@Override
 public void add(final Collection<? extends IParameter> params, final IAgent agent) {
   for (final IParameter var : params) {
     IParameterEditor gp = GuiUtils.getEditorFactory().create((IAgent) null, var, null);
     String cat = var.getCategory();
     cat = cat == null ? "General" : cat;
     addItem(cat);
     categories.get(cat).put(gp.getParam().getName(), gp);
   }
 }
  /**
   * Analyze and categorize each of the parameters in scope.
   *
   * @param helpers The standard burp ExtensionHelpers object.
   * @param messages The set of request messages to be processed.
   */
  private void firstPass(IExtensionHelpers helpers, IHttpRequestResponse[] messages) {
    publish("Examining parameters...");
    for (int i = 0; i < messages.length; i++) {
      publish(100 * i / messages.length);
      messages[i].getHttpService();
      //  Analyze response for cookies
      if (messages[i].getResponse() != null) {
        IResponseInfo responseInfo = helpers.analyzeResponse(messages[i].getResponse());
        List<String> headers = responseInfo.getHeaders();
        for (String header : headers) {
          if (startsWithIgnoreCase(header, "set-cookie:")) {
            processCookieHeader(header);
          }
        }
      }
      IRequestInfo requestInfo = helpers.analyzeRequest(messages[i]);
      if (callbacks.isInScope(requestInfo.getUrl())) {
        byte[] responseBytes = messages[i].getResponse();
        String responseString = "";
        if (responseBytes != null) {
          responseString = helpers.bytesToString(responseBytes);
          inScopeMessagesWithResponses.add(messages[i]);
        }

        List<IParameter> params = requestInfo.getParameters();
        for (IParameter param : params) {
          if ((!ignoreEmpty || param.getValue().length() > 0)
              && !ignoreList.contains(param.getName())) {
            int type = param.getType();
            Map<String, CorrelatedParam> paramMap;
            switch (type) {
              case IParameter.PARAM_URL:
                paramMap = urlParameters;
                break;
              case IParameter.PARAM_BODY:
                paramMap = bodyParameters;
                break;
              case IParameter.PARAM_COOKIE:
                paramMap = cookieParameters;
                break;
              case IParameter.PARAM_JSON:
                paramMap = jsonParameters;
                break;
              default:
                paramMap = null;
                // nothing
            }

            if (paramMap != null) {
              if (messages[i] == null) {
                callbacks.printOutput("Warning... adding null message!");
              }

              if (paramMap.containsKey(param.getName())) {
                paramMap
                    .get(param.getName())
                    .put(param, messages[i], requestInfo, responseString, helpers);
              } else {
                paramMap.put(
                    param.getName(),
                    new CorrelatedParam(param, messages[i], requestInfo, responseString, helpers));
              }
            }
          }
        }
      }
    }
  }