Node.php

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<?php
namespace Magento\Framework\Data\Tree;

use Magento\Framework\Data\Tree;
use Magento\Framework\Data\Tree\Node\Collection;

class Node extends \Magento\Framework\DataObject
{
    protected $_parent;

    protected $_tree;

    protected $_childNodes;

    protected $_idField;

    public function __construct($data, $idField, $tree, $parent = null)
    {
        $this->setTree($tree);
        $this->setParent($parent);
        $this->setIdField($idField);
        $this->setData($data);
        $this->_childNodes = new Collection($this);
    }

    public function getId()
    {
        return $this->getData($this->getIdField());
    }

    public function setIdField($idField)
    {
        $this->_idField = $idField;
        return $this;
    }

    public function getIdField()
    {
        return $this->_idField;
    }

    public function setTree(Tree $tree)
    {
        $this->_tree = $tree;
        return $this;
    }

    public function getTree()
    {
        return $this->_tree;
    }

    public function setParent($parent)
    {
        $this->_parent = $parent;
        return $this;
    }

    public function getParent()
    {
        return $this->_parent;
    }

    public function hasChildren()
    {
        return $this->_childNodes->count() > 0;
    }

    public function setLevel($level)
    {
        $this->setData('level', $level);
        return $this;
    }

    public function setPathId($path)
    {
        $this->setData('path_id', $path);
        return $this;
    }

    public function isChildOf($node)
    {
    }

    public function loadChildren($recursionLevel = 0)
    {
        $this->_tree->load($this, $recursionLevel);
        return $this;
    }

    public function getChildren()
    {
        return $this->_childNodes;
    }

    public function getAllChildNodes(&$nodes = [])
    {
        foreach ($this->_childNodes as $node) {
            $nodes[$node->getId()] = $node;
            $node->getAllChildNodes($nodes);
        }
        return $nodes;
    }

    public function getLastChild()
    {
        return $this->_childNodes->lastNode();
    }

    public function addChild($node)
    {
        $this->_childNodes->add($node);
        return $this;
    }

    public function appendChild($prevNode = null)
    {
        $this->_tree->appendChild($this, $prevNode);
        return $this;
    }

    public function moveTo($parentNode, $prevNode = null)
    {
        $this->_tree->moveNodeTo($this, $parentNode, $prevNode);
        return $this;
    }

    public function copyTo($parentNode, $prevNode = null)
    {
        $this->_tree->copyNodeTo($this, $parentNode, $prevNode);
        return $this;
    }

    public function removeChild($childNode)
    {
        $this->_childNodes->delete($childNode);
        return $this;
    }

    public function getPath(&$prevNodes = [])
    {
        if ($this->_parent) {
            $prevNodes[] = $this;
            $this->_parent->getPath($prevNodes);
        }
        return $prevNodes;
    }

    public function getIsActive()
    {
        return $this->_getData('is_active');
    }

    public function getName()
    {
        return $this->_getData('name');
    }
}