From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jake Potrebic <jake.m.potrebic@gmail.com>
Date: Wed, 22 May 2024 10:00:19 -0700
Subject: [PATCH] Fix equipment slot and group API

Adds the following:
- Add missing 'body' slot group
- Expose LivingEntity#canUseSlot

Co-authored-by: SoSeDiK <mrsosedik@gmail.com>

diff --git a/src/main/java/org/bukkit/attribute/AttributeModifier.java b/src/main/java/org/bukkit/attribute/AttributeModifier.java
index 9b47cbb93399a22301ec643e4be8f173314c455e..097396166b94ec7c9581a7b2f4ef644f95708671 100644
--- a/src/main/java/org/bukkit/attribute/AttributeModifier.java
+++ b/src/main/java/org/bukkit/attribute/AttributeModifier.java
@@ -96,6 +96,7 @@ public class AttributeModifier implements ConfigurationSerializable {
      */
     @Nullable
     @Deprecated
+    @io.papermc.paper.annotation.DoNotUse // Paper
     public EquipmentSlot getSlot() {
         return slot == EquipmentSlotGroup.ANY ? null : slot.getExample();
     }
diff --git a/src/main/java/org/bukkit/entity/LivingEntity.java b/src/main/java/org/bukkit/entity/LivingEntity.java
index 5c29956c6db53440322330ff723c7087193641f1..a1e54e9d14393a6c0ea57cca854071c5396d9717 100644
--- a/src/main/java/org/bukkit/entity/LivingEntity.java
+++ b/src/main/java/org/bukkit/entity/LivingEntity.java
@@ -1447,4 +1447,15 @@ public interface LivingEntity extends Attributable, Damageable, ProjectileSource
      */
     void setBodyYaw(float bodyYaw);
     // Paper end - body yaw API
+
+    // Paper start - Expose canUseSlot
+    /**
+     * Checks whether this entity can use the equipment slot.
+     * <br>For example, not all entities may have {@link org.bukkit.inventory.EquipmentSlot#BODY}.
+     *
+     * @param slot equipment slot
+     * @return whether this entity can use the equipment slot
+     */
+    boolean canUseEquipmentSlot(org.bukkit.inventory.@NotNull EquipmentSlot slot);
+    // Paper end - Expose canUseSlot
 }
diff --git a/src/main/java/org/bukkit/inventory/EntityEquipment.java b/src/main/java/org/bukkit/inventory/EntityEquipment.java
index 1b34286fb6cbedb3841c84c499eb626f61885126..91cd0a918b640df7e75f6e40f3c6bd3689d4ff40 100644
--- a/src/main/java/org/bukkit/inventory/EntityEquipment.java
+++ b/src/main/java/org/bukkit/inventory/EntityEquipment.java
@@ -15,6 +15,8 @@ public interface EntityEquipment {
      *
      * @param slot the slot to put the ItemStack
      * @param item the ItemStack to set
+     * @throws IllegalArgumentException if the slot is invalid for the entity
+     * @see org.bukkit.entity.LivingEntity#canUseEquipmentSlot(EquipmentSlot)
      */
     public void setItem(@NotNull EquipmentSlot slot, @Nullable ItemStack item);
 
@@ -23,7 +25,9 @@ public interface EntityEquipment {
      *
      * @param slot the slot to put the ItemStack
      * @param item the ItemStack to set
-     * @param silent whether or not the equip sound should be silenced
+     * @param silent whether the equip sound should be silenced
+     * @throws IllegalArgumentException if the slot is invalid for the entity
+     * @see org.bukkit.entity.LivingEntity#canUseEquipmentSlot(EquipmentSlot)
      */
     public void setItem(@NotNull EquipmentSlot slot, @Nullable ItemStack item, boolean silent);
 
@@ -32,6 +36,8 @@ public interface EntityEquipment {
      *
      * @param slot the slot to get the ItemStack
      * @return the ItemStack in the given slot
+     * @throws IllegalArgumentException if the slot is invalid for the entity
+     * @see org.bukkit.entity.LivingEntity#canUseEquipmentSlot(EquipmentSlot)
      */
     @NotNull
     public ItemStack getItem(@NotNull EquipmentSlot slot);
diff --git a/src/main/java/org/bukkit/inventory/EquipmentSlotGroup.java b/src/main/java/org/bukkit/inventory/EquipmentSlotGroup.java
index 0019c8d91eefbfb44e76b9f929b25cd189295b79..5ce9da41ac4967f036e376fa270d4065b3d2e5d5 100644
--- a/src/main/java/org/bukkit/inventory/EquipmentSlotGroup.java
+++ b/src/main/java/org/bukkit/inventory/EquipmentSlotGroup.java
@@ -26,6 +26,7 @@ public final class EquipmentSlotGroup implements Predicate<EquipmentSlot> {
     public static final EquipmentSlotGroup CHEST = get("chest", EquipmentSlot.CHEST);
     public static final EquipmentSlotGroup HEAD = get("head", EquipmentSlot.HEAD);
     public static final EquipmentSlotGroup ARMOR = get("armor", (test) -> test == EquipmentSlot.FEET || test == EquipmentSlot.LEGS || test == EquipmentSlot.CHEST || test == EquipmentSlot.HEAD, EquipmentSlot.CHEST);
+    public static final EquipmentSlotGroup BODY = get("body", EquipmentSlot.BODY); // Paper - add missing slot group
     //
     private final String key;
     private final Predicate<EquipmentSlot> predicate;
diff --git a/src/main/java/org/bukkit/inventory/PlayerInventory.java b/src/main/java/org/bukkit/inventory/PlayerInventory.java
index 2c54660dc1fbc7c1232096797a23cae1262888e9..bcfcf963063e7c0fdc711febef2df2d0ff12776d 100644
--- a/src/main/java/org/bukkit/inventory/PlayerInventory.java
+++ b/src/main/java/org/bukkit/inventory/PlayerInventory.java
@@ -95,6 +95,8 @@ public interface PlayerInventory extends Inventory {
      * @param slot the slot to put the ItemStack
      * @param item the ItemStack to set
      *
+     * @throws IllegalArgumentException if the slot is invalid for the player
+     * @see org.bukkit.entity.LivingEntity#canUseEquipmentSlot(EquipmentSlot)
      * @see #setItem(int, ItemStack)
      */
     public void setItem(@NotNull EquipmentSlot slot, @Nullable ItemStack item);
@@ -105,6 +107,8 @@ public interface PlayerInventory extends Inventory {
      * @param slot the slot to get the ItemStack
      *
      * @return the ItemStack in the given slot
+     * @throws IllegalArgumentException if the slot is invalid for the player
+     * @see org.bukkit.entity.LivingEntity#canUseEquipmentSlot(EquipmentSlot)
      */
     @NotNull // Paper
     public ItemStack getItem(@NotNull EquipmentSlot slot);