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<?php
/**
* Helper class for representing operations with transaction support.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc.,
* 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
* http://www.gnu.org/copyleft/gpl.html
*
* @file
* @ingroup FileBackend
*/
/**
* Change metadata for a file at the given storage path in the backend.
* Parameters for this operation are outlined in FileBackend::doOperations().
*/
class DescribeFileOp extends FileOp {
protected function allowedParams() {
return [ [ 'src' ], [ 'headers' ], [ 'src' ] ];
}
protected function doPrecheck( array &$predicates ) {
$status = StatusValue::newGood();
// Check if the source file exists
if ( !$this->fileExists( $this->params['src'], $predicates ) ) {
$status->fatal( 'backend-fail-notexists', $this->params['src'] );
return $status;
// Check if a file can be placed/changed at the source
} elseif ( !$this->backend->isPathUsableInternal( $this->params['src'] ) ) {
$status->fatal( 'backend-fail-usable', $this->params['src'] );
$status->fatal( 'backend-fail-describe', $this->params['src'] );
return $status;
}
// Update file existence predicates
$predicates['exists'][$this->params['src']] =
$this->fileExists( $this->params['src'], $predicates );
$predicates['sha1'][$this->params['src']] =
$this->fileSha1( $this->params['src'], $predicates );
return $status; // safe to call attempt()
}
protected function doAttempt() {
// Update the source file's metadata
return $this->backend->describeInternal( $this->setFlags( $this->params ) );
}
public function storagePathsChanged() {
return [ $this->params['src'] ];
}
}
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