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<?php
/* Icinga Web 2 | (c) 2015 Icinga Development Team | GPLv2+ */
namespace Icinga\Data\Tree;
use IteratorAggregate;
use LogicException;
use Traversable;
/**
* A simple tree
*/
class SimpleTree implements IteratorAggregate
{
/**
* Root node
*
* @var TreeNode
*/
protected $sentinel;
/**
* Nodes
*
* @var array
*/
protected $nodes = array();
/**
* Create a new simple tree
*/
public function __construct()
{
$this->sentinel = new TreeNode();
}
/**
* 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;
}
/**
* Get a node by its ID
*
* @param mixed $id
*
* @return TreeNode|null
*/
public function getNode($id)
{
if (! isset($this->nodes[$id])) {
return null;
}
return $this->nodes[$id];
}
/**
* @return TreeNodeIterator
*/
public function getIterator(): Traversable
{
return new TreeNodeIterator($this->sentinel);
}
}
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