GetRevisionTrait.php

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<?php
 
namespace ILIAS\ResourceStorage\Consumer;
 
use ILIAS\ResourceStorage\Revision\Revision;
use OutOfBoundsException;
 
trait GetRevisionTrait
{
    protected function getRevision(): Revision
    {
        if ($this->revision_number !== null) {
            if ($this->resource->hasSpecificRevision($this->revision_number)) {
                $revision = $this->resource->getSpecificRevision($this->revision_number);
            } else {
                throw new OutOfBoundsException(
                    "there is no version $this->revision_number of resource {$this->resource->getIdentification()->serialize()}"
                );
            }
        } else {
            $revision = $this->resource->getCurrentRevision();
        }
        return $revision;
    }
}