class.ilTestDynamicQuestionSet.php

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

require_once 'Modules/TestQuestionPool/classes/class.ilAssQuestionList.php';

class ilTestDynamicQuestionSet
{
        private $db = null;
        
        private $lng = null;
        
        private $pluginAdmin = null;
        
        private $testOBJ = null;
        
        private $completeQuestionList = null;
        
        private $filteredQuestionList = null;
        
        private $actualQuestionSequence = array();
        
        public function __construct(ilDB $db, ilLanguage $lng, ilPluginAdmin $pluginAdmin, ilObjTest $testOBJ)
        {
                $this->db = $db;
                $this->lng = $lng;
                $this->pluginAdmin = $pluginAdmin;
                $this->testOBJ = $testOBJ;
        }
        
        
        public function load(ilObjTestDynamicQuestionSetConfig $dynamicQuestionSetConfig, ilTestDynamicQuestionSetFilterSelection $filterSelection)
        {
                $this->completeQuestionList = $this->initCompleteQuestionList(
                                        $dynamicQuestionSetConfig, $filterSelection->getAnswerStatusActiveId()
                );
                
                $this->filteredQuestionList = $this->initFilteredQuestionList(
                                        $dynamicQuestionSetConfig, $filterSelection
                );
                
                $this->actualQuestionSequence = $this->initActualQuestionSequence(
                                        $dynamicQuestionSetConfig, $this->filteredQuestionList
                );
        }
        

        private function initCompleteQuestionList(ilObjTestDynamicQuestionSetConfig $dynamicQuestionSetConfig, $answerStatusActiveId)
        {
                $questionList = new ilAssQuestionList(
                                $this->db, $this->lng, $this->pluginAdmin, $dynamicQuestionSetConfig->getSourceQuestionPoolId()
                );

                $questionList->setAnswerStatusActiveId($answerStatusActiveId);
                
                $questionList->load();
                
                return $questionList;
        }
        
        private function initFilteredQuestionList(ilObjTestDynamicQuestionSetConfig $dynamicQuestionSetConfig, ilTestDynamicQuestionSetFilterSelection $filterSelection)
        {
                $questionList = new ilAssQuestionList(
                                $this->db, $this->lng, $this->pluginAdmin, $dynamicQuestionSetConfig->getSourceQuestionPoolId()
                );

                $questionList->setAnswerStatusActiveId($filterSelection->getAnswerStatusActiveId());

                if( $dynamicQuestionSetConfig->isAnswerStatusFilterEnabled() )
                {
                        $questionList->setAnswerStatusFilter($filterSelection->getAnswerStatusSelection());
                }

                if( $dynamicQuestionSetConfig->isTaxonomyFilterEnabled() )
                {
                        require_once 'Services/Taxonomy/classes/class.ilObjTaxonomy.php';
                        
                        $questionList->setAvailableTaxonomyIds( ilObjTaxonomy::getUsageOfObject(
                                        $dynamicQuestionSetConfig->getSourceQuestionPoolId()
                        ));
                        
                        foreach($filterSelection->getTaxonomySelection() as $taxId => $taxNodes)
                        {
                                $questionList->addTaxonomyFilter($taxId, $taxNodes);
                        }
                }
                elseif( $dynamicQuestionSetConfig->getOrderingTaxonomyId() )
                {
                        $questionList->setAvailableTaxonomyIds( array(
                                $dynamicQuestionSetConfig->getOrderingTaxonomyId()
                        ));
                }
                
                $questionList->setForcedQuestionIds($filterSelection->getForcedQuestionIds());
                
                $questionList->load();
                
                return $questionList;
        }
        
        private function initActualQuestionSequence(ilObjTestDynamicQuestionSetConfig $dynamicQuestionSetConfig, ilAssQuestionList $questionList)
        {
                if( $dynamicQuestionSetConfig->getOrderingTaxonomyId() )
                {
                        return $this->getQuestionSequenceStructuredByTaxonomy(
                                        $questionList, $dynamicQuestionSetConfig->getOrderingTaxonomyId()
                        );
                }
                
                return $this->getQuestionSequenceStructuredByUpdateDate($questionList);
        }

        
        private function getQuestionSequenceStructuredByTaxonomy(ilAssQuestionList $questionList, $orderingTaxId)
        {
                $questionsByNode = array();
                $nodelessQuestions = array();
                
                foreach($questionList->getQuestionDataArray() as $qId => $qData)
                {
                        if( isset($qData['taxonomies'][$orderingTaxId]) && count($qData['taxonomies'][$orderingTaxId]) )
                        {
                                foreach($qData['taxonomies'][$orderingTaxId] as $nodeId => $itemData)
                                {
                                        $questionsByNode[ $itemData['node_lft'] ][ $itemData['order_nr'] ] = $qId;
                                        break;
                                }
                        }
                        else
                        {
                                $nodelessQuestions[$qData['tstamp'].'::'.$qId] = $qId;
                        }
                }
                
                foreach($questionsByNode as $nodeLft => $questions)
                {
                        ksort($questions, SORT_NUMERIC);
                        $questionsByNode[$nodeLft] = array_values($questions);
                }

                ksort($questionsByNode, SORT_NUMERIC);
                $sequence = array_values($questionsByNode);
                
                ksort($nodelessQuestions);
                $sequence[] = array_values($nodelessQuestions);
                
                return $sequence;
        }
        
        private function getQuestionSequenceStructuredByUpdateDate(ilAssQuestionList $questionList)
        {
                $sequence = array();
                
                foreach($questionList->getQuestionDataArray() as $qId => $qData)
                {
                        $sequence[ $qData['tstamp'].'::'.$qId ] = $qId;
                }
                
                ksort($sequence);
                $sequence = array_values($sequence);
                
                return array($sequence);
        }
        
        
        public function getActualQuestionSequence()
        {
                return $this->actualQuestionSequence;
        }
        
        public function questionExists($questionId)
        {
                $questionData = $this->completeQuestionList->getQuestionDataArray();
                return isset($questionData[$questionId]);
        }
        
        public function getQuestionData($questionId)
        {
                $questionData = $this->completeQuestionList->getQuestionDataArray();
                return $questionData[$questionId];
        }
        
        public function getAllQuestionsData()
        {
                return $this->completeQuestionList->getQuestionDataArray();
        }
        

        public function getCompleteQuestionList()
        {
                return $this->completeQuestionList;
        }
        
        public function getFilteredQuestionList()
        {
                return $this->filteredQuestionList;
        }
}