RevisionDBRepository.php

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<?php declare(strict_types=1);

namespace ILIAS\ResourceStorage\Revision\Repository;

use ILIAS\Filesystem\Stream\FileStream;
use ILIAS\FileUpload\DTO\UploadResult;
use ILIAS\ResourceStorage\Identification\ResourceIdentification;
use ILIAS\ResourceStorage\Revision\FileRevision;
use ILIAS\ResourceStorage\Revision\FileStreamRevision;
use ILIAS\ResourceStorage\Revision\Revision;
use ILIAS\ResourceStorage\Revision\RevisionCollection;
use ILIAS\ResourceStorage\Revision\UploadedFileRevision;
use ILIAS\ResourceStorage\Resource\StorableResource;
use ILIAS\ResourceStorage\Revision\CloneRevision;
use ILIAS\ResourceStorage\Resource\InfoResolver\InfoResolver;

class RevisionDBRepository implements RevisionRepository
{
    const TABLE_NAME = 'il_resource_revision';
    const IDENTIFICATION = 'rid';
    protected $db;
    protected $cache = [];

    public function __construct(\ilDBInterface $db)
    {
        $this->db = $db;
    }

    public function getNamesForLocking() : array
    {
        return [self::TABLE_NAME];
    }

    public function blankFromUpload(
        InfoResolver $info_resolver,
        StorableResource $resource,
        UploadResult $result
    ) : UploadedFileRevision {
        $new_version_number = $info_resolver->getNextVersionNumber();
        $revision = new UploadedFileRevision($resource->getIdentification(), $result);
        $revision->setVersionNumber($new_version_number);

        return $revision;
    }

    public function blankFromStream(
        InfoResolver $info_resolver,
        StorableResource $resource,
        FileStream $stream,
        bool $keep_original = false
    ) : FileStreamRevision {
        $new_version_number = $info_resolver->getNextVersionNumber();
        $revision = new FileStreamRevision($resource->getIdentification(), $stream, $keep_original);
        $revision->setVersionNumber($new_version_number);

        return $revision;
    }

    public function blankFromClone(
        InfoResolver $info_resolver,
        StorableResource $resource,
        FileRevision $revision_to_clone
    ) : CloneRevision {
        $new_version_number = $info_resolver->getNextVersionNumber();
        $revision = new CloneRevision($resource->getIdentification(), $revision_to_clone);
        $revision->setVersionNumber($new_version_number);

        return $revision;
    }

    public function store(Revision $revision) : void
    {
        $rid = $revision->getIdentification()->serialize();
        $r = $this->db->queryF(
            "SELECT " . self::IDENTIFICATION . " FROM " . self::TABLE_NAME . " WHERE " . self::IDENTIFICATION . " = %s AND version_number = %s",
            ['text', 'integer'],
            [$rid, $revision->getVersionNumber()]
        );

        if ($r->numRows() > 0) {
            // UPDATE
            $this->db->update(
                self::TABLE_NAME,
                [
                    'available' => ['integer', true],
                    'owner_id' => ['integer', $revision->getOwnerId()],
                    'title' => ['text', $revision->getTitle()]
                ],
                [
                    self::IDENTIFICATION => ['text', $rid],
                    'version_number' => ['integer', $revision->getVersionNumber()],
                ]
            );
        } else {
            // CREATE
            $this->db->insert(
                self::TABLE_NAME,
                [
                    self::IDENTIFICATION => ['text', $rid],
                    'version_number' => ['integer', $revision->getVersionNumber()],
                    'available' => ['integer', true],
                    'owner_id' => ['integer', $revision->getOwnerId()],
                    'title' => ['text', $revision->getTitle()]
                ]
            );
        }
        $this->cache[$rid][$revision->getVersionNumber()] = $revision;
    }

    public function get(StorableResource $resource) : RevisionCollection
    {
        $collection = new RevisionCollection($resource->getIdentification());

        $rid = $resource->getIdentification()->serialize();
        if (isset($this->cache[$rid]) && is_array($this->cache[$rid])) {
            foreach ($this->cache[$rid] as $rev) {
                $collection->add($rev);
            }
            return $collection;
        }
        $r = $this->db->queryF(
            "SELECT * FROM " . self::TABLE_NAME . " WHERE " . self::IDENTIFICATION . " = %s",
            ['text'],
            [$rid]
        );
        while ($d = $this->db->fetchObject($r)) {
            $revision = new FileRevision(new ResourceIdentification($d->rid));
            $revision->setVersionNumber((int) $d->version_number);
            $revision->setOwnerId((int) $d->owner_id);
            $revision->setTitle((string) $d->title);
            $collection->add($revision);
            $this->cache[$d->rid][(int) $d->version_number] = $revision;
        }

        return $collection;
    }

    public function delete(Revision $revision) : void
    {
        $rid = $revision->getIdentification()->serialize();
        $this->db->manipulateF(
            "DELETE FROM " . self::TABLE_NAME . " WHERE " . self::IDENTIFICATION . " = %s AND version_number = %s",
            ['text', 'integer'],
            [$rid, $revision->getVersionNumber()]
        );
        unset($this->cache[$rid][$revision->getVersionNumber()]);
    }

    public function preload(array $identification_strings) : void
    {
        $r = $this->db->query(
            "SELECT * FROM " . self::TABLE_NAME . " WHERE " . $this->db->in(
                self::IDENTIFICATION,
                $identification_strings,
                false,
                'text'
            )
        );
        while ($d = $this->db->fetchAssoc($r)) {
            $this->populateFromArray($d);
        }
    }

    public function populateFromArray(array $data) : void
    {
        $revision = new FileRevision(new ResourceIdentification($data['rid']));
        $revision->setVersionNumber((int) $data['version_number']);
        $revision->setOwnerId((int) $data['owner_id']);
        $revision->setTitle((string) $data['revision_title']);
        $this->cache[$data['rid']][(int) $data['version_number']] = $revision;
    }
}