feat: implemented proper MessageDeserialization

src/main/java/uulm/teamname/marvelous/gamelibrary/json/login/EventMessageDeserializer.java

@@ -0,0 +1,32 @@
+package uulm.teamname.marvelous.gamelibrary.json.login;
+
+import com.fasterxml.jackson.core.JsonParser;
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.core.TreeNode;
+import com.fasterxml.jackson.databind.DeserializationContext;
+import com.fasterxml.jackson.databind.JsonDeserializer;
+import com.fasterxml.jackson.databind.JsonNode;
+import uulm.teamname.marvelous.gamelibrary.messages.BasicMessage;
+import uulm.teamname.marvelous.gamelibrary.messages.EventMessage;
+import uulm.teamname.marvelous.gamelibrary.messages.MessageType;
+import uulm.teamname.marvelous.gamelibrary.messages.RequestMessage;
+
+import java.io.IOException;
+
+public class EventMessageDeserializer extends JsonDeserializer<BasicMessage> {
+
+    @Override
+    public BasicMessage deserialize(JsonParser p, DeserializationContext ctxt) throws IOException, JsonProcessingException {
+        JsonNode node = p.readValueAsTree();
+
+        JsonNode subNode;
+        if ((subNode = node.get("messageType")) != null) {
+            if (MessageType.valueOf(subNode.textValue()) == MessageType.EVENTS) {
+                return p.getCodec().treeToValue(node, EventMessage.class);
+            } else if (MessageType.valueOf(subNode.textValue()) == MessageType.REQUESTS) {
+                return p.getCodec().treeToValue(node, RequestMessage.class);
+            }
+        }
+        throw new IllegalStateException("EventMessage is actually not an EventMessage");
+    }
+}

src/main/java/uulm/teamname/marvelous/gamelibrary/messages/BasicMessage.java

@@ -1,10 +1,34 @@
 package uulm.teamname.marvelous.gamelibrary.messages;
 
+import com.fasterxml.jackson.annotation.JsonSubTypes;
+import com.fasterxml.jackson.annotation.JsonSubTypes.Type;
+import com.fasterxml.jackson.annotation.JsonTypeInfo;
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
+import uulm.teamname.marvelous.gamelibrary.json.login.MessageDeserializer;
+
+import java.util.Objects;
+
 /**
  * The basic message from the standard, containing all possible expansion keys. In other words, one needs to check the
- * messageType, as fields that aren't sent are null. Note that ingame messages are not deserialized into the {@link
- * BasicMessage}, but instead into the {@link EventMessage}.
+ * messageType, as fields that aren't sent are null. Note that most messages are not deserialized into the {@link
+ * BasicMessage}, but instead into messages such as the {@link EventMessage} or {@link GameAssignmentMessage}.
  */
+@JsonTypeInfo(use = JsonTypeInfo.Id.DEDUCTION, defaultImpl = BasicMessage.class)
+@JsonSubTypes({
+        @Type(HelloClientMessage.class),
+        @Type(HelloServerMessage.class),
+        @Type(ErrorMessage.class),
+        @Type(PlayerReadyMessage.class),
+        @Type(ReconnectMessage.class),
+        @Type(GameAssignmentMessage.class),
+        @Type(GeneralAssignmentMessage.class),
+        @Type(CharacterSelectionMessage.class),
+        @Type(ConfirmSelectionMessage.class),
+        @Type(GameStructureMessage.class),
+        @Type(EventMessage.class),
+        // @Type(RequestMessage.class), There's a custom deserializer in EventMessage for this
+        @Type(GoodbyeClientMessage.class)
+})
 public class BasicMessage {
 
     /** The messageType describes the type of message that might be sent */
@@ -13,15 +37,25 @@ public class BasicMessage {
     /** I have no idea what this might be used for, even less the boolean in the answer */
     public String optionals;
 
-    /**
-     * <b>Exists only in a HelloClient message.</b>
-     * Describes whether the user was in a running game before reconnecting.
-     */
-    public Boolean runningGame;
+    @Override
+    public boolean equals(Object o) {
+        if (this == o) return true;
+        if (o == null || getClass() != o.getClass()) return false;
+        BasicMessage that = (BasicMessage) o;
+        return messageType == that.messageType && Objects.equals(optionals, that.optionals);
+    }
 
-    /**
-     * <b>Exists only in GameAssignment and GeneralAssignment messages.</b>
-     * Used for notifying the player of which party they have been assigned to
-     */
-    public String gameID;
+    @Override
+    public int hashCode() {
+        return Objects.hash(messageType, optionals);
+    }
+
+    @Override
+    public String toString() {
+        return "BasicMessage{" +
+                "messageType=" + messageType +
+                ", optionals='" + optionals + '\'' +
+                '}';
+    }
 }
+// @JsonDeserialize(using = MessageDeserializer.class)

src/main/java/uulm/teamname/marvelous/gamelibrary/messages/EventMessage.java

@@ -1,13 +1,16 @@
 package uulm.teamname.marvelous.gamelibrary.messages;
 
 import com.fasterxml.jackson.annotation.JsonIgnore;
+import com.fasterxml.jackson.databind.annotation.JsonDeserialize;
 import uulm.teamname.marvelous.gamelibrary.events.Event;
+import uulm.teamname.marvelous.gamelibrary.json.login.EventMessageDeserializer;
 
 import java.util.Arrays;
 import java.util.HashMap;
 import java.util.Objects;
 
 /** Represents a message sent between client and server and contains all possible data. */
+@JsonDeserialize(using = EventMessageDeserializer.class)
 public class EventMessage extends BasicMessage {
 
     /** The list of {@link Event Events} sent inside the message. */