/**
* Removes empty #text nodes from a document. From James Murty on this StackOverflow post:
* http://stackoverflow.com/questions/978810/how-to-strip-whitespace-only-text-nodes-from-a-dom-before-serialization
*
* @param doc The document to remove empty text nodes from.
*/
private static void removeEmptyTextNodes(Document doc) {
try {
XPathFactory xpathFactory = XPathFactory.newInstance();
// XPath to find empty text nodes.
XPathExpression xpathExp =
xpathFactory.newXPath().compile("//text()[normalize-space(.) = '']");
NodeList emptyTextNodes = (NodeList) xpathExp.evaluate(doc, XPathConstants.NODESET);
// Remove each empty text node from document.
for (int i = 0; i < emptyTextNodes.getLength(); i++) {
Node emptyTextNode = emptyTextNodes.item(i);
emptyTextNode.getParentNode().removeChild(emptyTextNode);
}
} catch (Exception ex) {
ex.printStackTrace();
}
}
private NodeList findNodes(Document doc, Node operation) {
List<Node> xpaths = getChildNodes(operation, "xpath");
if (xpaths.isEmpty()) {
return null;
}
String xpathExpression = xpaths.get(0).getTextContent();
if (xpathExpression == null) {
return null;
}
XPathFactory xPathfactory = XPathFactory.newInstance();
XPath xpath = xPathfactory.newXPath();
NodeList nl = null;
try {
XPathExpression expr = xpath.compile(xpathExpression);
nl = (NodeList) expr.evaluate(doc, XPathConstants.NODESET);
} catch (XPathExpressionException ex) {
Utils.onError(new Error.WrongXpathExpression(xpathExpression));
}
return nl;
}