added floodgate uuid check to bedrock utils

core/src/main/java/eu/mhsl/craftattack/spawn/core/util/server/Floodgate.java

@@ -5,21 +5,32 @@ import org.geysermc.cumulus.form.SimpleForm;
 import org.geysermc.floodgate.api.FloodgateApi;
 import org.geysermc.floodgate.api.player.FloodgatePlayer;
 
+import java.util.UUID;
 import java.util.function.Consumer;
 
 public class Floodgate {
-    private static final FloodgateApi instance = FloodgateApi.getInstance();
+    private static FloodgateApi api() {
+        return FloodgateApi.getInstance();
+    }
 
     public static boolean isBedrock(Player p) {
-        return instance.isFloodgatePlayer(p.getUniqueId());
+        return api().isFloodgatePlayer(p.getUniqueId());
+    }
+
+    /**
+     * Whether the UUID has the format Floodgate uses for Bedrock players (most significant bits zero).
+     * Works without the player being online and without the Floodgate API.
+     */
+    public static boolean isFloodgateUuid(UUID uuid) {
+        return uuid.getMostSignificantBits() == 0;
     }
 
     public static FloodgatePlayer getBedrockPlayer(Player p) {
-        return instance.getPlayer(p.getUniqueId());
+        return api().getPlayer(p.getUniqueId());
     }
 
     public static void runBedrockOnly(Player p, Consumer<FloodgatePlayer> callback) {
-        if(isBedrock(p)) callback.accept(instance.getPlayer(p.getUniqueId()));
+        if(isBedrock(p)) callback.accept(api().getPlayer(p.getUniqueId()));
     }
 
     public static void runJavaOnly(Player p, Consumer<Player> callback) {