public static IEnumerable <IndexedMeme> QueryTagCombination(string[] s, TagCombiner mode = TagCombiner.AND)
{
IEnumerable <IndexedMeme> tagQuery;
switch (mode)
{
case TagCombiner.AND:
tagQuery = _base.IndexedWhere(x => s.All(y => x.Tags.Contains(y)));
break;
case TagCombiner.NAND:
tagQuery = _base.IndexedWhere(x => !s.All(y => x.Tags.Contains(y)));
break;
case TagCombiner.OR:
tagQuery = _base.IndexedWhere(x => s.Any(y => x.Tags.Contains(y)));
break;
case TagCombiner.NOR:
tagQuery = _base.IndexedWhere(x => !s.Any(y => x.Tags.Contains(y)));
break;
case TagCombiner.MAXCOUNT:
var tempQuery = _base.Select(x => (x, x.Tags.Count(y => s.Contains(y))));
int maxMatch = tempQuery.Max(x => x.Item2);
tagQuery = tempQuery.Where(x => x.Item2 == maxMatch).Select(x => new IndexedMeme(x.x, _base.IndexOf(x.x)));
break;
default:
throw new NotImplementedException(mode.ToString() + " ist nicht implementiert");
}
return(tagQuery);
}
public static IndexedMeme ProcessTagCombination(string[] s, TagCombiner mode = TagCombiner.AND)
{
var tagQuery = QueryTagCombination(s, mode);
if (!tagQuery.Any())
{
return(new IndexedMeme(null, -1));
}
var m = tagQuery.Rand();
return(m);
}
