code: public MessageListItem from(final String category) {
  		List<String> messages = FluentIterable.from(delegate)
  			.filter(byCategory(category))
  			.transform(toMessageString())
  			.toList();
  
  		return new MessageListItem(messages);
  	}
docs: Return all messages by category. This method can useful if you want to get messages from a specific
  category.