/// <summary>
/// Gets a list of all categories.
/// </summary>
/// <returns>Returns a list of all categories.</returns>
public Categories GetCategories()
{
lock (_categoryLock)
{
if (_categories != null)
{
return _categories;
}
var filename = CreateFilenameForCategory();
_categories = _categoriesDataAccess.LoadCategories(filename);
if (_categories == null)
{
RetrieveCategories();
}
return _categories;
}
}
/// <summary>
/// Retrieves the categories from the channel 9 site.
/// </summary>
private void RetrieveCategories()
{
var tags = _categoryScraper.GetAllCategories<Tag>();
var shows = _categoryScraper.GetAllCategories<Show>();
var series = _categoryScraper.GetAllCategories<Series>();
if (_categories != null)
{
SetIsEnabled(tags, _categories.Tags);
SetIsEnabled(shows, _categories.Shows);
SetIsEnabled(series, _categories.Series);
}
_categories = new Categories(tags, shows, series);
}
