parser.java

android开发入门与实践源代码

package us.imnet.iceskysl.xspf;

import java.io.InputStream;
import java.net.URL;
import java.net.URLConnection;

import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;

import org.xml.sax.Attributes;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.XMLReader;
import org.xml.sax.helpers.DefaultHandler;

import android.util.Log;

public class Parser extends DefaultHandler {

	private String playlistUrl = null;
	private Playlist playlist = null;

	/**
	 * @return the playlist
	 */
	public Playlist getPlaylist() {
		return playlist;
	}

	/**
	 * @param playlist
	 *            the playlist to set
	 */
	public void setPlaylist(Playlist playlist) {
		this.playlist = playlist;
	}

	/**
	 * @return the ready
	 */
	public boolean isReady() {
		return ready;
	}

	private Track track = null;

	private final static String KEY_TITLE = "title";
	private final static String KEY_ANNOTATION = "annotation";
	private final static String KEY_CREATOR = "creator";
	private final static String KEY_ALBUM = "album";
	private final static String KEY_INFO = "info";
	private final static String KEY_LOCATION = "location";
	private final static String KEY_LICENSE = "license";

	private final static String KEY_IMAGE = "image";
	private final static String KEY_TRACKLIST = "trackList";
	private final static String KEY_PLAYLIST = "playlist";

	private final static String KEY_TRACK = "track";

	private final static String KEY_IDENTIFIER = "identifier";

	private final static String TAG = "Parser";

	private String currElement = "";

	private boolean ready = false;

	/*
	 * <title>My playlist</title> <annotation></annotation> <creator>Avril
	 * Rocks</creator> <info>http://webjay.org/by/Avril Rocks/myplaylist</info>
	 * <location>http://webjay.org/by/Avril Rocks/myplaylist.xspf</location>
	 * <license>http://creativecommons.org/licenses/by-sa/1.0/</license>
	 */

	/*
	 * <trackList> <track>
	 * <location>http://a425.v8384d.c8384.g.vm.akamaistream.net
	 * /7/426/8384/3b858b51
	 * /mtvrdstr.download.akamai.com/8512/wmp/3/21722/30225_1_11_05
	 * .asf</location> <annotation>Simple Plan - Untitled</annotation>
	 * 
	 * </track> </tracjList>
	 */
	/**
	 * @param args
	 */
	public static void main(String[] args) throws Exception {

		String url = "http://webjay.org/by/Avril%20Rocks/myplaylist.xspf";
		Parser parser = new Parser(url);
		parser.parse();

//		 System.out.println ("Got Playlist: " + playlist.getTitle());
//		 System.out.println ("Track Count: " + playlist.getTracks().size());

	}

	public Parser(String playlistUrl) {
		this.playlistUrl = playlistUrl;

	}

	public void parse() throws Exception {
		SAXParserFactory spf = SAXParserFactory.newInstance();
		SAXParser sp = spf.newSAXParser();
		XMLReader xr = sp.getXMLReader();
		xr.setContentHandler(this);
		InputStream is = null;
		URL url = new URL(playlistUrl);
		URLConnection uc = url.openConnection();
		is = uc.getInputStream();
		playlist = new Playlist();
		ready = false;
		xr.parse(new InputSource(is));
	}

	public void startElement(String uri, String name, String qName,
			Attributes atts) {

		// if (name.trim().equals("title"))
		// inTitle = true;

		currElement = name;

		if (currElement.equals(KEY_TRACK))
			track = new Track();
	}

	public void endElement(String uri, String name, String qName)
			throws SAXException {

		if (name.equals(KEY_TRACK)) {
			playlist.addTrack(track);
			track = null;
		} else if (name.equals(KEY_TRACKLIST)) {
			// tracks done
		} else if (name.equals(KEY_PLAYLIST)) {
			// playlist done
			ready = true;
		}

		currElement = null;

	}

	public void characters(char ch[], int start, int length) {

		String chars = (new String(ch).substring(start, start + length));
		chars = chars.trim();

		try {

			if (currElement != null) {
				if (track != null) {
					// node2 = node.getChild(,ns);
					if (currElement.equals(KEY_LOCATION)) {
						if (chars.startsWith("http"))
							track.setLocation(chars);
					} else if (currElement.equals(KEY_ANNOTATION))
						track.setAnnotation(chars);

					else if (currElement.equals(KEY_IMAGE))
						track.setImage(chars);

					else if (currElement.equals(KEY_INFO))
						track.setInfo(chars);

					else if (currElement.equals(KEY_CREATOR))
						track.setCreator(chars);

					else if (currElement.equals(KEY_IDENTIFIER))
						track.setIdentifier(chars);

					else if (currElement.equals(KEY_CREATOR))
						track.setCreator(chars);

					else if (currElement.equals(KEY_ALBUM))
						track.setAlbum(chars);

					else if (currElement.equals(KEY_TITLE))
						track.setTitle(chars);

				} else {
					if (currElement.equals(KEY_TITLE))
						playlist.setTitle(chars);
					else if (currElement.equals(KEY_ANNOTATION))
						playlist.setAnnotation(chars);
					else if (currElement.equals(KEY_CREATOR))
						playlist.setCreator(chars);
					else if (currElement.equals(KEY_INFO))
						playlist.setInfo(chars);
					else if (currElement.equals(KEY_LICENSE))
						playlist.setLicense(chars);
				}
			}

		} catch (Exception e) {
			Log.e(TAG, e.toString());
		}

	}



}