/**
* Parses a User extension sub-packet and creates a {@link UserPacketExtension} instance. At the
* beginning of the method call, the xml parser will be positioned on the opening element of the
* packet extension. As required by the smack API, at the end of the method call, the parser will
* be positioned on the closing element of the packet extension.
*
* @param parser an XML parser positioned at the opening <tt>User</tt> element.
* @return a new {@link UserPacketExtension} instance.
* @throws java.lang.Exception if an error occurs parsing the XML.
*/
public UserPacketExtension parseExtension(XmlPullParser parser) throws Exception {
boolean done = false;
int eventType;
String elementName = null;
String entity = parser.getAttributeValue("", UserPacketExtension.ENTITY_ATTR_NAME);
StateType state = StateType.full;
String stateStr = parser.getAttributeValue("", UserPacketExtension.STATE_ATTR_NAME);
if (stateStr != null) {
state = StateType.parseString(stateStr);
}
if (entity == null) {
throw new Exception("Coin user element must contain entity attribute");
}
UserPacketExtension ext = new UserPacketExtension(entity);
ext.setAttribute(UserPacketExtension.STATE_ATTR_NAME, state);
while (!done) {
eventType = parser.next();
elementName = parser.getName();
if (eventType == XmlPullParser.START_TAG) {
if (elementName.equals(UserPacketExtension.ELEMENT_DISPLAY_TEXT)) {
ext.setDisplayText(CoinIQProvider.parseText(parser));
} else if (elementName.equals(EndpointPacketExtension.ELEMENT_NAME)) {
PacketExtensionProvider provider = new EndpointProvider();
PacketExtension childExtension = provider.parseExtension(parser);
ext.addChildExtension(childExtension);
}
} else if (eventType == XmlPullParser.END_TAG) {
if (parser.getName().equals(UserPacketExtension.ELEMENT_NAME)) {
done = true;
}
}
}
return ext;
}