The API now test if the object were deleted before adding.

src/main/java/xyz/alexcrea/cuanvil/api/ConflictAPI.java

@@ -30,13 +30,28 @@ public class ConflictAPI {
      * @return True if successful.
      */
     public static boolean addConflict(@NotNull ConflictBuilder builder){
+        return addConflict(builder, false);
+    }
+
+    /**
+     * Write and add a conflict.
+     * Will not write the conflict if it already exists.
+     *
+     * @param builder The conflict builder to be based on
+     * @param overrideDeleted If we should write even if the conflict was previously deleted.
+     * @return True if successful.
+     */
+    public static boolean addConflict(@NotNull ConflictBuilder builder, boolean overrideDeleted){
         FileConfiguration config = ConfigHolder.CONFLICT_HOLDER.getConfig();
+
+        // Test if conflict can be added
+        if(!overrideDeleted && ConfigHolder.CONFLICT_HOLDER.isDeleted(builder.getName())) return false;
         if(config.contains(builder.getName())) return false;
 
         if(!writeConflict(builder, false)) return false;
 
-        EnchantConflictGroup conflict = builder.build();
 
+        EnchantConflictGroup conflict = builder.build();
         // Register conflict
         ConfigHolder.CONFLICT_HOLDER.getConflictManager().addConflict(conflict);
 

src/main/java/xyz/alexcrea/cuanvil/api/CustomAnvilRecipeApi.java

@@ -29,10 +29,24 @@ public class CustomAnvilRecipeApi {
      * @return True if successful.
      */
     public static boolean addRecipe(@NotNull AnvilRecipeBuilder builder){
+        return addRecipe(builder, false);
+    }
+
+    /**
+     * Write and add a custom anvil recipe.
+     * Will not write the recipe if it already exists.
+     *
+     * @param builder The recipe builder to be based on
+     * @param overrideDeleted If we should write even if the recipe was previously deleted.
+     * @return True if successful.
+     */
+    public static boolean addRecipe(@NotNull AnvilRecipeBuilder builder, boolean overrideDeleted){
         FileConfiguration config = ConfigHolder.CUSTOM_RECIPE_HOLDER.getConfig();
         String name = builder.getName();
 
+        if(!overrideDeleted && ConfigHolder.CUSTOM_RECIPE_HOLDER.isDeleted(builder.getName())) return false;
         if(config.contains(builder.getName())) return false;
+
         if(builder.getName().contains(".")) {
             CustomAnvil.instance.getLogger().warning("Custom anvil recipe " + name + " contain \".\" in its name but should not. this recipe is ignored.");
             return false;

src/main/java/xyz/alexcrea/cuanvil/api/MaterialGroupApi.java

@@ -27,16 +27,34 @@ public class MaterialGroupApi {
     private static int saveChangeTask = -1;
     private static int reloadChangeTask = -1;
 
+
     /**
      * Write and add a group.
      * Will not write the group if it already exists.
      *
-     * @param group the group to add
+     * @param group The group to add
      * @return true if successful.
      */
     public static boolean addMaterialGroup(@NotNull AbstractMaterialGroup group){
+        return addMaterialGroup(group, false);
+    }
+
+    /**
+     * Write and add a group.
+     * Will not write the group if it already exists.
+     *
+     * @param group The group to add
+     * @param overrideDeleted If we should write even if the group was previously deleted.
+     * @return true if successful.
+     */
+    public static boolean addMaterialGroup(@NotNull AbstractMaterialGroup group, boolean overrideDeleted){
         ItemGroupManager itemGroupManager = ConfigHolder.ITEM_GROUP_HOLDER.getItemGroupsManager();
+
+        // Test if it exists/existed
+        if(!overrideDeleted && ConfigHolder.ITEM_GROUP_HOLDER.isDeleted(group.getName())) return false;
         if(itemGroupManager.get(group.getName()) != null) return false;
+
+        // Add group
         itemGroupManager.getGroupMap().put(group.getName(), group);
 
         if(!writeMaterialGroup(group, false)) return false;

src/main/java/xyz/alexcrea/cuanvil/config/ConfigHolder.java

@@ -245,7 +245,7 @@ public abstract class ConfigHolder {
          * @param objectPath The object path to delete.
          * @return True if successful.
          */
-        private boolean wasDeleted(String objectPath){
+        public boolean isDeleted(String objectPath){
             if(this.deletedListConfig == null) return false;
 
             return this.deletedListConfig.getBoolean(objectPath, false);