utils/src/main/java/jetbrains/exodus/core/dataStructures/decorators/HashSetDecorator.java [36:119]:
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
        this();
        addAll(c);
    }

    @Override
    public int size() {
        return decorated.size();
    }

    @Override
    public boolean isEmpty() {
        return decorated == Collections.emptySet() || decorated.isEmpty();
    }

    @Override
    public boolean contains(Object o) {
        return decorated.contains(o);
    }

    @Override
    public @NotNull Iterator<E> iterator() {
        return decorated.iterator();
    }

    @Override
    public Object @NotNull [] toArray() {
        return decorated.toArray();
    }

    @Override
    public <T> T @NotNull [] toArray(T @NotNull [] a) {
        return decorated.toArray(a);
    }

    @Override
    public boolean add(E e) {
        checkDecorated();
        return decorated.add(e);
    }

    @Override
    public boolean remove(Object o) {
        if (decorated == Collections.emptySet()) return false;
        final boolean result = decorated.remove(o);
        if (result && decorated.isEmpty()) {
            clear();
        }
        return result;
    }

    @Override
    public boolean containsAll(@NotNull Collection<?> c) {
        return decorated.containsAll(c);
    }

    @Override
    public boolean addAll(@NotNull Collection<? extends E> c) {
        checkDecorated();
        return decorated.addAll(c);
    }

    @Override
    public boolean retainAll(@NotNull Collection<?> c) {
        checkDecorated();
        return decorated.retainAll(c);
    }

    @Override
    public boolean removeAll(@NotNull Collection<?> c) {
        if (decorated == Collections.emptySet()) return false;
        final boolean result = decorated.removeAll(c);
        if (result && decorated.isEmpty()) {
            clear();
        }
        return result;
    }

    @Override
    public void clear() {
        decorated = Collections.emptySet();
    }

    private void checkDecorated() {
        if (decorated == Collections.emptySet()) {
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -



utils/src/main/java/jetbrains/exodus/core/dataStructures/decorators/LinkedHashSetDecorator.java [35:118]:
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -
        this();
        addAll(c);
    }

    @Override
    public int size() {
        return decorated.size();
    }

    @Override
    public boolean isEmpty() {
        return decorated == Collections.emptySet() || decorated.isEmpty();
    }

    @Override
    public boolean contains(Object o) {
        return decorated.contains(o);
    }

    @Override
    public @NotNull Iterator<E> iterator() {
        return decorated.iterator();
    }

    @Override
    public Object @NotNull [] toArray() {
        return decorated.toArray();
    }

    @Override
    public <T> T @NotNull [] toArray(T @NotNull [] a) {
        return decorated.toArray(a);
    }

    @Override
    public boolean add(E e) {
        checkDecorated();
        return decorated.add(e);
    }

    @Override
    public boolean remove(Object o) {
        if (decorated == Collections.emptySet()) return false;
        final boolean result = decorated.remove(o);
        if (result && decorated.isEmpty()) {
            clear();
        }
        return result;
    }

    @Override
    public boolean containsAll(@NotNull Collection<?> c) {
        return decorated.containsAll(c);
    }

    @Override
    public boolean addAll(@NotNull Collection<? extends E> c) {
        checkDecorated();
        return decorated.addAll(c);
    }

    @Override
    public boolean retainAll(@NotNull Collection<?> c) {
        checkDecorated();
        return decorated.retainAll(c);
    }

    @Override
    public boolean removeAll(@NotNull Collection<?> c) {
        if (decorated == Collections.emptySet()) return false;
        final boolean result = decorated.removeAll(c);
        if (result && decorated.isEmpty()) {
            clear();
        }
        return result;
    }

    @Override
    public void clear() {
        decorated = Collections.emptySet();
    }

    private void checkDecorated() {
        if (decorated == Collections.emptySet()) {
- - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - - -