return delegate;
    }

    @Override
    public Condition newCondition() {
      return new WeakSafeCondition(delegate.newCondition(), strongReference);
    }
  }

  /** Condition object that ensures a strong reference is retained to a specified object. */
  private static final class WeakSafeCondition extends ForwardingCondition {
    private final Condition delegate;

    @SuppressWarnings("unused")