DOMParserUtil { public static List<Node> getNestedChildrenNodesList(Document document, String grandParentNodeName, String parentNodeName, String childNodeName) { return asStream(document.getElementsByTagName(childNodeName)) .filter(childNode -> { Node parentNode = childNode.getParentNode(); Node grandParentNode = parentNode.getParentNode(); return Objects.equals(parentNodeName, parentNode.getNodeName()) && Objects.equals(grandParentNodeName, grandParentNode.getNodeName()); }).collect(Collectors.toList()); } private  DOMParserUtil(); static String cleanupNodes(String fullXml, String containerNodeName, String nodeToRemoveName); static void cleanupNodes(Document document, String containerNodeName, String nodeToRemoveName); static void replaceNodeText(Document document, String containerNodeName, String nodeName, String toReplace, String replacement); static String replaceNodeName(Document document, String containerNodeName, String childNodeNameToReplace, String childNodeNameReplacement); static String getAttributeValue(Node containerNode, String attributeName); static Map<Node, String> getAttributeValues(Document document, String containerNodeName, String attributeName); static Map<Node, String> getAttributeValues(Document document, String attributeName); static void setAttributeValue(Document document, String containerNodeName, String attributeName, String attributeValue); static Map<Node, Node> createNodes(Document document, String containerNodeName, String childNodeName, String nodeContent); static Map<Node, Node> createNestedNodes(Document document, String mainContainerNodeName, String containerNodeName, String childNodeName, String nodeContent); static Node createNodeAtPosition(Node containerNode, String nodeToCreateName, String nodeContent, Integer position); static Map<Node, List<Node>> getChildrenNodesMap(String fullXml, String containerNodeName, String childNodeName); static Map<Node, List<Node>> getChildrenNodesMap(Document document, String containerNodeName, String childNodeName); static Map<Node, List<Node>> getChildrenNodesMap(Node node, String containerNodeName, String childNodeName); static List<Node> getChildrenNodesList(Node node, String childNodeName); static Map<Node, List<Node>> getNestedChildrenNodesMap(Document document, String mainContainerNodeName, String containerNodeName, String childNodeName); static List<Node> getNestedChildrenNodesList(Document document, String grandParentNodeName, String parentNodeName, String childNodeName); static List<Node> getNestedChildrenNodesList(Node node, String containerName, String childNodeName); static Document getDocument(String xml); static String getString(Document toRead);  }
@Test public void getNestedChildrenNodesList() throws Exception { Document document = DOMParserUtil.getDocument(XML); List<Node> retrieved = DOMParserUtil.getNestedChildrenNodesList(document, MAIN_NODE, CHILD_NODE, TEST_NODE); assertNotNull(retrieved); assertEquals(2, retrieved.size()); retrieved.forEach(testNode -> assertEquals(TEST_NODE, testNode.getNodeName())); retrieved = DOMParserUtil.getNestedChildrenNodesList(document, CHILD_NODE, NESTING_NODE, NESTED_NODE); assertNotNull(retrieved); assertEquals(2, retrieved.size()); retrieved.forEach(nestedNode -> assertEquals(NESTED_NODE, nestedNode.getNodeName())); }