@Override
  public boolean containsKey(@Nullable Object key) {
    Map<K, V> delegate = delegateOrNull();
    return (delegate != null) ? delegate.containsKey(key) : indexOf(key) != -1;
  }

  @Override
  public @Nullable V get(@Nullable Object key) {
    Map<K, V> delegate = delegateOrNull();
    if (delegate != null) {
      return delegate.get(key);
    }
    int index = indexOf(key);
    if (index == -1) {

		if errors.Is(err, kes.ErrNotAllowed) {
			return ErrPermission
		}
		return errKeyCreationFailed(err)
	}
	return nil
}

// DeleteKey deletes a key at the KMS with the given key ID.
// Please note that is a dangerous operation.
// Once a key has been deleted all data that has been encrypted with it cannot be decrypted
// anymore, and therefore, is lost.

      implements Serializable {
    final Multiset<? extends E> delegate;

    UnmodifiableMultiset(Multiset<? extends E> delegate) {
      this.delegate = delegate;
    }

    @SuppressWarnings("unchecked")
    @Override
    protected Multiset<E> delegate() {
      // This is safe because all non-covariant methods are overridden
      return (Multiset<E>) delegate;
    }

      implements Serializable {
    final Multiset<? extends E> delegate;

    UnmodifiableMultiset(Multiset<? extends E> delegate) {
      this.delegate = delegate;
    }

    @SuppressWarnings("unchecked")
    @Override
    protected Multiset<E> delegate() {
      // This is safe because all non-covariant methods are overridden
      return (Multiset<E>) delegate;
    }

					if len(l.lockMap) != locks {
						t.Fatalf("objects deleted, want %d != got %d", locks, len(l.lockMap))
					}
					if len(l.lockUID) != locks*readers {
						t.Fatalf("objects deleted, want %d != got %d", locks*readers, len(l.lockUID))
					}

					// Expire 50%
					expired := time.Now().Add(-time.Hour * 2)

      result[0] = elemCount;
      if (expectedCount == elemCount) {
        if (newCount == 0) {
          return deleteMe();
        }
        this.totalCount += newCount - elemCount;
        this.elemCount = newCount;
      }
      return this;
    }

    private @Nullable AvlNode<E> deleteMe() {
      int oldElemCount = this.elemCount;
      this.elemCount = 0;
      successor(pred(), succ());

    this(new TreeMap<K, V>(map));
  }

  private SafeTreeMap(NavigableMap<K, V> delegate) {
    this.delegate = delegate;
    if (delegate == null) {
      throw new NullPointerException();
    }
    for (K k : keySet()) {
      checkValid(k);
    }
  }

  @Override
  public @Nullable Entry<K, V> ceilingEntry(K key) {
    return delegate.ceilingEntry(checkValid(key));
  }

  @Override

    private final RepositoryListener delegate;

    EventSpyRepositoryListener(EventSpyDispatcher dispatcher, RepositoryListener delegate) {
        this.dispatcher = dispatcher;
        this.delegate = delegate;
    }

    @Override
    public void artifactDeployed(RepositoryEvent event) {
        dispatcher.onEvent(event);
        delegate.artifactDeployed(event);
    }

    @Override

    this(new TreeMap<K, V>(map));
  }

  private SafeTreeMap(NavigableMap<K, V> delegate) {
    this.delegate = delegate;
    if (delegate == null) {
      throw new NullPointerException();
    }
    for (K k : keySet()) {
      checkValid(k);
    }
  }

  @Override
  public @Nullable Entry<K, V> ceilingEntry(K key) {
    return delegate.ceilingEntry(checkValid(key));
  }

  @Override

    return delegate().edges();
  }

  @Override
  public boolean isDirected() {
    return delegate().isDirected();
  }

  @Override
  public boolean allowsParallelEdges() {
    return delegate().allowsParallelEdges();
  }

  @Override
  public boolean allowsSelfLoops() {
    return delegate().allowsSelfLoops();
  }

  @Override
  public ElementOrder<N> nodeOrder() {
    return delegate().nodeOrder();