XmlDataSetProducer.java 文件源码

/**
 * @param inputStream The inputstream to read from
 * @return A new pull parser
 */
private static XMLStreamReader openPullParser(InputStream inputStream) {
  try {
    BufferedReader bufferedReader = new BufferedReader(new InputStreamReader(inputStream, Charsets.UTF_8));
    Reader reader;
    int version = Version2to4TransformingReader.readVersion(bufferedReader);

    if (version == 2 || version == 3) {
      reader = new Version2to4TransformingReader(bufferedReader, version);
    } else {
      reader = bufferedReader;
    }

    if (version > 4) {
      throw new IllegalStateException("Unknown XML dataset format: "+version +"  This dataset has been produced by a later version of Morf");
    }
    return XMLInputFactory.newFactory().createXMLStreamReader(reader);
  } catch (XMLStreamException|FactoryConfigurationError e) {
    throw new RuntimeException(e);
  }
}