rssreader.java

webwork source

/*
 * WebWork, Web Application Framework
 *
 * Distributable under Apache license.
 * See terms of license at opensource.org
 */
package webwork.examples.jdom;

import java.net.URL;
import java.net.MalformedURLException;
import java.util.List;

import org.jdom.Document;
import org.jdom.Element;
import org.apache.commons.logging.*;
import webwork.util.ClassLoaderUtils;

/**
 *	Used to access the RSS file containing the feed sources
 *
 *	@author Maurice C. Parker ([e-mail])
 *	@version $Revision: 1.4 $
 */
public class RssReader
   extends JDOMUrl
{
   // Attributes ----------------------------------------------------
   Element channel;
   List items;

   // Public --------------------------------------------------------
   public Element getChannel()
   {
      return channel;
   }

   public List getItems()
   {
      return items;
   }

   protected String doExecute()
      throws Exception
   {
      URL xmlUrl;
      try
      {
         //log.info("url="+url);
         xmlUrl = new URL(url);
      } catch (MalformedURLException e)
      {
         try {
            //try and build the url from request
            xmlUrl = new URL(buildUrl(url));
         } catch (MalformedURLException e1) {
            // Not a real URL
            // Try as resource
            xmlUrl = ClassLoaderUtils.getResource(url, RssReader.class);
            if (xmlUrl == null)
            {
               addError("url", "Not a valid URL");
               return ERROR;
            }
         }
      }

      // Feed it back so that it can be accessed
      String oldUrl = url;
      url = xmlUrl.toString();

      String result;
      try
      {
         // Get document
         result = super.doExecute();
      } finally
      {
         // Reset URL
         url = oldUrl;
      }

      // Handle the various versions
      if (document.getRootElement().getName().equals("rss"))
      {
         // RSS 0.91
         channel = document.getRootElement().getChild("channel");
         items = channel.getChildren("item");
      } else if (document.getRootElement().getName().equals("rdf"))
      {
         // RDF 1.0
         channel = document.getRootElement().getChild("channel");
         items = document.getRootElement().getChildren("item");
      }

      return result;
   }
}