* www.google.com} is {@code google.com}.
   *
   * @throws IllegalStateException if the domain has no parent, as determined by {@link #hasParent}
   */
  public InternetDomainName parent() {
    checkState(hasParent(), "Domain '%s' has no parent", name);
    return ancestor(1);
  }

  /**
   * Returns the ancestor of the current domain at the given number of levels "higher" (rightward)

     */
    public MavenProject getParent() {
        return parent;
    }

    public void setParent(MavenProject parent) {
        this.parent = parent;
    }

    public boolean hasParent() {
        return getParent() != null;
    }

    public File getFile() {
        return file;
    }

    public void setFile(File file) {
        this.file = file;