Best practice to implement hash bang tokens in activities and places keeping @WithTokenizers

Hi,

I am currently using:

- PlaceHistoryMapper historyMapper = GWT.create(AppPlaceHistoryMapper.class);

- @WithTokenizers({FrontPlace.Tokenizer.class, ...}) on PlaceHistoryMapper

I'd like to use now hash bang tokens for places to support bot crawling. 

What is the best way (minimal change) to do this? 

I am currently using a PlaceHistoryMapper-WRAPPER that adds and understands the bang (!).

The PlaceHistoryMapper I pass to this wrapper is created through the old process (GWT.create + @WithTokenizers). I've posted the code below for clarity.

Note: I like that I can continue to use @WithTokenizers.

Is there a better way to achieve this?

I expected that there would be a flag on @WithTokenizers or another annotation to simply switch hash bang tokens, but did find no reference in the docs or the web.

Thank you.

>>

  PlaceHistoryMapper historyMapper = GWT.create(AppPlaceHistoryMapper.class);

  class PlaceHistoryMapperHashBang implements PlaceHistoryMapper {

   private PlaceHistoryMapper historyMapper;

   PlaceHistoryMapperHashBang(PlaceHistoryMapper historyMapper) {

    this.historyMapper = historyMapper;

   }

   @Override

   public Place getPlace(String token) {

    Place p=historyMapper.getPlace(token.substring(1));

    if(p!=null) return p;

    return historyMapper.getPlace(token);

   }

   @Override

   public String getToken(Place place) {

    return "!"+historyMapper.getToken(place);

   }

  }

  PlaceHistoryHandler historyHandler = new PlaceHistoryHandler(new PlaceHistoryMapperHashBang(historyMapper));

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