is_available() public method

Is this method available?
public is_available ( array $package ) : boolean
$package array
return boolean
 /**
  * Is this method available?
  *
  * @version 2.5.7
  * @since   2.5.7
  * @param   array $package
  * @return  bool
  */
 public function is_available($package)
 {
     $available = parent::is_available($package);
     if ($available) {
         $total_weight = WC()->cart->get_cart_contents_weight();
         if (0 != $this->min_weight && $total_weight < $this->min_weight) {
             $available = false;
         } elseif (0 != $this->max_weight && $total_weight > $this->max_weight) {
             $available = false;
         }
     }
     return $available;
 }