Logger log = (Logger) loggerMap.get (f);
Logger log = null; if (loggerMap != null) log = (Logger) loggerMap.get (f);
    public static synchronized Logger getLogger (String dirname, String filename) throws IOException {	File f = new File (dirname, filename);	Logger log = (Logger) loggerMap.get (f);	if (log == null)	    log = new Logger (dirname, filename);	return log;    }