/**
 * 
 */
package at.gv.egiz.pdfas.web.helper;

import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpSession;

import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;

import at.gv.egiz.pdfas.exceptions.web.SessionExpiredException;
import at.knowcenter.wag.egov.egiz.web.SessionAttributes;

/**
 * @author wprinz
 * 
 */
public class SessionHelper
{
  /**
   * The log.
   */
  private static Log log = LogFactory.getLog(SessionHelper.class);

  public static Object getSession(HttpServletRequest request) throws SessionExpiredException
  {

    HttpSession session = request.getSession(false);
    if (session == null)
    {
      String msg = "There is no session associated with this request."; //$NON-NLS-1$
      log.error(msg);
      throw new SessionExpiredException(msg);
    }

    Object sessionObject = session.getAttribute(SessionAttributes.ATTRIBUTE_SESSION_INFORMATION);
    if (sessionObject == null)
    {
      String msg = "Unable to find session data in session " + session.getId();
      log.error(msg);
      throw new SessionExpiredException(msg);
    }

    return sessionObject;
  }
}