<?php

/*
 * SITE : Classes & PHP
 * TITRE : PHP4 - Design pattern composite
 * AUTEUR : Antoine DESSAIGNE
 *
 */

header('Content-Type: text/plain');

Class Component
{
	var $name;
	var $parent;
	var $children;

	function Component($name)
	{
		$this->__uniqid = uniqid(rand(), true);
		$this->name = $name;
		$this->parent = null;
		$this->children = array();
	}

	function addChild(&$child)
	{
		if (!is_object($child) || !is_a($child, 'Component'))
			return false;

		if ($child->parent != null)
			$child->parent->removeChild($child);

		$this->children[] =& $child;

		return true;
	}

	function removeChild(&$child)
	{
		if (!is_object($child) || !is_a($child, 'Component'))
			return false;

		for ($i = 0; $i < count($this->children); $i++)
		{
			if (isset($this->children[$i]) && $this->children[i] === $child)
			{
				unset($this->children[$i]);
				$this->children[$i]->parent = null;
				return true;
			}
		}

		return false;
	}

	function display($depth = 0)
	{
		echo str_repeat('-', $depth).$this->name."\n";

		foreach($this->children as $el)
			$el->display($depth +2);
	}
}

$node = new Component('node');
$node1 = new Component('node1');
$node11 = new Component('node11');
$node12 = new Component('node12');
$node121 = new Component('node121');
$node122 = new Component('node122');
$node13 = new Component('node13');
$node2 = new Component('node2');
$node3 = new Component('node3');
$node31 = new Component('node31');
$node32 = new Component('node32');

$node->addChild($node1);
$node1->addChild($node11);
$node1->addChild($node12);
$node12->addChild($node121);
$node12->addChild($node122);
$node1->addChild($node13);
$node->addChild($node2);
$node->addChild($node3);
$node3->addChild($node31);
$node3->addChild($node32);

$node->display(1);

?>