in webindex/modules/core/src/main/java/webindex/core/models/URL.java [170:183]
public static String reverseHost(String host) {
String[] hostArgs = host.split("\\.");
ArrayUtils.reverse(hostArgs);
StringBuilder sb = new StringBuilder();
for (int i = 0; i < hostArgs.length - 1; i++) {
sb.append(hostArgs[i]);
sb.append(".");
}
sb.append(hostArgs[hostArgs.length - 1]);
if (host.endsWith(".")) {
sb.append(".");
}
return sb.toString();
}