private Node resolve(XmlUtils xml, String xpath) throws Exception {
Node parent = xml.getSingleNode(xpath);
if (parent == null) {
log.trace("Failed to resolve " + xpath + ", creating node");
try {
// This can be quite an obscure stack trace.
parent = xml.createNode(xpath);
} catch (Exception e) {
throw new Exception("Failed to create node [" + xpath + "]", e);
}
}
return parent;
}
@Override
public Document merge(Document original, Document newDoc) throws Exception {
if (getXpathToParentNode() == null) {
throw new Exception("No parent node configured");
}
Document resultDoc = original;
XmlUtils xml = create(resultDoc);
Node parent = resolve(xml, getXpathToParentNode());
if (parent.getOwnerDocument() == null) {
throw new Exception("Invalid xpath-to-parent-node [" + getXpathToParentNode() + "]");
}
xml.appendNode(newDoc.getDocumentElement(), parent);
return resultDoc;
}