feat: created proper JSON deserializer and created test for JSON, which is still used for TDD

src/main/java/uulm/teamname/marvelous/gamelibrary/json/ingame/EventDeserializer.java

@@ -1,2 +1,68 @@
-package uulm.teamname.marvelous.gamelibrary.json.ingame;public class EventDeserializer {
+package uulm.teamname.marvelous.gamelibrary.json.ingame;
+
+import com.fasterxml.jackson.core.JsonParser;
+import com.fasterxml.jackson.core.JsonProcessingException;
+import com.fasterxml.jackson.core.ObjectCodec;
+import com.fasterxml.jackson.databind.DeserializationContext;
+import com.fasterxml.jackson.databind.JsonDeserializer;
+import com.fasterxml.jackson.databind.JsonNode;
+import com.fasterxml.jackson.databind.ObjectMapper;
+import uulm.teamname.marvelous.gamelibrary.entities.Entity;
+import uulm.teamname.marvelous.gamelibrary.entities.EntityID;
+import uulm.teamname.marvelous.gamelibrary.events.Event;
+import uulm.teamname.marvelous.gamelibrary.events.EventType;
+import uulm.teamname.marvelous.gamelibrary.events.GamestateEvent;
+
+import java.io.IOException;
+
+public class EventDeserializer extends JsonDeserializer<Event> {
+
+    private final ObjectMapper mapper = new ObjectMapper();
+
+    @Override
+    public Event deserialize(JsonParser p, DeserializationContext ctxt) throws IOException, JsonProcessingException {
+        ObjectCodec codec = p.getCodec();
+        JsonNode node = codec.readTree(p);
+
+        JsonNode currentNode = null;
+
+        Event result = null;
+        EventType eventType = null;
+
+        if (!node.has("eventType")) {
+            throw new IOException("Event had wrong format: no EventType found");
+        } else {
+            eventType = EventType.valueOf(node.get("eventType").asText());
+
+            switch (eventType) {
+                case Ack:
+                case Nack:
+                case GamestateEvent:
+                    result = new GamestateEvent();
+                    result.type = eventType;
+
+                    if ((currentNode = node.get("activeCharacter")) != null) {
+                        ((GamestateEvent) result).activeCharacter = mapper
+                                .readValue(currentNode.toString(), EntityID.class);
+                    }
+
+                    if ((currentNode = node.get("turnOrder")) != null) {
+                        ((GamestateEvent) result).turnOrder = mapper
+                                .readValue(currentNode.toString(), EntityID[].class);
+                    }
+
+
+//                    currentNode = node.get("entities");
+//                    ((GameStateEvent) result).entities = currentNode == null
+//                            ? null
+//                            : mapper.readValue(currentNode.asText(), Entity[].class);
+//
+//                    currentNode = node.get("turnOrder");
+//                    ((GameStateEvent) result).turnOrder = currentNode == null
+//                            ? null
+//                            : mapper.readValue(currentNode.asText(), EntityID[].class);
+            }
+        }
+        return result;
+    }
 }