Noticed enums can be treated as clases to an extent so added a HashSet that accociates strings with Enum fields of the Protocol.

ProtocolValidator might become redundant!

src/main/java/ch/unibas/dmi/dbis/cs108/Multiplayer/Protocol/NTtBCommands.java

@@ -1,6 +1,7 @@
 package ch.unibas.dmi.dbis.cs108.Multiplayer.Protocol;
 
 
+import java.util.HashMap;
 
 public enum NTtBCommands {
     /**
@@ -26,5 +27,18 @@ public enum NTtBCommands {
      * MSGRS: "Message recieved": Paramaters: a string detailing to the client that and what the server recieved as command.
      */
     //Server Responses
-    MSGRS,
+    MSGRS;
+
+    //Allowes to associate strings with the enum objects. the enum fields are easier for switch statements.
+    private HashMap<String,NTtBCommands> stringNTtBCommandsHashMap = new HashMap<>();
+
+    private NTtBCommands(){
+        for(NTtBCommands cmd : NTtBCommands.values()){
+            stringNTtBCommandsHashMap.put(cmd.name(), cmd);
+        }
+    }
+
+    public boolean isLegal(String s){
+        return false;
+    }
 }

src/main/java/ch/unibas/dmi/dbis/cs108/Multiplayer/Protocol/ProtocolValidator.java

@@ -1,4 +1,23 @@
 package ch.unibas.dmi.dbis.cs108.Multiplayer.Protocol;
 
+import java.util.EnumSet;
+import java.util.HashSet;
+//TODO Possibly redundant!!
+
 public class ProtocolValidator {
+
+    //TODO String or NTtBCommands HashSet?
+    public static HashSet<NTtBCommands> legalCommands = initializeLegalCommands();
+
+    //Initialize the legalCommands set with the protocol values.
+    private static HashSet<NTtBCommands> initializeLegalCommands(){
+        EnumSet<NTtBCommands> enumVals = EnumSet.allOf(NTtBCommands.class);
+        return new HashSet<>(enumVals);
+    }
+
+    public boolean validateCommand(String s) {
+        //TODO implement if needed
+        return false;
+    }
+
 }

src/main/java/ch/unibas/dmi/dbis/cs108/Multiplayer/Server/ClientMsgDecoder.java

@@ -1,12 +1,13 @@
 package ch.unibas.dmi.dbis.cs108.Multiplayer.Server;
 
+import ch.unibas.dmi.dbis.cs108.Multiplayer.Protocol.NTtBCommands;
 import ch.unibas.dmi.dbis.cs108.Multiplayer.Protocol.ProtocolDecoder;
 
 import java.util.List;
 import java.util.Scanner;
 
 public class ClientMsgDecoder implements ProtocolDecoder {
-
+    private NTtBCommands protocol;
 
     @Override
     public String decodeMsg(String msg) {
@@ -46,6 +47,6 @@ public class ClientMsgDecoder implements ProtocolDecoder {
      * of server agency according to client msg
      */
     private @interface serverActionBuilder {
-        //TODO implement what should happen server side
+        //TODO implement what should happen server side(vote/chat/quit etc)
     }
 }