ilAssLacEmptyAnswerExpression.php

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<?php

include_once "Modules/TestQuestionPool/classes/questions/LogicalAnswerCompare/Expressions/ilAssLacAbstractExpression.php";
include_once "Modules/TestQuestionPool/classes/questions/LogicalAnswerCompare/Expressions/ilAssLacSolutionExpressionInterface.php";

class ilAssLacEmptyAnswerExpression extends ilAssLacAbstractExpression implements ilAssLacSolutionExpressionInterface
{

        public static $pattern = '/(\?)/';

        public static $identifier = "?";

        protected $matched;

        protected function getPattern()
        {
                return '/(\?)/';
        }

        public function getValue()
        {
                return "?";
        }

        public function getDescription()
        {
                return " nicht beantwortet";
        }

        public function checkResult($result, $comperator, $index = null)
        {
                if($index == null)
                {
                        switch($comperator)
                        {
                                case "=":
                                        return !$result->hasSolutions();
                                        break;
                                case "<>":
                                        return $result->hasSolutions();
                                        break;
                                default:
                                        return false;
                        }
                }
                else
                {
                        $solution = $result->getSolutionForKey($index);
                        switch($comperator)
                        {
                                case "=":
                                        return $solution == null;
                                        break;
                                case "<>":
                                        return $solution != null;
                                        break;
                                default:
                                        return false;
                        }
                }

        }

        protected function setMatches($matches)
        {
                $this->matched = true;
        }
}