Method removeFiles

/**
 * Method to parse through a files element of the installation manifest and remove
 * the files that were installed
 *
 * @param   object   $element  The XML node to process
 * @param   integer  $cid      Application ID of application to remove from
 *
 * @return  boolean  True on success
 *
 * @since   3.1
 */
public function removeFiles($element, $cid = 0)
{
    if (!$element || !\count($element->children())) {
        // Either the tag does not exist or has no children therefore we return zero files processed.
        return true;
    }
    $retval = true;
    // Get the client info if we're using a specific client
    if ($cid > -1) {
        $client = ApplicationHelper::getClientInfo($cid);
    } else {
        $client = null;
    }
    // Get the array of file nodes to process
    $files = $element->children();
    if (\count($files) === 0) {
        // No files to process
        return true;
    }
    $folder = '';
    /*
     * Here we set the folder we are going to remove the files from.  There are a few
     * special cases that need to be considered for certain reserved tags.
     */
    switch ($element->getName()) {
        case 'media':
            if ((string) $element->attributes()->destination) {
                $folder = (string) $element->attributes()->destination;
            } else {
                $folder = '';
            }
            $source = $client->path . '/media/' . $folder;
            break;
        case 'languages':
            $lang_client = (string) $element->attributes()->client;
            if ($lang_client) {
                $client = ApplicationHelper::getClientInfo($lang_client, true);
                $source = $client->path . '/language';
            } else {
                if ($client) {
                    $source = $client->path . '/language';
                } else {
                    $source = '';
                }
            }
            break;
        default:
            if ($client) {
                $pathname = 'extension_' . $client->name;
                $source = $this->getPath($pathname);
            } else {
                $pathname = 'extension_root';
                $source = $this->getPath($pathname);
            }
            break;
    }
    // Process each file in the $files array (children of $tagName).
    foreach ($files as $file) {
        /*
         * If the file is a language, we must handle it differently.  Language files
         * go in a subdirectory based on the language code, ie.
         * <language tag="en_US">en_US.mycomponent.ini</language>
         * would go in the en_US subdirectory of the languages directory.
         */
        if ($file->getName() === 'language' && (string) $file->attributes()->tag !== '') {
            if ($source) {
                $path = $source . '/' . $file->attributes()->tag . '/' . basename((string) $file);
            } else {
                $target_client = ApplicationHelper::getClientInfo((string) $file->attributes()->client, true);
                $path = $target_client->path . '/language/' . $file->attributes()->tag . '/' . basename((string) $file);
            }
            // If the language folder is not present, then the core pack hasn't been installed... ignore
            if (!Folder::exists(\dirname($path))) {
                continue;
            }
        } else {
            $path = $source . '/' . $file;
        }
        // Actually delete the files/folders
        if (is_dir($path)) {
            $val = Folder::delete($path);
        } else {
            $val = File::delete($path);
        }
        if ($val === false) {
            Log::add('Failed to delete ' . $path, Log::WARNING, 'jerror');
            $retval = false;
        }
    }
    if (!empty($folder)) {
        Folder::delete($source);
    }
    return $retval;
}