/// <summary>
/// Gets the node with given id.
/// </summary>
public Node GetNode(long id)
{
var tile = new Tile(0, 0, 0);
var index = LoadIndex(OsmGeoType.Node, tile);
while (index != null &&
index.TryGetMask(id, out var mask))
{
var subTiles = tile.SubTilesForMask2(mask);
var subTile = subTiles.First();
if (subTile.Zoom == _zoom)
{ // load data and find node.
var stream = DatabaseCommon.LoadTile(_path, OsmGeoType.Node, subTile, _compressed);
if (stream == null)
{
Log.Warning($"Could not find subtile, it should be there: {subTile}");
return(null);
}
using (stream)
{
var source = new OsmSharp.Streams.BinaryOsmStreamSource(stream);
while (source.MoveNext(false, true, true))
{
var current = source.Current();
if (current.Id == id)
{
return(current as Node);
}
}
}
}
tile = subTile;
index = LoadIndex(OsmGeoType.Node, tile);
}
return(null);
}
/// <summary>
/// Gets a complete tile with complete ways and complete first level relations.
/// </summary>
internal IEnumerable <OsmGeo> GetRouteableTile(Tile tile, Stream stream)
{
// build a hashset of all nodes in the tile.
var nodesInTile = new Dictionary <long, Node>();
using (stream)
{
if (stream == null)
{
yield break;
}
var source = new OsmSharp.Streams.BinaryOsmStreamSource(stream);
while (source.MoveNext(false, true, true))
{
var current = source.Current();
if (!(current is Node n))
{
continue;
}
if (n.Id == null)
{
continue;
}
nodesInTile.Add(n.Id.Value, n);
}
}
// go over all ways and also include all nodes between the first/last node in the tile.
// also include one node before or after the first/last node in the tile.
var nodesToInclude = new SortedDictionary <long, Node>();
using (stream = DatabaseCommon.LoadTile(_path, OsmGeoType.Way, tile, _compressed))
{
if (stream != null)
{
var source = new OsmSharp.Streams.BinaryOsmStreamSource(stream);
while (source.MoveNext(true, false, true))
{
var current = source.Current();
var w = current as Way;
if (w?.Nodes == null)
{
continue;
}
var first = int.MaxValue;
var last = -1;
for (var n = 0; n < w.Nodes.Length; n++)
{
var nodeId = w.Nodes[n];
if (!nodesInTile.ContainsKey(nodeId))
{
continue;
}
if (n < first)
{
first = n;
}
if (n > last)
{
last = n;
}
}
if (first == int.MaxValue)
{
continue;
}
if (first > 0)
{
first--;
}
if (last < w.Nodes.Length - 1)
{
last++;
}
for (var n = first; n < last + 1; n++)
{
var nodeId = w.Nodes[n];
// get node from the nodes in the tile.
if (nodesInTile.TryGetValue(nodeId, out var node))
{ // node already there.
nodesToInclude[nodeId] = node;
continue;
}
// node is not in the tile, get it from the db if it's not included already..
if (!nodesToInclude.ContainsKey(nodeId))
{ // not not yet there, get it.
node = this.GetNode(nodeId);
nodesToInclude[nodeId] = node;
}
}
}
}
}
var hasData = nodesToInclude.Count > 0;
if (!hasData)
{
yield break;
}
// return all the nodes.
foreach (var node in nodesToInclude.Values)
{
yield return(node);
}
// returns all the ways that have at least one node.
using (stream = DatabaseCommon.LoadTile(_path, OsmGeoType.Way, tile, _compressed))
{
if (stream != null)
{
var source = new OsmSharp.Streams.BinaryOsmStreamSource(stream);
while (source.MoveNext(true, false, true))
{
var current = source.Current();
var w = current as Way;
if (w == null)
{
continue;
}
// trim nodes.
var trimmedNodes = new List <long>();
foreach (var n in w.Nodes)
{
if (!nodesToInclude.TryGetValue(n, out _))
{
continue;
}
trimmedNodes.Add(n);
}
w.Nodes = trimmedNodes.ToArray();
if (w.Nodes.Length == 0)
{
continue;
}
yield return(w);
}
}
}
// return all relations.
using (stream = DatabaseCommon.LoadTile(_path, OsmGeoType.Relation, tile, _compressed))
{
if (stream != null)
{
var source = new OsmSharp.Streams.BinaryOsmStreamSource(stream);
while (source.MoveNext(true, true, false))
{
var current = source.Current();
var r = current as Relation;
yield return(r);
}
}
}
}
