Tree.php

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<?php
namespace Magento\Framework\Data;

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

class Tree
{
    protected $_nodes;

    public function __construct()
    {
        $this->_nodes = new NodeCollection($this);
    }

    public function getTree()
    {
        return $this;
    }

    public function load($parentNode = null)
    {
    }

    public function loadNode($nodeId)
    {
    }

    public function appendChild($data, $parentNode, $prevNode = null)
    {
        if (is_array($data)) {
            $node = $this->addNode(new Node($data, $parentNode->getIdField(), $this), $parentNode);
        } elseif ($data instanceof Node) {
            $node = $this->addNode($data, $parentNode);
        }
        return $node;
    }

    public function addNode($node, $parent = null)
    {
        $this->_nodes->add($node);
        $node->setParent($parent);
        if ($parent !== null && $parent instanceof Node) {
            $parent->addChild($node);
        }
        return $node;
    }

    public function moveNodeTo($node, $parentNode, $prevNode = null)
    {
    }

    public function copyNodeTo($node, $parentNode, $prevNode = null)
    {
    }

    public function removeNode($node)
    {
        $this->_nodes->delete($node);
        if ($node->getParent()) {
            $node->getParent()->removeChild($node);
        }
        unset($node);
        return $this;
    }

    public function createNode($parentNode, $prevNode = null)
    {
    }

    public function getChild($node)
    {
    }

    public function getChildren($node)
    {
    }

    public function getNodes()
    {
        return $this->_nodes;
    }

    public function getNodeById($nodeId)
    {
        return $this->_nodes->searchById($nodeId);
    }

    public function getPath($node)
    {
        if ($node instanceof Node) {
        } elseif (is_numeric($node)) {
            if ($_node = $this->getNodeById($node)) {
                return $_node->getPath();
            }
        }
        return [];
    }
}