Beginning of Import

Server/RegionConverter.cs

@@ -0,0 +1,73 @@
+using System.Globalization;
+using System.Xml;
+using OSMDatastructure;
+
+namespace Server;
+
+public class RegionConverter
+{
+    private static readonly XmlReaderSettings ReaderSettings = new()
+    {
+        IgnoreWhitespace = true,
+        IgnoreComments = true
+    };
+    private static readonly NumberFormatInfo decimalInfo = new()
+    {
+        NumberDecimalSeparator = "."
+    };
+    
+    public static HashSet<Region> ImportXml(string filePath)
+    {
+        if (!File.Exists(filePath))
+            throw new FileNotFoundException();
+        
+        Console.WriteLine("Getting highwayNodeIds...");
+        FileStream xmlFileStream = new FileStream(filePath, FileMode.Open);
+        Dictionary<ulong, ulong> nodeIdRegionDict = GetNodesAndRegions(XmlReader.Create(xmlFileStream, ReaderSettings));
+        xmlFileStream.Position = 0;
+
+        Console.WriteLine("Importing Nodes...");
+        Dictionary<ulong, OsmNode> nodes =
+            GetHighwayNodesFromIds(XmlReader.Create(xmlFileStream, ReaderSettings), requiredNodeIds);
+        requiredNodeIds.Clear();
+        xmlFileStream.Position = 0;
+        
+        Console.WriteLine("Importing Ways...");
+        HashSet<OsmNode> retNodes = ConnectNodes(XmlReader.Create(xmlFileStream, ReaderSettings), nodes);
+        nodes.Clear();
+
+        return retNodes;
+    }
+
+    private static Dictionary<ulong, ulong> GetNodesAndRegions(XmlReader xmlReader)
+    {
+        bool isHighway = false;
+        while (xmlReader.ReadToFollowing("way"))
+        {
+            isHighway = false;
+            currentIds.Clear();
+            XmlReader wayReader = xmlReader.ReadSubtree();
+            while (wayReader.Read())
+            {
+                if (xmlReader.Name == "tag" && xmlReader.GetAttribute("k")!.Equals("highway"))
+                {
+                    isHighway = true;
+                }
+                else if (xmlReader.Name == "nd")
+                {
+                    try
+                    {
+                        currentIds.Add(Convert.ToUInt64(xmlReader.GetAttribute("ref")));
+                    }
+                    catch (FormatException) { };
+                }
+            }
+            if (isHighway)
+            {
+                retSet.UnionWith(currentIds);
+            }
+            wayReader.Close();
+        }
+        xmlReader.Close();
+    }
+}