class.assQuestionGUI.php

Go to the documentation of this file.

<?php
/* Copyright (c) 1998-2013 ILIAS open source, Extended GPL, see docs/LICENSE */

require_once './Modules/Test/classes/inc.AssessmentConstants.php';
require_once 'Modules/Test/classes/class.ilTestExpressPage.php';
require_once 'Modules/TestQuestionPool/exceptions/class.ilTestQuestionPoolException.php';
require_once 'Modules/Test/classes/class.ilTestExpressPage.php';
require_once 'Modules/Test/classes/class.ilObjAssessmentFolder.php';

abstract class assQuestionGUI
{
        const FORM_MODE_EDIT    = 'edit';
        const FORM_MODE_ADJUST  = 'adjust';
        
        const FORM_ENCODING_URLENCODE = 'application/x-www-form-urlencoded';
        const FORM_ENCODING_MULTIPART = 'multipart/form-data';
        
        const SESSION_PREVIEW_DATA_BASE_INDEX = 'ilAssQuestionPreviewAnswers';
        
        var $object;

        var $tpl;
        var $lng;
        var $error;
        var $errormessage;
        
        var $sequence_no;
        var $question_count;
        
        private $taxonomyIds = array();
        
        private $targetGuiClass = null;

        private $questionActionCmd = 'handleQuestionAction';

        private $questionHeaderBlockBuilder;

        private $navigationGUI;

        const PRESENTATION_CONTEXT_TEST = 'pContextTest';
        const PRESENTATION_CONTEXT_RESULTS = 'pContextResults';

        private $presentationContext = null;

        const RENDER_PURPOSE_PLAYBACK = 'renderPurposePlayback';
        const RENDER_PURPOSE_DEMOPLAY = 'renderPurposeDemoplay';
        const RENDER_PURPOSE_PREVIEW = 'renderPurposePreview';
        const RENDER_PURPOSE_PRINT_PDF = 'renderPurposePrintPdf';
        const RENDER_PURPOSE_INPUT_VALUE = 'renderPurposeInputValue';
        
        private $renderPurpose = self::RENDER_PURPOSE_PLAYBACK;

        const EDIT_CONTEXT_AUTHORING = 'authoring';
        const EDIT_CONTEXT_ADJUSTMENT = 'adjustment';
        
        private $editContext = self::EDIT_CONTEXT_AUTHORING;
        
        protected $editForm;

        function __construct()
        {
                global $lng, $tpl, $ilCtrl;

                $this->lng =& $lng;
                $this->tpl =& $tpl;
                $this->ctrl =& $ilCtrl;
                $this->ctrl->saveParameter($this, "q_id");
                $this->ctrl->saveParameter($this, "prev_qid");
                $this->ctrl->saveParameter($this, "calling_test");
                $this->ctrl->saveParameter($this, "calling_consumer");
                $this->ctrl->saveParameter($this, "consumer_context");
                $this->ctrl->saveParameterByClass('ilAssQuestionPageGUI', 'test_express_mode');
                $this->ctrl->saveParameterByClass('ilAssQuestionPageGUI', 'calling_consumer');
                $this->ctrl->saveParameterByClass('ilAssQuestionPageGUI', 'consumer_context');
                $this->ctrl->saveParameterByClass('ilobjquestionpoolgui', 'test_express_mode');
                $this->ctrl->saveParameterByClass('ilobjquestionpoolgui', 'calling_consumer');
                $this->ctrl->saveParameterByClass('ilobjquestionpoolgui', 'consumer_context');

                include_once "./Modules/TestQuestionPool/classes/class.assQuestion.php";
                $this->errormessage = $this->lng->txt("fill_out_all_required_fields");
                
                $this->selfassessmenteditingmode = false;
                $this->new_id_listeners = array();
                $this->new_id_listener_cnt = 0;
                
                $this->navigationGUI = null;
        }

        function executeCommand()
        {
                global $DIC; /* @var \ILIAS\DI\Container $DIC */
                $ilHelp = $DIC['ilHelp']; /* @var ilHelpGUI $ilHelp */
                $ilHelp->setScreenIdComponent('qpl');

                $cmd = $this->ctrl->getCmd("editQuestion");
                $next_class = $this->ctrl->getNextClass($this);

                $cmd = $this->getCommand($cmd);

                switch($next_class)
                {
                        case 'ilformpropertydispatchgui':
                                $form = $this->buildEditForm();

                                require_once 'Services/Form/classes/class.ilFormPropertyDispatchGUI.php';
                                $form_prop_dispatch = new ilFormPropertyDispatchGUI();
                                $form_prop_dispatch->setItem($form->getItemByPostVar(ilUtil::stripSlashes($_GET['postvar'])));
                                return $this->ctrl->forwardCommand($form_prop_dispatch);
                                break;

                        default:
                                $ret = $this->$cmd();
                                break;
                }
                return $ret;
        }

        function getCommand($cmd)
        {
                return $cmd;
        }

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

        public function getPresentationContext()
        {
                return $this->presentationContext;
        }

        public function setPresentationContext($presentationContext)
        {
                $this->presentationContext = $presentationContext;
        }
        
        public function isTestPresentationContext()
        {
                return $this->getPresentationContext() == self::PRESENTATION_CONTEXT_TEST;
        }

        public function getRenderPurpose()
        {
                return $this->renderPurpose;
        }

        public function setRenderPurpose($renderPurpose)
        {
                $this->renderPurpose = $renderPurpose;
        }
        
        public function isRenderPurposePrintPdf()
        {
                return $this->getRenderPurpose() == self::RENDER_PURPOSE_PRINT_PDF;
        }
        
        public function isRenderPurposePreview()
        {
                return $this->getRenderPurpose() == self::RENDER_PURPOSE_PREVIEW;
        }
        
        public function isRenderPurposeInputValue()
        {
                return $this->getRenderPurpose() == self::RENDER_PURPOSE_INPUT_VALUE;
        }
        
        public function isRenderPurposePlayback()
        {
                return $this->getRenderPurpose() == self::RENDER_PURPOSE_PLAYBACK;
        }
        
        public function isRenderPurposeDemoplay()
        {
                return $this->getRenderPurpose() == self::RENDER_PURPOSE_DEMOPLAY;
        }
        
        public function renderPurposeSupportsFormHtml()
        {
                if( $this->isRenderPurposePrintPdf() )
                {
                        return false;
                }
                
                if( $this->isRenderPurposeInputValue() )
                {
                        return false;
                }
                
                return true;
        }
        
        public function getEditContext()
        {
                return $this->editContext;
        }
        
        public function setEditContext($editContext)
        {
                $this->editContext = $editContext;
        }
        
        public function isAuthoringEditContext()
        {
                return $this->getEditContext() == self::EDIT_CONTEXT_AUTHORING;
        }
        
        public function isAdjustmentEditContext()
        {
                return $this->getEditContext() == self::EDIT_CONTEXT_ADJUSTMENT;
        }
        
        public function setAdjustmentEditContext()
        {
                return $this->setEditContext(self::EDIT_CONTEXT_ADJUSTMENT);
        }
        
        public function getNavigationGUI()
        {
                return $this->navigationGUI;
        }

        public function setNavigationGUI($navigationGUI)
        {
                $this->navigationGUI = $navigationGUI;
        }
        
        public function setTaxonomyIds($taxonomyIds)
        {
                $this->taxonomyIds = $taxonomyIds;
        }
        
        public function getTaxonomyIds()
        {
                return $this->taxonomyIds;
        }
        
        public function setTargetGui($linkTargetGui)
        {
                $this->setTargetGuiClass( get_class($linkTargetGui) );
        }
        
        public function setTargetGuiClass($targetGuiClass)
        {
                $this->targetGuiClass = $targetGuiClass;
        }
        
        public function getTargetGuiClass()
        {
                return $this->targetGuiClass;
        }

        public function setQuestionHeaderBlockBuilder($questionHeaderBlockBuilder)
        {
                $this->questionHeaderBlockBuilder = $questionHeaderBlockBuilder;
        }

// fau: testNav - get the question header block bulder (for tweaking)
        public function getQuestionHeaderBlockBuilder()
        {
                return $this->questionHeaderBlockBuilder;
        }
// fau.

        public function setQuestionActionCmd($questionActionCmd)
        {
                $this->questionActionCmd = $questionActionCmd;

                if( is_object($this->object) )
                {
                        $this->object->questionActionCmd = $questionActionCmd;
                }
        }

        public function getQuestionActionCmd()
        {
                return $this->questionActionCmd;
        }

        protected function writePostData($always = false)
        {
        }

        public function assessment()
        {
                global $tpl;

                require_once 'Modules/TestQuestionPool/classes/tables/class.ilQuestionCumulatedStatisticsTableGUI.php';
                $stats_table = new ilQuestionCumulatedStatisticsTableGUI($this, 'assessment', '', $this->object);

                require_once 'Modules/TestQuestionPool/classes/tables/class.ilQuestionUsagesTableGUI.php';
                $usage_table = new ilQuestionUsagesTableGUI($this, 'assessment', '', $this->object);

                $tpl->setContent(implode('<br />',  array(
                        $stats_table->getHTML(),
                        $usage_table->getHTML()
                )));
        }

        public static function _getQuestionGUI($question_type, $question_id = -1)
        {
                global $ilCtrl, $ilDB, $lng;
                
                include_once "./Modules/TestQuestionPool/classes/class.assQuestion.php";
                
                if ((!$question_type) and ($question_id > 0))
                {
                        $question_type = assQuestion::getQuestionTypeFromDb($question_id);
                }
                
                if (strlen($question_type) == 0) return NULL;

                assQuestion::_includeClass($question_type, 1);

                $question_type_gui = assQuestion::getGuiClassNameByQuestionType($question_type);
                $question = new $question_type_gui();

                $feedbackObjectClassname = assQuestion::getFeedbackClassNameByQuestionType($question_type);
                $question->object->feedbackOBJ = new $feedbackObjectClassname($question->object, $ilCtrl, $ilDB, $lng);
                
                if ($question_id > 0)
                {
                        $question->object->loadFromDb($question_id);
                }
                
                return $question;
        }

        public static 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;
        }

        public static function _getClassNameForQType($q_type)
        {
                return $q_type . "GUI";
        }

        function &createQuestionGUI($question_type, $question_id = -1)
        {
                include_once "./Modules/TestQuestionPool/classes/class.assQuestionGUI.php";
                $this->question =& assQuestionGUI::_getQuestionGUI($question_type, $question_id);
        }
        
        public function populateJavascriptFilesRequiredForWorkForm(ilTemplate $tpl)
        {
                $tpl->addJavaScript('Modules/TestQuestionPool/js/ilAssMultipleChoice.js');
        }

        public function getQuestionTemplate()
        {
                // @todo Björn: Maybe this has to be changed for PHP 7/ILIAS 5.2.x (ilObjTestGUI::executeCommand, switch -> default case -> $this->prepareOutput(); already added a template to the CONTENT variable wrapped in a block named content)
                if(!$this->tpl->blockExists('content'))
                {
                        $this->tpl->addBlockFile("CONTENT", "content", "tpl.il_as_qpl_content.html", "Modules/TestQuestionPool");
                }
                // @todo Björn: Maybe this has to be changed for PHP 7/ILIAS 5.2.x (ilObjTestGUI::executeCommand, switch -> default case -> $this->prepareOutput(); already added a template to the STATUSLINE variable wrapped in a block named statusline)
                if(!$this->tpl->blockExists('statusline'))
                {
                        $this->tpl->addBlockFile("STATUSLINE", "statusline", "tpl.statusline.html");
                }
                // @todo Björn: Maybe this has to be changed for PHP 7/ILIAS 5.2.x because ass[XYZ]QuestionGUI::editQuestion is called multiple times
                if(!$this->tpl->blockExists('adm_content'))
                {
                        $this->tpl->addBlockFile("ADM_CONTENT", "adm_content", "tpl.il_as_question.html", "Modules/TestQuestionPool");
                }
        }
        
        protected function renderEditForm($form)
        {
                $this->getQuestionTemplate();
                $this->tpl->setVariable("QUESTION_DATA", $form->getHTML());
        }

        function getILIASPage($html = "")
        {
                include_once("./Modules/TestQuestionPool/classes/class.ilAssQuestionPageGUI.php");
                $page_gui = new ilAssQuestionPageGUI($this->object->getId());
                $page_gui->setQuestionHTML(array($this->object->getId() => $html));
                $page_gui->setOutputMode("presentation");
                $presentation = $page_gui->presentation();
                $presentation = preg_replace("/src=\"\\.\\//ims", "src=\"" . ILIAS_HTTP_PATH . "/", $presentation);
                return $presentation;
        }

        function outQuestionPage($a_temp_var, $a_postponed = false, $active_id = "", $html = "")
        {
                // hey: prevPassSolutions - add the "use previous answer"
                // hey: prevPassSolutions - refactored identifiers
                if( $this->object->getTestPresentationConfig()->isSolutionInitiallyPrefilled() )
                // hey
                {
                        ilUtil::sendInfo($this->getPreviousSolutionProvidedMessage());
                        $html .= $this->getPreviousSolutionConfirmationCheckboxHtml();
                }
                else /* if( ...->isUnchangedAnswerPossible() ) --> */
                // hey.
// fau: testNav - add the "use unchanged answer checkbox"
                // hey: prevPassSolutions - refactored identifiers
                if ($this->object->getTestPresentationConfig()->isUnchangedAnswerPossible())
                // hey.
                {
                        $html .= $this->getUseUnchangedAnswerCheckboxHtml();
                }
// fau.

                $this->lng->loadLanguageModule("content");

// fau: testNav - add question buttons below question, add actions menu
                include_once("./Modules/TestQuestionPool/classes/class.ilAssQuestionPageGUI.php");
                $page_gui = new ilAssQuestionPageGUI($this->object->getId());
                $page_gui->setOutputMode("presentation");
                $page_gui->setTemplateTargetVar($a_temp_var);

                if( $this->getNavigationGUI() )
                {
                        $html .= $this->getNavigationGUI()->getHTML();
                        $page_gui->setQuestionActionsHTML($this->getNavigationGUI()->getActionsHTML());
                }
// fau.

                if( strlen($html) )
                {
                        $page_gui->setQuestionHTML(array($this->object->getId() => $html));
                }

// fau: testNav - fill the header with subtitle blocks for question info an actions
                $page_gui->setPresentationTitle($this->questionHeaderBlockBuilder->getPresentationTitle());
                $page_gui->setQuestionInfoHTML($this->questionHeaderBlockBuilder->getQuestionInfoHTML());
// fau.

                return $page_gui->presentation();
        }
        
// fau: testNav - get the html of the "use unchanged answer checkbox"
        private function getUseUnchangedAnswerCheckboxHtml()
        {
                // hey: prevPassSolutions - use abstracted template to share with other purposes of this kind
                $tpl = new ilTemplate('tpl.tst_question_additional_behaviour_checkbox.html', true, true, 'Modules/TestQuestionPool');
                $tpl->setVariable('TXT_FORCE_FORM_DIFF_LABEL', $this->object->getTestPresentationConfig()->getUseUnchangedAnswerLabel());
                // hey.
                return $tpl->get();
        }
// fau.

        // hey: prevPassSolutions - build prev solution message / build "use previous answer checkbox" html
        protected function getPreviousSolutionProvidedMessage()
        {
                return $this->lng->txt('use_previous_solution_advice');
        }
        
        protected function getPreviousSolutionConfirmationCheckboxHtml()
        {
                $tpl = new ilTemplate('tpl.tst_question_additional_behaviour_checkbox.html', true, true, 'Modules/TestQuestionPool');
                // hey: prevPassSolutions - use abtract template
                $tpl->setVariable('TXT_FORCE_FORM_DIFF_LABEL', $this->lng->txt('use_previous_solution'));
                // hey.
                return $tpl->get();
        }
        // hey.

        function cancel()
        {
                if ($_GET["calling_test"])
                {
                        $_GET["ref_id"] = $_GET["calling_test"];
                        ilUtil::redirect("ilias.php?baseClass=ilObjTestGUI&cmd=questions&ref_id=".$_GET["calling_test"]);
                }
                elseif ($_GET["test_ref_id"])
                {
                        $_GET["ref_id"] = $_GET["test_ref_id"];
                        ilUtil::redirect("ilias.php?baseClass=ilObjTestGUI&cmd=questions&ref_id=".$_GET["test_ref_id"]);
                }
                else
                {
                        if ($_GET["q_id"] > 0)
                        {
                                $this->ctrl->setParameterByClass("ilAssQuestionPageGUI", "q_id", $_GET["q_id"]);
                                $this->ctrl->redirectByClass("ilAssQuestionPageGUI", "edit");
                        }
                        else
                        {
                                $this->ctrl->redirectByClass("ilobjquestionpoolgui", "questions");
                        }
                }
        }

        function originalSyncForm($return_to = "", $return_to_feedback = '')
        {
                if (strlen($return_to))
                {
                        $this->ctrl->setParameter($this, "return_to", $return_to);
                }
                else if ($_REQUEST['return_to']) {
                        $this->ctrl->setParameter($this, "return_to", $_REQUEST['return_to']);
                }
                if(strlen($return_to_feedback))
                {
                        $this->ctrl->setParameter($this, 'return_to_fb', 'true');
                }

                $this->ctrl->saveParameter($this, 'test_express_mode');
                
                $template = new ilTemplate("tpl.il_as_qpl_sync_original.html",TRUE, TRUE, "Modules/TestQuestionPool");
                $template->setVariable("BUTTON_YES", $this->lng->txt("yes"));
                $template->setVariable("BUTTON_NO", $this->lng->txt("no"));
                $template->setVariable("FORM_ACTION", $this->ctrl->getFormAction($this));
                $template->setVariable("TEXT_SYNC", $this->lng->txt("confirm_sync_questions"));
                $this->tpl->setVariable("ADM_CONTENT", $template->get());
        }
        
        function sync()
        {
                $original_id = $this->object->original_id;
                if ($original_id)
                {
                        $this->object->syncWithOriginal();
                }
                if (strlen($_GET["return_to"]))
                {
                        $this->ctrl->redirect($this, $_GET["return_to"]);
                }
                if (strlen($_REQUEST["return_to_fb"]))
                {
                        $this->ctrl->redirectByClass('ilAssQuestionFeedbackEditingGUI', 'showFeedbackForm');
                }
                else
                {
                        if(isset($_GET['calling_consumer']) && (int)$_GET['calling_consumer'])
                        {
                                $ref_id = (int)$_GET['calling_consumer'];
                                $consumer = ilObjectFactory::getInstanceByRefId($ref_id);
                                if($consumer instanceof ilQuestionEditingFormConsumer)
                                {
                                        ilUtil::redirect($consumer->getQuestionEditingFormBackTarget($_GET['consumer_context']));
                                }
                                require_once 'Services/Link/classes/class.ilLink.php';
                                ilUtil::redirect(ilLink::_getLink($ref_id));
                        }
                        $_GET["ref_id"] = $_GET["calling_test"];
                        
                        if($_REQUEST['test_express_mode'])
                        {
                                ilUtil::redirect(ilTestExpressPage::getReturnToPageLink($this->object->getId()));
                        }
                        else
                        {
                                ilUtil::redirect("ilias.php?baseClass=ilObjTestGUI&cmd=questions&ref_id=".$_GET["calling_test"]);
                        }
                }
        }

        function cancelSync()
        {
                if (strlen($_GET["return_to"]))
                {
                        $this->ctrl->redirect($this, $_GET["return_to"]);
                }
                if(strlen($_REQUEST['return_to_fb']))
                {
                        $this->ctrl->redirectByClass('ilAssQuestionFeedbackEditingGUI', 'showFeedbackForm');
                }
                else
                {
                        if(isset($_GET['calling_consumer']) && (int)$_GET['calling_consumer'])
                        {
                                $ref_id = (int)$_GET['calling_consumer'];
                                $consumer = ilObjectFactory::getInstanceByRefId($ref_id);
                                if($consumer instanceof ilQuestionEditingFormConsumer)
                                {
                                        ilUtil::redirect($consumer->getQuestionEditingFormBackTarget($_GET['consumer_context']));
                                }
                                require_once 'Services/Link/classes/class.ilLink.php';
                                ilUtil::redirect(ilLink::_getLink($ref_id));
                        }
                        $_GET["ref_id"] = $_GET["calling_test"];

                        if($_REQUEST['test_express_mode'])
                        {
                                ilUtil::redirect(ilTestExpressPage::getReturnToPageLink($this->object->getId()));
                        }
                        else
                        {
                                ilUtil::redirect("ilias.php?baseClass=ilObjTestGUI&cmd=questions&ref_id=".$_GET["calling_test"]);
                        }
                }
        }
        
        function saveEdit()
        {
                global $ilUser;

                $result = $this->writePostData();
                if ($result == 0)
                {
                        $ilUser->setPref("tst_lastquestiontype", $this->object->getQuestionType());
                        $ilUser->writePref("tst_lastquestiontype", $this->object->getQuestionType());
                        $this->object->saveToDb();
                        $originalexists = $this->object->_questionExists($this->object->original_id);
                        include_once "./Modules/TestQuestionPool/classes/class.assQuestion.php";
                        if ($_GET["calling_test"] && $originalexists && assQuestion::_isWriteable($this->object->original_id, $ilUser->getId()))
                        {
                                $this->ctrl->redirect($this, "originalSyncForm");
                        }
                        elseif ($_GET["calling_test"])
                        {
                                $_GET["ref_id"] = $_GET["calling_test"];
                                ilUtil::redirect("ilias.php?baseClass=ilObjTestGUI&cmd=questions&ref_id=".$_GET["calling_test"]);
                                return;
                        }
                        elseif ($_GET["test_ref_id"])
                        {
                                global $tree, $ilDB, $ilPluginAdmin;
                                
                                include_once ("./Modules/Test/classes/class.ilObjTest.php");
                                $_GET["ref_id"] = $_GET["test_ref_id"];
                                $test = new ilObjTest($_GET["test_ref_id"], true);
                                
                                require_once 'Modules/Test/classes/class.ilTestQuestionSetConfigFactory.php';
                                $testQuestionSetConfigFactory = new ilTestQuestionSetConfigFactory($tree, $ilDB, $ilPluginAdmin, $test);

                                $test->insertQuestion( $testQuestionSetConfigFactory->getQuestionSetConfig(), $this->object->getId() );
                                
                                ilUtil::redirect("ilias.php?baseClass=ilObjTestGUI&cmd=questions&ref_id=".$_GET["test_ref_id"]);
                        }
                        else
                        {
                                $this->ctrl->setParameter($this, "q_id", $this->object->getId());
                                $this->editQuestion();
                                if (strcmp($_SESSION["info"], "") != 0)
                                {
                                        ilUtil::sendSuccess($_SESSION["info"] . "<br />" . $this->lng->txt("msg_obj_modified"), false);
                                }
                                else
                                {
                                        ilUtil::sendSuccess($this->lng->txt("msg_obj_modified"), false);
                                }
                                $this->ctrl->setParameterByClass("ilAssQuestionPageGUI", "q_id", $this->object->getId());
                                $this->ctrl->redirectByClass("ilAssQuestionPageGUI", "edit");
                        }
                }
        }

        function save()
        {
                global $ilUser;
                $old_id = $_GET["q_id"];
                $result = $this->writePostData();

                if($result == 0)
                {
                        $ilUser->setPref("tst_lastquestiontype", $this->object->getQuestionType());
                        $ilUser->writePref("tst_lastquestiontype", $this->object->getQuestionType());
                        $this->object->saveToDb();
                        $originalexists = $this->object->_questionExistsInPool($this->object->original_id);


                        include_once "./Modules/TestQuestionPool/classes/class.assQuestion.php";
                        if(($_GET["calling_test"] || (isset($_GET['calling_consumer']) && (int)$_GET['calling_consumer'])) && $originalexists && assQuestion::_isWriteable($this->object->original_id, $ilUser->getId()))
                        {
                                ilUtil::sendSuccess($this->lng->txt("msg_obj_modified"), true);
                                $this->ctrl->setParameter($this, 'return_to', 'editQuestion');
                                $this->ctrl->redirect($this, "originalSyncForm");
                                return;
                        }
                        elseif($_GET["calling_test"])
                        {
                                require_once 'Modules/Test/classes/class.ilObjTest.php';
                                $test = new ilObjTest($_GET["calling_test"]);
                                if(!assQuestion::_questionExistsInTest($this->object->getId(), $test->getTestId()))
                                {
                                        global $tree, $ilDB, $ilPluginAdmin;
                                        
                                        include_once("./Modules/Test/classes/class.ilObjTest.php");
                                        $_GET["ref_id"] = $_GET["calling_test"];
                                        $test = new ilObjTest($_GET["calling_test"], true);
                                        
                                        require_once 'Modules/Test/classes/class.ilTestQuestionSetConfigFactory.php';
                                        $testQuestionSetConfigFactory = new ilTestQuestionSetConfigFactory($tree, $ilDB, $ilPluginAdmin, $test);

                                        $new_id = $test->insertQuestion(
                                                        $testQuestionSetConfigFactory->getQuestionSetConfig(), $this->object->getId()
                                        );

                                        if(isset($_REQUEST['prev_qid']))
                                        {
                                                $test->moveQuestionAfter($this->object->getId() + 1, $_REQUEST['prev_qid']);
                                        }

                                        $this->ctrl->setParameter($this, 'q_id', $new_id);
                                        $this->ctrl->setParameter($this, 'calling_test', $_GET['calling_test']);
                                        #$this->ctrl->setParameter($this, 'test_ref_id', false);
                                }
                                ilUtil::sendSuccess($this->lng->txt("msg_obj_modified"), true);
                                $this->ctrl->redirect($this, 'editQuestion');

                        }
                        else
                        {
                                $this->callNewIdListeners($this->object->getId());

                                if($this->object->getId() != $old_id)
                                {
                                        // first save
                                        $this->ctrl->setParameterByClass($_GET["cmdClass"], "q_id", $this->object->getId());
                                        $this->ctrl->setParameterByClass($_GET["cmdClass"], "sel_question_types", $_GET["sel_question_types"]);
                                        ilUtil::sendSuccess($this->lng->txt("msg_obj_modified"), true);

                                        //global $___test_express_mode;
                                        if($_REQUEST['prev_qid'])
                                        {
                                                // @todo: bheyser/mbecker wtf? ..... thx@jposselt ....
                                                // mbecker: Possible fix: Just instantiate the obj?
                                                include_once("./Modules/Test/classes/class.ilObjTest.php");
                                                $test = new ilObjTest($_GET["ref_id"], true);
                                                $test->moveQuestionAfter($_REQUEST['prev_qid'], $this->object->getId());
                                        }
                                        if( /*$___test_express_mode || */ $_REQUEST['express_mode'] )
                                        {
                                                global $tree, $ilDB, $ilPluginAdmin;

                                                include_once("./Modules/Test/classes/class.ilObjTest.php");
                                                $test = new ilObjTest($_GET["ref_id"], true);

                                                require_once 'Modules/Test/classes/class.ilTestQuestionSetConfigFactory.php';
                                                $testQuestionSetConfigFactory = new ilTestQuestionSetConfigFactory($tree, $ilDB, $ilPluginAdmin, $test);

                                                $test->insertQuestion(
                                                                $testQuestionSetConfigFactory->getQuestionSetConfig(), $this->object->getId()
                                                );
                                                
                                                require_once 'Modules/Test/classes/class.ilTestExpressPage.php';
                                                $_REQUEST['q_id'] = $this->object->getId();
                                                ilUtil::redirect(ilTestExpressPage::getReturnToPageLink());
                                        }

                                        $this->ctrl->redirectByClass($_GET["cmdClass"], "editQuestion");
                                }
                                if(strcmp($_SESSION["info"], "") != 0)
                                {
                                        ilUtil::sendSuccess($_SESSION["info"] . "<br />" . $this->lng->txt("msg_obj_modified"), true);
                                }
                                else
                                {
                                        ilUtil::sendSuccess($this->lng->txt("msg_obj_modified"), true);
                                }
                                $this->ctrl->redirect($this, 'editQuestion');
                        }
                }
        }

        function saveReturn()
        {
                global $ilUser;
                $old_id = $_GET["q_id"];
                $result = $this->writePostData();
                if($result == 0)
                {
                        $ilUser->setPref("tst_lastquestiontype", $this->object->getQuestionType());
                        $ilUser->writePref("tst_lastquestiontype", $this->object->getQuestionType());
                        $this->object->saveToDb();
                        $originalexists = $this->object->_questionExistsInPool($this->object->original_id);
                        include_once "./Modules/TestQuestionPool/classes/class.assQuestion.php";
                        if(($_GET["calling_test"] || (isset($_GET['calling_consumer']) && (int)$_GET['calling_consumer'])) && $originalexists && assQuestion::_isWriteable($this->object->original_id, $ilUser->getId()))
                        {
                                ilUtil::sendSuccess($this->lng->txt("msg_obj_modified"), true);
                                $this->ctrl->setParameter($this, 'test_express_mode', $_REQUEST['test_express_mode']);
                                $this->ctrl->redirect($this, "originalSyncForm");
                                return;
                        }
                        elseif($_GET["calling_test"])
                        {
                                require_once 'Modules/Test/classes/class.ilObjTest.php';
                                $test = new ilObjTest($_GET["calling_test"]);
                                #var_dump(assQuestion::_questionExistsInTest($this->object->getId(), $test->getTestId()));
                                $q_id = $this->object->getId();
                                if(!assQuestion::_questionExistsInTest($this->object->getId(), $test->getTestId()))
                                {
                                        global $tree, $ilDB, $ilPluginAdmin;
                                        
                                        include_once("./Modules/Test/classes/class.ilObjTest.php");
                                        $_GET["ref_id"] = $_GET["calling_test"];
                                        $test = new ilObjTest($_GET["calling_test"], true);
                                        
                                        require_once 'Modules/Test/classes/class.ilTestQuestionSetConfigFactory.php';
                                        $testQuestionSetConfigFactory = new ilTestQuestionSetConfigFactory($tree, $ilDB, $ilPluginAdmin, $test);

                                        $new_id = $test->insertQuestion(
                                                $testQuestionSetConfigFactory->getQuestionSetConfig(), $this->object->getId()
                                        );
                                        
                                        $q_id = $new_id;
                                        if(isset($_REQUEST['prev_qid']))
                                        {
                                                $test->moveQuestionAfter($this->object->getId() + 1, $_REQUEST['prev_qid']);
                                        }

                                        $this->ctrl->setParameter($this, 'q_id', $new_id);
                                        $this->ctrl->setParameter($this, 'calling_test', $_GET['calling_test']);
                                        #$this->ctrl->setParameter($this, 'test_ref_id', false);

                                }
                                ilUtil::sendSuccess($this->lng->txt("msg_obj_modified"), true);
                                if( /*$___test_express_mode || */
                                $_REQUEST['test_express_mode']
                                )
                                {
                                        ilUtil::redirect(ilTestExpressPage::getReturnToPageLink($q_id));
                                }
                                else
                                {
                                        ilUtil::redirect("ilias.php?baseClass=ilObjTestGUI&cmd=questions&ref_id=" . $_GET["calling_test"]);
                                }
                        }
                        else
                        {
                                if($this->object->getId() != $old_id)
                                {
                                        $this->callNewIdListeners($this->object->getId());
                                        ilUtil::sendSuccess($this->lng->txt("msg_obj_modified"), true);
                                        $this->ctrl->redirectByClass("ilobjquestionpoolgui", "questions");
                                }
                                if(strcmp($_SESSION["info"], "") != 0)
                                {
                                        ilUtil::sendSuccess($_SESSION["info"] . "<br />" . $this->lng->txt("msg_obj_modified"), true);
                                }
                                else
                                {
                                        ilUtil::sendSuccess($this->lng->txt("msg_obj_modified"), true);
                                }
                                $this->ctrl->redirectByClass("ilobjquestionpoolgui", "questions");
                        }
                }
        }

        function apply()
        {
                $this->writePostData();
                $this->object->saveToDb();
                $this->ctrl->setParameter($this, "q_id", $this->object->getId());
                $this->editQuestion();
        }
        
        function getContextPath($cont_obj, $a_endnode_id, $a_startnode_id = 1)
        {
                $path = "";

                $tmpPath = $cont_obj->getLMTree()->getPathFull($a_endnode_id, $a_startnode_id);

                // count -1, to exclude the learning module itself
                for ($i = 1; $i < (count($tmpPath) - 1); $i++)
                {
                        if ($path != "")
                        {
                                $path .= " > ";
                        }

                        $path .= $tmpPath[$i]["title"];
                }

                return $path;
        }

        function setSequenceNumber($nr) 
        {
                $this->sequence_no = $nr;
        }
        
        function getSequenceNumber() 
        {
                return $this->sequence_no;
        }
        
        function setQuestionCount($a_question_count)
        {
                $this->question_count = $a_question_count;
        }
        
        function getQuestionCount()
        {
                return $this->question_count;
        }
        
        function getErrorMessage()
        {
                return $this->errormessage;
        }
        
        function setErrorMessage($errormessage)
        {
                $this->errormessage = $errormessage;
        }

        function addErrorMessage($errormessage)
        {
                $this->errormessage .= ((strlen($this->errormessage)) ? "<br />" : "") . $errormessage;
        }
        
        function outAdditionalOutput()
        {
        }

        function getQuestionType()
        {
                return $this->object->getQuestionType();
        }
        
        public function getAsValueAttribute($a_value)
        {
                $result = "";
                if (strlen($a_value))
                {
                        $result = " value=\"$a_value\" ";
                }
                return $result;
        }

        // scorm2004-start
        function addNewIdListener(&$a_object, $a_method, $a_parameters = "")
        {
                $cnt = $this->new_id_listener_cnt;
                $this->new_id_listeners[$cnt]["object"] =& $a_object;
                $this->new_id_listeners[$cnt]["method"] = $a_method;
                $this->new_id_listeners[$cnt]["parameters"] = $a_parameters;
                $this->new_id_listener_cnt++;
        }

        function callNewIdListeners($a_new_id)
        {

                for ($i=0; $i<$this->new_id_listener_cnt; $i++)
                {
                        $this->new_id_listeners[$i]["parameters"]["new_id"] = $a_new_id;
                        $object =& $this->new_id_listeners[$i]["object"];
                        $method = $this->new_id_listeners[$i]["method"];
                        $parameters = $this->new_id_listeners[$i]["parameters"];
//var_dump($object);
//var_dump($method);
//var_dump($parameters);

                        $object->$method($parameters);
                }
        }
        
        function addQuestionFormCommandButtons($form)
        {
                //if (!$this->object->getSelfAssessmentEditingMode() && !$_GET["calling_test"]) $form->addCommandButton("saveEdit", $this->lng->txt("save_edit"));
                if(!$this->object->getSelfAssessmentEditingMode())
                {
                        $form->addCommandButton("saveReturn", $this->lng->txt("save_return"));
                }
                $form->addCommandButton("save", $this->lng->txt("save"));
        }
        
        function addBasicQuestionFormProperties($form)
        {
            // title
                $title = new ilTextInputGUI($this->lng->txt("title"), "title");
                $title->setMaxLength(100);
                $title->setValue($this->object->getTitle());
                $title->setRequired(TRUE);
                $form->addItem($title);

                if (!$this->object->getSelfAssessmentEditingMode())
                {
                        // author
                        $author = new ilTextInputGUI($this->lng->txt("author"), "author");
                        $author->setValue($this->object->getAuthor());
                        $author->setRequired(TRUE);
                        $form->addItem($author);
        
                        // description
                        $description = new ilTextInputGUI($this->lng->txt("description"), "comment");
                        $description->setValue($this->object->getComment());
                        $description->setRequired(FALSE);
                        $form->addItem($description);
                }
                else
                {
                        // author as hidden field
                        $hi = new ilHiddenInputGUI("author");
                        $author = ilUtil::prepareFormOutput($this->object->getAuthor());
                        if (trim($author) == "")
                        {
                                $author = "-";
                        }
                        $hi->setValue($author);
                        $form->addItem($hi);
                        
                }

                // questiontext
                $question = new ilTextAreaInputGUI($this->lng->txt("question"), "question");
                $question->setValue($this->object->getQuestion());
                $question->setRequired(TRUE);
                $question->setRows(10);
                $question->setCols(80);
                
                if (!$this->object->getSelfAssessmentEditingMode())
                {
                        if( $this->object->getAdditionalContentEditingMode() != assQuestion::ADDITIONAL_CONTENT_EDITING_MODE_PAGE_OBJECT )
                        {
                                $question->setUseRte(TRUE);
                                include_once "./Services/AdvancedEditing/classes/class.ilObjAdvancedEditing.php";
                                $question->setRteTags(ilObjAdvancedEditing::_getUsedHTMLTags("assessment"));
                                $question->addPlugin("latex");
                                $question->addButton("latex");
                                $question->addButton("pastelatex");
                                $question->setRTESupport($this->object->getId(), "qpl", "assessment");
                        }
                }
                else
                {
                        require_once 'Modules/TestQuestionPool/classes/questions/class.ilAssSelfAssessmentQuestionFormatter.php';
                        $question->setRteTags(ilAssSelfAssessmentQuestionFormatter::getSelfAssessmentTags());
                        $question->setUseTagsForRteOnly(false);
                }
                $form->addItem($question);

                if (!$this->object->getSelfAssessmentEditingMode())
                {
                        // duration
                        $duration = new ilDurationInputGUI($this->lng->txt("working_time"), "Estimated");
                        $duration->setShowHours(TRUE);
                        $duration->setShowMinutes(TRUE);
                        $duration->setShowSeconds(TRUE);
                        $ewt = $this->object->getEstimatedWorkingTime();
                        $duration->setHours($ewt["h"]);
                        $duration->setMinutes($ewt["m"]);
                        $duration->setSeconds($ewt["s"]);
                        $duration->setRequired(FALSE);
                        $form->addItem($duration);
                }
                else
                {
                        // number of tries
                        if (strlen($this->object->getNrOfTries()))
                        {
                                $nr_tries = $this->object->getNrOfTries();
                        }
                        else
                        {
                                $nr_tries = $this->object->getDefaultNrOfTries();
                        }                       
                        if ($nr_tries < 1)
                        {
                                $nr_tries = "";
                        }
                        
                        $ni = new ilNumberInputGUI($this->lng->txt("qst_nr_of_tries"), "nr_of_tries");
                        $ni->setValue($nr_tries);
                        $ni->setMinValue(0);
                        $ni->setSize(5);
                        $ni->setMaxLength(5);                   
                        $form->addItem($ni);
                }
        }
        
        protected function saveTaxonomyAssignments()
        {
                if( count($this->getTaxonomyIds()) )
                {
                        require_once 'Services/Taxonomy/classes/class.ilTaxAssignInputGUI.php';
                        
                        foreach($this->getTaxonomyIds() as $taxonomyId)
                        {
                                $postvar = "tax_node_assign_$taxonomyId";
                                
                                $tax_node_assign = new ilTaxAssignInputGUI($taxonomyId, true, '', $postvar);
                                // TODO: determine tst/qpl when tax assigns become maintainable within tests
                                $tax_node_assign->saveInput("qpl", $this->object->getObjId(), "quest", $this->object->getId());
                        }
                }
        }
        
        protected function populateTaxonomyFormSection(ilPropertyFormGUI $form)
        {
                if( count($this->getTaxonomyIds()) )
                {
                        $sectHeader = new ilFormSectionHeaderGUI();
                        $sectHeader->setTitle($this->lng->txt('qpl_qst_edit_form_taxonomy_section'));
                        $form->addItem($sectHeader);

                        require_once 'Services/Taxonomy/classes/class.ilTaxSelectInputGUI.php';

                        foreach($this->getTaxonomyIds() as $taxonomyId)
                        {
                                $taxonomy = new ilObjTaxonomy($taxonomyId);
                                $label = sprintf($this->lng->txt('qpl_qst_edit_form_taxonomy'), $taxonomy->getTitle());
                                $postvar = "tax_node_assign_$taxonomyId";

                                $taxSelect = new ilTaxSelectInputGUI($taxonomy->getId(), $postvar, true);
                                $taxSelect->setTitle($label);

                                require_once 'Services/Taxonomy/classes/class.ilTaxNodeAssignment.php';
                                $taxNodeAssignments = new ilTaxNodeAssignment(ilObject::_lookupType($this->object->getObjId()), $this->object->getObjId(), 'quest', $taxonomyId);
                                $assignedNodes = $taxNodeAssignments->getAssignmentsOfItem($this->object->getId());

                                $taxSelect->setValue(array_map(function($assignedNode) {
                                        return $assignedNode['node_id'];
                                }, $assignedNodes));
                                $form->addItem($taxSelect);
                        }
                }
        }
        
        function getAnswerFeedbackOutput($active_id, $pass)
        {
                return $this->getGenericFeedbackOutput($active_id, $pass);
        }

        function getGenericFeedbackOutput($active_id, $pass)
        {
                $output = "";
                include_once "./Modules/Test/classes/class.ilObjTest.php";
                $manual_feedback = ilObjTest::getManualFeedback($active_id, $this->object->getId(), $pass);
                if (strlen($manual_feedback))
                {
                        return $manual_feedback;
                }
                $correct_feedback = $this->object->feedbackOBJ->getGenericFeedbackTestPresentation($this->object->getId(), true);
                $incorrect_feedback = $this->object->feedbackOBJ->getGenericFeedbackTestPresentation($this->object->getId(), false);
                if (strlen($correct_feedback.$incorrect_feedback))
                {
                        $reached_points = $this->object->calculateReachedPoints($active_id, $pass);
                        $max_points = $this->object->getMaximumPoints();
                        if ($reached_points == $max_points)
                        {
                                $output = $correct_feedback;
                        }
                        else
                        {
                                $output = $incorrect_feedback;
                        }
                }
                return $this->object->prepareTextareaOutput($output, TRUE);
        }

        public function getGenericFeedbackOutputForCorrectSolution()
        {
                return $this->object->prepareTextareaOutput(
                        $this->object->feedbackOBJ->getGenericFeedbackTestPresentation($this->object->getId(), true), true
                );
        }

        public function getGenericFeedbackOutputForIncorrectSolution()
        {
                return $this->object->prepareTextareaOutput(
                        $this->object->feedbackOBJ->getGenericFeedbackTestPresentation($this->object->getId(), false), true
                );
        }

        abstract function getSpecificFeedbackOutput($active_id, $pass);
        
        public function outQuestionType()
        {
                $count = $this->object->isInUse();
                
                if ($this->object->_questionExistsInPool($this->object->getId()) && $count)
                {
                        global $rbacsystem;
                        if ($rbacsystem->checkAccess("write", $_GET["ref_id"]))
                        {
                                ilUtil::sendInfo(sprintf($this->lng->txt("qpl_question_is_in_use"), $count));
                        }
                }
                
                return assQuestion::_getQuestionTypeName($this->object->getQuestionType());
        }
        
        public function showSuggestedSolution()
        {
                $this->suggestedsolution();
        }

        public function suggestedsolution()
        {
                global $ilUser;
                global $ilAccess;

                $save = (is_array($_POST["cmd"]) && array_key_exists("suggestedsolution", $_POST["cmd"])) ? TRUE : FALSE;

                if ($save && $_POST["deleteSuggestedSolution"] == 1)
                {
                        $this->object->deleteSuggestedSolutions();
                        ilUtil::sendSuccess($this->lng->txt("msg_obj_modified"), true);
                        $this->ctrl->redirect($this, "suggestedsolution");
                }

                $output = "";
                $solution_array = $this->object->getSuggestedSolution(0);
                $options = array(
                        "lm" => $this->lng->txt("obj_lm"),
                        "st" => $this->lng->txt("obj_st"),
                        "pg" => $this->lng->txt("obj_pg"),
                        "git" => $this->lng->txt("glossary_term"),
                        "file" => $this->lng->txt("fileDownload"),
                        "text" => $this->lng->txt("solutionText")
                );

                if ((strcmp($_POST["solutiontype"], "file") == 0) && (strcmp($solution_array["type"], "file") != 0))
                {
                        $solution_array = array(
                                "type" => "file"
                        );
                } 
                elseif ((strcmp($_POST["solutiontype"], "text") == 0) && (strcmp($solution_array["type"], "text") != 0))
                {
                        $oldOutputMode = $this->getRenderPurpose();
                        $this->setRenderPurpose(self::RENDER_PURPOSE_INPUT_VALUE);
                        
                        $solution_array = array(
                                "type" => "text",
                                "value" => $this->getSolutionOutput(0, NULL, FALSE, FALSE, TRUE, FALSE, TRUE)
                        );
                        $this->setRenderPurpose($oldsaveSuggestedSolutionOutputMode);
                }
                if ($save && strlen($_POST["filename"]))
                {
                        $solution_array["value"]["filename"] = $_POST["filename"];
                }
                if ($save && strlen($_POST["solutiontext"]))
                {
                        $solution_array["value"] = $_POST["solutiontext"];
                }
                include_once("./Services/Form/classes/class.ilPropertyFormGUI.php");
                if (count($solution_array))
                {
                        $form = new ilPropertyFormGUI();
                        $form->setFormAction($this->ctrl->getFormAction($this));
                        $form->setTitle($this->lng->txt("solution_hint"));
                        $form->setMultipart(TRUE);
                        $form->setTableWidth("100%");
                        $form->setId("suggestedsolutiondisplay");

                        // suggested solution output
                        include_once "./Modules/TestQuestionPool/classes/class.ilSolutionTitleInputGUI.php";
                        $title = new ilSolutionTitleInputGUI($this->lng->txt("showSuggestedSolution"), "solutiontype");
                        $template = new ilTemplate("tpl.il_as_qpl_suggested_solution_input_presentation.html", TRUE, TRUE, "Modules/TestQuestionPool");
                        if (strlen($solution_array["internal_link"]))
                        {
                                $href = assQuestion::_getInternalLinkHref($solution_array["internal_link"]);
                                $template->setCurrentBlock("preview");
                                $template->setVariable("TEXT_SOLUTION", $this->lng->txt("suggested_solution"));
                                $template->setVariable("VALUE_SOLUTION", " <a href=\"$href\" target=\"content\">" . $this->lng->txt("view"). "</a> ");
                                $template->parseCurrentBlock();
                        }
                        elseif ((strcmp($solution_array["type"], "file") == 0) && (is_array($solution_array["value"])))
                        {
                                $href = $this->object->getSuggestedSolutionPathWeb() . $solution_array["value"]["name"];
                                $template->setCurrentBlock("preview");
                                $template->setVariable("TEXT_SOLUTION", $this->lng->txt("suggested_solution"));
                                $template->setVariable("VALUE_SOLUTION", " <a href=\"$href\" target=\"content\">" . ilUtil::prepareFormOutput((strlen($solution_array["value"]["filename"])) ? $solution_array["value"]["filename"] : $solution_array["value"]["name"]). "</a> ");
                                $template->parseCurrentBlock();
                        }
                        $template->setVariable("TEXT_TYPE", $this->lng->txt("type"));
                        $template->setVariable("VALUE_TYPE", $options[$solution_array["type"]]);
                        $title->setHtml($template->get());
                        $deletesolution = new ilCheckboxInputGUI("", "deleteSuggestedSolution");
                        $deletesolution->setOptionTitle($this->lng->txt("deleteSuggestedSolution"));
                        $title->addSubItem($deletesolution);
                        $form->addItem($title);

                        if (strcmp($solution_array["type"], "file") == 0)
                        {
                                // file
                                $file = new ilFileInputGUI($this->lng->txt("fileDownload"), "file");
                                $file->setRequired(TRUE);
                                $file->enableFileNameSelection("filename");
                                //$file->setSuffixes(array("doc","xls","png","jpg","gif","pdf"));
                                if( $_FILES["file"]["tmp_name"] && $file->checkInput() )
                                {
                                        if (!file_exists($this->object->getSuggestedSolutionPath())) ilUtil::makeDirParents($this->object->getSuggestedSolutionPath());
                                        
                                        $res = ilUtil::moveUploadedFile($_FILES["file"]["tmp_name"], $_FILES["file"]["name"], $this->object->getSuggestedSolutionPath() . $_FILES["file"]["name"]);
                                        if ($res)
                                        {
                                                ilUtil::renameExecutables($this->object->getSuggestedSolutionPath());
                                                
                                                // remove an old file download
                                                if (is_array($solution_array["value"])) @unlink($this->object->getSuggestedSolutionPath() . $solution_array["value"]["name"]);
                                                $file->setValue($_FILES["file"]["name"]);
                                                $this->object->saveSuggestedSolution("file", "", 0, array("name" => $_FILES["file"]["name"], "type" => $_FILES["file"]["type"], "size" => $_FILES["file"]["size"], "filename" => $_POST["filename"]));
                                                $originalexists = $this->object->_questionExistsInPool($this->object->original_id);
                                                if (($_GET["calling_test"] || (isset($_GET['calling_consumer']) && (int)$_GET['calling_consumer'])) && $originalexists && assQuestion::_isWriteable($this->object->original_id, $ilUser->getId()))
                                                {
                                                        return $this->originalSyncForm("suggestedsolution");
                                                }
                                                else
                                                {
                                                        ilUtil::sendSuccess($this->lng->txt("suggested_solution_added_successfully"), TRUE);
                                                        $this->ctrl->redirect($this, "suggestedsolution");
                                                }
                                        }
                                        else
                                        {
                                                // BH: $res as info string? wtf? it holds a bool or something else!!?
                                                ilUtil::sendInfo($res);
                                        }
                                }
                                else
                                {
                                        if (is_array($solution_array["value"]))
                                        {
                                                $file->setValue($solution_array["value"]["name"]);
                                                $file->setFilename((strlen($solution_array["value"]["filename"])) ? $solution_array["value"]["filename"] : $solution_array["value"]["name"]);
                                        }
                                }
                                $form->addItem($file);
                                $hidden = new ilHiddenInputGUI("solutiontype");
                                $hidden->setValue("file");
                                $form->addItem($hidden);
                        }
                        else if (strcmp($solution_array["type"], "text") == 0)
                        {
                                $solutionContent = $solution_array['value'];
                                $solutionContent = $this->object->fixSvgToPng($solutionContent);
                                $solutionContent = $this->object->fixUnavailableSkinImageSources($solutionContent);
                                $question = new ilTextAreaInputGUI($this->lng->txt("solutionText"), "solutiontext");
                                $question->setValue($this->object->prepareTextareaOutput($solutionContent));
                                $question->setRequired(TRUE);
                                $question->setRows(10);
                                $question->setCols(80);
                                $question->setUseRte(TRUE);
                                $question->addPlugin("latex");
                                $question->addButton("latex");
                                $question->setRTESupport($this->object->getId(), "qpl", "assessment");
                                $hidden = new ilHiddenInputGUI("solutiontype");
                                $hidden->setValue("text");
                                $form->addItem($hidden);
                                $form->addItem($question);
                        }
                        if ($ilAccess->checkAccess("write", "", $_GET['ref_id']))
                        {
                                $form->addCommandButton('showSuggestedSolution', $this->lng->txt('cancel'));
                                $form->addCommandButton('suggestedsolution', $this->lng->txt('save'));
                        }
                        
                        if ($save)
                        {
                                if ($form->checkInput())
                                {
                                        switch ($solution_array["type"])
                                        {
                                                case "file":
                                                        $this->object->saveSuggestedSolution("file", "", 0, array(
                                                                "name" => $solution_array["value"]["name"],
                                                                "type" => $solution_array["value"]["type"],
                                                                "size" => $solution_array["value"]["size"],
                                                                "filename" => $_POST["filename"]
                                                        ));
                                                        break;
                                                case "text":
                                                        $this->object->saveSuggestedSolution("text", "", 0, $solution_array["value"]);
                                                        break;
                                        }
                                        $originalexists = $this->object->_questionExistsInPool($this->object->original_id);
                                        if (($_GET["calling_test"] || (isset($_GET['calling_consumer']) && (int)$_GET['calling_consumer'])) && $originalexists && assQuestion::_isWriteable($this->object->original_id, $ilUser->getId()))
                                        {
                                                return $this->originalSyncForm("suggestedsolution");
                                        }
                                        else
                                        {
                                                ilUtil::sendSuccess($this->lng->txt("msg_obj_modified"), true);
                                                $this->ctrl->redirect($this, "suggestedsolution");
                                        }
                                }
                        }
                        
                        $output = $form->getHTML();
                }
                
                $savechange = (strcmp($this->ctrl->getCmd(), "saveSuggestedSolution") == 0) ? TRUE : FALSE;

                $changeoutput = "";
                if ($ilAccess->checkAccess("write", "", $_GET['ref_id']))
                {
                        $formchange = new ilPropertyFormGUI();
                        $formchange->setFormAction($this->ctrl->getFormAction($this));
                        $formchange->setTitle((count($solution_array)) ? $this->lng->txt("changeSuggestedSolution") : $this->lng->txt("addSuggestedSolution"));
                        $formchange->setMultipart(FALSE);
                        $formchange->setTableWidth("100%");
                        $formchange->setId("suggestedsolution");

                        $solutiontype = new ilRadioGroupInputGUI($this->lng->txt("suggestedSolutionType"), "solutiontype");
                        foreach($options as $opt_value => $opt_caption)
                        {
                                $solutiontype->addOption(new ilRadioOption($opt_caption, $opt_value));
                        }
                        if (count($solution_array))
                        {
                                $solutiontype->setValue($solution_array["type"]);
                        }
                        $solutiontype->setRequired(TRUE);
                        $formchange->addItem($solutiontype);

                        $formchange->addCommandButton("saveSuggestedSolution", $this->lng->txt("select"));

                        if ($savechange) 
                        {
                                $formchange->checkInput();
                        }
                        $changeoutput = $formchange->getHTML();
                }
                
                $this->tpl->setVariable("ADM_CONTENT", $changeoutput . $output);
        }
        
        public function outSolutionExplorer()
        {
                global $tree;

                include_once("./Modules/TestQuestionPool/classes/class.ilSolutionExplorer.php");
                $type = $_GET["link_new_type"];
                $search = $_GET["search_link_type"];
                $this->ctrl->setParameter($this, "link_new_type", $type);
                $this->ctrl->setParameter($this, "search_link_type", $search);
                $this->ctrl->saveParameter($this, array("subquestion_index", "link_new_type", "search_link_type"));

                ilUtil::sendInfo($this->lng->txt("select_object_to_link"));

                $parent_ref_id = $tree->getParentId($_GET["ref_id"]);
                $exp = new ilSolutionExplorer($this->ctrl->getLinkTarget($this, 'suggestedsolution'), get_class($this));
                $exp->setExpand($_GET['expand_sol'] ? $_GET['expand_sol'] : $parent_ref_id);
                $exp->setExpandTarget($this->ctrl->getLinkTarget($this, 'outSolutionExplorer'));
                $exp->setTargetGet("ref_id");
                $exp->setRefId($_GET["ref_id"]);
                $exp->addFilter($type);
                $exp->setSelectableType($type);
                if(isset($_GET['expandCurrentPath']) && $_GET['expandCurrentPath'])
                {
                        $exp->expandPathByRefId($parent_ref_id);
                }

                // build html-output
                $exp->setOutput(0);

                $template = new ilTemplate("tpl.il_as_qpl_explorer.html", TRUE, TRUE, "Modules/TestQuestionPool");
                $template->setVariable("EXPLORER_TREE",$exp->getOutput());
                $template->setVariable("BUTTON_CANCEL",$this->lng->txt("cancel"));
                $template->setVariable("FORMACTION",$this->ctrl->getFormAction($this, "suggestedsolution"));
                $this->tpl->setVariable("ADM_CONTENT", $template->get());
        }
        
        public function saveSuggestedSolution()
        {
                global $tree;

                include_once("./Modules/TestQuestionPool/classes/class.ilSolutionExplorer.php");
                switch ($_POST["solutiontype"])
                {
                        case "lm":
                                $type = "lm";
                                $search = "lm";
                                break;
                        case "git":
                                $type = "glo";
                                $search = "glo";
                                break;
                        case "st":
                                $type = "lm";
                                $search = "st";
                                break;
                        case "pg":
                                $type = "lm";
                                $search = "pg";
                                break;
                        case "file":
                        case "text":
                                return $this->suggestedsolution();
                                break;
                        default:
                                return $this->suggestedsolution();
                                break;
                }
                if(isset($_POST['solutiontype']))
                {
                        $this->ctrl->setParameter($this, 'expandCurrentPath', 1);
                }
                $this->ctrl->setParameter($this, "link_new_type", $type);
                $this->ctrl->setParameter($this, "search_link_type", $search);
                $this->ctrl->redirect($this, "outSolutionExplorer");
        }

        function cancelExplorer()
        {
                $this->ctrl->redirect($this, "suggestedsolution");
        }
        
        function outPageSelector()
        {
                require_once 'Modules/TestQuestionPool/classes/tables/class.ilQuestionInternalLinkSelectionTableGUI.php';
                require_once 'Modules/LearningModule/classes/class.ilLMPageObject.php';
                require_once 'Modules/LearningModule/classes/class.ilObjContentObjectGUI.php';

                $this->ctrl->setParameter($this, 'q_id', $this->object->getId());

                $cont_obj_gui = new ilObjContentObjectGUI('', $_GET['source_id'], true);
                $cont_obj     = $cont_obj_gui->object;
                $pages        = ilLMPageObject::getPageList($cont_obj->getId());
                $shownpages   = array();
                $tree         = $cont_obj->getLMTree();
                $chapters     = $tree->getSubtree($tree->getNodeData($tree->getRootId()));

                $rows = array();

                foreach($chapters as $chapter)
                {
                        $chapterpages = $tree->getChildsByType($chapter['obj_id'], 'pg');
                        foreach($chapterpages as $page)
                        {
                                if($page['type'] == $_GET['search_link_type'])
                                {
                                        array_push($shownpages, $page['obj_id']);

                                        if($tree->isInTree($page['obj_id']))
                                        {
                                                $path_str = $this->getContextPath($cont_obj, $page['obj_id']);
                                        }
                                        else
                                        {
                                                $path_str = '---';
                                        }

                                        $this->ctrl->setParameter($this, $page['type'], $page['obj_id']);
                                        $rows[] = array(
                                                'title'       => $page['title'],
                                                'description' => ilUtil::prepareFormOutput($path_str),
                                                'text_add'    => $this->lng->txt('add'),
                                                'href_add'    => $this->ctrl->getLinkTarget($this, 'add' . strtoupper($page['type']))
                                        );
                                }
                        }
                }
                foreach($pages as $page)
                {
                        if(!in_array($page['obj_id'], $shownpages))
                        {
                                $this->ctrl->setParameter($this, $page['type'], $page['obj_id']);
                                $rows[] = array(
                                        'title'       => $page['title'],
                                        'description' => '---',
                                        'text_add'    => $this->lng->txt('add'),
                                        'href_add'    => $this->ctrl->getLinkTarget($this, 'add' . strtoupper($page['type']))
                                );
                        }
                }

                require_once 'Modules/TestQuestionPool/classes/tables/class.ilQuestionInternalLinkSelectionTableGUI.php';
                $table = new ilQuestionInternalLinkSelectionTableGUI($this, 'cancelExplorer', __METHOD__);
                $table->setTitle($this->lng->txt('obj_' . ilUtil::stripSlashes($_GET['search_link_type'])));
                $table->setData($rows);

                $this->tpl->setContent($table->getHTML());
        }

        public function outChapterSelector()
        {
                require_once 'Modules/TestQuestionPool/classes/tables/class.ilQuestionInternalLinkSelectionTableGUI.php';
                require_once 'Modules/LearningModule/classes/class.ilObjContentObjectGUI.php';

                $this->ctrl->setParameter($this, 'q_id', $this->object->getId());

                $cont_obj_gui = new ilObjContentObjectGUI('', $_GET['source_id'], true);
                $cont_obj = $cont_obj_gui->object;
                $ctree = $cont_obj->getLMTree();
                $nodes = $ctree->getSubtree($ctree->getNodeData($ctree->getRootId()));

                $rows = array();

                foreach($nodes as $node)
                {
                        if($node['type'] == $_GET['search_link_type'])
                        {
                                $this->ctrl->setParameter($this, $node['type'], $node['obj_id']);
                                $rows[] = array(
                                        'title'       => $node['title'],
                                        'description' => '',
                                        'text_add'    => $this->lng->txt('add'),
                                        'href_add'    => $this->ctrl->getLinkTarget($this, 'add' . strtoupper($node['type'])) 
                                );
                        }
                }

                $table = new ilQuestionInternalLinkSelectionTableGUI($this, 'cancelExplorer', __METHOD__);
                $table->setTitle($this->lng->txt('obj_' . ilUtil::stripSlashes($_GET['search_link_type'])));
                $table->setData($rows);

                $this->tpl->setContent($table->getHTML());
        }

        public function outGlossarySelector()
        {
                require_once 'Modules/TestQuestionPool/classes/tables/class.ilQuestionInternalLinkSelectionTableGUI.php';
                require_once 'Modules/Glossary/classes/class.ilObjGlossary.php';

                $this->ctrl->setParameter($this, 'q_id', $this->object->getId());

                $glossary = new ilObjGlossary($_GET['source_id'], true);
                $terms = $glossary->getTermList();

                $rows = array();

                foreach($terms as $term)
                {
                        $this->ctrl->setParameter($this, 'git', $term['id']);
                        $rows[] = array(
                                'title'       => $term['term'],
                                'description' => '',
                                'text_add'    => $this->lng->txt('add'),
                                'href_add'    => $this->ctrl->getLinkTarget($this, 'addGIT')
                        );
                }

                $table = new ilQuestionInternalLinkSelectionTableGUI($this, 'cancelExplorer', __METHOD__);
                $table->setTitle($this->lng->txt('glossary_term'));
                $table->setData($rows);

                $this->tpl->setContent($table->getHTML());
        }
        
        function linkChilds()
        {
                $this->ctrl->saveParameter($this, array("subquestion_index", "link_new_type", "search_link_type"));
                switch ($_GET["search_link_type"])
                {
                        case "pg":
                                return $this->outPageSelector();
                                break;
                        case "st":
                                return $this->outChapterSelector();
                                break;
                        case "glo":
                                return $this->outGlossarySelector();
                                break;
                        case "lm":
                                $subquestion_index = ($_GET["subquestion_index"] > 0) ? $_GET["subquestion_index"] : 0;
                                $this->object->saveSuggestedSolution("lm", "il__lm_" . $_GET["source_id"], $subquestion_index);
                                ilUtil::sendSuccess($this->lng->txt("suggested_solution_added_successfully"), TRUE);
                                $this->ctrl->redirect($this, "suggestedsolution");
                                break;
                }
        }

        function addPG()
        {
                $subquestion_index = 0;
                if (strlen($_GET["subquestion_index"]) && $_GET["subquestion_index"] >= 0)
                {
                        $subquestion_index = $_GET["subquestion_index"];
                }
                $this->object->saveSuggestedSolution("pg", "il__pg_" . $_GET["pg"], $subquestion_index);
                ilUtil::sendSuccess($this->lng->txt("suggested_solution_added_successfully"), TRUE);
                $this->ctrl->redirect($this, "suggestedsolution");
        }

        function addST()
        {
                $subquestion_index = 0;
                if (strlen($_GET["subquestion_index"]) && $_GET["subquestion_index"] >= 0)
                {
                        $subquestion_index = $_GET["subquestion_index"];
                }
                $this->object->saveSuggestedSolution("st", "il__st_" . $_GET["st"], $subquestion_index);
                ilUtil::sendSuccess($this->lng->txt("suggested_solution_added_successfully"), TRUE);
                $this->ctrl->redirect($this, "suggestedsolution");
        }

        function addGIT()
        {
                $subquestion_index = 0;
                if (strlen($_GET["subquestion_index"]) && $_GET["subquestion_index"] >= 0)
                {
                        $subquestion_index = $_GET["subquestion_index"];
                }
                $this->object->saveSuggestedSolution("git", "il__git_" . $_GET["git"], $subquestion_index);
                ilUtil::sendSuccess($this->lng->txt("suggested_solution_added_successfully"), TRUE);
                $this->ctrl->redirect($this, "suggestedsolution");
        }

        function isSaveCommand()
        {
            return in_array($this->ctrl->getCmd(), array('save', 'saveEdit', 'saveReturn'));
        }
                
        public static function getCommandsFromClassConstants($guiClassName, $cmdConstantNameBegin = 'CMD_')
        {
                $reflectionClass = new ReflectionClass($guiClassName);
                
                $commands = null;
                
                if( $reflectionClass instanceof ReflectionClass )
                {
                        $commands = array();
                
                        foreach($reflectionClass->getConstants() as $constName => $constValue)
                        {
                                if( substr($constName, 0, strlen($cmdConstantNameBegin)) == $cmdConstantNameBegin )
                                {
                                        $commands[] = $constValue;
                                }
                        }
                }
                
                return $commands;
        }
        
        public function setQuestionTabs()
        {
                global $rbacsystem, $ilTabs;

                $ilTabs->clearTargets();

                $this->ctrl->setParameterByClass("ilAssQuestionPageGUI", "q_id", $_GET["q_id"]);
                include_once "./Modules/TestQuestionPool/classes/class.assQuestion.php";
                $q_type = $this->object->getQuestionType();

                if (strlen($q_type))
                {
                        $classname = $q_type . "GUI";
                        $this->ctrl->setParameterByClass(strtolower($classname), "sel_question_types", $q_type);
                        $this->ctrl->setParameterByClass(strtolower($classname), "q_id", $_GET["q_id"]);
                }

                if ($_GET["q_id"])
                {
                        if ($rbacsystem->checkAccess('write', $_GET["ref_id"]))
                        {
                                // edit page
                                $ilTabs->addTarget("edit_page",
                                        $this->ctrl->getLinkTargetByClass("ilAssQuestionPageGUI", "edit"),
                                        array("edit", "insert", "exec_pg"),
                                        "", "", $force_active);
                        }

                        $this->addTab_QuestionPreview($ilTabs);
                }
                $force_active = false;
                if ($rbacsystem->checkAccess('write', $_GET["ref_id"]))
                {
                        $url = "";
                        if ($classname) $url = $this->ctrl->getLinkTargetByClass($classname, "editQuestion");
                        $force_active = false;
                        // edit question properties
                        $ilTabs->addTarget("edit_question",
                                $url,
                                $this->getEditQuestionTabCommands(),
                                $classname, "", $force_active);
                }

                // add tab for question feedback within common class assQuestionGUI
                $this->addTab_QuestionFeedback($ilTabs);

                // add tab for question hint within common class assQuestionGUI
                $this->addTab_QuestionHints($ilTabs);

                // add tab for question's suggested solution within common class assQuestionGUI
                $this->addTab_SuggestedSolution($ilTabs, $classname);

                // Assessment of questions sub menu entry
                if ($_GET["q_id"])
                {
                        $ilTabs->addTarget("statistics",
                                $this->ctrl->getLinkTargetByClass($classname, "assessment"),
                                array("assessment"),
                                $classname, "");
                }

                $this->addBackTab($ilTabs);
        }
        
        public function addTab_SuggestedSolution(ilTabsGUI $tabs, $classname)
        {
                if ($_GET["q_id"])
                {
                        $tabs->addTarget("suggested_solution",
                                $this->ctrl->getLinkTargetByClass($classname, "suggestedsolution"),
                                array("suggestedsolution", "saveSuggestedSolution", "outSolutionExplorer", "cancel",
                                        "addSuggestedSolution","cancelExplorer", "linkChilds", "removeSuggestedSolution"
                                ),
                                $classname,
                                ""
                        );
                }
        }
        
        final public function getEditQuestionTabCommands()
        {
                return array_merge($this->getBasicEditQuestionTabCommands(), $this->getAdditionalEditQuestionCommands());
        }
        
        protected function getBasicEditQuestionTabCommands()
        {
                return array('editQuestion', 'save', 'saveEdit', 'originalSyncForm');
        }
        
        protected function getAdditionalEditQuestionCommands()
        {
                return array();
        }
        
        protected function addTab_QuestionFeedback(ilTabsGUI $tabs)
        {
                global $ilCtrl;

                require_once 'Modules/TestQuestionPool/classes/class.ilAssQuestionFeedbackEditingGUI.php';
                $tabCommands = self::getCommandsFromClassConstants('ilAssQuestionFeedbackEditingGUI');
                
                $tabLink = $ilCtrl->getLinkTargetByClass('ilAssQuestionFeedbackEditingGUI', ilAssQuestionFeedbackEditingGUI::CMD_SHOW);
                
                $tabs->addTarget('tst_feedback', $tabLink, $tabCommands, $ilCtrl->getCmdClass(), '');
        }

        protected function addTab_Units(ilTabsGUI $tabs)
        {
                global $ilCtrl;

                $tabs->addTarget('units', $ilCtrl->getLinkTargetByClass('ilLocalUnitConfigurationGUI', ''), '', 'illocalunitconfigurationgui');
        }
        
        protected function addTab_QuestionHints(ilTabsGUI $tabs)
        {
                global $ilCtrl;

                require_once 'Modules/TestQuestionPool/classes/class.ilAssQuestionHintsGUI.php';

                switch( $ilCtrl->getCmdClass() )
                {
                        case 'ilassquestionhintsgui':
                                
                                $tabCommands = self::getCommandsFromClassConstants('ilAssQuestionHintsGUI');
                                break;

                        case 'ilassquestionhintgui':
                                
                                require_once 'Modules/TestQuestionPool/classes/class.ilAssQuestionHintGUI.php';
                                $tabCommands = self::getCommandsFromClassConstants('ilAssQuestionHintGUI');
                                break;
                        
                        default:
                                
                                $tabCommands = array();
                }

                $tabLink = $ilCtrl->getLinkTargetByClass('ilAssQuestionHintsGUI', ilAssQuestionHintsGUI::CMD_SHOW_LIST);
                
                $tabs->addTarget('tst_question_hints_tab', $tabLink, $tabCommands, $ilCtrl->getCmdClass(), '');
        }
        
        protected function addTab_QuestionPreview(ilTabsGUI $tabsGUI)
        {
                require_once 'Modules/TestQuestionPool/classes/class.ilAssQuestionPreviewGUI.php';

                $tabsGUI->addTarget(
                        ilAssQuestionPreviewGUI::TAB_ID_QUESTION_PREVIEW,
                        $this->ctrl->getLinkTargetByClass('ilAssQuestionPreviewGUI', ilAssQuestionPreviewGUI::CMD_SHOW),
                        array(),
                        array('ilAssQuestionPreviewGUI')
                );
        }

        abstract public function getSolutionOutput(
                $active_id,
                $pass = NULL,
                $graphicalOutput = FALSE,
                $result_output = FALSE,
                $show_question_only = TRUE,
                $show_feedback = FALSE,
                $show_correct_solution = FALSE,
                $show_manual_scoring = FALSE,
                $show_question_text = TRUE
        );
        
        protected function hasCorrectSolution($activeId, $passIndex)
        {
                $reachedPoints = $this->object->getAdjustedReachedPoints($activeId, $passIndex, true);
                $maximumPoints = $this->object->getMaximumPoints();
                
                return $reachedPoints == $maximumPoints;
        }
        
        public function isAutosaveable()
        {
                return $this->object->isAutosaveable();
        }

        protected function writeQuestionGenericPostData()
        {
                $this->object->setTitle( $_POST["title"] );
                $this->object->setAuthor( $_POST["author"] );
                $this->object->setComment( $_POST["comment"] );
                if ($this->object->getSelfAssessmentEditingMode())
                {
                        $this->object->setNrOfTries( $_POST['nr_of_tries'] );
                }
                $this->object->setQuestion( ilUtil::stripOnlySlashes($_POST['question']) ); // ?
                $this->object->setEstimatedWorkingTime(
                        $_POST["Estimated"]["hh"],
                        $_POST["Estimated"]["mm"],
                        $_POST["Estimated"]["ss"]
                );
        }

        abstract public function getPreview($show_question_only = FALSE, $showInlineFeedback = false);

        final public function outQuestionForTest(
                $formaction,
                $active_id,
                // hey: prevPassSolutions - pass will be always available from now on
                $pass,
                // hey.
                $is_question_postponed = FALSE,
                $user_post_solutions = FALSE,
                $show_specific_inline_feedback = FALSE
        )
        {
                $formaction = $this->completeTestOutputFormAction($formaction, $active_id, $pass);
                
                $test_output = $this->getTestOutput(
                        $active_id,
                        $pass,
                        $is_question_postponed,
                        $user_post_solutions,
                        $show_specific_inline_feedback
                );
                
                $this->magicAfterTestOutput();

                $this->tpl->setVariable("QUESTION_OUTPUT", $test_output);
                $this->tpl->setVariable("FORMACTION", $formaction);
                $this->tpl->setVariable("ENCTYPE", 'enctype="'.$this->getFormEncodingType().'"');
                $this->tpl->setVariable("FORM_TIMESTAMP", time());
        }
        
        // hey: prevPassSolutions - $pass will be passed always from now on
        protected function completeTestOutputFormAction($formAction, $active_id, $pass)
        // hey.
        {
                return $formAction;
        }
        
        public function magicAfterTestOutput()
        {
                return;
        }
        
        abstract public function getTestOutput(
                $active_id,
                $pass,
                $is_question_postponed,
                $user_post_solutions,
                $show_specific_inline_feedback
        );

        public function getFormEncodingType()
        {
                return self::FORM_ENCODING_URLENCODE;
        }

        protected function addBackTab(ilTabsGUI $ilTabs)
        {
                if(($_GET["calling_test"] > 0) || ($_GET["test_ref_id"] > 0))
                {
                        $ref_id = $_GET["calling_test"];
                        if(strlen($ref_id) == 0) $ref_id = $_GET["test_ref_id"];

                        if(!$_GET['test_express_mode'] && !$GLOBALS['___test_express_mode'])
                        {
                                $ilTabs->setBackTarget($this->lng->txt("backtocallingtest"), "ilias.php?baseClass=ilObjTestGUI&cmd=questions&ref_id=$ref_id");
                        }
                        else
                        {
                                $link = ilTestExpressPage::getReturnToPageLink();
                                $ilTabs->setBackTarget($this->lng->txt("backtocallingtest"), $link);
                        }
                }
                else if(isset($_GET['calling_consumer']) && (int)$_GET['calling_consumer'])
                {
                        $ref_id = (int)$_GET['calling_consumer'];
                        $consumer = ilObjectFactory::getInstanceByRefId($ref_id);
                        if($consumer instanceof ilQuestionEditingFormConsumer)
                        {
                                $ilTabs->setBackTarget($consumer->getQuestionEditingFormBackTargetLabel(), $consumer->getQuestionEditingFormBackTarget($_GET['consumer_context']));
                        }
                        else
                        {
                                require_once 'Services/Link/classes/class.ilLink.php';
                                $ilTabs->setBackTarget($this->lng->txt("qpl"), ilLink::_getLink($ref_id));
                        }
                }
                else
                {
                        $ilTabs->setBackTarget($this->lng->txt("qpl"), $this->ctrl->getLinkTargetByClass("ilobjquestionpoolgui", "questions"));
                }
        }

        private $previewSession;

        public function setPreviewSession($previewSession)
        {
                $this->previewSession = $previewSession;
        }

        public function getPreviewSession()
        {
                return $this->previewSession;
        }

        protected function buildBasicEditFormObject()
        {
                require_once 'Services/Form/classes/class.ilPropertyFormGUI.php';
                $form = new ilPropertyFormGUI();

                $form->setFormAction($this->ctrl->getFormAction($this));

                $form->setId($this->getType());
                $form->setTitle($this->outQuestionType());

                $form->setTableWidth('100%');

                $form->setMultipart(true);
                
                return $form;
        }

        public function showHints()
        {
                global $ilCtrl;
                $ilCtrl->redirectByClass('ilAssQuestionHintsGUI', ilAssQuestionHintsGUI::CMD_SHOW_LIST);
        }

        protected function buildEditForm()
        {
                $errors = $this->editQuestion(true); // TODO bheyser: editQuestion should be added to the abstract base class with a unified signature
                return $this->editForm;
        }
}