/**
* Expand all folder aliases and return a usable URL.
* Extends the aliases registered with {@link RESOURCE_MANAGER} with support
* for {pic_thumb} and {pic_image}, which resolve to either the embedded
* image or thumbnail for a {@link PICTURE} in the album. The identifier
* following the alias can be either an ID or an image file name (e.g.
* "{pic_thumb}/1304" or "{pic_thumb}/pic_file_name.jpg").
* @param string $url
* @param boolean $root_override Overrides {@link $resolve_to_root} if set to
* {@link Force_root_on}.
* @return string
*/
public function resolve_file($url, $root_override = null)
{
$thumb_key = '{pic_thumb}';
$pic_key = '{pic_image}';
if (strpos($url, $thumb_key) !== false) {
$key = $thumb_key;
} else {
if (strpos($url, $pic_key) !== false) {
$key = $pic_key;
}
}
if (isset($key)) {
$id = substr($url, strlen($key));
if ($id && $id[0] == '/') {
$id = substr($id, 1);
}
/* Test if it can be an id. If yes, then look up the picture. If no, then assume
it's a file name and include the id as a url */
if (is_numeric($id)) {
$pic_query = $this->entry_query();
$pic_query->set_type('picture');
$pic = $pic_query->object_at_id($id);
if ($key == $thumb_key) {
$url = $pic->full_thumbnail_name();
} else {
$url = $pic->full_file_name();
}
} else {
$url = new URL($this->picture_folder_url());
$url->append($id);
if ($key == $thumb_key) {
$url->append_to_name('_tn');
}
$url = $url->as_text();
}
}
return parent::resolve_file($url, $root_override);
}
