Java Utililty Methods XML Node Previous

Node previous = node.getPreviousSibling();
while (!(previous instanceof Element) && previous != null) {
    previous = previous.getPreviousSibling();
if (previous instanceof Text) {
    return null;
return previous;
...

Node node = currentNode.getParentNode();
while ((node != null) && (!node.getNodeName().equals(tagName))) {
    node = node.getParentNode();
return node;

node = node.getPreviousSibling();
while (node != null && node.getNodeType() != nodeType) {
    node = node.getPreviousSibling();
return node;

node = node.getPreviousSibling();
while (node != null && node.getNodeType() != nodeType) {
    node = node.getPreviousSibling();
return node;

node = node.getPreviousSibling();
while (node != null && node.getNodeType() != nodeType) {
    node = node.getPreviousSibling();
return node;