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<?php
/**
* CakePHP(tm) : Rapid Development Framework (https://cakephp.org)
* Copyright (c) Cake Software Foundation, Inc. (https://cakefoundation.org)
*
* Licensed under The MIT License
* For full copyright and license information, please see the LICENSE.txt
* Redistributions of files must retain the above copyright notice.
*
* @copyright Copyright (c) Cake Software Foundation, Inc. (https://cakefoundation.org)
* @link https://cakephp.org CakePHP(tm) Project
* @since 3.0.0
* @license https://opensource.org/licenses/mit-license.php MIT License
*/
namespace Cake\Collection\Iterator;
use Cake\Collection\Collection;
use RecursiveIterator;
use Traversable;
/**
* A type of collection that is aware of nested items and exposes methods to
* check or retrieve them
*/
class NestIterator extends Collection implements RecursiveIterator
{
/**
* The name of the property that contains the nested items for each element
*
* @var string|callable
*/
protected $_nestKey;
/**
* Constructor
*
* @param array|\Traversable $items Collection items.
* @param string|callable $nestKey the property that contains the nested items
* If a callable is passed, it should return the childrens for the passed item
*/
public function __construct($items, $nestKey)
{
parent::__construct($items);
$this->_nestKey = $nestKey;
}
/**
* Returns a traversable containing the children for the current item
*
* @return \Traversable
*/
public function getChildren()
{
$property = $this->_propertyExtractor($this->_nestKey);
return new static($property($this->current()), $this->_nestKey);
}
/**
* Returns true if there is an array or a traversable object stored under the
* configured nestKey for the current item
*
* @return bool
*/
public function hasChildren()
{
$property = $this->_propertyExtractor($this->_nestKey);
$children = $property($this->current());
if (is_array($children)) {
return !empty($children);
}
return $children instanceof Traversable;
}
}