public function PriorityFilter(Capacity $capacity)
 {
     $color = '';
     if ($capacity->getPriority() / Capacity::PRIORITY_MAX_LEVEL > 0.66) {
         $color = 'green';
     } elseif ($capacity->getPriority() / Capacity::PRIORITY_MAX_LEVEL > 0.33) {
         $color = 'orange';
     } else {
         $color = 'red';
     }
     $html = '<div>';
     for ($level = 0; $level <= Capacity::PRIORITY_MAX_LEVEL; $level++) {
         if ($capacity->getPriority() >= $level) {
             $html .= '<i class="' . $color . ' square icon"></i>';
         } else {
             $html .= '<i class="' . $color . ' square outline icon"></i>';
         }
     }
     return $html . '</div>';
 }