public Serializable getKey() 
{
        return "1";
}

Generate the unique key. This key must be unique inside the space of this component.

 public SourceValidity getValidity() 
{
//      Whilst the cache does not store gathered links, this component must be non-cacheable
//      return NOPValidity.SHARED_INSTANCE;
        return null;
}

Generate the validity object.

 public  void setup(SourceResolver resolver,
    Map objectModel,
    String src,
    Parameters par) throws IOException, SAXException, ProcessingException 
{
            this.links = (List)objectModel.get(Constants.LINK_COLLECTION_OBJECT);
}

Set the SourceResolver, objectModel Map, the source and sitemap Parameters used to process the request.

 public  void simpleLink(String href,
    String role,
    String arcrole,
    String title,
    String show,
    String actuate,
    String uri,
    String name,
    String raw,
    Attributes attr) throws SAXException 
{
            if (!this.links.contains(href)){
                this.addLink(href);
            }
            super.simpleLink(href, role, arcrole, title, show, actuate, uri, name, raw, attr);
}

 public  void startLocator(String href,
    String role,
    String title,
    String label,
    String uri,
    String name,
    String raw,
    Attributes attr) throws SAXException 
{
            if (!this.links.contains(href)){
                this.addLink(href);
            }
            super.startLocator(href, role, title, label, uri, name, raw, attr);
}