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
{
    protected $db;

    protected $user;

    public $slm_id;
    public $type;
    public $id;
    public $slm_object;

    public function __construct($a_slm_object, $a_id = 0)
    {
        global $DIC;

        $this->db = $DIC->database();
        $this->user = $DIC->user();
        $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();
        }
    }

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

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

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

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

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

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

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

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

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

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

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

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

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

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

    public function read()
    {
        $ilDB = $this->db;

        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"]);
    }

    public 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;
    }


    public function createMetaData()
    {
        $ilUser = $this->user;

        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;
    }

    public 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();
    }


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

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

    public static function _lookupTitle($a_obj_id)
    {
        global $DIC;

        $ilDB = $DIC->database();

        $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"];
    }
    
    public static function _lookupType($a_obj_id)
    {
        global $DIC;

        $ilDB = $DIC->database();

        $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"];
    }

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

        $ilDB = $DIC->database();

        $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);
    }

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

        $ilDB = $DIC->database();

        $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);
    }

    public function create($a_upload = false)
    {
        $ilDB = $this->db;

        // 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();
        }
    }

    public function update()
    {
        $ilDB = $this->db;

        $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);
    }

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

        $this->deleteMetaData();
    }

    public static function _getIdForImportId($a_import_id)
    {
        global $DIC;

        $ilDB = $DIC->database();
        
        $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;
    }
    
    public static function _exists($a_id)
    {
        global $DIC;

        $ilDB = $DIC->database();
        
        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;
        }
    }


    public static function _deleteAllSLMNodes($a_slm_object)
    {
        global $DIC;

        $ilDB = $DIC->database();
        
        $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;
    }

    public static function _lookupSLMID($a_id)
    {
        global $DIC;

        $ilDB = $DIC->database();

        $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"];
    }

    public 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);
        }
    }
    
    public 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;
    }

    public static function clipboardCopy($a_slm_obj_id, $a_ids)
    {
        global $DIC;

        $ilUser = $DIC->user();
        
        $tree = ilSCORM2004Node::getTree($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
            );
        }
    }

    public static 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);
            }
        }
    }

    public 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;
    }

    public static function insertPageClip($a_slm_obj)
    {
        global $DIC;

        $ilUser = $DIC->user();
        
        // @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 = $ilUser->getClipboardObjects("page");
        } elseif ($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();
        }
    }

    public static function insertAssetClip($a_slm_obj, $a_type = "ass")
    {
        global $DIC;

        $ilCtrl = $DIC->ctrl();
        $ilUser = $DIC->user();
        
        // @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();
        }
    }

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


    public static function insertChapterClip($a_slm_obj, $a_as_sub = false)
    {
        global $DIC;

        $ilUser = $DIC->user();
        $ilCtrl = $DIC->ctrl();
        $ilLog = $DIC["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();
        }
    }

    public 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 $DIC;

        $ilUser = $DIC->user();
        $ilLog = $DIC["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);

            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: " . $item_slm_id);
        } elseif (in_array($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, $a_item_id);
        } elseif ($item_type == "page") {
            include_once("./Modules/Scorm2004/classes/class.ilSCORM2004PageNode.php");
            $item = new ilSCORM2004PageNode($slm_obj, $a_item_id);
        } elseif ($item_type == "sco") {
            include_once("./Modules/Scorm2004/classes/class.ilSCORM2004Sco.php");
            $item = new ilSCORM2004Sco($slm_obj, $a_item_id);
        } elseif ($item_type == "ass") {
            include_once("./Modules/Scorm2004/classes/class.ilSCORM2004Asset.php");
            $item = new ilSCORM2004Asset($slm_obj, $a_item_id);
        } elseif ($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;
    }
}