138 lines
4.8 KiB
C#
138 lines
4.8 KiB
C#
using System.Xml;
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using Newtonsoft.Json;
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namespace OSMServer;
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public class Importer
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{
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public const float regionSize = 0.01f;
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public static void Split(string xmlFilePath, string outputFolderPath)
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{
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if (!File.Exists(xmlFilePath))
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throw new FileNotFoundException();
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FileStream xmlFileStream = File.OpenRead(xmlFilePath);
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HashSet<ulong> nodesToImport = ReturnGraphNodes(XmlReader.Create(xmlFileStream));
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xmlFileStream.Position = 0;
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XmlReader xmlReader = XmlReader.Create(xmlFileStream);
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Dictionary<ulong, Node> nodes = new Dictionary<ulong, Node>();
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RegionManager regionManager = new RegionManager();
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while (xmlReader.ReadToFollowing("node"))
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{
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ulong id = Convert.ToUInt64(xmlReader.GetAttribute("id"));
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if (nodesToImport.Contains(id))
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{
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float lat = Convert.ToSingle(xmlReader.GetAttribute("lat")!.Replace('.', ','));
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float lon = Convert.ToSingle(xmlReader.GetAttribute("lon")!.Replace('.', ','));
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Node newNode = new Node(lat, lon);
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nodes.Add(id, newNode);
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regionManager.GetRegion(newNode).AddNode(id, newNode);
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}
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}
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xmlReader.Close();
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xmlFileStream.Position = 0;
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xmlReader = XmlReader.Create(xmlFileStream);
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while (xmlReader.ReadToFollowing("way"))
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{
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XmlReader wayReader = xmlReader.ReadSubtree();
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HashSet<ulong> nodesInWay = new HashSet<ulong>();
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Dictionary<string, string> tags = new Dictionary<string, string>();
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while (wayReader.Read())
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{
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if (wayReader.IsStartElement() && wayReader.Name.Equals("nd"))
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{
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nodesInWay.Add(Convert.ToUInt64(wayReader.GetAttribute("ref")));
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}
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else if (wayReader.IsStartElement() && wayReader.Name.Equals("tag"))
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{
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tags.Add(wayReader.GetAttribute("k")!, wayReader.GetAttribute("v")!);
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}
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}
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if (tags.ContainsKey("highway"))
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{
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AddConnections(nodes, nodesInWay.ToArray(), tags);
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}
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}
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foreach(Region region in regionManager.GetAllRegions())
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WriteRegion(region, outputFolderPath);
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}
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private static HashSet<ulong> ReturnGraphNodes(XmlReader xmlReader)
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{
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HashSet<ulong> retSet = new HashSet<ulong>();
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while (xmlReader.ReadToFollowing("way"))
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{
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XmlReader wayReader = xmlReader.ReadSubtree();
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HashSet<ulong> tmpList = new HashSet<ulong>();
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bool addNodes = false;
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while (wayReader.Read())
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{
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if (wayReader.IsStartElement())
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{
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if (wayReader.Name.Equals("nd"))
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{
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tmpList.Add(Convert.ToUInt64(wayReader.GetAttribute("ref")));
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}
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else if (wayReader.Name.Equals("tag"))
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{
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if (wayReader.GetAttribute("v")!.Equals("highway"))
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addNodes = true;
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}
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}
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}
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if(addNodes)
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retSet.UnionWith(tmpList);
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}
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return retSet;
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}
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private static void AddConnections(Dictionary<ulong, Node> nodes, ulong[] nodeIds,
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Dictionary<string, string> tags)
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{
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string oneWayString = tags.ContainsKey("oneway") ? tags["oneway"] : "no";
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bool oneWay = false;
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bool forward = true;
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switch (oneWayString)
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{
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case "yes":
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oneWay = true;
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break;
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case "-1":
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forward = false;
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break;
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}
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for (int i = 0; i < nodeIds.Length - 1; i++)
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{
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if (oneWay)
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{
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nodes[nodeIds[i]].AddConnection(new Connection(nodes[nodeIds[i + 1]], tags));
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nodes[nodeIds[i + 1]].AddConnection(new Connection(nodes[nodeIds[i]], tags));
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}
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else if (forward)
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{
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nodes[nodeIds[i]].AddConnection(new Connection(nodes[nodeIds[i + 1]], tags));
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}
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else
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{
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nodes[nodeIds[i + 1]].AddConnection(new Connection(nodes[nodeIds[i]], tags));
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}
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}
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}
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private static void WriteRegion(Region region, string outputFolderPath)
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{
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if (!Directory.Exists(outputFolderPath))
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Directory.CreateDirectory(outputFolderPath);
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string jsonString = JsonConvert.SerializeObject(region);
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string fileName = region.regionHash.ToString();
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File.WriteAllText(Path.Combine(outputFolderPath, fileName), jsonString);
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}
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} |