class.ilAssSpecificFeedbackIdentifierList.php

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<?php

class ilAssSpecificFeedbackIdentifierList implements Iterator
{
    protected array $map = [];

    protected function add(ilAssSpecificFeedbackIdentifier $identifier): void
    {
        $this->map[] = $identifier;
    }

    public function load(int $questionId): void
    {
        global $DIC; /* @var ILIAS\DI\Container $DIC */

        $res = $DIC->database()->queryF(
            "SELECT feedback_id, question, answer FROM {$this->getSpecificFeedbackTableName()} WHERE question_fi = %s",
            ['integer'],
            [$questionId]
        );

        while ($row = $DIC->database()->fetchAssoc($res)) {
            $identifier = new ilAssSpecificFeedbackIdentifier();

            $identifier->setQuestionId($questionId);

            $identifier->setQuestionIndex($row['question']);
            $identifier->setAnswerIndex($row['answer']);

            $identifier->setFeedbackId($row['feedback_id']);

            $this->add($identifier);
        }
    }

    public function current(): ?ilAssSpecificFeedbackIdentifier
    {
        return current($this->map);
    }

    public function next(): void
    {
        next($this->map);
    }

    public function key(): ?int
    {
        return key($this->map);
    }

    public function valid(): bool
    {
        return key($this->map) !== null;
    }

    public function rewind(): void
    {
        reset($this->map);
    }

    protected function getSpecificFeedbackTableName(): string
    {
        return ilAssClozeTestFeedback::TABLE_NAME_SPECIFIC_FEEDBACK;
    }
}