src/main/java/ch/unibas/dmi/dbis/cs108/casono/server/app/commands/add_player/AddPlayerHandler.java

@@ -0,0 +1,33 @@
+package ch.unibas.dmi.dbis.cs108.casono.server.app.commands.add_player;
+
+import ch.unibas.dmi.dbis.cs108.casono.server.domain.user.User;
+import ch.unibas.dmi.dbis.cs108.casono.server.domain.user.UserRegistry;
+import ch.unibas.dmi.dbis.cs108.casono.server.network.command.execution.CommandHandler;
+import ch.unibas.dmi.dbis.cs108.casono.server.network.protocol.response.ErrorResponse;
+import ch.unibas.dmi.dbis.cs108.casono.server.network.protocol.response.OkResponse;
+import ch.unibas.dmi.dbis.cs108.casono.server.network.protocol.response.dispatcher.ResponseDispatcher;
+import java.util.Optional;
+
+/** Handler for the ADD_PLAYER command. */
+public class AddPlayerHandler extends CommandHandler<AddPlayerRequest> {
+    private final UserRegistry userRegistry;
+
+    public AddPlayerHandler(UserRegistry userRegistry, ResponseDispatcher responseDispatcher) {
+        super(responseDispatcher);
+        this.userRegistry = userRegistry;
+    }
+
+    @Override
+    public void execute(AddPlayerRequest request) {
+        Optional<User> created =
+                userRegistry.registerIfAvailable(
+                        request.getName(), request.getContext().sessionId());
+        if (created.isEmpty()) {
+            responseDispatcher.dispatch(
+                    new ErrorResponse(request.getContext(), "NAME_TAKEN", "Name already taken"));
+            return;
+        }
+
+        responseDispatcher.dispatch(new OkResponse(request.getContext()));
+    }
+}

src/main/java/ch/unibas/dmi/dbis/cs108/casono/server/app/commands/add_player/AddPlayerParser.java

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+package ch.unibas.dmi.dbis.cs108.casono.server.app.commands.add_player;
+
+import ch.unibas.dmi.dbis.cs108.casono.server.network.command.parsing.CommandParser;
+import ch.unibas.dmi.dbis.cs108.casono.server.network.protocol.request.PrimitiveRequest;
+import ch.unibas.dmi.dbis.cs108.casono.server.network.protocol.request.accessor.RequestParameterAccessor;
+
+/** Parser for the ADD_PLAYER command. */
+public class AddPlayerParser implements CommandParser<AddPlayerRequest> {
+    @Override
+    public AddPlayerRequest parse(PrimitiveRequest primitiveRequest) {
+        RequestParameterAccessor accessor =
+                new RequestParameterAccessor(primitiveRequest.parameters());
+
+        String name = accessor.require("NAME");
+
+        int chips = accessor.require("CHIPS", Integer::parseInt);
+
+        return new AddPlayerRequest(primitiveRequest.context(), name, chips);
+    }
+}

src/main/java/ch/unibas/dmi/dbis/cs108/casono/server/app/commands/add_player/AddPlayerRequest.java

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+package ch.unibas.dmi.dbis.cs108.casono.server.app.commands.add_player;
+
+import ch.unibas.dmi.dbis.cs108.casono.server.network.protocol.request.Request;
+import ch.unibas.dmi.dbis.cs108.casono.server.network.protocol.request.RequestContext;
+
+/** Request data for the ADD_PLAYER command. */
+public class AddPlayerRequest extends Request {
+    private final String name;
+    private final int chips;
+
+    public AddPlayerRequest(RequestContext context, String name, int chips) {
+        super(context);
+        this.name = name;
+        this.chips = chips;
+    }
+
+    public String getName() {
+        return name;
+    }
+
+    public int getChips() {
+        return chips;
+    }
+}