/**
  * Enable filters
  *
  * @return $this
  */
 protected function _enableFilters()
 {
     // Loop through the registered filters
     foreach ($this->filters['registered'] as $key => $class) {
         // Set the filter inside the reader when enabled and the class exists
         if (in_array($key, $this->filters['enabled']) && class_exists($class)) {
             // init new filter (and overrule the current)
             $this->filter = new $class();
             // Set default rows
             if (method_exists($this->filter, 'setRows')) {
                 $this->filter->setRows(0, 1);
             }
             // Set the read filter
             $this->reader->setReadFilter($this->filter);
         }
     }
     return $this;
 }