public List<Item> dfResolve(Map<String, Item> allItems) {
      int itemCount = allItems.size();
      final List<Item> resolved = new ArrayList<Item>(itemCount);
      final Set<Item> processed = new HashSet<Item>(itemCount);
      final Set<Item> visited = new HashSet<Item>();

      for(Item item : allItems.values()) {
         resolve(item, allItems, processed, visited, resolved);
         visited.clear();
      }
      if(resolved.size() < itemCount)
         throw new RuntimeException("Unresolved dependencies");

      return resolved;
   }

   public void resolve(final Item item, final Map<String, Item> allItems, final Set<Item> processed, final Set<Item> visited, final List<Item> resolved) {
      if(visited.contains(item))
            throw new RuntimeException("Circular dependency discovered: " + visited);
      visited.add(item);

      if(!processed.contains(item)) {

         processed.add(item);
         for(String dep : item.getDependencies()) {
            Item depItem = allItems.get(dep);
            if(depItem == null)
               throw new RuntimeException("Unresolved dependency: " + item.getName() + " depends on " + dep + " which can not be found");
            resolve(depItem, allItems, processed, visited, resolved);
         }
         resolved.add(item);
      }

      visited.remove(item);
   }