/// <summary>
/// Scans each file in collection by terms
/// </summary>
/// <param name="files">The list of files</param>
/// <param name="searchTerms">the array of search terms</param>
/// <param name="synonymsOn">check if synonym checking is on</param>
/// <param name="dataSet">The dataset to retrieve synonyms from</param>
/// <returns></returns>
private List <string> ScanFilesByTerms(List <string> files, string[] searchTerms,
Boolean synonymsOn, NewWordsDataSet dataSet)
{
db = new Database(dataSet);
stemmer = new PorterStemmer();
List <string> searchFileList = files;
for (int i = 0; i < searchTerms.Length; i++)
{
List <string> fileHasTerm = new List <string>();
foreach (string file in searchFileList)
{
bool hasTerm = false;
List <string> fileWords = ReadFromFile.GetWords(file);
foreach (string word in fileWords)
{
if (synonymsOn)
{
List <string> synonyms = db.GetSynonyms(searchTerms[i]);
if (synonyms != null)
{
foreach (string s in synonyms)
{
if (word.Equals(s))
{
hasTerm = true;
}
}
}
}
if (stemmer.StemWord(word).Equals(stemmer.StemWord(searchTerms[i])))
{
hasTerm = true;
}
}
if (hasTerm)
{
fileHasTerm.Add(file);
}
}
searchFileList = fileHasTerm;
}
return(searchFileList);
}
/// <summary>
/// Returns an array of the stemmed collection
/// </summary>
/// <param name="folder"></param>
/// <returns></returns>
public string[] GetStemmedCollection(string folder)
{
stemmer = new PorterStemmer();
string[] collection = GetWordCollection(folder);
List <string> stemmedCollection = new List <string>();
foreach (string word in collection)
{
if (word.Length > 2)
{
stemmedCollection.Add(stemmer.StemWord(word));
}
}
return(stemmedCollection.ToArray());
}
///<summary>Search the InvertedIndex and return the files</summary>
///<param name="dictionary">Recieve the inverted index</param>
///<param name="querys">The query list</param>
///<return>A List of files</return>
public List <string> GetFilesFromIndex(string[] querys)
{
List <string> files = new List <string>();
stemmer = new PorterStemmer();
Dictionary <string, double>[] lists = new Dictionary <string, double> [querys.Length];
int counter = 0;
foreach (string query in querys)
{
string stemmedQuery = stemmer.StemWord(query);
lists[counter] = new Dictionary <string, double>();
if (internalIndex.ContainsKey(stemmedQuery))
{
var innerKeysAndValues = from inner in internalIndex[stemmedQuery]
select new
{
NewKey = inner.Key,
NewValue = inner.Value
};
foreach (var innerKeyAndValue in innerKeysAndValues)
{
int fileID = innerKeyAndValue.NewKey;
lists[counter].Add(converter.GetPath(fileID), innerKeyAndValue.NewValue);
}
}
counter++;
}
if (querys.Length > 1)
{
for (int i = querys.Length - 1; i > 0; i--)
{
var dict = lists[i];
var nextDict = lists[i - 1];
var joined = from kvp1 in dict
join kvp2 in nextDict on kvp1.Key equals kvp2.Key
select new { kvp1.Key, Value = kvp1.Value + kvp2.Value };
var result = joined.ToDictionary(t => t.Key, t => t.Value);
lists[i - 1] = result;
}
}
return(ListOrderByDescending(lists));
}
