VespaRecordWriter.java 文件源码

private String findDocIdFromXml(String xml) {
    try {
        XMLEventReader eventReader = XMLInputFactory.newInstance().createXMLEventReader(new StringReader(xml));
        while (eventReader.hasNext()) {
            XMLEvent event = eventReader.nextEvent();
            if (event.getEventType() == XMLEvent.START_ELEMENT) {
                StartElement element = event.asStartElement();
                String elementName = element.getName().getLocalPart();
                if (VespaDocumentOperation.Operation.valid(elementName)) {
                    return element.getAttributeByName(QName.valueOf("documentid")).getValue();
                }
            }
        }
    } catch (XMLStreamException | FactoryConfigurationError e) {
        // as json dude does
        return null;
    }
    return null;
}