code: private int taintPriority(OpcodeStack.Item writing) {
          if (writing == null) {
              return Priorities.NORMAL_PRIORITY;
          }
          XMethod method = writing.getReturnValueOf();
          if (method != null && "getParameter".equals(method.getName())
                  && "javax.servlet.http.HttpServletRequest".equals(method.getClassName())) {
              return Priorities.HIGH_PRIORITY;
          }
          return Priorities.NORMAL_PRIORITY;
      }
docs: /*
  private boolean isDirectTaint(OpcodeStack.Item writing) {
  if (writing == null)
  return false;
  if (! writing.isServletParameterTainted())
  return false;
  XMethod m = writing.getReturnValueOf();
  if (m == null)
  return false;
  if (!m.getName().equals("getParameter"))
  return false;
  String clsName = m.getClassName();
  return  clsName.equals("javax/servlet/http/HttpServletRequest") || clsName.equals("javax/servlet/http/ServletRequest");
  }