class.ilDBStepReaderExistsObjective.php

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<?php

use ILIAS\Setup\Objective;
use ILIAS\Setup\Environment;

class ilDBStepReaderExistsObjective implements Objective
{
    public function getHash(): string
    {
        return hash("sha256", self::class);
    }

    public function getLabel(): string
    {
        return "The step reader for database update steps exists.";
    }

    public function isNotable(): bool
    {
        return true;
    }

    public function getPreconditions(Environment $environment): array
    {
        return [
            new ilDatabaseUpdatedObjective()
        ];
    }

    public function achieve(Environment $environment): Environment
    {
        return $environment
            ->withResource(
                ilDBStepReader::class,
                new ilDBStepReader()
            );
    }

    public function isApplicable(Environment $environment): bool
    {
        $execution_db = $environment->getResource(ilDBStepReader::class);
        return is_null($execution_db);
    }
}