Add project files.

NmeaConstants.cs

@@ -0,0 +1,36 @@
+using GpsClient2.Exceptions;
+using GpsClient2.NmeaMessages;
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+
+namespace GpsClient2 {
+    public static class NmeaConstants {
+        private static readonly Dictionary<string, Type> TypeDictionary = new Dictionary<string, Type>
+        {
+            {"GPGGA", typeof(GpggaMessage)},
+            {"GPRMC", typeof(GprmcMessage)},
+            {"GPVTG", typeof(GpvtgMessage)},
+            {"GPGSA", typeof(GpgsaMessage)}
+        };
+
+        /// <summary>
+        /// Returns the correct class type of the message.
+        /// </summary>
+        /// <param name="typeName">The type name given.</param>
+        /// <returns>The class type.</returns>
+        /// <exception cref="UnknownTypeException">Given if the type is unkown.</exception>
+        public static Type GetClassType(string typeName) {
+            Type result;
+            TypeDictionary.TryGetValue(typeName, out result);
+
+            if (result == null) {
+                throw new UnknownTypeException();
+            }
+
+            return result;
+        }
+    }
+}