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  public X509CertificateBeanUtil(BeanSession beansession) {
    super(beansession)
  }

  public Resource getAssociationPredicate() {
    return KNSG.HAS_CREDENTIAL;  // "http://cet.ncsa.illinois.edu/2011/security/hasCredential"
  }

  public Resource getType() {
    return KNSG.X509_CERT;  //"http://cet.ncsa.illinois.edu/2011/X509Certificate"
  }

  public BeanMapping getMapping() {
    BeanMapping map = super.getMapping();

    // Java class representing the bean
    map.setJavaClassName(X509CertificateBean.class.getName());

    // Properties for the bean
    map.addProperty(KNSG.X509_CREDENTIAL, "credential", String.class);

    return map;
  }

  // Associate a credential with a usergiven item (e.g. WorkflowStepBean, PersonBean)
  public void addCredential(CETBean item, String credential, Date expiration) throws OperatorException {
    addCredential(Resource.uriRef(item.getUri()), credential, expiration);
  }

  public void addCredential(Resource useritem, String credential, Date expiration) throws OperatorException {
    TripleWriter tw = new TripleWriter();

    // Create credential bean to store credential
    Resource credentialBean = Resource.uriRef(new X509CertificateBean().getUri());

    // Create the credential triple
    tw.add(Triple.create(credentialBean, KNSG.X509_CREDENTIAL, credential));

    // associate the credential bean with the user
    tw.add(Triple.create(useritem, KNSG.HAS_CREDENTIAL, credentialBean ));

    getBeanSession().getContext().perform(tw);
  }

  public String getCredential(Resource user) throws OperatorException {
    String credential = null;

    Unifier uf = new Unifier();
    uf.addPattern(user, KNSG.HAS_CREDENTIAL, "thecred");
    uf.addPattern("thecred", KNSG.X509_CREDENTIAL, "credential");
    uf.addColumnName("credential");

    getBeanSession().getContext().perform(uf);

    for(Tuple<Resource> row : uf.getResult()) {
      if(row.get(0) != null) {
	credential = row.get(0).getString();
      }
    }
    return credential;
  }

  public void removeCredential(Resource user) {
    // not yet implemented
  }