ISPN-9293 Convert Set<Integer> places to IntSet where appropriate

commons/src/main/java/org/infinispan/commons/util/AbstractImmutableIntSet.java

@@ -0,0 +1,84 @@
+package org.infinispan.commons.util;
+
+import java.util.Collection;
+import java.util.function.IntPredicate;
+import java.util.function.Predicate;
+
+/**
+ * Abstract IntSet that throws an {@link UnsupportedOperationException} for all write operations on an IntSet.
+ * <p>
+ * It is up to implementors to ensure that {@link java.util.PrimitiveIterator.OfInt#remove()} throws the same exception.
+ * @author wburns
+ * @since 9.3
+ */
+abstract class AbstractImmutableIntSet implements IntSet {
+   @Override
+   public boolean add(int i) {
+      throw new UnsupportedOperationException();
+   }
+
+   @Override
+   public void set(int i) {
+      throw new UnsupportedOperationException();
+   }
+
+   @Override
+   public boolean remove(int i) {
+      throw new UnsupportedOperationException();
+   }
+
+   @Override
+   public boolean remove(Object o) {
+      throw new UnsupportedOperationException();
+   }
+
+   @Override
+   public boolean removeAll(IntSet set) {
+      throw new UnsupportedOperationException();
+   }
+
+   @Override
+   public boolean removeAll(Collection<?> c) {
+      throw new UnsupportedOperationException();
+   }
+
+   @Override
+   public boolean retainAll(IntSet c) {
+      throw new UnsupportedOperationException();
+   }
+
+   @Override
+   public boolean retainAll(Collection<?> c) {
+      throw new UnsupportedOperationException();
+   }
+
+   @Override
+   public boolean add(Integer integer) {
+      throw new UnsupportedOperationException();
+   }
+
+   @Override
+   public boolean addAll(IntSet set) {
+      throw new UnsupportedOperationException();
+   }
+
+   @Override
+   public boolean addAll(Collection<? extends Integer> c) {
+      throw new UnsupportedOperationException();
+   }
+
+   @Override
+   public void clear() {
+      throw new UnsupportedOperationException();
+   }
+
+   @Override
+   public boolean removeIf(Predicate<? super Integer> filter) {
+      throw new UnsupportedOperationException();
+   }
+
+   @Override
+   public boolean removeIf(IntPredicate filter) {
+      throw new UnsupportedOperationException();
+   }
+}