Add whitelist events

paper-api/src/main/java/io/papermc/paper/event/server/WhitelistStateUpdateEvent.java

@@ -0,0 +1,83 @@
+package io.papermc.paper.event.server;
+
+import com.destroystokyo.paper.profile.PlayerProfile;
+import org.bukkit.Bukkit;
+import org.bukkit.OfflinePlayer;
+import org.bukkit.event.Cancellable;
+import org.bukkit.event.Event;
+import org.bukkit.event.HandlerList;
+import org.jetbrains.annotations.ApiStatus;
+import org.jspecify.annotations.NullMarked;
+
+/**
+ * This event gets called when the whitelist status of a player is changed
+ */
+@NullMarked
+public class WhitelistStateUpdateEvent extends Event implements Cancellable {
+
+    private static final HandlerList HANDLER_LIST = new HandlerList();
+
+    private final PlayerProfile playerProfile;
+    private final WhitelistStatus status;
+
+    private boolean cancelled;
+
+    @ApiStatus.Internal
+    public WhitelistStateUpdateEvent(final PlayerProfile playerProfile, final WhitelistStatus status) {
+        this.playerProfile = playerProfile;
+        this.status = status;
+    }
+
+    /**
+     * Gets the player whose whitelist status is being changed
+     *
+     * @return the player whose status is being changed
+     */
+    public OfflinePlayer getPlayer() {
+        return Bukkit.getOfflinePlayer(this.playerProfile.getId());
+    }
+
+    /**
+     * Gets the player profile whose whitelist status is being changed
+     *
+     * @return the player profile whose status is being changed
+     */
+    public PlayerProfile getPlayerProfile() {
+        return this.playerProfile;
+    }
+
+    /**
+     * Gets the status change of the player profile
+     *
+     * @return the whitelist status
+     */
+    public WhitelistStatus getStatus() {
+        return this.status;
+    }
+
+    @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;
+    }
+
+    /**
+     * Enum for the whitelist status changes
+     */
+    public enum WhitelistStatus {
+        ADDED, REMOVED
+    }
+}