/**
  * Returns all filters on a given txttools account
  * @global moodle_database $DB Moodle database controller 
  * @param TxttoolsAccount $txttoolsAccount Account to search against
  * @return TxttoolsAccount Updated account object
  * @version 2012042301
  * @since 2011070401
  */
 public function getFiltersForAccount(TxttoolsAccount $txttoolsAccount)
 {
     global $DB;
     $filters = $DB->get_records('block_moodletxt_filter', array('account' => $txttoolsAccount->getId()));
     // Iterate over filters and build beans
     foreach ($filters as $filter) {
         $filterObj = new MoodletxtInboundFilter($filter->account, $filter->type, $filter->value, $filter->id);
         $users = $DB->get_records_sql(self::$FETCH_INBOXES_SQL, array('filterid' => $filterObj->getId()));
         // Get links between filters and user inboxes
         foreach ($users as $user) {
             $filterObj->addDestinationUser(new MoodletxtBiteSizedUser($user->id, $user->username, $user->firstname, $user->lastname));
         }
         $txttoolsAccount->addInboundFilter($filterObj);
     }
     return $txttoolsAccount;
 }