class.ilSetting.php

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<?php
/*
        +-----------------------------------------------------------------------------+
        | ILIAS open source                                                           |
        +-----------------------------------------------------------------------------+
        | Copyright (c) 1998-2006 ILIAS open source, University of Cologne            |
        |                                                                             |
        | This program is free software; you can redistribute it and/or               |
        | modify it under the terms of the GNU General Public License                 |
        | as published by the Free Software Foundation; either version 2              |
        | of the License, or (at your option) any later version.                      |
        |                                                                             |
        | This program is distributed in the hope that it will be useful,             |
        | but WITHOUT ANY WARRANTY; without even the implied warranty of              |
        | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the               |
        | GNU General Public License for more details.                                |
        |                                                                             |
        | You should have received a copy of the GNU General Public License           |
        | along with this program; if not, write to the Free Software                 |
        | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA. |
        +-----------------------------------------------------------------------------+
*/


class ilSetting
{
        private static $settings_cache = array();

        private static $value_type = NULL;


        var $setting = array();
        var $module = "";
        
        function ilSetting($a_module = "common", $a_disabled_cache = false)
        {
                global $ilDB;
                
                $this->cache_disabled = $a_disabled_cache;
                $this->module = $a_module;
                // check whether ini file object exists
                if (!is_object($ilDB))
                {
                        die ("Fatal Error: ilSettings object instantiated without DB initialisation.");
                }
                $this->read();
        }
                
        function read()
        {
                global $ilDB;
                
                // get the settings from the cache if they exist.
                // The setting array of the class is a reference to the cache.
                // So changing settings in one instance will change them in all.
                // This is the same behaviour as if the are read from the DB.
                if (!$this->cache_disabled)
                {
                        if (isset(self::$settings_cache[$this->module]))
                        {
                                $this->setting =& self::$settings_cache[$this->module];
                                return;
                        }
                        else
                        {
                                $this->setting = array();
                                self::$settings_cache[$this->module] =& $this->setting;
                        }
                }

                $query = "SELECT * FROM settings WHERE module=".$ilDB->quote($this->module, "text");
                $res = $ilDB->query($query);

                while ($row = $ilDB->fetchAssoc($res))
                {
                        $this->setting[$row["keyword"]] = $row["value"];
                }

        }
        
        function get($a_keyword, $a_default_value = false)
        {
                if ($a_keyword == "ilias_version")
                {
                        return ILIAS_VERSION;
                }
                
                if (isset($this->setting[$a_keyword]))
                {
                        return $this->setting[$a_keyword];
                }
                else
                {
                        return $a_default_value;
                }
        }
        
        public function deleteAll()
        {
                global $ilDB;
                
                $query = "DELETE FROM settings WHERE module = ".$ilDB->quote($this->module, "text");
                $ilDB->manipulate($query);

                $this->setting = array();

                return true;
        }
        
        public function deleteLike($a_like)
        {
                global $ilDB;

                $query = "SELECT keyword FROM settings".
                        " WHERE module = ".$ilDB->quote($this->module, "text").
                        " AND ".$ilDB->like("keyword", "text", $a_like);
                $res = $ilDB->query($query);
                while($row = $ilDB->fetchAssoc($res))
                {
                        $this->delete($row["keyword"]);
                }
                
                return true;
        }

        function delete($a_keyword)
        {
                global $ilDB;

                $st = $ilDB->manipulate("DELETE FROM settings WHERE keyword = ".
                        $ilDB->quote($a_keyword, "text")." AND module = ".
                        $ilDB->quote($this->module, "text"));

                unset($this->setting[$a_keyword]);

                return true;
        }
        
        

        function getAll()
        {
                return $this->setting;
        }

        function set($a_key, $a_val)
        {
                global $lng, $ilDB;
                
                $this->delete($a_key);

                if (!isset(self::$value_type))
                {
                self::$value_type = self::_getValueType();
            }

                if (self::$value_type == 'text' and strlen($a_val) >= 4000)
                {
                        ilUtil::sendFailure($lng->txt('setting_value_truncated'), true);
                        $a_val = substr($a_val, 0, 4000);
                }

                $ilDB->insert("settings", array(
                        "module" => array("text", $this->module),
                        "keyword" => array("text", $a_key),
                        "value" => array(self::$value_type, $a_val)));

                $this->setting[$a_key] = $a_val;

                return true;
        }
        
        function setScormDebug($a_key, $a_val)
        {
                global $ilDB;
                if ($a_val != "1") {
                        $ilDB->query("UPDATE sahs_lm SET debug = 'n'");
                }
                $setreturn = ilSetting::set($a_key, $a_val);
                return $setreturn;
        }
        
        public static function _lookupValue($a_module, $a_keyword)
        {
                global $ilDB;
                
                $query = "SELECT value FROM settings WHERE module = %s AND keyword = %s";
                $res = $ilDB->queryF($query, array('text', 'text'), array($a_module, $a_keyword));
                $data = $ilDB->fetchAssoc($res);
                return $data['value'];
        }

        public static function _getValueType()
        {
                include_once ('./Services/Database/classes/class.ilDBAnalyzer.php');
                $analyzer = new ilDBAnalyzer;
                $info = $analyzer->getFieldInformation('settings');

                if ($info['value']['type'] == 'clob')
                {
                return 'clob';
            }
                else
                {
                return 'text';
            }
        }


    public static function _changeValueType($a_new_type = 'text')
        {
            global $ilDB;

            $old_type = self::_getValueType();

                if ($a_new_type == $old_type)
                {
                return false;
            }
                elseif ($a_new_type == 'clob')
                {
                $ilDB->addTableColumn('settings','value2',
                                                        array(  "type" => "clob",
                                                                        "notnull" => false,
                                                                        "default" => NULL));

                        $ilDB->query("UPDATE settings SET value2 = value");
                        $ilDB->dropTableColumn('settings','value');
                        $ilDB->renameTableColumn('settings','value2','value');

                        return true;
            }
                elseif ($a_new_type == 'text')
                {
                        $ilDB->addTableColumn('settings','value2',
                                                        array(  "type" => "text",
                                                                        "length" => 4000,
                                                                        "notnull" => false,
                                                                        "default" => NULL));

                        $ilDB->query("UPDATE settings SET value2 = value");
                        $ilDB->dropTableColumn('settings','value');
                        $ilDB->renameTableColumn('settings','value2','value');

                        return true;
                }
                else
                {
                return false;
            }
        }


    public static function _getLongerSettings($a_limit = '4000')
        {
            global $ilDB;

                $settings = array();

                $query = "SELECT * FROM settings WHERE LENGTH(value) > "
                        . $ilDB->quote($a_limit, 'integer');

                $result = $ilDB->query($query);

                while ($row = $ilDB->fetchAssoc($result))
                {
                $settings[] = $row;
            }

                return $settings;
        }
}
?>