public void parseFile(object file, string[] stopWords)
{
int f;
int.TryParse(file.ToString(), out f); //Get file ID
FileStream filestream = new FileStream(files[f], FileMode.Open, FileAccess.Read);
StreamReader streamreader = new StreamReader(filestream);
string whole = streamreader.ReadToEnd(); //Get file as string
PorterStemmer stemmer = new PorterStemmer();
streamreader.Close();
filestream.Close();
whole = whole.ToLower();
Regex rgx = new Regex(@"\r\n", RegexOptions.ECMAScript); //Remove special chars and change string to a single line
whole = rgx.Replace(whole, " ");
rgx = new Regex(@"[^0-9a-z ]+", RegexOptions.ECMAScript);
whole = rgx.Replace(whole, "");
List <string> words = whole.Split(' ').ToList <string>();
words = words.Where(e => !stopWords.Any(g => g == e)).ToList <string>();
for (int i = 0; i < words.Count; i++)
{
lock (lock1) if (isStemming ?? false)
{
words[i] = stemmer.StemWord(words[i]);
} //If stemming is turned on, stem the current word
ConcurrentDictionary <int, List <int> > indexEntry = invertedIndex.GetOrAdd(words[i], new ConcurrentDictionary <int, List <int> >()); //If the word is already in the index; get it, otherwise; add it
indexEntry.GetOrAdd(f, new List <int>()).Add(i); //If that word has already occurred in this file; get the occurance list, otherwise; create the list
lock (lock1) counter++; //Non essential counter for metrics
}
}
public void searchIndex(object fq)
{
Stopwatch s = new Stopwatch();
PorterStemmer stemmer = new PorterStemmer();
s.Start();
string fullQuery = fq.ToString();
fullQuery = fullQuery.ToLower();
Regex rgx = new Regex(@"\r\n", RegexOptions.ECMAScript); //Remove special chars and change to a single line
fullQuery = rgx.Replace(fullQuery, " ");
rgx = new Regex(@"[^0-9a-z ]+", RegexOptions.ECMAScript);
fullQuery = rgx.Replace(fullQuery, "");
List <string> words = fullQuery.Split(' ').ToList <string>();
List <string> stopWords = GetStopWords();
words = words.Where(e => !stopWords.Any(g => g == e)).ToList <string>(); //Turn string of search terms into a list, remove stopwords
List <List <int> > result = new List <List <int> >();
List <int> held;
ConcurrentDictionary <int, List <int> > temp;
bool nonePresent = true;
words.Distinct();
for (int i = 0; i < words.Count; i++)
{
lock (lock1) if (isStemming ?? false)
{
words[i] = stemmer.StemWord(words[i]);
} //If stemming is on; stem the search term
if (invertedIndex.ContainsKey(words[i]))
{
invertedIndex.TryGetValue(words[i], out temp);
held = temp.Keys.ToList(); //Get a list of all file IDs containing the current search term
result.Add(held); //Add that list to a collection of lists
nonePresent = false;
}
}
if (nonePresent)
{
listBox.Items.Add("No search terms had a match in the dataset.");
}
else
{
if (searchType == 1)
{
held = IntersectAll(result);
}
else if (searchType == 2)
{
held = CombineAll(result);
}
else
{
held = SubtractIntersection(result);
}
foreach (int i in held)
{
if (!listBox.Items.Contains(files[i]))
{
listBox.Items.Add(files[i]); //Only list the file if it hasn't been listed already
}
}
}
s.Stop();
Console.WriteLine("Search Time: " + s.Elapsed);
}
