if (localDelegate != null) {
        return "delegate=[" + localDelegate + "]";
      }
      return null;
    }

    @Override
    protected void afterDone() {
      delegate = null;
    }
  }

  /**
   * Creates a new {@code ListenableFuture} whose value is a list containing the values of all its

      if (localDelegate != null) {
        return "delegate=[" + localDelegate + "]";
      }
      return null;
    }

    @Override
    protected void afterDone() {
      delegate = null;
    }
  }

  /**
   * Creates a new {@code ListenableFuture} whose value is a list containing the values of all its