/**
* get instance for page with ID $page_id
*
* @access public
* @param integer $page_id
* @return object
**/
public static function getInstance($page_id)
{
if (!is_numeric($page_id)) {
self::printFatalError('Invalid page ID!');
}
if (!self::$helper) {
self::$helper = CAT_Helper_Page::getInstance();
}
if ($page_id == -1 || !isset(self::$instances[$page_id])) {
if ($page_id == -1) {
$page_id = self::$helper->selectPage();
}
self::$instances[$page_id] = new self($page_id);
self::init($page_id);
}
return self::$instances[$page_id];
}
