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<?php
/**
* This class handles the representation of a file on the filesystem within the framework.
* Most of the methods also handle the {@link Folder} subclass.
*
* Note: The files are stored in the assets/ directory, but sapphire
* looks at the db object to gather information about a file such as URL
* It then uses this for all processing functions (like image manipulation).
*
* <b>Security</b>
*
* Caution: It is recommended to disable any script execution in the "assets/"
* directory in the webserver configuration, to reduce the risk of exploits.
* See http://doc.silverstripe.org/secure-development#filesystem
*
* <b>Properties</b>
*
* - "Name": File name (including extension) or folder name.
* Should be the same as the actual filesystem.
* - "Title": Optional title of the file (for display purposes only).
* Defaults to "Name". Note that the Title field of Folder (subclass of File)
* is linked to Name, so Name and Title will always be the same.
* - "Filename": Path of the file or folder, relative to the webroot.
* Usually starts with the "assets/" directory, and has no trailing slash.
* Defaults to the "assets/" directory plus "Name" property if not set.
* Setting the "Filename" property will override the "Name" property.
* The value should be in sync with "ParentID".
* - "Content": Typically unused, but handy for a textual representation of
* files, e.g. for fulltext indexing of PDF documents.
* - "ParentID": Points to a {@link Folder} record. Should be in sync with
* "Filename". A ParentID=0 value points to the "assets/" folder, not the webroot.
*
* <b>Synchronization</b>
*
* Changes to a File database record can change the filesystem entry,
* but not the other way around. If the filesystem path is renamed outside
* of SilverStripe, there's no way for the database to recover this linkage.
* New physical files on the filesystem can be "discovered" via {@link Filesystem::sync()},
* the equivalent {@link File} and {@link Folder} records are automatically
* created by this method.
*
* Certain property changes within the File API that can cause a "delayed" filesystem change:
* The change is enforced in {@link onBeforeWrite()} later on.
* - setParentID()
* - setFilename()
* - setName()
* It is recommended that you use {@link write()} directly after setting any of these properties,
* otherwise getters like {@link getFullPath()} and {@link getRelativePath()}
* will result paths that are inconsistent with the filesystem.
*
* Caution: Calling {@link delete()} will also delete from the filesystem.
* Call {@link deleteDatabaseOnly()} if you want to avoid this.
*
* <b>Creating Files and Folders</b>
*
* Typically both files and folders should be created first on the filesystem,
* and then reflected in as database records. Folders can be created recursively
* from sapphire both in the database and filesystem through {@link Folder::findOrMake()}.
* Ensure that you always set a "Filename" property when writing to the database,
* leaving it out can lead to unexpected results.
*
* @package sapphire
* @subpackage filesystem
*/
class File extends DataObject {
static $default_sort = "\"Name\"";
static $singular_name = "File";
static $plural_name = "Files";
static $db = array(
"Name" => "Varchar(255)",
"Title" => "Varchar(255)",
"Filename" => "Text",
"Content" => "Text",
"Sort" => "Int",
// Only applies to files, doesn't inherit for folder
'ShowInSearch' => 'Boolean(1)',
);
static $has_one = array(
"Parent" => "File",
"Owner" => "Member"
);
static $has_many = array();
static $many_many = array();
static $defaults = array(
"ShowInSearch" => 1,
);
static $extensions = array(
"Hierarchy",
);
/**
* @var array List of allowed file extensions, enforced through {@link validate()}.
*
* Note: if you modify this, you should also change a configuration file in the assets directory.
* Otherwise, the files will be able to be uploaded but they won't be able to be served by the
* webserver.
*
* - If you are running Apahce you will need to change assets/.htaccess
* - If you are running IIS you will need to change assets/web.config
*
* Instructions for the change you need to make are included in a comment in the config file.
*/
public static $allowed_extensions = array(
'','html','htm','xhtml','js','css',
'bmp','png','gif','jpg','jpeg','ico','pcx','tif','tiff',
'au','mid','midi','mpa','mp3','ogg','m4a','ra','wma','wav','cda',
'avi','mpg','mpeg','asf','wmv','m4v','mov','mkv','mp4','swf','flv','ram','rm',
'doc','docx','txt','rtf','xls','xlsx','pages',
'ppt','pptx','pps','csv',
'cab','arj','tar','zip','zipx','sit','sitx','gz','tgz','bz2','ace','arc','pkg','dmg','hqx','jar',
'xml','pdf',
);
/**
* @var If this is true, then restrictions set in {@link $allowed_max_file_size} and
* {@link $allowed_extensions} will be applied to users with admin privileges as
* well.
*/
public static $apply_restrictions_to_admin = true;
/**
* Cached result of a "SHOW FIELDS" call
* in instance_get() for performance reasons.
*
* @var array
*/
protected static $cache_file_fields = null;
/**
* Find a File object by the given filename.
*
* @param String $filename Matched against the "Name" property.
* @return mixed null if not found, File object of found file
*/
static function find($filename) {
// Get the base file if $filename points to a resampled file
$filename = ereg_replace('_resampled/[^-]+-','',$filename);
// Split to folders and the actual filename, and traverse the structure.
$parts = explode("/", $filename);
$parentID = 0;
$item = null;
foreach($parts as $part) {
if($part == ASSETS_DIR && !$parentID) continue;
$SQL_part = Convert::raw2sql($part);
$item = DataObject::get_one("File", "\"Name\" = '$SQL_part' AND \"ParentID\" = $parentID");
if(!$item) break;
$parentID = $item->ID;
}
return $item;
}
function Link() {
return Director::baseURL() . $this->RelativeLink();
}
function RelativeLink(){
return $this->Filename;
}
/**
* @deprecated 3.0 Use getTreeTitle()
*/
function TreeTitle() {
return $this->getTreeTitle();
}
/**
* @return string
*/
function getTreeTitle() {
return $this->Title;
}
/**
* Event handler called before deleting from the database.
* You can overload this to clean up or otherwise process data before delete this
* record. Don't forget to call {@link parent::onBeforeDelete()}, though!
*/
protected function onBeforeDelete() {
parent::onBeforeDelete();
// ensure that the record is synced with the filesystem before deleting
$this->updateFilesystem();
if($this->Filename && $this->Name && file_exists($this->getFullPath()) && !is_dir($this->getFullPath())) {
unlink($this->getFullPath());
}
}
/**
* @todo Enforce on filesystem URL level via mod_rewrite
*
* @return boolean
*/
function canView($member = null) {
if(!$member) $member = Member::currentUser();
$results = $this->extend('canView', $member);
if($results && is_array($results)) if(!min($results)) return false;
return true;
}
/**
* Returns true if the following conditions are met:
* - CMS_ACCESS_AssetAdmin
*
* @todo Decouple from CMS view access
*
* @return boolean
*/
function canEdit($member = null) {
if(!$member) $member = Member::currentUser();
$result = $this->extendedCan('canEdit', $member);
if($result !== null) return $result;
return Permission::checkMember($member, 'CMS_ACCESS_AssetAdmin');
}
/**
* @return boolean
*/
function canCreate($member = null) {
if(!$member) $member = Member::currentUser();
$result = $this->extendedCan('canCreate', $member);
if($result !== null) return $result;
return $this->canEdit($member);
}
/**
* @return boolean
*/
function canDelete($member = null) {
if(!$member) $member = Member::currentUser();
$results = $this->extend('canDelete', $member);
if($results && is_array($results)) if(!min($results)) return false;
return $this->canEdit($member);
}
/**
* Returns a category based on the file extension.
* This can be useful when grouping files by type,
* showing icons on filelinks, etc.
* Possible group values are: "audio", "mov", "zip", "image".
*
* @return String
*/
public function appCategory() {
$ext = strtolower($this->Extension);
switch($ext) {
case "aif": case "au": case "mid": case "midi": case "mp3": case "ra": case "ram": case "rm":
case "mp3": case "wav": case "m4a": case "snd": case "aifc": case "aiff": case "wma": case "apl":
case "avr": case "cda": case "mp4": case "ogg":
return "audio";
case "mpeg": case "mpg": case "m1v": case "mp2": case "mpa": case "mpe": case "ifo": case "vob":
case "avi": case "wmv": case "asf": case "m2v": case "qt":
return "mov";
case "arc": case "rar": case "tar": case "gz": case "tgz": case "bz2": case "dmg": case "jar":
case "ace": case "arj": case "bz": case "cab":
return "zip";
case "bmp": case "gif": case "jpg": case "jpeg": case "pcx": case "tif": case "png": case "alpha":
case "als": case "cel": case "icon": case "ico": case "ps":
return "image";
}
}
function CMSThumbnail() {
$filename = $this->Icon();
return "<div style=\"text-align:center;width: 100px;padding-top: 15px;\"><a target=\"_blank\" href=\"$this->URL\" title=\"Download: $this->URL\"><img src=\"$filename\" alt=\"$filename\" /></a><br /><br /><a style=\"color: #0074C6;\"target=\"_blank\" href=\"$this->URL\" title=\"Download: $this->URL\">Download</a><br /><em>$this->Size</em></div>";
}
/**
* Return the relative URL of an icon for the file type,
* based on the {@link appCategory()} value.
* Images are searched for in "sapphire/images/app_icons/".
*
* @return String
*/
function Icon() {
$ext = $this->Extension;
if(!Director::fileExists(SAPPHIRE_DIR . "/images/app_icons/{$ext}_32.gif")) {
$ext = $this->appCategory();
}
if(!Director::fileExists(SAPPHIRE_DIR . "/images/app_icons/{$ext}_32.gif")) {
$ext = "generic";
}
return SAPPHIRE_DIR . "/images/app_icons/{$ext}_32.gif";
}
/**
* Should be called after the file was uploaded
*/
function onAfterUpload() {
$this->extend('onAfterUpload');
}
/**
* Delete the database record (recursively for folders) without touching the filesystem
*/
public function deleteDatabaseOnly() {
if(is_numeric($this->ID)) DB::query("DELETE FROM \"File\" WHERE \"ID\" = $this->ID");
}
/**
* Make sure the file has a name
*/
protected function onBeforeWrite() {
parent::onBeforeWrite();
// Set default name
if(!$this->getField('Name')) $this->Name = "new-" . strtolower($this->class);
}
/**
* Set name on filesystem. If the current object is a "Folder", will also update references
* to subfolders and contained file records (both in database and filesystem)
*/
protected function onAfterWrite() {
parent::onAfterWrite();
$this->updateFilesystem();
}
/**
* Moving the file if appropriate according to updated database content.
* Throws an Exception if the new file already exists.
*
* Caution: This method should just be called during a {@link write()} invocation,
* as it relies on {@link DataObject->isChanged()}, which is reset after a {@link write()} call.
* Might be called as {@link File->updateFilesystem()} from within {@link Folder->updateFilesystem()},
* so it has to handle both files and folders.
*
* Assumes that the "Filename" property was previously updated, either directly or indirectly.
* (it might have been influenced by {@link setName()} or {@link setParentID()} before).
*/
public function updateFilesystem() {
// Regenerate "Filename", just to be sure
$this->setField('Filename', $this->getRelativePath());
// If certain elements are changed, update the filesystem reference
if(!$this->isChanged('Filename')) return false;
$changedFields = $this->getChangedFields();
$pathBefore = $changedFields['Filename']['before'];
$pathAfter = $changedFields['Filename']['after'];
// If the file or folder didn't exist before, don't rename - its created
if(!$pathBefore) return;
$pathBeforeAbs = Director::getAbsFile($pathBefore);
$pathAfterAbs = Director::getAbsFile($pathAfter);
// TODO Fix Filetest->testCreateWithFilenameWithSubfolder() to enable this
// // Create parent folders recursively in database and filesystem
// if(!is_a($this, 'Folder')) {
// $folder = Folder::findOrMake(dirname($pathAfterAbs));
// if($folder) $this->ParentID = $folder->ID;
// }
// Check that original file or folder exists, and rename on filesystem if required.
// The folder of the path might've already been renamed by Folder->updateFilesystem()
// before any filesystem update on contained file or subfolder records is triggered.
if(!file_exists($pathAfterAbs)) {
if(!is_a($this, 'Folder')) {
// Only throw a fatal error if *both* before and after paths don't exist.
if(!file_exists($pathBeforeAbs)) throw new Exception("Cannot move $pathBefore to $pathAfter - $pathBefore doesn't exist");
// Check that target directory (not the file itself) exists.
// Only check if we're dealing with a file, otherwise the folder will need to be created
if(!file_exists(dirname($pathAfterAbs))) throw new Exception("Cannot move $pathBefore to $pathAfter - Directory " . dirname($pathAfter) . " doesn't exist");
}
// Rename file or folder
$success = rename($pathBeforeAbs, $pathAfterAbs);
if(!$success) throw new Exception("Cannot move $pathBeforeAbs to $pathAfterAbs");
}
// Update any database references
$this->updateLinks($pathBefore, $pathAfter);
}
/**
* Collate selected descendants of this page.
* $condition will be evaluated on each descendant, and if it is succeeds, that item will be added
* to the $collator array.
* @param condition The PHP condition to be evaluated. The page will be called $item
* @param collator An array, passed by reference, to collect all of the matching descendants.
*/
public function collateDescendants($condition, &$collator) {
if($children = $this->Children()) {
foreach($children as $item) {
if(!$condition || eval("return $condition;")) $collator[] = $item;
$item->collateDescendants($condition, $collator);
}
return true;
}
}
/**
* Setter function for Name. Automatically sets a default title,
* and removes characters that might be invalid on the filesystem.
* Also adds a suffix to the name if the filename already exists
* on the filesystem, and is associated to a different {@link File} database record
* in the same folder. This means "myfile.jpg" might become "myfile-1.jpg".
*
* Does not change the filesystem itself, please use {@link write()} for this.
*
* @param String $name
*/
function setName($name) {
$oldName = $this->Name;
// It can't be blank, default to Title
if(!$name) $name = $this->Title;
// Fix illegal characters
$filter = Object::create('FileNameFilter');
$name = $filter->filter($name);
// We might have just turned it blank, so check again.
if(!$name) $name = 'new-folder';
// If it's changed, check for duplicates
if($oldName && $oldName != $name) {
$base = pathinfo($name, PATHINFO_BASENAME);
$ext = self::get_file_extension($name);
$suffix = 1;
while(DataObject::get_one("File", "\"Name\" = '" . Convert::raw2sql($name) . "' AND \"ParentID\" = " . (int)$this->ParentID)) {
$suffix++;
$name = "$base-$suffix$ext";
}
}
// Update title
if(!$this->getField('Title')) $this->__set('Title', str_replace(array('-','_'),' ',ereg_replace('\.[^.]+$','',$name)));
// Update actual field value
$this->setField('Name', $name);
// Ensure that the filename is updated as well (only in-memory)
// Important: Circumvent the getter to avoid infinite loops
$this->setField('Filename', $this->getRelativePath());
return $this->getField('Name');
}
/**
* @param String $old File path relative to the webroot
* @param String $new File path relative to the webroot
*/
protected function updateLinks($old, $new) {
$this->extend('updateLinks', $old, $new);
}
/**
* Does not change the filesystem itself, please use {@link write()} for this.
*/
function setParentID($parentID) {
$this->setField('ParentID', (int)$parentID);
// Don't change on the filesystem, we'll handle that in onBeforeWrite()
$this->setField('Filename', $this->getRelativePath());
return $this->getField('ParentID');
}
/**
* Gets the absolute URL accessible through the web.
*
* @uses Director::absoluteBaseURL()
* @return string
*/
function getAbsoluteURL() {
return Director::absoluteBaseURL() . $this->getFilename();
}
/**
* Gets the relative URL accessible through the web.
*
* @uses Director::baseURL()
* @return string
*/
function getURL() {
return Director::baseURL() . $this->getFilename();
}
/**
* Return the last 50 characters of the URL.
*
* @deprecated 2.4
*/
function getLinkedURL() {
return "$this->Name";
}
/**
* Returns an absolute filesystem path to the file.
* Use {@link getRelativePath()} to get the same path relative to the webroot.
*
* @return String
*/
function getFullPath() {
$baseFolder = Director::baseFolder();
if(strpos($this->getFilename(), $baseFolder) === 0) {
// if path is absolute already, just return
return $this->getFilename();
} else {
// otherwise assume silverstripe-basefolder
return Director::baseFolder() . '/' . $this->getFilename();
}
}
/**
* Returns path relative to webroot.
* Serves as a "fallback" method to create the "Filename" property if it isn't set.
* If no {@link Folder} is set ("ParentID" property),
* defaults to a filename relative to the ASSETS_DIR (usually "assets/").
*
* @return String
*/
function getRelativePath() {
if($this->ParentID) {
$p = DataObject::get_by_id('Folder', $this->ParentID, false); // Don't use the cache, the parent has just been changed
if($p && $p->exists()) return $p->getRelativePath() . $this->getField("Name");
else return ASSETS_DIR . "/" . $this->getField("Name");
} else if($this->getField("Name")) {
return ASSETS_DIR . "/" . $this->getField("Name");
} else {
return ASSETS_DIR;
}
}
/**
* @todo Coupling with cms module, remove this method.
*/
function DeleteLink() {
return Director::absoluteBaseURL()."admin/assets/removefile/".$this->ID;
}
function getFilename() {
// Default behaviour: Return field if its set
if($this->getField('Filename')) {
return $this->getField('Filename');
} else {
return ASSETS_DIR . '/';
}
}
/**
* Does not change the filesystem itself, please use {@link write()} for this.
*/
function setFilename($val) {
$this->setField('Filename', $val);
// "Filename" is the "master record" (existing on the filesystem),
// meaning we have to adjust the "Name" property in the database as well.
$this->setField('Name', basename($val));
}
/**
* Returns the file extension
*
* @todo This overrides getExtension() in DataObject, but it does something completely different.
* This should be renamed to getFileExtension(), but has not been yet as it may break
* legacy code.
*
* @return String
*/
function getExtension() {
return self::get_file_extension($this->getField('Filename'));
}
/**
* Gets the extension of a filepath or filename,
* by stripping away everything before the last "dot".
* Caution: Only returns the last extension in "double-barrelled"
* extensions (e.g. "gz" for "tar.gz").
*
* Examples:
* - "myfile" returns ""
* - "myfile.txt" returns "txt"
* - "myfile.tar.gz" returns "gz"
*
* @param string $filename
* @return string
*/
public static function get_file_extension($filename) {
return pathinfo($filename, PATHINFO_EXTENSION);
}
/**
* Return the type of file for the given extension
* on the current file name.
*
* @return string
*/
function getFileType() {
$types = array(
'gif' => 'GIF image - good for diagrams',
'jpg' => 'JPEG image - good for photos',
'jpeg' => 'JPEG image - good for photos',
'png' => 'PNG image - good general-purpose format',
'ico' => 'Icon image',
'tiff' => 'Tagged image format',
'doc' => 'Word document',
'xls' => 'Excel spreadsheet',
'zip' => 'ZIP compressed file',
'gz' => 'GZIP compressed file',
'dmg' => 'Apple disk image',
'pdf' => 'Adobe Acrobat PDF file',
'mp3' => 'MP3 audio file',
'wav' => 'WAV audo file',
'avi' => 'AVI video file',
'mpg' => 'MPEG video file',
'mpeg' => 'MPEG video file',
'js' => 'Javascript file',
'css' => 'CSS file',
'html' => 'HTML file',
'htm' => 'HTML file'
);
$ext = $this->getExtension();
return isset($types[$ext]) ? $types[$ext] : 'unknown';
}
/**
* Returns the size of the file type in an appropriate format.
*/
function getSize() {
$size = $this->getAbsoluteSize();
return ($size) ? self::format_size($size) : false;
}
public static function format_size($size) {
if($size < 1024) return $size . ' bytes';
if($size < 1024*10) return (round($size/1024*10)/10). ' KB';
if($size < 1024*1024) return round($size/1024) . ' KB';
if($size < 1024*1024*10) return (round(($size/1024)/1024*10)/10) . ' MB';
if($size < 1024*1024*1024) return round(($size/1024)/1024) . ' MB';
return round($size/(1024*1024*1024)*10)/10 . ' GB';
}
/**
* Return file size in bytes.
* @return int
*/
function getAbsoluteSize(){
if(file_exists($this->getFullPath())) {
$size = filesize($this->getFullPath());
return $size;
} else {
return 0;
}
}
/**
* We've overridden the DataObject::get function for File so that the very large content field
* is excluded!
*
* @todo Admittedly this is a bit of a hack; but we need a way of ensuring that large
* TEXT fields don't stuff things up for the rest of us. Perhaps a separate search table would
* be a better way of approaching this?
* @deprecated alternative_instance_get()
*/
public function instance_get($filter = "", $sort = "", $join = "", $limit="", $containerClass = "DataObjectSet", $having="") {
$query = $this->extendedSQL($filter, $sort, $limit, $join, $having);
$baseTable = reset($query->from);
$excludeDbColumns = array('Content');
// Work out which columns we're actually going to select
// In short, we select everything except File.Content
$dataobject_select = array();
foreach($query->select as $item) {
/*
if($item == "\"File\".*") {
$fileColumns = DB::query("SHOW FIELDS IN \"File\"")->column();
$columnsToAdd = array_diff($fileColumns, $excludeDbColumns);
foreach($columnsToAdd as $otherItem) $dataobject_select[] = '"File".' . $otherItem;
} else {
*/
$dataobject_select[] = $item;
//}
}
$query->select = $dataobject_select;
$records = $query->execute();
$ret = $this->buildDataObjectSet($records, $containerClass);
return $ret;
}
public function flushCache() {
parent::flushCache();
self::$cache_file_fields = null;
}
/**
*
* @param boolean $includerelations a boolean value to indicate if the labels returned include relation fields
*
*/
function fieldLabels($includerelations = true) {
$labels = parent::fieldLabels($includerelations);
$labels['Name'] = _t('File.Name', 'Name');
$labels['Title'] = _t('File.Title', 'Title');
$labels['Filename'] = _t('File.Filename', 'Filename');
$labels['Filename'] = _t('File.Filename', 'Filename');
$labels['Content'] = _t('File.Content', 'Content');
$labels['Sort'] = _t('File.Sort', 'Sort Order');
return $labels;
}
function validate() {
if(File::$apply_restrictions_to_admin || !Permission::check('ADMIN')) {
// Extension validation
// TODO Merge this with Upload_Validator
$extension = $this->getExtension();
$allowed = array_map('strtolower', self::$allowed_extensions);
if($extension && !in_array(strtolower($extension), $allowed)) {
$exts = $allowed;
sort($exts);
$message = sprintf(
_t(
'File.INVALIDEXTENSION',
'Extension is not allowed (valid: %s)',
PR_MEDIUM,
'Argument 1: Comma-separated list of valid extensions'
),
wordwrap(implode(', ',$exts))
);
return new ValidationResult(false, $message);
}
}
// We aren't validating for an existing "Filename" on the filesystem.
// A record should still be saveable even if the underlying record has been removed.
return new ValidationResult(true);
}
/**
* Allow custom fields for uploads in {@link AssetAdmin}.
* Similar to {@link getCMSFields()}, but a more restricted
* set of fields which can be reliably set on any file type.
*
* Needs to be enabled through {@link AssetAdmin::$metadata_upload_enabled}
*
* @return FieldList
*/
function uploadMetadataFields() {
$fields = new FieldList();
$fields->push(new TextField('Title', $this->fieldLabel('Title')));
$this->extend('updateUploadMetadataFields', $fields);
return $fields;
}
/**
* @var Array Only use lowercase extensions in here.
*/
static $class_for_file_extension = array(
'*' => 'File',
'jpg' => 'Image',
'jpeg' => 'Image',
'png' => 'Image',
'gif' => 'Image',
);
/**
* Maps a {@link File} subclass to a specific extension.
* By default, files with common image extensions will be created
* as {@link Image} instead of {@link File} when using
* {@link Folder::constructChild}, {@link Folder::addUploadToFolder}),
* and the {@link Upload} class (either directly or through {@link FileField}).
* For manually instanciated files please use this mapping getter.
*
* Caution: Changes to mapping doesn't apply to existing file records in the database.
* Also doesn't hook into {@link Object::getCustomClass()}.
*
* @param String File extension, without dot prefix. Use an asterisk ('*')
* to specify a generic fallback if no mapping is found for an extension.
* @return String Classname for a subclass of {@link File}
*/
static function get_class_for_file_extension($ext) {
$map = array_change_key_case(self::$class_for_file_extension, CASE_LOWER);
return (array_key_exists(strtolower($ext), $map)) ? $map[strtolower($ext)] : $map['*'];
}
/**
* See {@link get_class_for_file_extension()}.
*
* @param String|array
* @param String
*/
static function set_class_for_file_extension($exts, $class) {
if(!is_array($exts)) $exts = array($exts);
foreach($exts as $ext) {
if(ClassInfo::is_subclass_of($ext, 'File')) {
throw new InvalidArgumentException(
sprintf('Class "%s" (for extension "%s") is not a valid subclass of File', $class, $ext)
);
}
self::$class_for_file_extension[$ext] = $class;
}
}
}
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