Paper/patches/api/0073-Add-PlayerArmorChangeEvent.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: pkt77 <parkerkt77@gmail.com>
Date: Fri, 10 Nov 2017 23:45:59 -0500
Subject: [PATCH] Add PlayerArmorChangeEvent


diff --git a/src/main/java/com/destroystokyo/paper/event/player/PlayerArmorChangeEvent.java b/src/main/java/com/destroystokyo/paper/event/player/PlayerArmorChangeEvent.java
new file mode 100644
index 0000000000000000000000000000000000000000..e406ce639a2e88b78f82f25e71678a669d0a958b
--- /dev/null
+++ b/src/main/java/com/destroystokyo/paper/event/player/PlayerArmorChangeEvent.java
@@ -0,0 +1,137 @@
+package com.destroystokyo.paper.event.player;
+
+import org.bukkit.Material;
+import org.bukkit.entity.Player;
+import org.bukkit.event.HandlerList;
+import org.bukkit.event.player.PlayerEvent;
+import org.bukkit.inventory.ItemStack;
+
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.HashSet;
+import java.util.Set;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import static org.bukkit.Material.*;
+
+/**
+ * Called when the player themselves change their armor items
+ * <p>
+ * Not currently called for environmental factors though it <strong>MAY BE IN THE FUTURE</strong>
+ */
+public class PlayerArmorChangeEvent extends PlayerEvent {
+    private static final HandlerList HANDLERS = new HandlerList();
+
+    @NotNull private final SlotType slotType;
+    @Nullable private final ItemStack oldItem;
+    @Nullable private final ItemStack newItem;
+
+    public PlayerArmorChangeEvent(@NotNull Player player, @NotNull SlotType slotType, @Nullable ItemStack oldItem, @Nullable ItemStack newItem) {
+        super(player);
+        this.slotType = slotType;
+        this.oldItem = oldItem;
+        this.newItem = newItem;
+    }
+
+    /**
+     * Gets the type of slot being altered.
+     *
+     * @return type of slot being altered
+     */
+    @NotNull
+    public SlotType getSlotType() {
+        return this.slotType;
+    }
+
+    /**
+     * Gets the existing item that's being replaced
+     *
+     * @return old item
+     */
+    @Nullable
+    public ItemStack getOldItem() {
+        return this.oldItem;
+    }
+
+    /**
+     * Gets the new item that's replacing the old
+     *
+     * @return new item
+     */
+    @Nullable
+    public ItemStack getNewItem() {
+        return this.newItem;
+    }
+
+    @Override
+    public String toString() {
+        return "ArmorChangeEvent{" + "player=" + player + ", slotType=" + slotType + ", oldItem=" + oldItem + ", newItem=" + newItem + '}';
+    }
+
+    @NotNull
+    @Override
+    public HandlerList getHandlers() {
+        return HANDLERS;
+    }
+
+    @NotNull
+    public static HandlerList getHandlerList() {
+        return HANDLERS;
+    }
+
+    public enum SlotType {
+        HEAD(NETHERITE_HELMET, DIAMOND_HELMET, GOLDEN_HELMET, IRON_HELMET, CHAINMAIL_HELMET, LEATHER_HELMET, CARVED_PUMPKIN, PLAYER_HEAD, SKELETON_SKULL, ZOMBIE_HEAD, CREEPER_HEAD, WITHER_SKELETON_SKULL, TURTLE_HELMET),
+        CHEST(NETHERITE_CHESTPLATE, DIAMOND_CHESTPLATE, GOLDEN_CHESTPLATE, IRON_CHESTPLATE, CHAINMAIL_CHESTPLATE, LEATHER_CHESTPLATE, ELYTRA),
+        LEGS(NETHERITE_LEGGINGS, DIAMOND_LEGGINGS, GOLDEN_LEGGINGS, IRON_LEGGINGS, CHAINMAIL_LEGGINGS, LEATHER_LEGGINGS),
+        FEET(NETHERITE_BOOTS, DIAMOND_BOOTS, GOLDEN_BOOTS, IRON_BOOTS, CHAINMAIL_BOOTS, LEATHER_BOOTS);
+
+        private final Set<Material> mutableTypes = new HashSet<>();
+        private Set<Material> immutableTypes;
+
+        SlotType(Material... types) {
+            this.mutableTypes.addAll(Arrays.asList(types));
+        }
+
+        /**
+         * Gets an immutable set of all allowed material types that can be placed in an
+         * armor slot.
+         *
+         * @return immutable set of material types
+         */
+        @NotNull
+        public Set<Material> getTypes() {
+            if (immutableTypes == null) {
+                immutableTypes = Collections.unmodifiableSet(mutableTypes);
+            }
+
+            return immutableTypes;
+        }
+
+        /**
+         * Gets the type of slot via the specified material
+         *
+         * @param material material to get slot by
+         * @return slot type the material will go in, or null if it won't
+         */
+        @Nullable
+        public static SlotType getByMaterial(@NotNull Material material) {
+            for (SlotType slotType : values()) {
+                if (slotType.getTypes().contains(material)) {
+                    return slotType;
+                }
+            }
+            return null;
+        }
+
+        /**
+         * Gets whether or not this material can be equipped to a slot
+         *
+         * @param material material to check
+         * @return whether or not this material can be equipped
+         */
+        public static boolean isEquipable(@NotNull Material material) {
+            return getByMaterial(material) != null;
+        }
+    }
+}