class.ilAssQuestionProcessLockFileStorage.php

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<?php
class ilAssQuestionProcessLockFileStorage extends ilFileSystemAbstractionStorage
{
    private $subPath;

    public function __construct(int $questionId, $userId)
    {
        parent::__construct(ilFileSystemAbstractionStorage::STORAGE_DATA, true, $questionId);

        $this->initSubPath($userId);
    }

    protected function getPathPrefix(): string
    {
        return 'ilAssQuestionProcessLocks';
    }

    protected function getPathPostfix(): string
    {
        return 'question';
    }

    public function getPath(): string
    {
        return parent::getPath() . '/' . $this->subPath;
    }

    public function create(): void
    {
        set_error_handler(function ($severity, $message, $file, $line): void {
            throw new ErrorException($message, $severity, 0, $file, $line);
        });

        try {
            parent::create($this->getPath());
            restore_error_handler();
        } catch (Exception $e) {
            restore_error_handler();
        }

        if (!$this->getFileSystemService()->has($this->path)) {
            throw new ErrorException(sprintf('Could not find directory: %s', $this->getPath()));
        }
    }

    private function initSubPath($userId): void
    {
        $userId = (string) $userId;

        $path = array();

        for ($i = 0, $max = strlen($userId); $i < $max; $i++) {
            $path[] = substr($userId, $i, 1);
        }

        $this->subPath = implode('/', $path);
    }
}