Initial commit

Server/RegionLoader.cs

@@ -0,0 +1,68 @@
+using System.Runtime.Serialization.Formatters.Binary;
+using OSMDatastructure;
+using OSMDatastructure.Graph;
+
+namespace Server;
+
+public class RegionLoader
+{
+    private string path { get; }
+    private Dictionary<ulong, Region> regionIdsDict;
+    public RegionLoader(string path)
+    {
+        this.path = path;
+        this.regionIdsDict = new();
+    }
+
+    public HashSet<OsmNode> GetNodes(ulong regionHash)
+    {
+        Region r = GetRegion(regionHash);
+        return r.nodes;
+    }
+
+    public HashSet<OsmWay> GetWays(ulong regionHash)
+    {
+        Region r = GetRegion(regionHash);
+        return r.ways;
+    }
+
+    public Region GetRegion(ulong regionHash)
+    {
+        if (regionIdsDict.ContainsKey(regionHash))
+            return regionIdsDict[regionHash];
+        else return LoadRegion(regionHash);
+    }
+
+    private Region LoadRegion(ulong regionHash)
+    {
+        Region newRegion = new Region(regionHash);
+        BinaryFormatter bFormatter = new BinaryFormatter();
+        if (regionIdsDict.ContainsKey(regionHash))
+            throw new Exception("Region already loaded");
+        if (!Directory.Exists(Path.Join(path, regionHash.ToString())))
+            throw new FileNotFoundException("Region does not exist");
+        
+#pragma warning disable SYSLIB0011
+        using (FileStream wayFileStream = new FileStream(Path.Join(path, regionHash.ToString(), RegionConverter.WaysFileName), FileMode.Open))
+        {
+            while (wayFileStream.Position < wayFileStream.Length)
+            {
+                OsmWay deserializedWay = (OsmWay)bFormatter.Deserialize(wayFileStream);
+                newRegion.ways.Add(deserializedWay);
+            }
+        }
+        
+        using (FileStream nodeFileStream = new FileStream(Path.Join(path, regionHash.ToString(), RegionConverter.NodesFileName), FileMode.Open))
+        {
+            while (nodeFileStream.Position < nodeFileStream.Length)
+            {
+                OsmNode deserializedNode = (OsmNode)bFormatter.Deserialize(nodeFileStream);
+                newRegion.nodes.Add(deserializedNode);
+            }
+        }
+#pragma warning restore SYSLIB0011
+        
+        regionIdsDict.Add(regionHash, newRegion);
+        return newRegion;
+    }
+}