/*
 * Created on 01.12.2003
 *
 * (c) Stabsstelle IKT-Strategie des Bundes
 */
package at.gv.egovernment.moa.spss.slinterface.servlets;

import java.io.FileInputStream;
import java.io.OutputStream;

import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;

import org.apache.log4j.Logger;

import at.gv.egovernment.moa.spss.slinterface.Constants;
import at.gv.egovernment.moa.spss.slinterface.Utils;
import at.gv.egovernment.moa.spss.slinterface.beans.DataInfoBean;

/**
 * @author Gregor Karlinger (mailto:gregor.karlinger@cio.gv.at) 
 */
public class HashInputDataServlet extends HttpServlet
{
  private static Logger logger_ = Logger.getLogger(Constants.LH_SERVLETS_);

  /**
   * Default constructor.
   */
  public HashInputDataServlet()
  {
    super();
  }

  public void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException
  {
    // Get DataInfoBean object from session
    HttpSession session = request.getSession(false);
    if (session == null)
    {
      String message = "No session available.";
      logger_.error(message);
      throw new ServletException(message);
    }
    DataInfoBean dataInfo = (DataInfoBean) session.getAttribute("dataInfo");
    
    // Get parameter inicating which hash input data file to show
    String hidCountStr = request.getParameter("hidCount");
    if (hidCountStr == null)
    {
      String message = "Parameter \"hidCount\" not available in request.";
      logger_.error(message);
      throw new ServletException(message);
    }
    int hidCount = -1;
    try
    {
      hidCount = Integer.parseInt(hidCountStr);
    }
    catch (NumberFormatException e)
    {
      String message = "Parameter \"hidCount\" (\"" + hidCount + "\") is not a valid string representation of an integer.";
      logger_.error(message, e);
      throw new ServletException(message, e);
    }

    // Get file name of temporary HID file
    dataInfo.setHashInputDataCount(hidCount);
    String hidFilename = dataInfo.getHashInputDataFilename();
    
    // Set content type
    boolean isSLXHTML = dataInfo.getIsSLXHTMLDocument();
    String contenType = (isSLXHTML) ? "text/html" : "application/octet-stream";
    response.setContentType(contenType);
    
    // Write content from temporary HID file to response OS
    try
    {
      FileInputStream hidFIS = new FileInputStream(hidFilename);
      OutputStream responseOS = response.getOutputStream();
      Utils.transferStreams(hidFIS, responseOS);
    }
    catch (Exception e)
    {
      String message = "Writing hash input data to response stream failed.";
      logger_.error(message, e);
      throw new ServletException(message, e);
    }
  }
}