return Objects.hash(duration, unit);
    }

    @Override
    public boolean equals(@Nullable Object o) {
      if (o instanceof DurationSpec) {
        DurationSpec that = (DurationSpec) o;
        return unit.toNanos(duration) == that.unit.toNanos(that.duration);
      }
      return false;
    }

    @Override
    public String toString() {
      return MoreObjects.toStringHelper(this)

                    e);

            return null;
        }

        return artifactFactory.createExtensionArtifact(groupId, artifactId, versionRange);
    }

    public Artifact createParentArtifact(String groupId, String artifactId, String version) {
        return artifactFactory.createParentArtifact(groupId, artifactId, version);
    }

    @Override

     *
     * @return the buffer
     */
    public DfsReferralResponseBuffer getDfsResponse() {
        return this.dfsResponse;
    }

    @Override
    public boolean isForceUnicode() {
        return true;
    }

    @Override
    protected int writeSetupWireFormat(final byte[] dst, final int dstIndex) {
        return 0;
    }

    @Override

    }

    @Override
    public byte getFileInformationLevel() {
        return FILE_STANDARD_INFO;
    }

    @Override
    public int getAttributes() {
        return 0;
    }

    @Override
    public long getCreateTime() {
        return 0L;
    }

    @Override
    public long getLastWriteTime() {
        return 0L;
    }

    @Override
    public long getLastAccessTime() {

     *
     * @return whether the response is received
     */
    boolean isReceived();

    /**
     * Set received status
     */
    void received();

    /**
     * Unset received status
     */
    void clearReceived();

    /**
     * Gets the number of credits granted by the server.
     *
     * @return number of credits granted by the server
     */

        this.sessionId = sessionId;
    }

    /**
     * Gets the signature or authentication tag for the encrypted message
     *
     * @return the signature/authentication tag
     */
    public byte[] getSignature() {
        return this.signature;
    }

    /**
     * Sets the signature or authentication tag for the encrypted message
     *
     * @param signature

     * helper for equals
     */
    private static boolean objectsEqual(Object o1, Object o2) {
        if (o1 == null && o2 == null) {
            return true;
        }
        if (o1 == null || o2 == null) {
            return false; // as they are not both null
        }
        return o1.equals(o2);
    }

    // ----------------------------------------------------------------------------
    /**

      if (c.isEmpty()) {
        return defaultValue;
      } else if (iterable instanceof List) {
        return getLastInNonemptyList((List<? extends T>) iterable);
      } else if (iterable instanceof SortedSet) {
        return ((SortedSet<? extends T>) iterable).last();
      }
    }

    return Iterators.getLast(iterable.iterator(), defaultValue);
  }

        if (StringUtil.isBlank(st)) {
            return "groovy";
        }
        return st;
    }

    public boolean isLoggingEnabled() {
        return Constants.T.equals(getJobLogging());
    }

    public boolean isCrawlerJob() {
        return Constants.T.equals(getCrawler());
    }

    public boolean isEnabled() {
        return Constants.T.equals(getAvailable());
    }

  }

  @Override
  public int size() {
    return 1;
  }

  @Override
  public boolean contains(@Nullable Object target) {
    return element.equals(target);
  }

  @Override
  public UnmodifiableIterator<E> iterator() {
    return singletonIterator(element);
  }

  @Override
  public ImmutableList<E> asList() {
    return ImmutableList.of(element);
  }

  @Override