Blackbrry RSS feeds

With one Http connection and XML reader, it is pretty easy to make a rss application.

package com.weather.business;

import java.io.IOException;
import java.io.InputStream;

import javax.microedition.io.Connector;
import javax.microedition.io.HttpConnection;

import net.rim.device.api.system.ApplicationManager;
import net.rim.device.api.xml.parsers.SAXParser;
import net.rim.device.api.xml.parsers.SAXParserFactory;

import org.xml.sax.Attributes;
import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.SAXParseException;
import org.xml.sax.helpers.*;

public class FeedReader extends Thread {

final Feed feed;

public FeedReader()
{
this.feed = new Feed("http://weather.uwaterloo.ca/waterloo_weather_station_headlines.xml","http://weather.uwaterloo.ca/waterloo_weather_station_headlines.xml");
}

public void run ()
{
InputStream inputStrem = null;
HttpConnection httpConnection = null;

try
{
httpConnection = (HttpConnection) Connector.open(feed.getUrl());
inputStrem = httpConnection.openDataInputStream();

//finds if connection is good
if(httpConnection.getResponseCode() == HttpConnection.HTTP_OK)
{
String desiredEncoding = "ISO-8859-1"; //iso-8859-1
String contenttype = httpConnection.getHeaderField("Content-Type");

if(contenttype != null)
{
contenttype = contenttype.toUpperCase();
if (contenttype.indexOf("UTF-8") != -1)
{
desiredEncoding = "UTF-8";
}

InputSource is = new InputSource(inputStrem);
is.setEncoding(desiredEncoding);

// create the factory
SAXParserFactory factory = SAXParserFactory.newInstance();

// create a parser
SAXParser parser = factory.newSAXParser();

XMLHandler xmlHander = new XMLHandler(feed);
parser.parse(is, xmlHander);
}
}

}
catch (Exception err)
{
System.out.println(err.getMessage());
}
}
}

class XMLHandler extends DefaultHandler
{
StringBuffer sb = null;
Feed _feed = null;
Item item = null;
boolean bStarted = false;

XMLHandler(Feed feed)
{
_feed = feed;
}
public void warning(SAXParseException e)
{
System.err.println("warning: " + e.getMessage());
bStarted = false;
}
public void error(SAXParseException e)
{
System.err.println("error: " + e.getMessage());
}
public void fatalError(SAXParseException e)
{
System.err.println("fatalError: " + e.getMessage());
bStarted = false;
}
public void startDocument() throws SAXException
{
}
public void endDocument() throws SAXException
{
//ended
}

public void startElement(String namespaceURI, String localName,
String qName, Attributes atts) throws SAXException
{
sb = new StringBuffer("");
if (localName.equals("item"))
{
bStarted = true;

// new item, let's set up!
item = new Item();
}
}
public void endElement(String namespaceURI, String localName,
String qName) throws SAXException
{
System.out.println("");
System.out.println("endElement>> localName: "+localName+" sb: "+sb.toString());
System.out.println("");

if (bStarted == false) return;
if (localName.equals("item"))
{
item.setTitle(_feed.getName());
}
if (localName.equals("title"))
{
item.setTitle(sb.toString());
}
if (localName.equals("link"))
{
item.setLink(sb.toString());
}
if (localName.equals("description"))
{
item.setDescription(sb.toString());
}
if (localName.equals("category"))
{
item.setCategory(sb.toString());
}
if (localName.equals("pubDate"))
{
item.setPubDate(sb.toString());
}
sb = new StringBuffer("");
}
public void characters(char ch[], int start, int length)
{
String theString = new String(ch,start,length);
sb.append(theString);

System.out.println("characters: "+theString);

}
}

class Feed
{
final String feed_name;
final String feed_url;

public Feed(String feed_name, String feed_url)
{
this.feed_name = feed_name;
this.feed_url = feed_url;
}

public String getName() {
// TODO Auto-generated method stub
return feed_name;
}

public String getUrl()
{
return feed_url;
}

}

class Item
{
String pubDate;
String title;
String link;
String description;
String category;

public void setPubDate(String _pubDate) {
pubDate= _pubDate;

print(pubDate);
}

public void setTitle(String _title) {
title= _title;

print(title);
}

public void setLink(String _link) {
link = _link;

print(link);
}

public void setDescription(String _description) {
description = _description;

print(category);
}

public void setCategory(String _category) {
category = _category;

print(category);
}

private void print(String _print)
{
System.out.println(_print);
}
}