private void AnalyzeTransitionToState(State newState)
{
if (_currentState == State.StartState)
{
if (newState == State.SearchResult)
{
_usefullness = CoefNewSearch;
}
}
else if (newState == State.SearchResult)
{
if (NGramAnalyzer.IsSimilar(_lastSearchRequest, _currentSearchRequest))
{
_usefullness *= CoefRetrySearch;
_lastSearchRequest = _currentSearchRequest;
}
else
{
FinishSequenceAnalyze();
_usefullness = CoefNewSearch;
_lastSearchRequest = _currentSearchRequest;
}
}
else if (newState == State.Description)
{
if (_currentState != State.Description)
{
_usefullness *= CoefViewDescription;
}
}
else
{
_usefullness = CoefSearchSuccesfull;
}
}
public void Analyze(List <Tuple <SearchRequest, double> > requests, List <ExternalCatalogBook> books,
ref BackgroundWorker worker, ref DoWorkEventArgs e)
{
int count = 0;
int reportValue = 10;
foreach (var request in requests)
{
if (worker.CancellationPending)
{
e.Cancel = true;
break;
}
double totalDistance = 0;
List <Tuple <ExternalCatalogBook, double> > distances = new List <Tuple <ExternalCatalogBook, double> >();
HashSet <ExternalCatalogBook> set = new HashSet <ExternalCatalogBook>();
string s;
if (request.Item1.GetParameter(SearchFields.Title, out s))
{
foreach (var word in GetWords(s))
{
if (ExternalCatalogProxy.index.ContainsKey(word[0]))
{
foreach (var book in ExternalCatalogProxy.index[word[0]])
{
set.Add(book);
}
}
}
}
if (request.Item1.GetParameter(SearchFields.Responsible, out s))
{
foreach (var word in GetWords(s))
{
if (ExternalCatalogProxy.index.ContainsKey(word[0]))
{
foreach (var book in ExternalCatalogProxy.index[word[0]])
{
set.Add(book);
}
}
}
}
if (request.Item1.GetParameter(SearchFields.Keywords, out s))
{
foreach (var word in GetWords(s))
{
if (ExternalCatalogProxy.index.ContainsKey(word[0]))
{
foreach (var book in ExternalCatalogProxy.index[word[0]])
{
set.Add(book);
}
}
}
}
if (request.Item1.GetParameter(SearchFields.SubjectText, out s))
{
foreach (var word in GetWords(s))
{
if (ExternalCatalogProxy.index.ContainsKey(word[0]))
{
foreach (var book in ExternalCatalogProxy.index[word[0]])
{
set.Add(book);
}
}
}
}
foreach (var book in set)
{
double distance = NGramAnalyzer.GetDistance(request.Item1, book);
if (distance <= MaximumDistance)
{
totalDistance += distance;
distances.Add(new Tuple <ExternalCatalogBook, double>(book, distance));
}
}
foreach (var distance in distances)
{
double p;
if (totalDistance > 0)
{
p = distance.Item2 / totalDistance;
}
else
{
p = 1;
}
double weight = p * request.Item2;
if (_result.ContainsKey(distance.Item1))
{
_result[distance.Item1] += Math.Round(weight, 3);
}
else
{
_result.Add(distance.Item1, Math.Round(weight, 3));
}
}
count++;
if (count % reportValue == 0)
{
worker.ReportProgress(count, BackgroundWorkerState.ClusterAnalyzerReportProgress);
}
}
}
