// Needs to prevent infinite recusion using a reference id exclusion listS
public static IEnumerable <OsmGeo> WithChildren(this OsmGeo parent, IOsmGeoSource possibleChilden)
{
if (parent is Node)
{
return new[] { parent }
}
;
else if (parent is Way way)
{
return(way.Nodes.Select(n => possibleChilden.Get(OsmGeoType.Node, n))
.Append(parent));
}
else if (parent is Relation relation)
{
return(relation.Members
.SelectMany(m =>
{
var child = possibleChilden.Get(m.Type, m.Id);
return child != null
? WithChildren(child, possibleChilden)
: Enumerable.Empty <OsmGeo>();
})
.Where(m => m != null)
.Append(parent));
}
throw new Exception("OsmGeo wasn't a Node, Way or Relation.");
}
private static IEnumerable <OsmGeo> WithChildren(OsmGeo parent, IOsmGeoSource possibleChilden)
{
if (parent is Node)
{
return new[] { parent }
}
;
else if (parent is Way way)
{
return(way.Nodes.Select(n => possibleChilden.Get(OsmGeoType.Node, n))
.Append(parent));
}
else if (parent is Relation relation)
{
return(relation.Members
.SelectMany(m =>
{
var child = possibleChilden.Get(m.Type, m.Id);
return child != null
? WithChildren(child, possibleChilden) // warning, infinite recursion if references have circular members
: Enumerable.Empty <OsmGeo>();
})
.Where(m => m != null)
.Append(parent));
}
throw new Exception("OsmGeo wasn't a Node, Way or Relation.");
}
/// <summary>
/// Gets the way with the given id.
/// </summary>
public static Way GetWay(this IOsmGeoSource db, long id)
{
return(db.Get(OsmGeoType.Way, id) as Way);
}
/// <summary>
/// Gets the relation with the given id.
/// </summary>
public static Relation GetRelation(this IOsmGeoSource db, long id)
{
return(db.Get(OsmGeoType.Relation, id) as Relation);
}
/// <summary>
/// Gets the node with the given id.
/// </summary>
public static Node GetNode(this IOsmGeoSource db, long id)
{
return(db.Get(OsmGeoType.Node, id) as Node);
}