/**
* Add a child node
*
* @param TreeNode $child
* @param TreeNode $parent
*
* @return $this
*/
public function addChild(TreeNode $child, TreeNode $parent = null)
{
if ($parent === null) {
$parent = $this->sentinel;
} elseif (!isset($this->nodes[$parent->getId()])) {
throw new LogicException(sprintf('Can\'t append child node %s to parent node %s: Parent node does not exist', $child->getId(), $parent->getId()));
}
if (isset($this->nodes[$child->getId()])) {
throw new LogicException(sprintf('Can\'t append child node %s to parent node %s: Child node does already exist', $child->getId(), $parent->getId()));
}
$this->nodes[$child->getId()] = $child;
$parent->appendChild($child);
return $this;
}
/**
* Create a new iterator over a tree node's children
*
* @param TreeNode $node
*/
public function __construct(TreeNode $node)
{
$this->children = new ArrayIterator($node->getChildren());
}
/**
* {@inheritdoc}
*/
public function setId($id)
{
return parent::setId(str_replace(' ', '-', (string) $id));
}
