class.ilInternalLink.php

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<?php
/* Copyright (c) 1998-2009 ILIAS open source, Extended GPL, see docs/LICENSE */

class ilInternalLink
{
        static function _deleteAllLinksOfSource($a_source_type, $a_source_id, $a_lang = "-")
        {
                global $ilias, $ilDB;

                $lang_where = "";
                if ($a_lang != "")
                {
                        $lang_where = " AND source_lang = ".$ilDB->quote($a_lang, "text");
                }
                
                $q = "DELETE FROM int_link WHERE source_type = ".
                        $ilDB->quote($a_source_type, "text")." AND source_id=".
                        $ilDB->quote((int) $a_source_id, "integer").
                        $lang_where;
                $ilDB->manipulate($q);
        }

        static function _deleteAllLinksToTarget($a_target_type, $a_target_id, $a_target_inst = 0)
        {
                global $ilias, $ilDB;

                $ilDB->manipulateF("DELETE FROM int_link WHERE target_type = %s ".
                        " AND target_id = %s AND target_inst = %s ",
                        array("text", "integer", "integer"),
                        array($a_target_type, (int) $a_target_id, (int) $a_target_inst));
        }

        static function _saveLink($a_source_type, $a_source_id, $a_target_type, $a_target_id, $a_target_inst = 0,
                $a_source_lang = "-")
        {
                global $ilDB;

                $ilDB->replace("int_link",
                        array(
                                "source_type" => array("text", $a_source_type),
                                "source_id" => array("integer", (int) $a_source_id),
                                "source_lang" => array("text", $a_source_lang),
                                "target_type" => array("text", $a_target_type),
                                "target_id" => array("integer", (int) $a_target_id),
                                "target_inst" => array("integer", (int) $a_target_inst)
                        ),
                        array()
                );
        }

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

                $q = "SELECT * FROM int_link WHERE ".
                        "target_type = ".$ilDB->quote($a_target_type, "text")." AND ".
                        "target_id = ".$ilDB->quote((int) $a_target_id, "integer")." AND ".
                        "target_inst = ".$ilDB->quote((int) $a_target_inst, "integer");
                $source_set = $ilDB->query($q);
                $sources = array();
                while ($source_rec = $ilDB->fetchAssoc($source_set))
                {
                        $sources[$source_rec["source_type"].":".$source_rec["source_id"].":".$source_rec["source_lang"]] =
                                array("type" => $source_rec["source_type"], "id" => $source_rec["source_id"],
                                        "lang" => $source_rec["source_lang"]);
                }

                return $sources;
        }

        static function _getTargetsOfSource($a_source_type, $a_source_id, $a_source_lang = "-")
        {
                global $ilDB;

                $lang_where = "";
                if ($a_source_lang != "")
                {
                        $lang_where = " AND source_lang = ".$ilDB->quote($a_source_lang, "text");
                }

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

                $target_set = $ilDB->query($q);
                $targets = array();
                while ($target_rec = $ilDB->fetchAssoc($target_set))
                {
                        $targets[$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;
        }

        static function _getIdForImportId($a_type, $a_target)
        {
                include_once("./Modules/LearningModule/classes/class.ilLMObject.php");
                switch($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":
                                include_once("./Modules/Glossary/classes/class.ilGlossaryTerm.php");
                                $id = ilGlossaryTerm::_getIdForImportId($a_target);
                                //echo "+".$id."+".$a_target."+";
                                if($id > 0)
                                {
                                        return "il__git_".$id;
                                }
                                break;

                        case "WikiPage":
                                // no import IDs for wiki pages (yet)
                                //$id = ilGlossaryTerm::_getIdForImportId($a_target);
                                $id = 0;
                                if($id > 0)
                                {
                                        return "il__wpage_".$id;
                                }
                                break;

                        case "MediaObject":
                                $id = ilObjMediaObject::_getIdForImportId($a_target);
                                if($id > 0)
                                {
                                        return "il__mob_".$id;
                                }
                                break;
                                
                        case "RepositoryItem":
                                
                                $tarr = explode("_", $a_target);
                                $import_id = $a_target;
                                
                                // if a ref id part is given, strip this
                                // since this will not be part of an import id
                                // see also bug #6685
                                if ($tarr[4] != "")
                                {
                                        $import_id = $tarr[0]."_".$tarr[1]."_".$tarr[2]."_".$tarr[3]; 
                                }

                                $id = ilObject::_getIdForImportId($import_id);

                                // get ref id for object id
                                // (see ilPageObject::insertInstIntoIDs for the export procedure)
                                if($id > 0)
                                {
                                        $refs = ilObject::_getAllReferences($id);
                                        foreach ($refs as $ref)
                                        {
                                                return "il__obj_".$ref;
                                        }
                                }

                                // 26 Sep 2018: moved this under the import id handling above
                                // If an imported object is found, this is always preferred.
                                // see also bug #23324
                                if (ilInternalLink::_extractInstOfTarget($a_target) == IL_INST_ID
                                        && IL_INST_ID > 0)
                                {
                                        // does it have a ref id part?
                                        if ($tarr[4] != "")
                                        {
                                                return "il__obj_".$tarr[4];
                                        }
                                }

                                break;

                }
                return false;
        }

        static function _exists($a_type, $a_target)
        {
                global $tree;
                
                switch($a_type)
                {
                        case "PageObject":
                        case "StructureObject":
                                include_once("./Modules/LearningModule/classes/class.ilLMObject.php");
                                return ilLMObject::_exists($a_target);
                                break;

                        case "GlossaryItem":
                                include_once("./Modules/Glossary/classes/class.ilGlossaryTerm.php");
                                return ilGlossaryTerm::_exists($a_target);
                                break;

                        case "MediaObject":
                                include_once("./Services/MediaObjects/classes/class.ilObjMediaObject.php");
                                return ilObjMediaObject::_exists($a_target);
                                break;
                                
                        case "WikiPage":
                                include_once("./Modules/Wiki/classes/class.ilWikiPage.php");
                                return ilWikiPage::_exists("wiki", (int)$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;
        }

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

        static function _extractTypeOfTarget($a_target)
        {
                $target = explode("_", $a_target);
                return $target[count($target) - 2];
        }
}
?>