Services/Search/classes/class.ilUserSearchCache.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 ilUserSearchCache
{
        const DEFAULT_SEARCH = 0;
        const ADVANCED_SEARCH = 1;
        const ADVANCED_MD_SEARCH = 4;

        private static $instance = null;
        private $db;
        
        private $usr_id;
        private $search_type = self::DEFAULT_SEARCH;
        
        private $search_result = array();
        private $checked = array();
        private $failed = array();
        private $page_number = 1;
        
        
        private function __construct($a_usr_id)
        {
                global $ilDB;
                
                $this->db = $ilDB;
                $this->usr_id = $a_usr_id;
                $this->search_type = self::DEFAULT_SEARCH;
                $this->read();
        }
        
        public static function _getInstance($a_usr_id)
        {
                if(is_object(self::$instance) and self::$instance)
                {
                        return self::$instance;
                }
                return self::$instance = new ilUserSearchCache($a_usr_id);
        }
        
        public function switchSearchType($a_type)
        {
                $this->search_type = $a_type;
                $this->read();
                return true;
        }
        
        public function getResults()
        {
                return $this->search_result ? $this->search_result : array();           
        }
        
        public function setResults($a_results)
        {
                $this->search_result = $a_results;
        }
        
        public function addResult($a_result_item)
        {
                $this->search_result[$a_result_item['ref_id']]['ref_id'] = $a_result_item['ref_id'];
                $this->search_result[$a_result_item['ref_id']]['obj_id'] = $a_result_item['obj_id'];
                $this->search_result[$a_result_item['ref_id']]['type'] = $a_result_item['type'];
                return true;
        }

        public function appendToFailed($a_ref_id)
        {
                $this->failed[$a_ref_id] = $a_ref_id;
        }
        
        public function isFailed($a_ref_id)
        {
                return in_array($a_ref_id,$this->failed) ? true : false;
        }
        
        public function appendToChecked($a_ref_id,$a_obj_id)
        {
                $this->checked[$a_ref_id] = $a_obj_id;
        }
        
        public function isChecked($a_ref_id)
        {
                return array_key_exists($a_ref_id,$this->checked) and $this->checked[$a_ref_id];
        }
        
        public function getCheckedItems()
        {
                return $this->checked ? $this->checked : array();
        }
        
        public function setResultPageNumber($a_number)
        {
                if($a_number)
                {
                        $this->page_number = $a_number;
                }
        }
        
        public function getResultPageNumber()
        {
                return $this->page_number ? $this->page_number : 1; 
        }
        
        public function delete()
        {
                $query = "DELETE FROM usr_search ".
                        "WHERE usr_id = ".$this->db->quote($this->usr_id)." ".
                        "AND search_type = ".$this->db->quote($this->search_type);
                        
                $res = $this->db->query($query);
                $this->read();
                return true;
        }
        
        public function save()
        {
                if($this->usr_id == ANONYMOUS_USER_ID)
                {
                        return false;
                }

                $query = "DELETE FROM usr_search ".
                        "WHERE usr_id = ".$this->db->quote($this->usr_id)." ".
                        "AND search_type = ".$this->db->quote($this->search_type);
                $res = $this->db->query($query);

                $query = "INSERT INTO usr_search ".
                        "SET usr_id = ".$this->db->quote($this->usr_id).", ".
                        "search_result = '".addslashes(serialize($this->search_result))."', ".
                        "checked = '".addslashes(serialize($this->checked))."', ".
                        "failed = '".addslashes(serialize($this->failed))."', ".
                        "page = ".$this->db->quote($this->page_number).", ".
                        "search_type = ".$this->db->quote($this->search_type);
                $res = $this->db->query($query);
        }
        
        
        private function read()
        {
                $this->failed = array();
                $this->checked = array();
                $this->search_result = array();
                $this->page_number = 0;

                if($this->usr_id == ANONYMOUS_USER_ID)
                {
                        return false;
                }

                $query = "SELECT * FROM usr_search ".
                        "WHERE usr_id = ".$this->db->quote($this->usr_id)." ".
                        "AND search_type = ".$this->db->quote($this->search_type);
                
                $res = $this->db->query($query);
                while($row = $res->fetchRow(DB_FETCHMODE_OBJECT))
                {
                        $this->search_result = unserialize(stripslashes($row->search_result));
                        if(strlen($row->checked))
                        {
                                $this->checked = unserialize(stripslashes($row->checked));
                        }
                        if(strlen($row->failed))
                        {       
                                $this->failed = unserialize(stripslashes($row->failed));
                        }
                        $this->page_number = $row->page;
                }
                return true;                    
        }
}


?>