code: public Collection<C> getAll(Collection<String> ids){
  		Set<C> list = new LinkedHashSet<C>();
  
  		for(String id : ids){
  			C container = get(id);
  
  			if(container != null){
  				list.add(container);
  			}
  		}
  
  		return list;
  	}
docs: Looks up a Collection of Containers by their identifiers.
  
  The returned Collection preserves the iteration order of the passed-in Collection.
  
  @return Collection of Containers.