class.ilTestRandomQuestionSetBuilder.php

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

abstract class ilTestRandomQuestionSetBuilder
{
        protected $db = null;

        protected $testOBJ = null;

        protected $questionSetConfig = null;

        protected $sourcePoolDefinitionList = null;

        protected $stagingPoolQuestionList = null;

        protected function __construct(
                ilDB $db,
                ilObjTest $testOBJ,
                ilTestRandomQuestionSetConfig $questionSetConfig,
                ilTestRandomQuestionSetSourcePoolDefinitionList $sourcePoolDefinitionList,
                ilTestRandomQuestionSetStagingPoolQuestionList $stagingPoolQuestionList
        )
        {
                $this->db = $db;
                $this->testOBJ = $testOBJ;
                $this->questionSetConfig = $questionSetConfig;
                $this->sourcePoolDefinitionList = $sourcePoolDefinitionList;
                $this->stagingPoolQuestionList = $stagingPoolQuestionList;
        }

        abstract public function checkBuildable();

        abstract public function performBuild(ilTestSession $testSession);


        protected function getQuestionStageForSourcePoolDefinitionList(ilTestRandomQuestionSetSourcePoolDefinitionList $sourcePoolDefinitionList)
        {
                $questionStage = array();

                foreach($sourcePoolDefinitionList as $definition)
                {
                        $questions = $this->getQuestionStageForSourcePoolDefinition($definition);
                        $questionStage = array_merge($questionStage, $questions);
                }

                return array_unique($questionStage);
        }

        protected function getQuestionStageForSourcePoolDefinition(ilTestRandomQuestionSetSourcePoolDefinition $definition)
        {
                $this->stagingPoolQuestionList->resetQuestionList();

                $this->stagingPoolQuestionList->setTestObjId( $this->testOBJ->getId() );
                $this->stagingPoolQuestionList->setTestId( $this->testOBJ->getTestId() );
                $this->stagingPoolQuestionList->setPoolId( $definition->getPoolId() );

                if( $this->hasTaxonomyFilter($definition) )
                {
                        $this->stagingPoolQuestionList->addTaxonomyFilter(
                                $definition->getMappedFilterTaxId(), array($definition->getMappedFilterTaxNodeId())
                        );
                }

                $this->stagingPoolQuestionList->loadQuestions();

                return $this->stagingPoolQuestionList->getQuestions();
        }

        private function hasTaxonomyFilter(ilTestRandomQuestionSetSourcePoolDefinition $definition)
        {
                if( !(int)$definition->getMappedFilterTaxId() )
                {
                        return false;
                }

                if( !(int)$definition->getMappedFilterTaxNodeId() )
                {
                        return false;
                }

                return true;
        }

        protected function storeQuestionSet(ilTestSession $testSession, $questionSet)
        {
                foreach($questionSet as $sequencePosition => $questionId)
                {
                        $this->storeQuestion($testSession, $questionId, $sequencePosition);
                }
        }

        private function storeQuestion(ilTestSession $testSession, $questionId, $sequencePosition)
        {
                $nextId = $this->db->nextId('tst_test_rnd_qst');

                $this->db->insert('tst_test_rnd_qst', array(
                        'test_random_question_id' => array('integer', $nextId),
                        'active_fi' => array('integer', $testSession->getActiveId()),
                        'question_fi' => array('integer', $questionId),
                        'sequence' => array('integer', $sequencePosition),
                        'pass' => array('integer', $testSession->getPass()),
                        'tstamp' => array('integer', time())
                ));
        }

        protected function fetchQuestionsFromStageRandomly($questionStage, $requiredQuestionAmount)
        {
                $randomKeys = $this->getRandomArrayKeys($questionStage, $requiredQuestionAmount);

                $questionSet = array();

                foreach($randomKeys as $randomKey)
                {
                        $questionSet[] = $questionStage[$randomKey];
                }

                return $questionSet;
        }

        private function getRandomArrayKeys($array, $numKeys)
        {
                if( $numKeys < 1 )
                {
                        return array();
                }

                if( $numKeys > 1 )
                {
                        return array_rand($array, $numKeys);
                }

                return array( array_rand($array, $numKeys) );
        }

        protected function handleQuestionOrdering($questionSet)
        {
                if( $this->testOBJ->getShuffleQuestions() )
                {
                        shuffle($questionSet);
                }

                return $questionSet;
        }

        // =================================================================================================================

        final static public function getInstance(
                ilDB $db, ilObjTest $testOBJ, ilTestRandomQuestionSetConfig $questionSetConfig,
                ilTestRandomQuestionSetSourcePoolDefinitionList $sourcePoolDefinitionList,
                ilTestRandomQuestionSetStagingPoolQuestionList $stagingPoolQuestionList
        )
        {
                if( $questionSetConfig->isQuestionAmountConfigurationModePerPool() )
                {
                        require_once 'Modules/Test/classes/class.ilTestRandomQuestionSetBuilderWithAmountPerPool.php';

                        return new ilTestRandomQuestionSetBuilderWithAmountPerPool(
                                $db, $testOBJ, $questionSetConfig, $sourcePoolDefinitionList, $stagingPoolQuestionList
                        );
                }

                require_once 'Modules/Test/classes/class.ilTestRandomQuestionSetBuilderWithAmountPerTest.php';

                return new ilTestRandomQuestionSetBuilderWithAmountPerTest(
                        $db, $testOBJ, $questionSetConfig, $sourcePoolDefinitionList, $stagingPoolQuestionList
                );
        }
}