class.ilMetaDataSearch.php

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<?php
/*
        +-----------------------------------------------------------------------------+
        | ILIAS open source                                                           |
        +-----------------------------------------------------------------------------+
        | Copyright (c) 1998-2001 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. |
        +-----------------------------------------------------------------------------+
*/

include_once 'Services/Search/classes/class.ilAbstractSearch.php';

class ilMetaDataSearch extends ilAbstractSearch
{
        var $mode = '';

        /*
         * instance of query parser
         */
        var $query_parser = null;

        var $db = null;

        function setMode($a_mode)
        {
                $this->mode = $a_mode;
        }
        function getMode()
        {
                return $this->mode;
        }


        function &performSearch()
        {
                switch($this->getMode())
                {
                        case 'keyword':
                                return $this->__searchKeywords();

                        case 'contribute':
                                return $this->__searchContribute();

                        case 'title':
                                return $this->__searchTitles();

                        case 'description':
                                return $this->__searchDescriptions();

                        default:
                                echo "ilMDSearch::performSearch() no mode given";
                                return false;
                }
        }



        // Private
        function __createInStatement()
        {
                if(!$this->getFilter())
                {
                        return '';
                }
                else
                {
                        $type = "('";
                        $type .= implode("','",$this->getFilter());
                        $type .= "')";
                        
                        $in = " AND obj_type IN ".$type;

                        return $in;
                }
        }
        function __searchContribute()
        {
                $this->setFields(array('entity'));

                $in = $this->__createInStatement();
                $where = $this->__createContributeWhereCondition();
                $locate = $this->__createLocateString();

                $query = "SELECT rbac_id,obj_id,obj_type ".
                        $locate.
                        "FROM il_meta_entity ".
                        $where." ".$in.' ';

                $res = $this->db->query($query);
                while($row = $res->fetchRow(ilDBConstants::FETCHMODE_OBJECT))
                {
                        $this->search_result->addEntry($row->rbac_id,$row->obj_type,$this->__prepareFound($row),$row->obj_id);
                }

                return $this->search_result;
        }               


        function __searchKeywords()
        {
                $this->setFields(array('keyword'));

                $in = $this->__createInStatement();
                $where = $this->__createKeywordWhereCondition();
                $locate = $this->__createLocateString();

                $query = "SELECT rbac_id,obj_id,obj_type ".
                        $locate.
                        "FROM il_meta_keyword ".
                        $where." ".$in.' ';

                $res = $this->db->query($query);
                while($row = $res->fetchRow(ilDBConstants::FETCHMODE_OBJECT))
                {
                        $this->search_result->addEntry($row->rbac_id,$row->obj_type,$this->__prepareFound($row),$row->obj_id);
                }

                return $this->search_result;
        }               
        function __searchTitles()
        {
                $this->setFields(array('title'));

                $in = $this->__createInStatement();
                $where = $this->__createTitleWhereCondition();
                $locate = $this->__createLocateString();

                $query = "SELECT rbac_id,obj_id,obj_type ".
                        $locate.
                        "FROM il_meta_general ".
                        $where." ".$in.' ';

                $res = $this->db->query($query);
                while($row = $res->fetchRow(ilDBConstants::FETCHMODE_OBJECT))
                {
                        $this->search_result->addEntry($row->rbac_id,$row->obj_type,$this->__prepareFound($row),$row->obj_id);
                }

                return $this->search_result;
        }               
        function __searchDescriptions()
        {
                $this->setFields(array('description'));

                $in = $this->__createInStatement();
                $where = $this->__createDescriptionWhereCondition();
                $locate = $this->__createLocateString();

                $query = "SELECT rbac_id,obj_id,obj_type ".
                        $locate.
                        "FROM il_meta_description ".
                        $where." ".$in.' ';

                $res = $this->db->query($query);
                while($row = $res->fetchRow(ilDBConstants::FETCHMODE_OBJECT))
                {
                        $this->search_result->addEntry($row->rbac_id,$row->obj_type,$this->__prepareFound($row),$row->obj_id);
                }

                return $this->search_result;
        }               
}
?>