Subject: [PATCH] Example
---
Index: net/minecraft/world/item/Item.java
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
diff --git a/net/minecraft/world/item/Item.java b/net/minecraft/world/item/Item.java
--- a/net/minecraft/world/item/Item.java    (revision 558a1a2ed8f73bdf1fe4c92601441fedff1b812c)
+++ b/net/minecraft/world/item/Item.java    (revision 45fd9ba0a88769b3d696c31d1bdcb6741cef9b75)
@@ -18,6 +18,7 @@
 import net.minecraft.core.component.DataComponentMap;
 import net.minecraft.core.component.DataComponentType;
 import net.minecraft.core.component.DataComponents;
+import net.minecraft.core.component.PatchedDataComponentMap;
 import net.minecraft.core.registries.BuiltInRegistries;
 import net.minecraft.network.chat.Component;
 import net.minecraft.sounds.SoundEvent;
@@ -64,7 +65,7 @@
     public static final int ABSOLUTE_MAX_STACK_SIZE = 99;
     public static final int MAX_BAR_WIDTH = 13;
     private final Holder.Reference<Item> builtInRegistryHolder = BuiltInRegistries.ITEM.createIntrusiveHolder(this);
-    private final DataComponentMap components;
+    private final PatchedDataComponentMap components; // Paper - default component api
     @Nullable
     private final Item craftingRemainingItem;
     @Nullable
@@ -85,7 +86,11 @@
     }

     public Item(Item.Properties properties) {
-        this.components = properties.buildAndValidateComponents();
+        //Paper start - default component api
+        PatchedDataComponentMap components = new PatchedDataComponentMap(properties.buildAndValidateComponents());
+        // Call event
+        this.components = components;
+        //Paper end - default component api
         this.craftingRemainingItem = properties.craftingRemainingItem;
         this.requiredFeatures = properties.requiredFeatures;
         if (SharedConstants.IS_RUNNING_IN_IDE) {
@@ -104,6 +109,10 @@
     public DataComponentMap components() {
         return this.components;
     }
+
+    public PatchedDataComponentMap patchedComponents() {
+        return this.components.copy(); // Paper - default component api
+    }

     public int getDefaultMaxStackSize() {
         return this.components.getOrDefault(DataComponents.MAX_STACK_SIZE, 1);
Index: net/minecraft/world/item/ItemStack.java
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
diff --git a/net/minecraft/world/item/ItemStack.java b/net/minecraft/world/item/ItemStack.java
--- a/net/minecraft/world/item/ItemStack.java   (revision 558a1a2ed8f73bdf1fe4c92601441fedff1b812c)
+++ b/net/minecraft/world/item/ItemStack.java   (revision 45fd9ba0a88769b3d696c31d1bdcb6741cef9b75)
@@ -216,16 +216,27 @@
         this(tag.value(), 1);
     }

+    // Paper start - default component api
+    // Ensure that item stacks from packets and other sources are based on our defaults
     public ItemStack(Holder<Item> holder, int i, DataComponentPatch dataComponentPatch) {
-        this(holder.value(), i, PatchedDataComponentMap.fromPatch(holder.value().components(), dataComponentPatch));
+        this(holder.value(), i, createComponentMap(holder.value(), dataComponentPatch));
     }
+    private static PatchedDataComponentMap createComponentMap(Item item, DataComponentPatch patch) {
+        PatchedDataComponentMap copy = item.patchedComponents();
+        if (patch.isEmpty()) {
+            return copy;
+        }
+        copy.applyPatch(patch);
+        return copy;
+    }
+    // Paper end - default component api

     public ItemStack(Holder<Item> item, int count) {
         this(item.value(), count);
     }

     public ItemStack(ItemLike item, int count) {
-        this(item, count, new PatchedDataComponentMap(item.asItem().components()));
+        this(item, count, item.asItem().patchedComponents()); // Paper - default component api
     }

     private ItemStack(ItemLike itemLike, int i, PatchedDataComponentMap patchedDataComponentMap) {