WIP item meta API

src/main/java/net/minestom/server/item/Item.java

@@ -1,6 +1,7 @@
 package net.minestom.server.item;
 
 import net.kyori.adventure.text.Component;
+import net.minestom.server.item.metadata.ItemMeta;
 import org.jetbrains.annotations.Contract;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
@@ -14,6 +15,7 @@ public class Item {
 
     private final Material material;
     private final int amount;
+    //private final ItemMeta meta;
     private final Component displayName;
     private final List<Component> lore;
 
@@ -60,6 +62,10 @@ public class Item {
         return withAmount(intUnaryOperator.applyAsInt(amount));
     }
 
+    public <T extends ItemMeta> @NotNull Item withMeta(Class<T> metaType, Consumer<T> metaConsumer) {
+        return builder().meta(metaType, metaConsumer).build();
+    }
+
     @Contract(pure = true)
     public @Nullable Component getDisplayName() {
         return displayName;

src/main/java/net/minestom/server/item/ItemBuilder.java

@@ -1,6 +1,7 @@
 package net.minestom.server.item;
 
 import net.kyori.adventure.text.Component;
+import net.minestom.server.item.metadata.ItemMeta;
 import org.jetbrains.annotations.Contract;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
@@ -8,6 +9,7 @@ import org.jetbrains.annotations.Nullable;
 import java.util.Arrays;
 import java.util.Collections;
 import java.util.List;
+import java.util.function.Consumer;
 
 public class ItemBuilder {
 
@@ -27,6 +29,12 @@ public class ItemBuilder {
         return this;
     }
 
+    @Contract(value = "_, _ -> this")
+    public <T extends ItemMeta> @NotNull ItemBuilder meta(Class<T> metaType, Consumer<T> metaConsumer) {
+        // TODO
+        return this;
+    }
+
     @Contract(value = "_ -> this")
     public @NotNull ItemBuilder displayName(@Nullable Component displayName) {
         this.displayName = displayName;

src/main/java/net/minestom/server/item/ItemMetaBuilder.java

@@ -0,0 +1,5 @@
+package net.minestom.server.item;
+
+public class ItemMetaBuilder {
+
+}

src/test/java/demo/PlayerInit.java

@@ -29,6 +29,7 @@ import net.minestom.server.inventory.PlayerInventory;
 import net.minestom.server.item.Item;
 import net.minestom.server.item.ItemStack;
 import net.minestom.server.item.Material;
+import net.minestom.server.item.metadata.WritableBookMeta;
 import net.minestom.server.network.ConnectionManager;
 import net.minestom.server.ping.ResponseDataConsumer;
 import net.minestom.server.utils.Position;
@@ -65,14 +66,24 @@ public class PlayerInit {
         //inventory.setItemStack(3, new ItemStack(Material.DIAMOND, (byte) 34));
 
         {
-            Item item = Item.builder(Material.STONE)
+            Item item = Item.builder(Material.WRITABLE_BOOK)
                     .amount(5)
+                    .meta(WritableBookMeta.class, writableBookMeta -> {
+                        writableBookMeta.setTitle("Title");
+                    })
                     .displayName(Component.text("displayName"))
                     .build();
 
             item = item.with(itemBuilder -> itemBuilder
                     .amount(10)
+                    .meta(WritableBookMeta.class, writableBookMeta -> {
+                        writableBookMeta.setTitle("Title2");
+                    })
                     .lore(Component.text("Lore")));
+
+            item = item.withMeta(WritableBookMeta.class, writableBookMeta -> {
+                writableBookMeta.setTitle("Title3");
+            });
         }
 
     }