优化一对一列表实现

core/src/main/java/net/momirealms/craftengine/core/util/IntIdentityList.java

@@ -1,22 +1,16 @@
 package net.momirealms.craftengine.core.util;
 
-import it.unimi.dsi.fastutil.ints.IntArrayList;
 import org.jetbrains.annotations.NotNull;
 import org.jetbrains.annotations.Nullable;
 
 import java.util.Iterator;
-import java.util.List;
+import java.util.NoSuchElementException;
 
 public class IntIdentityList implements IndexedIterable<Integer> {
     private final int size;
-    private final List<Integer> list;
 
     public IntIdentityList(int size) {
         this.size = size;
-        list = new IntArrayList(size);
-        for (int i = 0; i < size; i++) {
-            list.add(i);
-        }
     }
 
     @Override
@@ -36,6 +30,29 @@ public class IntIdentityList implements IndexedIterable<Integer> {
 
     @Override
     public @NotNull Iterator<Integer> iterator() {
-        return list.iterator();
+        return new IntIterator(size);
     }
-}
+
+    private static class IntIterator implements Iterator<Integer> {
+        private final int size;
+        private int current;
+
+        public IntIterator(int size) {
+            this.size = size;
+            this.current = 0;
+        }
+
+        @Override
+        public boolean hasNext() {
+            return current < size;
+        }
+
+        @Override
+        public Integer next() {
+            if (!hasNext()) {
+                throw new NoSuchElementException();
+            }
+            return current++;
+        }
+    }
+}

core/src/main/java/net/momirealms/craftengine/core/world/chunk/packet/MCSection.java

@@ -9,7 +9,7 @@ public class MCSection {
     private short nonEmptyBlockCount;
     private final PalettedContainer<Integer> serverBlockStateContainer;
     private final IndexedIterable<Integer> clientBlockStateList;
-    private ReadableContainer<Integer> biomeContainer;
+    private PalettedContainer<Integer> biomeContainer;
 
     public MCSection(IndexedIterable<Integer> clientBlockStateList, IndexedIterable<Integer> serverBlockStateList, IndexedIterable<Integer> biomeList) {
         this.serverBlockStateContainer = new PalettedContainer<>(serverBlockStateList, 0, PalettedContainer.PaletteProvider.BLOCK_STATE);
@@ -42,4 +42,8 @@ public class MCSection {
     public PalettedContainer<Integer> blockStateContainer() {
         return serverBlockStateContainer;
     }
+
+    public PalettedContainer<Integer> biomeContainer() {
+        return biomeContainer;
+    }
 }