WIP. Probably need to cherry pick stuff out of here.

Added ClientConnection and server-side handshake.
Added MessageSerialiser and Deserialiser.
#story[1095]

racevisionGame/src/main/java/mock/enums/ConnectionStateEnum.java

@@ -0,0 +1,84 @@
+package mock.enums;
+
+import java.util.HashMap;
+import java.util.Map;
+
+/**
+ * The states in which a connection to a client may have.
+ */
+public enum ConnectionStateEnum {
+
+    UNKNOWN(0),
+
+    /**
+     * We're waiting for the client to complete the joining handshake (see {@link network.Messages.RequestToJoin}.
+     */
+    WAITING_FOR_HANDSHAKE(1),
+
+    /**
+     * The client has completed the handshake, and is connected.
+     */
+    CONNECTED(2),
+
+    /**
+     * The client has timed out.
+     */
+    TIMED_OUT(3);
+
+
+
+
+    private byte value;
+
+    /**
+     * Ctor. Creates a ConnectionStateEnum from a given primitive integer value, cast to a byte.
+     * @param value Integer, which is cast to byte, to construct from.
+     */
+    private ConnectionStateEnum(int value) {
+        this.value = (byte) value;
+    }
+
+    /**
+     * Returns the primitive value of the enum.
+     * @return Primitive value of the enum.
+     */
+    public byte getValue() {
+        return value;
+    }
+
+
+    /**
+     * Stores a mapping between Byte values and ConnectionStateEnum values.
+     */
+    private static final Map<Byte, ConnectionStateEnum> byteToStatusMap = new HashMap<>();
+
+
+    /*
+      Static initialization block. Initializes the byteToStatusMap.
+     */
+    static {
+        for (ConnectionStateEnum type : ConnectionStateEnum.values()) {
+            ConnectionStateEnum.byteToStatusMap.put(type.value, type);
+        }
+    }
+
+
+    /**
+     * Returns the enumeration value which corresponds to a given byte value.
+     * @param connectionState Byte value to convert to a ConnectionStateEnum value.
+     * @return The ConnectionStateEnum value which corresponds to the given byte value.
+     */
+    public static ConnectionStateEnum fromByte(byte connectionState) {
+        //Gets the corresponding MessageType from the map.
+        ConnectionStateEnum type = ConnectionStateEnum.byteToStatusMap.get(connectionState);
+
+        if (type == null) {
+            //If the byte value wasn't found, return the UNKNOWN connectionState.
+            return ConnectionStateEnum.UNKNOWN;
+        } else {
+            //Otherwise, return the connectionState.
+            return type;
+        }
+
+    }
+}