class.ilAssQuestionSkillAssignmentsGUI.php

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


class ilAssQuestionSkillAssignmentsGUI
{
        const CMD_SHOW_SKILL_QUEST_ASSIGNS = 'showSkillQuestionAssignments';
        const CMD_SHOW_SKILL_SELECT = 'showSkillSelection';
        const CMD_UPDATE_SKILL_QUEST_ASSIGNS = 'updateSkillQuestionAssignments';
        const CMD_SHOW_SKILL_QUEST_ASSIGN_PROPERTIES_FORM = 'showSkillQuestionAssignmentPropertiesForm';
        const CMD_SAVE_SKILL_QUEST_ASSIGN_PROPERTIES_FORM = 'saveSkillQuestionAssignmentPropertiesForm';
        const CMD_SAVE_SKILL_POINTS = 'saveSkillPoints';
        const CMD_SHOW_SYNC_ORIGINAL_CONFIRMATION = 'showSyncOriginalConfirmation';
        const CMD_SYNC_ORIGINAL = 'syncOriginal';
        
        const PARAM_SKILL_SELECTION = 'skill_ids';
        
        private $ctrl;
        
        private $access;

        private $tpl;

        private $lng;

        private $db;

        private $questionList;

        private $questionContainerId;

        private $assignmentEditingEnabled;

        private $questionOrderSequence;

        private $assignmentConfigurationHintMessage;

        public function __construct(ilCtrl $ctrl, ilAccessHandler $access, ilTemplate $tpl, ilLanguage $lng, ilDB $db)
        {
                $this->ctrl = $ctrl;
                $this->access = $access;
                $this->tpl = $tpl;
                $this->lng = $lng;
                $this->db = $db;
        }

        public function getQuestionOrderSequence()
        {
                return $this->questionOrderSequence;
        }

        public function getAssignmentConfigurationHintMessage()
        {
                return $this->assignmentConfigurationHintMessage;
        }

        public function setAssignmentConfigurationHintMessage($assignmentConfigurationHintMessage)
        {
                $this->assignmentConfigurationHintMessage = $assignmentConfigurationHintMessage;
        }

        public function setQuestionOrderSequence($questionOrderSequence)
        {
                $this->questionOrderSequence = $questionOrderSequence;
        }

        public function getQuestionList()
        {
                return $this->questionList;
        }

        public function setQuestionList($questionList)
        {
                $this->questionList = $questionList;
        }

        public function getQuestionContainerId()
        {
                return $this->questionContainerId;
        }

        public function setQuestionContainerId($questionContainerId)
        {
                $this->questionContainerId = $questionContainerId;
        }

        public function isAssignmentEditingEnabled()
        {
                return $this->assignmentEditingEnabled;
        }

        public function setAssignmentEditingEnabled($assignmentEditingEnabled)
        {
                $this->assignmentEditingEnabled = $assignmentEditingEnabled;
        }

        public function executeCommand()
        {
                $nextClass = $this->ctrl->getNextClass();
                
                $command = $this->ctrl->getCmd(self::CMD_SHOW_SKILL_QUEST_ASSIGNS);
                
                if( $this->isAvoidManipulationRedirectRequired($command) )
                {
                        $this->ctrl->redirect($this, self::CMD_SHOW_SKILL_QUEST_ASSIGNS);
                }
                
                switch($nextClass)
                {
                        case strtolower(__CLASS__):
                        case '':
                                
                                $command .= 'Cmd';
                                $this->$command();
                                break;
                                
                        default:
                                
                                throw new ilTestQuestionPoolException('unsupported next class in ctrl flow');
                }
        }
        
        private function isAvoidManipulationRedirectRequired($command)
        {
                if( $this->isAssignmentEditingEnabled() )
                {
                        return false;
                }
                
                switch($command)
                {
                        case self::CMD_SAVE_SKILL_QUEST_ASSIGN_PROPERTIES_FORM:
                        case self::CMD_UPDATE_SKILL_QUEST_ASSIGNS:
                                
                                return true;
                }
                
                return false;
        }

        private function saveSkillPointsCmd()
        {
                if( is_array($_POST['skill_points']) )
                {
                        require_once 'Modules/TestQuestionPool/classes/class.ilAssQuestionSkillAssignment.php';

                        $success = false;

                        foreach($_POST['skill_points'] as $assignmentKey => $skillPoints)
                        {
                                $assignmentKey = explode(':',$assignmentKey);
                                $skillBaseId = (int)$assignmentKey[0];
                                $skillTrefId = (int)$assignmentKey[1];
                                $questionId = (int)$assignmentKey[2];

                                if( $this->isTestQuestion($questionId) && (int)$skillPoints > 0 )
                                {
                                        $assignment = new ilAssQuestionSkillAssignment($this->db);

                                        $assignment->setParentObjId($this->getQuestionContainerId());
                                        $assignment->setQuestionId($questionId);
                                        $assignment->setSkillBaseId($skillBaseId);
                                        $assignment->setSkillTrefId($skillTrefId);

                                        if( $assignment->dbRecordExists() )
                                        {
                                                $assignment->loadFromDb();

                                                if( !$assignment->hasEvalModeBySolution() )
                                                {
                                                        $assignment->setSkillPoints((int)$skillPoints);
                                                        $assignment->saveToDb();
                                                }
                                        }
                                }
                        }
                }

                ilUtil::sendSuccess($this->lng->txt('tst_msg_skl_qst_assign_points_saved'), true);
                $this->ctrl->redirect($this, self::CMD_SHOW_SKILL_QUEST_ASSIGNS);
        }

        private function updateSkillQuestionAssignmentsCmd()
        {
                require_once 'Modules/TestQuestionPool/classes/class.ilAssQuestionSkillAssignmentList.php';
                
                $questionId = (int)$_GET['question_id'];

                if( $this->isTestQuestion($questionId) )
                {
                        $assignmentList = new ilAssQuestionSkillAssignmentList($this->db);
                        $assignmentList->setParentObjId($this->getQuestionContainerId());
                        $assignmentList->loadFromDb();

                        $handledSkills = array();
                        
                        //$skillIds = (array)$_POST['skill_ids'];
                        $sgui = $this->buildSkillSelectorExplorerGUI(array());
                        $skillIds = $sgui->getSelectedSkills();
                        
                        foreach($skillIds as $skillId)
                        {
                                $skill = explode(':',$skillId);
                                $skillBaseId = (int)$skill[0];
                                $skillTrefId = (int)$skill[1];
                                
                                if( $skillBaseId )
                                {
                                        if( !$assignmentList->isAssignedToQuestionId($skillBaseId, $skillTrefId, $questionId) )
                                        {
                                                $assignment = new ilAssQuestionSkillAssignment($this->db);

                                                $assignment->setParentObjId($this->getQuestionContainerId());
                                                $assignment->setQuestionId($questionId);
                                                $assignment->setSkillBaseId($skillBaseId);
                                                $assignment->setSkillTrefId($skillTrefId);

                                                $assignment->setSkillPoints(ilAssQuestionSkillAssignment::DEFAULT_COMPETENCE_POINTS);
                                                $assignment->setEvalMode(ilAssQuestionSkillAssignment::EVAL_MODE_BY_QUESTION_RESULT);
                                                $assignment->saveToDb();
                                        }
                                        
                                        $handledSkills[$skillId] = $skill;
                                }
                        }
                        
                        foreach($assignmentList->getAssignmentsByQuestionId($questionId) as $assignment)
                        {
                                if( isset($handledSkills["{$assignment->getSkillBaseId()}:{$assignment->getSkillTrefId()}"]) )
                                {
                                        continue;
                                }

                                $assignment->deleteFromDb();
                        }

                        ilUtil::sendSuccess($this->lng->txt('qpl_qst_skl_assigns_updated'), true);
                        
                        if( $this->isSyncOriginalPossibleAndAllowed($questionId) )
                        {
                                $this->keepAssignmentParameters();
                                $this->ctrl->redirect($this, self::CMD_SHOW_SYNC_ORIGINAL_CONFIRMATION);
                        }
                }
                
                $this->ctrl->redirect($this, self::CMD_SHOW_SKILL_QUEST_ASSIGNS);
        }

        private function showSkillSelectionCmd()
        {
                $this->ctrl->saveParameter($this, 'question_id');
                $questionId = (int)$_GET['question_id'];

                require_once 'Modules/TestQuestionPool/classes/class.ilAssQuestionSkillAssignmentList.php';
                $assignmentList = new ilAssQuestionSkillAssignmentList($this->db);
                $assignmentList->setParentObjId($this->getQuestionContainerId());
                $assignmentList->loadFromDb();

                $skillSelectorExplorerGUI = $this->buildSkillSelectorExplorerGUI(
                        $assignmentList->getAssignmentsByQuestionId($questionId)
                );

                if( !$skillSelectorExplorerGUI->handleCommand() )
                {
                        $tpl = new ilTemplate('tpl.qpl_qst_skl_assign_selection.html', false, false, 'Modules/TestQuestionPool');

                        $tpl->setVariable('SKILL_SELECTOR_HEADER', $this->getSkillSelectorHeader($questionId));
                        
                        $skillSelectorToolbarGUI = $this->buildSkillSelectorToolbarGUI();

                        $skillSelectorToolbarGUI->setOpenFormTag(true);
                        $skillSelectorToolbarGUI->setCloseFormTag(false);
                        $skillSelectorToolbarGUI->setLeadingImage(ilUtil::getImagePath("arrow_upright.svg"), " ");
                        $tpl->setVariable('SKILL_SELECTOR_TOOLBAR_TOP', $this->ctrl->getHTML($skillSelectorToolbarGUI));
                        
                        $tpl->setVariable('SKILL_SELECTOR_EXPLORER', $this->ctrl->getHTML($skillSelectorExplorerGUI));

                        $skillSelectorToolbarGUI->setOpenFormTag(false);
                        $skillSelectorToolbarGUI->setCloseFormTag(true);
                        $skillSelectorToolbarGUI->setLeadingImage(ilUtil::getImagePath("arrow_downright.svg"), " ");
                        $tpl->setVariable('SKILL_SELECTOR_TOOLBAR_BOTTOM', $this->ctrl->getHTML($skillSelectorToolbarGUI));
                        
                        $this->tpl->setContent($tpl->get());
                }
        }
        
        private function showSkillQuestionAssignmentPropertiesFormCmd(
                assQuestionGUI $questionGUI = null, ilAssQuestionSkillAssignment $assignment = null, ilPropertyFormGUI $form = null
        )
        {
                $this->handleAssignmentConfigurationHintMessage();

                $this->keepAssignmentParameters();
                
                if( $questionGUI === null )
                {
                        require_once 'Modules/TestQuestionPool/classes/class.assQuestionGUI.php';
                        $questionGUI = assQuestionGUI::_getQuestionGUI('', (int)$_GET['question_id']);
                }

                if( $assignment === null )
                {
                        $assignment = $this->buildQuestionSkillAssignment(
                                (int)$_GET['question_id'], (int)$_GET['skill_base_id'], (int)$_GET['skill_tref_id']
                        );
                }
                
                if( $form === null )
                {
                        $form = $this->buildSkillQuestionAssignmentPropertiesForm($questionGUI->object, $assignment);
                }

                $questionPageHTML = $this->buildQuestionPage($questionGUI);

                $lacLegendHTML = $this->buildLacLegendHTML($questionGUI->object, $assignment);

                $this->tpl->setContent( $this->ctrl->getHTML($form).'<br />'.$questionPageHTML.$lacLegendHTML );
        }
        
        private function saveSkillQuestionAssignmentPropertiesFormCmd()
        {
                $questionId = (int)$_GET['question_id'];
                
                if( $this->isTestQuestion($questionId) )
                {
                        require_once 'Modules/TestQuestionPool/classes/class.assQuestionGUI.php';
                        $questionGUI = assQuestionGUI::_getQuestionGUI('', $questionId);
        
                        $assignment = $this->buildQuestionSkillAssignment(
                                (int)$_GET['question_id'], (int)$_GET['skill_base_id'], (int)$_GET['skill_tref_id']
                        );
        
                        $form = $this->buildSkillQuestionAssignmentPropertiesForm($questionGUI->object, $assignment);
        
                        $form->setValuesByPost();
                        
                        if( !$form->checkInput() )
                        {
                                $this->keepAssignmentParameters();
                                $this->showSkillQuestionAssignmentPropertiesFormCmd($questionGUI, $assignment, $form);
                                return;
                        }

                        if($form->getItemByPostVar('eval_mode'))
                        {
                                $assignment->setEvalMode($form->getItemByPostVar('eval_mode')->getValue());
                        }
                        else
                        {
                                $assignment->setEvalMode(ilAssQuestionSkillAssignment::EVAL_MODE_BY_QUESTION_RESULT);
                        }

                        if($assignment->hasEvalModeBySolution())
                        {
                                $solCmpExprInput = $form->getItemByPostVar('solution_compare_expressions');
                                
                                if( !$this->checkSolutionCompareExpressionInput($solCmpExprInput, $questionGUI->object) )
                                {
                                        ilUtil::sendFailure($this->lng->txt("form_input_not_valid"));
                                        $this->keepAssignmentParameters();
                                        $this->showSkillQuestionAssignmentPropertiesFormCmd($questionGUI, $assignment, $form);
                                        return;
                                }

                                $assignment->initSolutionComparisonExpressionList();
                                $assignment->getSolutionComparisonExpressionList()->reset();
                                
                                foreach($solCmpExprInput->getValues() as $expression)
                                {
                                        $assignment->getSolutionComparisonExpressionList()->add($expression);
                                }
                        }
                        else
                        {
                                $assignment->setSkillPoints($form->getItemByPostVar('q_res_skill_points')->getValue());
                        }
                        
                        $assignment->saveToDb();
                        
                        ilUtil::sendSuccess($this->lng->txt('qpl_qst_skl_assign_properties_modified'), true);

                        if( $this->isSyncOriginalPossibleAndAllowed($questionId) )
                        {
                                $this->keepAssignmentParameters();
                                $this->ctrl->redirect($this, self::CMD_SHOW_SYNC_ORIGINAL_CONFIRMATION);
                        }
                }

                $this->ctrl->redirect($this, self::CMD_SHOW_SKILL_QUEST_ASSIGNS);
        }
        
        private function buildSkillQuestionAssignmentPropertiesForm(assQuestion $question, ilAssQuestionSkillAssignment $assignment)
        {
                require_once 'Modules/TestQuestionPool/classes/forms/class.ilAssQuestionSkillAssignmentPropertyFormGUI.php';
                $form = new ilAssQuestionSkillAssignmentPropertyFormGUI($this->ctrl, $this->lng, $this);

                $form->setQuestion($question);
                $form->setAssignment($assignment);
                $form->setManipulationEnabled($this->isAssignmentEditingEnabled());

                $form->build();
                
                return $form;
        }

        private function showSkillQuestionAssignmentsCmd()
        {
                $this->handleAssignmentConfigurationHintMessage();
                
                $table = $this->buildTableGUI();

                $assignmentList = $this->buildSkillQuestionAssignmentList();
                $assignmentList->loadFromDb();
                $assignmentList->loadAdditionalSkillData();
                $table->setSkillQuestionAssignmentList($assignmentList);

                $table->setData($this->orderQuestionData(
                        $this->questionList->getQuestionDataArray()
                ));

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

        private function isSyncOriginalPossibleAndAllowed($questionId)
        {
                $questionData = $this->questionList->getDataArrayForQuestionId($questionId);

                if( !$questionData['original_id'] )
                {
                        return false;
                }

                require_once 'Modules/TestQuestionPool/classes/class.assQuestion.php';
                $parentObjId = assQuestion::lookupParentObjId($questionData['original_id']);

                if( !$this->doesObjectTypeMatch($parentObjId) )
                {
                        return false;
                }

                foreach( ilObject::_getAllReferences($parentObjId) as $parentRefId )
                {
                        if( $this->access->checkAccess('write', '', $parentRefId) )
                        {
                                return true;
                        }
                }

                return false;
        }

        private function showSyncOriginalConfirmationCmd()
        {
                $questionId = (int)$_GET['question_id'];

                require_once 'Services/Utilities/classes/class.ilConfirmationGUI.php';
                $confirmation = new ilConfirmationGUI();

                $confirmation->setHeaderText($this->lng->txt('qpl_sync_quest_skl_assigns_confirmation'));

                $confirmation->setFormAction($this->ctrl->getFormAction($this));
                $confirmation->addHiddenItem('question_id', $questionId);
                $confirmation->setConfirm($this->lng->txt('yes'), self::CMD_SYNC_ORIGINAL);
                $confirmation->setCancel($this->lng->txt('no'), self::CMD_SHOW_SKILL_QUEST_ASSIGNS);

                $this->tpl->setContent($this->ctrl->getHTML($confirmation));
        }

        private function syncOriginalCmd()
        {
                $questionId = (int)$_POST['question_id'];

                if( $this->isTestQuestion($questionId) && $this->isSyncOriginalPossibleAndAllowed($questionId) )
                {
                        $question = assQuestion::_instantiateQuestion($questionId);

                        $question->syncSkillAssignments($question->getObjId(), $question->getId(),
                                $question->lookupParentObjId($question->getOriginalId()), $question->getOriginalId()
                        );

                        ilUtil::sendSuccess($this->lng->txt('qpl_qst_skl_assign_synced_to_orig'), true);
                }

                $this->ctrl->redirect($this, self::CMD_SHOW_SKILL_QUEST_ASSIGNS);
        }

        private function buildTableGUI()
        {
                require_once 'Modules/TestQuestionPool/classes/tables/class.ilAssQuestionSkillAssignmentsTableGUI.php';
                $table = new ilAssQuestionSkillAssignmentsTableGUI($this, self::CMD_SHOW_SKILL_QUEST_ASSIGNS, $this->ctrl, $this->lng);
                $table->setManipulationsEnabled($this->isAssignmentEditingEnabled());
                $table->init();

                return $table;
        }

        private function buildSkillQuestionAssignmentList()
        {
                require_once 'Modules/TestQuestionPool/classes/class.ilAssQuestionSkillAssignmentList.php';
                $assignmentList = new ilAssQuestionSkillAssignmentList($this->db);
                $assignmentList->setParentObjId($this->getQuestionContainerId());

                return $assignmentList;
        }

        private function buildSkillSelectorExplorerGUI($assignments)
        {
                require_once 'Services/Skill/classes/class.ilSkillSelectorGUI.php';

                $skillSelectorExplorerGUI = new ilSkillSelectorGUI(
                        $this, self::CMD_SHOW_SKILL_SELECT, $this, self::CMD_UPDATE_SKILL_QUEST_ASSIGNS, self::PARAM_SKILL_SELECTION
                );

                $skillSelectorExplorerGUI->setSelectMode(self::PARAM_SKILL_SELECTION, true);
                $skillSelectorExplorerGUI->setNodeOnclickEnabled(false);
                
                // parameter name for skill selection is actually taken from value passed to constructor,
                // but passing a non empty name to setSelectMode is neccessary to keep input fields enabled

                foreach($assignments as $assignment)
                {
                        $id = "{$assignment->getSkillBaseId()}:{$assignment->getSkillTrefId()}";
                        //$skillSelectorExplorerGUI->setNodeSelected($id);
                        $skillSelectorExplorerGUI->setSkillSelected($id);
                }

                return $skillSelectorExplorerGUI;
        }

        private function buildSkillSelectorToolbarGUI()
        {
                require_once 'Services/UIComponent/Toolbar/classes/class.ilToolbarGUI.php';

                $skillSelectorToolbarGUI = new ilToolbarGUI();

                $skillSelectorToolbarGUI->setFormAction($this->ctrl->getFormAction($this));
                $skillSelectorToolbarGUI->addFormButton($this->lng->txt('qpl_save_skill_assigns_update'), self::CMD_UPDATE_SKILL_QUEST_ASSIGNS);
                $skillSelectorToolbarGUI->addFormButton($this->lng->txt('qpl_cancel_skill_assigns_update'), self::CMD_SHOW_SKILL_QUEST_ASSIGNS);
                
                return $skillSelectorToolbarGUI;
        }

        private function buildQuestionPage(assQuestionGUI $questionGUI)
        {
                $this->tpl->addCss('Services/COPage/css/content.css');

                include_once("./Modules/TestQuestionPool/classes/class.ilAssQuestionPageGUI.php");
                $pageGUI = new ilAssQuestionPageGUI($questionGUI->object->getId());

                $pageGUI->setOutputMode("presentation");
                $pageGUI->setRenderPageContainer(true);

                $pageGUI->setPresentationTitle($questionGUI->object->getTitle());

                $questionGUI->object->setShuffle(false); // dirty, but works ^^
                $questionHTML = $questionGUI->getSolutionOutput(0, 0, false, false, true, false, true, false, true);
                $pageGUI->setQuestionHTML(array($questionGUI->object->getId() => $questionHTML));

                $pageHTML = $pageGUI->presentation();
                $pageHTML = preg_replace("/src=\"\\.\\//ims", "src=\"" . ILIAS_HTTP_PATH . "/", $pageHTML);

                return $pageHTML;
        }

        private function buildQuestionSkillAssignment($questionId, $skillBaseId, $skillTrefId)
        {
                require_once 'Modules/TestQuestionPool/classes/class.ilAssQuestionSkillAssignment.php';
                
                $assignment = new ilAssQuestionSkillAssignment($this->db);
                
                $assignment->setParentObjId($this->getQuestionContainerId());
                $assignment->setQuestionId($questionId);
                $assignment->setSkillBaseId($skillBaseId);
                $assignment->setSkillTrefId($skillTrefId);
                
                $assignment->loadFromDb();
                $assignment->loadAdditionalSkillData();
                
                return $assignment;
        }

        private function isTestQuestion($questionId)
        {
                return $this->questionList->isInList($questionId);
        }

        private function checkSolutionCompareExpressionInput(ilLogicalAnswerComparisonExpressionInputGUI $input, assQuestion $question)
        {
                $errors = array();

                foreach($input->getValues() as $expression)
                {
                        $result = $this->validateSolutionCompareExpression($expression, $question);

                        if( $result !== true )
                        {
                                $errors[] = "{$this->lng->txt('ass_lac_expression')} {$expression->getOrderIndex()}: {$result}";
                        }
                }

                if( count($errors) )
                {
                        $alert = $this->lng->txt('ass_lac_validation_error');
                        $alert .= '<br />'.implode('<br />', $errors);
                        $input->setAlert($alert);
                        return false;
                }

                return true;
        }

        private function validateSolutionCompareExpression(ilAssQuestionSolutionComparisonExpression $expression, iQuestionCondition $question)
        {
                require_once 'Modules/TestQuestionPool/classes/questions/LogicalAnswerCompare/ilAssLacConditionParser.php';
                require_once 'Modules/TestQuestionPool/classes/questions/LogicalAnswerCompare/ilAssLacQuestionProvider.php';
                require_once 'Modules/TestQuestionPool/classes/questions/LogicalAnswerCompare/ilAssLacCompositeValidator.php';

                try
                {
                        $conditionParser = new ilAssLacConditionParser();
                        $conditionComposite = $conditionParser->parse($expression->getExpression());
                        $questionProvider = new ilAssLacQuestionProvider();
                        $questionProvider->setQuestion($question);
                        $conditionValidator = new ilAssLacCompositeValidator($questionProvider);

                        $conditionValidator->validate($conditionComposite);
                }
                catch (ilAssLacException $e)
                {
                        if( $e instanceof ilAssLacFormAlertProvider )
                        {
                                return $e->getFormAlert($this->lng);
                        }
                        
                        throw $e;
                }

                return true;
        }

        private function keepAssignmentParameters()
        {
                $this->ctrl->saveParameter($this, 'question_id');
                $this->ctrl->saveParameter($this, 'skill_base_id');
                $this->ctrl->saveParameter($this, 'skill_tref_id');
        }
        
        private function orderQuestionData($questionData)
        {
                $orderedQuestionsData = array();

                if( $this->getQuestionOrderSequence() )
                {
                        foreach($this->getQuestionOrderSequence() as $questionId)
                        {
                                $orderedQuestionsData[$questionId] = $questionData[$questionId];
                        }
                        
                        return $orderedQuestionsData;
                }

                foreach($questionData as $questionId => $data)
                {
                        $orderedQuestionsData[$questionId] = $data['title'];
                }

                $orderedQuestionsData = $this->sortAlphabetically($orderedQuestionsData);
                
                foreach($orderedQuestionsData as $questionId => $questionTitle)
                {
                        $orderedQuestionsData[$questionId] = $questionData[$questionId];
                }
                
                return $orderedQuestionsData;
        }
        
        private function handleAssignmentConfigurationHintMessage()
        {
                if( $this->getAssignmentConfigurationHintMessage() )
                {
                        ilUtil::sendInfo($this->getAssignmentConfigurationHintMessage());
                }
        }

        private function getSkillSelectorHeader($questionId)
        {
                $questionData = $this->questionList->getDataArrayForQuestionId($questionId);
                
                return sprintf($this->lng->txt('qpl_qst_skl_selection_for_question_header'), $questionData['title']);
        }
        
        private function sortAlphabetically($array)
        {
                $flags = SORT_REGULAR;

                if( defined('SORT_NATURAL') )
                {
                        $flags = SORT_NATURAL;
                }
                elseif( defined('SORT_STRING') )
                {
                        $flags = SORT_STRING;
                }
                
                if( defined('SORT_FLAG_CASE') )
                {
                        $flags = $flags | SORT_FLAG_CASE;
                }
                
                asort($array, $flags);
                
                return $array;
        }

        protected function doesObjectTypeMatch($objectId)
        {
                return ilObject::_lookupType($objectId) == 'qpl';
        }

        private function buildLacLegendHTML(assQuestion $questionOBJ, ilAssQuestionSkillAssignment $assignment)
        {
                if( $questionOBJ instanceof iQuestionCondition )
                {
                        require_once 'Modules/TestQuestionPool/classes/questions/LogicalAnswerCompare/class.ilAssLacLegendGUI.php';
                        $legend = new ilAssLacLegendGUI($this->lng, $this->tpl);
                        $legend->setQuestionOBJ($questionOBJ);
                        $legend->setInitialVisibilityEnabled($assignment->hasEvalModeBySolution());
                        $lacLegendHTML = $this->ctrl->getHTML($legend);
                        return $lacLegendHTML;
                }
                
                return '';
        }
}