Add EquipmentSlot convenience methods (#8477)

patches/api/Add-EquipmentSlot-convenience-methods.patch

@@ -0,0 +1,39 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: SoSeDiK <mrsosedik@gmail.com>
+Date: Sun, 16 Oct 2022 15:28:49 +0300
+Subject: [PATCH] Add EquipmentSlot convenience methods
+
+
+diff --git a/src/main/java/org/bukkit/inventory/EquipmentSlot.java b/src/main/java/org/bukkit/inventory/EquipmentSlot.java
+index 0000000000000000000000000000000000000000..0000000000000000000000000000000000000000 100644
+--- a/src/main/java/org/bukkit/inventory/EquipmentSlot.java
++++ b/src/main/java/org/bukkit/inventory/EquipmentSlot.java
+@@ -0,0 +0,0 @@ public enum EquipmentSlot {
+     LEGS,
+     CHEST,
+     HEAD
++    // Paper start
++    ;
++    /**
++     * Checks whether this equipment slot is a hand:
++     * either {@link #HAND} or {@link #OFF_HAND}
++     *
++     * @return whether this is a hand slot
++     */
++    public boolean isHand() {
++        return this == HAND || this == OFF_HAND;
++    }
++
++    /**
++     * Checks whether this equipment slot
++     * is one of the armor slots:
++     * {@link #HEAD}, {@link #CHEST},
++     * {@link #LEGS}, or {@link #FEET}
++     *
++     * @return whether this is an armor slot
++     */
++    public boolean isArmor() {
++        return this == HEAD || this == CHEST || this == LEGS || this == FEET;
++    }
++    // Paper end
+ }

patches/api/Add-LivingEntity-swingHand-EquipmentSlot-convenience.patch

@@ -23,7 +23,7 @@ index 0000000000000000000000000000000000000000..00000000000000000000000000000000
 +     * @throws IllegalArgumentException if invalid hand is passed
 +     */
 +    default void swingHand(@NotNull org.bukkit.inventory.EquipmentSlot hand) {
-+        com.google.common.base.Preconditions.checkArgument(hand == org.bukkit.inventory.EquipmentSlot.HAND || hand == org.bukkit.inventory.EquipmentSlot.OFF_HAND, String.format("Expected a valid hand, got \"%s\" instead!", hand));
++        com.google.common.base.Preconditions.checkArgument(hand != null && hand.isHand(), String.format("Expected a valid hand, got \"%s\" instead!", hand));
 +        if (hand == org.bukkit.inventory.EquipmentSlot.HAND) {
 +            this.swingMainHand();
 +        } else {