public void LoadFile_ValidFile_Success()
{
IDataLoader dataLoader = new CSVDataLoader();
var result = dataLoader.Load(".\\IntegrationTests\\Repository\\Test.csv");
Assert.Equal(3, result.Length);
}
public BookDetails GetBookDetails()
{
IDataCacher dataCacher = new MemDataCacher();
if (dataCacher.GetData() == null)
{
IDataLoader dataLoader = new CSVDataLoader();
BookDetails bookDetails = new BookDetails();
bookDetails = dataLoader.Load();
dataCacher.SetData(bookDetails);
return(bookDetails);
}
else
{
return(dataCacher.GetData());
}
}
public List <Book> Recommend(Preference preference, int limit)
{
BooksDataService dataService = new BooksDataService();
Dictionary <string, double> pairs = new Dictionary <string, double>();
List <Book> books = new List <Book>();
IDataLoader dataLoader = new CSVDataLoader();
BookDetails bookDetails = new BookDetails();
bookDetails = dataService.GetBookDetails();
Dictionary <string, List <long> > keyValuePairs = new Dictionary <string, List <long> >();
IRatingAggregator aggregator = new RatingAggregatorClass();
keyValuePairs = aggregator.Aggregate(bookDetails, preference);
IRecommender recommender = new PearsonRecommender();
List <long> baseData = new List <long>();
foreach (BookUserRating rating in bookDetails.bookUserRatings)
{
if (string.Compare(rating.ISBN, preference.ISBN) == 0)
{
baseData.Add(rating.BookRating);
}
}
foreach (var keyValue in keyValuePairs)
{
double corValue = recommender.GetCorrelation(baseData, keyValue.Value);
pairs.Add(keyValue.Key, corValue);
}
pairs = pairs.OrderByDescending(pair => pair.Value).ToDictionary(pair => pair.Key, pair => pair.Value);
int count = 0;
foreach (var item in pairs)
{
if (count == limit)
{
break;
}
count++;
books.Add(bookDetails.books.Find(b => b.ISBN == item.Key));
}
return(books);
}
static void Main(string[] args)
{
try
{
IDataLoader dataLoader = new CSVDataLoader(); //note, we dould implement different data loaders e.g. google sheets data loader.
IStatsService statsService = new StatsService();
//note for simplicity we are not using a service locator for example.
IAssignmentService assignment = new AssignmentService(dataLoader, statsService);
assignment.DoAssignment("SampleData.csv");
}
catch (ArgumentException argEx)
{
Console.WriteLine("Invalid argument");
Console.WriteLine(argEx.Message);
}
catch (Exception ex)
{
Console.WriteLine("exceptions occured while running the program");
Console.WriteLine(ex.ToString());
}
Console.ReadLine();
}
public void LoadFile_FileNotExists_ArgumentException()
{
IDataLoader dataLoader = new CSVDataLoader();
Assert.Throws <ArgumentException>(() => dataLoader.Load(".\\IntegrationTests\\Repository\\DoesNotExists.csv"));
}
static void Main(string[] args)
{
CSVDataLoader load = new CSVDataLoader();
load.Load();
}