this.rootDir = rootDir;
            this.zipUrl = zipUrl;
            this.prefix = prefix;
        }

        private void loadFromZip(final URL zipUrl) {
            final ZipInputStream zis = new ZipInputStream(URLUtil.openStream(zipUrl));
            try {
                ZipEntry entry = null;
                while ((entry = ZipInputStreamUtil.getNextEntry(zis)) != null) {