/**
* Add value
*
* @param string $key
* @param $value
* @return mixed
*/
public function add(string $key, $value)
{
$item = $this->itemFactory->create($key, $value);
$node = $this->nodeFactory->create($item);
$this->length++;
if (!$this->first) {
$this->first = $node;
$this->current = $node;
$this->last = $node;
} else {
$this->last->setRight($node);
$node->setLeft($this->last);
$this->last = $node;
}
}
/**
* @param string $key
* @return int
*/
private function createIndex(string $key) : int
{
return $this->itemFactory->create($key, null)->getHashCode();
}