Re: Hashes (in general)

You can make sure to use BeansWrapper instead of either  
SimpleObjectWrapper or DefaultObjectWrapper. Then, use the syntax  
map(key) instead of map[key] or map.keyStr, where you can pass  
arbitrary non-string keys. If "key" evaluates to a wrapped Java  
object, the lookup will be performed using the unwrapped Java object,  
as expected. The ability to use the function syntax map(key) on  
wrapped Java Maps is a specialty of the  BeansWrapper.

Attila.

On 2009.06.08., at 22:57, Brian Pontarelli wrote:

> I've been using FM for a while now and I just ran into a interesting
> snag. I knew that Hashes define in the FTL files had to have a String
> for the key. This seems like it is to support the 'foo.bar' syntax
> (which I'm a huge advocate against). However, I'm using JCatapult,
> which takes properties and fields of an action class and puts them
> into the root FM context. I have this:
>
> public class Foo {
>   public Map<Integer, String> guests;
>   public Map<Integer, String> miles;
>
>   public void setupForm() {
>     guests.put(1, "1");
>     ...
>   }
> }
>
> This Map is then being passed to a custom Directive as an attribute
> like this:
>
> [@jc.select items=guests name="q.guests"/]
>
> There are a few issues I'm running into.
>
> 1. FM seems to wrap this Map and rather than converting the keys to
> Strings during wrapping, it keeps the original map around and seems to
> incorrectly duplicate the keys with String versions whose values are
> all null.
>
> 2. I get random ConcurrentModificationExceptions out of FM if I use an
> iterator like this:
>
>    for (Map.Entry e : map) {
>      ...
>    }
>
> So, my questions are:
>
> - Will 2.4 or some other version will support Maps with any type of
> key so that frameworks can use Object comparisons (via the equals
> method)?
>
> - Is there a way currently to get FM to stop wrapping the Map with an
> incorrect version that has String keys and null values?
>
> Thanks,
> -bp





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