How to parse XML to Stanza or XmlFragment in vysper enviroment - apache-vysper

Question

To make a nice and readable test case i'd like to parse some hand written XML (copy-paste from xmpp.org), transform it to Stanza or XMLElement and proceed with actual tests. So i'd like to avoid stanza builders at all.
Is such thing possible with Non-blocking XML parser?

Answer 1

In order to obtain XMLElement solution is to use DefaultNonBlockingXMLReader and assign a stanza listener.
The trick is to start "stream", so XML of stanza to test should be wrapped to something like ".....
The code:
private Stanza fetchStanza(String xml) throws SAXException {
try {
NonBlockingXMLReader reader = new DefaultNonBlockingXMLReader();
reader.setContentHandler(new XMPPContentHandler(new XMLElementBuilderFactory()));
XMPPContentHandler contentHandler = (XMPPContentHandler) reader.getContentHandler();
final ArrayList<Stanza> container = new ArrayList(); // just some container to hold stanza.
contentHandler.setListener(new XMPPContentHandler.StanzaListener() {
public void stanza(XMLElement element) {
Stanza stanza = StanzaBuilder.createClone(element, true, Collections.EMPTY_LIST).build();
if (!container.isEmpty()) {
container.clear(); // we need only last element, so clear the container
}
container.add(stanza);
}
});
IoBuffer in = IoBuffer.wrap(("<stream>" + xml + "</stream>").getBytes()); // the trick it to wrap xml to stream
reader.parse(in, CharsetUtil.UTF8_DECODER);
Stanza stanza = container.iterator().next();
return stanza;
} catch (IOException ex) {
throw new RuntimeException(ex);
}
}