Add ItemType#getBurnDuration() (#12604)

paper-api/src/main/java/org/bukkit/inventory/ItemType.java

@@ -3021,9 +3021,18 @@ public interface ItemType extends Keyed, Translatable, net.kyori.adventure.trans
      * Checks if this item type can be used as fuel in a Furnace
      *
      * @return true if this item type can be used as fuel.
+     * @see #getBurnDuration() 
      */
     boolean isFuel();
 
+    /**
+     * Retrieve the item's burn duration in a Furnace
+     * 
+     * @return the burn duration, in ticks or 0 if the item is not fuel
+     * @see #isFuel()
+     */
+    int getBurnDuration();
+
     /**
      * Checks whether this item type is compostable (can be inserted into a
      * composter).

paper-server/src/main/java/org/bukkit/craftbukkit/inventory/CraftItemType.java

@@ -15,6 +15,7 @@ import net.minecraft.world.item.BlockItem;
 import net.minecraft.world.item.Item;
 import net.minecraft.world.item.component.ItemAttributeModifiers;
 import net.minecraft.world.level.block.ComposterBlock;
+import net.minecraft.world.level.block.entity.FuelValues;
 import org.bukkit.Material;
 import org.bukkit.Registry;
 import org.bukkit.World;
@@ -155,6 +156,18 @@ public class CraftItemType<M extends ItemMeta> extends HolderableBase<Item> impl
         return MinecraftServer.getServer().fuelValues().isFuel(new net.minecraft.world.item.ItemStack(this.getHandle()));
     }
 
+    @Override
+    public int getBurnDuration() {
+        FuelValues fuelValues = MinecraftServer.getServer().fuelValues();
+        net.minecraft.world.item.ItemStack stack = new net.minecraft.world.item.ItemStack(this.getHandle());
+        
+        if (!fuelValues.isFuel(stack)) {
+            return 0;
+        }
+        
+        return fuelValues.burnDuration(stack);
+    }
+
     @Override
     public boolean isCompostable() {
         return ComposterBlock.COMPOSTABLES.containsKey(this.getHandle());