protected override FilterResults PerformFiltering(ICharSequence constraint)
{
FilterResults filterResults = new FilterResults();
if (constraint == null)
{
return(filterResults);
}
string filter = new string(constraint.Select(c => c).ToArray());
Predicate <string> predicate = s =>
{
// ASCII normalize strings
string value = Encoding.ASCII.GetString(Encoding.ASCII.GetBytes(s.ToLowerInvariant()));
string pattern = Encoding.ASCII.GetString(Encoding.ASCII.GetBytes(filter.ToLowerInvariant()));
// Remove non character strings
value = new string(value.Select(c => char.IsLetter(c) ? c : ' ').ToArray());
pattern = new string(pattern.Select(c => char.IsLetter(c) ? c : ' ').ToArray());
return(value.Contains(pattern));
};
string[] values = stopNames.Where(s => predicate(s)).ToArray();
filterResults.Values = FromArray(values.Select(s => new Java.Lang.String(s)).ToArray());
filterResults.Count = values.Length;
constraint.Dispose();
return(filterResults);
}
