Fix closing issues

src/main/java/com/volmit/iris/util/io/InstanceState.java

@@ -0,0 +1,53 @@
+/*
+ * Iris is a World Generator for Minecraft Bukkit Servers
+ * Copyright (c) 2021 Arcane Arts (Volmit Software)
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program.  If not, see <https://www.gnu.org/licenses/>.
+ */
+
+package com.volmit.iris.util.io;
+
+import com.volmit.iris.util.math.RNG;
+
+import java.io.File;
+import java.io.IOException;
+
+public class InstanceState {
+    public static int getInstanceId()
+    {
+        try {
+            return Integer.parseInt(IO.readAll(instanceFile()).trim());
+        } catch (Throwable e) {
+            e.printStackTrace();
+        }
+
+        return -1;
+    }
+
+    public static void updateInstanceId()
+    {
+        try {
+            IO.writeAll(instanceFile(), RNG.r.imax() + "");
+        } catch (IOException e) {
+            e.printStackTrace();
+        }
+    }
+
+    private static File instanceFile()
+    {
+        File f = new File("plugins/Iris/cache/instance");
+        f.getParentFile().mkdirs();
+        return f;
+    }
+}