/**
* Destroys the data field
*/
function __destruct()
{
$this->tag = null;
parent::__destruct();
}
/**
* Destroys the subfield
*/
function __destruct()
{
$this->code = null;
$this->data = null;
parent::__destruct();
}
/**
* Deletes a {@link Structures_LinkedList_DoubleNode} from the list.
*
* @param Structures_LinkedList_DoubleNode $node Node to delete.
*
* @return null
*/
public function deleteNode($node)
{
/* If this is the root node, and there are more nodes in the list,
* make the next node the new root node before deleting this node.
*/
if ($node === $this->root_node) {
$this->root_node = $node->next();
}
/* If this is the tail node, and there are more nodes in the list,
* make the previous node the tail node before deleting this node
*/
if ($node === $this->tail_node) {
$this->tail_node = $node->previous();
}
/* If this is the current node, and there are other nodes in the list,
* try making the previous node the current node so that next() works
* as expected.
*
* If that fails, make the next node the current node.
*
* If that fails, null isn't such a bad place to be.
*/
if ($node === $this->current) {
if ($node->previous()) {
$this->current = $node->previous();
} elseif ($node->next()) {
$this->current = $node->next();
} else {
$this->current = null;
}
}
$node->__destruct();
}
