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<?php
/**
* Copyright (c) 2013-2020 Nicolò Martini
*
* For the full copyright and license information, please view
* the LICENSE.md file that was distributed with this source code.
*
* @see https://github.com/nicmart/Tree
*/
namespace Tree\Node;
use Tree\Visitor\Visitor;
/**
* Interface for tree nodes.
*
* @author Nicolò Martini <nicmartnic@gmail.com>
*/
interface NodeInterface
{
/**
* Set the value of the current node.
*
* @param mixed $value
*
* @return NodeInterface the current instance
*/
public function setValue($value);
/**
* Get the current node value.
*
* @return mixed
*/
public function getValue();
/**
* Add a child.
*
* @param NodeInterface $child
*
* @return mixed
*/
public function addChild(self $child);
/**
* Remove a node from children.
*
* @param NodeInterface $child
*
* @return NodeInterface the current instance
*/
public function removeChild(self $child);
/**
* Remove all children.
*
* @return NodeInterface The current instance
*/
public function removeAllChildren();
/**
* Return the array of children.
*
* @return NodeInterface[]
*/
public function getChildren();
/**
* Replace the children set with the given one.
*
* @param NodeInterface[] $children
*
* @return mixed
*/
public function setChildren(array $children);
/**
* Set the parent node.
*
* @param NodeInterface $parent
*/
public function setParent(?self $parent = null);
/**
* Return the parent node.
*
* @return NodeInterface
*/
public function getParent();
/**
* Retrieves all ancestors of node excluding current node.
*
* @return array
*/
public function getAncestors();
/**
* Retrieves all ancestors of node as well as the node itself.
*
* @return Node[]
*/
public function getAncestorsAndSelf();
/**
* Retrieves all neighboring nodes, excluding the current node.
*
* @return array
*/
public function getNeighbors();
/**
* Returns all neighboring nodes, including the current node.
*
* @return Node[]
*/
public function getNeighborsAndSelf();
/**
* Return true if the node is the root, false otherwise.
*
* @return bool
*/
public function isRoot();
/**
* Return true if the node is a child, false otherwise.
*
* @return bool
*/
public function isChild();
/**
* Return true if the node has no children, false otherwise.
*
* @return bool
*/
public function isLeaf();
/**
* Return the distance from the current node to the root.
*
* @return int
*/
public function getDepth();
/**
* Return the height of the tree whose root is this node.
*
* @return int
*/
public function getHeight();
/**
* Accept method for the visitor pattern (see http://en.wikipedia.org/wiki/Visitor_pattern).
*
* @param Visitor $visitor
*/
public function accept(Visitor $visitor);
}
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