/** * This method returns a Set of trust anchor VAT numbers * * @return a Set of VAT numbers */ public Set<String> getTrustAnchorVATNumbers() { Set<String> result = new HashSet<String>(); XmlChainItem cert = getTrustAnchorCertificate(); if (cert != null) { List<XmlTrustAnchor> trustAnchors = cert.getTrustAnchors(); for (XmlTrustAnchor xmlTrustAnchor : trustAnchors) { result.add(xmlTrustAnchor.getTrustServiceProviderRegistrationId()); } } return result; }