move small patches

divinemc-server/src/main/java/space/bxteam/divinemc/util/c2me/ObjectCachingUtils.java

@@ -0,0 +1,20 @@
+package space.bxteam.divinemc.util.c2me;
+
+import it.unimi.dsi.fastutil.ints.Int2ObjectOpenHashMap;
+
+import java.util.BitSet;
+import java.util.function.IntFunction;
+
+public class ObjectCachingUtils {
+    private static final IntFunction<BitSet> bitSetConstructor = BitSet::new;
+
+    public static ThreadLocal<Int2ObjectOpenHashMap<BitSet>> BITSETS = ThreadLocal.withInitial(Int2ObjectOpenHashMap::new);
+
+    private ObjectCachingUtils() {}
+
+    public static BitSet getCachedOrNewBitSet(int bits) {
+        final BitSet bitSet = BITSETS.get().computeIfAbsent(bits, bitSetConstructor);
+        bitSet.clear();
+        return bitSet;
+    }
+}