Add get world and registries

java/patchbukkit/src/main/java/org/patchbukkit/bridge/NativePatchBukkit.java

@@ -182,7 +182,9 @@ public class NativePatchBukkit {
         long registerEventAddr,
         long getAbilitiesAddr,
         long setAbilitiesAddr,
-        long getLocationAddr
+        long getLocationAddr,
+        long freeStringAddr,
+        long getWorldAddr
     ) {
         // void rust_send_message(const char* uuid, const char* message)
         sendMessageNative = LINKER.downcallHandle(

java/patchbukkit/src/main/java/org/patchbukkit/entity/PatchBukkitEntity.java

@@ -38,6 +38,7 @@ import org.bukkit.util.Vector;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 import org.patchbukkit.bridge.NativePatchBukkit;
+import org.patchbukkit.world.PatchBukkitWorld;
 
 import io.papermc.paper.datacomponent.DataComponentType;
 import io.papermc.paper.datacomponent.DataComponentType.Valued;
@@ -319,8 +320,11 @@ public class PatchBukkitEntity implements Entity {
 
     @Override
     public @NotNull World getWorld() {
-        // TODO Auto-generated method stub
-        throw new UnsupportedOperationException("Unimplemented method 'getWorld'");
+        var world_uuid_str = NativePatchBukkit.getWorld(this.uuid);
+        UUID world_uuid = UUID.fromString(world_uuid_str);
+        var world = PatchBukkitWorld.getOrCreate(world_uuid);
+
+        return world;
     }
 
     @Override

java/patchbukkit/src/main/java/org/patchbukkit/registry/PatchBukkitRegistryAccess.java

@@ -0,0 +1,22 @@
+package org.patchbukkit.registry;
+
+import io.papermc.paper.registry.RegistryAccess;
+import io.papermc.paper.registry.RegistryKey;
+import org.bukkit.Keyed;
+import org.bukkit.Registry;
+import org.jspecify.annotations.Nullable;
+
+public class PatchBukkitRegistryAccess implements RegistryAccess {
+
+    @Override
+    public <T extends Keyed> @Nullable Registry<T> getRegistry(Class<T> type) {
+        // TODO Auto-generated method stub
+        throw new UnsupportedOperationException("Unimplemented method 'getRegistry'");
+    }
+
+    @Override
+    public <T extends Keyed> Registry<T> getRegistry(RegistryKey<T> registryKey) {
+        // TODO Auto-generated method stub
+        throw new UnsupportedOperationException("Unimplemented method 'getRegistry'");
+    }
+}

java/patchbukkit/src/main/java/org/patchbukkit/world/PatchBukkitWorld.java

@@ -33,6 +33,17 @@ public class PatchBukkitWorld
     extends PatchBukkitRegionAccessor
     implements World
 {
+    private static final Map<UUID, PatchBukkitWorld> instances = new HashMap<>();
+    private UUID uuid;
+
+    private PatchBukkitWorld(UUID uuid) {
+        this.uuid = uuid;
+    }
+
+    public static PatchBukkitWorld getOrCreate(UUID uuid) {
+        return instances.computeIfAbsent(uuid, PatchBukkitWorld::new);
+    }
+
 
     @Override
     public boolean isVoidDamageEnabled() {

java/patchbukkit/src/main/resources/META-INF/services/io.papermc.paper.registry.RegistryAccess

@@ -0,0 +1 @@
+org.patchbukkit.registry.PatchBukkitRegistryAccess