class.assMatchingQuestion.php

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

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

class assMatchingQuestion extends assQuestion implements ilObjQuestionScoringAdjustable, ilObjAnswerScoringAdjustable
{
        var $matchingpairs;

        var $matching_type;
        
        protected $terms;
        protected $definitions;
        
        var $thumb_geometry = 100;

        var $element_height;

        public function __construct(
                $title = "",
                $comment = "",
                $author = "",
                $owner = -1,
                $question = "",
                $matching_type = MT_TERMS_DEFINITIONS
        )
        {
                parent::__construct($title, $comment, $author, $owner, $question);
                $this->matchingpairs = array();
                $this->matching_type = $matching_type;
                $this->terms = array();
                $this->definitions = array();
        }

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

        public function saveToDb($original_id = "")
        {
                global $ilDB;

                $this->saveQuestionDataToDb($original_id);
                $this->saveAdditionalQuestionDataToDb();
                $this->saveAnswerSpecificDataToDb( $ilDB );


                parent::saveToDb($original_id);
        }

        public function saveAnswerSpecificDataToDb()
        {
                global $ilDB;
                // delete old terms
                $ilDB->manipulateF( "DELETE FROM qpl_a_mterm WHERE question_fi = %s",
                                                        array( 'integer' ),
                                                        array( $this->getId() )
                );

                // delete old definitions
                $ilDB->manipulateF( "DELETE FROM qpl_a_mdef WHERE question_fi = %s",
                                                        array( 'integer' ),
                                                        array( $this->getId() )
                );

                $termids = array();
                // write terms
                foreach ($this->terms as $key => $term)
                {
                        $next_id = $ilDB->nextId( 'qpl_a_mterm' );
                        $ilDB->manipulateF( "INSERT INTO qpl_a_mterm (term_id, question_fi, picture, term) VALUES (%s, %s, %s, %s)",
                                                                array( 'integer', 'integer', 'text', 'text' ),
                                                                array( $next_id, $this->getId(), $term->picture, $term->text )
                        );
                        $termids[$term->identifier] = $next_id;
                }

                $definitionids = array();
                // write definitions
                foreach ($this->definitions as $key => $definition)
                {
                        $next_id = $ilDB->nextId( 'qpl_a_mdef' );
                        $ilDB->manipulateF( "INSERT INTO qpl_a_mdef (def_id, question_fi, picture, definition, morder) VALUES (%s, %s, %s, %s, %s)",
                                                                array( 'integer', 'integer', 'text', 'text', 'integer' ),
                                                                array( $next_id, $this->getId(
                                                                ), $definition->picture, $definition->text, $definition->identifier )
                        );
                        $definitionids[$definition->identifier] = $next_id;
                }

                $ilDB->manipulateF( "DELETE FROM qpl_a_matching WHERE question_fi = %s",
                                                        array( 'integer' ),
                                                        array( $this->getId() )
                );
                $matchingpairs = $this->getMatchingPairs();
                foreach ($matchingpairs as $key => $pair)
                {
                        $next_id = $ilDB->nextId( 'qpl_a_matching' );
                        $ilDB->manipulateF( "INSERT INTO qpl_a_matching (answer_id, question_fi, points, term_fi, definition_fi) VALUES (%s, %s, %s, %s, %s)",
                                                                array( 'integer', 'integer', 'float', 'integer', 'integer' ),
                                                                array(
                                                                        $next_id,
                                                                        $this->getId(),
                                                                        $pair->points,
                                                                        $termids[$pair->term->identifier],
                                                                        $definitionids[$pair->definition->identifier]
                                                                )
                        );
                }

                $this->rebuildThumbnails();
        }

        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, shuffle, matching_type, thumb_geometry, element_height) VALUES (%s, %s, %s, %s, %s)",
                                                        array( "integer", "text", "text", "integer", "integer" ),
                                                        array(
                                                                $this->getId(),
                                                                $this->shuffle,
                                                                $this->matching_type,
                                                                $this->getThumbGeometry(),
                                                                ($this->getElementHeight() >= 20) ? $this->getElementHeight() : NULL
                                                        )
                );
        }

        public 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"]);
                        $this->setNrOfTries($data['nr_of_tries']);
                        $this->setAuthor($data["author"]);
                        $this->setPoints($data["points"]);
                        $this->setOwner($data["owner"]);
                        include_once("./Services/RTE/classes/class.ilRTE.php");
                        $this->setQuestion(ilRTE::_replaceMediaObjectImageSrc($data["question_text"], 1));
                        $this->setThumbGeometry($data["thumb_geometry"]);
                        $this->setElementHeight($data["element_height"]);
                        $this->setShuffle($data["shuffle"]);
                        $this->setEstimatedWorkingTime(substr($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)
                        {
                        }
                }

                $termids = array();
                $result = $ilDB->queryF("SELECT * FROM qpl_a_mterm WHERE question_fi = %s ORDER BY term_id ASC",
                        array('integer'),
                        array($question_id)
                );
                include_once "./Modules/TestQuestionPool/classes/class.assAnswerMatchingTerm.php";
                $this->terms = array();
                if ($result->numRows() > 0)
                {
                        while ($data = $ilDB->fetchAssoc($result))
                        {
                                $term = new assAnswerMatchingTerm($data['term'], $data['picture'], $data['term_id']);
                                array_push($this->terms, $term);
                                $termids[$data['term_id']] = $term;
                        }
                }

                $definitionids = array();
                $result = $ilDB->queryF("SELECT * FROM qpl_a_mdef WHERE question_fi = %s ORDER BY def_id ASC",
                        array('integer'),
                        array($question_id)
                );
                include_once "./Modules/TestQuestionPool/classes/class.assAnswerMatchingDefinition.php";
                $this->definitions = array();
                if ($result->numRows() > 0)
                {
                        while ($data = $ilDB->fetchAssoc($result))
                        {
                                $definition = new assAnswerMatchingDefinition($data['definition'], $data['picture'], $data['morder']);
                                array_push($this->definitions, $definition);
                                $definitionids[$data['def_id']] = $definition;
                        }
                }

                $this->matchingpairs = array();
                $result = $ilDB->queryF("SELECT * FROM qpl_a_matching WHERE question_fi = %s ORDER BY answer_id",
                        array('integer'),
                        array($question_id)
                );
                include_once "./Modules/TestQuestionPool/classes/class.assAnswerMatchingPair.php";
                if ($result->numRows() > 0)
                {
                        while ($data = $ilDB->fetchAssoc($result))
                        {
                                array_push($this->matchingpairs, new assAnswerMatchingPair($termids[$data['term_fi']], $definitionids[$data['definition_fi']], $data['points']));
                        }
                }
                parent::loadFromDb($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();
                }

                // copy question page content
                $clone->copyPageOfQuestion($this_id);
                // copy XHTML media objects
                $clone->copyXHTMLMediaObjectsOfQuestion($this_id);
                // duplicate the image
                $clone->duplicateImages($this_id, $thisObjId);

                $clone->onDuplicate($thisObjId, $this_id, $clone->getObjId(), $clone->getId());
                
                return $clone->id;
        }

        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
                $clone->copyImages($original_id, $source_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
                $clone->copyImages($sourceQuestionId, $sourceParentId);

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

                return $clone->id;
        }

        public function duplicateImages($question_id, $objectId = null)
        {
                global $ilLog;
                $imagepath = $this->getImagePath();
                $imagepath_original = str_replace("/$this->id/images", "/$question_id/images", $imagepath);
                
                if( (int)$objectId > 0 )
                {
                        $imagepath_original = str_replace("/$this->obj_id/", "/$objectId/", $imagepath_original);
                }
                
                foreach ($this->terms as $term)
                {
                        if (strlen($term->picture))
                        {
                                $filename = $term->picture;
                                if (!file_exists($imagepath))
                                {
                                        ilUtil::makeDirParents($imagepath);
                                }
                                if (!@copy($imagepath_original . $filename, $imagepath . $filename)) 
                                {
                                        $ilLog->write("matching question image could not be duplicated: $imagepath_original$filename");
                                }
                                if (@file_exists($imagepath_original . $this->getThumbPrefix() . $filename)) 
                                {
                                        if (!@copy($imagepath_original . $this->getThumbPrefix() . $filename, $imagepath . $this->getThumbPrefix() . $filename)) 
                                        {
                                                $ilLog->write("matching question image thumbnail could not be duplicated: $imagepath_original" . $this->getThumbPrefix() . $filename);
                                        }
                                }
                        }
                }
                foreach ($this->definitions as $definition)
                {
                        if (strlen($definition->picture))
                        {
                                $filename = $definition->picture;
                                if (!file_exists($imagepath))
                                {
                                        ilUtil::makeDirParents($imagepath);
                                }
                                if (!@copy($imagepath_original . $filename, $imagepath . $filename)) 
                                {
                                        $ilLog->write("matching question image could not be duplicated: $imagepath_original$filename");
                                }
                                if (@file_exists($imagepath_original . $this->getThumbPrefix() . $filename))
                                {
                                        if (!@copy($imagepath_original . $this->getThumbPrefix() . $filename, $imagepath . $this->getThumbPrefix() . $filename)) 
                                        {
                                                $ilLog->write("matching question image thumbnail could not be duplicated: $imagepath_original" . $this->getThumbPrefix() . $filename);
                                        }
                                }
                        }
                }
        }

        public function copyImages($question_id, $source_questionpool)
        {
                global $ilLog;
                
                $imagepath = $this->getImagePath();
                $imagepath_original = str_replace("/$this->id/images", "/$question_id/images", $imagepath);
                $imagepath_original = str_replace("/$this->obj_id/", "/$source_questionpool/", $imagepath_original);
                foreach ($this->terms as $term)
                {
                        if (strlen($term->picture))
                        {
                                if (!file_exists($imagepath))
                                {
                                        ilUtil::makeDirParents($imagepath);
                                }
                                $filename = $term->picture;
                                if (!@copy($imagepath_original . $filename, $imagepath . $filename)) 
                                {
                                        $ilLog->write("matching question image could not be copied: $imagepath_original$filename");
                                }
                                if (!@copy($imagepath_original . $this->getThumbPrefix() . $filename, $imagepath . $this->getThumbPrefix() . $filename)) 
                                {
                                        $ilLog->write("matching question image thumbnail could not be copied: $imagepath_original" . $this->getThumbPrefix() . $filename);
                                }
                        }
                }
                foreach ($this->definitions as $definition)
                {
                        if (strlen($definition->picture))
                        {
                                $filename = $definition->picture;
                                if (!file_exists($imagepath))
                                {
                                        ilUtil::makeDirParents($imagepath);
                                }
                                if (!copy($imagepath_original . $filename, $imagepath . $filename)) 
                                {
                                        $ilLog->write("matching question image could not be copied: $imagepath_original$filename");
                                }
                                if (!copy($imagepath_original . $this->getThumbPrefix() . $filename, $imagepath . $this->getThumbPrefix() . $filename)) 
                                {
                                        $ilLog->write("matching question image thumbnail could not be copied: $imagepath_original" . $this->getThumbPrefix() . $filename);
                                }
                        }
                }
        }

        public function insertMatchingPair($position, $term = null, $definition = null, $points = 0.0)
        {
                include_once "./Modules/TestQuestionPool/classes/class.assAnswerMatchingPair.php";
                include_once "./Modules/TestQuestionPool/classes/class.assAnswerMatchingTerm.php";
                include_once "./Modules/TestQuestionPool/classes/class.assAnswerMatchingDefinition.php";
                if (is_null($term)) $term = new assAnswerMatchingTerm();
                if (is_null($definition)) $definition = new assAnswerMatchingDefinition();
                $pair = new assAnswerMatchingPair($term, $definition, $points);
                if ($position < count($this->matchingpairs))
                {
                        $part1 = array_slice($this->matchingpairs, 0, $position);
                        $part2 = array_slice($this->matchingpairs, $position);
                        $this->matchingpairs = array_merge($part1, array($pair), $part2);
                }
                else
                {
                        array_push($this->matchingpairs, $pair);
                }
        }

        public function addMatchingPair($term = null, $definition = null, $points = 0.0)
        {
                require_once './Modules/TestQuestionPool/classes/class.assAnswerMatchingPair.php';
                require_once './Modules/TestQuestionPool/classes/class.assAnswerMatchingTerm.php';
                require_once './Modules/TestQuestionPool/classes/class.assAnswerMatchingDefinition.php';
                if (is_null($term)) 
                {
                        $term = new assAnswerMatchingTerm();
                }
                if (is_null($definition)) 
                {
                        $definition = new assAnswerMatchingDefinition();
                }
                $pair = new assAnswerMatchingPair($term, $definition, $points);
                array_push($this->matchingpairs, $pair);
        }

        public function getTermWithIdentifier($a_identifier)
        {
                foreach ($this->terms as $term)
                {
                        if ($term->identifier == $a_identifier) return $term;
                }
                return null;
        }

        public function getDefinitionWithIdentifier($a_identifier)
        {
                foreach ($this->definitions as $definition)
                {
                        if ($definition->identifier == $a_identifier) return $definition;
                }
                return null;
        }

        public function getMatchingPair($index = 0)
        {
                if ($index < 0)
                {
                        return NULL;
                }
                if (count($this->matchingpairs) < 1)
                {
                        return NULL;
                }
                if ($index >= count($this->matchingpairs))
                {
                        return NULL;
                }
                return $this->matchingpairs[$index];
        }

        public function deleteMatchingPair($index = 0)
        {
                if ($index < 0)
                {
                        return;
                }
                if (count($this->matchingpairs) < 1)
                {
                        return;
                }
                if ($index >= count($this->matchingpairs))
                {
                        return;
                }
                unset($this->matchingpairs[$index]);
                $this->matchingpairs = array_values($this->matchingpairs);
        }

        public function flushMatchingPairs()
        {
                $this->matchingpairs = array();
        }

        public function getMatchingPairCount()
        {
                return count($this->matchingpairs);
        }

        public function getTerms()
        {
                return $this->terms;
        }
        
        public function getDefinitions()
        {
                return $this->definitions;
        }
        
        public function getTermCount()
        {
                return count($this->terms);
        }
        
        public function getDefinitionCount()
        {
                return count($this->definitions);
        }
        
        public function addTerm($term)
        {
                array_push($this->terms, $term);
        }
        
        public function addDefinition($definition)
        {
                array_push($this->definitions, $definition);
        }
        
        public function insertTerm($position, $term = null)
        {
                if (is_null($term))
                {
                        include_once "./Modules/TestQuestionPool/classes/class.assAnswerMatchingTerm.php";
                        $term = new assAnswerMatchingTerm();
                }
                if ($position < count($this->terms))
                {
                        $part1 = array_slice($this->terms, 0, $position);
                        $part2 = array_slice($this->terms, $position);
                        $this->terms = array_merge($part1, array($term), $part2);
                }
                else
                {
                        array_push($this->terms, $term);
                }
        }
        
        public function insertDefinition($position, $definition = null)
        {
                if (is_null($definition))
                {
                        include_once "./Modules/TestQuestionPool/classes/class.assAnswerMatchingDefinition.php";
                        $definition = new assAnswerMatchingDefinition();
                }
                if ($position < count($this->definitions))
                {
                        $part1 = array_slice($this->definitions, 0, $position);
                        $part2 = array_slice($this->definitions, $position);
                        $this->definitions = array_merge($part1, array($definition), $part2);
                }
                else
                {
                        array_push($this->definitions, $definition);
                }
        }
        
        public function flushTerms()
        {
                $this->terms = array();
        }

        public function flushDefinitions()
        {
                $this->definitions = array();
        }

        public function deleteTerm($position)
        {
                unset($this->terms[$position]);
                $this->terms = array_values($this->terms);
        }

        public function deleteDefinition($position)
        {
                unset($this->definitions[$position]);
                $this->definitions = array_values($this->definitions);
        }

        public function setTerm($term, $index)
        {
                $this->terms[$index] = $term;
        }

        public function calculateReachedPoints($active_id, $pass = NULL, $returndetails = FALSE)
        {
                if( $returndetails )
                {
                        throw new ilTestException('return details not implemented for '.__METHOD__);
                }
                
                global $ilDB;
                
                $found_value1 = array();
                $found_value2 = array();
                if (is_null($pass))
                {
                        $pass = $this->getSolutionMaxPass($active_id);
                }
                $result = $ilDB->queryF("SELECT * FROM tst_solutions WHERE active_fi = %s AND question_fi = %s AND pass = %s",
                        array('integer','integer','integer'),
                        array($active_id, $this->getId(), $pass)
                );
                while ($data = $ilDB->fetchAssoc($result))
                {
                        if (strcmp($data["value1"], "") != 0)
                        {
                                array_push($found_value1, $data["value1"]);
                                array_push($found_value2, $data["value2"]);
                        }
                }
                $points = 0;
                foreach ($found_value2 as $key => $value)
                {
                        foreach ($this->matchingpairs as $pair)
                        {
                                if (($pair->definition->identifier == $value) && ($pair->term->identifier == $found_value1[$key]))
                                {
                                        $points += $pair->points;
                                }
                        }
                }

                return $points;
        }

        function getMaximumPoints()
        {
                $points = 0;
                foreach ($this->matchingpairs as $key => $pair)
                {
                        if ($pair->points > 0)
                        {
                                $points += $pair->points;
                        }
                }
                return $points;
        }
        
        public function getEncryptedFilename($filename)
        {
                $extension = "";
                if (preg_match("/.*\\.(\\w+)$/", $filename, $matches))
                {
                        $extension = $matches[1];
                }
                return md5($filename) . "." . $extension;
        }

        public function removeTermImage($index)
        {
                $term = $this->terms[$index];
                if (is_object($term))
                {
                        $this->deleteImagefile($term->picture);
                        $term->picture = null;
                }
        }
        
        public function removeDefinitionImage($index)
        {
                $definition = $this->definitions[$index];
                if (is_object($definition))
                {
                        $this->deleteImagefile($definition->picture);
                        $definition->picture = null;
                }
        }
        

        public function deleteImagefile($filename)
        {
                $deletename = $filename;
                $result = @unlink($this->getImagePath().$deletename);
                $result = $result & @unlink($this->getImagePath().$this->getThumbPrefix() . $deletename);
                return $result;
        }

        function setImageFile($image_tempfilename, $image_filename, $previous_filename = '')
        {
                $result = TRUE;
                if (strlen($image_tempfilename))
                {
                        $image_filename = str_replace(" ", "_", $image_filename);
                        $imagepath = $this->getImagePath();
                        if (!file_exists($imagepath))
                        {
                                ilUtil::makeDirParents($imagepath);
                        }
                        $savename = $image_filename;
                        if (!ilUtil::moveUploadedFile($image_tempfilename, $savename, $imagepath.$savename))
                        {
                                $result = FALSE;
                        }
                        else
                        {
                                // create thumbnail file
                                $thumbpath = $imagepath . $this->getThumbPrefix() . $savename;
                                ilUtil::convertImage($imagepath.$savename, $thumbpath, "JPEG", $this->getThumbGeometry());
                        }
                        if ($result && (strcmp($image_filename, $previous_filename) != 0) && (strlen($previous_filename)))
                        {
                                $this->deleteImagefile($previous_filename);
                        }
                }
                return $result;
        }

        function checkSaveData()
        {
                $result = true;
                $matching_values = array();
                foreach ($_POST['matching'][$this->getId()] as $definition => $term)
                {
                        if ($term > 0)
                        {
                                array_push($matching_values, $term);
                        }
                }

                $check_matching = array_flip($matching_values);
                if (count($check_matching) != count($matching_values))
                {
                        $result = false;
                        ilUtil::sendFailure($this->lng->txt("duplicate_matching_values_selected"), true);
                }
                return $result;
        }

        public function saveWorkingData($active_id, $pass = NULL)
        {
                global $ilDB;
                global $ilUser;
                $saveWorkingDataResult = $this->checkSaveData();
                $entered_values = 0;
                if ($saveWorkingDataResult)
                {
                        if (is_null($pass))
                        {
                                include_once "./Modules/Test/classes/class.ilObjTest.php";
                                $pass = ilObjTest::_getPass($active_id);
                        }
                        
                        $this->getProcessLocker()->requestUserSolutionUpdateLock();

                        $affectedRows = $ilDB->manipulateF("DELETE FROM tst_solutions WHERE active_fi = %s AND question_fi = %s AND pass = %s",
                                array('integer','integer','integer'),
                                array($active_id, $this->getId(), $pass)
                        );

                        foreach ($_POST['matching'][$this->getId()] as $definition => $term)
                        {
                                $entered_values++;
                                $next_id = $ilDB->nextId('tst_solutions');
                                $affectedRows = $ilDB->insert("tst_solutions", array(
                                        "solution_id" => array("integer", $next_id),
                                        "active_fi" => array("integer", $active_id),
                                        "question_fi" => array("integer", $this->getId()),
                                        "value1" => array("clob", $term),
                                        "value2" => array("clob", $definition),
                                        "pass" => array("integer", $pass),
                                        "tstamp" => array("integer", time())
                                ));
                        }

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

                return $saveWorkingDataResult;
        }

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

        public function getRandomId()
        {
                mt_srand((double)microtime()*1000000);
                $random_number = mt_rand(1, 100000);
                $found = FALSE;
                while ($found)
                {
                        $found = FALSE;
                        foreach ($this->matchingpairs as $key => $pair)
                        {
                                if (($pair->term->identifier == $random_number) || ($pair->definition->identifier == $random_number))
                                {
                                        $found = TRUE;
                                        $random_number++;
                                }
                        }
                }
                return $random_number;
        }

        public function setShuffle($shuffle)
        {
                switch ($shuffle)
                {
                        case 0:
                        case 1:
                        case 2:
                        case 3:
                                $this->shuffle = $shuffle;
                                break;
                        default:
                                $this->shuffle = 1;
                                break;
                }
        }

        public function getQuestionType()
        {
                return "assMatchingQuestion";
        }
        
        public function getAdditionalTableName()
        {
                return "qpl_qst_matching";
        }

        public function getAnswerTableName()
        {
                return array("qpl_a_matching", "qpl_a_mterm");
        }

        public function getRTETextWithMediaObjects()
        {
                return parent::getRTETextWithMediaObjects();
        }
        
        public function &getMatchingPairs()
        {
                return $this->matchingpairs;
        }

        public function supportsJavascriptOutput()
        {
                return TRUE;
        }

        public function setExportDetailsXLS(&$worksheet, $startrow, $active_id, $pass, &$format_title, &$format_bold)
        {
                include_once ("./Services/Excel/classes/class.ilExcelUtils.php");
                $solutions = $this->getSolutionValues($active_id, $pass);
                $worksheet->writeString($startrow, 0, ilExcelUtils::_convert_text($this->lng->txt($this->getQuestionType())), $format_title);
                $worksheet->writeString($startrow, 1, ilExcelUtils::_convert_text($this->getTitle()), $format_title);
                $imagepath = $this->getImagePath();
                $i = 1;
                foreach ($solutions as $solution)
                {
                        $matches_written = FALSE;
                        foreach ($this->getMatchingPairs() as $idx => $pair)
                        {
                                if (!$matches_written) $worksheet->writeString($startrow + $i, 1, ilExcelUtils::_convert_text($this->lng->txt("matches")));
                                $matches_written = TRUE;
                                if ($pair->definition->identifier == $solution["value2"])
                                {
                                        if (strlen($pair->definition->text))
                                        {
                                                $worksheet->writeString($startrow + $i, 0, ilExcelUtils::_convert_text($pair->definition->text));
                                        }
                                        else
                                        {
                                                $worksheet->writeString($startrow + $i, 0, ilExcelUtils::_convert_text($pair->definition->picture));
                                        }
                                }
                                if ($pair->term->identifier == $solution["value1"])
                                {
                                        if (strlen($pair->term->text))
                                        {
                                                $worksheet->writeString($startrow + $i, 2, ilExcelUtils::_convert_text($pair->term->text));
                                        }
                                        else
                                        {
                                                $worksheet->writeString($startrow + $i, 2, ilExcelUtils::_convert_text($pair->term->picture));
                                        }
                                }
                        }
                        $i++;
                }
                return $startrow + $i + 1;
        }
        
        public function getThumbGeometry()
        {
                return $this->thumb_geometry;
        }
        
        public function getThumbSize()
        {
                return $this->getThumbGeometry();
        }
        
        public function setThumbGeometry($a_geometry)
        {
                $this->thumb_geometry = ($a_geometry < 1) ? 100 : $a_geometry;
        }

        public function getElementHeight()
        {
                return $this->element_height;
        }
        
        public function setElementHeight($a_height)
        {
                $this->element_height = ($a_height < 20) ? "" : $a_height;
        }

        public function rebuildThumbnails()
        {
                foreach ($this->terms as $term)
                {
                        if (strlen($term->picture)) $this->generateThumbForFile($this->getImagePath(), $term->picture);
                }
                foreach ($this->definitions as $definition)
                {
                        if (strlen($definition->picture)) $this->generateThumbForFile($this->getImagePath(), $definition->picture);
                }
        }
        
        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 getEstimatedElementHeight()
        {
                $hasImages = false;
                foreach ($this->terms as $term)
                {
                        if (strlen($term->picture))
                        {
                                $hasImages = true;
                        }
                }
                foreach ($this->definitions as $definition)
                {
                        if (strlen($definition->picture))
                        {
                                $hasImages = true;
                        }
                }
                if ($hasImages)
                { // 40 is approx. the height of the preview image
                        return max($this->getElementHeight(), $this->getThumbSize() + 40);
                }
                else
                {
                        return ($this->getElementHeight()) ? $this->getElementHeight() : 0;
                }
        }
        
        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'] = true;
                $result['feedback'] = array(
                        "onenotcorrect" => $this->feedbackOBJ->getGenericFeedbackTestPresentation($this->getId(), false),
                        "allcorrect" => $this->feedbackOBJ->getGenericFeedbackTestPresentation($this->getId(), true)
                );
                                
                $terms = array("" => array("id"=>"-1", 
                        "term"=>$this->lng->txt("please_select")));
                foreach ($this->getTerms() as $term)
                {
                        $terms[(int)$term->identifier] = array(
                                "term" => $term->text,
                                "id" =>(int)$term->identifier
                        );
                }
                // $terms = $this->pcArrayShuffle($terms);                              

                // alex 9.9.2010 as a fix for bug 6513 I added the question id
                // to the "def_id" in the array. The $pair->definition->identifier is not
                // unique, since it gets it value from the morder table field
                // this value is not changed, when a question is copied.
                // thus copying the same question on a page results in problems
                // when the second one (the copy) is answered.

                $pairs = array();
                foreach ($this->getDefinitions() as $def)
                {
                        array_push($pairs, array(
                                "definition" => (string) $def->text,
                                "def_id" => (int) $this->getId().$def->identifier,
                                "terms" => $terms
                        ));
                }
                $result['pairs'] = $pairs;
                
                // #10353
                $match = $points = array();
                foreach ($this->getMatchingPairs() as $pair)
                {                       
                        $pid = $pair->definition->identifier;
                        
                        // we only need pairs with max. points for def-id
                        if(!isset($match[$pid]) || $match[$pid]["points"] < $pair->points)
                        {                               
                                $match[$pid] = array(
                                        "term_id" => (int) $pair->term->identifier,
                                        "def_id" => (int) $this->getId().$pair->definition->identifier,
                                        "points" => (int) $pair->points
                                );                                                                      
                        }
                }               
                $result['match'] = array_values($match);
                        
                $mobs = ilObjMediaObject::_getMobsOfObject("qpl:html", $this->getId());
                $result['mobs'] = $mobs;

                return json_encode($result);
        }
}