disable continue from different major version

Author: NicholasBatesNZ

engine/src/main/java/org/destinationsol/Const.java

@@ -37,4 +37,8 @@ public class Const {
     public static final float CAM_VIEW_DIST_JOURNEY = 8.6f;
     public static final float DEFAULT_AI_SPD = 4f;
     public static final float BIG_AI_SPD = 2f;
+
+    public static final String SAVE_FILE_NAME = "prevShip.ini";
+    public static final String MERC_SAVE_FILE = "mercenaries.json";
+    public static final String WORLD_SAVE_FILE_NAME = "world.json";
 }

engine/src/main/java/org/destinationsol/game/SaveManager.java

@@ -23,6 +23,7 @@
 import com.google.gson.JsonObject;
 import com.google.gson.JsonParser;
 import com.google.gson.stream.JsonReader;
+import org.destinationsol.Const;
 import org.destinationsol.IniReader;
 import org.destinationsol.common.SolRandom;
 import org.destinationsol.files.HullConfigManager;
@@ -47,9 +48,6 @@
 import java.util.List;
 
 public class SaveManager {
-    protected static final String SAVE_FILE_NAME = "prevShip.ini";
-    protected static final String MERC_SAVE_FILE = "mercenaries.json";
-    protected static final String WORLD_SAVE_FILE_NAME = "world.json";
 
     private static Logger logger = LoggerFactory.getLogger(SaveManager.class);
 
@@ -66,7 +64,8 @@ public static void writeShips(HullConfig hull, float money, List<SolItem> itemsL
 
         String waypoints = waypointsToString(hero.getWaypoints());
 
-        IniReader.write(SAVE_FILE_NAME, "hull", hullName, "money", (int) money, "items", items, "x", pos.x, "y", pos.y, "waypoints", waypoints);
+        IniReader.write(Const.SAVE_FILE_NAME, "hull", hullName, "money", (int) money, "items", items,
+                "x", pos.x, "y", pos.y, "waypoints", waypoints, "version", Const.VERSION);
     }
 
     private static String waypointsToString(ArrayList<Waypoint> waypoints) {
@@ -156,7 +155,7 @@ private static void writeMercs(Hero hero, HullConfigManager hullConfigManager) {
         // Using PrintWriter because it truncates the file if it exists or creates a new one if it doesn't
         // And truncation is good because we don't want dead mercs respawning
         try {
-            writer = new PrintWriter(getResourcePath(MERC_SAVE_FILE), "UTF-8");
+            writer = new PrintWriter(getResourcePath(Const.MERC_SAVE_FILE), "UTF-8");
             writer.write(stringToWrite);
             writer.close();
         } catch (FileNotFoundException | UnsupportedEncodingException e) {
@@ -199,7 +198,7 @@ public static boolean hasPrevShip(String fileName) {
      * Load last saved ship from file
      */
     public static ShipConfig readShip(HullConfigManager hullConfigs, ItemManager itemManager) {
-        IniReader ir = new IniReader(SAVE_FILE_NAME, null);
+        IniReader ir = new IniReader(Const.SAVE_FILE_NAME, null);
 
         String hullName = ir.getString("hull", null);
         if (hullName == null) {
@@ -229,7 +228,7 @@ public static ShipConfig readShip(HullConfigManager hullConfigs, ItemManager ite
      */
     public static void saveWorld(int numberOfSystems) {
         Long seed = SolRandom.getSeed();
-        String fileName = SaveManager.getResourcePath(WORLD_SAVE_FILE_NAME);
+        String fileName = SaveManager.getResourcePath(Const.WORLD_SAVE_FILE_NAME);
 
         JsonObject world = new JsonObject();
         world.addProperty("seed", seed);
@@ -257,11 +256,11 @@ public static void saveWorld(int numberOfSystems) {
      * Load the last saved world from file, or returns null if there is no file
      */
     public static WorldConfig loadWorld() {
-        if (SaveManager.resourceExists(WORLD_SAVE_FILE_NAME)) {
+        if (SaveManager.resourceExists(Const.WORLD_SAVE_FILE_NAME)) {
             WorldConfig config = new WorldConfig();
             JsonReader reader = null;
             try {
-                reader = new com.google.gson.stream.JsonReader(new FileReader(SaveManager.getResourcePath(WORLD_SAVE_FILE_NAME)));
+                reader = new com.google.gson.stream.JsonReader(new FileReader(SaveManager.getResourcePath(Const.WORLD_SAVE_FILE_NAME)));
                 reader.setLenient(true); // without this it will fail with strange errors
                 JsonObject world = new JsonParser().parse(reader).getAsJsonObject();
 

engine/src/main/java/org/destinationsol/menu/NewGameScreen.java

@@ -18,7 +18,9 @@
 
 import com.badlogic.gdx.graphics.Texture;
 import com.badlogic.gdx.graphics.g2d.TextureAtlas;
+import org.destinationsol.Const;
 import org.destinationsol.GameOptions;
+import org.destinationsol.IniReader;
 import org.destinationsol.SolApplication;
 import org.destinationsol.assets.Assets;
 import org.destinationsol.common.SolColor;
@@ -58,7 +60,10 @@ public class NewGameScreen extends SolUiBaseScreen {
 
     @Override
     public void onAdd(SolApplication solApplication) {
-        continueControl.setEnabled(SaveManager.hasPrevShip("prevShip.ini"));
+        IniReader reader = new IniReader(Const.SAVE_FILE_NAME, null);
+        String saveMajorVersion = reader.getString("version", "").split("\\.")[0];
+        String gameMajorVersion = Const.VERSION.split("\\.")[0];
+        continueControl.setEnabled(SaveManager.hasPrevShip("prevShip.ini") && saveMajorVersion.equals(gameMajorVersion));
     }
 
     @Override