*/
    public static void appendNode(final Node node, final StringBuilder buf) {
        assertArgumentNotNull("node", node);
        assertArgumentNotNull("buf", buf);

        switch (node.getNodeType()) {
        case Node.ELEMENT_NODE:
            appendElement((Element) node, buf);
            break;
        case Node.TEXT_NODE:
            appendText((Text) node, buf);
            break;

            for (int i = 0; i < nodeList.getLength(); i++) {
                final Node childNode = nodeList.item(i);
                parseTextContent(childNode, buf);
            }
        } else if (node.getNodeType() == Node.TEXT_NODE) {
            final String value = node.getTextContent();
            if (value != null) {
                final String content = value.trim();
                if (content.length() > 0) {

            return null;
        }

        @Override
        public void setNodeValue(String nodeValue) {
            this.nodeValue = nodeValue;
        }

        @Override
        public short getNodeType() {
            return 0;
        }
    }

    private static class MockNamedNodeMap implements NamedNodeMap {
        private final Map<String, Node> items = new HashMap<>();