class IntegrityViolationList

class IntegrityViolationList extends \ArrayIterator {
    
    /**
     * {@inheritdoc}
     */
    public function add(IntegrityViolation $violation) {
        $this[] = $violation;
    }
    
    /**
     * {@inheritdoc}
     */
    public function addAll(IntegrityViolationList $other_list) {
        foreach ($other_list as $violation) {
            $this[] = $violation;
        }
    }
    
    /**
     * Returns the violation at a given offset.
     *
     * @param int $offset
     *   The offset of the violation.
     *
     * @return \Drupal\rules\Engine\IntegrityViolationInterface
     *   The violation.
     *
     * @throws \Drupal\rules\Exception\OutOfBoundsException
     *   Thrown if the offset does not exist.
     */
    public function get($offset) {
        try {
            return $this->offsetGet($offset);
        } catch (\OutOfBoundsException $e) {
            throw new OutOfBoundsException();
        }
    }
    
    /**
     * Returns whether the given offset exists.
     *
     * @param int $offset
     *   The violation offset.
     *
     * @return bool
     *   Whether the offset exists.
     */
    public function has($offset) {
        return $this->offsetExists($offset);
    }
    
    /**
     * Creates a new violation with the message and adds it to this list.
     *
     * @param \Drupal\Core\StringTranslation\TranslatableMarkup $message
     *   The violation message.
     * @param string $uuid
     *   (optional) UUID of the expression where the violation occurred.
     */
    public function addViolationWithMessage(TranslatableMarkup $message, $uuid = NULL) {
        $violation = new IntegrityViolation();
        $violation->setMessage($message);
        $violation->setUuid($uuid);
        $this[] = $violation;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getFor($uuid) {
        $uuid_violations = [];
        foreach ($this as $violation) {
            if ($violation->getUuid() === $uuid) {
                $uuid_violations[] = $violation;
            }
        }
        return $uuid_violations;
    }

}