// Recursive, safe against circular references, may return duplciate nodes.
private static IEnumerable <OsmGeo> ToSimpleWithChildrenCircularSafe(
this CompleteRelation complete, HashSet <OsmGeoKey> seenGeoKeys)
{
if (complete.Members == null)
{
return(new[] { complete.ToSimple() });
}
var children = new List <OsmGeo>();
foreach (var completeMember in complete.Members.Where(m => m != null))
{
var key = new OsmGeoKey(completeMember.Member.Type, completeMember.Member.Id);
if (seenGeoKeys.Add(key)) // Returns true if element was not already present
{
switch (completeMember.Member)
{
case Node node:
children.Add(node);
break;
case CompleteWay way:
children.AddRange(way.ToSimpleWithChildren());
break;
case CompleteRelation relation:
children.AddRange(relation.ToSimpleWithChildrenCircularSafe(seenGeoKeys));
break;
default:
throw new Exception("Unknown Complete Element Type.");
}
}
}
return(children.Append(complete.ToSimple()));
}
/// <summary>
/// Converts a complete relation into its simple counterpart,
/// including the simple versions of all members, and their components, recursively.
/// </summary>
public static OsmGeo[] ToSimpleWithChildren(this CompleteRelation relation)
{
var withChildren = relation.ToSimpleWithChildrenCircularSafe(new HashSet <OsmGeoKey>());
return(withChildren.DistinctByGeoKey().ToArray());
}
/// <summary>
/// Creates a complete relation.
/// </summary>
public static CompleteRelation CreateComplete(this Relation relation, IOsmGeoSource osmGeoSource)
{
if (relation == null)
{
throw new ArgumentNullException("relation");
}
if (relation.Id == null)
{
throw new Exception("relation.Id is null");
}
if (osmGeoSource == null)
{
throw new ArgumentNullException("osmGeoSource");
}
var completeRelation = new CompleteRelation();
completeRelation.Id = relation.Id.Value;
completeRelation.ChangeSetId = relation.ChangeSetId;
if (relation.Tags != null)
{
completeRelation.Tags = new TagsCollection(relation.Tags);
}
if (relation.Members != null)
{
var relationMembers = new List <CompleteRelationMember>();
for (var i = 0; i < relation.Members.Length; i++)
{
var memberId = relation.Members[i].Id;
var role = relation.Members[i].Role;
var member = new CompleteRelationMember();
member.Role = role;
switch (relation.Members[i].Type)
{
case OsmGeoType.Node:
var memberNode = osmGeoSource.GetNode(memberId);
if (memberNode == null)
{
continue;
}
var completeMemberNode = memberNode;
if (completeMemberNode != null)
{
member.Member = completeMemberNode;
}
else
{
continue;
}
break;
case OsmGeoType.Way:
var memberWay = osmGeoSource.GetWay(memberId);
if (memberWay == null)
{
continue;
}
var completeMemberWay = memberWay.CreateComplete(osmGeoSource);
if (completeMemberWay != null)
{
member.Member = completeMemberWay;
}
else
{
continue;
}
break;
case OsmGeoType.Relation:
if (relation.Id == memberId)
{
continue;
}
var relationMember = osmGeoSource.GetRelation(memberId);
if (relationMember == null)
{
continue;
}
var completeMemberRelation = relationMember.CreateComplete(osmGeoSource);
if (completeMemberRelation != null)
{
member.Member = completeMemberRelation;
}
else
{
continue;
}
break;
}
relationMembers.Add(member);
}
completeRelation.Members = relationMembers.ToArray();
}
completeRelation.TimeStamp = relation.TimeStamp;
completeRelation.UserName = relation.UserName;
completeRelation.UserId = relation.UserId;
completeRelation.Version = relation.Version;
completeRelation.Visible = relation.Visible;
return(completeRelation);
}
