Android Open Source - AndroidDev Xml Pull Feed Parser

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License

The source code is released under:
GNU General Public License
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Java Source Code

package nl.componentagro.feedparser;
/*w  ww . jav a 2  s  . c o m*/
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

import org.xmlpull.v1.XmlPullParser;

import android.util.Log;
import android.util.Xml;

public class XmlPullFeedParser extends BaseFeedParser {

  private class Channel {
     private ImageRef image;

    public ImageRef getImage() {
      if (image == null) {
        image = new ImageRef();
      }
      return image;
    }
  }
  
  public XmlPullFeedParser(String feedUrl) {
    super(feedUrl);
  }

  private void parseImageNode(XmlPullParser parser, ImageRef image) throws Exception {
    int eventType = parser.getEventType();
    boolean done = false;
    while (eventType != XmlPullParser.END_DOCUMENT && !done) {
      switch (eventType) {  
        case XmlPullParser.START_TAG:
          if (parser.getName().equalsIgnoreCase(URL)) {
            image.url = parser.nextText();
          } else if (parser.getName().equalsIgnoreCase(TITLE)) {
            image.title = parser.nextText();
          }          
          break;
        case XmlPullParser.END_TAG:    
          if (parser.getName().equalsIgnoreCase(IMAGE)) {
            done = true;
          }
          break;
      }
      eventType = parser.next();
    }
  }
  
  private List<Message> parseStream(InputStream stream) {
    List<Message> messages = null;
    XmlPullParser parser = Xml.newPullParser();
    try {
      // auto-detect the encoding from the stream
      parser.setInput(stream, null);
      int eventType = parser.getEventType();
      Message currentMessage = null;
      Channel currentchannel = null;
      boolean done = false;
      while (eventType != XmlPullParser.END_DOCUMENT && !done){
        String name = null;
        switch (eventType){
          case XmlPullParser.START_DOCUMENT:
            messages = new ArrayList<Message>();
            break;
          case XmlPullParser.START_TAG:
            name = parser.getName();
            if (name.equalsIgnoreCase(CHANNEL)) {
              currentchannel = new Channel();
            } else if (currentchannel != null) {
              if (name.equalsIgnoreCase(IMAGE)) {
                // image retrieval
                if (currentMessage != null) {
                  parseImageNode(parser, currentMessage.getImage());
                } else {
                  parseImageNode(parser, currentchannel.getImage());
                }
              } else if (name.equalsIgnoreCase(ITEM)) {
                currentMessage = new Message();
                // Apply a custom dateformat to the message  (If needed)
                if (hasCustomDateFormat()) {
                  currentMessage.setDateFormat(customdateformat);
                }
              } else if (currentMessage != null) {
                if (name.equalsIgnoreCase(LINK)) {
                  currentMessage.setLink(parser.nextText());
                } else if (name.equalsIgnoreCase(DESCRIPTION)){
                  currentMessage.setDescription(parser.nextText());
                } else if (name.equalsIgnoreCase(PUB_DATE)){
                  currentMessage.setDateStr(parser.nextText());
                } else if (name.equalsIgnoreCase(TITLE)){
                  currentMessage.setTitle(parser.nextText());
                }  
              }              
            }
            break;
          case XmlPullParser.END_TAG:
            name = parser.getName();
            if (name.equalsIgnoreCase(ITEM) && currentMessage != null) {
              if (currentchannel != null && !currentMessage.hasImage()) {
                currentMessage.setImage(currentchannel.getImage());
              }
              messages.add(currentMessage);
              currentMessage = null;
            } else if (name.equalsIgnoreCase(CHANNEL) && currentchannel != null){
              currentchannel = null;
            }
            break;
        }
        eventType = parser.next();
      }
    } catch (Exception e) {
      Log.e("AndroidNews::PullFeedParser", e.getMessage(), e);
      throw new RuntimeException(e);
    }
    return messages;    
  }
  
  public List<Message> parse() {
    return parseStream(this.getInputStream());
  }
  
  public List<Message> parse(String postdata) {
    return parseStream(this.getInputStream(postdata));
  }
}
Java Source Code List
