Optimizes portal entrance lookup

README.md

@@ -532,7 +532,8 @@ portalInfoServer=Server: %server%
 #### \[Version 0.11.5.8] Unified Legacy Fork
 
 - Cleaned up handling of invalid gate files during both migration and startup.
-- Backported the rewrite's translation system to legacy: to add new localisations, please use [this page](https://sgrewritten.org/translate).
+- Backported the rewrite's translation system to legacy: to add new localisations, please
+  use [this page](https://sgrewritten.org/translate).
 - Updated various dependencies.
 - Optimisations in the migrator as to mitigate issues associated with importing large past deployments.
 - Improved handling of some potential error states involving Floodgate and Geyser.

src/main/java/net/knarcraft/stargate/portal/PortalHandler.java

@@ -302,7 +302,7 @@ public class PortalHandler {
         if (location.getWorld() == null) {
             return null;
         }
-        return PortalRegistry.getLookupEntrances().get(new BlockLocation(location.getWorld(), location.getBlockX(),
+        return PortalRegistry.getPortalFromEntrance(new BlockLocation(location.getWorld(), location.getBlockX(),
                 location.getBlockY(), location.getBlockZ()));
     }
 
@@ -314,7 +314,7 @@ public class PortalHandler {
      */
     @Nullable
     public static Portal getByEntrance(@NotNull Block block) {
-        return PortalRegistry.getLookupEntrances().get(new BlockLocation(block));
+        return PortalRegistry.getPortalFromEntrance(new BlockLocation(block));
     }
 
     /**
@@ -355,7 +355,7 @@ public class PortalHandler {
         }
 
         for (BlockLocation adjacentPosition : adjacentPositions) {
-            Portal portal = PortalRegistry.getLookupEntrances().get(adjacentPosition);
+            Portal portal = PortalRegistry.getPortalFromEntrance(adjacentPosition);
             if (portal != null) {
                 return portal;
             }

src/main/java/net/knarcraft/stargate/portal/PortalRegistry.java

@@ -6,6 +6,7 @@ import net.knarcraft.stargate.container.BlockLocation;
 import net.knarcraft.stargate.utility.PortalFileHelper;
 import org.bukkit.World;
 import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
 
 import java.util.ArrayList;
 import java.util.HashMap;
@@ -124,13 +125,13 @@ public class PortalRegistry {
     }
 
     /**
-     * Gets a copy of all portal entrances available for lookup
+     * Gets a portal from the location of a possible entrance
      *
-     * @return <p>A copy of all entrances to portal mappings</p>
+     * @return <p>A portal, or null</p>
      */
-    @NotNull
+    @Nullable
-    public static Map<BlockLocation, Portal> getLookupEntrances() {
+    public static Portal getPortalFromEntrance(@NotNull BlockLocation blockLocation) {
-        return new HashMap<>(lookupEntrances);
+        return lookupEntrances.get(blockLocation);
     }
 
     /**