@SuppressWarnings("serial") // uses writeReplace(), not default serialization
@ElementTypesAreNonnullByDefault
final class SingletonImmutableBiMap<K, V> extends ImmutableBiMap<K, V> {

  final transient K singleKey;
  final transient V singleValue;

  SingletonImmutableBiMap(K singleKey, V singleValue) {
    checkEntryNotNull(singleKey, singleValue);
    this.singleKey = singleKey;
    this.singleValue = singleValue;

      new RegularImmutableSet<>(EMPTY_ARRAY, 0, EMPTY_ARRAY, 0);

  private final transient Object[] elements;
  private final transient int hashCode;
  // the same values as `elements` in hashed positions (plus nulls)
  @VisibleForTesting final transient @Nullable Object[] table;
  // 'and' with an int to get a valid table index.
  private final transient int mask;

 */
package org.apache.maven.toolchain.model;

import java.io.Serializable;

import static java.util.Objects.requireNonNull;

public abstract class BaseObject implements Serializable, Cloneable {
    protected transient ChildrenTracking childrenTracking;

    protected Object delegate;

    public BaseObject() {}

    public BaseObject(Object delegate, BaseObject parent) {

  static final double MAX_LOAD_FACTOR = 1.2;

  @CheckForNull private final transient @Nullable ImmutableMapEntry<K, V>[] keyTable;
  @CheckForNull private final transient @Nullable ImmutableMapEntry<K, V>[] valueTable;
  @VisibleForTesting final transient Entry<K, V>[] entries;
  private final transient int mask;
  private final transient int hashCode;

  static <K, V> ImmutableBiMap<K, V> fromEntries(Entry<K, V>... entries) {

      extends SynchronizedObject implements Multimap<K, V> {
    @CheckForNull transient Set<K> keySet;
    @CheckForNull transient Collection<V> valuesCollection;
    @CheckForNull transient Collection<Map.Entry<K, V>> entries;
    @CheckForNull transient Map<K, Collection<V>> asMap;
    @CheckForNull transient Multiset<K> keys;

    @SuppressWarnings("unchecked")
    @Override
    Multimap<K, V> delegate() {

      extends SynchronizedObject implements Multimap<K, V> {
    @CheckForNull transient Set<K> keySet;
    @CheckForNull transient Collection<V> valuesCollection;
    @CheckForNull transient Collection<Map.Entry<K, V>> entries;
    @CheckForNull transient Map<K, Collection<V>> asMap;
    @CheckForNull transient Multiset<K> keys;

    @SuppressWarnings("unchecked")
    @Override
    Multimap<K, V> delegate() {

  static final ImmutableList<Object> EMPTY = new RegularImmutableList<>(new Object[0], 0);

  // The first `size` elements are non-null.
  @VisibleForTesting final transient @Nullable Object[] array;
  private final transient int size;

  RegularImmutableList(@Nullable Object[] array, int size) {
    this.array = array;
    this.size = size;
  }

  @Override
  public int size() {
    return size;

   *
   * <p>The pointers in [size(), entries.length) are all "null" (UNSET).
   */
  @CheckForNull private transient int[] entries;

  /**
   * The elements contained in the set, in the range of [0, size()). The elements in [size(),
   * elements.length) are all {@code null}.
   */
  @VisibleForTesting @CheckForNull transient @Nullable Object[] elements;

  /**

 */
package org.apache.maven.settings;

import java.io.Serializable;

import static java.util.Objects.requireNonNull;

public abstract class BaseObject implements Serializable, Cloneable {
    protected transient ChildrenTracking childrenTracking;

    protected Object delegate;

    public BaseObject() {}

    public BaseObject(Object delegate, BaseObject parent) {

package org.apache.maven.model;

import java.io.Serializable;

import static java.util.Objects.requireNonNull;

public abstract class BaseObject implements Serializable, Cloneable, InputLocationTracker {
    protected transient ChildrenTracking childrenTracking;

    protected Object delegate;

    public BaseObject() {}

    public BaseObject(Object delegate, BaseObject parent) {