avoid quadratic overhead for UUID collection

Bukkit/src/main/java/com/plotsquared/bukkit/BukkitPlatform.java

@@ -656,20 +656,15 @@ public final class BukkitPlatform extends JavaPlugin implements Listener, PlotPl
             final @NonNull SQLiteUUIDService sqLiteUUIDService,
             final @NonNull CacheUUIDService cacheUUIDService
     ) {
-        // Load all uuids into a big chunky boi queue
-        final Queue<UUID> uuidQueue = new LinkedBlockingQueue<>();
+        // Record all unique UUID's and put them into a queue
+        final Set<UUID> uuidSet = new HashSet<>();
         PlotSquared.get().forEachPlotRaw(plot -> {
-            final Set<UUID> uuids = new HashSet<>();
-            uuids.add(plot.getOwnerAbs());
-            uuids.addAll(plot.getMembers());
-            uuids.addAll(plot.getTrusted());
-            uuids.addAll(plot.getDenied());
-            for (final UUID uuid : uuids) {
-                if (!uuidQueue.contains(uuid)) {
-                    uuidQueue.add(uuid);
-                }
-            }
+            uuidSet.add(plot.getOwnerAbs());
+            uuidSet.addAll(plot.getMembers());
+            uuidSet.addAll(plot.getTrusted());
+            uuidSet.addAll(plot.getDenied());
         });
+        final Queue<UUID> uuidQueue = new LinkedBlockingQueue<>(uuidSet);
 
         LOGGER.info("(UUID) {} UUIDs will be cached", uuidQueue.size());
 

Bukkit/src/main/java/com/plotsquared/bukkit/listener/BlockEventListener.java

@@ -121,23 +121,6 @@ public class BlockEventListener implements Listener {
             Material.TURTLE_EGG,
             Material.TURTLE_SPAWN_EGG
     );
-    private static final Set<Material> SNOW;  // needed as Tag.SNOW isn't present in 1.16.5
-
-    static {
-        if (PlotSquared.platform().serverVersion()[1] < 17) {
-            SNOW = Set.of(
-                    Material.SNOW,
-                    Material.SNOW_BLOCK
-            );
-        } else {
-            SNOW = Set.of(
-                    Material.SNOW,
-                    Material.SNOW_BLOCK,
-                    Material.POWDER_SNOW // only since 1.17
-            );
-        }
-    }
-
     private final PlotAreaManager plotAreaManager;
     private final WorldEdit worldEdit;
 
@@ -546,7 +529,7 @@ public class BlockEventListener implements Listener {
             event.setCancelled(true);
             return;
         }
-        if (SNOW.contains(event.getNewState().getType())) {
+        if (Tag.SNOW.isTagged(event.getNewState().getType())) {
             if (!plot.getFlag(SnowFormFlag.class)) {
                 plot.debug("Snow could not form because snow-form = false");
                 event.setCancelled(true);
@@ -578,7 +561,7 @@ public class BlockEventListener implements Listener {
             return;
         }
         Class<? extends BooleanFlag<?>> flag;
-        if (SNOW.contains(event.getNewState().getType())) {
+        if (Tag.SNOW.isTagged(event.getNewState().getType())) {
             flag = SnowFormFlag.class;
         } else if (Tag.ICE.isTagged(event.getNewState().getType())) {
             flag = IceFormFlag.class;
@@ -695,7 +678,7 @@ public class BlockEventListener implements Listener {
             }
             return;
         }
-        if (SNOW.contains(blockType)) {
+        if (Tag.SNOW.isTagged(blockType)) {
             if (!plot.getFlag(SnowMeltFlag.class)) {
                 plot.debug("Snow could not melt because snow-melt = false");
                 event.setCancelled(true);