package uk.ac.ebi.intenz.webapp.controller;
   
   import java.io.IOException;
   
   import javax.servlet.ServletException;
   
   import uk.ac.ebi.xchars.SpecialCharacters;
   
   /**
   * This class provides methods to switch between a pure Unicode based special character
   * representation and a browser dependent non-pure Unicode encoding.
   *
   * @author Michael Darsow
   * @version 0.9 - 21-July-2003
   */
  public class ChangeCharacterRepresentationCommand extends NonDatabaseCommand {
  
    /**
     * Depending on the given parameter this method switches between a Unicode representation for some
     * <i>very</i> special characters (scissile, activated, ...) and a browser-dependent encoding.
     * <p/>
     * This class makes use of the Special Characters API, which allows to define a representation for
     * special characters in different ways. See documentation (TODO: Insert link here).
     *
     * @throws ServletException
     * @throws IOException
     */
    public void process() throws ServletException, IOException {
      boolean unicodeOnly = request.getParameter("uo").equals("true");
  
  //    SpecialCharacters specialCharacters = (SpecialCharacters) request.getSession().getServletContext().getAttribute(
  //            "characters");
  //    SpecialCharacters specialCharactersCopy = SpecialCharacters.copy(specialCharacters);
  
  //    if (unicodeOnly) { // Use default setting (which is mainly Unicode).
  //      specialCharactersCopy.setMappingIdentifier(null);
  //      request.getSession().setAttribute("uo", "true");
  //    } else {
  //      specialCharactersCopy.setMappingIdentifier("defaultAlt");
  //      request.getSession().setAttribute("uo", "false");
  //    }
  
      request.setAttribute("info", getInfo(unicodeOnly));
      forward("/info.jsp");
    }
  
    /**
     * Returns the content for the info page.
     *
     * @param unicodeOnly Use default encoding if set to <code>true</code>.
     * @return the HTML info.
     */
    private String getInfo(boolean unicodeOnly) {
      StringBuffer info = new StringBuffer();
  
      info.append("<form action=\"query?cmd=ChangeCharacterRepresentation\" method=\"post\">");
      info.append("<table width=\"100%\" border=\"0\" cellpadding=\"0\" cellspacing=\"0\">\n");
      info.append("  <tr>\n");
  
      if (!unicodeOnly) {
        info.append("    <td>You have switched to individual encoding (browser-dependent and font-independent) of " +
                    "special characters. Some characters may now be displayed as images, depending on the browser version " +
                    "you use. If you want to use the default encoding again, press the button below this text.</td></tr>\n");
        info.append("<tr><td>&nbsp;</td></tr>\n");
        info.append("      <tr><td align=\"center\"><input type=\"submit\" value=\"Switch to default encoding\">\n" +
                    "      <input type=\"hidden\" name=\"uo\" value=\"true\"></td>\n");
      } else {
        info.append("    <td>You have switched to the default encoding for special characters. The default encoding uses " +
                    "Unicode to display special characters and works best with current browser versions. Please check if you " +
                    "have a Unicode font installed and if you can see all " +
                    "<a href=\"javascript:windowOpenWithSize('encoding.html', 280, 400)\">special characters</a> used within " +
                    "IntEnz. If you cannot see all characters or if you are not happy with the representation then press the " +
                    "button below to enable individual encoding (browser-dependent and font-independent).</td></tr>\n");
        info.append("<tr><td>&nbsp;</td></tr>\n");
        info.append("      <tr><td align=\"center\"><input type=\"submit\" value=\"Switch to individual encoding\">\n" +
                    "      <input type=\"hidden\" name=\"uo\" value=\"false\"></td>\n");
      }
  
      info.append("  </tr>");
      info.append("</table>");
      info.append("</form>");
      return info.toString();
    }
  
  }