Allow querying level count in loader

Assets/Scripts/GameMaster.cs

@@ -13,6 +13,7 @@ public class GameMaster : MonoBehaviour {
     // Use this for initialization
     void Start () {
         levelLoader = new DeserializedLevelsLoader();
+        levelLoader.load();
     }
 
     public void loadLevel(int numberOfPlayers, int level = -1)

Assets/Scripts/LevelManagement/DeserializedLevelsLoader.cs

@@ -7,9 +7,7 @@ using UnityEngine;
 public class DeserializedLevelsLoader
 {
   // Levels deserialized
-  private DeserializedLevels deserializedLevels;
-
-  private int currentLevelIndex = 0;
+  private DeserializedLevels deserializedLevels = null;
 
   private const string prefabsFolder = "Prefabs/";
 
@@ -33,8 +31,27 @@ public class DeserializedLevelsLoader
 
   public const string xmlItemsGOName = "XmlItems";
 
+  public void load ()
+  {
+    deserializedLevels = XmlIO.LoadXml<DeserializedLevels>("Levels");
+  }
+
+  public int getLevelCount ()
+  {
+    if (deserializedLevels == null)
+      throw new System.InvalidOperationException();
+
+    return deserializedLevels.levels.Length;
+  }
+
   public void loadLevel (int levelIndex = 0)
   {
+    if (deserializedLevels == null)
+      throw new System.InvalidOperationException();
+
+    if (levelIndex >= deserializedLevels.levels.Length)
+      throw new System.ArgumentException();
+
     prefabPool = new Dictionary<string, GameObject>();
     sceneItemsList = new List<ItemStruct>();
 
@@ -44,14 +61,7 @@ public class DeserializedLevelsLoader
 
     parentOfXmlItems = new GameObject(xmlItemsGOName).transform;
 
-    deserializedLevels = XmlIO.LoadXml<DeserializedLevels>("Levels");
-
-    // if startlevel is in the XML i.e. <Developer StartLevel="3" /> then get level from there
-    // otherwise start with level 1
-    currentLevelIndex = (levelIndex > deserializedLevels.levels.Length - 1) ? 0 : levelIndex;
-
-
-    DeserializedLevels.Level currentLevel = deserializedLevels.levels[currentLevelIndex];
+    DeserializedLevels.Level currentLevel = deserializedLevels.levels[levelIndex];
     sceneItemsList.Clear();