class.ilTestSequenceRandomQuestionSet.php

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

require_once 'Modules/Test/classes/class.ilTestSequence.php';
require_once 'Modules/Test/interfaces/interface.ilTestRandomQuestionSequence.php';


class ilTestSequenceRandomQuestionSet extends ilTestSequence implements ilTestRandomQuestionSequence
{
        private $responsibleSourcePoolDefinitionByQuestion = array();

        public function loadQuestions()
        {
                global $ilDB;

                $this->questions = array();

                $result = $ilDB->queryF("SELECT tst_test_rnd_qst.* FROM tst_test_rnd_qst, qpl_questions WHERE tst_test_rnd_qst.active_fi = %s AND qpl_questions.question_id = tst_test_rnd_qst.question_fi AND tst_test_rnd_qst.pass = %s ORDER BY sequence",
                        array('integer','integer'),
                        array($this->active_id, $this->pass)
                );
                // The following is a fix for random tests prior to ILIAS 3.8. If someone started a random test in ILIAS < 3.8, there
                // is only one test pass (pass = 0) in tst_test_rnd_qst while with ILIAS 3.8 there are questions for every test pass.
                // To prevent problems with tests started in an older version and continued in ILIAS 3.8, the first pass should be taken if
                // no questions are present for a newer pass.
                if ($result->numRows() == 0)
                {
                        $result = $ilDB->queryF("SELECT tst_test_rnd_qst.* FROM tst_test_rnd_qst, qpl_questions WHERE tst_test_rnd_qst.active_fi = %s AND qpl_questions.question_id = tst_test_rnd_qst.question_fi AND tst_test_rnd_qst.pass = 0 ORDER BY sequence",
                                array('integer'),
                                array($this->active_id)
                        );
                }

                $index = 1;

                while ($data = $ilDB->fetchAssoc($result))
                {
                        $this->questions[$index++] = $data["question_fi"];

                        $this->responsibleSourcePoolDefinitionByQuestion[$data['question_fi']] = $data['src_pool_def_fi'];
                }
        }

        function hasRandomQuestionsForPass($active_id, $pass)
        {
                global $ilDB;
                $result = $ilDB->queryF("SELECT test_random_question_id FROM tst_test_rnd_qst WHERE active_fi = %s AND pass = %s",
                        array('integer','integer'),
                        array($active_id, $pass)
                );
                return ($result->numRows() > 0) ? true : false;
        }

        public function getResponsibleSourcePoolDefinitionId($questionId)
        {
                if( isset($this->responsibleSourcePoolDefinitionByQuestion[$questionId]) )
                {
                        return $this->responsibleSourcePoolDefinitionByQuestion[$questionId];
                }

                return null;
        }
}