Added GetNode(Coordinates coordinates)

Added GetNode(ulong id)
Instead of returning null in LoadRegion now throw an exception when file is not found.
Added some Method descriptors

OSMDatastructure/Region.cs

@@ -2,7 +2,7 @@ namespace OSMDatastructure
 {
     public class Region
     {
-        public const float regionSize = 0.01f;
+        public const float regionSize = 0.01f; //For Splitting
         private readonly Dictionary<ulong, Node> _nodesInRegion = new();
         public ulong regionHash { get; }
     
@@ -36,6 +36,16 @@ namespace OSMDatastructure
         {
             return this._nodesInRegion.ContainsKey(id) ? this._nodesInRegion[id] : null;
         }
-        
+
+        public Node? GetNode(Coordinates coordinates)
+        {
+            foreach (Node node in this._nodesInRegion.Values)
+            {
+                if (node.Equals(coordinates))
+                    return node;
+            }
+
+            return null;
+        }
     }
 }

Pathfinding/RegionManager.cs

@@ -11,16 +11,21 @@ namespace OSMImporter
         {
             this.workingDirectory = workingDirectory;
         }
-
+        
-        public Region? GetRegion(Coordinates coordinates)
+        /// <summary>
+        /// Checks wether the Region is already loaded and returns the Region, or tries to load the Region from file in workingDirectory
+        /// </summary>
+        /// <param name="coordinates">Coordinates of the Region (or within the Region) to load</param>
+        /// <returns>The Region at the specified Coordinates containing Nodes and Connections</returns>
+        /// <exception cref="FileNotFoundException">If the Regionfile can not be found.</exception>
+        public Region GetRegion(Coordinates coordinates)
         {
             if(this._regions.ContainsKey(coordinates.GetRegionHash()))
                 return this._regions[coordinates.GetRegionHash()];
             else
             {
-                Region? loadedRegion = LoadRegion(coordinates);
+                Region loadedRegion = LoadRegion(coordinates);
-                if(loadedRegion != null)
+                this._regions.Add(loadedRegion.regionHash, value: loadedRegion);
-                    this._regions.Add(loadedRegion.regionHash, value: loadedRegion);
                 return loadedRegion;
             }
         }
@@ -30,20 +35,48 @@ namespace OSMImporter
             return this._regions.Values.ToArray();
         }
         
-        private Region? LoadRegion(Coordinates coordinates)
+        /// <summary>
+        /// 
+        /// </summary>
+        /// <param name="coordinates">Coordinates of the Region (or within the Region) to load</param>
+        /// <returns>The Region at the specified Coordinates containing Nodes and Connections</returns>
+        /// <exception cref="FileNotFoundException">If the Regionfile can not be found.</exception>
+        private Region LoadRegion(Coordinates coordinates)
         {
             string fullPath = Path.Combine(workingDirectory, coordinates.GetRegionHash().ToString());
             Console.WriteLine(fullPath);
             if (!File.Exists(fullPath))
-                return null;
+            {
+                throw new FileNotFoundException(string.Format("Region does not exist: {0}", fullPath));
+            }
             
             FileStream fileStream = new FileStream(fullPath, FileMode.Open);
 
             byte[] regionBytes = new byte[fileStream.Length];
-            fileStream.Read(regionBytes, 0, regionBytes.Length);
+            int _ = fileStream.Read(regionBytes, 0, regionBytes.Length);
             fileStream.Close();
 
             return ByteConverter.ToRegion(regionBytes);
         }
+
+        public Node? GetNode(ulong id)
+        {
+            foreach (Region region in this._regions.Values)
+            {
+                Node? node = region.GetNode(id);
+                if (node != null)
+                    return node;
+            }
+
+            return null;
+        }
+
+        public Node? GetNode(Coordinates coordinates)
+        {
+            Region? regionWithNode = GetRegion(coordinates);
+            if (regionWithNode == null)
+                return null;//TODO null handling
+            return regionWithNode.GetNode(coordinates);
+        }
     }
 }