/**
  * execute command
  */
 function executeCommand()
 {
     global $ilAccess, $ilNavigationHistory, $ilCtrl, $ilErr, $tpl, $lng, $ilTabs, $ilPluginAdmin, $ilDB, $tree, $ilias, $ilUser;
     if (!$ilAccess->checkAccess("read", "", $_GET["ref_id"])) {
         $ilias->raiseError($this->lng->txt("permission_denied"), $ilias->error_obj->MESSAGE);
     }
     $cmd = $this->ctrl->getCmd("infoScreen");
     $cmdsDisabledDueToOfflineStatus = array('resumePlayer', 'resumePlayer', 'outUserResultsOverview', 'outUserListOfAnswerPasses');
     if (!$this->getCreationMode() && !$this->object->isOnline() && in_array($cmd, $cmdsDisabledDueToOfflineStatus)) {
         $cmd = 'infoScreen';
     }
     $next_class = $this->ctrl->getNextClass($this);
     $this->ctrl->setReturn($this, "infoScreen");
     if (method_exists($this->object, "getTestStyleLocation")) {
         $this->tpl->addCss($this->object->getTestStyleLocation("output"), "screen");
     }
     // add entry to navigation history
     if (!$this->getCreationMode() && $ilAccess->checkAccess("read", "", $_GET["ref_id"])) {
         $ilNavigationHistory->addItem($_GET["ref_id"], "ilias.php?baseClass=ilObjTestGUI&cmd=infoScreen&ref_id=" . $_GET["ref_id"], "tst");
     }
     if (!$this->getCreationMode()) {
         if (IS_PAYMENT_ENABLED) {
             require_once 'Services/Payment/classes/class.ilPaymentObject.php';
             if (ilPaymentObject::_requiresPurchaseToAccess($this->object->getRefId(), $type = isset($_GET['purchasetype']) ? $_GET['purchasetype'] : NULL)) {
                 $this->setLocator();
                 $this->tpl->getStandardTemplate();
                 include_once 'Services/Payment/classes/class.ilShopPurchaseGUI.php';
                 $pp = new ilShopPurchaseGUI((int) $_GET['ref_id']);
                 $ret = $this->ctrl->forwardCommand($pp);
                 $this->tpl->show();
                 exit;
             }
         }
     }
     // elba hack for storing question id for inserting new question after
     if ($_REQUEST['prev_qid']) {
         global $___prev_question_id;
         $___prev_question_id = $_REQUEST['prev_qid'];
         $this->ctrl->setParameter($this, 'prev_qid', $_REQUEST['prev_qid']);
     }
     if (!$this->getCreationMode() && $this->testQuestionSetConfigFactory->getQuestionSetConfig()->areDepenciesBroken()) {
         if (!$this->isValidRequestOnBrokenQuestionSetDepencies($next_class, $cmd)) {
             $this->ctrl->redirectByClass('ilObjTestGUI', 'infoScreen');
         }
     }
     $this->determineObjectiveOrientedContainer();
     switch ($next_class) {
         case 'iltestexportgui':
             if (!$ilAccess->checkAccess('write', '', $this->ref_id)) {
                 $ilErr->raiseError($this->lng->txt('permission_denied'), $ilErr->WARNING);
             }
             $this->prepareOutput();
             $this->addHeaderAction();
             require_once 'Modules/Test/classes/class.ilTestExportGUI.php';
             $ilCtrl->forwardCommand(new ilTestExportGUI($this));
             break;
         case "ilinfoscreengui":
             $this->prepareOutput();
             $this->addHeaderAction();
             $this->infoScreen();
             // forwards command
             break;
         case 'ilmdeditorgui':
             if (!$ilAccess->checkAccess('write', '', $this->object->getRefId())) {
                 $ilErr->raiseError($this->lng->txt('permission_denied'), $ilErr->WARNING);
             }
             $this->prepareOutput();
             $this->addHeaderAction();
             require_once 'Services/MetaData/classes/class.ilMDEditorGUI.php';
             $md_gui =& new ilMDEditorGUI($this->object->getId(), 0, $this->object->getType());
             $md_gui->addObserver($this->object, 'MDUpdateListener', 'General');
             $this->ctrl->forwardCommand($md_gui);
             break;
         case "iltestplayerfixedquestionsetgui":
             require_once "./Modules/Test/classes/class.ilTestPlayerFixedQuestionSetGUI.php";
             if (!$this->object->getKioskMode()) {
                 $this->prepareOutput();
             }
             $gui = new ilTestPlayerFixedQuestionSetGUI($this->object);
             $gui->setObjectiveOrientedContainer($this->getObjectiveOrientedContainer());
             $this->ctrl->forwardCommand($gui);
             break;
         case "iltestplayerrandomquestionsetgui":
             require_once "./Modules/Test/classes/class.ilTestPlayerRandomQuestionSetGUI.php";
             if (!$this->object->getKioskMode()) {
                 $this->prepareOutput();
             }
             $gui = new ilTestPlayerRandomQuestionSetGUI($this->object);
             $gui->setObjectiveOrientedContainer($this->getObjectiveOrientedContainer());
             $this->ctrl->forwardCommand($gui);
             break;
         case "iltestplayerdynamicquestionsetgui":
             require_once "./Modules/Test/classes/class.ilTestPlayerDynamicQuestionSetGUI.php";
             if (!$this->object->getKioskMode()) {
                 $this->prepareOutput();
             }
             $gui = new ilTestPlayerDynamicQuestionSetGUI($this->object);
             $gui->setObjectiveOrientedContainer($this->getObjectiveOrientedContainer());
             $this->ctrl->forwardCommand($gui);
             break;
         case "iltestevaluationgui":
             $this->forwardToEvaluationGUI();
             break;
         case "iltestevalobjectiveorientedgui":
             $this->forwardToEvalObjectiveOrientedGUI();
             break;
         case "iltestservicegui":
             $this->prepareOutput();
             $this->addHeaderAction();
             require_once "./Modules/Test/classes/class.ilTestServiceGUI.php";
             $serviceGUI =& new ilTestServiceGUI($this->object);
             $this->ctrl->forwardCommand($serviceGUI);
             break;
         case 'ilpermissiongui':
             $this->prepareOutput();
             $this->addHeaderAction();
             include_once "Services/AccessControl/classes/class.ilPermissionGUI.php";
             $perm_gui =& new ilPermissionGUI($this);
             $ret =& $this->ctrl->forwardCommand($perm_gui);
             break;
         case "illearningprogressgui":
             $this->prepareOutput();
             $this->addHeaderAction();
             require_once './Services/Tracking/classes/class.ilLearningProgressGUI.php';
             $new_gui =& new ilLearningProgressGUI(ilLearningProgressGUI::LP_CONTEXT_REPOSITORY, $this->object->getRefId());
             $this->ctrl->forwardCommand($new_gui);
             break;
         case "ilcertificategui":
             $this->prepareOutput();
             $this->addHeaderAction();
             require_once "./Services/Certificate/classes/class.ilCertificateGUI.php";
             require_once "./Modules/Test/classes/class.ilTestCertificateAdapter.php";
             $output_gui = new ilCertificateGUI(new ilTestCertificateAdapter($this->object));
             $this->ctrl->forwardCommand($output_gui);
             break;
         case "iltestscoringgui":
             $this->prepareOutput();
             $this->addHeaderAction();
             require_once "./Modules/Test/classes/class.ilTestScoringGUI.php";
             $output_gui = new ilTestScoringGUI($this->object);
             $this->ctrl->forwardCommand($output_gui);
             break;
         case 'ilmarkschemagui':
             if (!$ilAccess->checkAccess('write', '', $this->object->getRefId())) {
                 ilUtil::sendInfo($this->lng->txt('cannot_edit_test'), true);
                 $this->ctrl->redirect($this, 'infoScreen');
             }
             $this->prepareOutput();
             $this->addHeaderAction();
             require_once 'Modules/Test/classes/class.ilMarkSchemaGUI.php';
             $mark_schema_gui = new ilMarkSchemaGUI($this->object);
             $this->ctrl->forwardCommand($mark_schema_gui);
             break;
         case 'iltestscoringbyquestionsgui':
             $this->prepareOutput();
             $this->addHeaderAction();
             include_once 'Modules/Test/classes/class.ilTestScoringByQuestionsGUI.php';
             $output_gui = new ilTestScoringByQuestionsGUI($this->object);
             $this->ctrl->forwardCommand($output_gui);
             break;
         case 'ilobjtestsettingsgeneralgui':
             $this->prepareOutput();
             $this->addHeaderAction();
             require_once 'Modules/Test/classes/class.ilObjTestSettingsGeneralGUI.php';
             $gui = new ilObjTestSettingsGeneralGUI($this->ctrl, $ilAccess, $this->lng, $this->tpl, $this->tree, $ilDB, $ilPluginAdmin, $ilUser, $this);
             $this->ctrl->forwardCommand($gui);
             break;
         case 'ilobjtestsettingsscoringresultsgui':
             $this->prepareOutput();
             $this->addHeaderAction();
             require_once 'Modules/Test/classes/class.ilObjTestSettingsScoringResultsGUI.php';
             $gui = new ilObjTestSettingsScoringResultsGUI($this->ctrl, $ilAccess, $this->lng, $this->tpl, $this->tree, $ilDB, $ilPluginAdmin, $this);
             $this->ctrl->forwardCommand($gui);
             break;
         case 'ilobjtestdynamicquestionsetconfiggui':
             $this->prepareOutput();
             $this->addHeaderAction();
             require_once 'Modules/Test/classes/class.ilObjTestDynamicQuestionSetConfigGUI.php';
             $gui = new ilObjTestDynamicQuestionSetConfigGUI($this->ctrl, $ilAccess, $ilTabs, $this->lng, $this->tpl, $ilDB, $tree, $ilPluginAdmin, $this->object);
             $this->ctrl->forwardCommand($gui);
             break;
         case 'iltestrandomquestionsetconfiggui':
             $this->prepareOutput();
             $this->addHeaderAction();
             require_once 'Modules/Test/classes/class.ilTestRandomQuestionSetConfigGUI.php';
             $gui = new ilTestRandomQuestionSetConfigGUI($this->ctrl, $ilAccess, $ilTabs, $this->lng, $this->tpl, $ilDB, $tree, $ilPluginAdmin, $this->object);
             $this->ctrl->forwardCommand($gui);
             break;
         case 'iltestquestionbrowsertablegui':
             $this->prepareOutput();
             $this->addHeaderAction();
             require_once 'Modules/Test/classes/tables/class.ilTestQuestionBrowserTableGUI.php';
             $gui = new ilTestQuestionBrowserTableGUI($this->ctrl, $this->tpl, $ilTabs, $this->lng, $tree, $ilDB, $ilPluginAdmin, $this->object);
             $gui->setWriteAccess($ilAccess->checkAccess("write", "", $this->ref_id));
             $gui->init();
             $this->ctrl->forwardCommand($gui);
             break;
         case 'iltestskilladministrationgui':
             $this->prepareOutput();
             $this->addHeaderAction();
             require_once 'Modules/Test/classes/class.ilTestSkillAdministrationGUI.php';
             $gui = new ilTestSkillAdministrationGUI($ilias, $this->ctrl, $ilAccess, $ilTabs, $this->tpl, $this->lng, $ilDB, $tree, $ilPluginAdmin, $this->object, $this->ref_id);
             $this->ctrl->forwardCommand($gui);
             break;
         case 'iltestskillevaluationgui':
             $this->prepareOutput();
             $this->addHeaderAction();
             require_once 'Modules/TestQuestionPool/classes/class.ilAssQuestionList.php';
             if ($this->object->isDynamicTest()) {
                 require_once 'Modules/Test/classes/class.ilObjTestDynamicQuestionSetConfig.php';
                 $dynamicQuestionSetConfig = new ilObjTestDynamicQuestionSetConfig($tree, $ilDB, $ilPluginAdmin, $this->object);
                 $dynamicQuestionSetConfig->loadFromDb();
                 $questionList = new ilAssQuestionList($ilDB, $this->lng, $ilPluginAdmin);
                 $questionList->setParentObjId($dynamicQuestionSetConfig->getSourceQuestionPoolId());
                 $questionList->setQuestionInstanceTypeFilter(ilAssQuestionList::QUESTION_INSTANCE_TYPE_ORIGINALS);
             } else {
                 $questionList = new ilAssQuestionList($ilDB, $this->lng, $ilPluginAdmin);
                 $questionList->setParentObjId($this->object->getId());
                 $questionList->setQuestionInstanceTypeFilter(ilAssQuestionList::QUESTION_INSTANCE_TYPE_DUPLICATES);
             }
             $questionList->load();
             require_once 'Modules/Test/classes/class.ilTestSessionFactory.php';
             $testSessionFactory = new ilTestSessionFactory($this->object);
             $testSession = $testSessionFactory->getSession();
             $testResults = $this->object->getTestResult($testSession->getActiveId(), $testSession->getPass(), true);
             require_once 'Modules/Test/classes/class.ilTestSkillEvaluationGUI.php';
             $gui = new ilTestSkillEvaluationGUI($this->ctrl, $ilTabs, $this->tpl, $this->lng, $ilDB, $this->object->getTestId(), $this->object->getRefId(), $this->object->getId());
             $gui->setObjectiveOrientedContainer($this->getObjectiveOrientedContainer());
             $gui->setQuestionList($questionList);
             $gui->setTestSession($testSession);
             $gui->setTestResults($testResults);
             $this->ctrl->forwardCommand($gui);
             break;
         case 'ilobjectcopygui':
             $this->prepareOutput();
             $this->addHeaderAction();
             require_once './Services/Object/classes/class.ilObjectCopyGUI.php';
             $cp = new ilObjectCopyGUI($this);
             $cp->setType('tst');
             $this->ctrl->forwardCommand($cp);
             break;
         case 'ilrepositorysearchgui':
             $this->prepareOutput();
             $this->addHeaderAction();
             require_once './Services/Search/classes/class.ilRepositorySearchGUI.php';
             $rep_search =& new ilRepositorySearchGUI();
             $rep_search->setCallback($this, 'addParticipantsObject', array());
             // Set tabs
             $this->ctrl->setReturn($this, 'participants');
             $ret =& $this->ctrl->forwardCommand($rep_search);
             $this->tabs_gui->setTabActive('participants');
             break;
         case 'ilpageeditorgui':
         case 'iltestexpresspageobjectgui':
             require_once 'Modules/TestQuestionPool/classes/class.ilAssIncompleteQuestionPurger.php';
             $incompleteQuestionPurger = new ilAssIncompleteQuestionPurger($ilDB);
             $incompleteQuestionPurger->setOwnerId($ilUser->getId());
             $incompleteQuestionPurger->purge();
             $qid = $_REQUEST['q_id'];
             // :FIXME: does not work
             // $this->ctrl->saveParameterByClass(array('iltestexpresspageobjectgui', 'assorderingquestiongui', 'ilpageeditorgui', 'ilpcquestion', 'ilpcquestiongui'), 'test_express_mode');
             if (!$qid || $qid == 'Array') {
                 $questions = $this->object->getQuestionTitlesAndIndexes();
                 if (!is_array($questions)) {
                     $questions = array();
                 }
                 $keys = array_keys($questions);
                 $qid = $keys[0];
                 $_REQUEST['q_id'] = $qid;
                 $_GET['q_id'] = $qid;
                 $_POST['q_id'] = $qid;
             }
             $this->prepareOutput();
             if (!in_array($cmd, array('addQuestion', 'browseForQuestions'))) {
                 $this->buildPageViewToolbar($qid);
             }
             if (!$qid || in_array($cmd, array('insertQuestions', 'browseForQuestions'))) {
                 require_once "./Modules/Test/classes/class.ilTestExpressPageObjectGUI.php";
                 $pageObject = new ilTestExpressPageObjectGUI(0);
                 $pageObject->test_object = $this->object;
                 $ret =& $this->ctrl->forwardCommand($pageObject);
                 break;
             }
             require_once "./Services/Style/classes/class.ilObjStyleSheet.php";
             $this->tpl->setCurrentBlock("ContentStyle");
             $this->tpl->setVariable("LOCATION_CONTENT_STYLESHEET", ilObjStyleSheet::getContentStylePath(0));
             $this->tpl->parseCurrentBlock();
             // syntax style
             $this->tpl->setCurrentBlock("SyntaxStyle");
             $this->tpl->setVariable("LOCATION_SYNTAX_STYLESHEET", ilObjStyleSheet::getSyntaxStylePath());
             $this->tpl->parseCurrentBlock();
             require_once "./Modules/TestQuestionPool/classes/class.assQuestionGUI.php";
             $q_gui = assQuestionGUI::_getQuestionGUI("", $qid);
             if (!$q_gui instanceof assQuestionGUI) {
                 $this->ctrl->setParameterByClass('iltestexpresspageobjectgui', 'q_id', '');
                 $this->ctrl->redirectByClass('iltestexpresspageobjectgui', $this->ctrl->getCmd());
             }
             $q_gui->outAdditionalOutput();
             $q_gui->object->setObjId($this->object->getId());
             $question = $q_gui->object;
             $this->ctrl->saveParameter($this, "q_id");
             #$this->lng->loadLanguageModule("content");
             $this->ctrl->setReturnByClass("ilTestExpressPageObjectGUI", "view");
             $this->ctrl->setReturn($this, "questions");
             require_once "./Modules/TestQuestionPool/classes/class.ilAssQuestionPage.php";
             require_once "./Modules/Test/classes/class.ilTestExpressPageObjectGUI.php";
             $page_gui = new ilTestExpressPageObjectGUI($qid);
             $page_gui->test_object = $this->object;
             $page_gui->setEditPreview(true);
             $page_gui->setEnabledTabs(false);
             if (strlen($this->ctrl->getCmd()) == 0) {
                 $this->ctrl->setCmdClass(get_class($page_gui));
                 $this->ctrl->setCmd("preview");
             }
             $page_gui->setQuestionHTML(array($q_gui->object->getId() => $q_gui->getPreview(TRUE)));
             $page_gui->setTemplateTargetVar("ADM_CONTENT");
             $page_gui->setOutputMode($this->object->evalTotalPersons() == 0 ? "edit" : 'preview');
             $page_gui->setHeader($question->getTitle());
             $page_gui->setFileDownloadLink($this->ctrl->getLinkTarget($this, "downloadFile"));
             $page_gui->setFullscreenLink($this->ctrl->getLinkTarget($this, "fullscreen"));
             $page_gui->setSourcecodeDownloadScript($this->ctrl->getLinkTarget($this));
             $page_gui->setPresentationTitle($question->getTitle() . ' [' . $this->lng->txt('question_id_short') . ': ' . $question->getId() . ']');
             $ret =& $this->ctrl->forwardCommand($page_gui);
             global $ilTabs;
             $ilTabs->activateTab('assQuestions');
             $this->tpl->setContent($ret);
             break;
         case 'ilassquestionpreviewgui':
             $this->prepareOutput();
             $this->ctrl->saveParameter($this, "q_id");
             require_once 'Modules/TestQuestionPool/classes/class.ilAssQuestionPreviewGUI.php';
             $gui = new ilAssQuestionPreviewGUI($this->ctrl, $this->tabs_gui, $this->tpl, $this->lng, $ilDB);
             $gui->initQuestion((int) $_GET['q_id'], $this->object->getId());
             $gui->initPreviewSettings($this->object->getRefId());
             $gui->initPreviewSession($ilUser->getId(), (int) $_GET['q_id']);
             $gui->initHintTracking();
             $gui->initStyleSheets();
             $this->ctrl->forwardCommand($gui);
             break;
         case 'ilassquestionpagegui':
             require_once "./Modules/TestQuestionPool/classes/class.ilAssQuestionPageGUI.php";
             //echo $_REQUEST['prev_qid'];
             if ($_REQUEST['prev_qid']) {
                 $this->ctrl->setParameter($this, 'prev_qid', $_REQUEST['prev_qid']);
             }
             $this->prepareOutput();
             //global $___test_express_mode;
             //$___test_express_mode = true;
             $_GET['calling_test'] = $this->object->getRefId();
             include_once "./Services/Style/classes/class.ilObjStyleSheet.php";
             $this->tpl->setCurrentBlock("ContentStyle");
             $this->tpl->setVariable("LOCATION_CONTENT_STYLESHEET", ilObjStyleSheet::getContentStylePath(0));
             $this->tpl->parseCurrentBlock();
             // syntax style
             $this->tpl->setCurrentBlock("SyntaxStyle");
             $this->tpl->setVariable("LOCATION_SYNTAX_STYLESHEET", ilObjStyleSheet::getSyntaxStylePath());
             $this->tpl->parseCurrentBlock();
             require_once "./Modules/TestQuestionPool/classes/class.assQuestionGUI.php";
             $q_gui = assQuestionGUI::_getQuestionGUI("", $_GET["q_id"]);
             $q_gui->setQuestionTabs();
             $q_gui->outAdditionalOutput();
             $q_gui->object->setObjId($this->object->getId());
             $question =& $q_gui->object;
             $this->ctrl->saveParameter($this, "q_id");
             $this->lng->loadLanguageModule("content");
             $this->ctrl->setReturnByClass("ilAssQuestionPageGUI", "view");
             $this->ctrl->setReturn($this, "questions");
             $page_gui = new ilAssQuestionPageGUI($_GET["q_id"]);
             $page_gui->setEditPreview(true);
             if (strlen($this->ctrl->getCmd()) == 0) {
                 $this->ctrl->setCmdClass(get_class($page_gui));
                 $this->ctrl->setCmd("preview");
             }
             $page_gui->setQuestionHTML(array($q_gui->object->getId() => $q_gui->getPreview(TRUE)));
             $page_gui->setTemplateTargetVar("ADM_CONTENT");
             $page_gui->setOutputMode($this->object->evalTotalPersons() == 0 ? "edit" : 'preview');
             $page_gui->setHeader($question->getTitle());
             $page_gui->setPresentationTitle($question->getTitle() . ' [' . $this->lng->txt('question_id_short') . ': ' . $question->getId() . ']');
             $ret =& $this->ctrl->forwardCommand($page_gui);
             $this->tpl->setContent($ret);
             break;
         case 'ilassspecfeedbackpagegui':
             require_once "./Modules/TestQuestionPool/classes/feedback/class.ilAssSpecFeedbackPageGUI.php";
             $pg_gui = new ilAssSpecFeedbackPageGUI((int) $_GET["feedback_id"]);
             $this->ctrl->forwardCommand($pg_gui);
             break;
         case 'ilassgenfeedbackpagegui':
             require_once "./Modules/TestQuestionPool/classes/feedback/class.ilAssGenFeedbackPageGUI.php";
             $pg_gui = new ilAssGenFeedbackPageGUI((int) $_GET["feedback_id"]);
             $this->ctrl->forwardCommand($pg_gui);
             break;
         case 'illocalunitconfigurationgui':
             $this->prepareSubGuiOutput();
             // set return target
             $this->ctrl->setReturn($this, "questions");
             // set context tabs
             require_once 'Modules/TestQuestionPool/classes/class.assQuestionGUI.php';
             $questionGUI = assQuestionGUI::_getQuestionGUI('', $_GET['q_id']);
             $questionGUI->object->setObjId($this->object->getId());
             $questionGUI->setQuestionTabs();
             require_once 'Modules/TestQuestionPool/classes/class.ilLocalUnitConfigurationGUI.php';
             require_once 'Modules/TestQuestionPool/classes/class.ilUnitConfigurationRepository.php';
             $gui = new ilLocalUnitConfigurationGUI(new ilUnitConfigurationRepository((int) $_GET['q_id']));
             $this->ctrl->forwardCommand($gui);
             break;
         case "ilcommonactiondispatchergui":
             require_once "Services/Object/classes/class.ilCommonActionDispatcherGUI.php";
             $gui = ilCommonActionDispatcherGUI::getInstanceFromAjaxCall();
             $this->ctrl->forwardCommand($gui);
             break;
         case 'ilassquestionhintsgui':
             $this->prepareSubGuiOutput();
             // set return target
             $this->ctrl->setReturn($this, "questions");
             // set context tabs
             require_once 'Modules/TestQuestionPool/classes/class.assQuestionGUI.php';
             $questionGUI =& assQuestionGUI::_getQuestionGUI($q_type, $_GET['q_id']);
             $questionGUI->object->setObjId($this->object->getId());
             $questionGUI->setQuestionTabs();
             // forward to ilAssQuestionHintsGUI
             require_once 'Modules/TestQuestionPool/classes/class.ilAssQuestionHintsGUI.php';
             $gui = new ilAssQuestionHintsGUI($questionGUI);
             $ilCtrl->forwardCommand($gui);
             break;
         case 'ilassquestionfeedbackeditinggui':
             $this->prepareSubGuiOutput();
             // set return target
             $this->ctrl->setReturn($this, "questions");
             // set context tabs
             require_once 'Modules/TestQuestionPool/classes/class.assQuestionGUI.php';
             $questionGUI = assQuestionGUI::_getQuestionGUI('', $_GET['q_id']);
             $questionGUI->object->setObjId($this->object->getId());
             $questionGUI->setQuestionTabs();
             // forward to ilAssQuestionFeedbackGUI
             require_once 'Modules/TestQuestionPool/classes/class.ilAssQuestionFeedbackEditingGUI.php';
             $gui = new ilAssQuestionFeedbackEditingGUI($questionGUI, $ilCtrl, $ilAccess, $tpl, $ilTabs, $lng);
             $ilCtrl->forwardCommand($gui);
             break;
         case 'iltesttoplistgui':
             $this->prepareOutput();
             require_once './Modules/Test/classes/class.ilTestToplistGUI.php';
             $gui = new ilTestToplistGUI($this);
             $this->ctrl->forwardCommand($gui);
             break;
         case 'ilscoringadjustmentgui':
             $this->prepareOutput();
             require_once './Modules/Test/classes/class.ilScoringAdjustmentGUI.php';
             $gui = new ilScoringAdjustmentGUI($this->object);
             $this->ctrl->forwardCommand($gui);
             break;
         case '':
         case 'ilobjtestgui':
             $this->prepareOutput();
             $this->addHeaderAction();
             if (strcmp($cmd, "properties") == 0 && $_GET["browse"]) {
                 $this->questionBrowser();
                 return;
             }
             if (strcmp($cmd, "properties") == 0 && ($_GET["up"] || $_GET["down"])) {
                 $this->questionsObject();
                 return;
             }
             $cmd .= "Object";
             $ret =& $this->{$cmd}();
             break;
         default:
             // elba hack for storing question id for inserting new question after
             if ($_REQUEST['prev_qid']) {
                 global $___prev_question_id;
                 $___prev_question_id = $_REQUEST['prev_qid'];
                 $this->ctrl->setParameterByClass('ilassquestionpagegui', 'prev_qid', $_REQUEST['prev_qid']);
                 $this->ctrl->setParameterByClass($_GET['sel_question_types'] . 'gui', 'prev_qid', $_REQUEST['prev_qid']);
             }
             $this->create_question_mode = true;
             $this->prepareOutput();
             $this->ctrl->setReturn($this, "questions");
             require_once "./Modules/TestQuestionPool/classes/class.assQuestionGUI.php";
             $q_gui =& assQuestionGUI::_getQuestionGUI($_GET['sel_question_types'], $_GET["q_id"]);
             $q_gui->object->setObjId($this->object->getId());
             if (!$_GET['sel_question_types']) {
                 $qType = assQuestion::getQuestionTypeFromDb($_GET['q_id']);
             } else {
                 $qType = $_GET['sel_question_types'];
             }
             $this->ctrl->setParameterByClass($qType . "GUI", 'prev_qid', $_REQUEST['prev_qid']);
             $this->ctrl->setParameterByClass($qType . "GUI", 'test_ref_id', $_REQUEST['ref_id']);
             $this->ctrl->setParameterByClass($qType . "GUI", 'q_id', $_REQUEST['q_id']);
             if ($_REQUEST['test_express_mode']) {
                 $this->ctrl->setParameterByClass($qType . "GUI", 'test_express_mode', 1);
             }
             #global $___test_express_mode;
             #$___test_express_mode = true;
             if (!$q_gui->isSaveCommand()) {
                 $_GET['calling_test'] = $this->object->getRefId();
             }
             $q_gui->setQuestionTabs();
             #unset($___test_express_mode);
             $ret =& $this->ctrl->forwardCommand($q_gui);
             break;
     }
     if (!in_array(strtolower($_GET["baseClass"]), array('iladministrationgui', 'ilrepositorygui')) && $this->getCreationMode() != true) {
         $this->tpl->show();
     }
 }
 /**
  * @deprecated
  */
 function _getGUIClassNameForId($a_q_id)
 {
     include_once "./Modules/TestQuestionPool/classes/class.assQuestion.php";
     include_once "./Modules/TestQuestionPool/classes/class.assQuestionGUI.php";
     $q_type = assQuestion::getQuestionTypeFromDb($a_q_id);
     $class_name = assQuestionGUI::_getClassNameForQType($q_type);
     return $class_name;
 }
 /**
  * execute command
  */
 function executeCommand()
 {
     global $ilAccess, $ilNavigationHistory, $ilCtrl, $ilErr;
     if (!$ilAccess->checkAccess("read", "", $_GET["ref_id"]) && !$ilAccess->checkAccess("visible", "", $_GET["ref_id"])) {
         global $ilias;
         $ilias->raiseError($this->lng->txt("permission_denied"), $ilias->error_obj->MESSAGE);
     }
     $cmd = $this->ctrl->getCmd("properties");
     $cmdsDisabledDueToOfflineStatus = array('resume', 'start', 'outUserResultsOverview', 'outUserListOfAnswerPasses');
     if (!$this->getCreationMode() && !$this->object->isOnline() && in_array($cmd, $cmdsDisabledDueToOfflineStatus)) {
         $cmd = 'infoScreen';
     }
     $next_class = $this->ctrl->getNextClass($this);
     $this->ctrl->setReturn($this, "properties");
     if (method_exists($this->object, "getTestStyleLocation")) {
         $this->tpl->addCss($this->object->getTestStyleLocation("output"), "screen");
     }
     // add entry to navigation history
     if (!$this->getCreationMode() && $ilAccess->checkAccess("read", "", $_GET["ref_id"])) {
         $ilNavigationHistory->addItem($_GET["ref_id"], "ilias.php?baseClass=ilObjTestGUI&cmd=infoScreen&ref_id=" . $_GET["ref_id"], "tst");
     }
     if (!$this->getCreationMode()) {
         if (IS_PAYMENT_ENABLED) {
             include_once 'Services/Payment/classes/class.ilPaymentObject.php';
             if (ilPaymentObject::_requiresPurchaseToAccess($this->object->getRefId(), $type = isset($_GET['purchasetype']) ? $_GET['purchasetype'] : NULL)) {
                 $this->setLocator();
                 $this->tpl->getStandardTemplate();
                 include_once 'Services/Payment/classes/class.ilShopPurchaseGUI.php';
                 $pp = new ilShopPurchaseGUI((int) $_GET['ref_id']);
                 $ret = $this->ctrl->forwardCommand($pp);
                 $this->tpl->show();
                 exit;
             }
         }
     }
     // elba hack for storing question id for inserting new question after
     if ($_REQUEST['prev_qid']) {
         global $___prev_question_id;
         $___prev_question_id = $_REQUEST['prev_qid'];
         $this->ctrl->setParameter($this, 'prev_qid', $_REQUEST['prev_qid']);
     }
     switch ($next_class) {
         case "ilinfoscreengui":
             $this->prepareOutput();
             $this->addHeaderAction();
             $this->infoScreen();
             // forwards command
             break;
         case 'ilmdeditorgui':
             if (!$ilAccess->checkAccess('write', '', $this->object->getRefId())) {
                 $ilErr->raiseError($this->lng->txt('permission_denied'), $ilErr->WARNING);
             }
             $this->prepareOutput();
             $this->addHeaderAction();
             include_once 'Services/MetaData/classes/class.ilMDEditorGUI.php';
             $md_gui =& new ilMDEditorGUI($this->object->getId(), 0, $this->object->getType());
             $md_gui->addObserver($this->object, 'MDUpdateListener', 'General');
             $this->ctrl->forwardCommand($md_gui);
             break;
         case "iltestoutputgui":
             include_once "./Modules/Test/classes/class.ilTestOutputGUI.php";
             if (!$this->object->getKioskMode()) {
                 $this->prepareOutput();
             }
             $output_gui =& new ilTestOutputGUI($this->object);
             $this->ctrl->forwardCommand($output_gui);
             break;
         case "iltestevaluationgui":
             $this->prepareOutput();
             $this->addHeaderAction();
             include_once "./Modules/Test/classes/class.ilTestEvaluationGUI.php";
             $evaluation_gui =& new ilTestEvaluationGUI($this->object);
             $this->ctrl->forwardCommand($evaluation_gui);
             break;
         case "iltestservicegui":
             $this->prepareOutput();
             $this->addHeaderAction();
             include_once "./Modules/Test/classes/class.ilTestServiceGUI.php";
             $serviceGUI =& new ilTestServiceGUI($this->object);
             $this->ctrl->forwardCommand($serviceGUI);
             break;
         case 'ilpermissiongui':
             $this->prepareOutput();
             $this->addHeaderAction();
             include_once "Services/AccessControl/classes/class.ilPermissionGUI.php";
             $perm_gui =& new ilPermissionGUI($this);
             $ret =& $this->ctrl->forwardCommand($perm_gui);
             break;
         case "illearningprogressgui":
             $this->prepareOutput();
             $this->addHeaderAction();
             include_once './Services/Tracking/classes/class.ilLearningProgressGUI.php';
             $new_gui =& new ilLearningProgressGUI(LP_MODE_REPOSITORY, $this->object->getRefId());
             $this->ctrl->forwardCommand($new_gui);
             break;
         case "ilcertificategui":
             $this->prepareOutput();
             $this->addHeaderAction();
             include_once "./Services/Certificate/classes/class.ilCertificateGUI.php";
             include_once "./Modules/Test/classes/class.ilTestCertificateAdapter.php";
             $output_gui = new ilCertificateGUI(new ilTestCertificateAdapter($this->object));
             $this->ctrl->forwardCommand($output_gui);
             break;
         case "iltestscoringgui":
             $this->prepareOutput();
             $this->addHeaderAction();
             include_once "./Modules/Test/classes/class.ilTestScoringGUI.php";
             $output_gui = new ilTestScoringGUI($this->object);
             $this->ctrl->forwardCommand($output_gui);
             break;
         case 'ilobjectcopygui':
             $this->prepareOutput();
             $this->addHeaderAction();
             include_once './Services/Object/classes/class.ilObjectCopyGUI.php';
             $cp = new ilObjectCopyGUI($this);
             $cp->setType('tst');
             $this->ctrl->forwardCommand($cp);
             break;
         case 'ilrepositorysearchgui':
             $this->prepareOutput();
             $this->addHeaderAction();
             include_once './Services/Search/classes/class.ilRepositorySearchGUI.php';
             $rep_search =& new ilRepositorySearchGUI();
             $rep_search->setCallback($this, 'addParticipantsObject', array());
             // Set tabs
             $this->ctrl->setReturn($this, 'participants');
             $ret =& $this->ctrl->forwardCommand($rep_search);
             $this->tabs_gui->setTabActive('participants');
             break;
         case 'ilpageeditorgui':
         case 'iltestexpresspageobjectgui':
             $qid = $_REQUEST['q_id'];
             // :FIXME: does not work
             // $this->ctrl->saveParameterByClass(array('iltestexpresspageobjectgui', 'assorderingquestiongui', 'ilpageeditorgui', 'ilpcquestion', 'ilpcquestiongui'), 'test_express_mode');
             if (!$qid || $qid == 'Array') {
                 $questions = $this->object->getQuestionTitlesAndIndexes();
                 if (!is_array($questions)) {
                     $questions = array();
                 }
                 $keys = array_keys($questions);
                 $qid = $keys[0];
                 $_REQUEST['q_id'] = $qid;
                 $_GET['q_id'] = $qid;
                 $_POST['q_id'] = $qid;
             }
             $this->prepareOutput();
             if (!in_array($cmd, array('addQuestion', 'browseForQuestions'))) {
                 $this->buildPageViewToolbar($qid);
             }
             if (!$qid || in_array($cmd, array('insertQuestions', 'browseForQuestions'))) {
                 include_once "./Modules/Test/classes/class.ilTestExpressPageObjectGUI.php";
                 $pageObject = new ilTestExpressPageObjectGUI("qpl", 0);
                 $pageObject->test_object = $this->object;
                 $ret =& $this->ctrl->forwardCommand($pageObject);
                 break;
             }
             include_once "./Services/Style/classes/class.ilObjStyleSheet.php";
             $this->tpl->setCurrentBlock("ContentStyle");
             $this->tpl->setVariable("LOCATION_CONTENT_STYLESHEET", ilObjStyleSheet::getContentStylePath(0));
             $this->tpl->parseCurrentBlock();
             // syntax style
             $this->tpl->setCurrentBlock("SyntaxStyle");
             $this->tpl->setVariable("LOCATION_SYNTAX_STYLESHEET", ilObjStyleSheet::getSyntaxStylePath());
             $this->tpl->parseCurrentBlock();
             include_once "./Modules/TestQuestionPool/classes/class.assQuestionGUI.php";
             $q_gui =& assQuestionGUI::_getQuestionGUI("", $qid);
             $q_gui->outAdditionalOutput();
             $q_gui->object->setObjId($this->object->getId());
             $question =& $q_gui->object;
             $this->ctrl->saveParameter($this, "q_id");
             #$this->lng->loadLanguageModule("content");
             $this->ctrl->setReturnByClass("ilTestExpressPageObjectGUI", "view");
             $this->ctrl->setReturn($this, "questions");
             //$page =& new ilPageObject("qpl", $_GET["q_id"]);
             include_once "./Services/COPage/classes/class.ilPageObject.php";
             include_once "./Modules/Test/classes/class.ilTestExpressPageObjectGUI.php";
             $page_gui =& new ilTestExpressPageObjectGUI("qpl", $qid);
             $page_gui->test_object = $this->object;
             $page_gui->setEditPreview(true);
             $page_gui->setEnabledTabs(false);
             $page_gui->setEnabledInternalLinks(false);
             if (strlen($this->ctrl->getCmd()) == 0) {
                 $this->ctrl->setCmdClass(get_class($page_gui));
                 $this->ctrl->setCmd("preview");
             }
             $page_gui->setQuestionHTML(array($q_gui->object->getId() => $q_gui->getPreview(TRUE)));
             $page_gui->setTemplateTargetVar("ADM_CONTENT");
             $page_gui->setOutputMode($this->object->evalTotalPersons() == 0 ? "edit" : 'preview');
             $page_gui->setHeader($question->getTitle());
             $page_gui->setFileDownloadLink($this->ctrl->getLinkTarget($this, "downloadFile"));
             $page_gui->setFullscreenLink($this->ctrl->getLinkTarget($this, "fullscreen"));
             $page_gui->setSourcecodeDownloadScript($this->ctrl->getLinkTarget($this));
             $page_gui->setPresentationTitle($question->getTitle());
             $ret =& $this->ctrl->forwardCommand($page_gui);
             global $ilTabs;
             $ilTabs->activateTab('assQuestions');
             $this->tpl->setContent($ret);
             break;
         case 'ilpageobjectgui':
             include_once "./Services/COPage/classes/class.ilPageObjectGUI.php";
             //echo $_REQUEST['prev_qid'];
             if ($_REQUEST['prev_qid']) {
                 $this->ctrl->setParameter($this, 'prev_qid', $_REQUEST['prev_qid']);
             }
             $this->prepareOutput();
             //global $___test_express_mode;
             //$___test_express_mode = true;
             $_GET['calling_test'] = $this->object->getRefId();
             include_once "./Services/Style/classes/class.ilObjStyleSheet.php";
             $this->tpl->setCurrentBlock("ContentStyle");
             $this->tpl->setVariable("LOCATION_CONTENT_STYLESHEET", ilObjStyleSheet::getContentStylePath(0));
             $this->tpl->parseCurrentBlock();
             // syntax style
             $this->tpl->setCurrentBlock("SyntaxStyle");
             $this->tpl->setVariable("LOCATION_SYNTAX_STYLESHEET", ilObjStyleSheet::getSyntaxStylePath());
             $this->tpl->parseCurrentBlock();
             include_once "./Modules/TestQuestionPool/classes/class.assQuestionGUI.php";
             $q_gui =& assQuestionGUI::_getQuestionGUI("", $_GET["q_id"]);
             $q_gui->setQuestionTabs();
             $q_gui->outAdditionalOutput();
             $q_gui->object->setObjId($this->object->getId());
             $question =& $q_gui->object;
             $this->ctrl->saveParameter($this, "q_id");
             include_once "./Services/COPage/classes/class.ilPageObject.php";
             include_once "./Services/COPage/classes/class.ilPageObjectGUI.php";
             $this->lng->loadLanguageModule("content");
             $this->ctrl->setReturnByClass("ilPageObjectGUI", "view");
             $this->ctrl->setReturn($this, "questions");
             //$page =& new ilPageObject("qpl", $_GET["q_id"]);
             $page_gui =& new ilPageObjectGUI("qpl", $_GET["q_id"]);
             $page_gui->setEditPreview(true);
             $page_gui->setEnabledTabs(false);
             $page_gui->setEnabledInternalLinks(false);
             if (strlen($this->ctrl->getCmd()) == 0) {
                 $this->ctrl->setCmdClass(get_class($page_gui));
                 $this->ctrl->setCmd("preview");
             }
             //$page_gui->setQuestionXML($question->toXML(false, false, true));
             $page_gui->setQuestionHTML(array($q_gui->object->getId() => $q_gui->getPreview(TRUE)));
             $page_gui->setTemplateTargetVar("ADM_CONTENT");
             $page_gui->setOutputMode($this->object->evalTotalPersons() == 0 ? "edit" : 'preview');
             $page_gui->setHeader($question->getTitle());
             $page_gui->setFileDownloadLink($this->ctrl->getLinkTarget($this, "downloadFile"));
             $page_gui->setFullscreenLink($this->ctrl->getLinkTarget($this, "fullscreen"));
             $page_gui->setSourcecodeDownloadScript($this->ctrl->getLinkTarget($this));
             $page_gui->setPresentationTitle($question->getTitle());
             $ret =& $this->ctrl->forwardCommand($page_gui);
             $this->tpl->setContent($ret);
             break;
         case "ilcommonactiondispatchergui":
             include_once "Services/Object/classes/class.ilCommonActionDispatcherGUI.php";
             $gui = ilCommonActionDispatcherGUI::getInstanceFromAjaxCall();
             $this->ctrl->forwardCommand($gui);
             break;
         case 'ilassquestionhintsgui':
             $this->prepareSubGuiOutput();
             // set return target
             $this->ctrl->setReturn($this, "questions");
             // set context tabs
             require_once 'Modules/TestQuestionPool/classes/class.assQuestionGUI.php';
             $questionGUI =& assQuestionGUI::_getQuestionGUI($q_type, $_GET['q_id']);
             $questionGUI->object->setObjId($this->object->getId());
             $questionGUI->setQuestionTabs();
             // forward to ilAssQuestionHintsGUI
             require_once 'Modules/TestQuestionPool/classes/class.ilAssQuestionHintsGUI.php';
             $gui = new ilAssQuestionHintsGUI($questionGUI);
             $ilCtrl->forwardCommand($gui);
             break;
         case 'iltesttoplistgui':
             $this->prepareOutput();
             require_once 'Modules/Test/classes/class.ilTestToplistGUI.php';
             $gui = new ilTestToplistGUI($this);
             $this->ctrl->forwardCommand($gui);
             break;
         case '':
         case 'ilobjtestgui':
             $this->prepareOutput();
             $this->addHeaderAction();
             if (preg_match("/deleteqpl_\\d+/", $cmd)) {
                 $cmd = "randomQuestions";
             }
             if (strcmp($cmd, "properties") == 0 && $_GET["browse"]) {
                 $this->questionBrowser();
                 return;
             }
             if (strcmp($cmd, "properties") == 0 && ($_GET["up"] || $_GET["down"])) {
                 $this->questionsObject();
                 return;
             }
             $cmd .= "Object";
             $ret =& $this->{$cmd}();
             break;
         default:
             // elba hack for storing question id for inserting new question after
             if ($_REQUEST['prev_qid']) {
                 global $___prev_question_id;
                 $___prev_question_id = $_REQUEST['prev_qid'];
                 $this->ctrl->setParameterByClass('ilpageobjectgui', 'prev_qid', $_REQUEST['prev_qid']);
                 $this->ctrl->setParameterByClass($_GET['sel_question_types'] . 'gui', 'prev_qid', $_REQUEST['prev_qid']);
             }
             $this->create_question_mode = true;
             $this->prepareOutput();
             $this->ctrl->setReturn($this, "questions");
             include_once "./Modules/TestQuestionPool/classes/class.assQuestionGUI.php";
             $q_gui =& assQuestionGUI::_getQuestionGUI($_GET['sel_question_types'], $_GET["q_id"]);
             $q_gui->object->setObjId($this->object->getId());
             if (!$_GET['sel_question_types']) {
                 $qType = assQuestion::getQuestionTypeFromDb($_GET['q_id']);
             } else {
                 $qType = $_GET['sel_question_types'];
             }
             $this->ctrl->setParameterByClass($qType . "GUI", 'prev_qid', $_REQUEST['prev_qid']);
             $this->ctrl->setParameterByClass($qType . "GUI", 'test_ref_id', $_REQUEST['ref_id']);
             $this->ctrl->setParameterByClass($qType . "GUI", 'q_id', $_REQUEST['q_id']);
             if ($_REQUEST['test_express_mode']) {
                 $this->ctrl->setParameterByClass($qType . "GUI", 'test_express_mode', 1);
             }
             #global $___test_express_mode;
             #$___test_express_mode = true;
             if (!$q_gui->isSaveCommand()) {
                 $_GET['calling_test'] = $this->object->getRefId();
             }
             $q_gui->setQuestionTabs();
             #unset($___test_express_mode);
             $ret =& $this->ctrl->forwardCommand($q_gui);
             break;
     }
     if (strtolower($_GET["baseClass"]) != "iladministrationgui" && $this->getCreationMode() != true) {
         $this->tpl->show();
     }
 }