.True(set.IsEmpty());
set.Add(1);
Assert.AreEqual(1, set.Count());
Assert.False(set.IsEmpty());
set.Remove(1);
Assert.AreEqual(0, set.Count());
Assert.True(set.IsEmpty());
}
/// This exists because FastIDSet has 'retainAll' as MASK, but there is
/// no count of the number of items in the set. size() is supposed to do
/// this but does not work.
private static int mask(FastIDSet commonSet, FastIDSet otherSet, long maxItemID) {
int count = 0;
for (int i = 0; i <= maxItemID; i++) {
if (commonSet.Contains(i)) {
if (otherSet.Contains(i)) {
count++;
} else {
commonSet.Remove(i);
}
}
}
return count;
}
