question: public static boolean isFileURL ( URL url ) { String protocol = url . getProtocol ( ) ; return ( URL_PROTOCOL_FILE . equals ( protocol ) || URL_PROTOCOL_VFSFILE . equals ( protocol ) || URL_PROTOCOL_VFS . equals ( protocol ) ) ; }
target:  Determine whether the given URL points to a resource in the file system, that is, has protocol "file", "vfsfile" or "vfs".