public double userSimilarity(long userID1, long userID2)
{
int num4;
PreferenceArray array = this.dataModel.getPreferencesFromUser(userID1);
PreferenceArray array2 = this.dataModel.getPreferencesFromUser(userID2);
int num = array.length();
int num2 = array2.length();
if ((num <= 1) || (num2 <= 1))
{
return(double.NaN);
}
array = array.clone();
array2 = array2.clone();
array.sortByValue();
array2.sortByValue();
float num3 = 1f;
for (num4 = 0; num4 < num; num4++)
{
if (array2.hasPrefWithItemID(array.getItemID(num4)))
{
array.setValue(num4, num3);
num3++;
}
}
num3 = 1f;
for (num4 = 0; num4 < num2; num4++)
{
if (array.hasPrefWithItemID(array2.getItemID(num4)))
{
array2.setValue(num4, num3);
num3++;
}
}
array.sortByItem();
array2.sortByItem();
long num5 = array.getItemID(0);
long num6 = array2.getItemID(0);
int i = 0;
int num8 = 0;
double num9 = 0.0;
int num10 = 0;
while (true)
{
int num11 = (num5 < num6) ? -1 : ((num5 > num6) ? 1 : 0);
if (num11 == 0)
{
double num12 = array.getValue(i) - array2.getValue(num8);
num9 += num12 * num12;
num10++;
}
if (num11 <= 0)
{
if (++i >= num)
{
break;
}
num5 = array.getItemID(i);
}
if (num11 >= 0)
{
if (++num8 >= num2)
{
break;
}
num6 = array2.getItemID(num8);
}
}
if (num10 <= 1)
{
return(double.NaN);
}
return(1.0 - ((6.0 * num9) / ((double)(num10 * ((num10 * num10) - 1)))));
}
protected void processLine <T>(string line, FastByIDMap <T> data, FastByIDMap <FastByIDMap <DateTime?> > timestamps, bool fromPriorData)
{
bool flag2;
int num5;
PreferenceArray array2;
int num6;
float num7;
if ((line.Length == 0) || (line[0] == COMMENT_CHAR))
{
return;
}
string[] strArray = line.Split(new char[] { this.delimiter });
string str = strArray[0];
string str2 = strArray[1];
string str3 = strArray[2];
bool flag = strArray.Length > 3;
string timestampString = flag ? strArray[3] : null;
long key = this.readUserIDFromString(str);
long itemID = this.readItemIDFromString(str2);
if (this.transpose)
{
long num3 = key;
key = itemID;
itemID = num3;
}
T local = data.get(key);
if (!fromPriorData)
{
IEnumerable <Preference> source = (IEnumerable <Preference>)local;
if (flag || !string.IsNullOrWhiteSpace(str3))
{
num7 = float.Parse(str3, CultureInfo.InvariantCulture);
flag2 = false;
if (this.uniqueUserItemCheck && (source != null))
{
foreach (Preference preference in source)
{
if (preference.getItemID() == itemID)
{
flag2 = true;
preference.setValue(num7);
break;
}
}
}
if (!flag2)
{
if (source == null)
{
source = new List <Preference>(5);
data.put(key, (T)source);
}
if (source is IList <Preference> )
{
((IList <Preference>)source).Add(new GenericPreference(key, itemID, num7));
}
}
this.addTimestamp(key, itemID, timestampString, timestamps);
return;
}
if (source != null)
{
IEnumerator <Preference> enumerator = ((IEnumerable <Preference>)source.ToArray <Preference>()).GetEnumerator();
while (enumerator.MoveNext())
{
Preference current = enumerator.Current;
if (current.getItemID() == itemID)
{
if (source is IList <Preference> )
{
((IList <Preference>)local).Remove(current);
}
break;
}
}
}
removeTimestamp(key, itemID, timestamps);
return;
}
PreferenceArray array = (PreferenceArray)local;
if (flag || !string.IsNullOrWhiteSpace(str3))
{
num7 = float.Parse(str3, CultureInfo.InvariantCulture);
flag2 = false;
if (this.uniqueUserItemCheck && (array != null))
{
for (num5 = 0; num5 < array.length(); num5++)
{
if (array.getItemID(num5) == itemID)
{
flag2 = true;
array.setValue(num5, num7);
break;
}
}
}
}
else
{
if (array != null)
{
flag2 = false;
int num4 = array.length();
for (num5 = 0; num5 < num4; num5++)
{
if (array.getItemID(num5) == itemID)
{
flag2 = true;
break;
}
}
if (flag2)
{
if (num4 == 1)
{
data.remove(key);
}
else
{
array2 = new GenericUserPreferenceArray(num4 - 1);
num5 = 0;
for (num6 = 0; num5 < num4; num6++)
{
if (array.getItemID(num5) == itemID)
{
num6--;
}
else
{
array2.set(num6, array.get(num5));
}
num5++;
}
data.put(key, (T)array2);
}
}
}
removeTimestamp(key, itemID, timestamps);
goto Label_02F1;
}
if (!flag2)
{
if (array == null)
{
array = new GenericUserPreferenceArray(1);
}
else
{
array2 = new GenericUserPreferenceArray(array.length() + 1);
num5 = 0;
for (num6 = 1; num5 < array.length(); num6++)
{
array2.set(num6, array.get(num5));
num5++;
}
array = array2;
}
array.setUserID(0, key);
array.setItemID(0, itemID);
array.setValue(0, num7);
data.put(key, (T)array);
}
Label_02F1:
this.addTimestamp(key, itemID, timestampString, timestamps);
}
