class.assTextQuestion.php

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

require_once './Modules/TestQuestionPool/classes/class.assQuestion.php';
require_once './Modules/Test/classes/inc.AssessmentConstants.php';
require_once './Modules/TestQuestionPool/interfaces/interface.ilObjQuestionScoringAdjustable.php';
require_once './Modules/TestQuestionPool/interfaces/interface.ilObjAnswerScoringAdjustable.php';

class assTextQuestion extends assQuestion implements ilObjQuestionScoringAdjustable, ilObjAnswerScoringAdjustable
{
        var $maxNumOfChars;

        var $keywords;

        var $answers;

        var $text_rating;

        /* method for automatic string matching */
        private $matchcondition;

        public $keyword_relation = 'any';

        public function __construct(
                $title = "",
                $comment = "",
                $author = "",
                $owner = -1,
                $question = ""
        )
        {
                parent::__construct($title, $comment, $author, $owner, $question);
                $this->maxNumOfChars = 0;
                $this->points = 1;
                $this->answers = array();
                $this->matchcondition = 0;
        }

        public function isComplete()
        {
                if (strlen($this->title) 
                        && $this->author 
                        && $this->question 
                        && $this->getMaximumPoints() > 0
                )
                {
                        return true;
                }
                return false;
        }

        public function saveToDb($original_id = "")
        {
                $this->saveQuestionDataToDb($original_id);
                $this->saveAdditionalQuestionDataToDb();
                $this->saveAnswerSpecificDataToDb();
                parent::saveToDb($original_id);
        }

        function loadFromDb($question_id)
        {
                global $ilDB;

                $result = $ilDB->queryF("SELECT qpl_questions.*, " . $this->getAdditionalTableName() . ".* FROM qpl_questions LEFT JOIN " . $this->getAdditionalTableName() . " ON " . $this->getAdditionalTableName() . ".question_fi = qpl_questions.question_id WHERE qpl_questions.question_id = %s",
                        array("integer"),
                        array($question_id)
                );
                if ($ilDB->numRows($result) == 1)
                {
                        $data = $ilDB->fetchAssoc($result);
                        $this->setId($question_id);
                        $this->setObjId($data["obj_fi"]);
                        $this->setTitle($data["title"]);
                        $this->setComment($data["description"]);
                        $this->setOriginalId($data["original_id"]);
                        $this->setNrOfTries($data['nr_of_tries']);
                        $this->setAuthor($data["author"]);
                        $this->setPoints((float) $data["points"]);
                        $this->setOwner($data["owner"]);
                        include_once("./Services/RTE/classes/class.ilRTE.php");
                        $this->setQuestion(ilRTE::_replaceMediaObjectImageSrc($data["question_text"], 1));
                        $this->setShuffle($data["shuffle"]);
                        $this->setMaxNumOfChars($data["maxnumofchars"]);
                        $this->setTextRating($this->isValidTextRating($data["textgap_rating"]) ? $data["textgap_rating"] : TEXTGAP_RATING_CASEINSENSITIVE);
                        $this->matchcondition = (strlen($data['matchcondition'])) ? $data['matchcondition'] : 0;
                        $this->setEstimatedWorkingTime(substr($data["working_time"], 0, 2), substr($data["working_time"], 3, 2), substr($data["working_time"], 6, 2));
                        $this->setKeywordRelation(($data['keyword_relation']));
                        
                        try
                        {
                                $this->setAdditionalContentEditingMode($data['add_cont_edit_mode']);
                        }
                        catch(ilTestQuestionPoolException $e)
                        {
                        }
                }

                $result = $ilDB->queryF("SELECT * FROM qpl_a_essay WHERE question_fi = %s",
                                                                array("integer"),
                                                                array($this->getId())
                );
                
                $this->flushAnswers();
                while ($row = $ilDB->fetchAssoc($result))
                {
                        $this->addAnswer($row['answertext'], $row['points']);
                }
                
                parent::loadFromDb($question_id);
        }

        function duplicate($for_test = true, $title = "", $author = "", $owner = "", $testObjId = null)
        {
                if ($this->id <= 0)
                {
                        // The question has not been saved. It cannot be duplicated
                        return;
                }
                // duplicate the question in database
                $this_id = $this->getId();
                $thisObjId = $this->getObjId();
                
                $clone = $this;
                include_once ("./Modules/TestQuestionPool/classes/class.assQuestion.php");
                $original_id = assQuestion::_getOriginalId($this->id);
                $clone->id = -1;
                
                if( (int)$testObjId > 0 )
                {
                        $clone->setObjId($testObjId);
                }
                
                if ($title)
                {
                        $clone->setTitle($title);
                }

                if ($author)
                {
                        $clone->setAuthor($author);
                }
                if ($owner)
                {
                        $clone->setOwner($owner);
                }

                if ($for_test)
                {
                        $clone->saveToDb($original_id);
                }
                else
                {
                        $clone->saveToDb();
                }

                // copy question page content
                $clone->copyPageOfQuestion($this_id);
                // copy XHTML media objects
                $clone->copyXHTMLMediaObjectsOfQuestion($this_id);
                #$clone->duplicateAnswers($this_id);
                
                $clone->onDuplicate($thisObjId, $this_id, $clone->getObjId(), $clone->getId());

                return $clone->id;
        }

        function copyObject($target_questionpool_id, $title = "")
        {
                if ($this->id <= 0)
                {
                        // The question has not been saved. It cannot be duplicated
                        return;
                }
                // duplicate the question in database
                $clone = $this;
                include_once ("./Modules/TestQuestionPool/classes/class.assQuestion.php");
                $original_id = assQuestion::_getOriginalId($this->id);
                $clone->id = -1;
                $source_questionpool_id = $this->getObjId();
                $clone->setObjId($target_questionpool_id);
                if ($title)
                {
                        $clone->setTitle($title);
                }
                $clone->saveToDb();
                // copy question page content
                $clone->copyPageOfQuestion($original_id);
                // copy XHTML media objects
                $clone->copyXHTMLMediaObjectsOfQuestion($original_id);
                // duplicate answers
                #$clone->duplicateAnswers($original_id);
                
                $clone->onCopy($source_questionpool_id, $original_id, $clone->getObjId(), $clone->getId());

                return $clone->id;
        }

        public function createNewOriginalFromThisDuplicate($targetParentId, $targetQuestionTitle = "")
        {
                if ($this->id <= 0)
                {
                        // The question has not been saved. It cannot be duplicated
                        return;
                }

                include_once ("./Modules/TestQuestionPool/classes/class.assQuestion.php");

                $sourceQuestionId = $this->id;
                $sourceParentId = $this->getObjId();

                // duplicate the question in database
                $clone = $this;
                $clone->id = -1;

                $clone->setObjId($targetParentId);

                if ($targetQuestionTitle)
                {
                        $clone->setTitle($targetQuestionTitle);
                }

                $clone->saveToDb();
                // copy question page content
                $clone->copyPageOfQuestion($sourceQuestionId);
                // copy XHTML media objects
                $clone->copyXHTMLMediaObjectsOfQuestion($sourceQuestionId);
                // duplicate answers
                #$clone->duplicateAnswers($sourceQuestionId);

                $clone->onCopy($sourceParentId, $sourceQuestionId, $clone->getObjId(), $clone->getId());

                return $clone->id;
        }

        function getMaxNumOfChars()
        {
                if (strcmp($this->maxNumOfChars, "") == 0)
                {
                        return 0;
                }
                else
                {
                        return $this->maxNumOfChars;
                }
        }

        function setMaxNumOfChars($maxchars = 0)
        {
                $this->maxNumOfChars = $maxchars;
        }

        function getMaximumPoints()
        {
                if( in_array($this->getKeywordRelation(), self::getScoringModesWithPointsByQuestion()) )
                {
                        return parent::getPoints();
                }
                
                $points = 0;
                
                foreach ($this->answers as $answer)
                {
                        if ($answer->getPoints() > 0)
                        {
                                $points = $points + $answer->getPoints();
                        }
                }
                
                return $points;
        }
        
        function getMinimumPoints()
        {
                if( in_array($this->getKeywordRelation(), self::getScoringModesWithPointsByQuestion()) )
                {
                        return 0;
                }
                
                $points = 0;

                foreach ($this->answers as $answer)
                {
                        if ($answer->getPoints() < 0)
                        {
                                $points = $points + $answer->getPoints();
                        }
                }

                return $points;
        }
        function setReachedPoints($active_id, $points, $pass = NULL)
        {
                global $ilDB;
                
                if (($points > 0) && ($points <= $this->getPoints()))
                {
                        if (is_null($pass))
                        {
                                $pass = $this->getSolutionMaxPass($active_id);
                        }
                        $affectedRows = $ilDB->manipulateF("UPDATE tst_test_result SET points = %s WHERE active_fi = %s AND question_fi = %s AND pass = %s",
                                array('float','integer','integer','integer'),
                                array($points, $active_id, $this->getId(), $pass)
                        );
                        $this->_updateTestPassResults($active_id, $pass);
                        return TRUE;
                }
                        else
                {
                        return TRUE;
                }
        }
        
        private function isValidTextRating($textRating)
        {
                switch($textRating)
                {
                        case TEXTGAP_RATING_CASEINSENSITIVE:
                        case TEXTGAP_RATING_CASESENSITIVE:
                        case TEXTGAP_RATING_LEVENSHTEIN1:
                        case TEXTGAP_RATING_LEVENSHTEIN2:
                        case TEXTGAP_RATING_LEVENSHTEIN3:
                        case TEXTGAP_RATING_LEVENSHTEIN4:
                        case TEXTGAP_RATING_LEVENSHTEIN5:
                                return true;
                }
                
                return false;
        }

        function isKeywordMatching($answertext, $a_keyword)
        {
                $result = FALSE;
                $textrating = $this->getTextRating();
                include_once "./Services/Utilities/classes/class.ilStr.php";
                switch ($textrating)
                {
                        case TEXTGAP_RATING_CASEINSENSITIVE:
                                if (ilStr::strPos(ilStr::strToLower($answertext), ilStr::strToLower($a_keyword)) !== false) return TRUE;
                                break;
                        case TEXTGAP_RATING_CASESENSITIVE:
                                if (ilStr::strPos($answertext, $a_keyword) !== false) return TRUE;
                                break;
                }
                
                // "<p>red</p>" would not match "red" even with distance of 5
                $answertext = strip_tags($answertext);
                
                $answerwords = array();
                if (preg_match_all("/([^\s.]+)/", $answertext, $matches))
                {
                        foreach ($matches[1] as $answerword)
                        {
                                array_push($answerwords, trim($answerword));
                        }
                }
                foreach ($answerwords as $a_original)
                {
                        switch ($textrating)
                        {
                                case TEXTGAP_RATING_LEVENSHTEIN1:
                                        if (levenshtein($a_original, $a_keyword) <= 1) return TRUE;
                                        break;
                                case TEXTGAP_RATING_LEVENSHTEIN2:
                                        if (levenshtein($a_original, $a_keyword) <= 2) return TRUE;
                                        break;
                                case TEXTGAP_RATING_LEVENSHTEIN3:
                                        if (levenshtein($a_original, $a_keyword) <= 3) return TRUE;
                                        break;
                                case TEXTGAP_RATING_LEVENSHTEIN4:
                                        if (levenshtein($a_original, $a_keyword) <= 4) return TRUE;
                                        break;
                                case TEXTGAP_RATING_LEVENSHTEIN5:
                                        if (levenshtein($a_original, $a_keyword) <= 5) return TRUE;
                                        break;
                        }
                }
                return $result;
        }
        
        protected function calculateReachedPointsForSolution($solution)
        {
                // Return min points when keyword relation is NON KEYWORDS
                if( $this->getKeywordRelation() == 'non' )
                {
                        return $this->getMinimumPoints();
                }

                // Return min points if there are no answers present.
                $answers = $this->getAnswers();

                if (count($answers) == 0)
                {
                        return $this->getMinimumPoints();
                }
                
                switch( $this->getKeywordRelation() )
                {
                        case 'any':

                                $points = 0;

                                foreach ($answers as $answer)
                                {
                                        $qst_answer  = $answer->getAnswertext();
                                        $user_answer = '  '.$solution;

                                        if( $this->isKeywordMatching( $user_answer, $qst_answer ) )
                                        {
                                                $points += $answer->getPoints();
                                        }
                                }

                                break;

                        case 'all':

                                $points = $this->getMaximumPoints();

                                foreach ($answers as $answer)
                                {
                                        $qst_answer  = $answer->getAnswertext();
                                        $user_answer = '  '.$solution;

                                        if( !$this->isKeywordMatching( $user_answer, $qst_answer ) )
                                        {
                                                $points = 0;
                                                break;
                                        }
                                }

                                break;

                        case 'one':

                                $points = 0;

                                foreach ($answers as $answer)
                                {
                                        $qst_answer  = $answer->getAnswertext();
                                        $user_answer = '  '.$solution;

                                        if( $this->isKeywordMatching( $user_answer, $qst_answer ) )
                                        {
                                                $points = $this->getMaximumPoints();
                                                break;
                                        }
                                }

                                break;
                }

                return $points;
        }

        public function calculateReachedPoints($active_id, $pass = NULL, $returndetails = FALSE)
        {
                if( $returndetails )
                {
                        throw new ilTestException('return details not implemented for '.__METHOD__);
                }
                
                global $ilDB;

                $points = 0;
                if (is_null($pass))
                {
                        $pass = $this->getSolutionMaxPass($active_id);
                }
                
                $result = $ilDB->queryF("SELECT * FROM tst_solutions WHERE active_fi = %s AND question_fi = %s AND pass = %s",
                        array('integer','integer','integer'),
                        array($active_id, $this->getId(), $pass)
                );
                
                // Return min points when no answer was given.
                if ($ilDB->numRows($result) == 0)
                {
                        return $this->getMinimumPoints();
                }
                
                // Return points of points are already on the row.
                $row = $ilDB->fetchAssoc($result);
                if ($row["points"] != NULL)
                {
                        return $row["points"];
                }

                return $this->calculateReachedPointsForSolution($row['value1']);
        }

        public function saveWorkingData($active_id, $pass = NULL)
        {
                global $ilDB;
                global $ilUser;

                include_once "./Services/Utilities/classes/class.ilStr.php";
                if (is_null($pass))
                {
                        include_once "./Modules/Test/classes/class.ilObjTest.php";
                        $pass = ilObjTest::_getPass($active_id);
                }

                $this->getProcessLocker()->requestUserSolutionUpdateLock();

                $affectedRows = $ilDB->manipulateF("DELETE FROM tst_solutions WHERE active_fi = %s AND question_fi = %s AND pass = %s",
                        array('integer','integer','integer'),
                        array($active_id, $this->getId(), $pass)
                );
                
                $text = $this->getSolutionSubmit();
                
                $entered_values = 0;
                if (strlen($text))
                {
                        $next_id = $ilDB->nextId('tst_solutions');
                        $affectedRows = $ilDB->insert("tst_solutions", array(
                                "solution_id" => array("integer", $next_id),
                                "active_fi" => array("integer", $active_id),
                                "question_fi" => array("integer", $this->getId()),
                                "value1" => array("clob", trim($text)),
                                "value2" => array("clob", null),
                                "pass" => array("integer", $pass),
                                "tstamp" => array("integer", time())
                        ));
                        $entered_values++;
                }

                $this->getProcessLocker()->releaseUserSolutionUpdateLock();

                if ($entered_values)
                {
                        include_once ("./Modules/Test/classes/class.ilObjAssessmentFolder.php");
                        if (ilObjAssessmentFolder::_enabledAssessmentLogging())
                        {
                                $this->logAction($this->lng->txtlng("assessment", "log_user_entered_values", ilObjAssessmentFolder::_getLogLanguage()), $active_id, $this->getId());
                        }
                }
                else
                {
                        include_once ("./Modules/Test/classes/class.ilObjAssessmentFolder.php");
                        if (ilObjAssessmentFolder::_enabledAssessmentLogging())
                        {
                                $this->logAction($this->lng->txtlng("assessment", "log_user_not_entered_values", ilObjAssessmentFolder::_getLogLanguage()), $active_id, $this->getId());
                        }
                }
                
                return true;
        }

        public function getSolutionSubmit()
        {
                $text = ilUtil::stripSlashes($_POST["TEXT"], FALSE);
                if($this->getMaxNumOfChars())
                {
                        include_once "./Services/Utilities/classes/class.ilStr.php";
                        $text_without_tags = preg_replace("/<[^>*?]>/is", "", $text);
                        $len_with_tags = ilStr::strLen($text);
                        $len_without_tags = ilStr::strLen($text_without_tags);
                        if($this->getMaxNumOfChars() < $len_without_tags)
                        {
                                if(!$this->isHTML($text))
                                {
                                        $text = ilStr::subStr($text, 0, $this->getMaxNumOfChars());
                                }
                        }
                }
                if($this->isHTML($text))
                {
                        $text = preg_replace("/<[^>]*$/ims", "", $text);
                        return $text;
                } else
                {
                        //$text = htmlentities($text, ENT_QUOTES, "UTF-8");
                }
                return $text;
        }

        public function saveAdditionalQuestionDataToDb()
        {
                global $ilDB;
                $ilDB->manipulateF( "DELETE FROM " . $this->getAdditionalTableName() . " WHERE question_fi = %s",
                                                        array( "integer" ),
                                                        array( $this->getId() 
                                                        )
                );

                $ilDB->manipulateF( "INSERT INTO " . $this->getAdditionalTableName() . " (question_fi, maxnumofchars, keywords, 
                                                         textgap_rating, matchcondition, keyword_relation) VALUES (%s, %s, %s, %s, %s, %s)",
                                                        array( "integer", "integer", "text", "text", 'integer', 'text' ),
                                                        array(
                                                                $this->getId(),
                                                                $this->getMaxNumOfChars(),
                                                                NULL,
                                                                $this->getTextRating(),
                                                                $this->matchcondition,
                                                                $this->getKeywordRelation()
                                                        )
                );
        }

        public function saveAnswerSpecificDataToDb()
        {
                global $ilDB;

                $ilDB->manipulateF( "DELETE FROM qpl_a_essay WHERE question_fi = %s",
                                                        array( "integer" ),
                                                        array( $this->getId() )
                );

                foreach ($this->answers as $answer)
                {
                        $nextID = $ilDB->nextId( 'qpl_a_essay' );
                        $ilDB->manipulateF( "INSERT INTO qpl_a_essay (answer_id, question_fi, answertext, points) VALUES (%s, %s, %s, %s)",
                                                                array( "integer", "integer", "text", 'float' ),
                                                                array(
                                                                        $nextID,
                                                                        $this->getId(),
                                                                        $answer->getAnswertext(),
                                                                        $answer->getPoints()
                                                                )
                        );
                }
        }

        protected function reworkWorkingData($active_id, $pass, $obligationsAnswered)
        {
                // nothing to rework!
        }

        function createRandomSolution($test_id, $user_id)
        {
        }

        function getQuestionType()
        {
                return "assTextQuestion";
        }

        function getTextRating()
        {
                return $this->text_rating;
        }
        
        function setTextRating($a_text_rating)
        {
                switch ($a_text_rating)
                {
                        case TEXTGAP_RATING_CASEINSENSITIVE:
                        case TEXTGAP_RATING_CASESENSITIVE:
                        case TEXTGAP_RATING_LEVENSHTEIN1:
                        case TEXTGAP_RATING_LEVENSHTEIN2:
                        case TEXTGAP_RATING_LEVENSHTEIN3:
                        case TEXTGAP_RATING_LEVENSHTEIN4:
                        case TEXTGAP_RATING_LEVENSHTEIN5:
                                $this->text_rating = $a_text_rating;
                                break;
                        default:
                                $this->text_rating = TEXTGAP_RATING_CASEINSENSITIVE;
                                break;
                }
        }
        
        function getAdditionalTableName()
        {
                return "qpl_qst_essay";
        }

        function getRTETextWithMediaObjects()
        {
                return parent::getRTETextWithMediaObjects();
        }

        public function setExportDetailsXLS(&$worksheet, $startrow, $active_id, $pass, &$format_title, &$format_bold)
        {
                include_once ("./Services/Excel/classes/class.ilExcelUtils.php");
                $solutions = $this->getSolutionValues($active_id, $pass);
                $worksheet->writeString($startrow, 0, ilExcelUtils::_convert_text($this->lng->txt($this->getQuestionType())), $format_title);
                $worksheet->writeString($startrow, 1, ilExcelUtils::_convert_text($this->getTitle()), $format_title);
                $i = 1;
                $worksheet->writeString($startrow + $i, 0, ilExcelUtils::_convert_text($this->lng->txt("result")), $format_bold);
                if (strlen($solutions[0]["value1"]))
                {
                        $worksheet->write($startrow + $i, 1, ilExcelUtils::_convert_text($solutions[0]["value1"]));
                }
                $i++;
                return $startrow + $i + 1;
        }
        
        public function toJSON()
        {
                include_once("./Services/RTE/classes/class.ilRTE.php");
                $result = array();
                $result['id'] = (int) $this->getId();
                $result['type'] = (string) $this->getQuestionType();
                $result['title'] = (string) $this->getTitle();
                $result['question'] =  $this->formatSAQuestion($this->getQuestion());
                $result['nr_of_tries'] = (int) $this->getNrOfTries();
                $result['shuffle'] = (bool) $this->getShuffle();
                $result['maxlength'] = (int) $this->getMaxNumOfChars();
                return json_encode($result);
        }

        public function getAnswerCount()
        {
                return count($this->answers);
        }

        public function addAnswer(
                $answertext = "",
                $points = 0.0,
                $points_unchecked = 0.0,
                $order = 0,
                $answerimage = ""
        )
        {
                include_once "./Modules/TestQuestionPool/classes/class.assAnswerMultipleResponseImage.php";

                        // add answer
                        $answer = new ASS_AnswerMultipleResponseImage($answertext, $points);
                        $this->answers[] = $answer;
        }
        
        public function getAnswers()
        {
                return $this->answers; 
        }

        function getAnswer($index = 0)
        {
                if ($index < 0) return NULL;
                if (count($this->answers) < 1) return NULL;
                if ($index >= count($this->answers)) return NULL;

                return $this->answers[$index];
        }

        function deleteAnswer($index = 0)
        {
                if ($index < 0) return;
                if (count($this->answers) < 1) return;
                if ($index >= count($this->answers)) return;
                $answer = $this->answers[$index];
                if (strlen($answer->getImage())) $this->deleteImage($answer->getImage());
                unset($this->answers[$index]);
                $this->answers = array_values($this->answers);
                for ($i = 0; $i < count($this->answers); $i++)
                {
                        if ($this->answers[$i]->getOrder() > $index)
                        {
                                $this->answers[$i]->setOrder($i);
                        }
                }
        }

        function getAnswerTableName()
        {
                return 'qpl_a_essay';
        }

        function flushAnswers()
        {
                $this->answers = array();
        }

        public function setAnswers($answers)
        {
                if( isset($answers['answer']) )
                {
                        $count = count($answers['answer']);
                        $withPoints = true;
                }
                else
                {
                        $count = count($answers);
                        $withPoints = false;
                }
                
                $this->flushAnswers();
                
                for( $i = 0; $i < $count; $i++ )
                {
                        if($withPoints)
                        {
                                $this->addAnswer($answers['answer'][$i], $answers['points'][$i]);
                        }
                        else
                        {
                                $this->addAnswer($answers[$i], 0);
                        }
                }
        }

        public function duplicateAnswers($original_id)
        {
                global $ilDB;

                $result = $ilDB->queryF("SELECT * FROM qpl_a_essay WHERE question_fi = %s",
                                                                array('integer'),
                                                                array($original_id)
                );
                if ($result->numRows())
                {
                        while ($row = $ilDB->fetchAssoc($result))
                        {
                                $next_id = $ilDB->nextId('qpl_a_essay');
                                $affectedRows = $ilDB->manipulateF(
                                        "INSERT INTO qpl_a_essay (answer_id, question_fi, answertext, points) 
                                         VALUES (%s, %s, %s, %s)",
                                         array('integer','integer','text','float'),
                                         array($next_id, $this->getId(), $row["answertext"], $row["points"])
                                );
                        }
                }               
        }

        public function getKeywordRelation()
        {
                return $this->keyword_relation;
        }

        public function setKeywordRelation($a_relation)
        {
                $this->keyword_relation = $a_relation;
        }
        
        public static function getValidScoringModes()
        {
                return array_merge(self::getScoringModesWithPointsByQuestion(), self::getScoringModesWithPointsByKeyword());
        }
        
        public static function getScoringModesWithPointsByQuestion()
        {
                return array('non', 'all', 'one');
        }
        
        public static function getScoringModesWithPointsByKeyword()
        {
                return array('any');
        }
        
        
        public function isAnswered($active_id, $pass)
        {
                $numExistingSolutionRecords = assQuestion::getNumExistingSolutionRecords($active_id, $pass, $this->getId());

                return $numExistingSolutionRecords > 0;
        }
        
        public static function isObligationPossible($questionId)
        {
                return true;
        }
}