How to use

getParent

method

in

org.jdom2.Parent

/**
 * Determines if this element is the ancestor of another element.
 *
 * @param element <code>Element</code> to check against
 * @return <code>true</code> if this element is the ancestor of the
 *         supplied element
 */
public boolean isAncestor(final Element element) {
  Parent p = element.getParent();
  while (p instanceof Element) {
    if (p == this) {
      return true;
    }
    p = p.getParent();
  }
  return false;
}

  return ret;
p = p.getParent();

while ((current= current.getParent()) instanceof Element);

/**
 * Use xml:base attributes at feed and entry level to resolve relative links
 */
private static String resolveURI(final URL baseURI, final Parent parent, String url) {
  url = url.equals(".") || url.equals("./") ? "" : url;
  if (isRelativeURI(url) && parent != null && parent instanceof Element) {
    final Attribute baseAtt = ((Element) parent).getAttribute("base", Namespace.XML_NAMESPACE);
    String xmlBase = baseAtt == null ? "" : baseAtt.getValue();
    if (!isRelativeURI(xmlBase) && !xmlBase.endsWith("/")) {
      xmlBase = xmlBase.substring(0, xmlBase.lastIndexOf("/") + 1);
    }
    return resolveURI(baseURI, parent.getParent(), xmlBase + url);
  } else if (isRelativeURI(url) && parent == null) {
    return baseURI + url;
  } else if (baseURI != null && url.startsWith("/")) {
    String hostURI = baseURI.getProtocol() + "://" + baseURI.getHost();
    if (baseURI.getPort() != baseURI.getDefaultPort()) {
      hostURI = hostURI + ":" + baseURI.getPort();
    }
    return hostURI + url;
  }
  return url;
}

/** Use xml:base attributes at feed and entry level to resolve relative links */
private static String resolveURI(URL baseURI, Parent parent, String url) {
  url = (url.equals(".") || url.equals("./")) ? "" : url;
  if (isRelativeURI(url) && parent != null && parent instanceof Element) {
    Attribute baseAtt = ((Element)parent).getAttribute("base", Namespace.XML_NAMESPACE);
    String xmlBase = (baseAtt == null) ? "" : baseAtt.getValue();
    if (!isRelativeURI(xmlBase) && !xmlBase.endsWith("/")) {
      xmlBase = xmlBase.substring(0, xmlBase.lastIndexOf("/")+1);
    }
    return resolveURI(baseURI, parent.getParent(), xmlBase + url);
  } else if (isRelativeURI(url) && parent == null) {
    return baseURI + url;
  } else if (baseURI != null && url.startsWith("/")) {
    String hostURI = baseURI.getProtocol() + "://" + baseURI.getHost();
    if (baseURI.getPort() != baseURI.getDefaultPort()) {
      hostURI = hostURI + ":" + baseURI.getPort();
    }
    return hostURI + url;
  }
  return url;
}

/** Use xml:base attributes at feed and entry level to resolve relative links */
private static String resolveURI(URL baseURI, Parent parent, String url) {
  url = (url.equals(".") || url.equals("./")) ? "" : url;
  if (isRelativeURI(url) && parent != null && parent instanceof Element) {
    Attribute baseAtt = ((Element)parent).getAttribute("base", Namespace.XML_NAMESPACE);
    String xmlBase = (baseAtt == null) ? "" : baseAtt.getValue();
    if (!isRelativeURI(xmlBase) && !xmlBase.endsWith("/")) {
      xmlBase = xmlBase.substring(0, xmlBase.lastIndexOf("/")+1);
    }
    return resolveURI(baseURI, parent.getParent(), xmlBase + url);
  } else if (isRelativeURI(url) && parent == null) {
    return baseURI + url;
  } else if (baseURI != null && url.startsWith("/")) {
    String hostURI = baseURI.getProtocol() + "://" + baseURI.getHost();
    if (baseURI.getPort() != baseURI.getDefaultPort()) {
      hostURI = hostURI + ":" + baseURI.getPort();
    }
    return hostURI + url;
  }
  return url;
}

/**
 * Use xml:base attributes at feed and entry level to resolve relative links
 */
private static String resolveURI(final URL baseURI, final Parent parent, String url) {
  url = url.equals(".") || url.equals("./") ? "" : url;
  if (isRelativeURI(url) && parent != null && parent instanceof Element) {
    final Attribute baseAtt = ((Element) parent).getAttribute("base", Namespace.XML_NAMESPACE);
    String xmlBase = baseAtt == null ? "" : baseAtt.getValue();
    if (!isRelativeURI(xmlBase) && !xmlBase.endsWith("/")) {
      xmlBase = xmlBase.substring(0, xmlBase.lastIndexOf("/") + 1);
    }
    return resolveURI(baseURI, parent.getParent(), xmlBase + url);
  } else if (isRelativeURI(url) && parent == null) {
    return baseURI + url;
  } else if (baseURI != null && url.startsWith("/")) {
    String hostURI = baseURI.getProtocol() + "://" + baseURI.getHost();
    if (baseURI.getPort() != baseURI.getDefaultPort()) {
      hostURI = hostURI + ":" + baseURI.getPort();
    }
    return hostURI + url;
  }
  return url;
}

  } else {
    return resolveURI(baseURI, parent.getParent(), 
      stripTrailingSlash(xmlbase) + "/"+ stripStartingSlash(url));
return resolveURI(baseURI, parent.getParent(), url);

  } else {
    return resolveURI(baseURI, parent.getParent(), stripTrailingSlash(xmlbase) + "/" + stripStartingSlash(url));
return resolveURI(baseURI, parent.getParent(), url);

  } else {
    return resolveURI(baseURI, parent.getParent(), 
      stripTrailingSlash(xmlbase) + "/"+ stripStartingSlash(url));
return resolveURI(baseURI, parent.getParent(), url);

  } else {
    return resolveURI(baseURI, parent.getParent(), stripTrailingSlash(xmlbase) + "/" + stripStartingSlash(url));
return resolveURI(baseURI, parent.getParent(), url);

parentNode = parentNode.getParent();