public List<String> getBasicBuildingBlocksCertChain(String tokenId) { List<String> certIds = new LinkedList<String>(); XmlBasicBuildingBlocks bbb = getBasicBuildingBlockById(tokenId); if (bbb != null) { List<XmlChainItem> chainItems = bbb.getCertificateChain().getChainItem(); if (Utils.isCollectionNotEmpty(chainItems)) { for (XmlChainItem chainItem : chainItems) { certIds.add(chainItem.getId()); } } } return certIds; }