class.ilObjStudyProgrammeReferenceGUI.php

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<?php
class ilObjStudyProgrammeReferenceGUI extends ilContainerReferenceGUI
{
    public function __construct($a_data, $a_id, $a_call_by_reference = true, $a_prepare_output = false)
    {
        $this->target_type = 'prg';
        $this->reference_type = 'prgr';
        parent::__construct($a_data, $a_id, $a_call_by_reference, $a_prepare_output);
    }

    public static function _goto($a_target)
    {
        $target_ref_id = ilContainerReference::_lookupTargetRefId(ilObject::_lookupObjId($a_target));
        ilObjStudyProgrammeGUI::_goto($target_ref_id);
    }

    public function saveObject()
    {
        $ilAccess = $this->access;
        
        if (!(int) $_REQUEST['target_id']) {
            $this->createObject();
            return false;
        }
        if (!$ilAccess->checkAccess('visible', '', (int) $_REQUEST['target_id'])) {
            ilUtil::sendFailure($this->lng->txt('permission_denied'));
            $this->createObject();
            return false;
        }
        if ($this->tryingToCreateCircularReference((int) $_REQUEST['target_id'], (int) $_REQUEST['ref_id'])) {
            ilUtil::sendFailure($this->lng->txt('prgr_may_not_create_circular_reference'));
            $this->createObject();
            return false;
        }
        parent::saveObject();
    }


    public function putObjectInTree(ilObject $a_obj, $a_parent_node_id = null)
    {
        // when this is called, the target allready should be defined...
        $target_obj_id = ilObject::_lookupObjId((int) $this->form->getInput('target_id'));
        $a_obj->setTargetId($target_obj_id);
        $a_obj->update();
        parent::putObjectInTree($a_obj, $a_parent_node_id);
    }

    protected function tryingToCreateCircularReference($obj_to_be_referenced, $reference_position)
    {
        if ($reference_position === $obj_to_be_referenced) {
            return true;
        }
        $queque = [$reference_position];
        while ($parent = array_shift($queque)) {
            $p_parent = (int) $this->tree->getParentId($parent);
            if ($p_parent === $obj_to_be_referenced) {
                return true;
            }
            if (ilObject::_lookupType($p_parent, true) === 'prg') {
                array_push($queque, $p_parent);
            }
            foreach (ilContainerReference::_lookupSourceIds(ilObject::_lookupObjId($parent)) as $parent_ref_obj_id) {
                $parent_ref_ref_id = (int) array_shift(ilObject::_getAllReferences($parent_ref_obj_id));
                $parent_ref_loc = (int) $this->tree->getParentId($parent_ref_ref_id);
                if ($parent_ref_loc === $obj_to_be_referenced) {
                    return true;
                }
                if (ilObject::_lookupType($parent_ref_loc, true) === 'prg') {
                    array_push($queque, $parent_ref_loc);
                }
            }
        }
        return false;
    }
}