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* @license GNU General Public License version 2 or later; see LICENSE.txt */ namespace Joomla\CMS\Tree; \defined('JPATH_PLATFORM') or die; /** * Defines the trait for a Node Interface Trait Class. * * @since 4.0.0 */ trait NodeTrait { use ImmutableNodeTrait; /** * Set the parent of this node * * If the node already has a parent, the link is unset * * @param NodeInterface|null $parent NodeInterface for the parent to be set or null * * @return void * * @since 4.0.0 */ public function setParent(NodeInterface $parent) { if (!\is_null($this->_parent)) { $key = array_search($this, $this->_parent->_children); unset($this->_parent->_children[$key]); } $this->_parent = $parent; $this->_parent->_children[] = &$this; if (\count($this->_parent->_children) > 1) { end($this->_parent->_children); $this->_leftSibling = prev($this->_parent->_children); $this->_leftSibling->_rightSibling = $this; } } /** * Add child to this node * * If the child already has a parent, the link is unset * * @param NodeInterface $child The child to be added. * * @return void * * @since 4.0.0 */ public function addChild(NodeInterface $child) { $child->setParent($this); } /** * Remove a specific child * * @param NodeInterface $child Child to remove * * @return void * * @since 4.0.0 */ public function removeChild(NodeInterface $child) { $key = array_search($child, $this->_children); unset($this->_children[$key]); } /** * Function to set the left or right sibling of a node * * @param NodeInterface $sibling NodeInterface object for the sibling * @param boolean $right If set to false, the sibling is the left one * * @return void * * @since 4.0.0 */ public function setSibling(NodeInterface $sibling, $right = true) { if ($right) { $this->_rightSibling = $sibling; } else { $this->_leftSibling = $sibling; } } }