YAHOONewsService.java

package org.primefaces.examples.service;

import java.net.URL;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.logging.Level;
import java.util.logging.Logger;

import org.primefaces.examples.domain.NewsEntry;
import org.primefaces.examples.domain.NewsGroup;

import com.sun.syndication.feed.synd.SyndEntry;
import com.sun.syndication.feed.synd.SyndFeed;
import com.sun.syndication.io.SyndFeedInput;
import com.sun.syndication.io.XmlReader;

public class YAHOONewsService implements NewsService {
	
	private static final Logger logger = Logger.getLogger(YAHOONewsService.class.getName());
	
	private Map<String,String> feeds;
	
	public YAHOONewsService() {
		feeds = new HashMap<String, String>();
		feeds.put("Top Stories", "http://rss.news.yahoo.com/rss/topstories");
		feeds.put("World", "http://rss.news.yahoo.com/rss/world");
		feeds.put("Technology", "http://rss.news.yahoo.com/rss/tech");
		feeds.put("Sports", "http://rss.news.yahoo.com/rss/sports");
		feeds.put("Entertainment", "http://rss.news.yahoo.com/rss/entertainment");
		feeds.put("Business", "http://rss.news.yahoo.com/rss/business");
		feeds.put("Politics", "http://rss.news.yahoo.com/rss/politics");
	}

	public List<NewsGroup> fetchNews() {
		List<NewsGroup> news = new ArrayList<NewsGroup>();
		try {
			for(String key : feeds.keySet()) {
				URL feedSource = new URL(feeds.get(key));
				SyndFeedInput input = new SyndFeedInput();
				SyndFeed feed = input.build(new XmlReader(feedSource));
				List<NewsEntry> entries = new ArrayList<NewsEntry>();
				
				int i = 0;
				for(Object f : feed.getEntries()) {
					SyndEntry entry = (SyndEntry) f;
                    String title = entry.getTitle();
                    title = title.length() <= 25 ? title : title.substring(0, 25);
					entries.add(new NewsEntry(i, title + "...", entry.getDescription().getValue()));
					i++;
				}
				
				news.add(new NewsGroup(key, entries)); 
			}
		
		} catch(Exception exception) {
			logger.log(Level.SEVERE, "Error in retrieving news from YAHOO: {0}", exception.getMessage());
		}
		
		return news;
	}

}