package uk.ac.ebi.intenz.webapp.controller;
   
   import java.io.IOException;
   import java.io.InputStream;
   import java.net.URL;
   import java.net.URLConnection;
   import javax.servlet.ServletException;
   import javax.servlet.http.HttpServlet;
   import javax.servlet.http.HttpServletRequest;
  import javax.servlet.http.HttpServletResponse;
  
  import org.apache.log4j.Logger;
  import uk.ac.ebi.intenz.webapp.IntEnzConfig;
  
  /**
   * Simple servlet which reads an external sitemap file and writes it as is to
   * the response. This is needed in order to have the sitemap decoupled from
   * the war file, as the sitemap specs require it to be under the same base
   * URL as the indexed URLs.
   */
  public class SitemapServlet extends HttpServlet {
  
  	private Logger LOGGER = Logger.getLogger(SitemapServlet.class);
  
      public void service(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, IOException {
          response.setContentType("application/gzip");
          LOGGER.info("Getting URL connection to sitemap...");
          URL url = null;
          IntEnzConfig config = (IntEnzConfig) request.getSession()
                  .getServletContext().getAttribute("intenzConfig");
          url = new URL(config.getSitemapUrl());
          URLConnection con = url.openConnection(java.net.Proxy.NO_PROXY);
          LOGGER.info("Connecting to sitemap...");
          //con.connect();
          LOGGER.info("Connected");
          InputStream is = null;
          try {
              is = con.getInputStream();
              int r = -1;
              LOGGER.debug("Starting to read sitemap...");
              while ((r = is.read()) != -1){
                  response.getOutputStream().write(r);
              }
              response.getOutputStream().flush();
              response.flushBuffer();
              LOGGER.debug("... Read and served");
          } finally {
              if (is != null) is.close();
          }
      }
  }