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<?php
/**
* Joomla! Content Management System
*
* @copyright (C) 2019 Open Source Matters, Inc. <https://www.joomla.org>
* @license GNU General Public License version 2 or later; see LICENSE.txt
*/
namespace Joomla\CMS\Tree;
// phpcs:disable PSR1.Files.SideEffects
\defined('_JEXEC') or die;
// phpcs:enable PSR1.Files.SideEffects
/**
* Interface for an immutable node class
*
* @since 4.0.0
*/
interface ImmutableNodeInterface
{
/**
* Get the children of this node
*
* @param boolean $recursive False by default
*
* @return NodeInterface[] The children
*
* @since 4.0.0
*/
public function &getChildren($recursive = false);
/**
* Get the parent of this node
*
* @return NodeInterface|null
*
* @since 4.0.0
*/
public function getParent();
/**
* Get the root of the tree
*
* @return ImmutableNodeInterface
*
* @since 4.0.0
*/
public function getRoot();
/**
* Test if this node has children
*
* @return boolean True if there is a child
*
* @since 4.0.0
*/
public function hasChildren();
/**
* Test if this node has a parent
*
* @return boolean True if there is a parent
*
* @since 4.0.0
*/
public function hasParent();
/**
* Returns the right or left sibling of a node
*
* @param boolean $right If set to false, returns the left sibling
*
* @return NodeInterface|null NodeInterface object of the sibling.
*
* @since 4.0.0
*/
public function getSibling($right = true);
}