/// <summary>
/// Clear the Population and SeedGenres entries
/// </summary>
public void Clear()
{
foreach (Population population in Populations)
{
GenrePopulations.RemovePopulation(population.SeedPopulation);
}
if (SeedGenres != null)
{
GenrePopulations.RemovePopulation(SeedGenres);
SeedGenres = null;
}
Populations.Clear();
GenresAlreadyIncluded.Clear();
AlbumsAlreadyIncluded.Clear();
}
/// <summary>
/// Find all the albums associated with a list of genre names
/// </summary>
/// <param name="genres"></param>
/// <returns></returns>
private List <Album> GetAlbumsFromGenres(IEnumerable <string> genres)
{
List <Album> albums = new List <Album>();
// Get all the albums associated with the genres
foreach (string genre in genres)
{
Tag genreTag = FilterManagementModel.GenreTags.Tags.SingleOrDefault(tag => tag.Name == genre);
if (genreTag != null)
{
albums.AddRange(FilterManagementModel.GenreTags.Tags.Single(tag => tag.Name == genre).TaggedAlbums
.Where(alb => AlbumsAlreadyIncluded.Add(alb.AlbumId) == true).Select(ta => ta.Album));
}
else
{
}
}
return(albums);
}
/// <summary>
/// Form the initial population from all the genres and albums that can be reached from the specified initial set of genres
/// </summary>
/// <param name="startingGenres"></param>
public void AddAllReachableGenres(IEnumerable <string> startingGenres)
{
List <string> newGenres = null;
List <Album> newAlbums = null;
int expansionCount = 0;
// Start with the initial genres
List <string> currentGenres = startingGenres.ToList();
do
{
// Are there any genres that have not been seen before
newGenres = currentGenres.Where(gen => GenresAlreadyIncluded.Add(gen) == true).ToList();
if (newGenres.Count > 0)
{
// Are there any albums associated with these genres that have not been seen before
newAlbums = GetAlbumsFromGenres(newGenres);
if (newAlbums.Count > 0)
{
// Get all the genres associated with these new albums
currentGenres = newAlbums.SelectMany(alb => alb.Genre.Split(';')).ToList();
}
}
}while ((newGenres.Count > 0) && (newAlbums.Count > 0) && ((FastSpreadLimit == 0) || (++expansionCount < FastSpreadLimit)));
// Unload the genres and albums from the HashSets and use to generate the first population
Populations.Add(new Population(GenrePopulations.CreatePopulation(Id, Populations.Count, GenresAlreadyIncluded.ToList()),
GenresAlreadyIncluded.ToList(), Albums.AlbumCollection.Where(alb => AlbumsAlreadyIncluded.Contains(alb.Id))));
}
