content/classes/Pages/class.ilInternalLink.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. |
        +-----------------------------------------------------------------------------+
*/

class ilInternalLink
{
        function _deleteAllLinksOfSource($a_source_type, $a_source_id)
        {
                global $ilias;

                $q = "DELETE FROM int_link WHERE source_type='$a_source_type' AND source_id='$a_source_id'";
                $ilias->db->query($q);
        }

        function _saveLink($a_source_type, $a_source_id, $a_target_type, $a_target_id, $a_target_inst = 0)
        {
                global $ilias;

                $q = "REPLACE INTO int_link (source_type, source_id, target_type, target_id, target_inst) VALUES".
                        " ('$a_source_type', '$a_source_id', '$a_target_type', '$a_target_id', '$a_target_inst')";
                $ilias->db->query($q);
        }

        function _getSourcesOfTarget($a_target_type, $a_target_id, $a_target_inst)
        {
                global $ilias;

                $q = "SELECT * FROM int_link WHERE ".
                        "target_type = '$a_target_type' AND ".
                        "target_id = '$a_target_id' AND ".
                        "target_inst = '$a_target_inst'";
                $source_set = $ilias->db->query($q);
                $sources = array();
                while ($source_rec = $source_set->fetchRow(DB_FETCHMODE_ASSOC))
                {
                        $sources[$source_rec["source_type"].":".$source_rec["source_id"]] =
                                array("type" => $source_rec["source_type"], "id" => $source_rec["source_id"]);
                }

                return $sources;
        }

        function _getTargetsOfSource($a_source_type, $a_source_id)
        {
                global $ilDB;

                $q = "SELECT * FROM int_link WHERE ".
                        "source_type = ".$ilDB->quote($a_source_type)." AND ".
                        "source_id = ".$ilDB->quote($a_source_id);

                $target_set = $ilDB->query($q);
                $targets = array();
                while ($target_rec = $target_set->fetchRow(DB_FETCHMODE_ASSOC))
                {
                        $targets[$target_rec["target_type"].":".$target_rec["target_id"].":".$target_rec["target_inst"]] =
                                array("type" => $target_rec["target_type"], "id" => $target_rec["target_id"],
                                "inst" => $target_rec["target_inst"]);
                }

                return $targets;
        }

        function _getIdForImportId($a_type, $a_target)
        {
                switch($a_type)
                {
                        case "PageObject":
                                $id = ilLMObject::_getIdForImportId($a_target);
                                if($id > 0)
                                {
                                        return "il__pg_".$id;
                                }
                                break;

                        case "StructureObject":
                                $id = ilLMObject::_getIdForImportId($a_target);
                                if($id > 0)
                                {
                                        return "il__st_".$id;
                                }
                                break;

                        case "GlossaryItem":
                                $id = ilGlossaryTerm::_getIdForImportId($a_target);
                                if($id > 0)
                                {
                                        return "il__git_".$id;
                                }
                                break;

                        case "MediaObject":
                                $id = ilObjMediaObject::_getIdForImportId($a_target);
                                if($id > 0)
                                {
                                        return "il__mob_".$id;
                                }
                                break;
                }
                return false;
        }

        function _exists($a_type, $a_target)
        {
                global $tree;
                
                switch($a_type)
                {
                        case "PageObject":
                        case "StructureObject":
                                return ilLMObject::_exists($a_target);
                                break;

                        case "GlossaryItem":
                                return ilGlossaryTerm::_exists($a_target);
                                break;

                        case "MediaObject":
                                return ilObjMediaObject::_exists($a_target);
                                break;
                                
                        case "RepositoryItem":
                                if (is_int(strpos($a_target, "_")))
                                {
                                        $ref_id = ilInternalLink::_extractObjIdOfTarget($a_target);
                                        return $tree->isInTree($ref_id);
                                }
                                break;
                }
                return false;
        }

        
        function _extractInstOfTarget($a_target)
        {
                if (!is_int(strpos($a_target, "__")))
                {
                        $target = explode("_", $a_target);
                        if ($target[1] > 0)
                        {
                                return $target[1]; 
                        }
                }
                return false;
        }
        
        function _removeInstFromTarget($a_target)
        {
                if (!is_int(strpos($a_target, "__")))
                {
                        $target = explode("_", $a_target);
                        if ($target[1] > 0)
                        {
                                return "il__".$target[2]."_".$target[3]; 
                        }
                }
                return false;
        }
        
        function _extractObjIdOfTarget($a_target)
        {
                $target = explode("_", $a_target);
                return $target[count($target) - 1];
        }

}
?>