RssReader.java

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/*
 * Turró i Cutiller Foundation. License notice.
 * Copyright (C) 2011 Lluis Turró Cutiller <http://www.turro.org/>
 *
 * This program is free software: you can redistribute it and/or modify
 * it under the terms of the GNU Affero General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * This program is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Affero General Public License for more details.
 *
 * You should have received a copy of the GNU Affero General Public License
 * along with this program.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.turro.elephant.impl.feed;
 
import com.sun.syndication.feed.synd.SyndFeed;
import com.sun.syndication.io.FeedException;
import com.sun.syndication.io.SyndFeedInput;
import com.sun.syndication.io.XmlReader;
import java.io.IOException;
import java.io.PrintWriter;
import java.net.MalformedURLException;
import java.net.URL;
import javax.servlet.ServletException;
import org.turro.elephant.context.IElement;
import org.turro.elephant.impl.abstracts.AbstractElement;
import org.turro.elephant.impl.util.Localizer;
import org.turro.elephant.layout.IManageable;
import org.turro.elephant.layout.IRenderable;
import org.turro.marker.ElephantMarker;
 
public class RssReader extends AbstractElement implements IElement, IRenderable, IManageable {
  protected Localizer localizer;
  
  public RssReader() {
    super();
  }
  
  @Override
  public void startConstruction() throws ServletException, IOException {
    localizer = getConstructor().getLocalizer();
    PrintWriter out = getConstructor().getOut();
    out.print(getStart());
    out.print(getStartBody());
    String url[] = getAttributes().getAttributeValue("attrib:feed", "").split(",");
    SyndFeedInput input = new SyndFeedInput();
    try {
      SyndFeed feed;
      for(int i = 0; i < url.length; i++) {
        feed = input.build(new XmlReader(new URL(url[i])));
        renderFeed(out, feed);
      }
    } catch (MalformedURLException | IllegalArgumentException | FeedException ex) {
      throw new ServletException(ex);
    }
    out.print(getEndBody());
    out.print(getEnd());
  }
 
  @Override
  public String getStart() {
    return "<div class='rssreader'>";
  }
 
  @Override
  public String getEnd() {
    return "</div>";
  }
 
  private void renderFeed(PrintWriter out, SyndFeed feed) {
    ElephantMarker marker = new ElephantMarker(getConstructor());
    marker.put("feed", feed);
    marker.process("rss", "feed");
  }
}