PersistenceTrackingDataImplementation.php

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<?php

declare(strict_types=1);

namespace ILIAS\AdvancedMetaData\Data;

abstract class PersistenceTrackingDataImplementation implements PersistenceTrackingData
{
    private bool $contains_changes = false;

    abstract public function isPersisted(): bool;

    abstract protected function getSubData(): \Generator;

    final public function containsChanges(): bool
    {
        if (!$this->isPersisted() || $this->contains_changes) {
            return true;
        }
        foreach ($this->getSubData() as $sub_datum) {
            if ($sub_datum->containsChanges()) {
                return true;
            }
        }
        return false;
    }

    final protected function markAsChanged(): void
    {
        $this->contains_changes = true;
    }
}