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<?php
declare(strict_types=1);
/**
* @copyright 2023 Maxence Lange <maxence@artificial-owl.com>
*
* @author Maxence Lange <maxence@artificial-owl.com>
*
* @license GNU AGPL version 3 or any later version
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU Affero General Public License as
* published by the Free Software Foundation, either version 3 of the
* License, or (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU Affero General Public License for more details.
*
* You should have received a copy of the GNU Affero General Public License
* along with this program. If not, see <http://www.gnu.org/licenses/>.
*
*/
namespace OC\FilesMetadata\Model;
use OC\FilesMetadata\Service\IndexRequestService;
use OC\FilesMetadata\Service\MetadataRequestService;
use OCP\DB\QueryBuilder\IQueryBuilder;
use OCP\FilesMetadata\Exceptions\FilesMetadataNotFoundException;
use OCP\FilesMetadata\Exceptions\FilesMetadataTypeException;
use OCP\FilesMetadata\Model\IFilesMetadata;
use OCP\FilesMetadata\Model\IMetadataQuery;
use OCP\FilesMetadata\Model\IMetadataValueWrapper;
/**
* @inheritDoc
* @since 28.0.0
*/
class MetadataQuery implements IMetadataQuery {
private array $knownJoinedIndex = [];
public function __construct(
private IQueryBuilder $queryBuilder,
private IFilesMetadata $knownMetadata,
private string $fileTableAlias = 'fc',
private string $fileIdField = 'fileid',
private string $alias = 'meta',
private string $aliasIndexPrefix = 'meta_index'
) {
}
/**
* @inheritDoc
* @see self::extractMetadata()
* @since 28.0.0
*/
public function retrieveMetadata(): void {
$this->queryBuilder->selectAlias($this->alias . '.json', 'meta_json');
$this->queryBuilder->leftJoin(
$this->fileTableAlias, MetadataRequestService::TABLE_METADATA, $this->alias,
$this->queryBuilder->expr()->eq($this->fileTableAlias . '.' . $this->fileIdField, $this->alias . '.file_id')
);
}
/**
* @param array $row result row
*
* @inheritDoc
* @return IFilesMetadata metadata
* @see self::retrieveMetadata()
* @since 28.0.0
*/
public function extractMetadata(array $row): IFilesMetadata {
$fileId = (array_key_exists($this->fileIdField, $row)) ? $row[$this->fileIdField] : 0;
$metadata = new FilesMetadata((int)$fileId);
try {
$metadata->importFromDatabase($row, $this->alias . '_');
} catch (FilesMetadataNotFoundException) {
// can be ignored as files' metadata are optional and might not exist in database
}
return $metadata;
}
/**
* @param string $metadataKey metadata key
* @param bool $enforce limit the request only to existing metadata
*
* @inheritDoc
* @since 28.0.0
*/
public function joinIndex(string $metadataKey, bool $enforce = false): string {
if (array_key_exists($metadataKey, $this->knownJoinedIndex)) {
return $this->knownJoinedIndex[$metadataKey];
}
$aliasIndex = $this->aliasIndexPrefix . '_' . count($this->knownJoinedIndex);
$this->knownJoinedIndex[$metadataKey] = $aliasIndex;
$expr = $this->queryBuilder->expr();
$andX = $expr->andX($expr->eq($aliasIndex . '.file_id', $this->fileTableAlias . '.' . $this->fileIdField));
$andX->add($expr->eq($this->getMetadataKeyField($metadataKey), $this->queryBuilder->createNamedParameter($metadataKey)));
if ($enforce) {
$this->queryBuilder->rightJoin(
$this->fileTableAlias,
IndexRequestService::TABLE_METADATA_INDEX,
$aliasIndex,
$andX
);
} else {
$this->queryBuilder->leftJoin(
$this->fileTableAlias,
IndexRequestService::TABLE_METADATA_INDEX,
$aliasIndex,
$andX
);
}
return $aliasIndex;
}
/**
* @throws FilesMetadataNotFoundException
*/
public function joinedTableAlias(string $metadataKey): string {
if (!array_key_exists($metadataKey, $this->knownJoinedIndex)) {
throw new FilesMetadataNotFoundException('table related to ' . $metadataKey . ' not initiated, you need to use leftJoin() first.');
}
return $this->knownJoinedIndex[$metadataKey];
}
/**
* @inheritDoc
*
* @param string $metadataKey metadata key
*
* @return string table field
* @throws FilesMetadataNotFoundException
* @since 28.0.0
*/
public function getMetadataKeyField(string $metadataKey): string {
return $this->joinedTableAlias($metadataKey) . '.meta_key';
}
/**
* @inheritDoc
*
* @param string $metadataKey metadata key
*
* @return string table field
* @throws FilesMetadataNotFoundException if metadataKey is not known
* @throws FilesMetadataTypeException is metadataKey is not set as indexed
* @since 28.0.0
*/
public function getMetadataValueField(string $metadataKey): string {
return match ($this->knownMetadata->getType($metadataKey)) {
IMetadataValueWrapper::TYPE_STRING => $this->joinedTableAlias($metadataKey) . '.meta_value_string',
IMetadataValueWrapper::TYPE_INT, IMetadataValueWrapper::TYPE_BOOL => $this->joinedTableAlias($metadataKey) . '.meta_value_int',
default => throw new FilesMetadataTypeException('metadata is not set as indexed'),
};
}
}
|
