Split TNTRandomRangeValidator into two validators

src/main/java/carpet/settings/CarpetSettings.java

@@ -89,24 +89,30 @@ public class CarpetSettings
     @Rule( desc = "TNT causes less lag when exploding in the same spot and in liquids", category = TNT)
     public static boolean optimizedTNT = false;
 
+    private static class CheckOptimizedTntEnabledValidator<T> extends Validator<T> {
+        @Override
+        public T validate(ServerCommandSource source, ParsedRule<T> currentRule, T newValue, String string) {
+            return optimizedTNT || currentRule.defaultValue.equals(newValue) ? newValue : null;
+        }
+
+        @Override
+        public String description() {
+            return "optimizedTNT must be enabled";
+        }
+    }
+
     @Rule( desc = "Sets the tnt random explosion range to a fixed value", category = TNT, options = "-1",
-            validate = TNTRandomRangeValidator.class, extra = "Set to -1 for default behavior")
+            validate = {CheckOptimizedTntEnabledValidator.class, TNTRandomRangeValidator.class}, extra = "Set to -1 for default behavior")
     public static double tntRandomRange = -1;
 
     private static class TNTRandomRangeValidator extends Validator<Double> {
         @Override
         public Double validate(ServerCommandSource source, ParsedRule<Double> currentRule, Double newValue, String string) {
-            if (newValue == -1)
-                return newValue;
-            if (!optimizedTNT)
-                return null;
-            return newValue >= 0 ? newValue : null;
+            return newValue == -1 || newValue >= 0 ? newValue : null;
         }
 
         @Override
         public String description() {
-            if (!optimizedTNT)
-                return "Requires optimizedTNT to be enabled";
             return "Cannot be negative, except for -1";
         }
     }