XmlSource.java 文件源码

private void setUpXMLParser(ReadableByteChannel channel, byte[] lookAhead) throws IOException {
  try {
    // We use Woodstox because the StAX implementation provided by OpenJDK reports
    // character locations incorrectly. Note that Woodstox still currently reports *byte*
    // locations incorrectly when parsing documents that contain multi-byte characters.
    XMLInputFactory2 xmlInputFactory = (XMLInputFactory2) XMLInputFactory.newInstance();
    this.parser = xmlInputFactory.createXMLStreamReader(
        new SequenceInputStream(
            new ByteArrayInputStream(lookAhead), Channels.newInputStream(channel)),
        getCurrentSource().configuration.getCharset());

    // Current offset should be the offset before reading the record element.
    while (true) {
      int event = parser.next();
      if (event == XMLStreamConstants.START_ELEMENT) {
        String localName = parser.getLocalName();
        if (localName.equals(getCurrentSource().configuration.getRecordElement())) {
          break;
        }
      }
    }
  } catch (FactoryConfigurationError | XMLStreamException e) {
    throw new IOException(e);
  }
}