private IEnumerable <MapShape> TryParseRelation()
{
if (false == string.Equals("relation", this.reader.Name, StringComparison.OrdinalIgnoreCase))
{
throw new ArgumentException($"Excpected a 'relation' but got {this.reader.Name}");
}
long id = 0;
while (reader.MoveToNextAttribute())
{
switch (this.reader.Name)
{
case "id":
id = long.Parse(reader.Value);
break;
}
}
List <MapWay> outer = new List <MapWay>();
List <MapWay> inner = new List <MapWay>();
List <KeyValuePair <string, string> > tags = new List <KeyValuePair <string, string> >();
while (this.reader.Read())
{
switch (this.reader.Name)
{
case "relation":
goto loopexit;
case "member":
{
if (this.TryParseMember(out string role, out var mapWay))
{
if (string.Equals("outer", role, StringComparison.OrdinalIgnoreCase))
{
outer.Add(mapWay);
}
else if (string.Equals("inner", role, StringComparison.OrdinalIgnoreCase))
{
inner.Add(mapWay);
}
}
}
break;
case "tag":
{
var tag = MapDefinition.ParseTag(reader);
tags.Add(tag);
}
break;
default:
break;
}
}
loopexit:
if (false == outer.Any())
{
yield break;
}
var outerFlat = MapDefinition.FlattenMapways(outer).ToList();
foreach (var outerWay in outerFlat)
{
yield return(MapShape.Create(outerWay, tags));
}
}