From e36f3a1694fc9cc03bd03b57d06cb44a9700761a Mon Sep 17 00:00:00 2001
From: alexcrea <42614139+alexcrea@users.noreply.github.com>
Date: Fri, 25 Oct 2024 17:04:19 +0200
Subject: [PATCH] Optimized list gui mapped to gui initialisation

---
 .../alexcrea/cuanvil/api/UnitRepairApi.java   | 14 +++---
 .../config/global/CustomRecipeConfigGui.java  | 19 ++++----
 .../gui/config/global/EnchantConflictGui.java |  7 +--
 .../gui/config/global/GroupConfigGui.java     |  7 +--
 .../config/global/UnitRepairConfigGui.java    | 19 ++++----
 .../config/list/MappedGuiListConfigGui.java   | 46 ++++++++++++++++---
 .../config/list/UnitRepairElementListGui.java | 10 +---
 .../elements/CustomRecipeSubSettingGui.java   |  5 +-
 .../list/elements/ElementMappedToListGui.java |  3 --
 .../EnchantConflictSubSettingGui.java         |  6 +--
 .../elements/GroupConfigSubSettingGui.java    |  5 +-
 .../elements/MappedToListSubSettingGui.java   |  8 ----
 .../xyz/alexcrea/cuanvil/util/LazyValue.java  | 36 +++++++++++++++
 13 files changed, 119 insertions(+), 66 deletions(-)
 create mode 100644 src/main/java/xyz/alexcrea/cuanvil/util/LazyValue.java

diff --git a/src/main/java/xyz/alexcrea/cuanvil/api/UnitRepairApi.java b/src/main/java/xyz/alexcrea/cuanvil/api/UnitRepairApi.java
index d471b19..fb68448 100644
--- a/src/main/java/xyz/alexcrea/cuanvil/api/UnitRepairApi.java
+++ b/src/main/java/xyz/alexcrea/cuanvil/api/UnitRepairApi.java
@@ -9,6 +9,7 @@ import org.jetbrains.annotations.NotNull;
 import xyz.alexcrea.cuanvil.config.ConfigHolder;
 import xyz.alexcrea.cuanvil.dependency.DependencyManager;
 import xyz.alexcrea.cuanvil.gui.config.global.UnitRepairConfigGui;
+import xyz.alexcrea.cuanvil.gui.config.list.MappedGuiListConfigGui;
 import xyz.alexcrea.cuanvil.gui.config.list.UnitRepairElementListGui;
 
 import java.util.ArrayList;
@@ -94,9 +95,9 @@ public class UnitRepairApi {
         // Add to gui
         UnitRepairConfigGui repairConfigGui = UnitRepairConfigGui.getCurrentInstance();
         if(repairConfigGui != null) {
-            UnitRepairElementListGui elementGui = repairConfigGui.getInstanceOrCreate(unit);
+            UnitRepairElementListGui elementGui = repairConfigGui.getInstanceOrCreate(unit).getStored();
 
-            elementGui.updateValueForGeneric(repairableName, true);
+            if(elementGui != null) elementGui.updateValueForGeneric(repairableName, true);
             repairConfigGui.updateValueForGeneric(unit, true);
         }
 
@@ -124,14 +125,15 @@ public class UnitRepairApi {
         boolean lastValue = false;
         if(config.isConfigurationSection(unitName.toLowerCase())) {
             ConfigurationSection section = config.getConfigurationSection(unitName.toLowerCase());
-            if(section.getKeys(false).isEmpty()) {
+
+            if(section != null && section.getKeys(false).isEmpty()) {
                 lastValue = true;
                 config.set(unitName.toLowerCase(), null);
             }
 
         } else if (config.isConfigurationSection(unitName.toUpperCase())) {
             ConfigurationSection section = config.getConfigurationSection(unitName.toUpperCase());
-            if(section.getKeys(false).isEmpty()) {
+            if(section != null && section.getKeys(false).isEmpty()) {
                 lastValue = true;
                 config.set(unitName.toUpperCase(), null);
             }
@@ -146,9 +148,9 @@ public class UnitRepairApi {
         // Remove from gui
         UnitRepairConfigGui repairConfigGui = UnitRepairConfigGui.getCurrentInstance();
         if(repairConfigGui != null) {
-            UnitRepairElementListGui elementGui = repairConfigGui.getInstanceOrCreate(unit);
+            UnitRepairElementListGui elementGui = repairConfigGui.getInstanceOrCreate(unit).getStored();
 
-            elementGui.removeGeneric(repairableName);
+            if(elementGui != null) elementGui.removeGeneric(repairableName);
             if(lastValue){
                 repairConfigGui.removeGeneric(unit);
             }
diff --git a/src/main/java/xyz/alexcrea/cuanvil/gui/config/global/CustomRecipeConfigGui.java b/src/main/java/xyz/alexcrea/cuanvil/gui/config/global/CustomRecipeConfigGui.java
index 5a68e6e..953f37f 100644
--- a/src/main/java/xyz/alexcrea/cuanvil/gui/config/global/CustomRecipeConfigGui.java
+++ b/src/main/java/xyz/alexcrea/cuanvil/gui/config/global/CustomRecipeConfigGui.java
@@ -17,7 +17,8 @@ import xyz.alexcrea.cuanvil.util.CasedStringUtil;
 import java.util.Arrays;
 import java.util.Collection;
 
-public class CustomRecipeConfigGui extends MappedGuiListConfigGui<AnvilCustomRecipe, CustomRecipeSubSettingGui> {
+public class CustomRecipeConfigGui extends MappedGuiListConfigGui<AnvilCustomRecipe,
+        MappedGuiListConfigGui.LazyElement<CustomRecipeSubSettingGui>> {
 
 
     private static CustomRecipeConfigGui INSTANCE = new CustomRecipeConfigGui();
@@ -44,15 +45,15 @@ public class CustomRecipeConfigGui extends MappedGuiListConfigGui<AnvilCustomRec
     protected ItemStack createItemForGeneric(AnvilCustomRecipe recipe) {
         // Get base item to display
         ItemStack craftResultItem = recipe.getResultItem();
-        ItemStack displaydItem;
+        ItemStack displayedItem;
         if(craftResultItem == null){
-            displaydItem = new ItemStack(Material.BARRIER);
+            displayedItem = new ItemStack(Material.BARRIER);
         }else{
-            displaydItem = craftResultItem.clone();
+            displayedItem = craftResultItem.clone();
         }
 
         // edit displayed item
-        ItemMeta meta = displaydItem.getItemMeta();
+        ItemMeta meta = displayedItem.getItemMeta();
         assert meta != null;
 
         meta.setDisplayName("§e" + CasedStringUtil.snakeToUpperSpacedCase(recipe.toString()) + " §fCustom recipe");
@@ -67,13 +68,13 @@ public class CustomRecipeConfigGui extends MappedGuiListConfigGui<AnvilCustomRec
 
         ));
 
-        displaydItem.setItemMeta(meta);
-        return displaydItem;
+        displayedItem.setItemMeta(meta);
+        return displayedItem;
     }
 
     @Override
-    protected CustomRecipeSubSettingGui newInstanceOfGui(AnvilCustomRecipe generic, GuiItem item) {
-        return new CustomRecipeSubSettingGui(this, generic, item);
+    protected LazyElement<CustomRecipeSubSettingGui> newInstanceOfGui(AnvilCustomRecipe generic, GuiItem item) {
+        return new LazyElement<>(item, () -> new CustomRecipeSubSettingGui(this, generic));
     }
 
     @Override
diff --git a/src/main/java/xyz/alexcrea/cuanvil/gui/config/global/EnchantConflictGui.java b/src/main/java/xyz/alexcrea/cuanvil/gui/config/global/EnchantConflictGui.java
index e9525f4..912e6cb 100644
--- a/src/main/java/xyz/alexcrea/cuanvil/gui/config/global/EnchantConflictGui.java
+++ b/src/main/java/xyz/alexcrea/cuanvil/gui/config/global/EnchantConflictGui.java
@@ -18,7 +18,8 @@ import xyz.alexcrea.cuanvil.util.CasedStringUtil;
 import java.util.Arrays;
 import java.util.Collection;
 
-public class EnchantConflictGui extends MappedGuiListConfigGui<EnchantConflictGroup, EnchantConflictSubSettingGui> {
+public class EnchantConflictGui extends MappedGuiListConfigGui<EnchantConflictGroup,
+        MappedGuiListConfigGui.LazyElement<EnchantConflictSubSettingGui>> {
 
     private static EnchantConflictGui INSTANCE;
 
@@ -86,8 +87,8 @@ public class EnchantConflictGui extends MappedGuiListConfigGui<EnchantConflictGr
     }
 
     @Override
-    protected EnchantConflictSubSettingGui newInstanceOfGui(EnchantConflictGroup conflict, GuiItem item) {
-        return new EnchantConflictSubSettingGui(this, conflict, item);
+    protected LazyElement<EnchantConflictSubSettingGui> newInstanceOfGui(EnchantConflictGroup conflict, GuiItem item) {
+        return new LazyElement<>(item, () -> new EnchantConflictSubSettingGui(this, conflict));
     }
 
     @Override
diff --git a/src/main/java/xyz/alexcrea/cuanvil/gui/config/global/GroupConfigGui.java b/src/main/java/xyz/alexcrea/cuanvil/gui/config/global/GroupConfigGui.java
index 8684d4d..8e20751 100644
--- a/src/main/java/xyz/alexcrea/cuanvil/gui/config/global/GroupConfigGui.java
+++ b/src/main/java/xyz/alexcrea/cuanvil/gui/config/global/GroupConfigGui.java
@@ -15,12 +15,13 @@ import xyz.alexcrea.cuanvil.group.ItemGroupManager;
 import xyz.alexcrea.cuanvil.gui.config.list.MappedGuiListConfigGui;
 import xyz.alexcrea.cuanvil.gui.config.list.elements.GroupConfigSubSettingGui;
 import xyz.alexcrea.cuanvil.util.CasedStringUtil;
+import xyz.alexcrea.cuanvil.util.LazyValue;
 
 import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
 
-public class GroupConfigGui extends MappedGuiListConfigGui<IncludeGroup, GroupConfigSubSettingGui> {
+public class GroupConfigGui extends MappedGuiListConfigGui<IncludeGroup, MappedGuiListConfigGui.LazyElement<GroupConfigSubSettingGui>> {
 
     private static GroupConfigGui INSTANCE;
 
@@ -73,8 +74,8 @@ public class GroupConfigGui extends MappedGuiListConfigGui<IncludeGroup, GroupCo
     }
 
     @Override
-    protected GroupConfigSubSettingGui newInstanceOfGui(IncludeGroup group, GuiItem item) {
-        return new GroupConfigSubSettingGui(this, group, item);
+    protected LazyElement<GroupConfigSubSettingGui> newInstanceOfGui(IncludeGroup group, GuiItem item) {
+        return new LazyElement<>(item, () -> new GroupConfigSubSettingGui(this, group));
     }
 
     @Override
diff --git a/src/main/java/xyz/alexcrea/cuanvil/gui/config/global/UnitRepairConfigGui.java b/src/main/java/xyz/alexcrea/cuanvil/gui/config/global/UnitRepairConfigGui.java
index 833aea1..0e366ae 100644
--- a/src/main/java/xyz/alexcrea/cuanvil/gui/config/global/UnitRepairConfigGui.java
+++ b/src/main/java/xyz/alexcrea/cuanvil/gui/config/global/UnitRepairConfigGui.java
@@ -18,7 +18,8 @@ import java.util.ArrayList;
 import java.util.Arrays;
 import java.util.Collection;
 
-public class UnitRepairConfigGui extends MappedGuiListConfigGui<Material, UnitRepairElementListGui> {
+public class UnitRepairConfigGui extends
+        MappedGuiListConfigGui<Material, MappedGuiListConfigGui.LazyElement<UnitRepairElementListGui>> {
 
     private static UnitRepairConfigGui INSTANCE;
 
@@ -41,10 +42,12 @@ public class UnitRepairConfigGui extends MappedGuiListConfigGui<Material, UnitRe
     }
 
     @Override
-    protected UnitRepairElementListGui newInstanceOfGui(Material material, GuiItem item) {
-        UnitRepairElementListGui element = new UnitRepairElementListGui(material, this, item);
-        element.init();
-        return element;
+    protected LazyElement<UnitRepairElementListGui> newInstanceOfGui(Material material, GuiItem item) {
+        return new LazyElement<>(item, () -> {
+            UnitRepairElementListGui element = new UnitRepairElementListGui(material, this);
+            element.init();
+            return element;
+        });
     }
 
     @Override
@@ -115,7 +118,7 @@ public class UnitRepairConfigGui extends MappedGuiListConfigGui<Material, UnitRe
                         updateValueForGeneric(type, true);
 
                         // Display material edit setting
-                        this.elementGuiMap.get(type).getMappedGui().show(player);
+                        this.elementGuiMap.get(type).get().getMappedGui().show(player);
                     },
                     true
             ).show(clickEvent.getWhoClicked());
@@ -123,8 +126,8 @@ public class UnitRepairConfigGui extends MappedGuiListConfigGui<Material, UnitRe
     }
 
     @NotNull
-    public UnitRepairElementListGui getInstanceOrCreate(Material mat){
-        UnitRepairElementListGui element = this.elementGuiMap.get(mat);
+    public LazyElement<UnitRepairElementListGui> getInstanceOrCreate(Material mat){
+        LazyElement<UnitRepairElementListGui> element = this.elementGuiMap.get(mat);
         if(element == null){
             updateValueForGeneric(mat, false);
 
diff --git a/src/main/java/xyz/alexcrea/cuanvil/gui/config/list/MappedGuiListConfigGui.java b/src/main/java/xyz/alexcrea/cuanvil/gui/config/list/MappedGuiListConfigGui.java
index cf4b852..3aa18e0 100644
--- a/src/main/java/xyz/alexcrea/cuanvil/gui/config/list/MappedGuiListConfigGui.java
+++ b/src/main/java/xyz/alexcrea/cuanvil/gui/config/list/MappedGuiListConfigGui.java
@@ -3,15 +3,19 @@ package xyz.alexcrea.cuanvil.gui.config.list;
 import com.github.stefvanschie.inventoryframework.gui.GuiItem;
 import io.delilaheve.CustomAnvil;
 import org.bukkit.entity.HumanEntity;
+import org.bukkit.event.inventory.InventoryClickEvent;
 import org.jetbrains.annotations.NotNull;
 import xyz.alexcrea.cuanvil.gui.config.list.elements.ElementMappedToListGui;
 import xyz.alexcrea.cuanvil.gui.util.GuiGlobalActions;
+import xyz.alexcrea.cuanvil.util.LazyValue;
 
 import java.util.Locale;
 import java.util.concurrent.atomic.AtomicReference;
 import java.util.function.Consumer;
+import java.util.function.Supplier;
 
-public abstract class MappedGuiListConfigGui< T, S extends ElementMappedToListGui> extends MappedElementListConfigGui< T, S > {
+public abstract class MappedGuiListConfigGui< T, S extends MappedGuiListConfigGui.LazyElement<?>>
+        extends MappedElementListConfigGui< T, S > {
 
     protected MappedGuiListConfigGui(@NotNull String title) {
         super(title);
@@ -20,7 +24,10 @@ public abstract class MappedGuiListConfigGui< T, S extends ElementMappedToListGu
 
     @Override
     public void reloadValues() {
-        this.elementGuiMap.forEach((conflict, gui) -> gui.cleanAndBeUnusable());
+        this.elementGuiMap.forEach((conflict, element) -> {
+            ElementMappedToListGui gui = element.getStored();
+            if(gui != null) gui.cleanAndBeUnusable();
+        });
         this.elementGuiMap.clear();
 
         super.reloadValues();
@@ -30,23 +37,24 @@ public abstract class MappedGuiListConfigGui< T, S extends ElementMappedToListGu
     protected S newElementRequested(T generic, GuiItem newItem) {
         S element = newInstanceOfGui(generic, newItem);
 
-        newItem.setAction(GuiGlobalActions.openGuiAction(element.getMappedGui()));
+        newItem.setAction(element.openAction());
         return element;
     }
 
     @Override
     protected GuiItem findItemFromElement(T generic, S element) {
-        return element.getParentItemForThisGui();
+        return element.getParentItem();
     }
 
     @Override
     protected void updateElement(T generic, S element) {
-        element.updateLocal();
+        ElementMappedToListGui gui = element.getStored();
+        if(gui != null) gui.updateLocal();
     }
 
     @Override
     protected GuiItem findGuiItemForRemoval(T generic, S element) {
-        return element.getParentItemForThisGui();
+        return element.getParentItem();
     }
 
     @Override
@@ -90,7 +98,7 @@ public abstract class MappedGuiListConfigGui< T, S extends ElementMappedToListGu
             updateValueForGeneric(generic, true);
 
             // show the new conflict config to the player
-            this.elementGuiMap.get(generic).getMappedGui().show(player);
+            this.elementGuiMap.get(generic).get().getMappedGui().show(player);
 
             update();
         };
@@ -105,4 +113,28 @@ public abstract class MappedGuiListConfigGui< T, S extends ElementMappedToListGu
 
     protected abstract T createAndSaveNewEmptyGeneric(String name);
 
+    public static class LazyElement<T extends ElementMappedToListGui> extends LazyValue<T> {
+
+        private final GuiItem parentItem;
+        private final LazyValue<Consumer<InventoryClickEvent>> lazyOpenConsumer;
+        public LazyElement(GuiItem parentItem, Supplier<T> valueSupplier) {
+            super(valueSupplier);
+            this.parentItem = parentItem;
+
+            this.lazyOpenConsumer = new LazyValue<>(() ->
+                    GuiGlobalActions.openGuiAction(this.get().getMappedGui()))
+            ;
+        }
+
+        public GuiItem getParentItem() {
+            return parentItem;
+        }
+
+        @NotNull
+        public Consumer<InventoryClickEvent> openAction(){
+            return event -> lazyOpenConsumer.get().accept(event);
+        }
+
+    }
+
 }
diff --git a/src/main/java/xyz/alexcrea/cuanvil/gui/config/list/UnitRepairElementListGui.java b/src/main/java/xyz/alexcrea/cuanvil/gui/config/list/UnitRepairElementListGui.java
index 0bf2a03..35f8ebb 100644
--- a/src/main/java/xyz/alexcrea/cuanvil/gui/config/list/UnitRepairElementListGui.java
+++ b/src/main/java/xyz/alexcrea/cuanvil/gui/config/list/UnitRepairElementListGui.java
@@ -26,17 +26,14 @@ import java.util.function.Consumer;
 
 public class UnitRepairElementListGui extends SettingGuiListConfigGui<String, DoubleSettingGui.DoubleSettingFactory> implements ElementMappedToListGui {
 
-    private final GuiItem parentItem;
     private final Material parentMaterial;
     private final UnitRepairConfigGui parentGui;
     private final String materialName;
 
     private boolean shouldWork = true;
     public UnitRepairElementListGui(@NotNull Material parentMaterial,
-                                    @NotNull UnitRepairConfigGui parentGui,
-                                    @NotNull GuiItem parentItem) {
+                                    @NotNull UnitRepairConfigGui parentGui) {
         super("§e" + CasedStringUtil.snakeToUpperSpacedCase(parentMaterial.name().toLowerCase()) + " §rUnit repair");
-        this.parentItem = parentItem;
         this.parentMaterial = parentMaterial;
         this.parentGui = parentGui;
         this.materialName = CasedStringUtil.snakeToUpperSpacedCase(parentMaterial.name().toLowerCase());
@@ -165,11 +162,6 @@ public class UnitRepairElementListGui extends SettingGuiListConfigGui<String, Do
 
     // ElementMappedToListGui methods
 
-    @Override
-    public GuiItem getParentItemForThisGui() {
-        return this.parentItem;
-    }
-
     @Override // Not used in this implementation
     public void updateLocal() {}
 
diff --git a/src/main/java/xyz/alexcrea/cuanvil/gui/config/list/elements/CustomRecipeSubSettingGui.java b/src/main/java/xyz/alexcrea/cuanvil/gui/config/list/elements/CustomRecipeSubSettingGui.java
index c527221..adec0e9 100644
--- a/src/main/java/xyz/alexcrea/cuanvil/gui/config/list/elements/CustomRecipeSubSettingGui.java
+++ b/src/main/java/xyz/alexcrea/cuanvil/gui/config/list/elements/CustomRecipeSubSettingGui.java
@@ -35,9 +35,8 @@ public class CustomRecipeSubSettingGui extends MappedToListSubSettingGui {
 
     public CustomRecipeSubSettingGui(
             @NotNull CustomRecipeConfigGui parent,
-            @NotNull AnvilCustomRecipe anvilRecipe,
-            @NotNull GuiItem parentItemForThisGui) {
-        super(parentItemForThisGui, 3, "§e" + CasedStringUtil.snakeToUpperSpacedCase(anvilRecipe.toString()) + " §8Config");
+            @NotNull AnvilCustomRecipe anvilRecipe) {
+        super(3, "§e" + CasedStringUtil.snakeToUpperSpacedCase(anvilRecipe.toString()) + " §8Config");
         this.parent = parent;
         this.anvilRecipe = anvilRecipe;
 
diff --git a/src/main/java/xyz/alexcrea/cuanvil/gui/config/list/elements/ElementMappedToListGui.java b/src/main/java/xyz/alexcrea/cuanvil/gui/config/list/elements/ElementMappedToListGui.java
index 26bee20..637f72a 100644
--- a/src/main/java/xyz/alexcrea/cuanvil/gui/config/list/elements/ElementMappedToListGui.java
+++ b/src/main/java/xyz/alexcrea/cuanvil/gui/config/list/elements/ElementMappedToListGui.java
@@ -1,12 +1,9 @@
 package xyz.alexcrea.cuanvil.gui.config.list.elements;
 
-import com.github.stefvanschie.inventoryframework.gui.GuiItem;
 import com.github.stefvanschie.inventoryframework.gui.type.util.Gui;
 
 public interface ElementMappedToListGui {
 
-    GuiItem getParentItemForThisGui();
-
     void updateLocal();
 
     void cleanAndBeUnusable();
diff --git a/src/main/java/xyz/alexcrea/cuanvil/gui/config/list/elements/EnchantConflictSubSettingGui.java b/src/main/java/xyz/alexcrea/cuanvil/gui/config/list/elements/EnchantConflictSubSettingGui.java
index ccbcf63..99bba84 100644
--- a/src/main/java/xyz/alexcrea/cuanvil/gui/config/list/elements/EnchantConflictSubSettingGui.java
+++ b/src/main/java/xyz/alexcrea/cuanvil/gui/config/list/elements/EnchantConflictSubSettingGui.java
@@ -39,10 +39,8 @@ public class EnchantConflictSubSettingGui extends MappedToListSubSettingGui impl
 
     public EnchantConflictSubSettingGui(
             @NotNull EnchantConflictGui parent,
-            @NotNull EnchantConflictGroup enchantConflict,
-            @NotNull GuiItem parentItemForThisGui) {
-        super(parentItemForThisGui,
-                3,
+            @NotNull EnchantConflictGroup enchantConflict) {
+        super(3,
                 "§e" + CasedStringUtil.snakeToUpperSpacedCase(enchantConflict.toString()) + " §8Config");
         this.parent = parent;
         this.enchantConflict = enchantConflict;
diff --git a/src/main/java/xyz/alexcrea/cuanvil/gui/config/list/elements/GroupConfigSubSettingGui.java b/src/main/java/xyz/alexcrea/cuanvil/gui/config/list/elements/GroupConfigSubSettingGui.java
index 6c41bc3..efa1117 100644
--- a/src/main/java/xyz/alexcrea/cuanvil/gui/config/list/elements/GroupConfigSubSettingGui.java
+++ b/src/main/java/xyz/alexcrea/cuanvil/gui/config/list/elements/GroupConfigSubSettingGui.java
@@ -37,9 +37,8 @@ public class GroupConfigSubSettingGui extends MappedToListSubSettingGui implemen
 
     public GroupConfigSubSettingGui(
             @NotNull GroupConfigGui parent,
-            @NotNull IncludeGroup group,
-            @NotNull GuiItem item) {
-        super(item, 3,
+            @NotNull IncludeGroup group) {
+        super(3,
                 CasedStringUtil.snakeToUpperSpacedCase(group.getName()) + " Config");
         this.parent = parent;
         this.group = group;
diff --git a/src/main/java/xyz/alexcrea/cuanvil/gui/config/list/elements/MappedToListSubSettingGui.java b/src/main/java/xyz/alexcrea/cuanvil/gui/config/list/elements/MappedToListSubSettingGui.java
index 020e6ed..1d86781 100644
--- a/src/main/java/xyz/alexcrea/cuanvil/gui/config/list/elements/MappedToListSubSettingGui.java
+++ b/src/main/java/xyz/alexcrea/cuanvil/gui/config/list/elements/MappedToListSubSettingGui.java
@@ -9,18 +9,10 @@ import xyz.alexcrea.cuanvil.gui.ValueUpdatableGui;
 
 public abstract class MappedToListSubSettingGui extends ChestGui implements ValueUpdatableGui, ElementMappedToListGui {
 
-    private final GuiItem item;
     protected MappedToListSubSettingGui(
-            GuiItem item,
             int rows,
             @NotNull String title) {
         super(rows, title, CustomAnvil.instance);
-        this.item = item;
-    }
-
-    @Override
-    public GuiItem getParentItemForThisGui() {
-        return item;
     }
 
     @Override
diff --git a/src/main/java/xyz/alexcrea/cuanvil/util/LazyValue.java b/src/main/java/xyz/alexcrea/cuanvil/util/LazyValue.java
new file mode 100644
index 0000000..3ae8fdd
--- /dev/null
+++ b/src/main/java/xyz/alexcrea/cuanvil/util/LazyValue.java
@@ -0,0 +1,36 @@
+package xyz.alexcrea.cuanvil.util;
+
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.function.Supplier;
+
+public class LazyValue<T> {
+
+    private final Supplier<T> valueSupplier;
+    private T storedValue;
+
+    public LazyValue(Supplier<T> valueSupplier) {
+        this.valueSupplier = valueSupplier;
+        this.storedValue = null;
+    }
+
+    @Nullable
+    public T getStored(){
+        return storedValue;
+    }
+
+    @NotNull
+    public T get(){
+        if (storedValue != null) return storedValue;
+
+        synchronized(this) {
+            if(storedValue == null) {
+                storedValue = valueSupplier.get();
+            }
+        }
+
+        return storedValue;
+    }
+
+}