class.ilTestVirtualSequence.php

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

require_once 'Modules/Test/interfaces/interface.ilTestQuestionSequence.php';

class ilTestVirtualSequence implements ilTestQuestionSequence
{
        protected $db;

        protected $testOBJ;

        protected $testSequenceFactory;

        protected $activeId;

        protected $questionsPassMap;
        
        public function __construct(ilDBInterface $db, ilObjTest $testOBJ, ilTestSequenceFactory $testSequenceFactory)
        {
                $this->db = $db;
                $this->testOBJ = $testOBJ;
                $this->testSequenceFactory = $testSequenceFactory;
                
                $this->activeId = null;

                $this->questionsPassMap = array();
        }

        public function getActiveId()
        {
                return $this->activeId;
        }

        public function setActiveId($activeId)
        {
                $this->activeId = $activeId;
        }

        public function getQuestionIds()
        {
                return array_keys($this->questionsPassMap);
        }

        public function getQuestionsPassMap()
        {
                return $this->questionsPassMap;
        }

        public function getUniquePasses()
        {
                return array_unique(array_values($this->questionsPassMap));
        }
        
        public function init()
        {
                $passes = $this->getExistingPassesDescendent($this->getActiveId());
                $this->fetchQuestionsFromPasses($this->getActiveId(), $passes);
        }

        private function getExistingPassesDescendent($activeId)
        {
                require_once 'Modules/Test/classes/class.ilTestPassesSelector.php';
                $passesSelector = new ilTestPassesSelector($this->db, $this->testOBJ);
                $passesSelector->setActiveId($activeId);
                
                $passes = $passesSelector->getExistingPasses();

                rsort($passes, SORT_NUMERIC);

                return $passes;
        }

        protected function getTestSequence($activeId, $pass)
        {
                $testSequence = $this->testSequenceFactory->getSequenceByActiveIdAndPass($activeId, $pass);

                $testSequence->loadFromDb();
                $testSequence->loadQuestions();

                $testSequence->setConsiderHiddenQuestionsEnabled(true);
                $testSequence->setConsiderOptionalQuestionsEnabled(true);
                return $testSequence;
        }

        protected function wasAnsweredInThisPass(ilTestSequence $testSequence, $questionId)
        {
                if( $testSequence->isHiddenQuestion($questionId) )
                {
                        return false;
                }

                if( !$testSequence->isQuestionOptional($questionId) )
                {
                        return true;
                }

                if( $testSequence->isAnsweringOptionalQuestionsConfirmed() )
                {
                        return true;
                }

                return false;
        }

        protected function fetchQuestionsFromPasses($activeId, $passes)
        {
                $this->questionsPassMap = array();

                foreach($passes as $pass)
                {
                        $testSequence = $this->getTestSequence($activeId, $pass);

                        foreach($testSequence->getOrderedSequenceQuestions() as $questionId)
                        {
                                if(isset($this->questionsPassMap[$questionId]))
                                {
                                        continue;
                                }

                                if($this->wasAnsweredInThisPass($testSequence, $questionId))
                                {
                                        $this->questionsPassMap[$questionId] = $pass;
                                }
                        }
                }
        }
}