class.ilUserClipboard.php

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<?php

/* Copyright (c) 1998-2010 ILIAS open source, Extended GPL, see docs/LICENSE */

class ilUserClipboard
{
        const SESSION_KEYWORD = 'usr_clipboard';
        
        private static $instance = null;
        
        private $user_id = 0;
        private $clipboard = array();
        
        
        protected function __construct($a_user_id)
        {
                $this->user_id = $a_user_id;
                $this->read();
        }
        
        public static function getInstance($a_usr_id)
        {
                if(!self::$instance)
                {
                        self::$instance = new self($a_usr_id);
                }
                return self::$instance;
        }
        
        public function hasContent()
        {
                return (bool) count($this->clipboard);
        }
        
        public function get()
        {
                return (array) $this->clipboard;
        }
        
        public function getValidatedContent()
        {
                $valid = array();
                foreach($this->clipboard as $usr_id)
                {
                        include_once './Services/User/classes/class.ilObjUser.php';
                        if(strlen(ilObjUser::_lookupLogin($usr_id)))
                        {
                                $valid[] = $usr_id;
                        }
                }
                return $valid;
        }
        
        public function add($a_usr_ids)
        {
                $this->clipboard = array_unique(array_merge($this->clipboard, (array) $a_usr_ids));
        }
        
        public function delete(array $a_usr_ids)
        {
                $remaining = array();
                foreach($this->get() as $usr_id)
                {
                        if(!in_array($usr_id, $a_usr_ids))
                        {
                                $remaining[] = $usr_id;
                        }
                }
                $this->replace($remaining);
        }
        
        public function replace(array $a_usr_ids)
        {
                $this->clipboard = $a_usr_ids;
        }
        
        public function clear()
        {
                $this->clipboard = array();
        }
        
        public function save()
        {
                ilSession::set(self::SESSION_KEYWORD, (array) $this->clipboard);
        }
        
        protected function read()
        {
                $this->clipboard = (array) ilSession::get(self::SESSION_KEYWORD);
        }
}
?>