Fluent::search_adapter PHP Method

    public static function search_adapter()
    {
        if (self::$_search_dapter) {
            return self::$_search_dapter;
        }
        foreach (self::config()->search_adapters as $connector => $adapter) {
            if ($connector && $adapter && DB::getConn() instanceof $connector) {
                return self::$_search_dapter = new $adapter();
            }
        }
    }

 public function augmentSQL(SQLQuery &$query, DataQuery &$dataQuery = null)
 {
     // Get locale and translation zone to use
     $locale = $dataQuery->getQueryParam('Fluent.Locale') ?: Fluent::current_locale();
     // Get all tables to translate fields for, and their respective field names
     $includedTables = $this->getTranslatedTables();
     // Iterate through each select clause, replacing each with the translated version
     foreach ($query->getSelect() as $alias => $select) {
         // Skip fields without table context
         if (!preg_match('/^"(?<class>\\w+)"\\."(?<field>\\w+)"$/i', $select, $matches)) {
             continue;
         }
         $class = $matches['class'];
         $field = $matches['field'];
         // If this table doesn't have translated fields then skip
         if (empty($includedTables[$class])) {
             continue;
         }
         // If this field shouldn't be translated, skip
         if (!in_array($field, $includedTables[$class])) {
             continue;
         }
         // Select visible field from translated fields (Title_fr_FR || Title => Title)
         $translatedField = Fluent::db_field_for_locale($field, $locale);
         $expression = $this->localiseSelect($class, $translatedField, $field);
         $query->selectField($expression, $alias);
     }
     // Rewrite where conditions
     $where = $query->getWhere();
     foreach ($where as $index => $condition) {
         // determine the table/column this condition is against
         $filterColumn = $this->detectFilterColumn($condition, $includedTables, $locale);
         if (empty($filterColumn)) {
             continue;
         }
         // Duplicate the condition with all localisable fields replaced
         $localisedCondition = $this->localiseFilterCondition($condition, $includedTables, $locale);
         if ($localisedCondition === $condition) {
             continue;
         }
         // Generate new condition that conditionally executes one of the two conditions
         // depending on field nullability.
         // If the filterColumn is null or empty, then it's considered untranslated, and
         // thus the query should continue running on the default column unimpeded.
         $where[$index] = "\n\t\t\t\t({$filterColumn} IS NOT NULL AND {$filterColumn} != '' AND ({$localisedCondition}))\n\t\t\t\tOR (\n\t\t\t\t\t({$filterColumn} IS NULL OR {$filterColumn} = '') AND ({$condition})\n\t\t\t\t)";
     }
     $query->setWhere($where);
     // Augment search if applicable
     if ($adapter = Fluent::search_adapter()) {
         $adapter->augmentSearch($query, $dataQuery);
     }
 }