class.assOrderingQuestion.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';
require_once './Modules/TestQuestionPool/interfaces/interface.iQuestionCondition.php';
require_once './Modules/TestQuestionPool/classes/class.ilUserQuestionResult.php';
 
require_once 'Modules/TestQuestionPool/classes/questions/class.ilAssOrderingElementList.php';
 
class assOrderingQuestion extends assQuestion implements ilObjQuestionScoringAdjustable, ilObjAnswerScoringAdjustable, iQuestionCondition
{
    const ORDERING_ELEMENT_FORM_FIELD_POSTVAR = 'order_elems';
    
    const ORDERING_ELEMENT_FORM_CMD_UPLOAD_IMG = 'uploadElementImage';
    const ORDERING_ELEMENT_FORM_CMD_REMOVE_IMG = 'removeElementImage';
    
    protected $orderingElementList;
    
    public $ordering_type;
 
    public $thumb_geometry = 100;
 
    public $element_height;
 
    public $old_ordering_depth = array();
    public $leveled_ordering = array();
 
    public function __construct(
        $title = "",
        $comment = "",
        $author = "",
        $owner = -1,
        $question = "",
        $ordering_type = OQ_TERMS
    ) {
        parent::__construct($title, $comment, $author, $owner, $question);
        $this->orderingElementList = new ilAssOrderingElementList();
        $this->ordering_type = $ordering_type;
    }
 
    public function isComplete()
    {
        if (!$this->getAuthor()) {
            return false;
        }
        
        if (!$this->getTitle()) {
            return false;
        }
        
        if (!$this->getQuestion()) {
            return false;
        }
        
        if (!$this->getMaximumPoints()) {
            return false;
        }
        
        if (!$this->getOrderingElementList()->countElements()) {
            return false;
        }
        
        return true;
    }
 
    public function saveToDb($original_id = "")
    {
        global $DIC;
        $ilDB = $DIC['ilDB'];
 
        $this->saveQuestionDataToDb($original_id);
        $this->saveAdditionalQuestionDataToDb();
        $this->saveAnswerSpecificDataToDb();
        parent::saveToDb($original_id);
    }
    
    public function loadFromDb($question_id)
    {
        global $DIC;
        $ilDB = $DIC['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 ($result->numRows() == 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"]);
            $this->setAuthor($data["author"]);
            $this->setNrOfTries($data['nr_of_tries']);
            $this->setPoints($data["points"]);
            $this->setOwner($data["owner"]);
            include_once("./Services/RTE/classes/class.ilRTE.php");
            $this->setQuestion(ilRTE::_replaceMediaObjectImageSrc($data["question_text"], 1));
            $this->ordering_type = strlen($data["ordering_type"]) ? $data["ordering_type"] : OQ_TERMS;
            $this->thumb_geometry = $data["thumb_geometry"];
            $this->element_height = $data["element_height"];
            $this->setEstimatedWorkingTime(substr($data["working_time"], 0, 2), substr($data["working_time"], 3, 2), substr($data["working_time"], 6, 2));
            
            try {
                $this->setAdditionalContentEditingMode($data['add_cont_edit_mode']);
            } catch (ilTestQuestionPoolException $e) {
            }
        }
        
        $this->orderingElementList->setQuestionId($this->getId());
        $this->orderingElementList->loadFromDb();
        
        parent::loadFromDb($question_id);
    }
    
    public 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();
        }
        
        $clone->duplicateOrderlingElementList();
 
        // copy question page content
        $clone->copyPageOfQuestion($this_id);
        // copy XHTML media objects
        $clone->copyXHTMLMediaObjectsOfQuestion($this_id);
        // duplicate the image
        $clone->duplicateImages($this_id, $thisObjId, $clone->getId(), $testObjId);
        
        $clone->onDuplicate($thisObjId, $this_id, $clone->getObjId(), $clone->getId());
        
        return $clone->id;
    }
    
    protected function duplicateOrderlingElementList()
    {
        $this->getOrderingElementList()->setQuestionId($this->getId());
        $this->getOrderingElementList()->distributeNewRandomIdentifiers();
        $this->getOrderingElementList()->saveToDb();
    }
 
    public 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 the image
        $clone->duplicateImages($original_id, $source_questionpool_id, $clone->getId(), $target_questionpool_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 the image
        $clone->duplicateImages($sourceQuestionId, $sourceParentId, $clone->getId(), $clone->getObjId());
 
        $clone->onCopy($sourceParentId, $sourceQuestionId, $clone->getObjId(), $clone->getId());
 
        return $clone->id;
    }
 
    public function duplicateImages($src_question_id, $src_object_id, $dest_question_id, $dest_object_id)
    {
        global $DIC;
        $ilLog = $DIC['ilLog'];
        if ($this->getOrderingType() == OQ_PICTURES || $this->getOrderingType() == OQ_NESTED_PICTURES) {
            $imagepath_original = $this->getImagePath($src_question_id, $src_object_id);
            $imagepath = $this->getImagePath($dest_question_id, $dest_object_id);
 
            if (!file_exists($imagepath)) {
                ilUtil::makeDirParents($imagepath);
            }
            foreach ($this->getOrderingElementList() as $element) {
                $filename = $element->getContent();
                if (!@copy($imagepath_original . $filename, $imagepath . $filename)) {
                    $ilLog->write("image could not be duplicated!!!!");
                }
                if (@file_exists($imagepath_original . $this->getThumbPrefix() . $filename)) {
                    if (!@copy($imagepath_original . $this->getThumbPrefix() . $filename, $imagepath . $this->getThumbPrefix() . $filename)) {
                        $ilLog->write("image thumbnail could not be duplicated!!!!");
                    }
                }
            }
        }
    }
    
    public function copyImages($question_id, $source_questionpool)
    {
        global $DIC;
        $ilLog = $DIC['ilLog'];
        if ($this->getOrderingType() == OQ_PICTURES) {
            $imagepath = $this->getImagePath();
            $imagepath_original = str_replace("/$this->id/images", "/$question_id/images", $imagepath);
            $imagepath_original = str_replace("/$this->obj_id/", "/$source_questionpool/", $imagepath_original);
            if (!file_exists($imagepath)) {
                ilUtil::makeDirParents($imagepath);
            }
            foreach ($this->getOrderingElementList() as $element) {
                $filename = $element->getContent();
                if (!@copy($imagepath_original . $filename, $imagepath . $filename)) {
                    $ilLog->write("Ordering Question image could not be copied: ${imagepath_original}${filename}");
                }
                if (@file_exists($imagepath_original . $this->getThumbPrefix() . $filename)) {
                    if (!@copy($imagepath_original . $this->getThumbPrefix() . $filename, $imagepath . $this->getThumbPrefix() . $filename)) {
                        $ilLog->write("Ordering Question image thumbnail could not be copied: $imagepath_original" . $this->getThumbPrefix() . $filename);
                    }
                }
            }
        }
    }
 
    public function setOrderingType($ordering_type = OQ_TERMS)
    {
        $this->ordering_type = $ordering_type;
    }
    
    public function getOrderingType()
    {
        return $this->ordering_type;
    }
    
    public function isOrderingTypeNested()
    {
        return in_array($this->getOrderingType(), array(OQ_NESTED_TERMS, OQ_NESTED_PICTURES));
    }
    
    public function isImageOrderingType()
    {
        return in_array($this->getOrderingType(), array(OQ_PICTURES, OQ_NESTED_PICTURES));
    }
    
    public function hasOrderingTypeUploadSupport()
    {
        return $this->getOrderingType() == OQ_PICTURES;
    }
    
    public function getOrderingElementListForSolutionOutput($forceCorrectSolution, $activeId, $passIndex, $getUseIntermediateSolution = false)
    {
        if ($forceCorrectSolution || !$activeId || $passIndex === null) {
            return $this->getOrderingElementList();
        }
        
        $solutionValues = $this->getSolutionValues($activeId, $passIndex, !$getUseIntermediateSolution);
        
        if (!count($solutionValues)) {
            return $this->getShuffledOrderingElementList();
        }
        
        return $this->getSolutionOrderingElementList($this->fetchIndexedValuesFromValuePairs($solutionValues));
    }
    
    public function getSolutionOrderingElementListForTestOutput(ilAssNestedOrderingElementsInputGUI $inputGUI, $lastPost, $activeId, $pass)
    {
        if ($inputGUI->isPostSubmit($lastPost)) {
            return $this->fetchSolutionListFromFormSubmissionData($lastPost);
        }
        
        // hey: prevPassSolutions - pass will be always available from now on
        #if( $pass === null && !ilObjTest::_getUsePreviousAnswers($activeId, true) )
        #// condition looks strange? yes - keep it null when previous solutions not enabled (!)
        #{
        #       $pass = ilObjTest::_getPass($activeId);
        #}
        // hey.
        
        $indexedSolutionValues = $this->fetchIndexedValuesFromValuePairs(
            // hey: prevPassSolutions - obsolete due to central check
            $this->getTestOutputSolutions($activeId, $pass)
            // hey.
        );
        
        if (count($indexedSolutionValues)) {
            return $this->getSolutionOrderingElementList($indexedSolutionValues);
        }
        
        return $this->getShuffledOrderingElementList();
    }
    
    protected function getSolutionValuePairBrandedOrderingElementByRandomIdentifier($value1, $value2)
    {
        $value2 = explode(':', $value2);
        
        $randomIdentifier = $value2[0];
        $selectedPosition = $value1;
        $selectedIndentation = $value2[1];
        
        $element = $this->getOrderingElementList()->getElementByRandomIdentifier($randomIdentifier)->getClone();
        
        $element->setPosition($selectedPosition);
        $element->setIndentation($selectedIndentation);
        
        return $element;
    }
    
    protected function getSolutionValuePairBrandedOrderingElementBySolutionIdentifier($value1, $value2)
    {
        $solutionIdentifier = $value1;
        $selectedPosition = ($value2 - 1);
        $selectedIndentation = 0;
        
        $element = $this->getOrderingElementList()->getElementBySolutionIdentifier($solutionIdentifier)->getClone();
        
        $element->setPosition($selectedPosition);
        $element->setIndentation($selectedIndentation);
        
        return $element;
    }
    
    public function getSolutionOrderingElementList($indexedSolutionValues)
    {
        $solutionOrderingList = new ilAssOrderingElementList();
        $solutionOrderingList->setQuestionId($this->getId());
        
        foreach ($indexedSolutionValues as $value1 => $value2) {
            if ($this->isOrderingTypeNested()) {
                $element = $this->getSolutionValuePairBrandedOrderingElementByRandomIdentifier($value1, $value2);
            } else {
                $element = $this->getSolutionValuePairBrandedOrderingElementBySolutionIdentifier($value1, $value2);
            }
            
            $solutionOrderingList->addElement($element);
        }
        
        if (!$this->getOrderingElementList()->hasSameElementSetByRandomIdentifiers($solutionOrderingList)) {
            throw new ilTestQuestionPoolException('inconsistent solution values given');
        }
        
        return $solutionOrderingList;
    }
    
    public function getShuffledOrderingElementList()
    {
        $shuffledRandomIdentifierIndex = $this->getShuffler()->shuffle(
            $this->getOrderingElementList()->getRandomIdentifierIndex()
        );
        
        $shuffledElementList = $this->getOrderingElementList()->getClone();
        $shuffledElementList->reorderByRandomIdentifiers($shuffledRandomIdentifierIndex);
        $shuffledElementList->resetElementsIndentations();
        
        return $shuffledElementList;
    }
    
    public function getOrderingElementList()
    {
        return $this->orderingElementList;
    }
    
    public function setOrderingElementList($orderingElementList)
    {
        $this->orderingElementList = $orderingElementList;
    }
    
    public function moveAnswerUp($position)
    {
        if (!$this->getOrderingElementList()->elementExistByPosition($position)) {
            return false;
        }
        
        if ($this->getOrderingElementList()->isFirstElementPosition($position)) {
            return false;
        }
        
        $this->getOrderingElementList()->moveElementByPositions($position, $position - 1);
    }
    
    public function moveAnswerDown($position)
    {
        if (!$this->getOrderingElementList()->elementExistByPosition($position)) {
            return false;
        }
        
        if ($this->getOrderingElementList()->isLastElementPosition($position)) {
            return false;
        }
        
        $this->getOrderingElementList()->moveElementByPositions($position, $position + 1);
        
        return true;
    }
    
    public function getAnswer($index = 0)
    {
        if (!$this->getOrderingElementList()->elementExistByPosition($index)) {
            return null;
        }
        
        return $this->getOrderingElementList()->getElementByPosition($index);
    }
 
    public function deleteAnswer($randomIdentifier)
    {
        $this->getOrderingElementList()->removeElement(
            $this->getOrderingElementList()->getElementByRandomIdentifier($randomIdentifier)
        );
        $this->getOrderingElementList()->saveToDb();
    }
 
    public function getAnswerCount()
    {
        return $this->getOrderingElementList()->countElements();
    }
 
    public function calculateReachedPoints($active_id, $pass = null, $authorizedSolution = true, $returndetails = false)
    {
        if ($returndetails) {
            throw new ilTestException('return details not implemented for ' . __METHOD__);
        }
        
        if (is_null($pass)) {
            $pass = $this->getSolutionMaxPass($active_id);
        }
        
        $solutionValuePairs = $this->getSolutionValues($active_id, $pass, $authorizedSolution);
        
        if (!count($solutionValuePairs)) {
            return 0;
        }
        
        $indexedSolutionValues = $this->fetchIndexedValuesFromValuePairs($solutionValuePairs);
        $solutionOrderingElementList = $this->getSolutionOrderingElementList($indexedSolutionValues);
        
        return $this->calculateReachedPointsForSolution($solutionOrderingElementList);
    }
    
    public function calculateReachedPointsFromPreviewSession(ilAssQuestionPreviewSession $previewSession)
    {
        if (!$previewSession->hasParticipantSolution()) {
            return 0;
        }
        
        $solutionOrderingElementList = unserialize(
            $previewSession->getParticipantsSolution()
        );
        
        $reachedPoints = $this->calculateReachedPointsForSolution($solutionOrderingElementList);
        $reachedPoints = $this->deductHintPointsFromReachedPoints($previewSession, $reachedPoints);
        
        return $this->ensureNonNegativePoints($reachedPoints);
    }
 
    public function getMaximumPoints()
    {
        return $this->getPoints();
    }
 
    /*
    * Returns the encrypted save filename of a matching picture
    * Images are saved with an encrypted filename to prevent users from
    * cheating by guessing the solution from the image filename
    *
    * @param string $filename Original filename
    * @return string Encrypted filename
    */
    public function getEncryptedFilename($filename)
    {
        $extension = "";
        if (preg_match("/.*\\.(\\w+)$/", $filename, $matches)) {
            $extension = $matches[1];
        }
        return md5($filename) . "." . $extension;
    }
    
    protected function cleanImagefiles()
    {
        if ($this->getOrderingType() == OQ_PICTURES) {
            if (@file_exists($this->getImagePath())) {
                $contents = ilUtil::getDir($this->getImagePath());
                foreach ($contents as $f) {
                    if (strcmp($f['type'], 'file') == 0) {
                        $found = false;
                        foreach ($this->getOrderingElementList() as $orderElement) {
                            if (strcmp($f['entry'], $orderElement->getContent()) == 0) {
                                $found = true;
                            }
                            if (strcmp($f['entry'], $this->getThumbPrefix() . $orderElement->getContent()) == 0) {
                                $found = true;
                            }
                        }
                        if (!$found) {
                            if (@file_exists($this->getImagePath() . $f['entry'])) {
                                @unlink($this->getImagePath() . $f['entry']);
                            }
                        }
                    }
                }
            }
        } else {
            if (@file_exists($this->getImagePath())) {
                ilUtil::delDir($this->getImagePath());
            }
        }
    }
 
    /*
    * Deletes an imagefile from the system if the file is deleted manually
    *
    * @param string $filename Image file filename
    * @return boolean Success
    */
    public function dropImageFile($imageFilename)
    {
        if (!strlen($imageFilename)) {
            return false;
        }
        
        $result = @unlink($this->getImagePath() . $imageFilename);
        $result = $result & @unlink($this->getImagePath() . $this->getThumbPrefix() . $imageFilename);
        
        return $result;
    }
    
    public function isImageFileStored($imageFilename)
    {
        if (!strlen($imageFilename)) {
            return false;
        }
        
        if (!file_exists($this->getImagePath() . $imageFilename)) {
            return false;
        }
        
        return is_file($this->getImagePath() . $imageFilename);
    }
    
    public function isImageReplaced(ilAssOrderingElement $newElement, ilAssOrderingElement $oldElement)
    {
        if (!$this->hasOrderingTypeUploadSupport()) {
            return false;
        }
        
        if (!$newElement->getContent()) {
            return false;
        }
        
        return $newElement->getContent() != $oldElement->getContent();
    }
 
    public function storeImageFile($uploadFile, $targetFile)
    {
        if (!strlen($uploadFile)) {
            return false;
        }
        
        $this->ensureImagePathExists();
        
        // store file with hashed name
        
        if (!ilUtil::moveUploadedFile($uploadFile, $targetFile, $this->getImagePath() . $targetFile)) {
            return false;
        }
 
        return true;
    }
    
    public function handleThumbnailCreation(ilAssOrderingElementList $elementList)
    {
        foreach ($elementList as $element) {
            $this->createImageThumbnail($element);
        }
    }
    
    public function createImageThumbnail(ilAssOrderingElement $element)
    {
        if ($this->getThumbGeometry()) {
            $imageFile = $this->getImagePath() . $element->getContent();
            $thumbFile = $this->getImagePath() . $this->getThumbPrefix() . $element->getContent();
            
            ilUtil::convertImage($imageFile, $thumbFile, "JPEG", $this->getThumbGeometry());
        }
    }
 
    public function validateSolutionSubmit()
    {
        $submittedSolutionList = $this->getSolutionListFromPostSubmit();
        
        if (!$submittedSolutionList->hasElements()) {
            return true;
        }
        
        return $this->getOrderingElementList()->hasSameElementSetByRandomIdentifiers($submittedSolutionList);
    }
 
    public function saveWorkingData($active_id, $pass = null, $authorized = true)
    {
        $entered_values = 0;
        
        if (is_null($pass)) {
            include_once "./Modules/Test/classes/class.ilObjTest.php";
            $pass = ilObjTest::_getPass($active_id);
        }
 
        $this->getProcessLocker()->executeUserSolutionUpdateLockOperation(
            function () use (&$entered_values, $active_id, $pass, $authorized) {
                $this->removeCurrentSolution($active_id, $pass, $authorized);
        
                foreach ($this->getSolutionListFromPostSubmit() as $orderingElement) {
                    $value1 = $orderingElement->getStorageValue1($this->getOrderingType());
                    $value2 = $orderingElement->getStorageValue2($this->getOrderingType());
                    
                    $this->saveCurrentSolution($active_id, $pass, $value1, trim($value2), $authorized);
                    
                    $entered_values++;
                }
            }
        );
        
        if ($entered_values) {
            $this->log($active_id, 'log_user_entered_values');
        } else {
            $this->log($active_id, 'log_user_not_entered_values');
        }
 
        return true;
    }
    
    protected function savePreviewData(ilAssQuestionPreviewSession $previewSession)
    {
        if ($this->validateSolutionSubmit()) {
            $previewSession->setParticipantsSolution(serialize($this->getSolutionListFromPostSubmit()));
        }
    }
 
    public function saveAdditionalQuestionDataToDb()
    {
        global $DIC;
        $ilDB = $DIC['ilDB'];
 
        // save additional data
        $ilDB->manipulateF(
            "DELETE FROM " . $this->getAdditionalTableName() . " WHERE question_fi = %s",
            array( "integer" ),
            array( $this->getId() )
        );
 
        $ilDB->manipulateF(
            "INSERT INTO " . $this->getAdditionalTableName() . " (question_fi, ordering_type, thumb_geometry, element_height) 
                                                        VALUES (%s, %s, %s, %s)",
            array( "integer", "text", "integer", "integer" ),
            array(
                                $this->getId(),
                                $this->ordering_type,
                                $this->getThumbGeometry(),
                                ($this->getElementHeight() > 20) ? $this->getElementHeight() : null
                            )
        );
    }
 
    public function saveAnswerSpecificDataToDb()
    {
        $this->getOrderingElementList()->setQuestionId($this->getId());
        $this->getOrderingElementList()->saveToDb();
        
        if ($this->hasOrderingTypeUploadSupport()) {
            $this->rebuildThumbnails();
            $this->cleanImagefiles();
        }
    }
 
    public function getQuestionType()
    {
        return "assOrderingQuestion";
    }
 
    public function getAdditionalTableName()
    {
        return "qpl_qst_ordering";
    }
 
    public function getAnswerTableName()
    {
        return "qpl_a_ordering";
    }
 
    public function getRTETextWithMediaObjects()
    {
        $text = parent::getRTETextWithMediaObjects();
        
        foreach ($this->getOrderingElementList() as $orderingElement) {
            $text .= $orderingElement->getContent();
        }
        
        return $text;
    }
    
    public function getOrderElements()
    {
        return $this->getOrderingElementList()->getRandomIdentifierIndexedElements();
    }
 
    public function supportsJavascriptOutput()
    {
        return true;
    }
    
    public function supportsNonJsOutput()
    {
        return false;
    }
 
    public function setExportDetailsXLS($worksheet, $startrow, $active_id, $pass)
    {
        parent::setExportDetailsXLS($worksheet, $startrow, $active_id, $pass);
 
        $solutions = $this->getSolutionValues($active_id, $pass);
        $sol = array();
        foreach ($solutions as $solution) {
            $sol[$solution["value1"]] = $solution["value2"];
        }
        asort($sol);
        $sol = array_keys($sol);
 
        $i = 1;
        foreach ($sol as $idx) {
            foreach ($solutions as $solution) {
                if ($solution["value1"] == $idx) {
                    $worksheet->setCell($startrow + $i, 0, $solution["value2"]);
                }
            }
            $element = $this->getOrderingElementList()->getElementBySolutionIdentifier($idx);
            $worksheet->setCell($startrow + $i, 1, $element->getContent());
            $i++;
        }
 
        return $startrow + $i + 1;
    }
 
    /*
    * Get the thumbnail geometry
    *
    * @return integer Geometry
    */
    public function getThumbGeometry()
    {
        return $this->thumb_geometry;
    }
    
    public function getThumbSize()
    {
        return $this->getThumbGeometry();
    }
 
    /*
    * Set the thumbnail geometry
    *
    * @param integer $a_geometry Geometry
    */
    public function setThumbGeometry($a_geometry)
    {
        $this->thumb_geometry = ($a_geometry < 1) ? 100 : $a_geometry;
    }
 
    /*
    * Get the minimum element height
    *
    * @return integer Height
    */
    public function getElementHeight()
    {
        return $this->element_height;
    }
    
    /*
    * Set the minimum element height
    *
    * @param integer $a_height Height
    */
    public function setElementHeight($a_height)
    {
        $this->element_height = ($a_height < 20) ? "" : $a_height;
    }
 
    /*
    * Rebuild the thumbnail images with a new thumbnail size
    */
    public function rebuildThumbnails()
    {
        if ($this->getOrderingType() == OQ_PICTURES || $this->getOrderingType() == OQ_NESTED_PICTURES) {
            foreach ($this->getOrderElements() as $orderingElement) {
                $this->generateThumbForFile($this->getImagePath(), $orderingElement->getContent());
            }
        }
    }
    
    public function getThumbPrefix()
    {
        return "thumb.";
    }
    
    protected function generateThumbForFile($path, $file)
    {
        $filename = $path . $file;
        if (@file_exists($filename)) {
            $thumbpath = $path . $this->getThumbPrefix() . $file;
            $path_info = @pathinfo($filename);
            $ext = "";
            switch (strtoupper($path_info['extension'])) {
                case 'PNG':
                    $ext = 'PNG';
                    break;
                case 'GIF':
                    $ext = 'GIF';
                    break;
                default:
                    $ext = 'JPEG';
                    break;
            }
            ilUtil::convertImage($filename, $thumbpath, $ext, $this->getThumbGeometry());
        }
    }
    
    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) true;
        $result['points'] = $this->getPoints();
        $result['feedback'] = array(
            'onenotcorrect' => $this->formatSAQuestion($this->feedbackOBJ->getGenericFeedbackTestPresentation($this->getId(), false)),
            'allcorrect' => $this->formatSAQuestion($this->feedbackOBJ->getGenericFeedbackTestPresentation($this->getId(), true))
        );
        if ($this->getOrderingType() == OQ_PICTURES) {
            $result['path'] = $this->getImagePathWeb();
        }
        
        $counter = 1;
        $answers = array();
        foreach ($this->getOrderingElementList() as $orderingElement) {
            $answers[$counter] = $orderingElement->getContent();
            $counter++;
        }
        $answers = $this->getShuffler()->shuffle($answers);
        $arr = array();
        foreach ($answers as $order => $answer) {
            array_push($arr, array(
                "answertext" => (string) $answer,
                "order" => (int) $order
            ));
        }
        $result['answers'] = $arr;
 
        $mobs = ilObjMediaObject::_getMobsOfObject("qpl:html", $this->getId());
        $result['mobs'] = $mobs;
 
        return json_encode($result);
    }
    
    public function buildOrderingElementInputGui()
    {
        switch ($this->getOrderingType()) {
            case OQ_TERMS:
                
                return $this->buildOrderingTextsInputGui();
                
            case OQ_PICTURES:
                
                return $this->buildOrderingImagesInputGui();
            
            case OQ_NESTED_TERMS:
            case OQ_NESTED_PICTURES:
                
                return $this->buildNestedOrderingElementInputGui();
                
            default:
                throw new ilTestQuestionPoolException('unknown ordering mode');
        }
    }
 
    public function initOrderingElementAuthoringProperties(ilFormPropertyGUI $formField)
    {
        switch (true) {
            case $formField instanceof ilAssNestedOrderingElementsInputGUI:
                
                $formField->setInteractionEnabled(true);
                $formField->setNestingEnabled($this->isOrderingTypeNested());
                break;
            
            case $formField instanceof ilAssOrderingTextsInputGUI:
            case $formField instanceof ilAssOrderingImagesInputGUI:
            default:
            
                $formField->setEditElementOccuranceEnabled(true);
                $formField->setEditElementOrderEnabled(true);
        }
        
        $formField->setRequired(true);
    }
    
    public function initOrderingElementFormFieldLabels(ilFormPropertyGUI $formField)
    {
        $formField->setInfo($this->lng->txt('ordering_answer_sequence_info'));
        $formField->setTitle($this->lng->txt('answers'));
    }
    
    public function buildOrderingTextsInputGui()
    {
        $formDataConverter = $this->buildOrderingTextsFormDataConverter();
        
        require_once 'Modules/TestQuestionPool/classes/forms/class.ilAssOrderingTextsInputGUI.php';
        
        $orderingElementInput = new ilAssOrderingTextsInputGUI(
            $formDataConverter,
            self::ORDERING_ELEMENT_FORM_FIELD_POSTVAR
        );
        
        $this->initOrderingElementFormFieldLabels($orderingElementInput);
        
        return $orderingElementInput;
    }
    
    public function buildOrderingImagesInputGui()
    {
        $formDataConverter = $this->buildOrderingImagesFormDataConverter();
        
        require_once 'Modules/TestQuestionPool/classes/forms/class.ilAssOrderingImagesInputGUI.php';
        
        $orderingElementInput = new ilAssOrderingImagesInputGUI(
            $formDataConverter,
            self::ORDERING_ELEMENT_FORM_FIELD_POSTVAR
        );
        
        $orderingElementInput->setImageRemovalCommand(self::ORDERING_ELEMENT_FORM_CMD_REMOVE_IMG);
        $orderingElementInput->setImageUploadCommand(self::ORDERING_ELEMENT_FORM_CMD_UPLOAD_IMG);
        
        $this->initOrderingElementFormFieldLabels($orderingElementInput);
        
        return $orderingElementInput;
    }
    
    public function buildNestedOrderingElementInputGui()
    {
        $formDataConverter = $this->buildNestedOrderingFormDataConverter();
        
        require_once 'Modules/TestQuestionPool/classes/forms/class.ilAssNestedOrderingElementsInputGUI.php';
        
        $orderingElementInput = new ilAssNestedOrderingElementsInputGUI(
            $formDataConverter,
            self::ORDERING_ELEMENT_FORM_FIELD_POSTVAR
        );
        
        $orderingElementInput->setUniquePrefix($this->getId());
        $orderingElementInput->setOrderingType($this->getOrderingType());
        $orderingElementInput->setElementImagePath($this->getImagePathWeb());
        $orderingElementInput->setThumbPrefix($this->getThumbPrefix());
        
        $this->initOrderingElementFormFieldLabels($orderingElementInput);
        
        return $orderingElementInput;
    }
    
    public function fetchSolutionListFromSubmittedForm(ilPropertyFormGUI $form)
    {
        return $form->getItemByPostVar(self::ORDERING_ELEMENT_FORM_FIELD_POSTVAR)->getElementList($this->getId());
    }
    
    public function fetchSolutionListFromFormSubmissionData($userSolutionPost)
    {
        $orderingGUI = $this->buildNestedOrderingElementInputGui();
        $orderingGUI->setContext(ilAssNestedOrderingElementsInputGUI::CONTEXT_USER_SOLUTION_SUBMISSION);
        $orderingGUI->setValueByArray($userSolutionPost);
        
        if (!$orderingGUI->checkInput()) {
            require_once 'Modules/Test/exceptions/class.ilTestException.php';
            throw new ilTestException('error on validating user solution post');
        }
        
        require_once 'Modules/TestQuestionPool/classes/questions/class.ilAssOrderingElementList.php';
        $solutionOrderingElementList = ilAssOrderingElementList::buildInstance($this->getId());
        
        $storedElementList = $this->getOrderingElementList();
        
        foreach ($orderingGUI->getElementList($this->getId()) as $submittedElement) {
            $solutionElement = $storedElementList->getElementByRandomIdentifier(
                $submittedElement->getRandomIdentifier()
            )->getClone();
            
            $solutionElement->setPosition($submittedElement->getPosition());
 
            if ($this->isOrderingTypeNested()) {
                $solutionElement->setIndentation($submittedElement->getIndentation());
            }
            
            $solutionOrderingElementList->addElement($solutionElement);
        }
        
        return $solutionOrderingElementList;
    }
    
    private $postSolutionOrderingElementList = null;
    
    public function getSolutionListFromPostSubmit()
    {
        if ($this->postSolutionOrderingElementList === null) {
            $list = $this->fetchSolutionListFromFormSubmissionData($_POST);
            $this->postSolutionOrderingElementList = $list;
        }
        
        return $this->postSolutionOrderingElementList;
    }
    
    public function getSolutionPostSubmit()
    {
        return $this->fetchSolutionSubmit($_POST);
    }
 
    protected function calculateReachedPointsForSolution(ilAssOrderingElementList $solutionOrderingElementList)
    {
        $reachedPoints = $this->getPoints();
 
        foreach ($this->getOrderingElementList() as $correctElement) {
            $userElement = $solutionOrderingElementList->getElementByPosition($correctElement->getPosition());
            
            if (!$correctElement->isSameElement($userElement)) {
                $reachedPoints = 0;
                break;
            }
        }
        
        return $reachedPoints;
    }
 
    /***
     * @param object    $child
     * @param integer   $ordering_depth
     * @param bool              $with_random_id
     */
    public function getLeveledOrdering()
    {
        return $this->leveled_ordering;
    }
 
    public function getOldLeveledOrdering()
    {
        global $DIC;
        $ilDB = $DIC['ilDB'];
 
        $res = $ilDB->queryF(
            'SELECT depth FROM qpl_a_ordering WHERE question_fi = %s ORDER BY position ASC',
            array('integer'),
            array($this->getId())
        );
        while ($row = $ilDB->fetchAssoc($res)) {
            $this->old_ordering_depth[] = $row['depth'];
        }
        return $this->old_ordering_depth;
    }
    
    /***
     * @param integer $a_random_id
     * @return integer
     */
    public function lookupSolutionOrderByRandomid($a_random_id)
    {
        global $DIC;
        $ilDB = $DIC['ilDB'];
        
        $res = $ilDB->queryF(
            'SELECT solution_key FROM qpl_a_ordering WHERE random_id = %s',
            array('integer'),
            array($a_random_id)
        );
        $row = $ilDB->fetchAssoc($res);
        
        return $row['solution_key'];
    }
 
    public function updateLeveledOrdering($a_index, $a_answer_text, $a_depth)
    {
        global $DIC;
        $ilDB = $DIC['ilDB'];
        
        $ilDB->update(
            'qpl_a_ordering',
            array('solution_key' => array('integer', $a_index),
              'depth' => array('integer', $a_depth)),
            array('answertext' => array('text', $a_answer_text))
        );
        
        
        return true;
    }
 
    public function getOperators($expression)
    {
        require_once "./Modules/TestQuestionPool/classes/class.ilOperatorsExpressionMapping.php";
        return ilOperatorsExpressionMapping::getOperatorsByExpression($expression);
    }
 
    public function getExpressionTypes()
    {
        return array(
            iQuestionCondition::PercentageResultExpression,
            iQuestionCondition::NumericResultExpression,
            iQuestionCondition::OrderingResultExpression,
            iQuestionCondition::EmptyAnswerExpression,
        );
    }
 
    public function getUserQuestionResult($active_id, $pass)
    {
        global $DIC;
        $ilDB = $DIC['ilDB'];
        $result = new ilUserQuestionResult($this, $active_id, $pass);
 
        $maxStep = $this->lookupMaxStep($active_id, $pass);
 
        if ($maxStep !== null) {
            $data = $ilDB->queryF(
                "SELECT value1, value2 FROM tst_solutions WHERE active_fi = %s AND pass = %s AND question_fi = %s AND step = %s ORDER BY value1 ASC ",
                array("integer", "integer", "integer","integer"),
                array($active_id, $pass, $this->getId(), $maxStep)
            );
        } else {
            $data = $ilDB->queryF(
                "SELECT value1, value2 FROM tst_solutions WHERE active_fi = %s AND pass = %s AND question_fi = %s ORDER BY value1 ASC ",
                array("integer", "integer", "integer"),
                array($active_id, $pass, $this->getId())
            );
        }
 
        $elements = array();
        while ($row = $ilDB->fetchAssoc($data)) {
            $newKey = explode(":", $row["value2"]);
 
            foreach ($this->getOrderingElementList() as $answer) {
                // Images nut supported
                if (!$this->isOrderingTypeNested()) {
                    if ($answer->getSolutionIdentifier() == $row["value1"]) {
                        $elements[$row["value2"]] = $answer->getSolutionIdentifier() + 1;
                        break;
                    }
                } else {
                    if ($answer->getRandomIdentifier() == $newKey[0]) {
                        $elements[$row["value1"]] = $answer->getSolutionIdentifier() + 1;
                        break;
                    }
                }
            }
        }
 
        ksort($elements);
 
        foreach (array_values($elements) as $element) {
            $result->addKeyValue($element, $element);
        }
 
        $points = $this->calculateReachedPoints($active_id, $pass);
        $max_points = $this->getMaximumPoints();
 
        $result->setReachedPercentage(($points / $max_points) * 100);
 
        return $result;
    }
 
    public function getAvailableAnswerOptions($index = null)
    {
        if ($index !== null) {
            return $this->getOrderingElementList()->getElementByPosition($index);
        }
 
        return $this->getOrderingElementList()->getElements();
    }
 
    protected function afterSyncWithOriginal($origQuestionId, $dupQuestionId, $origParentObjId, $dupParentObjId)
    {
        parent::afterSyncWithOriginal($origQuestionId, $dupQuestionId, $origParentObjId, $dupParentObjId);
        $this->duplicateImages($dupQuestionId, $dupParentObjId, $origQuestionId, $origParentObjId);
    }
 
    // fau: testNav - new function getTestQuestionConfig()
    // hey: refactored identifiers
    public function buildTestPresentationConfig()
    // hey.
    {
        // hey: refactored identifiers
        return parent::buildTestPresentationConfig()
        // hey.
            ->setIsUnchangedAnswerPossible(true)
            ->setUseUnchangedAnswerLabel($this->lng->txt('tst_unchanged_order_is_correct'));
    }
    // fau.
    
    protected function ensureImagePathExists()
    {
        if (!file_exists($this->getImagePath())) {
            ilUtil::makeDirParents($this->getImagePath());
        }
    }
    
    public function fetchSolutionSubmit($formSubmissionDataStructure)
    {
        $solutionSubmit = array();
        
        if (isset($formSubmissionDataStructure['orderresult'])) {
            $orderresult = $formSubmissionDataStructure['orderresult'];
            
            if (strlen($orderresult)) {
                $orderarray = explode(":", $orderresult);
                $ordervalue = 1;
                foreach ($orderarray as $index) {
                    $idmatch = null;
                    if (preg_match("/id_(\\d+)/", $index, $idmatch)) {
                        $randomid = $idmatch[1];
                        foreach ($this->getOrderingElementList() as $answeridx => $answer) {
                            if ($answer->getRandomIdentifier() == $randomid) {
                                $solutionSubmit[$answeridx] = $ordervalue;
                                $ordervalue++;
                            }
                        }
                    }
                }
            }
        } elseif ($this->getOrderingType() == OQ_NESTED_TERMS || $this->getOrderingType() == OQ_NESTED_PICTURES) {
            $index = 0;
            foreach ($formSubmissionDataStructure['content'] as $randomId => $content) {
                $indentation = $formSubmissionDataStructure['indentation'];
                
                $value1 = $index++;
                $value2 = implode(':', array($randomId, $indentation));
                
                $solutionSubmit[$value1] = $value2;
            }
        } else {
            foreach ($formSubmissionDataStructure as $key => $value) {
                $matches = null;
                if (preg_match("/^order_(\d+)/", $key, $matches)) {
                    if (!(preg_match("/initial_value_\d+/", $value))) {
                        if (strlen($value)) {
                            foreach ($this->getOrderingElementList() as $answeridx => $answer) {
                                if ($answer->getRandomIdentifier() == $matches[1]) {
                                    $solutionSubmit[$answeridx] = $value;
                                }
                            }
                        }
                    }
                }
            }
        }
        
        return $solutionSubmit;
    }
    
    protected function buildOrderingElementFormDataConverter()
    {
        require_once 'Modules/TestQuestionPool/classes/forms/class.ilAssOrderingFormValuesObjectsConverter.php';
        $converter = new ilAssOrderingFormValuesObjectsConverter();
        $converter->setPostVar(self::ORDERING_ELEMENT_FORM_FIELD_POSTVAR);
        
        return $converter;
    }
    
    protected function buildOrderingImagesFormDataConverter()
    {
        $formDataConverter = $this->buildOrderingElementFormDataConverter();
        $formDataConverter->setContext(ilAssOrderingFormValuesObjectsConverter::CONTEXT_MAINTAIN_ELEMENT_IMAGE);
        
        $formDataConverter->setImageRemovalCommand(self::ORDERING_ELEMENT_FORM_CMD_REMOVE_IMG);
        $formDataConverter->setImageUrlPath($this->getImagePathWeb());
        $formDataConverter->setImageFsPath($this->getImagePath());
        
        if ($this->getThumbSize() && $this->getThumbPrefix()) {
            $formDataConverter->setThumbnailPrefix($this->getThumbPrefix());
        }
        return $formDataConverter;
    }
    
    protected function buildOrderingTextsFormDataConverter()
    {
        $formDataConverter = $this->buildOrderingElementFormDataConverter();
        $formDataConverter->setContext(ilAssOrderingFormValuesObjectsConverter::CONTEXT_MAINTAIN_ELEMENT_TEXT);
        return $formDataConverter;
    }
    
    protected function buildNestedOrderingFormDataConverter()
    {
        $formDataConverter = $this->buildOrderingElementFormDataConverter();
        $formDataConverter->setContext(ilAssOrderingFormValuesObjectsConverter::CONTEXT_MAINTAIN_HIERARCHY);
        
        if ($this->getOrderingType() == OQ_NESTED_PICTURES) {
            $formDataConverter->setImageRemovalCommand(self::ORDERING_ELEMENT_FORM_CMD_REMOVE_IMG);
            $formDataConverter->setImageUrlPath($this->getImagePathWeb());
            
            if ($this->getThumbSize() && $this->getThumbPrefix()) {
                $formDataConverter->setThumbnailPrefix($this->getThumbPrefix());
            }
        }
        
        return $formDataConverter;
    }
}