class.ilBitmask.php

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<?php
/* Copyright (c) 1998-2013 ILIAS open source, Extended GPL, see docs/LICENSE */

class ilBitmask
{
        protected $setting_names;

        protected $bitmask;

        public function __construct($a_setting_names, $a_bitmask)
        {
                $this->setting_names    = $a_setting_names;
                $this->bitmask          = $a_bitmask;
                return;
        }

        public function get($a_setting_name)
        {
                $i = 1;
                foreach($this->setting_names as $name)
                {
                        if ($name == $a_setting_name)
                        {
                                $retval = (($this->bitmask & $i) > 0);
                                return $retval;
                        }
                        $i = $i * 2;
                }
                require_once './Services/Exceptions/classes/class.ilException.php';
                throw new ilException ('No such setting on bitmask.');
        }

        public function set($a_setting_name, $value)
        {
                if (!in_array($a_setting_name, $this->setting_names))
                {
                        require_once './Services/Exceptions/classes/class.ilException.php';
                        throw new ilException ('No such setting on bitmask.');
                }

                $current_value = $this->get($a_setting_name);
                if ($current_value == $value)
                {

                        return;
                }

                $i = 1;
                foreach($this->setting_names as $name)
                {
                        if ($name == $a_setting_name)
                        {
                                if ($value == true)
                                {
                                        $this->bitmask = $this->bitmask | $i;
                                }
                                else
                                {
                                        $this->bitmask = $this->bitmask ^ $i;
                                }
                        }
                        $i = $i * 2;
                }
                return;
        }

        public function  getBitmask()
        {
                return $this->bitmask;
        }
}