ilAssLacNumberOfResultExpression.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 ilAssLacNumberOfResultExpression extends ilAssLacAbstractExpression implements ilAssLacSolutionExpressionInterface
{
        public static $pattern = "/\\+[0-9]+\\+/";

        public static $identifier = "+n+";

        protected $numeric_value;

        protected function setMatches($matches)
        {
                $this->numeric_value = $matches[0][0];
        }

        public function getNumericValue()
        {
                return $this->numeric_value;
        }

        public function getValue()
        {
                return '+' . $this->numeric_value . "+";
        }

        public function getDescription()
        {
                return "Anwort " . $this->numeric_value . " beantwortet ";
        }

        public function checkResult($result, $comperator, $index = null)
        {
                $isTrue = false;
                if($index == null)
                {
                        $values = $result->getUserSolutionsByIdentifier("key");

                        foreach($values as $value)
                        {
                                $isTrue = $isTrue || $this->compare($comperator, $value);
                        }
                }
                else
                {
                        $solution = $result->getSolutionForKey($index);
                        $isTrue = $this->compare($comperator, $solution["value"]);
                }

                return $isTrue;
        }

        private function compare($comperator, $value)
        {
                switch($comperator)
                {
                        case "=":
                                return $value == $this->getNumericValue();
                                break;
                        case "<>":
                                return $value != $this->getNumericValue();
                                break;
                        default:
                                return false;
                }
        }
}