SAXParser

package com.RSSReader.parser;

import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.text.ParseException;
import java.text.SimpleDateFormat;
import java.util.Calendar;
import java.util.Date;

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

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

public class RssParser extends DefaultHandler {
/**
* The constructor for the RSS Parser
*
* @param url
*/
public RssParser(String url) {
this.urlString = url;
this.text = new StringBuilder();
}

/**
* Returns the feed as a RssFeed, which is a ListArray
*
* @return RssFeed rssFeed
*/
public Channel getChannel() {
return (this.channel);
}

public void parse() throws ParserConfigurationException, SAXException,
IOException {
InputStream urlInputStream = null;
SAXParserFactory spf = null;
SAXParser sp = null;
URL url = new URL(this.urlString);
urlInputStream = url.openConnection().getInputStream();
spf = SAXParserFactory.newInstance();
if (spf != null) {
sp = spf.newSAXParser();
sp.parse(urlInputStream, this);
}
if (urlInputStream != null)
urlInputStream.close();
}

public void startElement(String uri, String localName, String qName,
Attributes attributes) {

/** First lets check for the channel */
if (localName.equalsIgnoreCase("channel")) {
this.channel = new Channel();
}

/** Now lets check for an item */
if (localName.equalsIgnoreCase("item") && (this.channel != null)) {
this.item = new Item();
this.channel.addItem(this.item);
}

/** Now lets check for an image */
if (localName.equalsIgnoreCase("image") && (this.channel != null)) {
this.imgStatus = true;
}

}

/**
* This is where we actually parse for the elements contents
*/
public void endElement(String uri, String localName, String qName) {
/** Check we have an RSS Feed */
if (this.channel == null) {
return;
}

/** Check are at the end of an item */
if (localName.equalsIgnoreCase("item")) {
this.item = null;
}

/** Check we are at the end of an image */
if (localName.equalsIgnoreCase("image"))
this.imgStatus = false;

/** Now we need to parse which title we are in */
if (localName.equalsIgnoreCase("title")) {
/** We are an item, so we set the item title */
if (this.item != null) {
this.item.setTitle(this.text.toString().trim());
/** We are in an image */
} else {
this.channel.setName(this.text.toString().trim());
}
}

/** Now we are checking for a link */
if (localName.equalsIgnoreCase("link")) {
/** Check we are in an item * */
if (this.item != null) {
this.item.setUrl(this.text.toString().trim());
/** Check we are in an image */
} else if (this.imgStatus) {
// this.channel.setImage(this.text.toString().trim());
/** Check we are in a channel */
} else {
this.channel.setUrl(this.text.toString().trim());
}
}

/** Now we are checking for a logo of channel */
if (localName.equalsIgnoreCase("url")) {
if (this.imgStatus && this.channel != null) {
this.channel.setLogoUrl(this.text.toString().trim());
}
}

/** Checking for a description */
if (localName.equalsIgnoreCase("description")) {
/** Lets check we are in an item */
if (this.item != null) {
String des = this.text.toString().trim();
this.item.setDescription(des);

/** Lets check we are in the channel */
} else {
// this.channel.setDescription(this.text.toString().trim());
}
}

/** Checking for a publish date */
if (localName.equalsIgnoreCase("pubDate")) {
/** Lets check we are in an item */
if (this.item != null) {
Date publishDate = getDateTime(this.text.toString().trim());
this.item.setPublishDate(publishDate);
/** Lets check we are in the channel */
} else {
}
}



this.text.setLength(0);
}

public void characters(char[] ch, int start, int length) {
this.text.append(ch, start, length);
}

public static final String RSS_FORMAT_DATE = "EEE, d MMM yyyy hh:mm:ss Z";

public static Date getDateTime(String value) {
SimpleDateFormat formatter = new SimpleDateFormat(RSS_FORMAT_DATE);
Date date;
try {
date = formatter.parse(value);
} catch (ParseException e) {
date = Calendar.getInstance().getTime();
}
return date;
}

private String urlString;
private Channel channel;
private StringBuilder text;
private Item item;
private boolean imgStatus;
}