/**
  * Gets a Map of the FilterRegistration objects corresponding to all currently registered filters.
  */
 @Override
 @SuppressWarnings("unchecked") // doPrivileged() returns the correct type
 public Map<String, ? extends FilterRegistration> getFilterRegistrations() {
   if (SecurityUtil.isPackageProtectionEnabled()) {
     return (Map<String, FilterRegistration>) doPrivileged("getFilterRegistrations", null);
   } else {
     return context.getFilterRegistrations();
   }
 }