code: @Override
  	public AppEngineGetList<E> filter(Filter<?>... filters) {
  		if (filters == null) {
  			throw new IllegalArgumentException("'filters' must not be [" + null + "]");
  		}
  		
  		this.filters = Arrays.asList(filters);
  		return this;
  	}
docs: Qualifies entities to be retrieved with the specified {@code Filter}s.
  Each of the specified filters is combined with "logical and".
  
  @param filters {@code Filter}s to qualify entities to be retrieved.
  @return The {@code GetList} which the execution result is
  qualified with the specified {@code Filter}s.