src/main/java/ch/unibas/dmi/dbis/cs108/casono/server/network/response/ErrorResponse.java

@@ -0,0 +1,32 @@
+package ch.unibas.dmi.dbis.cs108.casono.server.network.response;
+
+import ch.unibas.dmi.dbis.cs108.casono.server.network.sessions.SessionId;
+
+public class ErrorResponse extends Response {
+    private final String code;
+    private final String message;
+
+    public ErrorResponse(
+            SessionId sessionId, int requestId, String errorCode, String errorMessage) {
+        this.sessionId = sessionId;
+        this.requestId = requestId;
+        this.code = errorCode;
+        this.message = errorMessage;
+    }
+
+    public ErrorResponse(SessionId sessionId, int requestId, String errorCode) {
+        this.sessionId = sessionId;
+        this.requestId = requestId;
+        this.code = errorCode;
+        this.message = null;
+    }
+
+    @Override
+    public String encode() {
+        if (message != null && !message.isEmpty()) {
+            return "-ERR CODE=" + code + " MSG=" + message;
+        } else {
+            return "-ERR CODE=" + code;
+        }
+    }
+}

src/main/java/ch/unibas/dmi/dbis/cs108/casono/server/network/response/Response.java

@@ -0,0 +1,16 @@
+package ch.unibas.dmi.dbis.cs108.casono.server.network.response;
+
+import ch.unibas.dmi.dbis.cs108.casono.server.network.sessions.SessionId;
+
+public abstract class Response implements Encodable {
+    protected SessionId sessionId;
+    protected int requestId;
+
+    public SessionId getSessionId() {
+        return sessionId;
+    }
+
+    public int getRequestId() {
+        return requestId;
+    }
+}

src/main/java/ch/unibas/dmi/dbis/cs108/casono/server/network/response/SuccessResponse.java

@@ -0,0 +1,23 @@
+package ch.unibas.dmi.dbis.cs108.casono.server.network.response;
+
+import ch.unibas.dmi.dbis.cs108.casono.server.network.sessions.SessionId;
+
+public abstract class SuccessResponse extends Response {
+    public SuccessResponse(SessionId sessionId, int requestId) {
+        this.sessionId = sessionId;
+        this.requestId = requestId;
+    }
+
+    public final String encode() {
+        String payload = payload();
+        if (payload.isBlank()) {
+            return "+OK";
+        } else {
+            return "+OK " + payload;
+        }
+    }
+
+    protected String payload() {
+        return "";
+    }
+}