public FileSystemTraverser(final URL url, final String rootPackage, final String rootDir) {
            this(URLUtil.toFile(url), rootPackage, rootDir);
        }

        @Override
        public boolean isExistClass(final String className) {
            final File file = new File(baseDir, toClassFile(ClassUtil.concatName(rootPackage, className)));
            return file.exists();
        }

        @Override