private static IEnumerable<KeyValuePair<string, double>> CalculateDistances(FansubFile file, IEnumerable<string> folders, Strategy.ComparisonStrategy strategy)
{
var bagOfResults = new ConcurrentDictionary<string, double>();
var justFolders = folders.ToDictionary(key => key, value => StringUtilities.GetJustFolderName(value));
Parallel.ForEach(justFolders, folder =>
{
var projectedStrategy = strategy.Invoke(file.SeriesName, folder.Value);
var seriesName = projectedStrategy.Item1;
var projectedFolderName = projectedStrategy.Item2;
bagOfResults.TryAdd(folder.Key, StringMetricsCalculator.Instance.MeasureSimilarity(seriesName, projectedFolderName));
});
var listResult = bagOfResults.ToList();
listResult.Sort(KeyValuePairComparison);
return listResult;
}
public string Compare(FansubFile file, IEnumerable<string> folders, Strategy.ComparisonStrategy strategy)
{
var justFolderNamesMap = folders.ToDictionary(key => key, value => StringUtilities.GetJustFolderName(value));
var seriesName = file.SeriesName;
foreach (var folder in justFolderNamesMap)
{
var stringsToCompare = strategy.Invoke(seriesName, folder.Value);
var transformedSeriesName = stringsToCompare.Item1;
var transformedFolderName = stringsToCompare.Item2;
if(transformedSeriesName.Equals(transformedFolderName, StringComparison.Ordinal))
{
return folder.Key;
}
}
return null;
}
public string Compare(FansubFile file, IEnumerable<string> folders, Strategy.ComparisonStrategy strategy)
{
var distances = CalculateDistances(file, folders, strategy);
if (!distances.Any())
{
return null;
}
var headItem = distances.First();
var comparison = headItem.Value - _smudgeFactor;
var comparisonMagnitude = Math.Abs(comparison);
if (comparison >= 0.0 && comparisonMagnitude >= _epsilon)
{
return headItem.Key;
}
return null;
}
