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Filename : ImmutableNodeTrait.php
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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('JPATH_PLATFORM') or die;
// phpcs:enable PSR1.Files.SideEffects

/**
 * Defines the trait for an Immutable Node Class.
 *
 * @since  4.0.0
 */
trait ImmutableNodeTrait
{
    /**
     * Parent node object
     *
     * @var    NodeInterface
     * @since  1.6
     */
    protected $_parent = null;

    /**
     * Array of Children
     *
     * @var    NodeInterface[]
     * @since  1.6
     */
    protected $_children = [];

    /**
     * Node left of this one
     *
     * @var    NodeInterface
     * @since  1.6
     */
    protected $_leftSibling = null;

    /**
     * Node right of this one
     *
     * @var    NodeInterface
     * @since  1.6
     */
    protected $_rightSibling = null;

    /**
     * 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)
    {
        if ($recursive) {
            $items = [];

            foreach ($this->_children as $child) {
                $items[] = $child;
                $items   = array_merge($items, $child->getChildren(true));
            }

            return $items;
        }

        return $this->_children;
    }

    /**
     * Get the parent of this node
     *
     * @return  NodeInterface|null
     *
     * @since   4.0.0
     */
    public function getParent()
    {
        return $this->_parent;
    }

    /**
     * Get the root of the tree
     *
     * @return  ImmutableNodeInterface
     *
     * @since   4.0.0
     */
    public function getRoot()
    {
        $root = $this->getParent();

        if (!$root) {
            return $this;
        }

        while ($root->hasParent()) {
            $root = $root->getParent();
        }

        return $root;
    }

    /**
     * Test if this node has children
     *
     * @return  boolean  True if there is a child
     *
     * @since   4.0.0
     */
    public function hasChildren()
    {
        return (bool) \count($this->_children);
    }

    /**
     * Test if this node has a parent
     *
     * @return  boolean  True if there is a parent
     *
     * @since   4.0.0
     */
    public function hasParent()
    {
        return $this->getParent() != null;
    }

    /**
     * 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)
    {
        if ($right) {
            return $this->_rightSibling;
        } else {
            return $this->_leftSibling;
        }
    }
}