00001 package com.ohrasys.cad.bnf.validator;
00002 import java.util.*;
00003 public class ValidatorUtils {
00004 public static List flattenList(List tokens){
00005 if((tokens == null)||(tokens.size() == 0)) return new ArrayList<Object>();
00006 return recursiveFlatten(new ArrayList<Object>(), tokens);
00007 }
00008
00009 private static List<Object> recursiveFlatten(List<Object> result, Object token){
00010 if(token instanceof List) {
00011 for(int i = 0; i < ((List)token).size(); i++){
00012 recursiveFlatten(result, ((List)token).get(i));
00013 }
00014 } else {
00015 result.add(token);
00016 }
00017 return result;
00018 }
00019
00020 }
