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;
        
        var $ordering_type;

        var $thumb_geometry = 100;

        var $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 $ilDB;

                $this->saveQuestionDataToDb($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 ($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);
        }
        
        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();
        }

        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;
        }

        function duplicateImages($src_question_id, $src_object_id, $dest_question_id, $dest_object_id)
        {
                global $ilLog;
                if ($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!!!!");
                                        }
                                }
                        }
                }
        }
        
        function copyImages($question_id, $source_questionpool)
        {
                global $ilLog;
                if ($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);
                                        }
                                }
                        }
                }
        }

        function setOrderingType($ordering_type = OQ_TERMS)
        {
                $this->ordering_type = $ordering_type;
        }
        
        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)
        {
                if( $forceCorrectSolution || !$activeId || $passIndex === null )
                {
                        return $this->getOrderingElementList();
                }
                
                $solutionValues = $this->getSolutionValues($activeId, $passIndex);
                
                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);
        }

        function deleteAnswer($randomIdentifier)
        {
                $this->getOrderingElementList()->removeElement(
                        $this->getOrderingElementList()->getElementByRandomIdentifier($randomIdentifier)
                );
                $this->getOrderingElementList()->saveToDb();
        }

        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();
        }

        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();
                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 $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();
                }
        }

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

        function getQuestionType()
        {
                return "assOrderingQuestion";
        }

        function getAdditionalTableName()
        {
                return "qpl_qst_ordering";
        }

        function getAnswerTableName()
        {
                return "qpl_a_ordering";
        }

        function getRTETextWithMediaObjects()
        {
                $text = parent::getRTETextWithMediaObjects();
                
                foreach ( $this->getOrderingElementList() as $orderingElement)
                {
                        $text .= $orderingElement->getContent();
                }
                
                return $text;
        }
        
        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 = $this->getOrderingElementList()->getElementByPosition($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 $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 $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 $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 $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++;
                                                        }
                                                }
                                        }
                                }
                        }
                }
                else if( $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;
        }
}