RevisionCollection.php

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<?php

declare(strict_types=1);

namespace ILIAS\ResourceStorage\Revision;

use ILIAS\ResourceStorage\Identification\ResourceIdentification;

class RevisionCollection
{
    private ResourceIdentification $identification;
    private array $revisions = [];

    public function __construct(ResourceIdentification $identification, array $revisions = [])
    {
        $this->identification = $identification;
        $this->revisions = $revisions;
    }

    public function add(Revision $revision): void
    {
        if ($this->identification->serialize() !== $revision->getIdentification()->serialize()) {
            throw new NonMatchingIdentificationException(
                "Can't add Revision since it's not the same ResourceIdentification"
            );
        }
        foreach ($this->revisions as $r) {
            if ($r->getVersionNumber() === $revision->getVersionNumber()) {
                throw new RevisionExistsException(
                    sprintf(
                        "Can't add already existing version number: %s",
                        $revision->getVersionNumber()
                    )
                );
            }
        }
        $this->revisions[$revision->getVersionNumber()] = $revision;
        asort($this->revisions);
    }

    public function remove(Revision $revision): void
    {
        foreach ($this->revisions as $k => $revision_e) {
            if ($revision->getVersionNumber() === $revision_e->getVersionNumber()) {
                unset($this->revisions[$k]);

                return;
            }
        }
    }

    public function replaceSingleRevision(Revision $revision): void
    {
        foreach ($this->revisions as $k => $revision_e) {
            if ($revision_e->getVersionNumber() === $revision->getVersionNumber()) {
                $this->revisions[$k] = $revision;
            }
        }
    }

    public function replaceAllRevisions(Revision $revision): void
    {
        $this->revisions = [];
        $this->add($revision);
    }

    public function getCurrent(): Revision
    {
        $v = array_values($this->revisions);
        sort($v);
        $current = end($v);
        if (!$current instanceof Revision) {
            $current = new NullRevision($this->identification);
        }

        return $current;
    }

    public function getAll(): array
    {
        return $this->revisions;
    }

    public function getMax(): int
    {
        if ($this->revisions === []) {
            return 0;
        }
        return max(array_keys($this->revisions));
    }
}