actually working version of creating components

src/main/java/com/gtnewhorizons/mutecore/api/data/ItemInputInventory.java

@@ -16,6 +16,10 @@ public class ItemInputInventory implements ItemInventory, WorldStateValidator {
     private long limit;
     private UUID key;
 
+    public ItemInputInventory(Integer size, Long limit) {
+        this((int) size, (long) limit);
+    }
+
     public ItemInputInventory(int size, long limit) {
         inv = new IItemStackLong[size];
         for (int i = 0; i < size; i++) {

src/main/java/com/gtnewhorizons/mutecore/api/registry/ComponentsCreator.java

@@ -0,0 +1,33 @@
+package com.gtnewhorizons.mutecore.api.registry;
+
+import java.util.ArrayList;
+import java.util.List;
+import java.util.function.Supplier;
+
+public class ComponentsCreator {
+
+    private boolean built;
+    private List<Supplier<Object>> componentBuilders = new ArrayList<>();
+
+    public ComponentsCreator() {}
+
+    public ComponentsCreator component(Supplier<Object> componentBuilder) {
+        if (built) throw new IllegalStateException("Cannot add components after the builder has been finished");
+        componentBuilders.add(componentBuilder);
+        return this;
+    }
+
+    public ComponentsCreator build() {
+        built = true;
+        return this;
+    }
+
+    public List<Object> createComponents() {
+        if (!built) throw new IllegalStateException("Cannot create components when the builder is unfinished");
+        List<Object> components = new ArrayList<>();
+        for (int i = 0; i < componentBuilders.size(); i++) {
+            components.add(componentBuilders.get(i).get());
+        }
+        return components;
+    }
+}

src/main/java/com/gtnewhorizons/mutecore/api/registry/MultiTileContainer.java

@@ -25,7 +25,7 @@ public class MultiTileContainer {
     private final @Nonnull Class<? extends MultiTileEntity> clazz;
     private final int id;
     private final @Nonnull WeakReference<MultiTileEntityRegistry> reg;
-    private final Set<ComponentContainer> components;
+    private @Nonnull ComponentsCreator componentsCreator;
     private final @Nonnull Entity fakeEntity;
     private Class<? extends TooltipAssigner> tooltipClass;
     private @Nonnull MuTEGUI gui;
@@ -37,13 +37,13 @@ public MultiTileContainer(@Nonnull MultiTileEntityRegistry reg, int id,
         this.clazz = clazz;
         this.id = id;
         fakeEntity = MuTECore.ENGINE.createEntity(new FakeEntity());
-        components = new HashSet<>();
     }
 
-    public @Nonnull MultiTileContainer addComponents(ComponentContainer... components) {
-        for (ComponentContainer component : components) {
-            this.components.add(component);
-            fakeEntity.add(component.create());
+    public @Nonnull MultiTileContainer componentsCreator(ComponentsCreator componentsCreator) {
+        this.componentsCreator = componentsCreator;
+        List<Object> components = this.componentsCreator.createComponents();
+        for (int i = 0; i < components.size(); i++) {
+            fakeEntity.add(components.get(i));
         }
         return this;
     }
@@ -70,12 +70,7 @@ public boolean register() {
     }
 
     public @Nonnull Entity createNewEntity() {
-        List<Object> components = new ArrayList<>();
-        for (ComponentContainer componentContainer : this.components) {
-            Object component = componentContainer.create();
-            if (component == null) continue;
-            components.add(component);
-        }
+        List<Object> components = componentsCreator.createComponents();
         Entity newEntity = MuTECore.ENGINE.createEntity(components.toArray());
         newEntity.add(
             new Id(