class.ilTestRandomQuestionSetBuilderWithAmountPerPool.php

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

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

class ilTestRandomQuestionSetBuilderWithAmountPerPool extends ilTestRandomQuestionSetBuilder
{
        public function checkBuildable()
        {
                $questionStage = $this->getQuestionStageForSourcePoolDefinitionList($this->sourcePoolDefinitionList);

                if( $questionStage->isSmallerThan($this->sourcePoolDefinitionList->getQuestionAmount()) )
                {
                        return false;
                }

                return true;
        }

        public function performBuild(ilTestSession $testSession)
        {
                $questionSet = new ilTestRandomQuestionSetQuestionCollection();

                foreach($this->sourcePoolDefinitionList as $definition)
                {
                        $requiredQuestionAmount = $definition->getQuestionAmount();

                        $potentialQuestionStage = $this->getQuestionStageForSourcePoolDefinition($definition);

                        $actualQuestionStage = $potentialQuestionStage->getRelativeComplementCollection($questionSet);

                        if( $actualQuestionStage->isGreaterThan($requiredQuestionAmount) )
                        {
                                $questions = $this->fetchQuestionsFromStageRandomly($actualQuestionStage, $requiredQuestionAmount);
                        }
                        else
                        {
                                $questions = $actualQuestionStage;
                        }

                        $questionSet->mergeQuestionCollection($questions);
                }

                $requiredQuestionAmount = $this->sourcePoolDefinitionList->getQuestionAmount();

                if( $questionSet->isSmallerThan($requiredQuestionAmount) )
                {
                        $missingQuestionCount = $questionSet->getMissingCount($requiredQuestionAmount);
                        $potentialQuestionStage = $this->getQuestionStageForSourcePoolDefinitionList($this->sourcePoolDefinitionList);
                        $actualQuestionStage = $potentialQuestionStage->getRelativeComplementCollection($questionSet);
                        $questions = $this->fetchQuestionsFromStageRandomly($actualQuestionStage, $missingQuestionCount);

                        $questionSet->mergeQuestionCollection($questions);
                }

                $this->handleQuestionOrdering($questionSet);

                $this->storeQuestionSet($testSession, $questionSet);
        }
}