Comparator<? super K> comparator = delegate.comparator();
    if (comparator != null) {
      return comparator;
    }
    return NATURAL_ORDER;
  }

  @Override
  public boolean containsKey(Object key) {
    try {
      return delegate.containsKey(checkValid(key));
    } catch (NullPointerException | ClassCastException e) {
      return false;
    }
  }

  @Override
  public boolean containsValue(Object value) {

	if err != nil {
		return
	}
	err = en.WriteInt(z.ScanMode)
	if err != nil {
		err = msgp.WrapError(err, "ScanMode")
		return
	}
	// write "c"
	err = en.Append(0xa1, 0x63)
	if err != nil {
		return
	}
	if z.Cache == nil {
		err = en.WriteNil()
		if err != nil {
			return
		}
	} else {
		err = z.Cache.EncodeMsg(en)
		if err != nil {
			err = msgp.WrapError(err, "Cache")
			return
		}
	}

		return
	}
	err = en.WriteTime(z.Queued)
	if err != nil {
		err = msgp.WrapError(err, "Queued")
		return
	}
	// write "BitrotScan"
	err = en.Append(0xaa, 0x42, 0x69, 0x74, 0x72, 0x6f, 0x74, 0x53, 0x63, 0x61, 0x6e)
	if err != nil {
		return
	}
	err = en.WriteBool(z.BitrotScan)
	if err != nil {
		err = msgp.WrapError(err, "BitrotScan")
		return
	}
	return
}

    return delegate.descendingIterator();
  }

  @Override
  public NavigableSet<E> descendingSet() {
    return new SafeTreeSet<>(delegate.descendingSet());
  }

  @Override
  public E first() {
    return delegate.first();
  }

  @Override
  public @Nullable E floor(E e) {
    return delegate.floor(checkValid(e));
  }

  @Override
  public SortedSet<E> headSet(E toElement) {

    public Collection<V> values() {
        return parent.values();
    }

    @Override
    public Set<Entry<K, V>> entrySet() {
        // return original keys
        return parent.entrySet();
    }

    @Override
    public boolean equals(final Object o) {
        return parent.equals(o);
    }

    @Override
    public int hashCode() {
        return parent.hashCode();
    }

     * @return the current builder
     */
    @Nonnull
    default MessageBuilder a(Object value) {
        return append(String.valueOf(value));
    }

    /**
     * Append newline to the message buffer.
     *
     * @return the current builder
     */
    @Nonnull
    default MessageBuilder newline() {
        return append(System.lineSeparator());
    }

    /**

    public NavigableSet<E> elementSet() {
      return new StandardElementSet();
    }

    @Override
    public Entry<E> firstEntry() {
      return standardFirstEntry();
    }

    @Override
    public Entry<E> lastEntry() {
      return standardLastEntry();
    }

    @Override
    public Entry<E> pollFirstEntry() {
      return standardPollFirstEntry();
    }

    @Override

    if (object == null) {
      return false;
    }
    try {
      @SuppressWarnings("unchecked") // The worst case is usually CCE, which we catch.
      C c = (C) object;
      return range.contains(c);
    } catch (ClassCastException e) {
      return false;
    }
  }

  @Override
  public boolean containsAll(Collection<?> targets) {
    return Collections2.containsAllImpl(this, targets);
  }

func (n NSQArgs) Validate() error {
	if !n.Enable {
		return nil
	}

	if n.NSQDAddress.IsEmpty() {
		return errors.New("empty nsqdAddress")
	}

	if n.Topic == "" {
		return errors.New("empty topic")
	}
	if n.QueueDir != "" {
		if !filepath.IsAbs(n.QueueDir) {
			return errors.New("queueDir path should be absolute")
		}
	}

	return nil
}

// NSQTarget - NSQ target.
type NSQTarget struct {

        return token;
    }

    /**
     * Returns the segmentation.
     *
     * @return The segmentation.
     */
    public String getSegmentation() {
        return segmentation;
    }

    /**
     * Returns the reading.
     *
     * @return The reading.
     */
    public String getReading() {
        return reading;
    }

    /**