public OsmRelation ToRelation(XElement element)
{
var result = new OsmRelation
{
Children = element.Elements("member").Select(me =>
{
var member = new OsmRelationMember();
var refValue = GetLong(me, "ref");
var type = (string)me.Attribute("type");
var role = (string)me.Attribute("role");
switch (type)
{
case "node":
member.Type = OsmEntityType.Node;
break;
case "way":
member.Type = OsmEntityType.Way;
break;
case "relation":
member.Type = OsmEntityType.Relation;
break;
}
member.Id = refValue;
member.Role = role;
return member;
}).ToArray()
};
return ReadEntity(element, result) ? result : null;
}
private IEnumerable<OsmNode> GetChildNodes(OsmRelation relation)
{
var childNodeIds = relation.Children.Where(c => c.Type == OsmEntityType.Node).Select(w => w.Id).ToArray();
var result = database.GetCollection<OsmNode, OsmNodeCollection>().AsQueryable().Where(r => r.Id.In(childNodeIds)).ToArray();
if ( result.Length < childNodeIds.Length )
{
log.Warn("Unable to find all child nodes for {0}",relation);
}
return result;
}
private IEnumerable<OsmEntity> GetChildEntities(OsmRelation relation)
{
return GetChildNodes(relation).Cast<OsmEntity>().Concat(GetChildWays(relation)).Concat(GetChildRelations(relation));
}