FileLogger class

class FileLogger extends DelegateLogger {

    private File file;

    public FileLogger(File file) {
       super();
       this.file = file;
    }

    public FileLogger(File file, Logger delegate) {
       super(delegate);
        this.file = file;
    }

    @Override
    public void log(String log) {
        // log to file
        this.delegateLog(log);
    }

}