Use DOM to traverse a XML tree - Java code

private void traverse(Node node, int height) {
    switch (node.getNodeType()) {
    case Node.DOCUMENT_NODE:
      ...
      break;
    case Node.ELEMENT_NODE:
      ...
      break;
    case Node.TEXT_NODE:
      ...
      break;
    case Node.CDATA_SECTION_NODE:
      ...
      break;
    case Node.COMMENT_NODE:
      ...
      break;
    case Node.PROCESSING_INSTRUCTION_NODE:
      ...
      break;
    }
    NodeList nodeList = node.getChildNodes();
    Node child = node.getFirstChild();
    while (child != null) {
      traverse(child, height);
      child = child.getNextSibling();
    }
  }