Android Open Source - bbcplayer Xml Parser

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License

The source code is released under:

GNU General Public License

Java Source Code

/*
 * Class used to create an xml parser (XmlPullParser)
 * Parser will read the bbc page and create a list of entries
 *///  w  w  w.  j  a  v  a2  s . c  om

package com.rmgoncalo.bbcplayer;

import java.io.IOException;
import java.io.InputStream;
import java.io.StringReader;
import java.util.ArrayList;
import java.util.List;

import org.xmlpull.v1.XmlPullParser;
import org.xmlpull.v1.XmlPullParserException;
import org.xmlpull.v1.XmlPullParserFactory;

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

public class XmlParser {

  private static final String logtag = "XmlParser";

  private static final String TITLE_TAG = "title";
  private static final String ID_TAG = "id";
  private static final String UPDATED_TAG = "updated";
  private static final String CONTENT_TAG = "content";

  private static final String ns = null;

  public List<Entry> parse(InputStream in) throws XmlPullParserException,
      IOException {
    try {
      XmlPullParser parser = Xml.newPullParser();
      parser.setFeature(XmlPullParser.FEATURE_PROCESS_NAMESPACES, false);
      parser.setInput(in, null);
      parser.nextTag();
      return readFeed(parser);
    } finally {
      in.close();
    }
  }

  private List<Entry> readFeed(XmlPullParser parser)
      throws XmlPullParserException, IOException {
    List<Entry> entries = new ArrayList<Entry>();

    parser.require(XmlPullParser.START_TAG, ns, "feed");
    while (parser.next() != XmlPullParser.END_TAG) {
      if (parser.getEventType() != XmlPullParser.START_TAG) {
        continue;
      }
      String name = parser.getName();
      // Starts by looking for the entry tag
      if (name.equals("entry")) {
        entries.add(readEntry(parser));
      } else {
        skip(parser);
      }
    }

    return entries;
  }

  private Entry readEntry(XmlPullParser parser)
      throws XmlPullParserException, IOException {
    parser.require(XmlPullParser.START_TAG, ns, "entry");

    Entry entry = new Entry();

    while (parser.next() != XmlPullParser.END_TAG) {
      if (parser.getEventType() != XmlPullParser.START_TAG) {
        continue;
      }
      String name = parser.getName();
      if (name.equals(TITLE_TAG)) {
        entry.setTitle(readTag(TITLE_TAG, parser));
      } else if (name.equals(ID_TAG)) {
        entry.setId(readTag(ID_TAG, parser));
      } else if (name.equals(UPDATED_TAG)) {
        entry.setUpdated(readTag(UPDATED_TAG, parser));
      } else if (name.equals(CONTENT_TAG)) {
        entry.setContent(readTag(CONTENT_TAG, parser));
      } else {
        skip(parser);
      }
    }

    // assign thumb link to thumb variable
    entry.setThumb(parseThumbLink(entry.getContent()));

    //assign score to rtscore variable
    //JsonParser jp = new JsonParser();
    //jp.setUrl(Util.formatURLString(entry.getTitle()));
    //jp.start();
    
    //entry.setRtscore(jp.getScore());
    //Log.d(logtag, "score: " + entry.getRtscore());

    return entry;
  }

  // General method to process the tag's content in the feed
  private String readTag(String tag, XmlPullParser parser)
      throws IOException, XmlPullParserException {
    parser.require(XmlPullParser.START_TAG, ns, tag);
    String s = readText(parser);
    parser.require(XmlPullParser.END_TAG, ns, tag);

    // Log.d(logtag, "readTag: " + s);

    return s;
  }

  // Extracts text values from the tags.
  private String readText(XmlPullParser parser) throws IOException,
      XmlPullParserException {
    String result = "";
    if (parser.next() == XmlPullParser.TEXT) {
      result = parser.getText();
      parser.nextTag();
    }
    return result;
  }

  private void skip(XmlPullParser parser) throws XmlPullParserException,
      IOException {
    if (parser.getEventType() != XmlPullParser.START_TAG) {
      throw new IllegalStateException();
    }
    int depth = 1;
    while (depth != 0) {
      switch (parser.next()) {
      case XmlPullParser.END_TAG:
        depth--;
        break;
      case XmlPullParser.START_TAG:
        depth++;
        break;
      }
    }
  }

  /*
   * Parse 'content'
   * 
   * Logs used to debug
   */
  public String parseThumbLink(String str) throws XmlPullParserException,
      IOException {
    String src = null;

    XmlPullParserFactory factory = XmlPullParserFactory.newInstance();
    factory.setNamespaceAware(true);
    XmlPullParser xpp = factory.newPullParser();

    xpp.setInput(new StringReader(str));
    int eventType = xpp.getEventType();
    while (eventType != XmlPullParser.END_DOCUMENT) {
      if (eventType == XmlPullParser.START_DOCUMENT) {
        // Log.d(logtag, "Start document");
      } else if (eventType == XmlPullParser.START_TAG) {
        // Log.d(logtag, "Start tag " + xpp.getName());
        if (xpp.getName().equals("img")) {
          src = xpp.getAttributeValue(null, "src");
          Log.d(logtag, "src: " + xpp.getAttributeValue(null, "src"));
        }
      } else if (eventType == XmlPullParser.END_TAG) {
        // Log.d(logtag, "End tag " + xpp.getName());
      } else if (eventType == XmlPullParser.TEXT) {
        // Log.d(logtag, "Text " + xpp.getText());
      }
      eventType = xpp.next();
    }

    return src;
  }
}

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