class.ilSCORM2004Node.php

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<?php

/* Copyright (c) 1998-2011 ILIAS open source, Extended GPL, see docs/LICENSE */


require_once("./Services/MetaData/classes/class.ilMDLanguageItem.php");

class ilSCORM2004Node
{
        var $slm_id;
        var $type;
        var $id;
        var $slm_object;

        function ilSCORM2004Node($a_slm_object, $a_id = 0)
        {
                $this->id = $a_id;
                $this->setSLMObject($a_slm_object);
                $this->setSLMId($a_slm_object->getId());

                include_once("./Modules/Scorm2004/classes/class.ilSCORM2004Tree.php");
                $this->tree = new ilSCORM2004Tree($a_slm_object->getId());
                /*$this->tree = new ilTree($a_slm_object->getId());
                $this->tree->setTableNames('sahs_sc13_tree', 'sahs_sc13_tree_node');
                $this->tree->setTreeTablePK("slm_id");*/

                if($a_id != 0)
                {
                        $this->read();
                }
        }

        function setTitle($a_title)
        {
                $this->title = $a_title;
        }

        function getTitle()
        {
                return $this->title;
        }

        function setDescription($a_description)
        {
                $this->description = $a_description;
        }

        function getDescription()
        {
                return $this->description;
        }

        function setType($a_type)
        {
                $this->type = $a_type;
        }

        function getType()
        {
                return $this->type;
        }

        function setSLMId($a_slm_id)
        {
                $this->slm_id = $a_slm_id;

        }

        function getSLMId()
        {
                return $this->slm_id;
        }

        function setSLMObject($a_slm_obj)
        {
                $this->slm_object = $a_slm_obj;
        }
        
        function getSLMObject()
        {
                return $this->slm_object;
        }

        function getContentObject()
        {
                return $this->slm_object;
        }

        function setId($a_id)
        {
                $this->id = $a_id;
        }

        function getId()
        {
                return $this->id;
        }

        function getImportId()
        {
                return $this->import_id;
        }

        function setImportId($a_id)
        {
                $this->import_id = $a_id;
        }

        function read()
        {
                global $ilBench, $ilDB;

                if(!isset($this->data_record))
                {
                        $query = "SELECT * FROM sahs_sc13_tree_node WHERE obj_id = ".
                                $ilDB->quote($this->id, "integer");
                        $obj_set = $ilDB->query($query);
                        $this->data_record = $ilDB->fetchAssoc($obj_set);
                }

                $this->type = $this->data_record["type"];
                $this->setImportId($this->data_record["import_id"]);
                $this->setTitle($this->data_record["title"]);
        }

        function MDUpdateListener($a_element)
        {
                include_once 'Services/MetaData/classes/class.ilMD.php';

                switch($a_element)
                {
                        case 'General':

                                // Update Title and description
                                $md = new ilMD($this->getSLMId(), $this->getId(), $this->getType());
                                $md_gen = $md->getGeneral();

                                ilSCORM2004Node::_writeTitle($this->getId(), $md_gen->getTitle());

                                foreach($md_gen->getDescriptionIds() as $id)
                                {
                                        $md_des = $md_gen->getDescription($id);
//                                      ilLMObject::_writeDescription($this->getId(),$md_des->getDescription());
                                        break;
                                }

                                break;

                        default:
                }
                return true;
        }


        function createMetaData()
        {
                global $ilUser;

                include_once 'Services/MetaData/classes/class.ilMDCreator.php';
                $md_creator = new ilMDCreator($this->getSLMId(), $this->getId(), $this->getType());
                $md_creator->setTitle($this->getTitle());
                $md_creator->setTitleLanguage($ilUser->getPref('language'));
                $md_creator->setDescription($this->getDescription());
                $md_creator->setDescriptionLanguage($ilUser->getPref('language'));
                $md_creator->setKeywordLanguage($ilUser->getPref('language'));
                $md_creator->setLanguage($ilUser->getPref('language'));
                $md_creator->create();

                return true;
        }

        function updateMetaData()
        {
                include_once("Services/MetaData/classes/class.ilMD.php");
                include_once("Services/MetaData/classes/class.ilMDGeneral.php");
                include_once("Services/MetaData/classes/class.ilMDDescription.php");

                $md = new ilMD($this->getSLMId(), $this->getId(), $this->getType());
                $md_gen = $md->getGeneral();
                $md_gen->setTitle($this->getTitle());

                // sets first description
                $md_des_ids = $md_gen->getDescriptionIds();
                if (count($md_des_ids) > 0)
                {
                        $md_des =& $md_gen->getDescription($md_des_ids[0]);
//                      $md_des->setDescription($this->getDescription());
                        $md_des->update();
                }
                $md_gen->update();
        }


        function deleteMetaData()
        {
                // Delete meta data
                include_once('Services/MetaData/classes/class.ilMD.php');
                $md = new ilMD($this->getSLMId(), $this->getId(), $this->getType());
                $md->deleteAll();
        }

        function setDataRecord($a_record)
        {
                $this->data_record = $a_record;
        }

        static function _lookupTitle($a_obj_id)
        {
                global $ilDB;

                $query = "SELECT * FROM sahs_sc13_tree_node WHERE obj_id = ".
                        $ilDB->quote($a_obj_id, "integer");
                $obj_set = $ilDB->query($query);
                $obj_rec = $ilDB->fetchAssoc($obj_set);

                return $obj_rec["title"];
        }
        
        static function _lookupType($a_obj_id)
        {
                global $ilDB;

                $query = "SELECT * FROM sahs_sc13_tree_node WHERE obj_id = ".
                        $ilDB->quote($a_obj_id, "integer");
                $obj_set = $ilDB->query($query);
                $obj_rec = $ilDB->fetchAssoc($obj_set);

                return $obj_rec["type"];
        }

        static function _writeTitle($a_obj_id, $a_title)
        {
                global $ilDB;

                $query = "UPDATE sahs_sc13_tree_node SET ".
                        " title = ".$ilDB->quote($a_title, "text").
                        " WHERE obj_id = ".$ilDB->quote($a_obj_id, "integer");
                $ilDB->manipulate($query);
        }

        static function _writeImportId($a_id, $a_import_id)
        {
                global $ilDB;

                $q = "UPDATE sahs_sc13_tree_node ".
                        "SET ".
                        "import_id = ".$ilDB->quote($a_import_id, "text").",".
                        "last_update = ".$ilDB->now().
                        "WHERE obj_id = ".$ilDB->quote($a_id, "integer");

                $ilDB->manipulate($q);
        }

        function create($a_upload = false)
        {
                global $ilDB;

                // insert object data
                $id = $ilDB->nextId("sahs_sc13_tree_node");
                $query = "INSERT INTO sahs_sc13_tree_node (obj_id, title, type, slm_id, import_id, create_date) ".
                        "VALUES (".
                        $ilDB->quote($id, "integer").",".
                        $ilDB->quote($this->getTitle(), "text").",".
                        $ilDB->quote($this->getType(), "text").", ".
                        $ilDB->quote($this->getSLMId(), "integer").",".
                        $ilDB->quote($this->getImportId(), "text").
                        ", ".$ilDB->now().")";
                $ilDB->manipulate($query);
                $this->setId($id);

                if (!$a_upload)
                {
                        $this->createMetaData();
                }
        }

        function update()
        {
                global $ilDB;

                $this->updateMetaData();

                $query = "UPDATE sahs_sc13_tree_node SET ".
                        " slm_id = ".$ilDB->quote($this->getSLMId(), "integer").
                        " ,title = ".$ilDB->quote($this->getTitle(), "text").
                        " WHERE obj_id = ".$ilDB->quote($this->getId(), "integer");

                $ilDB->manipulate($query);
        }

        function delete()
        {
                global $ilDB;
                
                $query = "DELETE FROM sahs_sc13_tree_node WHERE obj_id= ".
                        $ilDB->quote($this->getId(), "integer");
                $ilDB->manipulate($query);

                $this->deleteMetaData();
        }

        function _getIdForImportId($a_import_id)
        {
                global $ilDB;
                
                $ilDB->setLimit(1);
                $q = "SELECT * FROM sahs_sc13_tree_node WHERE import_id = ".
                        $ilDB->quote($a_import_id, "text")." ".
                        " ORDER BY create_date DESC";
                $obj_set = $ilDB->query($q);
                while ($obj_rec = $ilDB->fetchAssoc($obj_set))
                {
                        $slm_id = ilSCORM2004Node::_lookupSLMID($obj_rec["obj_id"]);

                        // link only in learning module, that is not trashed
                        if (ilObject::_hasUntrashedReference($slm_id))
                        {
                                return $obj_rec["obj_id"];
                        }
                }

                return 0;
        }
        
        function _exists($a_id)
        {
                global $ilDB;
                
                include_once("./Services/Link/classes/class.ilInternalLink.php");
                if (is_int(strpos($a_id, "_")))
                {
                        $a_id = ilInternalLink::_extractObjIdOfTarget($a_id);
                }
                
                $q = "SELECT * FROM sahs_sc13_tree_node WHERE obj_id = ".
                        $ilDB->quote($a_id, "integer");
                $obj_set = $ilDB->query($q);
                if ($obj_rec = $ilDB->fetchAssoc($obj_set))
                {
                        return true;
                }
                else
                {
                        return false;
                }

        }


        function _deleteAllSLMNodes($a_slm_object)
        {
                global $ilDB;
                
                $query = "SELECT * FROM sahs_sc13_tree_node ".
                        "WHERE slm_id = ".$ilDB->quote($a_slm_object->getId(), "integer")." ";
                $obj_set = $ilDB->query($query);

                require_once("./Modules/Scorm2004/classes/class.ilSCORM2004NodeFactory.php");
                while($obj_rec = $ilDB->fetchAssoc($obj_set))
                {
                        $node_obj = ilSCORM2004NodeFactory::getInstance($a_slm_object, $obj_rec["obj_id"],false);

                        if (is_object($node_obj))
                        {
                                $node_obj->delete();
                        }
                }

                return true;
        }

        function _lookupSLMID($a_id)
        {
                global $ilDB;

                $query = "SELECT * FROM sahs_sc13_tree_node WHERE obj_id = ".
                        $ilDB->quote($a_id, "integer")."";
                $obj_set = $ilDB->query($query);
                $obj_rec = $ilDB->fetchAssoc($obj_set);

                return $obj_rec["slm_id"];
        }

        static function putInTree($a_obj, $a_parent_id = "", $a_target_node_id = "")
        {
                $tree =& new ilTree($a_obj->getSLMId());
                $tree->setTreeTablePK("slm_id");
                $tree->setTableNames('sahs_sc13_tree', 'sahs_sc13_tree_node');

                // determine parent
                $parent_id = ($a_parent_id != "")
                        ? $a_parent_id
                        : $tree->getRootId();

                // determine target
                if ($a_target_node_id != "")
                {
                        $target = $a_target_node_id;
                }
                else
                {
                        // determine last child that serves as predecessor
                        $childs =& $tree->getChilds($parent_id);

                        if (count($childs) == 0)
                        {
                                $target = IL_FIRST_NODE;
                        }
                        else
                        {
                                $target = $childs[count($childs) - 1]["obj_id"];
                        }
                }

                if ($tree->isInTree($parent_id) && !$tree->isInTree($a_obj->getId()))
                {
                        $tree->insertNode($a_obj->getId(), $parent_id, $target);
                }
        }
        
        static function getTree($a_slm_obj_id)
        {
                $tree = new ilTree($a_slm_obj_id);
                $tree->setTableNames('sahs_sc13_tree', 'sahs_sc13_tree_node');
                $tree->setTreeTablePK("slm_id");
                $tree->readRootId();
                
                return $tree;
        }

        static function clipboardCopy($a_slm_obj_id, $a_ids)
        {
                global $ilUser;
                
                $tree = ilSCORM2004Node::getTree($a_slm_obj_id);
                
                $ilUser->clipboardDeleteObjectsOfType("page");
                $ilUser->clipboardDeleteObjectsOfType("chap");
                $ilUser->clipboardDeleteObjectsOfType("sco");
                $ilUser->clipboardDeleteObjectsOfType("ass");
                
                // put them into the clipboard
                $time = date("Y-m-d H:i:s", time());
                foreach ($a_ids as $id)
                {
                        $curnode = "";
                        if ($tree->isInTree($id))
                        {
                                $curnode = $tree->getNodeData($id);
                                $subnodes = $tree->getSubTree($curnode);
                                foreach($subnodes as $subnode)
                                {
                                        if ($subnode["child"] != $id)
                                        {
                                                $ilUser->addObjectToClipboard($subnode["child"],
                                                        $subnode["type"], $subnode["title"],
                                                        $subnode["parent"], $time, $subnode["lft"]);
                                        }
                                }
                        }
                        $order = ($curnode["lft"] > 0)
                                ? $curnode["lft"]
                                : (int) ($order + 1);
                        $ilUser->addObjectToClipboard($id,
                                ilSCORM2004Node::_lookupType($id), ilSCORM2004Node::_lookupTitle($id), 0, $time,
                                $order);
                }
        }

        function clipboardCut($a_slm_obj_id, $a_ids)
        {
                $tree = ilSCORM2004Node::getTree($a_slm_obj_id);
                
                if (!is_array($a_ids))
                {
                        return false;
                }
                else
                {
                        // get all "top" ids, i.e. remove ids, that have a selected parent
                        foreach($a_ids as $id)
                        {
                                $path = $tree->getPathId($id);
                                $take = true;
                                foreach($path as $path_id)
                                {
                                        if ($path_id != $id && in_array($path_id, $a_ids))
                                        {
                                                $take = false;
                                        }
                                }
                                if ($take)
                                {
                                        $cut_ids[] = $id;
                                }
                        }
                }
                
                ilSCORM2004Node::clipboardCopy($a_slm_obj_id, $cut_ids);
                
                // remove the objects from the tree
                // note: we are getting chapters, scos and pages which are *not* in the tree
                // we do not delete any pages/chapters here
                foreach ($cut_ids as $id)
                {
                        $curnode = $tree->getNodeData($id);
                        if ($tree->isInTree($id))
                        {
                                $tree->deleteTree($curnode);
                        }
                }

        }

        static function uniqueTypesCheck($a_items)
        {
                $types = array();
                if (is_array($a_items))
                {
                        foreach($a_items as $item)
                        {
                                $type = ilSCORM2004Node::_lookupType($item);
                                $types[$type] = $type;
                        }
                }

                if (count($types) > 1)
                {
                        return false;
                }
                return true;
        }

        static function insertPageClip($a_slm_obj)
        {
                global $ilUser;
                
                // @todo: move this to a service since it can be used here, too
                include_once("./Modules/LearningModule/classes/class.ilEditClipboard.php");

                include_once("./Modules/Scorm2004/classes/class.ilSCORM2004OrganizationHFormGUI.php");
                $node_id = ilSCORM2004OrganizationHFormGUI::getPostNodeId();
                $first_child = ilSCORM2004OrganizationHFormGUI::getPostFirstChild();
                
                $tree = ilSCORM2004Node::getTree($a_slm_obj->getId());
                
                if (!$first_child)      // insert after node id
                {
                        $parent_id = $tree->getParentId($node_id);
                        $target = $node_id;
                }
                else                                                                                                    // insert as first child
                {
                        $parent_id = $node_id;
                        $target = IL_FIRST_NODE;
                }

                // cut and paste
                $source_parent_type = "";
                if ($ilUser->getClipboardObjects("page"))
                {
                        $pages = $ilUser->getClipboardObjects("page");
                }
                else if ($ilUser->getClipboardObjects("pg"))
                {
                        $source_parent_type = "lm";
                        $pages = $ilUser->getClipboardObjects("pg");
                }
                $copied_nodes = array();

                foreach ($pages as $pg)
                {
                        $cid = ilSCORM2004Node::pasteTree($a_slm_obj, $pg["id"], $parent_id, $target,
                                $pg["insert_time"], $copied_nodes,
                                (ilEditClipboard::getAction() == "copy"), true, $source_parent_type);
                        $target = $cid;
                }
                //ilLMObject::updateInternalLinks($copied_nodes);

                if (ilEditClipboard::getAction() == "cut")
                {
                        $ilUser->clipboardDeleteObjectsOfType("page");
                        $ilUser->clipboardDeleteObjectsOfType("chap");
                        $ilUser->clipboardDeleteObjectsOfType("sco");
                        $ilUser->clipboardDeleteObjectsOfType("ass");
                        $ilUser->clipboardDeleteObjectsOfType("pg");
                        ilEditClipboard::clear();
                }
        }

        static function insertAssetClip($a_slm_obj, $a_type = "ass")
        {
                global $ilCtrl, $ilUser;
                
                // @todo: move this to a service since it can be used here, too
                include_once("./Modules/LearningModule/classes/class.ilEditClipboard.php");

                include_once("./Modules/Scorm2004/classes/class.ilSCORM2004OrganizationHFormGUI.php");
                $node_id = ilSCORM2004OrganizationHFormGUI::getPostNodeId();
                $first_child = ilSCORM2004OrganizationHFormGUI::getPostFirstChild();
                
                $tree = ilSCORM2004Node::getTree($a_slm_obj->getId());
                
                if (!$first_child)      // insert after node id
                {
                        $parent_id = $tree->getParentId($node_id);
                        $target = $node_id;
                }
                else                                                                                                    // insert as first child
                {
                        $parent_id = $node_id;
                        $target = IL_FIRST_NODE;
                }

                // cut and paste
                $scos = $ilUser->getClipboardObjects($a_type);
                $copied_nodes = array();
                foreach ($scos as $sco)
                {
                        $cid = ilSCORM2004Node::pasteTree($a_slm_obj, $sco["id"], $parent_id, $target,
                                $sco["insert_time"], $copied_nodes,
                                (ilEditClipboard::getAction() == "copy"));
                        $target = $cid;
                }
                //ilLMObject::updateInternalLinks($copied_nodes);

                if (ilEditClipboard::getAction() == "cut")
                {
                        $ilUser->clipboardDeleteObjectsOfType("page");
                        $ilUser->clipboardDeleteObjectsOfType("chap");
                        $ilUser->clipboardDeleteObjectsOfType("sco");
                        $ilUser->clipboardDeleteObjectsOfType("ass");
                        ilEditClipboard::clear();
                }
        }

        static function insertScoClip($a_slm_obj)
        {
                self::insertAssetClip($a_slm_obj, "sco");
        }


        function insertChapterClip($a_slm_obj, $a_as_sub = false)
        {
                global $ilUser, $ilCtrl, $ilLog;
                
                // @todo: move this to a service since it can be used here, too
                include_once("./Modules/LearningModule/classes/class.ilEditClipboard.php");
                
                include_once("./Modules/Scorm2004/classes/class.ilSCORM2004OrganizationHFormGUI.php");
                $node_id = ilSCORM2004OrganizationHFormGUI::getPostNodeId();
                $first_child = ilSCORM2004OrganizationHFormGUI::getPostFirstChild();
                
                $tree = ilSCORM2004Node::getTree($a_slm_obj->getId());
                
                if ($a_as_sub)          // as subchapter
                {
                        if (!$first_child)      // insert under parent
                        {
                                $parent_id = $node_id;
                                $target = "";
                        }
                        else                                                                                                    // we shouldnt end up here
                        {
                                return;
                        }
                }
                else    // as chapter
                {
                        if (!$first_child)      // insert after node id
                        {
                                $parent_id = $tree->getParentId($node_id);
                                $target = $node_id;
                        }
                        else                                                                                                    // insert as first child
                        {
                                $parent_id = $node_id;
                                $target = IL_FIRST_NODE;
                                
                                // do not move a chapter in front of a sco (maybe never needed)
                                $childs = $tree->getChildsByType($parent_id, "sco");
                                if (count($childs) != 0)
                                {
                                        $target = $childs[count($childs) - 1]["obj_id"];
                                }
                        }
                }
                
                // copy and paste
                $chapters = $ilUser->getClipboardObjects("chap", true);
                $copied_nodes = array();
                foreach ($chapters as $chap)
                {
                        $cid = ilSCORM2004Node::pasteTree($a_slm_obj, $chap["id"], $parent_id,
                                $target, $chap["insert_time"], $copied_nodes,
                                (ilEditClipboard::getAction() == "copy"));
                        $target = $cid;
                }
                //ilLMObject::updateInternalLinks($copied_nodes);

                if (ilEditClipboard::getAction() == "cut")
                {
                        $ilUser->clipboardDeleteObjectsOfType("page");
                        $ilUser->clipboardDeleteObjectsOfType("chap");
                        $ilUser->clipboardDeleteObjectsOfType("sco");
                        $ilUser->clipboardDeleteObjectsOfType("ass");
                        ilEditClipboard::clear();
                }
        }

        static function pasteTree($a_target_slm, $a_item_id, $a_parent_id, $a_target, $a_insert_time,
                &$a_copied_nodes, $a_as_copy = false, $a_from_clipboard = true, $a_source_parent_type = "")
        {
                global $ilUser, $ilLog;

                $item_type = "";

                if (in_array($a_source_parent_type, array("", "sahs")))
                {
                        // source lm id, item type and lm object
                        $item_slm_id = ilSCORM2004Node::_lookupSLMID($a_item_id);
                        $item_type = ilSCORM2004Node::_lookupType($a_item_id);
                        //$slm_obj = $ilias->obj_factory->getInstanceByObjId($item_slm_id);

                        include_once("./Modules/Scorm2004/classes/class.ilObjSCORM2004LearningModule.php");
                        $slm_obj = new ilObjSCORM2004LearningModule($item_slm_id, false);

                        $ilLog->write("Getting from clipboard type ".$item_type.", ".
                                "Item ID: ".$a_item_id.", of original SLM: ".$item_slm_id);
                }
                else if (in_array($a_source_parent_type, array("lm")))
                {
                        include_once("./Modules/LearningModule/classes/class.ilLMObject.php");
                        $item_lm_id = ilLMObject::_lookupContObjId($a_item_id);
                        $item_type = ilLMObject::_lookupType($a_item_id, $item_lm_id);

                        include_once("./Modules/LearningModule/classes/class.ilObjLearningModule.php");
                        $lm_obj = new ilObjLearningModule($item_lm_id, false);

                        $ilLog->write("Getting from clipboard type ".$item_type.", ".
                                "Item ID: ".$a_item_id.", of original SLM: ".$item_lm_id);
                }



                if ($item_type == "chap")
                {
                        include_once("./Modules/Scorm2004/classes/class.ilSCORM2004Chapter.php");
                        $item = new ilSCORM2004Chapter($slm_obj, $a_item_id);
                }
                else if ($item_type == "page")
                {
                        include_once("./Modules/Scorm2004/classes/class.ilSCORM2004PageNode.php");
                        $item = new ilSCORM2004PageNode($slm_obj, $a_item_id);
                }
                else if ($item_type == "sco")
                {
                        include_once("./Modules/Scorm2004/classes/class.ilSCORM2004Sco.php");
                        $item = new ilSCORM2004Sco($slm_obj, $a_item_id);
                }
                else if ($item_type == "ass")
                {
                        include_once("./Modules/Scorm2004/classes/class.ilSCORM2004Asset.php");
                        $item = new ilSCORM2004Asset($slm_obj, $a_item_id);
                }
                else if ($item_type == "pg")
                {
                        include_once("./Modules/LearningModule/classes/class.ilLMPageObject.php");
                        $item = new ilLMPageObject($lm_obj, $a_item_id);
                }


                if ($item_slm_id != $a_target_slm->getId() && !$a_as_copy)
                {
                        // @todo: check whether st is NOT in tree
                        
                        // "move" metadata to new lm
                        include_once("Services/MetaData/classes/class.ilMD.php");
                        $md = new ilMD($item_slm_id, $item->getId(), $item->getType());
                        $new_md = $md->cloneMD($a_target_slm->getId(), $item->getId(), $item->getType());
                        
                        // update lm object
                        $item->setSLMId($a_target_slm->getId());
                        $item->setSLMObject($a_target_slm);
                        $item->update();
                        
                        // delete old meta data set
                        $md->deleteAll();
                        
                        if ($item_type == "page")
                        {
                                $page = $item->getPageObject();
                                $page->buildDom($a_from_clipboard);
                                $page->setParentId($a_target_slm->getId());
                                $page->update();
                        }
                }

                if ($a_as_copy)
                {
                        if ($a_source_parent_type == "lm")
                        {
                                if ($item_type = "pg")
                                {
                                        include_once("./Modules/Scorm2004/classes/class.ilSCORM2004PageNode.php");
                                        $target_item = ilSCORM2004PageNode::copyPageFromLM($a_target_slm, $item);
                                }
                        }
                        else
                        {
                                $target_item = $item->copy($a_target_slm);
                        }
                        $a_copied_nodes[$item->getId()] = $target_item->getId();
                }
                else
                {
                        $target_item = $item;
                }
                
                $ilLog->write("Putting into tree type ".$target_item->getType().
                        "Item ID: ".$target_item->getId().", Parent: ".$a_parent_id.", ".
                        "Target: ".$a_target.", Item LM:".$target_item->getContentObject()->getId());
                
                ilSCORM2004Node::putInTree($target_item, $a_parent_id, $a_target);
                
                if ($a_from_clipboard)
                {
                        $childs = $ilUser->getClipboardChilds($item->getId(), $a_insert_time);
                }
                else
                {
                        // get childs of source tree
                        $source_tree = $slm_obj->getTree();
                        $childs = $source_tree->getChilds($a_item_id);
                }

                foreach($childs as $child)
                {
                        $child_id = ($a_from_clipboard)
                                ? $child["id"]
                                : $child["child"];
                        ilSCORM2004Node::pasteTree($a_target_slm, $child_id, $target_item->getId(),
                                IL_LAST_NODE, $a_insert_time, $a_copied_nodes, $a_as_copy, $a_from_clipboard, $a_source_parent_type);
                }
                
                return $target_item->getId();
        }
        
        //Methods for Sequencing
        
        //objectives per node
        public function getObjectives()
        {
                include_once("./Modules/Scorm2004/classes/seq_editor/class.ilSCORM2004Objective.php");
                return ilSCORM2004Objective::fetchAllObjectives($this->slm_object,$this->getId());
        }
        
        public function deleteSeqInfo()
        {
                include_once("./Modules/Scorm2004/classes/seq_editor/class.ilSCORM2004Item.php");
                $seq_item = new ilSCORM2004Item($this->getId());
                $seq_item -> delete();
        }
        
        //function currently unused - shouldn't be removed if subchapter support may be added in the future
        public function parentHasSeqTemplate(){
                include_once("./Modules/Scorm2004/classes/seq_editor/class.ilSCORM2004Utilities.php");
                $seq_util = new ilSCORM2004Utilities($this->getId());
                return $seq_util -> parentHasSeqTemplate($this->slm_object);
        }
        
        
        public function exportAsScorm12() {
                //to implement
                return;
        }
        
        public function exportAsScorm13() {
                //to implement
                return;
        }
        
        

}
?>