Delete slimefun chunks/blocks when island is deleted.

pom.xml

@@ -314,6 +314,13 @@
             <version>${spigot.version}</version>
             <scope>provided</scope>
         </dependency>
+        <!-- Slimefun -->
+        <dependency>
+            <groupId>com.github.Slimefun</groupId>
+            <artifactId>Slimefun4</artifactId>
+            <version>RC-36</version>
+            <scope>provided</scope>
+        </dependency>
     </dependencies>
 
     <build>

src/main/java/world/bentobox/bentobox/BentoBox.java

@@ -24,6 +24,7 @@
 import world.bentobox.bentobox.database.DatabaseSetup;
 import world.bentobox.bentobox.hooks.MultiverseCoreHook;
 import world.bentobox.bentobox.hooks.MyWorldsHook;
+import world.bentobox.bentobox.hooks.SlimefunHook;
 import world.bentobox.bentobox.hooks.VaultHook;
 import world.bentobox.bentobox.hooks.placeholders.PlaceholderAPIHook;
 import world.bentobox.bentobox.listeners.BannedCommands;
@@ -231,6 +232,9 @@ private void completeSetup(long loadTime) {
         hooksManager.registerHook(new MyWorldsHook());
         islandWorldManager.registerWorldsToMultiverse(true);
 
+        // Register Slimefun
+        hooksManager.registerHook(new SlimefunHook());
+
         // TODO: re-enable after implementation
         //hooksManager.registerHook(new DynmapHook());
         // TODO: re-enable after rework

src/main/java/world/bentobox/bentobox/hooks/SlimefunHook.java

@@ -0,0 +1,50 @@
+/**
+ * 
+ */
+package world.bentobox.bentobox.hooks;
+
+import org.bukkit.Bukkit;
+import org.bukkit.Material;
+import org.bukkit.World;
+import org.bukkit.block.Block;
+
+import io.github.thebusybiscuit.slimefun4.implementation.Slimefun;
+import me.mrCookieSlime.Slimefun.api.BlockStorage;
+import world.bentobox.bentobox.api.hooks.Hook;
+
+/**
+ * Hook to enable slimefun blocks to be deleted when islands are deleted.
+ */
+public class SlimefunHook extends Hook {
+
+    private Slimefun sfPlugin;
+
+    public SlimefunHook() {
+        super("SlimeFun", Material.SLIME_BLOCK);
+    }
+
+    @Override
+    public boolean hook() {
+        // See if Slimefun is around
+        sfPlugin = (Slimefun) Bukkit.getPluginManager().getPlugin("SlimeFun");
+        return sfPlugin != null;
+    }
+
+    @Override
+    public String getFailureCause() {
+        return ""; // No errors
+    }
+
+    public void clearAllBlockInfoAtChunk(World world, int x, int z, boolean destroy) {
+        if (!BlockStorage.isWorldLoaded(world)) {
+            return; // Not sure if this is needed.
+        }
+        BlockStorage.clearAllBlockInfoAtChunk(world, x, z, destroy);
+    }
+
+    public void clearBlockInfo(Block b, boolean destroy) {
+        BlockStorage.clearBlockInfo(b, destroy);
+    }
+
+
+}

src/main/java/world/bentobox/bentobox/nms/CopyWorldRegenerator.java

@@ -38,6 +38,7 @@
 import world.bentobox.bentobox.BentoBox;
 import world.bentobox.bentobox.api.addons.GameModeAddon;
 import world.bentobox.bentobox.database.objects.IslandDeletion;
+import world.bentobox.bentobox.hooks.SlimefunHook;
 import world.bentobox.bentobox.util.MyBiomeGrid;
 
 /**
@@ -117,6 +118,11 @@ public CompletableFuture<Void> regenerateChunk(Chunk chunk) {
     }
 
     private CompletableFuture<Void> regenerateChunk(@Nullable IslandDeletion di, World world, int chunkX, int chunkZ) {
+
+        // Notify Slimefun
+        plugin.getHooks().getHook("Slimefun")
+                .ifPresent(sf -> ((SlimefunHook) sf).clearAllBlockInfoAtChunk(world, chunkX, chunkZ, true));
+
         CompletableFuture<Chunk> seedWorldFuture = getSeedWorldChunk(world, chunkX, chunkZ);
 
         // Set up a future to get the chunk requests using Paper's Lib. If Paper is used, this should be done async
@@ -324,6 +330,10 @@ private boolean isEnded(int chunkX) {
 
     @SuppressWarnings("deprecation")
     private CompletableFuture<Void> regenerateChunk(GameModeAddon gm, IslandDeletion di, World world, int chunkX, int chunkZ) {
+        // Notify Slimefun
+        plugin.getHooks().getHook("Slimefun")
+                .ifPresent(sf -> ((SlimefunHook) sf).clearAllBlockInfoAtChunk(world, chunkX, chunkZ, true));
+
         CompletableFuture<Chunk> chunkFuture = PaperLib.getChunkAtAsync(world, chunkX, chunkZ);
         CompletableFuture<Void> invFuture = chunkFuture.thenAccept(chunk ->
         Arrays.stream(chunk.getTileEntities()).filter(InventoryHolder.class::isInstance)

src/main/java/world/bentobox/bentobox/nms/SimpleWorldRegenerator.java

@@ -21,6 +21,7 @@
 import world.bentobox.bentobox.BentoBox;
 import world.bentobox.bentobox.api.addons.GameModeAddon;
 import world.bentobox.bentobox.database.objects.IslandDeletion;
+import world.bentobox.bentobox.hooks.SlimefunHook;
 import world.bentobox.bentobox.util.MyBiomeGrid;
 
 public abstract class SimpleWorldRegenerator implements WorldRegenerator {
@@ -90,6 +91,10 @@ private boolean isEnded(int chunkX) {
 
     @SuppressWarnings("deprecation")
     private CompletableFuture<Void> regenerateChunk(GameModeAddon gm, IslandDeletion di, World world, int chunkX, int chunkZ) {
+        // Notify Slimefun
+        plugin.getHooks().getHook("Slimefun")
+                .ifPresent(sf -> ((SlimefunHook) sf).clearAllBlockInfoAtChunk(world, chunkX, chunkZ, true));
+
         CompletableFuture<Chunk> chunkFuture = PaperLib.getChunkAtAsync(world, chunkX, chunkZ);
         CompletableFuture<Void> invFuture = chunkFuture.thenAccept(chunk ->
         Arrays.stream(chunk.getTileEntities()).filter(InventoryHolder.class::isInstance)