Some code cleanup

- Simplify MaskFilter slightly
- Improve thread safety of LocalBlockVectorSet
- Simplify if statement in SingleThreadQueueExtent
- Better error in MathMan#tripleSearchCoords for handling of the error in some cases

worldedit-core/src/main/java/com/fastasyncworldedit/core/extent/filter/MaskFilter.java

@@ -7,7 +7,6 @@ import com.sk89q.worldedit.function.mask.AbstractExtentMask;
 import com.sk89q.worldedit.function.mask.Mask;
 
 import java.util.concurrent.atomic.AtomicInteger;
-import java.util.function.Supplier;
 
 /**
  * Filter with an attached Mask used for deciding whether a block is eligible for being applied to.
@@ -16,25 +15,15 @@ import java.util.function.Supplier;
  */
 public class MaskFilter<T extends Filter> extends DelegateFilter<T> {
 
-    private final Supplier<Mask> supplier;
     private final Mask mask;
     private final AtomicInteger changes;
 
-    public MaskFilter(T other, Mask mask) {
+    public MaskFilter(T other, Mask root) {
-        this(other, () -> mask);
+        this(other, root, new AtomicInteger());
     }
 
-    public MaskFilter(T other, Supplier<Mask> supplier) {
+    public MaskFilter(T other, Mask root, AtomicInteger changes) {
-        this(other, supplier, supplier.get());
-    }
-
-    public MaskFilter(T other, Supplier<Mask> supplier, Mask root) {
-        this(other, supplier, root, new AtomicInteger());
-    }
-
-    public MaskFilter(T other, Supplier<Mask> supplier, Mask root, AtomicInteger changes) {
         super(other);
-        this.supplier = supplier;
         this.mask = root;
         this.changes = changes;
     }
@@ -63,12 +52,12 @@ public class MaskFilter<T extends Filter> extends DelegateFilter<T> {
 
     @Override
     public MaskFilter<?> newInstance(Filter other) {
-        return new MaskFilter<>(other, supplier);
+        return new MaskFilter<>(other, mask);
     }
 
     @Override
     public Filter fork() {
-        return new MaskFilter<>(getParent().fork(), mask::copy, mask.copy(), changes);
+        return new MaskFilter<>(getParent().fork(), mask.copy(), changes);
     }
 
 }

worldedit-core/src/main/java/com/fastasyncworldedit/core/math/LocalBlockVectorSet.java

@@ -17,8 +17,8 @@ import java.util.Set;
 public class LocalBlockVectorSet implements Set<BlockVector3> {
 
     private final SparseBitSet set;
-    private int offsetX;
+    private volatile int offsetX;
-    private int offsetZ;
+    private volatile int offsetZ;
 
     public LocalBlockVectorSet() {
         offsetX = offsetZ = Integer.MAX_VALUE;
@@ -211,7 +211,7 @@ public class LocalBlockVectorSet implements Set<BlockVector3> {
     }
 
     public boolean add(int x, int y, int z) {
-        if (offsetX == Integer.MAX_VALUE) {
+        if (offsetX == Integer.MAX_VALUE || offsetZ == Integer.MAX_VALUE) {
             offsetX = x;
             offsetZ = z;
         }

worldedit-core/src/main/java/com/fastasyncworldedit/core/queue/implementation/SingleThreadQueueExtent.java

@@ -305,8 +305,6 @@ public class SingleThreadQueueExtent extends ExtentBatchProcessorHolder implemen
             if (chunk != null) {
                 lastPair = pair;
                 lastChunk = chunk;
-            }
-            if (chunk != null) {
                 return chunk;
             }
             final int size = chunks.size();

worldedit-core/src/main/java/com/fastasyncworldedit/core/util/MathMan.java

@@ -201,7 +201,7 @@ public class MathMan {
      */
     public static int tripleSearchCoords(int x, int y, int z) {
         if (x > 1023 || x < -1024 || y > 255 || y < -256 || z > 1023 || z < -1024) {
-            throw new IndexOutOfBoundsException(String.format("Check range on x=%s, y=%s and z=%s!", x, y, z));
+            throw new UnsupportedOperationException(String.format("Check range on x=%s, y=%s and z=%s!", x, y, z));
         }
         int b1 = Math.abs(y) & 0xff;
         int b3 = x & 0xff;