LootTable API

Provides API to control what Loot Table an object uses.

Also provides an Event to control if a lootable inventory should
auto replenish for a player.

Provides methods to determine players looted state for an object

paper-api/src/main/java/com/destroystokyo/paper/loottable/LootableBlockInventory.java

@@ -0,0 +1,17 @@
+package com.destroystokyo.paper.loottable;
+
+import org.bukkit.block.Block;
+import org.jspecify.annotations.NullMarked;
+
+/**
+ * Represents an Inventory that can generate loot, such as Chests inside of Fortresses and Mineshafts
+ */
+@NullMarked
+public interface LootableBlockInventory extends LootableInventory {
+
+    /**
+     * Gets the block that is lootable
+     * @return The Block
+     */
+    Block getBlock();
+}

paper-api/src/main/java/com/destroystokyo/paper/loottable/LootableEntityInventory.java

@@ -0,0 +1,17 @@
+package com.destroystokyo.paper.loottable;
+
+import org.bukkit.entity.Entity;
+import org.jspecify.annotations.NullMarked;
+
+/**
+ * Represents an Inventory that can generate loot, such as Minecarts inside of Mineshafts
+ */
+@NullMarked
+public interface LootableEntityInventory extends LootableInventory {
+
+    /**
+     * Gets the entity that is lootable
+     * @return The Entity
+     */
+    Entity getEntity();
+}

paper-api/src/main/java/com/destroystokyo/paper/loottable/LootableInventory.java

@@ -0,0 +1,128 @@
+package com.destroystokyo.paper.loottable;
+
+import java.util.UUID;
+import org.bukkit.entity.Player;
+import org.bukkit.loot.Lootable;
+import org.jspecify.annotations.NullMarked;
+import org.jspecify.annotations.Nullable;
+
+/**
+ * Represents an Inventory that contains a Loot Table associated to it that will
+ * automatically fill on first open.
+ * <p>
+ * A new feature and API is provided to support automatically refreshing the contents
+ * of the inventory based on that Loot Table after a configurable amount of time has passed.
+ * <p>
+ * The behavior of how the Inventory is filled based on the loot table may vary based
+ * on Minecraft versions and the Loot Table feature.
+ */
+@NullMarked
+public interface LootableInventory extends Lootable {
+
+    /**
+     * Server owners have to enable whether an object in a world should refill
+     *
+     * @return If the world this inventory is currently in has Replenishable Lootables enabled
+     */
+    boolean isRefillEnabled();
+
+    /**
+     * Whether this object has ever been filled
+     *
+     * @return Has ever been filled
+     */
+    boolean hasBeenFilled();
+
+    /**
+     * Has this player ever looted this block
+     *
+     * @param player The player to check
+     * @return Whether this player has looted this block
+     */
+    default boolean hasPlayerLooted(final Player player) {
+        return this.hasPlayerLooted(player.getUniqueId());
+    }
+
+    /**
+     * Checks if this player can loot this block. Takes into account the "restrict player reloot" settings
+     *
+     * @param player the player to check
+     * @return Whether this player can loot this block
+     */
+    boolean canPlayerLoot(UUID player);
+
+    /**
+     * Has this player ever looted this block
+     *
+     * @param player The player to check
+     * @return Whether this player has looted this block
+     */
+    boolean hasPlayerLooted(UUID player);
+
+    /**
+     * Gets the timestamp, in milliseconds, of when the player last looted this object
+     *
+     * @param player The player to check
+     * @return Timestamp last looted, or null if player has not looted this object
+     */
+    default @Nullable Long getLastLooted(final Player player) {
+        return this.getLastLooted(player.getUniqueId());
+    }
+
+    /**
+     * Gets the timestamp, in milliseconds, of when the player last looted this object
+     *
+     * @param player The player to check
+     * @return Timestamp last looted, or null if player has not looted this object
+     */
+    @Nullable Long getLastLooted(UUID player);
+
+    /**
+     * Change the state of whether a player has looted this block
+     *
+     * @param player The player to change state for
+     * @param looted true to add player to looted list, false to remove
+     * @return The previous state of whether the player had looted this or not
+     */
+    default boolean setHasPlayerLooted(final Player player, final boolean looted) {
+        return this.setHasPlayerLooted(player.getUniqueId(), looted);
+    }
+
+    /**
+     * Change the state of whether a player has looted this block
+     *
+     * @param player The player to change state for
+     * @param looted true to add player to looted list, false to remove
+     * @return The previous state of whether the player had looted this or not
+     */
+    boolean setHasPlayerLooted(UUID player, boolean looted);
+
+    /**
+     * Returns Whether this object has been filled and now has a pending refill
+     *
+     * @return Has pending refill
+     */
+    boolean hasPendingRefill();
+
+    /**
+     * Gets the timestamp in milliseconds that the Lootable object was last refilled
+     *
+     * @return -1 if it was never refilled, or timestamp in milliseconds
+     */
+    long getLastFilled();
+
+    /**
+     * Gets the timestamp in milliseconds that the Lootable object will refill
+     *
+     * @return -1 if it is not scheduled for refill, or timestamp in milliseconds
+     */
+    long getNextRefill();
+
+    /**
+     * Sets the timestamp in milliseconds of the next refill for this object
+     *
+     * @param refillAt timestamp in milliseconds. -1 to clear next refill
+     * @return The previous scheduled time to refill, or -1 if was not scheduled
+     */
+    long setNextRefill(long refillAt);
+}

paper-api/src/main/java/com/destroystokyo/paper/loottable/LootableInventoryReplenishEvent.java

@@ -0,0 +1,46 @@
+package com.destroystokyo.paper.loottable;
+
+import org.bukkit.entity.Player;
+import org.bukkit.event.Cancellable;
+import org.bukkit.event.HandlerList;
+import org.bukkit.event.player.PlayerEvent;
+import org.jetbrains.annotations.ApiStatus;
+import org.jspecify.annotations.NullMarked;
+
+@NullMarked
+public class LootableInventoryReplenishEvent extends PlayerEvent implements Cancellable {
+
+    private static final HandlerList HANDLER_LIST = new HandlerList();
+
+    private final LootableInventory inventory;
+    private boolean cancelled;
+
+    @ApiStatus.Internal
+    public LootableInventoryReplenishEvent(final Player player, final LootableInventory inventory) {
+        super(player);
+        this.inventory = inventory;
+    }
+
+    public LootableInventory getInventory() {
+        return this.inventory;
+    }
+
+    @Override
+    public boolean isCancelled() {
+        return this.cancelled;
+    }
+
+    @Override
+    public void setCancelled(final boolean cancel) {
+        this.cancelled = cancel;
+    }
+
+    @Override
+    public HandlerList getHandlers() {
+        return HANDLER_LIST;
+    }
+
+    public static HandlerList getHandlerList() {
+        return HANDLER_LIST;
+    }
+}

paper-api/src/main/java/org/bukkit/block/Barrel.java

@@ -5,4 +5,4 @@ import org.bukkit.loot.Lootable;
 /**
  * Represents a captured state of a Barrel.
  */
-public interface Barrel extends Container, Lootable, Lidded { }
+public interface Barrel extends Container, com.destroystokyo.paper.loottable.LootableBlockInventory, Lidded { } // Paper

paper-api/src/main/java/org/bukkit/block/Chest.java

@@ -1,5 +1,7 @@
 package org.bukkit.block;
 
+import com.destroystokyo.paper.loottable.LootableBlockInventory; // Paper
+import org.bukkit.Nameable; // Paper
 import org.bukkit.inventory.Inventory;
 import org.bukkit.loot.Lootable;
 import org.jetbrains.annotations.NotNull;
@@ -7,7 +9,7 @@ import org.jetbrains.annotations.NotNull;
 /**
  * Represents a captured state of a chest.
  */
-public interface Chest extends Container, Lootable, Lidded {
+public interface Chest extends Container, LootableBlockInventory, Lidded { // Paper
 
     /**
      * Gets the inventory of the chest block represented by this block state.

paper-api/src/main/java/org/bukkit/block/Crafter.java

@@ -7,7 +7,7 @@ import org.jetbrains.annotations.ApiStatus;
  * Represents a captured state of a crafter.
  */
 @ApiStatus.Experimental
-public interface Crafter extends Container, Lootable {
+public interface Crafter extends Container, com.destroystokyo.paper.loottable.LootableBlockInventory { // Paper - LootTable API
 
     /**
      * Gets the number of ticks which this block will remain in the crafting

paper-api/src/main/java/org/bukkit/block/Dispenser.java

@@ -1,5 +1,6 @@
 package org.bukkit.block;
 
+import com.destroystokyo.paper.loottable.LootableBlockInventory;
 import org.bukkit.Nameable;
 import org.bukkit.loot.Lootable;
 import org.bukkit.projectiles.BlockProjectileSource;
@@ -8,7 +9,7 @@ import org.jetbrains.annotations.Nullable;
 /**
  * Represents a captured state of a dispenser.
  */
-public interface Dispenser extends Container, Nameable, Lootable {
+public interface Dispenser extends Container, Nameable, LootableBlockInventory { // Paper
 
     /**
      * Gets the BlockProjectileSource object for the dispenser.

paper-api/src/main/java/org/bukkit/block/Dropper.java

@@ -1,11 +1,12 @@
 package org.bukkit.block;
 
+import com.destroystokyo.paper.loottable.LootableBlockInventory;
 import org.bukkit.loot.Lootable;
 
 /**
  * Represents a captured state of a dropper.
  */
-public interface Dropper extends Container, Lootable {
+public interface Dropper extends Container, LootableBlockInventory { // Paper
 
     /**
      * Tries to drop a randomly selected item from the dropper's inventory,

paper-api/src/main/java/org/bukkit/block/Hopper.java

@@ -1,8 +1,9 @@
 package org.bukkit.block;
 
+import com.destroystokyo.paper.loottable.LootableBlockInventory;
 import org.bukkit.loot.Lootable;
 
 /**
  * Represents a captured state of a hopper.
  */
-public interface Hopper extends Container, Lootable { }
+public interface Hopper extends Container, LootableBlockInventory { } // Paper

paper-api/src/main/java/org/bukkit/block/ShulkerBox.java

@@ -1,5 +1,6 @@
 package org.bukkit.block;
 
+import com.destroystokyo.paper.loottable.LootableBlockInventory;
 import org.bukkit.DyeColor;
 import org.bukkit.loot.Lootable;
 import org.jetbrains.annotations.Nullable;
@@ -7,7 +8,7 @@ import org.jetbrains.annotations.Nullable;
 /**
  * Represents a captured state of a ShulkerBox.
  */
-public interface ShulkerBox extends Container, Lootable, Lidded {
+public interface ShulkerBox extends Container, LootableBlockInventory, Lidded { // Paper
 
     /**
      * Get the {@link DyeColor} corresponding to this ShulkerBox

paper-api/src/main/java/org/bukkit/entity/ChestBoat.java

@@ -6,5 +6,5 @@ import org.bukkit.loot.Lootable;
 /**
  * A {@link Boat} with a chest.
  */
-public interface ChestBoat extends Boat, InventoryHolder, Lootable {
+public interface ChestBoat extends Boat, InventoryHolder, com.destroystokyo.paper.loottable.LootableEntityInventory { // Paper
 }

paper-api/src/main/java/org/bukkit/entity/Mob.java

@@ -61,4 +61,12 @@ public interface Mob extends LivingEntity, Lootable {
      */
     @Nullable
     public Sound getAmbientSound();
+
+    // Paper start - LootTable API
+    @Override
+    default void setLootTable(final @Nullable org.bukkit.loot.LootTable table, final long seed) {
+        this.setLootTable(table);
+        this.setSeed(seed);
+    }
+    // Paper end - LootTable API
 }

paper-api/src/main/java/org/bukkit/entity/minecart/HopperMinecart.java

@@ -1,5 +1,6 @@
 package org.bukkit.entity.minecart;
 
+import com.destroystokyo.paper.loottable.LootableEntityInventory;
 import org.bukkit.entity.Minecart;
 import org.bukkit.inventory.InventoryHolder;
 import org.bukkit.loot.Lootable;
@@ -7,7 +8,7 @@ import org.bukkit.loot.Lootable;
 /**
  * Represents a Minecart with a Hopper inside it
  */
-public interface HopperMinecart extends Minecart, InventoryHolder, Lootable {
+public interface HopperMinecart extends Minecart, InventoryHolder, LootableEntityInventory {
 
     /**
      * Checks whether or not this Minecart will pick up

paper-api/src/main/java/org/bukkit/entity/minecart/StorageMinecart.java

@@ -1,5 +1,6 @@
 package org.bukkit.entity.minecart;
 
+import com.destroystokyo.paper.loottable.LootableEntityInventory;
 import org.bukkit.entity.Minecart;
 import org.bukkit.inventory.InventoryHolder;
 import org.bukkit.loot.Lootable;
@@ -9,5 +10,5 @@ import org.bukkit.loot.Lootable;
  * minecarts} have their own inventory that can be accessed using methods
  * from the {@link InventoryHolder} interface.
  */
-public interface StorageMinecart extends Minecart, InventoryHolder, Lootable {
+public interface StorageMinecart extends Minecart, InventoryHolder, LootableEntityInventory { // Paper
 }

paper-api/src/main/java/org/bukkit/loot/Lootable.java

@@ -35,6 +35,31 @@ public interface Lootable {
     @Nullable
     LootTable getLootTable();
 
+    // Paper start
+    /**
+     * Set the loot table and seed for a container or entity at the same time.
+     *
+     * @param table the Loot Table this {@link org.bukkit.block.Container} or {@link org.bukkit.entity.Mob} will have.
+     * @param seed the seed to used to generate loot. Default is 0.
+     */
+    void setLootTable(final @Nullable LootTable table, final long seed);
+
+    /**
+     * Returns whether or not this object has a Loot Table
+     * @return Has a loot table
+     */
+    default boolean hasLootTable() {
+        return this.getLootTable() != null;
+    }
+
+    /**
+     * Clears the associated Loot Table to this object
+     */
+    default void clearLootTable() {
+        this.setLootTable(null);
+    }
+    // Paper end
+
     /**
      * Set the seed used when this Loot Table generates loot.
      *