owncloud/core — pull request #11178 by LukasReschke (2014-09-19 11:27:05+00:00)
Title: Throw error in showPreview instead the constructor

This function is also used in a way such as:

```
$preview = new \OC\Preview(\OC_User::getUser(), 'files');
$info = \OC\Files\Filesystem::getFileInfo($file);
if (!$always and !$preview->isAvailable($info)) {
\OC_Response::setStatus(404);
} else {
$preview->setFile($file);
$preview->setMaxX($maxX);
$preview->setMaxY($maxY);
$preview->setScalingUp($scalingUp);
$preview->setKeepAspect($keepAspect);
}
```

Which won't work anymore since `setFile` is used instead of passing the file in the constructor. Fixes a regression in master.

@PVince81 @th3fallen