<?
class DB_Object_Collection implements Iterator {
	/*
		Tableau des valeurs id => object
	*/
	public $items = array();
	/*
		Classe des objets de la collection 
	*/
	public $class;
	/*
		$CACHE = true : l'objet est instancié une fois et conserver
						mémoire
		$CACHE = false : l'objet est instancié à la demande à chaque 
						parcours du tableau 
	*/
	public static $CACHE = true;
	
	public function __construct($class, $values = null) {
		$this->class = $class;
		if (is_array($values)) {
			foreach ($values as $k => $v) {
				$this->add((int) $v);
			}
		}
	}
	public function rewind() {
		reset($this->items);
	}
	public function current() {
		$var = current($this->items);
		
		if (!is_object($var) && $var !== false) {
			if (self::$CACHE) {
				$this->items[$this->key()] = Object_Factory::Build($this->class, $this->key());
				$var = current($this->items);
			} else {
				$var = Object_Factory::Build($this->class, $this->key());
			}
		}
		return $var;
	}
	public function key() {
		$var = key($this->items);
		return $var;
	}
	public function next() {
		$var = next($this->items);
		if (!is_object($var) && $var !== false) {
			if (self::$CACHE) {
				$this->items[$this->key()] = Object_Factory::Build($this->class, $this->key());
				$var = $this->items[$this->key()];
			} else {
				$var = Object_Factory::Build($this->class, $this->key());
			}
		}
		return $var;
	}
	public function valid() {
		$var = $this->current() !== false;
		return $var;
	}
	public function add($Object) {
		if (is_object($Object)) {
			if (is_subclass_of($Object, 'DB_Object')) {
				$this->items[$Object->Id] = $Object;
			} else if(get_class($Object) == 'DB_Object_Collection' && $this->class == $Object->class) {
				$this->add($Object->get_keys());
			}
		} else if ((int) $Object > 0) {
			$this->items[(int) $Object] = null;
		} else if (is_array($Object)) {
			foreach ($Object as $k => $v) {
				$this->items[(int) $k] = null;
			}
		}
	}
	public function get_keys() {
		return array_keys($this->items);
	}
	public function key_exists($k) {
		if (is_object($k)) {
			$k = (int) $k->Id;
		}
		return array_key_exists((int) $k, $this->items);
	}
	public function delete($k) {
		if (is_object($k)) {
			$k = intval($k->Id);
		}
		unset($this->items[(int) $k]);
	}
	public function size() {
		return sizeof($this->items);
	}
}

?>