protected void parseCommonElements(
StartElement startElement, XMLEventReader xmlEventReader, RequestAbstractType request)
throws ParsingException {
if (startElement == null) throw new IllegalArgumentException(ErrorCodes.NULL_START_ELEMENT);
String elementName = StaxParserUtil.getStartElementName(startElement);
if (JBossSAMLConstants.ISSUER.get().equals(elementName)) {
startElement = StaxParserUtil.getNextStartElement(xmlEventReader);
NameIDType issuer = new NameIDType();
issuer.setValue(StaxParserUtil.getElementText(xmlEventReader));
request.setIssuer(issuer);
} else if (JBossSAMLConstants.SIGNATURE.get().equals(elementName)) {
request.setSignature(StaxParserUtil.getDOMElement(xmlEventReader));
}
}