feat: characterConfig now has a HashMap for values

src/main/java/uulm/teamname/marvelous/gamelibrary/json/config/CharacterConfig.java

@@ -1,8 +1,34 @@
 package uulm.teamname.marvelous.gamelibrary.json.config;
 
+import com.fasterxml.jackson.annotation.JsonIgnore;
+
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.Map;
+
 /**
  * POJO describing the CharacterConfig as defined by the standard document.
  */
 public class CharacterConfig {
     public CharacterProperties[] characters;
+
+    @JsonIgnore private Map<String, CharacterProperties> propertyMap;
+    @JsonIgnore private Map<String, CharacterProperties> unmodifiablePropertyMap;
+
+    /**
+     * @return a unmodifiable {@link Map}<{@link String}, {@link CharacterProperties}> containing all properties.
+     * If not yet existent, initialize the Map
+     */
+    public Map<String, CharacterProperties> getMap() {
+        // lazy initialization
+        if (propertyMap == null) {
+            propertyMap = new HashMap<>();
+            for (CharacterProperties property: characters) {
+                propertyMap.put(property.name, property);
+            }
+            unmodifiablePropertyMap = Collections.unmodifiableMap(propertyMap);
+        }
+
+        return unmodifiablePropertyMap;
+    }
 }