content: package allen.town.podcast.parser.feed.util;
  
  import android.util.Log;
  
  import allen.town.podcast.parser.feed.UnsupportedFeedtypeException;
  import org.apache.commons.io.input.XmlStreamReader;
  import org.jsoup.Jsoup;
  import org.xmlpull.v1.XmlPullParser;
  import org.xmlpull.v1.XmlPullParserException;
  import org.xmlpull.v1.XmlPullParserFactory;
  
  import java.io.File;
  import java.io.FileNotFoundException;
  import java.io.IOException;
  import java.io.Reader;
  
  import allen.town.podcast.model.feed.Feed;
  
  /** Gets the type of a specific feed by reading the root element. */
  public class TypeGetter {
      private static final String TAG = "TypeGetter";
  
      public enum Type {
          RSS20, RSS091, ATOM, INVALID
      }
  
      private static final String ATOM_ROOT = "feed";
      private static final String RSS_ROOT = "rss";
  
      public Type getType(Feed feed) throws UnsupportedFeedtypeException {
          XmlPullParserFactory factory;
          if (feed.getFile_url() != null) {
              Reader reader = null;
              try {
                  factory = XmlPullParserFactory.newInstance();
                  factory.setNamespaceAware(true);
                  XmlPullParser xpp = factory.newPullParser();
                  reader = createReader(feed);
                  xpp.setInput(reader);
                  int eventType = xpp.getEventType();
  
                  while (eventType != XmlPullParser.END_DOCUMENT) {
                      if (eventType == XmlPullParser.START_TAG) {
                          String tag = xpp.getName();
                          switch (tag) {
                              case ATOM_ROOT:
                                  feed.setType(Feed.TYPE_ATOM1);
                                  Log.d(TAG, "Recognized type Atom");
  
                                  String strLang = xpp.getAttributeValue("http://www.w3.org/XML/1998/namespace", "lang");
                                  if (strLang != null) {
                                      feed.setLanguage(strLang);
                                  }
  
                                  return Type.ATOM;
                              case RSS_ROOT:
                                  String strVersion = xpp.getAttributeValue(null, "version");
                                  if (strVersion == null) {
                                      feed.setType(Feed.TYPE_RSS2);
                                      Log.d(TAG, "Assuming type RSS 2.0");
                                      return Type.RSS20;
                                  } else if (strVersion.equals("2.0")) {
                                      feed.setType(Feed.TYPE_RSS2);
                                      Log.d(TAG, "Recognized type RSS 2.0");
                                      return Type.RSS20;
                                  } else if (strVersion.equals("0.91") || strVersion.equals("0.92")) {
                                      Log.d(TAG, "Recognized type RSS 0.91/0.92");
                                      return Type.RSS091;
                                  }
                                  throw new UnsupportedFeedtypeException("Unsupported rss version");
                              default:
                                  Log.d(TAG, "Type is invalid");
                                  throw new UnsupportedFeedtypeException(Type.INVALID, tag);
                          }
                      } else {
                          try {
                              eventType = xpp.next();
                          } catch (RuntimeException e) {
                              // Apparently this happens on some devices...
                              throw new UnsupportedFeedtypeException("Unable to get type");
                          }
                      }
                  }
              } catch (XmlPullParserException e) {
                  e.printStackTrace();
                  // XML document might actually be a HTML document -> try to parse as HTML
                  String rootElement = null;
                  try {
                      Jsoup.parse(new File(feed.getFile_url()));
                      rootElement = "html";
                  } catch (IOException e1) {
                      e1.printStackTrace();
                  }
                  throw new UnsupportedFeedtypeException(Type.INVALID, rootElement);
  
              } catch (IOException e) {
                  e.printStackTrace();
              } finally {
                  if (reader != null) {
                      try {
                          reader.close();
                      } catch (IOException e) {
                          e.printStackTrace();
                      }
                  }
              }
          }
          Log.d(TAG, "Type is invalid");
          throw new UnsupportedFeedtypeException(Type.INVALID);
      }
  
      private Reader createReader(Feed feed) {
          Reader reader;
          try {
              reader = new XmlStreamReader(new File(feed.getFile_url()));
          } catch (FileNotFoundException e) {
              e.printStackTrace();
              return null;
          } catch (IOException e) {
              e.printStackTrace();
              return null;
          }
          return reader;
      }
  }
  