Cleanup code for latest Java versions

worldedit-core/src/main/java/com/sk89q/worldedit/EditSession.java

@@ -752,16 +752,12 @@ public int getHighestTerrainBlock(int x, int z, int minY, int maxY, Mask filter)
      * @throws WorldEditException thrown on a set error
      */
     public <B extends BlockStateHolder<B>> boolean setBlock(BlockVector3 position, B block, Stage stage) throws WorldEditException {
-        switch (stage) {
-            case BEFORE_HISTORY:
-                return bypassNone.setBlock(position, block);
-            case BEFORE_CHANGE:
-                return bypassHistory.setBlock(position, block);
-            case BEFORE_REORDER:
-                return bypassReorderHistory.setBlock(position, block);
-            default:
-                throw new RuntimeException("New enum entry added that is unhandled here");
-        }
+        return switch (stage) {
+            case BEFORE_HISTORY -> bypassNone.setBlock(position, block);
+            case BEFORE_CHANGE -> bypassHistory.setBlock(position, block);
+            case BEFORE_REORDER -> bypassReorderHistory.setBlock(position, block);
+            default -> throw new RuntimeException("New enum entry added that is unhandled here");
+        };
     }
 
     /**
@@ -2519,8 +2515,8 @@ public int hollowOutRegion(Region region, int thickness, Pattern pattern) throws
             }
         }
 
+        final Set<BlockVector3> newOutside = new HashSet<>();
         for (int i = 1; i < thickness; ++i) {
-            final Set<BlockVector3> newOutside = new HashSet<>();
             outer: for (BlockVector3 position : region) {
                 for (BlockVector3 recurseDirection : recurseDirections) {
                     BlockVector3 neighbor = position.add(recurseDirection);
@@ -2533,6 +2529,7 @@ public int hollowOutRegion(Region region, int thickness, Pattern pattern) throws
             }
 
             outside.addAll(newOutside);
+            newOutside.clear();
         }
 
         outer: for (BlockVector3 position : region) {
@@ -2691,14 +2688,6 @@ public int drawSpline(Pattern pattern, List<BlockVector3> nodevectors, double te
         return setBlocks(vset, pattern);
     }
 
-    private static double hypotSquare(double... pars) {
-        double sum = 0;
-        for (double d : pars) {
-            sum += Math.pow(d, 2);
-        }
-        return sum;
-    }
-
     private static Set<BlockVector3> getBallooned(Set<BlockVector3> vset, double radius) {
         Set<BlockVector3> returnset = new HashSet<>();
         int ceilrad = (int) Math.ceil(radius);
@@ -2712,7 +2701,7 @@ private static Set<BlockVector3> getBallooned(Set<BlockVector3> vset, double rad
             for (int loopx = tipx - ceilrad; loopx <= tipx + ceilrad; loopx++) {
                 for (int loopy = tipy - ceilrad; loopy <= tipy + ceilrad; loopy++) {
                     for (int loopz = tipz - ceilrad; loopz <= tipz + ceilrad; loopz++) {
-                        if (hypotSquare(loopx - tipx, loopy - tipy, loopz - tipz) <= radiusSquare) {
+                        if (lengthSq(loopx - tipx, loopy - tipy, loopz - tipz) <= radiusSquare) {
                             returnset.add(BlockVector3.at(loopx, loopy, loopz));
                         }
                     }

worldedit-core/src/main/java/com/sk89q/worldedit/EditSessionFactory.java

@@ -24,8 +24,6 @@
 import com.sk89q.worldedit.extent.inventory.BlockBag;
 import com.sk89q.worldedit.world.World;
 
-import static com.google.common.base.Preconditions.checkNotNull;
-
 /**
  * Creates new {@link EditSession}s. To get an instance of this factory,
  * use {@link WorldEdit#getEditSessionFactory()}.

worldedit-core/src/main/java/com/sk89q/worldedit/LocalSession.java

@@ -962,9 +962,7 @@ public void dispatchCUISelection(Actor actor) {
             return;
         }
 
-        if (selector instanceof CUIRegion) {
-            CUIRegion tempSel = (CUIRegion) selector;
-
+        if (selector instanceof CUIRegion tempSel) {
             if (tempSel.getProtocolVersion() > cuiVersion) {
                 actor.dispatchCUIEvent(new SelectionShapeEvent(tempSel.getLegacyTypeID()));
                 tempSel.describeLegacyCUI(this, actor);
@@ -988,9 +986,7 @@ public void describeCUI(Actor actor) {
             return;
         }
 
-        if (selector instanceof CUIRegion) {
-            CUIRegion tempSel = (CUIRegion) selector;
-
+        if (selector instanceof CUIRegion tempSel) {
             if (tempSel.getProtocolVersion() > cuiVersion) {
                 tempSel.describeLegacyCUI(this, actor);
             } else {

worldedit-core/src/main/java/com/sk89q/worldedit/WorldEdit.java

@@ -736,7 +736,7 @@ public void runScript(Player player, File f, String[] args) throws WorldEditExce
             byte[] data = new byte[in.available()];
             in.readFully(data);
             in.close();
-            script = new String(data, 0, data.length, StandardCharsets.UTF_8);
+            script = new String(data, StandardCharsets.UTF_8);
         } catch (IOException e) {
             player.printError(TranslatableComponent.of("worldedit.script.read-error", TextComponent.of(e.getMessage())));
             return;

worldedit-core/src/main/java/com/sk89q/worldedit/command/ClipboardCommands.java

@@ -43,7 +43,6 @@
 import com.sk89q.worldedit.math.Vector3;
 import com.sk89q.worldedit.math.transform.AffineTransform;
 import com.sk89q.worldedit.regions.Region;
-import com.sk89q.worldedit.regions.RegionSelector;
 import com.sk89q.worldedit.regions.selector.CuboidRegionSelector;
 import com.sk89q.worldedit.regions.selector.ExtendingCuboidRegionSelector;
 import com.sk89q.worldedit.session.ClipboardHolder;

worldedit-core/src/main/java/com/sk89q/worldedit/command/RegionCommands.java

@@ -167,13 +167,12 @@ public int curve(Actor actor, EditSession editSession,
                          int thickness,
                      @Switch(name = 'h', desc = "Generate only a shell")
                          boolean shell) throws WorldEditException {
-        if (!(region instanceof ConvexPolyhedralRegion)) {
+        if (!(region instanceof ConvexPolyhedralRegion cpregion)) {
             actor.printError(TranslatableComponent.of("worldedit.curve.invalid-type"));
             return 0;
         }
         checkCommandArgument(thickness >= 0, "Thickness must be >= 0");
 
-        ConvexPolyhedralRegion cpregion = (ConvexPolyhedralRegion) region;
         List<BlockVector3> vectors = new ArrayList<>(cpregion.getVertices());
 
         int blocksChanged = editSession.drawSpline(pattern, vectors, 0, 0, 0, 10, thickness, !shell);

worldedit-core/src/main/java/com/sk89q/worldedit/command/SnapshotCommands.java

@@ -125,8 +125,7 @@ void list(Actor actor, World world,
                 TextComponent.of(world.getName())
             ));
 
-            if (config.snapshotDatabase instanceof FileSystemSnapshotDatabase) {
-                FileSystemSnapshotDatabase db = (FileSystemSnapshotDatabase) config.snapshotDatabase;
+            if (config.snapshotDatabase instanceof FileSystemSnapshotDatabase db) {
                 Path root = db.getRoot();
                 if (Files.isDirectory(root)) {
                     WorldEdit.logger.info("No snapshots were found for world '"

worldedit-core/src/main/java/com/sk89q/worldedit/command/SnapshotUtilCommands.java

@@ -82,7 +82,7 @@ public void restore(Actor actor, World world, LocalSession session, EditSession
         if (snapshotName != null) {
             URI uri = resolveSnapshotName(config, snapshotName);
             Optional<Snapshot> snapOpt = config.snapshotDatabase.getSnapshot(uri);
-            if (!snapOpt.isPresent()) {
+            if (snapOpt.isEmpty()) {
                 actor.printError(TranslatableComponent.of("worldedit.restore.not-available"));
                 return;
             }

worldedit-core/src/main/java/com/sk89q/worldedit/command/tool/brush/SnowSmoothBrush.java

@@ -30,7 +30,6 @@
 import com.sk89q.worldedit.math.convolution.SnowHeightMap;
 import com.sk89q.worldedit.regions.CuboidRegion;
 import com.sk89q.worldedit.regions.Region;
-import com.sk89q.worldedit.util.Location;
 
 import javax.annotation.Nullable;
 

worldedit-core/src/main/java/com/sk89q/worldedit/command/util/PrintCommandHelp.java

@@ -139,7 +139,7 @@ private static void printCommands(int page, Stream<Command> commandStream, Actor
         List<Command> commands = commandStream
             .filter(command -> command.getCondition().satisfied(store))
             .sorted(byCleanName())
-            .collect(toList());
+            .toList();
 
         String used = commandList.isEmpty() ? null : toCommandString(commandList);
         CommandListBox box = new CommandListBox(

worldedit-core/src/main/java/com/sk89q/worldedit/command/util/SuggestionHelper.java

@@ -25,7 +25,6 @@
 import com.sk89q.worldedit.registry.state.Property;
 import com.sk89q.worldedit.world.block.BlockCategory;
 import com.sk89q.worldedit.world.block.BlockType;
-import com.sk89q.worldedit.world.block.BlockTypes;
 
 import java.util.Arrays;
 import java.util.HashSet;

worldedit-core/src/main/java/com/sk89q/worldedit/extension/factory/MaskFactory.java

@@ -116,14 +116,12 @@ public Mask parseFromInput(String input, ParserContext context) throws InputPars
             masks.add(match);
         }
 
-        switch (masks.size()) {
-            case 0:
+        return switch (masks.size()) {
+            case 0 ->
                 throw new NoMatchException(TranslatableComponent.of("worldedit.error.no-match", TextComponent.of(input)));
-            case 1:
-                return masks.get(0);
-            default:
-                return new MaskIntersection(masks);
-        }
+            case 1 -> masks.get(0);
+            default -> new MaskIntersection(masks);
+        };
     }
 
 }

worldedit-core/src/main/java/com/sk89q/worldedit/extension/platform/AbstractPlayerActor.java

@@ -519,10 +519,9 @@ public void dispatchCUIEvent(CUIEvent event) {
 
     @Override
     public boolean equals(Object other) {
-        if (!(other instanceof Player)) {
+        if (!(other instanceof Player other2)) {
             return false;
         }
-        Player other2 = (Player) other;
         return other2.getName().equals(getName());
     }
 

worldedit-core/src/main/java/com/sk89q/worldedit/extension/platform/PlatformManager.java

@@ -258,9 +258,7 @@ public World getWorldForEditing(World base) {
     public <T extends Actor> T createProxyActor(T base) {
         checkNotNull(base);
 
-        if (base instanceof Player) {
-            Player player = (Player) base;
-
+        if (base instanceof Player player) {
             Player permActor = queryCapability(Capability.PERMISSIONS).matchPlayer(player);
             if (permActor == null) {
                 permActor = player;
@@ -361,10 +359,9 @@ public void handleBlockInteract(BlockInteractEvent event) {
         Location location = event.getLocation();
 
         // At this time, only handle interaction from players
-        if (!(actor instanceof Player)) {
+        if (!(actor instanceof Player player)) {
             return;
         }
-        Player player = (Player) actor;
         LocalSession session = worldEdit.getSessionManager().get(actor);
 
         Request.reset();

worldedit-core/src/main/java/com/sk89q/worldedit/extent/clipboard/BlockArrayClipboard.java

@@ -19,7 +19,6 @@
 
 package com.sk89q.worldedit.extent.clipboard;
 
-import com.sk89q.worldedit.WorldEditException;
 import com.sk89q.worldedit.entity.BaseEntity;
 import com.sk89q.worldedit.entity.Entity;
 import com.sk89q.worldedit.function.operation.Operation;